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64-301 - 201-205 HIGHLAND AVENUE - CONSERVATION COMMISSION �oi� VincAW%4-s P� No. 42101/3 en a g, x® ;ewe 1 10% Massachusetts Department of Environmental Protection DEP File Number: Bureau of Resource Protection - Wetlands 64-301 WPA Form 8B - Certificate of Compliance Provided by DEP Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 D. Recording Confirmation The applicant is responsible for ensuring that this Certificate of Compliance is recorded in the Registry of Deeds or the Land Court for the district in which the land is located. Detach on dotted line and submit to the Conservation Commission. To: Salem Conservation Commission Please be advised that the Certificate of Compliance for the project at: 205 Highland Avenue 64-301 Project Location DEP File Number Has been recorded at the Registry of Deeds of: Essex South District County for: Ridgeside Apartments, LLC Property Owner and has been noted in the chain of title of the affected property on: December 30 , 2003 22243 18 Date Book Page If recorded land, the instrument number which identifies this transaction is: 265 If registered land, the document number which identifies this transaction is: 431742 on Certificate of Title No. 38811 and 72694 Document Number Signature of Applicant WPA Form 8B Page 3 of 3 Rev.02/00 Massachusetts Department of Environmental Protection DEP File Number: Bureau of Resource Protection - Wetlands sa-3o1 WPA Form 8B — Certificate of Compliance Provided by DEP Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 A. Project Information Important: 1 This Certificate of Compliance is issued to: When filling out p forms on the Ridgeside Apartments, LLC. computer, use Name only the tab key to move 100 Grandview Road your cursor- Mailing Address - do not use the Braintree MA 02184 return key. Cityrrown State - zip Code .dl I I 2. This Certificate of Compliance is issued for work regulated by a final Order of Conditions issued to: Autumn Development Co., Inc. Name 217/00 64-301 Dated DEP File Number - 3. The project site is located at: 205 Highland Avenue Salem Street Address Cityrrown Map 13 Lot 4 Assessors Map/Plat Number Paroel/Lot Number the final Order of Condition was recorded at the Registry of Deeds for: Vincents Potato Chips Co. Property Owner(if different) Essex 17145& 16998 533&453 County Book Page NA Certificate - - 4. A site inspection was made in the presence of the applicant, or the applicant's agent, on: December 11, 2003 Date B. Certification Check all that apply: ® Complete Certification: It is hereby certified that the work regulated by the above-referenced Order of Conditions has been satisfactorily completed. ❑ Partial Certification: It is hereby certified that only the following portions of work regulated by the above-referenced Order of Conditions have been satisfactorily completed.The project areas or work subject to this partial certification that have been completed and are released from this Order are: WPA Form 8B - Page t of 3 Rev.02/ao Massachusetts Department of Environmental Protection DEP File Number: Bureau of Resource Protection - Wetlands WPA Form 813 — Certificate of Compliance Gil-3°t p - Provided by DEP Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Certification (cont.) ❑ Invalid Order of Conditions: It is hereby certified that the work regulated by the above- referenced Order of Conditions never commenced.The Order of Conditions has lapsed and is therefore no longer valid. No future work subject to regulation under the Wetlands Protection Act may commence without filing a new Notice of Intent and receiving a new Order of Conditions. ❑ Ongoing Conditions: The following conditions of the Order shall continue: (Include any conditions contained in the Final Order, such as maintenance or monitoring, that should continue for a longer period). Condition Numbers: C. Authorization Issued by: ¢m �¢te.rbor ti 2U Conservation Commission ate of Issuance This Certificate must be signed by a majority of the Conservation Commission and a copy sent to the applicant and a ropr to DEP Regional Office (See Appendix A). Signatures:. G On Of �eL��b¢J`. 2.x3 Day Month a nd Y before me personally appeared f�bov� Y�c.rv.�S to me known to be the person described in and who executed the foregoing instrument and acknowledged that he/she executed the sameas his/her free act and deed. Notary Pubic My co ission expires WPA Form 8B Rev.02/00 Page 2 of 3 s Massachusetts Department of Environmental Protection DEP File Number: Bureau of Resource Protection - Wetlands 64-301 WPA Form 8B — Certificate of Compliance Provided by 6EP Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 D. Recording Confirmation The applicant is responsible for ensuring that this Certificate of Compliance is recorded in the Registry of Deeds or the Land Court for the district in which the land is located. Detach on dotted line and submit to the Conservation Commission. ------------------------------------------------------------------------------------------------------------------- To: Salem Conservation Commission Please be advised that the Certificate of Compliance for the project at: 205 Highland Avenue 64-301 Project Location DEP File Number Has been recorded at the Registry of Deeds of: County for: Property Owner and has been noted in the chain of title of the affected property on: Date Book Page If recorded land, the instrument number which identifies this transaction is: If registered land, the document number which identifies this transaction is: Document Number Signature of Applicant WPA Form as Page 3 of 3 Rev.02/00 i µ l e H. W. MOO ppRE ASSOCIATES, INC. 112 SHAWMUT AVENUE �FAI?Ja /W owvwi _4 BOSTON, MASSACHUSETTS 02 1 1 8-2298 TELEPHONE(617)357-8145 FAX NO, 357-9495 November 24, 2003 City of Salem Conservation Commission City Hall Annex 120 Washington Street, P Floor Salem, Ma. 01970 R COVE�J, RE: DEP File No. 64-301 DEC 0 3 2003 Hawthorne Commons (Formerly Ridgeside Apartments) DEPT.lF I L!.fi:�li G t: 205 Highland Avenue CCMMUOYDZYKLQi i,TNT__ !! Request for a Certificate of Compliance �— Dear Commission Members: On behalf of the applicant, Ridgeside Apartments, LLC and pursuant to the above referenced Orders of Conditions, we have enclosed the following items: 1. Two (2) copies of the"As-Built Plan" for Hawthorne Commons. 2. Two (2) copies of the"Plan of Land" for Hawthorne Commons. 3. Request for Certificate of Compliance(WPA Form 8A). 4. Copy of the Orders of Conditions issued 1/27/00 and amended 2/8/01. Based on periodic inspections by this office and the enclosed as-built plan dated July 31, 2002 (revised November 21, 2003) prepared by Hayes Engineering, Inc. (land surveyors), we certify to the best of our knowledge and belief that the site improvements were constructed in general conformance with the Notice of Intent, the approved plans and the Orders of Conditions. The following items appear to be minor deviations noted between the constructed site and that of the approved site plans: 1. The addition of a drain manhole near the end of the 18-inch diameter drainline located between the rear site retaining wall and the rear of the pool area. This additional manhole allowed the last section of drainpipe to be installed perpendicular to the wall at the point of discharge. 2. A 12-inch diameter drainpipe was installed in place of an 18-inch diameter drainpipe to connect the drain manhole in the sidewalk on First Street to the drain manhole in the parking lot near the site clubhouse. This section of pipe will be replaced with a larger pipe as part of the proposed Hawthorne Commons II project located opposite the site across First Street. 3. A chain link fence was installed in place of a stone/boulder line to delineate the limits of the No Cut/No Disturbance area bordering the existing intermittent stream. 1845-CwC.,,T] u-112.4-03.d.c Request for Certificate of Compliance November 24,2003 Hawthorne Commons page 2 Other than these minor deviations, we certify that the site has been constructed in accordance with the approved site plans. Should you have any comments concerning this submittal please do not hesitate to contact us. Very truly yours H.W. MOOORE ASSOCIATES, INC. Todd N. Undzis, P.E. Design Engineer OF IV, Cc: Tom Albert, John M. Corcoran Co. N_ TCDD N. G 1t Joe Correnti uNDzls CIVIL i O:RLwi+T H.1845-CenCor�Ii IQ4-0 li.W.MOOROHE ASSOCIATES, INC. -CONSULTING ENGINEERS •BOS1'ON, MASSACHUSETTS 02118 DEP File Number: Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands 64-301 z� WPA Form 5 - Order of Conditions Provided by DEP Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 A. General Information Important: From: When filling out forms on Salem the computer, Conservation Commission use only the tab key to This issuance if for (check one): move your cursor-do ❑ Order of Conditions not use the return key. ® Amended Order of Conditions To: Applicant: Property Owner(if different from applicant): Ridgeside Apartments,LLC c/o Thomas K. Albert Same Name Name 100 Grandview Road, Suite 203 Mailing Address Mailing Address Braintree - MA 02184 City/Town State Zip Code Cityrrown State Zip Code 1. Project Location: 201-205 Highland Avenue Salem Street Address - City/Town Map 13 Lot 4 Assessors Map/Plat Number Parcel/Lot Number 2. Property recorded at the Registry of Deeds for: Essex 7824, 7897, 20893 &4544 Page 350, 391, County Book 437 &437 20893 & 388111 Certificate(if registered land) 3. Dates: Amended February 8, 2001 December 30, 1999 January 27, 2000 January 27, 2000 Date Notice of Intent Filed Date Public Hearing Closed Date of Issuance 4. Final Approved Plans and Other Documents (attach additional plan references as needed): See Attached Title Dale 5. Final Plans and Documents Signed and Stamped by: Name 6. Total Fee: 1,575 (from Appendix B:Wetland Fee Transmittal Form) WPA Forth 5 Page 1 of Rev.02/00 Massachusetts Department of Environmental Protection DEP File Number: Bureau of Resource Protection - Wetlands 64-301 WPA Form 5 - Order of Conditions Provided by DEP Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Findings Findings pursuant to the Massachusetts Wetlands Protection Act: Following the review of the above-referenced Notice of Intent and based on the information provided in this application and presented at the public hearing,this Commission finds that the areas in which work is proposed is significant to the following interests of the Wetlands Protection Act. Check all that apply: ❑ Public Water Supply ❑ Land Containing Shellfish ® Prevention of Pollution ❑ Private Water Supply ❑ Fisheries ® Protection of Wildlife Habitat ® Groundwater Supply ® Storm Damage Prevention ® Flood Control Furthermore,this Commission hereby finds the project, as proposed, is: (check one of the following boxes) Approved subject to: ® the following conditions which are necessary, in accordance with the performance standards set forth in the wetlands regulations, to protect those interests checked above. This Commission orders that all work shall be performed in accordance with the Notice of Intent referenced above, the following General Conditions, and any other special conditions attached to this Order. To the extent that the following conditions modify or differ from the plans, specifications, or other proposals submitted with the Notice of Intent,these conditions shall control. Denied because: ❑ the proposed work cannot be conditioned to meet the performance standards set forth in the wetland regulations to protect those interests checked above.Therefore,work on this project may not go forward unless and until a new Notice of Intent is submitted which provides measures which are adequate to protect these interests, and a final Order of Conditions is issued. Y the PP❑ the information submitted b applicant is not sufficient to describe the site, the work, or the effect of the work on the interests identified in the Wetlands Protection Act. Therefore, work on this project may not go forward unless and until a revised Notice of Intent is submitted which provides sufficient information and includes measures which are adequate to protect the Act's interests, and a final Order of Conditions is issued. A description of the specific information which is lacking and why it is necessary is attached to this Order as per 310 CMR 10.05(6)(c). General Conditions (only applicable to approved projects) 1. Failure to comply with all conditions stated herein, and with all related statutes and other regulatory measures, shall be deemed cause to revoke or modify this Order. 2. The Order does not grant any property rights or any exclusive privileges; it does not authorize any injury to private property or invasion of private rights. 3. This Order does not relieve the permittee or any other person of the necessity of complying with all other applicable federal, state, or local statutes, ordinances, bylaws, or regulations. V PA Forth 5 Page 2 of 7 Rev.02100 Massachusetts Department of Environmental Protection DEP File Number. Bureau of Resource Protection - Wetlands 64-301 WPA Form 5 - Order of Conditions Provided by DEP Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Findings (cont.) 4. The work authorized hereunder shall be completed within three years from the date of this Order unless either of the following apply: a. the work is a maintenance dredging project as provided for in the Act; or b. the time for completion has been extended to a specified date more than three years, but less than five years, from the date of issuance. If this Order is intended to be valid for more than three years, the extension date and the special circumstances warranting the extended time period are set forth as a special condition in this Order. 5. This Order may be extended by the issuing authority for one or more periods of up to three years each upon application to the issuing authority at least 30 days prior to the expiration date of the Order. 6. Any fill used in connection with this project shall be clean fill. Any fill shall contain no trash, refuse, rubbish, or debris, including but not limited to lumber, bricks, plaster, wire, lath, paper, cardboard, pipe, tires, ashes, refrigerators, motor vehicles, or parts of any of the foregoing. 7. This Order is not final until all administrative appeal periods from this Order have elapsed, or if such an appeal has been taken, until all proceedings before the Department have been completed. 8. No work shall be undertaken until the Order has become final and then has been recorded in the Registry of Deeds or the Land Court for the district in which the land is located, within the chain of title of the affected property. In the case of recorded land, the Final Order shall also be noted in the Registry's Grantor Index under the name of the owner of the land upon which the proposed work is to be done. In the case of the registered land, the Final Order shall also be noted on the Land Court Certificate of Title of the owner of the land upon which the proposed work is done. The recording information shall be submitted to this Conservation Commission on the form at the end of this Order, which form must be stamped by the Registry of Deeds, prior to the commencement of work. 9. A sign shall be displayed at the site not less then two square feet or more than three square feet in size bearing the words, "Massachusetts Department of Environmental Protection" [or,"MA DEP"] "File Number 64-301 " 10. Where the Department of Environmental Protection is requested to issue a Superseding Order, the Conservation Commission shall be a party to all agency proceedings and hearings before DEP. 11. Upon completion of the work described herein, the applicant shall submit a Request for Certificate of Compliance (WPA Form 8A)to the Conservation Commission. 12. The work shall conform to the plans and special conditions referenced in this order. 13. Any change to the plans identified in Condition #12 above shall require the applicant to inquire of the Conservation Commission in writing whether the change is significant enough to require the filing of a new Notice of Intent. 14. The Agent or members of the Conservation Commission and the Department of Environmental Protection shall have the right to enter and inspect the area subject to this Order at reasonable hours to evaluate compliance with the conditions stated in this Order, and may require the submittal of any data deemed necessary by the Conservation Commission or Department for that evaluation. WPA Form 5 Page 3 of 7 Rev.02100 D Massachusetts Department of Environmental Protection DEP File Number: Bureau of Resource Protection - Wetlands 64-301 WPA Form 5 - Order of Conditions Provided by DEP Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Findings (cont.) 15. This Order of Conditions shall apply to any successor in interest or successor in control of the property subject to this Order and to any contractor or other person performing work conditioned by this Order. 16. Prior to the start of work, and if the project involves work adjacent to a Bordering Vegetated Wetland, the boundary of the wetland in the vicinity of the proposed work area shall be marked by wooden stakes or flagging. Once in place, the wetland boundary markers shall be maintained until a Certificate of Compliance has been issued by the Conservation Commission. 17. All sedimentation barriers shall be maintained in good repair until all disturbed areas have been fully stabilized with vegetation or other means. At no time shall sediments be deposited in a wetland or water body. During construction, the applicant or his/her designee shall inspect the erosion controls on a daily basis and shall remove accumulated sediments as needed. The applicant shall immediately control any erosion problems that occur at the site and shall also immediately notify the Conservation Commission, which reserves the right to require additional erosion and/or damage prevention controls it may deem necessary. Sedimentation barriers shall serve as the limit of work unless another limit of work line has been approved by this Order. Special Conditions (use additional paper, if necessary): See Attachment Findings as to municipal bylaw or ordinance Furthermore, the hereby finds (check one that applies): Conservation Commission ❑ that the proposed work cannot be conditioned to meet the standards set forth in a municipal ordinance or bylaw specifically: Name Municipal Ordinance or Bylaw Therefore,work on this project may not go forward unless and until a revised Notice of Intent is submitted which provides measures which are adequate to meet these standards, and a final Order of Conditions is issued. ❑ that the following additional conditions are necessary to comply with a municipal ordinance or bylaw, specifically: Name Municipal Ordinance or Bylaw The Commission orders that all work shall be performed in accordance with the said additional conditions and with the Notice of Intent referenced above. To the extent that the following conditions modify or differ from the plans, specifications, or other proposals submitted with the Notice of Intent, WPA Form 5 Page 4 of 7 Rev.02/00 Massachusetts Department of Environmental Protection DEP File Number: Bureau of Resource Protection - Wetlands 64-301 WPA Form 5 - Order of Conditions Provided byDEP -' Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Findings (cont.) Additional conditions relating to municipal ordinance or bylaw: This Order is valid for three years, unless otherwise specified as a special condition pursuant to General Conditions#4, from the date of issuance. Jc.r.y 271 2unt, Date This Order must be signed by a majority of the Conservation Commission. The Order must be mailed by certified mail (return receipt requested)or hand delivered to the applicant. A copy also must be mailed or hand delivered at the same time to the appropriate Department of Environmental Protection Regional Office (see Appendix A)and the property owner(if different from applic ). s: / 1 SZr On 64VA", Of F�o Day Month and Year before me personally appeared Mine known to be the person described in and who executed the foreJExpire NMI.CEFALA aqn dged that he/s a ex cuted th sa a as his/her free act and Notary Public Commonwealth of Massachusetts My Commission Expires to ublic My Commission This Order is issued to th plicant as (lows: by hand delivery on 1V�u�l� \'S Zvu\ ❑ by certified mail, return receipt requested, on WPA Forth 5 Page 5 of 7 Rev.02100 Massachusetts Department of Environmental Protection DEP File Number: Bureau of Resource Protection - Wetlands 64-301 WPA Form 5 - Order of Conditions Provided by DEP y9 Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 C. Appeals The applicant, the owner, any person aggrieved by this Order, any owner of land abutting the land subject to this Order, or any ten residents of the city or town in which such land is located, are hereby notified of their right to request the appropriate DEP Regional Office to issue a Superseding Order of Conditions. The request must be made by certified mail or hand delivery to the Department, with the appropriate filing fee and a completed Appendix E: Request of Departmental Action Fee Transmittal Form, as provided in 310 CMR 10.03(7)within ten business days from the date of issuance of this Order. A copy of the request shall at the same time be sent by certified mail or hand delivery to the Conservation Commission and to the applicant, if he/she is not the appellant. The request shall state clearly and concisely the objections to the Order which is being appealed and how the Order does not contribute to the protection of the interests identified in the Massachusetts Wetlands Protection Act, (M.G.L. c. 131, § 40) and is inconsistent with the wetlands regulations (310 CMR 10.00). To the extent that the Order is based on a municipal ordinance or bylaw, and not on the Massachusetts Wetlands Protection Act or regulations, the Department has no appellate jurisdiction. D. Recording Information This Order of Conditions must be recorded in the Registry of Deeds or the Land Court for the district in which the land is located, within the chain of title of the affected property. In the case of recorded land, the Final Order shall also be noted in the Registry's Grantor Index under the name of the owner of the land subject to the Order. In the case of registered land, this Order shall also be noted on the Land Court Certificate of Title of the owner of the land subject to the Order of Conditions. The recording information on Page 7 of Form 5 shall be submitted to the Conservation Commission listed below. Salem Conservation Commission WPA Form 5 Page 6 of 7 Rev.02100 Massachusetts Department of Environmental Protection DEP File Number: Bureau of Resource Protection - Wetlands 64-301 m " WPA Form 5 - Order of Conditions Provided by DEP Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 D. Recording Information (cont.) Detach on dotted line, have stamped by the Registry of Deeds and submit to the Conservation Commission. To: Salem Conservation Commission Please be advised that the Order of Conditions for the Project at: 201-205 Highland Avenue 64-301 Project Location DEP File Number Has been recorded at the Registry of Deeds of: County Book Page for: Property Owner and has been noted in the chain of title of the affected property in: Book Page In accordance with the Order of Conditions issued on: Date If recorded land, the instrument number identifying this transaction is: Instrument Number If registered land, the document number identifying this transaction is: Document Number Signature of Applicant WPA Form 5 Page 7 of 7 Rev.02/00 LIST of PLANS ORDERS OF CONDITIONS,# 64-301 Title: Date: Sign and Stamped by: On File with: Ridgeside Apts. 12/27/99 HW, Moore Salem Con Corn Sheets 2,3,5, & 6 of 11 Sheets 1 &2 of 2 dated 12/28/99 Sheets 8 and 9 dated 12/28/99 Amended Orders of Conditions (February 8, 2001): Ridgeside Apts. Site Plan Sheet 3 of 11 11-23-99 H.W. Moore (Amendment showing no cut/no disturbance area and boulder line) Ridgeside Apts. Site Plan Sheet 3 of 11 11-23-99 H.W. Moore (Amendment showing parking garages and trash compactor) ' Salem Conservation Commission SPECIAL CONDITIONS—DEP FILE #64-301, 201-201 Highland Avenue 1. The Conservation Agent will be notified 48 hours prior to commencement of construction activities(978- 745-9595 ext. 311). Members and agents of the Salem Conservation Commission(Commission) shall have the right to enter and inspect the premises to evaluate and ensure compliance with the conditions and performance standards stated in this Order, the Notice of Intent, the referenced plans, the Act, and 310 CMR 10.00, and may require any information,measurements,photographs, observation and/or materials or may require the submittal of any data or information deemed necessary by the Commission, agent, or DEP determines that any of the work is not in compliance with this Order of Conditions. Work shall not resume until the Commission is satisfied that the work will comply, and has so notified the applicant in writing. 2. Approval of this application does not constitute compliance with any law or regulation other than MGL Chapter 131, Section 40, and Wetlands Regulations 310 CMR 10.00. 3. This Order shall apply to any successor in control or successor in interest of the property described in the Notice of Intent and accompanying plans. These obligations shall be expressed in covenants in all deeds to succeeding owners or portions of the property. 4. The form provided at the end of this Order shall be completed and stamped at the Registry of Deeds after the expiration of the 10-day appeal period and within 30 days of the issuance if no request for appeal has been filed with the Department of Environmental Protection. This form shall be returned to the Commission within 21 days of recording accordance and prior to commencement of any activities subject to the Order of Conditions. 5. Prior to any work commencing, a sign shall be displayed showing DEP file#64-301, and not placed on a living tree. 6. The term "Applicant' as used in this Order of Conditions shall refer to the owner, any successor in interest or successor in control of the property referenced in the Notice of Intent, supporting documents and this Order of Conditions. The Commission shall be notified in writing within 30 days of all transfers of title of any portion of the property that takes place prior to issuance of the Certificate of Compliance. 7. It is the responsibility of the applicant to procure all other applicable federal, state and local permits and approvals associated with this project. These permits may include but are not necessarily limited to the following: (1) Section 404 of the Federal Water Pollution Control Act(P.L. 92-500,86 stat. 816),U.S.Army Corp of Engineers. (2) Water Quality Certification in accordance with the Federal Water Pollution Control under authority of sec. 27 (5)of Chapter 21 of the Massachusetts General Laws as codified (3) Flood Plain (4) Grading Ordinance 8. If there are conflicting conditions within this Order, the stricter condition(s)shall rule. 9. All work shall be performed so as to ensure that there will be no sedimentation into wetlands and surface waters during construction or after completion of the project. 10. The Commission and its Administrator shall have the discretion to modify the erosion/siltation control methods and boundary during construction if necessary. 11. All work shall be performed in accordance with this Order of Conditions and approved site plans(s). No alteration of wetland resource areas or associated buffer zone,other than that approved in this Order, shall occur on this property without prior approval from the Commission. ' 12, If any changes are made in the above-described plan(s)which may or will alter an area subject to protection under the Wetlands Protection Act,or any changes in activity subject to regulations under G.L. Ch. 131, Section 40,the applicant shall inquire from this Commission in writing,prior to their implementation in the field, whether the change(s)is significant enough to require the filing of a new Notice of Intent. Any error in the plans or information submitted by the applicant shall be considered changes and the above procedures shall be followed. A copy of such request shall at the same time be sent to the Department of Environmental Protection. 13. In conjunction with the sale of this property or any portion thereof before a Certificate of Compliance has been issued, the applicant or current landowner shall submit to the Commission a signed statement by the buyer that he/she is aware of an outstanding Order of Conditions on the property and has received a copy of the Order of Conditions. 14. Specific conditions as indicated herein shall continue in force beyond the Certificate of Compliance,in perpetuity, and shall be referred to in all future deeds to this property. PRIOR TO CONSTRUCTION 15. Prior to commencement of any activity on this site,there shall be a PRECONSTRUCTION MEETING between the project supervision, the contractor responsible for the work or its administrator to and phone numbers of all responsible parties shall be registered with the Commission at the pre-construction meeting. 16. Prior to the pre-construction meeting and commencement of any activity on this site,sedimentation and erosion control barriers shall be installed as shown on the approval plan(s) and detail drawings. The Commssion and/or its Administrator shall inspect and approve such installation at the pre-construction meeting. 17. Prior to the commencement of any activity on this site, the applicant or current landowner shall submit to the Commission in writing a construction schedule/sequence of work to complete this project. 18. Prior to any work on site, the proposed limits of work shall be clearly marked with stakes or flags and shall be confirmed by the Commission or its Administrator. Such markers shall be checked and replaced as necessary and shall be maintained until all construction is complete. Workers shall be informed that no use of machinery, storage of machinery or materials, stockpiling of soil or construction activity is to occur beyond this line at anytime. 19. Prior to commencement of construction on site, the limits of wetland resource areas closest to construction activity shall be flagged with surveyor's tape and shall remain in place during construction. The limits of areas to be impacted and the limits of work in the replication area (s)shall be clearly flagged. 20. There shall be hay bales and wooden staked stored under cover on the site to be used only for emergency erosion control. EROSION CONTROL 21. Appropriate erosion control devices shall be in place prior to the beginning of any phases of construction, and shall be maintained during construction in the wetland areas and buffer zones. The erosion control specification provided in the Notice of Intent and the erosion control provision in the Order will be the minimum standards for this project; additional measures may be required by the Commission. 22. All debris, fill and excavated material shall be stockpiled a location far enough away from the wetland resource areas to prevent sediment from entering wetland resource areas. 23. Erosion and sedimentation control devices shall be inspected after each storm event and repaired or replaced as necessary. Any accumulated silt adjacent to the barriers shall be removed. 24. The areas of construction shall remain in a stable condition at the close of each construction day. 25. Any de-watering of trenches or other excavations required during construction shall be conducted so as to prevent siltation of wetland resource areas. All discharges from de-watering activities shall be filtered through haybale sediment traps, silt filter bags or other means approved by the Commission or its Administrator. 26. Within thirty days of completion of construction on any given portion of the project, all disturbed areas in the completed portion of the site shall be permanently stabilized with rapidly growing vegetative cover, using sufficient top soil to assure long-term stabilization of disturbed areas. 27. If soils are to be disturbed for longer than two months, a temporary cover of rye or other grass should be established to prevent erosion and sedimentation. If the season is not appropriate for plant growth, exposed surfaces shall be stabilized by other appropriate erosion control measures, firmly anchored, to prevent soils from being washed by rain or flooding. DURING CONSTRUCTION 28. A copy of the Order of Conditions, construction plans, and copies of the documents and reports cited in Condition# 11,shall be on the site upon commencement and during any site work for contractors to view and adhere to. 29. Erosion and sedimentation control devices shall be inspected after each storm event and repaired or replaced as necessary. Any accumulated silt adjacent to the barriers shall be removed. 30. Only clean fill,free of masonry, stumps, asphalt, and any other kind of waste material shall be used on the site. 31. All waste products,grubbed stumps, slash,construction materials,etc. shall be deposited at least 100 feet from wetland resource areas and 200 feet from rivers. 32. All filling or removal of waste material from the site shall be done in accordance with the regulations of the City of Salem Health Department. 33. Cement trucks shall not be washed out in any wetland resource or buffer zone area. Any deposit of cement or concrete products into a buffer zone or wetland resource area shall be removed by hand. 34. No fuel,oil,or other pollutants shall be stored in any resource area or the buffer zone thereto,unless specified in this Order of Conditions. 35. There shall be no pumping of water from wetland resource areas. 36. During construction, all drainage structures shall be inspected regularly and cleaned as necessary. 37. Immediately following drainage structure installation, all inlets shall be protected by silt fence,hayblae barriers and/or silt bags to filter silt from stormwater before it enters the drainage system. 38. The project shall not cause an increase in run-off onto adjacent properties, either during construction or when completed. 39. The applicant is hereby notified that failure to comply with all requirements herein may result in the issuance of enforcement actions by the Conservation Commission including,but not limited to, civil administrative penalties under M.G.L. Chapter 21A, section 16. POST CONSTRUCTION 40. All disturbed areas, slopes and proposed landscape areas shall be loamed and seeded or stabilized through the use of erosion control blankets or other approved means. All disturbed areas will be graded, loamed, and seeded prior to November 1 of each year, if possible. No disturbed areas or stockpiled material will be left unprotected or without erosion controls during the winter. 41. Upon completion of construction, the applicant or current landowner shall submit the following to the Commission to request a Certificate of Compliance: 41. Upon completion of construction, the applicant or current landowner shall submit the following to the Commission to request a Certificate of Compliance: (1) A letter requesting a Certificate including the following information: a. Name and address of current landowner; b. Name and address of the individual/trust or other entity to whom the Certificate is to be issued: c. Street address and lot number for the project; and d. DEP file number (2) A letter from a Registered Professional Engineering or Land Surveyor certifying compliance of the property with this Order of Conditions (3) An"As-Built"plan signed and stamped by a Registered Professional Engineer showing post- construction conditions and: a. As-built elevations of all drainage ways constructed within 100 feet of any wetland resource area; b. As-built elevations and grades of all filled or altered wetland resource areas,buffer zones and replicated areas; and c. Distances to all structures within 100 feet of any wetland resource area. 42. When issued, the Certificate of Compliance must be recorded at the Essex County Registry of Deeds. 43. If the completed work differs from that in the original plans and conditions, the report must specify how the work differs; at which time the applicant shall first request a modification to the Order. Only upon review and approval by the Commission, may the applicant request in writing a Certificate of Compliance as described above. 44. Erosion control devices shall remain in place and properly functioning until all exposed soils have been stabilized with final vegetative cover and the Commission and/or its Administrator has authorized their removal. 45. The following condition(s)shall extend beyond the Certificate of Compliance,in perpetuity, and shall be recorded as such on the Certificate of Compliance and in all future deeds to this property: PERPETUAL CONDITIONS 46. There shall be no dumping of leaves, grass clippings,trash or any kind of refuse in the resource are. 47. Herbicides shall not be applied within 100 feet of the wetland. 48. No sodium-based products shall be used for control of ice or snow within 100 feet or the wetland. ADDITIONAL CONDITIONS 49. The relocation of the city drainage easement, stormwater calculations, and entire drainage system design shall be approved in writing by the City Engineer with copy to Commission prior to the start of any work. 50. Plans shall be revised to include the creation of a no cut/no disturbance area along river and an area of post construction no cut/no disturbance area to be naturalized with plantings. The final No Cut/No Disturbance Zone(pre-construction and post-construction zones) shall be combined as one and mathmatized on a modified plan. The final No Cut/No Disturbance Zone shall be permanently delineated on site with 3' boulders or other means to be approved by the Commission. A deed restriction shall be placed to reference and identify the final No Cut/No Disturbance Zone. Deed shall also include these Special Conditions. As-Built drawings shall show the pre and post-construction zones as one mathmatized No Cut/No Disturbance Zone. 4 AMENDED ADDITIONAL CONDITIONS (February 8, 2001) 51. The no cut/no disturbance zone will be delineated by a stone/boulder fence line,which will be landscaped to enhance the surrounding area and to prevent any type of access to the resource area. 52. The hydraulic compactor will contain an emergency spill kit at all times in the event of an accidental hydraulic break or leak. 53. The new site plan shall be recorded with the property deed as a restriction in order to prevent any future disturbance to the no cut/no disturbance zone. No work shall be performed until copies of the modified plan are submitted to and approved by the Salem Conservation Commission. C.n.W 201S05Highl.d Consemfion Commission Salem, Massachusetts 01970 February 13, 2001 Mr. Joseph Correnti Serafini, Serafini,Darling&Correnti, LLP Attorneys at Law 63 Federal Street Salem,MA 01970 Re: Hawthorne Commons No Cut/No Disturbance Area Plan Dear Mr. Correnti: This letter is to confirm that on Thursday,February 8, 2001, the Salem Conservation Commission discussion the plan that delineated the no cut/no disturbance line as required under the Order of Conditions (64-301) issues on January 27, 2000 (special condition#50). In addition, the applicant requested that the Commission approve a minor change to the Site Plan,which depicts the construction of a 12-unit garage located at the north comer of the site, an 8-unit garage to the southeast extent of the site and a placement of a hydraulic compactor to the southern most extent of the site. The Salem Conservation Commission approved the no cut/no disturbance zone and the additional changes of the garage units and compactor by a vote of 7-0.The commission however requested the following additional conditions: • The no cut/no disturbance zone will be delineated by a stone/boulder fence line,which will be landscaped to enhance the surrounding area and to prevent any type of access to the resource area. • The hydraulic compactor will contain an emergency spill kit at all times in the event of an accidental hydraulic break or leak. • The new site plan shall be recorded with the property deed as a restriction in order to prevent any future disturbance to the no cut/no disturbance zone. If you have any further questions or concerns,please feel free to contact me. S erely, Don Cefalo Senior Planner Cc: Salem Conservation Commission SERAFINI, SERAFINI, DARLING & CORRENTI, LLP ATTORNEYS AT LAW 63 FEDERAL STREET SALEM, MASSACHUSETTS 01970 JOHN R. SERAFINI, SR. TELEPHONE JOHN R. SERAFINI, JR. 978-744-0212 JOHN E. DARLING 781-581-2743 JOSEPH C. CORRENTI TELECOPIER ROBERT T. FORD 978-741-4683 February 2 , 2001 VIA HAND DELIVERY Don Cefalo, Administrator Salem Conservation Commission One Salem Green, 2"d Floor Salem, Massachusetts 01970 Re: Hawthorn Commons (former Vincent 's Potato Chip Site) 205 Highland Avenue Dear Mr. Cefalo: Enclosed please find eight copies of the Site Plan for the above referenced project, with the demarcation line showing the boulder placement. It is proposed that the three foot boulders be placed 20 feet on-center for the entire length of the line, as shown on the plan. Such placement will adequately define the no cut/no disturbance area. If you have any questions, please do not hesitate to call me. Verdos truly yours_2" , h C. Correnti JCC:dl Enclosures cc: Mr. Thomas K. Albert Mr. Roy Tiano 310 CMR 10.99 DEP File No. - (To be provided by DEP) - Form 5 1� City/Torn Salem Applicant Commonwealth of Massachusetts Order of Conditions Massachuetts Wetlands Protection Act G.L. c. 131, 540 From Salem Conservation Commission Issuing Authority To Autumn Tlavol pmpyt-_CO. Inc. Vinnantc Pni- r`Yhii f`n (Name of Applicant) (Name of property owner) 128 S. Bldg, 100 Grandview Rd 201-205 Highland Ave. Address Suite 324 E aintroo MA Address Calcm. Mn nla•lp 02184 This Order is issued and delivered as follows: ® by hand delivery to applicant or representative on 2/7/00 (date) ❑ by certified mail, return receipt requested on (date). This project is located at 201-205 Highland Ave The property is recorded at the Registry of Essex Book 7824,7897,20893, & 4544 Page 4c;n n91,437,G437 Certificate (if registered) 20 893 & 38811 The Notice of Intent for this project was filed on December 30, 1999 (date) The public hearing was closed on .TanusrrZ7, 2999` (date) Findings The Commission has reviewed the above-referenced Notice of Intent and plans and has held a public hearing on the project. Based on the information available to the COmmig4gi nn at this time, the r„m,n;cayop has determined that the area on which the proposed work is to be done is significant ;o the following interests in accordance with the Presumptions of Significance set forth in the regulations for each Area Subject to Protection Under the Act (check as appropriate):. Public water supply Flood Control land containing shellfish Private water supply Storm damage prevention Fisheries Ground water supply Prevention of pollution Protection of Wildlife Nabitat Total Filing Fee Submitted $1,575 State Share 6775 (1/2 fee in excess of S25) City/Town Share $800 Total Refund Due S City/Town Portion S state Portions (1/2 total) (1/2 total) Effective 11/10/89 5-1 Therefore, the CommsG�on hereby finds that the following conditions are necessary, in accordance with the Performance Standards set forth in the regulations, tc protect those interests checked above. The romm;aa;nn orders that all work shall be performed in accordance with said conditions and with the Notice of in referenced above. To the extent that the following conditions modify or differ from the plans, specifications or other proposals submitted with the Notice of Intent, the conditions shall control. General Conditions 1. Failure to comply with all conditions stated herein, and with all related statutes and other regulatory measures, shall be deemed cause to revoke or modify this Order. 2. The Order does not grant any property rights or any exclusive privileges; it does not authorize any injury to private property or invasion of private rights. 3. This Order does not relieve the permittee or any other person of the necessity of complying with all other applicable federal, state or local statutes, ordinances, by-laws or regulations. 4. The work authorized hereunder shall be completed within three years from the date of this Order unless either of the following apply: (a) the work is a maintenance dredging project as provided for in the Act; or (b) the time for completion has been extended to a specified date more than three years, but less than five years, from the date of issuance and both that date and the special circumstances warranting the extended time period are set forth in this Order. S. This Order may be extended by the issuing authority for one or more periods of up to three years each upon application to the issuing authority at least 30 days prior to the expiration date of the Order. 6. Any fill used in connection with this project shall bs clean fill, containing no trash, refuse, rubbish or debris, including but not limited to lumber, bricks, plaster, wire, lath, paper, cardboard, pipe, tires, ashes, refrigerators, motor vehicles or parts of any of the foregoing. 7. No work shall be undertaken until all administrative appeal periods from this Order have elapsed or, if such an appeal has been filed, until all proceedings before the Department have been completed. 8. No work shall be undertaken until the Final order has been recorded in the Registry of Deeds or the Land Court for the district in which the land is located, within the chain of title of the affected property. In the case of recorded land, the Final Order shall also be noted in the Registry's Grantor index under the name of the owner of the land upon which the proposed work is to be done. In the case of registered land, the Final order shall also be noted on the Land Court Certificate of Title of the owner of the land upon which the proposed work is to be done. The recording informatin shall be submitted to the m^�cinn on the form at the end of this Order prior to commencement of the work. 9. A sign shall be displayed at the site not less than two square feet or more than three square feet in size bearing the words, "Massachusetts Department of Environmental Protection, File Number 64-301 10. Where the Department of Environmental Protection is requested to make a determination and to issue a Superseding Order, the Conservation Commission shall be a party to all agency proceedings and hearings before the Department. c-2 il. Upon completion of the work described herein, the applicant shall forthwith request in writing that a Certificate of Compliance be issued stating that the work has been satisfactorily completed. 12. The work shall conform to the following plans and special conditions: Plans: Title Dated Signed and Stamped by: on File with: Ridgeside Apts. 12/27 99 HW Moore Salem Gott eem 2,3,5,& 6 of 11, Sheets 1 & 2 of 7 dared 12/28/99, --a cr.vo«� 8.and 9 dated 12/28/99 Special Conditions (Use additional paper if necessary) See Attached 50 Conditions (Leave Space Blank) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3A Issued By em Conservation Commission b Signature(s) G This order must be signed by a majority of the Conservation Commission. on this 27�_day. of 29- 2000 before me personally appeared J✓�=- abc ��'�� to me known to be the person described in and who executed the foregoing instrument and acknowledged that he/she IN same as his/her free act and deed. STEMMEMBLE Nota"W4cpubp0 AtaryPublic my commission expires The applicant, the owner, any person agrrieved by this Order, any owner of lend abutting the land upon which the proposed work is to be done, or any ten residents of the city or town in which such land is located, are hereby notified of their right to request the Department of Environmental Protection to issue a superseding Order, providing the request is made by certified mail or hand delivery to the Department, with the appropriate filing fee and Fee Transmittal Form as provided in 310 CMR 10.03(7), within ten days from the date of issuance of this determination. A copy of the request shall at the same time be sent by certified mail or hard delivery to the Conservation Commission and the applicant. Detach an dotted lire and submit to the ggmn4 prior to commencement of work. ............................................................................................................ Issuing Authority To Please be advised that the Order of Conditions for the project at File Number has been recorded at the Registry of and has been noted in the chain of title of the affected property in accordance with General Condition a on ,19 If recorded lard, the instrument number which identifies this transaction is If registered lard, the document number which identifies this transaction is Signature Applicant. 5-4A i Salem Conservation Commission SPECIAL CONDITIONS—DEP FILE#64-301,201-201 Highland venue 1. The Conservation Agent will be notified 48 hours prior to commencement of construction activities(978-745- 9595 ext.311). Members and agents of the Salem Conservation Commission(Commission)shall have the right to enter and inspect the premises to evaluate and ensure compliance with the conditions and performance standards stated in this Order,the Notice of Intent,the referenced plans,the Act,and 310 CMR 10.00,and may require any information,measurements,photographs,observation and/or materials or may require the submittal of any data or information deemed necessary by the Commission,agent,or DEP determines that any of the work is not in compliance with this Order of Conditions. Work shall not resume until the Commission is satisfied that the work will comply,and has so notified the applicant in writing. 2. Approval of this application does not constitute compliance with any law or regulation other than MGL Chapter 131, Section 40,and Wetlands Regulations 310 CMR 10.00. 3. This Order shall apply to any successor in control or successor in interest of the property described in the Notice of Intent and accompanying plans. These obligations shall be expressed in covenants in all deeds to succeeding owners or portions of the property. 4. The form provided at the end of this Order shall be completed and stamped at the Registry of Deeds after the expiration of the 10-day appeal period and within 30 days of the issuance if no request for appeal has been filed with the Department of Environmental Protection. This form shall be returned to the Commission within 21 days of recording accordance and prior to commencement of any activities subject to the Order of Conditions. 5. Prior to any work commencing, a sign shall be displayed showing DEP file#64-301,and not placed on a living tree. 6. The term"Applicant"as used in this Order of Conditions shall refer to the owner,any successor in interest or successor in control of the property referenced in the Notice of Intent,supporting documents and this Order of Conditions. The Commission shall be notified in writing within 30 days of all transfers of title of any portion of the property that takes place prior to issuance of the Certificate of Compliance. 7. It is the responsibility of the applicant to procure all other applicable federal,state and local permits and approvals associated with this project. These permits may include but are not necessarily limited to the following: (1) Section 404 of the Federal Water Pollution Control Act(P.L.92-500,86 stat.816),U.S.Army Corp of Engineers. (2) Water Quality Certification in accordance with the Federal Water Pollution Control under authority of sec. 27(5)of Chapter 21 of the Massachusetts General Laws as codified (3) Flood Plain (4) Grading Ordinance 8. If there are conflicting conditions within this Order,the stricter condition(s)shall rule. 9. All work shall be performed so as to ensure that there will be no sedimentation into wetlands and surface waters during construction or after completion of the project 10. The Commission and its Administrator shall have the discretion to modify the erosion/siltation control methods and boundary during construction if necessary. 11. All work shall be performed in accordance with this Order of Conditions and approved site plans(s). No alteration of wetland resource areas or associated buffer zone,other than that approved in this Order,shall occur on this property without prior approval from the Commission. t ( 12. If any changes are made in the above-described plan(s)which may or will alter an area subject to protection + under the Wetlands Protection Act,or any changes in activity subject to regulations under G.L.Ch. 131,Section 40,the applicant shall inquire from this Commission in writing,prior to their implementation in the field, whether the change(s)is significant enough to require the filing of a new Notice of Intent. Any error in the plans or information submitted by the applicant shall be considered changes and the above procedures shall be followed. A copy of such request shall at the same time be sent to the Department of Environmental Protection. 13. In conjunction with the sale of this property or any portion thereof before a Certificate of Compliance has been issued,the applicant or current landowner shall submit to the Commission a signed statement by the buyer that he/she is aware of an outstanding Order of Conditions on the property and has received a copy of the Order of Conditions. 14. Specific conditions as indicated herein shall continue in force beyond the Certificate of Compliance,in perpetuity,and shall be referred to in all future deeds to this property. PRIOR TO CONSTRUCTION 15. Prior to commencement of any activity on this site,there shall be a PRECONSTRUCTiON MEETING between the project supervision,the contractor responsible for the work or its administrator to and phone numbers of all responsible parties shall be registered with the Commission at the pre-construction meeting. 16. Prior to the pre-construction meeting and commencement of any activity on this site,sedimentation and erosion control barriers shall be installed as shown on the approval plan(s)and detail drawings. The Commssion and/or its Administrator shall inspect and approve such installation at the pre-construction meeting. 17. Prior to the commencement of any activity on this site,the applicant or current landowner shall submit to the Commission in writing a construction schedule/sequence of work to complete this project 18. Prior to any work on site,the proposed limits of work shall be clearly marked with stakes or flags and shall be confirmed by the Commission or its Administrator. Such markers shall be checked and replaced as necessary and shall be maintained until all construction is complete. Workers shall be informed that no use of machinery, storage of machinery or materials,stockpiling of soil or construction activity is to occur beyond this line at anytime. 19. Prior to commencement of construction on site,the limits of wetland resource areas closest to construction activity shall be flagged with surveyor's tape and shall remain in place during construction. The limits of areas to be impacted and the limits of work in the replication area(s)shall be clearly flagged. 20. There shall be hay bales and wooden staked stored under cover on the site to be used only for emergency erosion control. EROSION CONTROL 21. Appropriate erosion control devices shall be in place prior to the beginning of any phases of construction,and shall be maintained during construction in the wetland areas and buffer zones. The erosion control specification provided in the Notice of Intent and the erosion control provision in the Order will be the minimum standards for this project;additional measures may be required by the Commission. 22. All debris,fill and excavated material shall be stockpiled a location far enough away from the wetland resource areas to prevent sediment from entering wetland resource areas. 23. Erosion and sedimentation control devices shall be inspected after each storm event and repaired or replaced as necessary. Any accumulated silt adjacent to the barriers shall be removed. 24. The areas of construction shall remain in a stable condition at the close of each construction day. Y 25. Any de-watering of trenches or other excavations required during construction shall be conducted so as to r e prevent siltation of wetland resource areas. All discharges from de-watering activities shall be filtered through Y haybale sediment traps,silt filter bags or other means approved by the Commission or its Administrator. 26. Within thirty days of completion of construction on any given portion of the project,all disturbed areas in the completed portion of the site shall be permanently stabilized with rapidly growing vegetative cover,using sufficient top soil to assure long-term stabilization of disturbed areas. 27. If soils are to be disturbed for longer than two months a temporary cover of a or other s should be B porary rye Bras established to prevent erosion and sedimentation. If the season is not appropriate for plant growth,exposed surfaces shall be stabilized by other appropriate erosion control measures,firmly anchored,to prevent soils from being washed by ram or flooding. DURING CONSTRUCTION 28. A copy of the Order of Conditions,construction plans,and copies of the documents and reports cited in Condition# 11, shall be on the site upon commencement and during any site work for contractors to view and adhere to. 29. Erosion and sedimentation control devices shall be inspected after each storm event and repaired or replaced as necessary. Any accumulated silt adjacent to the barriers shall be removed. 30. Only clean fill,free of masonry, stumps,asphalt,and any other kind of waste material shall be used on the site. 31. All waste products,grubbed stumps,slash,construction materials,etc.shall be deposited at least 100 feet from wetland resource areas and 200 feet from rivers. 32. All filling or removal of waste material from the site shall be done in accordance with the regulations of the City of Salem Health Department. 33. Cement trucks shall not be washed out in any wetland resource or buffer zone area. Any deposit of cement or concrete products into a buffer zone or wetland resource area shall be removed by hand 34. No fuel,oil,or other pollutants shall be stored in any resource area or the buffer zone thereto,unless specified in this Order of Conditions. 35. There shall be no pumping of water from wetland resource areas. 36. During construction,all drainage structures shall be inspected regularly and cleaned as necessary. 37. Immediately following drainage structure installation,all inlets shall be protected by silt fence,hayblae barriers and/or silt bags to filter silt from stormwater before it enters the drainage system. 38. The project shall not cause an increase in run-off onto adjacent properties,either during construction or when completed. 39. The applicant is hereby notified that failure to comply with all requirements herein may result in the issuance of enforcement actions by the Conservation Commission including,but not limited to,civil administrative penalties under M.G.L.Chapter 21A,section 16. POST CONSTRUCTION 40. All disturbed areas,slopes and proposed landscape areas shall be loamed and seeded or stabilized through the use of erosion control blankets or other approved means. All disturbed areas will be graded,loamed,and seeded prior to November l of each year,if possible. No disturbed areas or stockpiled material will be left unprotected or without erosion controls during the winter. 0 r 7 a � 41. Upon completion of construction,the applicant or current landowner shall submit the following to the Commission to request a Certificate of Compliance: (1) A letter requesting a Certificate including the following information: a. Name and address of current landowner, b. Name and address of the individual/trust or other entity to whom the Certificate is to be issued: c. Street address and lot number for the project;and d. DEP file number (2) A letter from a Registered Professional Engineering or Land Surveyor certifying compliance of the property with this Order of Conditions (3) An"As-Built"plan signed and stamped by a Registered Professional Engineer showing post-construction conditions and: a. As-built elevations of all drainage ways constructed within 100 feet of any wetland resource area; b. As-built elevations and grades of all filled or altered wetland resource areas,buffer zones and replicated areas;and c. Distances to all structures within 100 feet of any wetland resource area. 42. When issued,the Certificate of Compliance must be recorded at the Essex County Registry of Deeds. 43. If the completed work differs from that in the original plans and conditions,the report must specify how the work differs;at which time the applicant shall fast request a modification to the Order. Only upon review and approval by the Commission,may the applicant request in writing a Certificate of Compliance as described above. 44. Erosion control devices shall remain in place and properly functioning until all exposed soils have been stabilized with final vegetative cover and the Commission and/or its Administrator has authorized their removal. 45. The following condition(s)shall extend beyond the Certificate of Compliance,in perpetuity,and shall be recorded as such on the Certificate of Compliance and in all future deeds to this property: PERPETUAL CONDITIONS 46. There shall be no dumping of leaves,grass clippings,trash or any kind of refuse in the resource are. 47. Herbicides shall not be applied within 100 feet of the wetland. 48. No sodium-based products shall be used for control of ice or snow within 100 feet or the wetland. ADDITIONAL CONDITIONS 49. The relocation of the city drainage easement, stormwater calculations,and entire drainage system design shall be approved in writing by the City Engineer with copy to Commission prior to the start of any work. --50.—Plans shall be revised to-include the creation of a no cut/no disturbance-area along-river and-an area of post construction no cut/no disturbance area to be naturalized with plantings.The final No Cut/No Disturbance Zone(pre-construction and post-construction zones)shall be combined as one and mathmatized on a modified plan.The final No Cut/No Disturbance Zone shall be permanently delineated on site with 3'boulders or other means to be approved by the Commission.A deed restriction shall be placed to reference and identify the final No Cut/No Disturbance Zone. Deed shall also include these Special Conditions. As-Built drawings shall show the pre and post-construction zones as one mathmatized No Cut/No Disturbance Zone. No work shall be performed until copies of the modified plan are submitted to and approved by the Salem Conservation Commission. cx=.rawmi•xosrasuWe 01/07/2000 16:56 FAX 781 982 5490 COLER&COLANTONIO 781 902 5490 IM 001 t r RECEIVED • COLAIV • ENGINra6E E • 101 Accord Park Drive • Norwell MA 02061-1685 s • To: Mr. Steve Dibble - Company City of Salem Conservation Commission Fax Number 978-744 9327 Business Phone 978-745-9595 From: Chris Rejoard Fax Number 781 982 54 a0 Business Phone 781 792 222a . _ Date &Time: 01/07/00 4:42 kl Pages �—I Re Ridgesidt, Apart ants, 201-205 Highland Avenue Note: Steve: There have been a couple rwa sions tc the numbers referenced in the NOice of Intent for Ridgeside Apartments on ; Ihhland Avenue. The original NOI referem.':;,i a net increase of impervious area of 22,00C" square feet on page 3 of the project narrarsve. This number hr3 been revised and is now.i7.000 square feet. The original NOI refer f;nced three storr water outlets in Section 4.4 ao page 4. There are actually two stormwater outlets as shown on the submitted plans. I apologize for the discrepancies as t ,ire were several rei editions of the plans prior to finalization. If you have any questions or'ooncerns please giv, me a call. I will confirm that you received this fax next week. Thank you Chris Reichard The documents.accompanying this facsimile transit mion m:N lin confidential information belonging to the sendu; which is legally privileged. The Information is Intended only for the use of the Ind,�lual or ontlty named above. H you are not the intended recipient you are hereby notinjil that any disclosure,copying, distrittring or tr+.�8 e eery action In reliance on the contents of this communloation is- strictly prohbited. If you have recalved.this tnutsm',aio t in erro.. notify us by telephone immediately to aranp j for return of the documents to us. 0 01/07/2000 16:56 FAX 781 082 5490 CO1CR&COLANTONIO 781 982 5490 IM002 . i PROJECT NARRATIVE .0 INTRODUCTION Autumn Development Company, Too. is proposing to redevelop the Vincent's Potato Chia site located at 201-205 Highland Avenue in Salem, Massachusetts (See Section III, Figure 1). Proposed redevelopment of the site will include razing existing buildings, site grading and cleanup and construction of apartment buildings. The site appears on City of Salem Assessor's Map 13 as lot number 4. The site is currently developed and amenities associated with the Vincent facility currently exist on-site. A portion of the proposed improvements are located in the 100-foot buffer zone of bordering vegetated wetland (BV W)and inland bank associated with an intermittent stream. 2.0 EXISTING CONDIT ONS The 6.9-acre site is bordered to the north by Highland Avenue, to the west by First Street. to the east by property owned by New England Power and to the south by property owned by the Ledgemere Condominium Corporation. The southern portion of the site is characterized by un- developed open space containing ledge o rtcroppings. Site amenities associated with the existing Vincent Potato Chip building include a paved parldng lot, loading areas and landscaped areas. Approximately 100,000 square feet of .impervious surfaces currently exist on-site and approximately 139,000 square feet of the site is currently developed or disturbed. Approximately 35.300 square feet of the 100-foot buffer zone is currently developed by buildings,amenities and disturbeu areas. A concrete wall approximately 480 feet in length extends along the westem property iine beginning at the intersection of First Street and Highland Avenue. A 12-foot wide drain easement bisects the property and a 12-inch reinforced concrete pipe (RCP) outfall is located near the center of the property adjacei+, to the drain easement. These drainage fa:i'ities route sto-tmwater from First Street and :.xisting;);eking facilities toward BV W located along the eastern property boundary.Existing drainage fa:;Wities ire out-dated and do not provide adr luate sedimem removal and protection of wetland tcsoutce yeas. Approximately 340 linear fapt of stone wall is located along the eastern and southam property boundary in the undeveloped )pen space. The site is dominated by upland plant species such as multiflora rose(Rosa multlflora),wild filly- of-the-valley(Makutrhemum canadense), i-, se solumon's seal(Polygonatum bii lorum), Jap mere knotweed (Polygonum cuspidatum) and staa.'torn sumac (Rhos typhina). The site is located in Zone C (Areas of Minimal Flooding) according to the Salem FIRM Map Community ?anel Number 250102 0005 B (See Section III, Figure 3). .According to the 1997-1998 edition of the Massachusetts Natural Heritage Atlas, there are no estimated habitats of rare wildlife or cu tified vernal pools on or within 100-feet of the site(See Section III,Figure 2). Based on Appendix D of the Notice of Intent (WPA Farm 3). there azC no Areas of Critical Environmental Caacern (ACEC) located in the City of Salem. Nonce of intent 1 Autumn Development Company,Inc. Salem,MA Ridgeside Aparrments 01/07/2000 16:57 i'A% 781 982 5490 COLER&COLANTONIO - 781 982 5490 2003 3.0 WETLAND RESOURCE AREAS On-site investigations were performed on April 27, 1999 to determine the presence of wetland resource areas subject to protection under the Massachusetts Wetlands Protection Act and the City of Salem Wetlands Ordinance on or within 100-feet of the site. Wetlands were delineated according to the DF_P Publication: Dehnearing Bordering Vegetated Wetlands Under the Massachusetts Wetlands Protection Act using hydric soil indicators, wetland vegetation and evidence of wetland hydrology. 3.1 Bordering Vegetated Wetland Two areas of BV W associated with an intermittent stream were delineated on property using blue plastic survey tape and were numbers sequentially using alphanumeric symbols. Wetland .",cries A contained a total of 25 flags and begins at the southeast comer of the property continuin close to the eastern property line to the end at the ;jortheasern corner of the property near IL, hland Avenue. Wetland Series B is locateo at `he southwestcm corner of the site and contains a tiAal of 5 flags. Wetland vegetation consisting of skunk cabbage (Symplocarpus foetidus), spotted jewelweed(Impatiens capenvis), red maple (Ater rubrum), sensitive fern (Onoclea sensibilis), sweet pepperbush(Clerhra alnifolia), arrow-wood (Viburnum dentatum) and highbush bluabetry (Vaccinium corymbosum) provides wildlife habitat. . Plant roots stabilize the soil and remove pollutants, thus providing storm/ flood damage protection and pollution prevention. Wetland vegetation provides food and cover for a vaiety of species of wildlife. Certain areas of the 100- foot buffer zone have been colonized by invasive species consisting of multiflom i rose, honeysuAkle (Lonicera spp.) and Japanese knotweed. The invasive species have crow.3ed out native vegetation and reduced wildlife habitat value of the 100-foot buffer zone_ 3.2 intermittent Stream An intermittent stream flows to the mu'.h along the easieru property boundary. This inter,.-iinent stream is indicated on the 1985 U.S _,). Salun Massachusetts Quadrangle as a light bl7:P line (intermintent). The stream is indicated as a first -.),Jer stream on the current U.S.G.S. map and is indicated as intermittent on the Soil Srwey of Esaex County Massachusetts, Sheet Nu ilixt: 11. Water does not flow in a well-defined ch mnel for the entire length of the stream and their, is no Zone A floodplain associated with the stream on the Salem FIRM Map Community panel Number 250102 0005 B (See Section III, Figure 3).The watershed size has been estimated from the U.S.G.S. map to be approximately I square mile. Portions of the stream do not have a well- defined channel and the bottom material is thick and organic in sections. No water cniltrol structures or U.S.G.S. stream gauges were identified. This stream did not appear en the Massachusetts Stream Classification Program: Inventory of Rivers and Streams, 1982(Re=printed 1984). No fish were observed during our site investigations. The mapped resources and collected information/data indicate that this stream is intermittent(See Section VII,Appendix B). 3.3 Sank The portion of the land surface abutting and cortming, the water of the intermittent stresm is classified as the bank wetland resource area. The upper boundary of the bank is located at the first observable break in slope between The stream channel and BV W. The lower boundary o, .the bank is at the break in slope at the low p•Aut in the streambed. The intermittent stream bank acts to control flooding during times of heavy :am. Vegetation on the bank and in adjacent 3VW Notice of Intent 2 Autumn Development Company,Inc. Soler M4 Ridgeskk Apartments 01/07/2000 16:58 LAX 781 982 5490 COLER&COLANTONIO lei 982 5490 1@ 004 consisting of highbush blueberry, re 1. maple and arrow wood prevents storm damage and pollution and provides wildlife habitat. 4.0 PROPOSED IMPROVEMENTS The proposed project will improve existng conditions on-site. Landscaping will improve aesthetics, invasive plant removal will improve wildlife habitat, drainage upgrades will treat stormwater and protect wetland resource areas and residential development will result in reduced impacts as compared to the previous commercial use of the site. portions of the proposed improvements are located in the 100-foot buffer zone of BVW and bank (See Section. VM, Project Plans). No work will take )"lace in BVW or on bank and erosion and sedime-nation controls installed at the limits of wort; will prevent adverse impacts to wetland resources during construction and until the site is stable (See Sestior:ITT.,Figure 4). No adverse impacts tc 3VW are anticipated as a result of the pm,no!ad imr.,tvennerats located in the 100-foot buffer-pane of BVW. Refer to Section 5.0 of this n,rrative for more information on proposed erosima and sedimentation control methods. 4.1 Site Preparation Site preparation will remove approximately 100,000 square feet of existing impervious area. Demolition work will comply with all federal, state and local laws. Drainage facilities from First Street that are located on-site will be re-located during site improvements. During construction, a rectangle of hay bales anchored with gravel will be placed around catch basins to IDeevent sedimentation of wetland resource areas. In order to level the site and create the desired appearance, the existing grade will be lowered by a maximum of approximately 3 feet. Misting will be necessary where ledge outcroppings arE Close to The surface and will occur in the 10Gfoot buffer z,ne to BVW in certain locations. No worx it proposed in any wetland resource arras on- site. However approximately 53,00G square feei of grading and site preparation will take place within the 100-foot buffer zone to B V�i'. Proposed facilities in the northeastern portion of the site near Highland Avenue will be located farther"1m I-VW W than existing facilities. 4.2 Apartment Construction Five apartment buildings will be constrt,t,d on the northwestem 2/3 of the site with the remaining 1/3 of the site remaining as open space for the use of the residents. The five apartment buildings will contain a total of 120 apartment units that will be serviced with off-site sewage disposal through a proposed sewage pump station and a 4-inch force main located along Firs, Street ,"Three of the apartment buildings are located within the 100-foot buffer zone to'BV W. Stormwater from the proposed impervious surfaces will be treated according to current stormwater management standards (See Sectkm VI, Stormwater Management Form). hoof runoff will be collected in roof drains and routed to dry wells to promote infiltration. 4.3 Parking Facilities and Amenities A total of 180 parking spaces will be constructed including 6 handicapped spaces. Proosed parking areas and access drives will be paved with approximately 64.300 square feet or new bituminous concrete. However, removal of existing impervious surfaces will partially m agate for proposed impervious surfaces. Overall, the project will result in a net increase in total impervious area of approximately 37,000 square feet. Stormwater from the proposed impervious Notice of Inrernr 3 Autumn Development Company,Inc. Salem MA RidgesideAparnuents r is 01/07/2000 16:58 FAX 781 982 5490 COLERd,70LANTONIO 781 982 5490 [Moos surfaces will be subject to treatment according to current stormwater management standards. whereas existing drainage Facilities are substandard and do not adequately protect wetland resource areas from impervious surface runoff. A portion of the proposed 800 square foot pool in the center of the site will be located is the 100-foot buffer zone of BVW. A clubhouse will be constructed to the west of the proposed pool, however, the clubhouse will not be located in the 100-foot buffer zone of BVW. Concrete footpaths will be constructed between buildings and facilities for pedestrian use. Approximately 2,000linear feet of concrete footpaths will be located in the 100-foot buffer zone of BVW. Approximately 80 linear feet of Versa-lok retaining wall will be installed in the 100-foot buffer zone of EtV W to the southeast of the proposed pool-' 4.4 Drainage Improvements Stormwater from proposed impervious areas will be ruanaged according to the Deparm ent .of Environmental Protection Stormwate, Management Policy (See Section VI, Stor;awater Management Form and, Appendix A .Drainage Calculations & Stormwater Operatic i and Maintenance Plan). Stormwater managaanent structures proposed include the installation rf deep sump catch basins equipped with hoods a ,low points beneath the proposed parking areas. Two Vertechnics units will be installed. to remu•ve suspended solids, oil and grease from collected stormwater. Reinforced concrete pipe and drain manholes will be installed to route stormw tter to drainage oudecs_ Roof top drainage will be collected and routed to dry wells to promote infiltration. One detention tank with a total volume of 80,000 gallons is proposed to store stormwater and E,event flooding downstream from the site. Two stormwater outlets are proposed and rip-rap will be placed at the outlet points to dissipate energy and prevent erosion from exiting treated stormwater. 4.5 Buffer Zone Planting and Site Lwidscaping Portions of the site are currently dominated by invasive plant species such as Japanese kno,weed, muldflara rose and honeysuckle. Thest�plants tend to crowd out native plant species and xF duce the wildlife habitat value of the site arty the 100-foal buffer zone to BVW. In order to improve wildlife habitat value of the 100-foot 1,.krer zone., invasive plant species will be rein e, and replaces.with native upland and wetland pisat species. Refer to Table 1 for specifics on proposed native p.':antings and values of selected speck s. Nonce oflnrene 4 Auuunn Developmew Company,Inc. Salem,MA Rldgeside Apartments 01/07/2000 16:59 FAX 781 982 5490 COI.EUCOUNTONIO 781 982 5490 1@006 Table I Values of Selected Plant S ecies* ;,, piaat nw�I e;, e�fo" hza$ata ;. " Z'aJei de. . 36ov Branches provide cover for wildlife, twigs provide food for red maple Acer rubrum FAC Good hoofed browsers, - yellow-bellied sapsucker and cardinal use sap and sce&for food. Fruit provide food for wood duck,common black gum Nyssa sylvatica PAC Good flicker,wood thrush, American robin and summer tanager Excellent Seeds and twigs river birch Betula nigm FACW (Fast growing, provide food for used for bank ruffed grouse,pine stabilization) siskin,wild turkey, hare and PorcuDine Flowers are honeybee eastcm redbud Cercis canadensis No indicator Good and bumblebee nectar source Provides cover and Amelanchier nesting for eastern serviceberry canadcnsis FAC Good kingbird,American Robin and various thrush species Seeds and twigs sweetpcpperbush C/ethra alnifolia FqC+ Good provide food avidcover for insects. small mammals and amebirds ' Provides cover and nesting for American Excellent goldfinch and food for rcd-osier dogwood Cornus sericea FACW+ (Used for bank eastern kingbird, stabilization) brown thrasher,wild turkey,ruffed grc-use, pheasant and hoofed - browsers Provides food foe wild turkey common winterb erry flex verzicithda FACW+ Good flicker,eastern bluebird and large and small mamma!-3 Notice oflntent 5 Autumn Development Company,Inc. Salem,MA Ridgeside Apa.."ents 01/07/2000 16:59 E1% 781 982 5490 MLER&COLANTONIO 781 982 5490 1@ 007 Table 1 Values of Selected Plant S eCies* �."11, .�y tiM v' 1tAn rTuauo • , O 1 4 i,tl I J. ProvidesYhiigh�ty valuable fruit fox Slue jay,black-capped Chickadee.scarlet highbush blueberry Vaeeinium FACW- Good Aga,tufted corymbosum titmouse and mourning dove and plant parts benefit red fox,skunk,derand chipmunk Provides food or Voccinium Excellent wildlife and provides lowbush blueberry FACU - (Good ground angusdfolium � ground coverht?<bitat cover species) for insects,reptiles New England and small mamr:vils. Erosion Control/Restoration Excellent(stabilizes soil) Establishes vcge la ive Mix,Dry Sites(or various species Various cover and stab]i res equivalent), I exposed soil VaIlOU$$ Ie5 'Sources Thunhorst,Gwendolyn A.,Werland Plan°ine Guide for the Northeastern United States, Environmental Concern,Inc., 1993 kdenderson,Carrol L.,Landscaoing for Wildlife,Minnesota Department of Natural Resources, 1987 Invasive plant species will be remove;t from uhe 100do0t buffer zone of BVW using b,pical mechanized vegetation clearing practio-z and/r. by hand. Herbicides will not be used for invasive„plant control during proposed improvements. Exposed soil surfaces will be stab5ized with New England Erosion Control/Restoration Mix, Dry Sites or suitable equivalent. Sending serves to stabilize exposed soil,prevent erosion and provide wildlife habitat value. Portions of the site will be planted with a variety of deciduous and evergreen trees, shrub- and ground cover herbs (See Section VIII, Project Plans). Columnar evergreens will be planted between the retaining wall and the sidewalk along First Street. Portions of the common area., will be planted with traditional turf lawn for residents to use for recreation and landscaped areas for aesthetics. Flowering landscape trees will border the entrance off First Street and a 25-foot evergreen buffer will be planted along Highland Avenue. Landscaping and proposed buffer zone improvement plantings will increase the width of the vegetated buffer between the BVW, and proposed apartment facilities. The Wetlands Protection Act and the City of Salem Wetlands Ordinance specifies wildlife habitat, storm damage protection and prevention of pollution as interests of the Act,and Ordinance to be protected. Native plantings and invasive plant removal will help improve the ability of the 100-fool buffer zone to protect the wildlif8 habitat value on-site. Plantings will stabilize areas in the 100-foot buffer zone and prevent erosion damage from stonn evens, and Notice of Intent 6 Autumn Development Company, Inc. Salem,MA Ridgeside Apartments 01/07/2000 17:00 FAX 781 882 5480 COLER&COLANTONIO 781 get 5490 � 1@ 008 plant roots will aid in the uptake and retention of nutrients and prevent pollution. The proposed project will improve existing site conditions and will enhance protection of the interests;of the Wetlands Protection Act and the City of Salem Wetlands Ordinance. 5.0 EROSION AND SEDIMENTATION CONTROLS No work is proposed in any wetland resource areas and adverse impacts to BVW will be prevented through proper installation and maintenance of erosion controls during site improvement. Erosion controls will remain in place until construction and final site stabilization are complete. 5.1 Erosion Controls Erosion controls consisting of staked hay bales and silt fence will be placed at the limits of work prior to the commencement of earth moving activities (See Section M,Figure 4). Inspection and maintenance of erosion controls will ensure proper functioning until final site stabilization is complete. - 5.2 Storm Drain Inlet Protection A rectangle of hay bales anchored with gravel will be placed around the perimeter of existing catch basins to prevent excess sediment and debris from entering existing storzawater management structures during construction(Sec Section III Figure 5). 5.3 Site Stabilization The final phase of the project is the restoration and stabilization of all exposed surfaces. Disturbed areas will be landscaped or seeded with an erosion control seed mix. Permanent restoration and revegetation measures serve to control erosion and sedimentation by establ'!.hing a vegetative cover. In the event that weather conditions prevent final restoration, temporary erosion and sedimentation measures will be employed until the weather is suitable for final cleanup. A final inspection will entire that tile project site has been permanently stabilized. Hay bales and silt fencing will not be removed until the site is stabilized and the final inspection is complete. J Notice of Intent ` 7 Autumn Development cornpan.,° Inc. Salem, MA RidgesideAparrrwntr co�� NOTICE-'OF INTENT ': F A_ Autumn Development,Company, Inc Ridgeside Apartments Salem, lViassachusetts December Submitted To: Salem Conservation Commission One Salem Green Salem, Massachusetts 01970 Submitted By: Autumn Development Company, Inc. 128/South Building 100 Grandview Road, Suite 324 Braintree, Massachusetts 02184 Prepared By: Coler& Colantonio, Inc. 101 Accord Park Drive Norwell, Massachusetts 02061 lddfl JNINNY]d WdndS or it :01 [TV OE dad e6$1 a1-AIDO]d TABLE OF CONTENTS ' Title Section tNotice of Intent (NOI) I Project Narrative H 1.0 Introduction 2.0 Existing Conditions 3.0 Wetland Resource Areas 4.0 Proposed Improvements 5.0 Erosion and Sedimentation Controls Figures III Figure 1 Locus Map Figure 2 Estimated Habitat Map ' Figure 3 Floodplain Map Figure 4 Erosion Control Detail Figure 5 Storm Drain Inlet Protection Abutter Notification and Information IV Filing Fee Information V Stormwater Management Form VI j ' Appendicies VII Appendix A: Drainage Calculations & Stormwater Operation and Maintenance Plan Appendix B: Intermittent Stream Information Appendix C: Vortechnics Reference Material Project Plans VIII r 1 Section I Notice of Intent (NOI) 1 r r r 1: r 1 r r ! 1 Massachusetts Department of Environmental Protection Bureau of Resource Protection- Wetlands DEP File Number r WPA Form 3 - Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c, 731, §40 for DEP use only Please type or print clearly all General Information information 3. Property Owner(if different from applicant): requested on this 1. Applicant: form. Vincent Potato Chip Company, Inc. Autumn Development Company, Inc. Name Name 201-205 Highland Avenue 128 S. Bldg., 100 Grandview Rd.,Suite 324 Mailing Address Mailing Address Salem Braintree Ciry/lown ciry1hown MA 01970 MA 02184 state Zip Code Stare Zip Cade (781)849-7505 4. Summary of Project Impacts: Plmne Number (781)849-7509 a. Is any work being proposed in the Buffer Zone? Fax Number(i(apokable) ❑ No $1 Yes F-Mail Address(inapplicable) If yes,how many sq.ft.? 2. Representative(if any): Approximately 53,000 square feet Coler and Colantonio, Inc. square reel Firm Chris Reichard b.List the impacts of proposed activities on each wetland ' Contact Name resource area(temporary and permanent impacts,prior to 101 Accord Park Drive restoration or mitigation): Mading Address Norwell Resource Area Size of Impact(e.g.,sq.ft.) Norwell CilyAown MA 02061-1685 Stale Zip Code (781)792-2221 Phone Number (781)982-5490 Fax Number(if applicable) creichard@col-col.com F Mail Address(tapplicable) Project Description ' 1. Project Location: 2. Registry of Deeds: Salem Essex ' Ciry/Lown county 201-205 Highland Avenue 7824, 7897,20893&4544 SVemAddress gook Map 13 Lot 4 350,391,437&437 Assessors Ma[vRat/ ParceUL0/ Page 20893 and 38811 Certificate tiLRtgislsred Land) Rev.10198 Page 1 of 5 Massachusetts Department of Environmental Protection Bureau of Resource Protection- Wetlands WPA Form 3 - Notice of Intent t Massachusetts Wetlands Protection Act M.G.L, c. 137, §40 Project Description (cont.) 3. Project Description: 4. Plan and/or map references(list title and date): Construction of residential apartments including - Ridgeside Apartments, Site Plan 11/99 bituminous parking area,drainage structures, Landscape Design Plans 11/99 a pool,clubhouse, landscaping, site preparation U.S.G.S Locus Figure, Estimated Habitat Map and ' and buffer zone improvement. A portion of the FEMA FIRM Map. proposed work is located inside the 100-foot buffer zone of bordering vegetated wetlands and bank. Activities Subject to Regulation Land Under Water Bodies: 1 1, a. If Buffer Zones to resource areas are to be impacted,in whole or in part,check the applicable resource areas: Square Feet to be altered Inland Resource Areas Coastal Resource Areas Cubic Yards to be dredged 0 Inland Bank ❑Coastal Beach Land Subject to Flooding: ®Bordering Vegetated Wetland O Barrier Beach I ' -Bordering: ❑Rocky Intertidal Shore ❑Coastal Dune Square Feet to be altered I ❑Coastal Bank cubic Yards riueda displaced ❑Salt Marsh -Isolated- b. Proposed activities located,in whole or in part,in Wetland Resource Area(s) (Complete all that apply): Square Feet to be altered Inland Resource Areas Cubic Yards rifled adisplaced Bank: Coastal Resource Areas tLinear Feel to be altered Salt Marsh: Bordering Vegetated Wetlands: Square Feet to bealtaed Square Feet to be altered Coastal Dune: ' Square Fea to be altered Square Feet to be replicated a restored Cubic Yards Volume to be removed 1 Rev.10/98 Page 2 of 5 Massachusetts Department of Environmental Protection Bureau of Resource Protection- Wetlands t WPA Form 3 - Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Activities Subject to Regulation (cont.) Land Under Ocean: ii.Width of Riverfront Area(check one): Square Fee tobealtered ❑ 25 feet- Designated Densely Developed Areas only ❑ 100 feet- New agricultural projects only Cubic Yards to be dredged 11200 feet -all other projects in.Mean annual high-water line determined by: Beach: (check all that apply) ❑ Changes in soil;vegetation;water marks;scouring Sgw,e Feet to be altered ❑ Top of bank(inland rivers) ❑First observable break in slope Rocky Intertidal Shore: ❑ Mean annual flood level ❑ Mean high tide(for coastal rivers only) Square Feel o be altered iv. Distance of proposed activity closest to the mean annual high-water line: Land Under Salt Pond: Feel Square Feet tobealtered v.Total area(square feet)of Riverfront Area on the site of the proposed project: Cubic Yards to be dredged Coastal Bank: Square Feet vi.Proposed alteration of Riverfront Area: Linear Feet to be altered Total Square Feel Designated Port Area: Square Feel within 100 B.from bank Square Feet to be altered Square Feel between,100 and200 IT from bank Land Containing Shellfish: 2. Bordering Vegetated Wetland Delineation:Explain the determination of Bordering Vegetated Wetland boundaries Square Feet tobealtered identified on plans: ❑ Final Order of Resource Area Delineation issued by Fish Run: conservation commission or DEP(attached) ❑ DEP BVW Field Data Form(attached) (irrear Feet to be altered ® Other Method of Determining BVW boundary(Check all I , Riverfront Area that apply and attach documentation): ®50%or more wetland indicator plants i. Name of waterway(if available): f]Saturated/inundated conditions exist ❑Groundwater indicators fA Direct observation A Hydric soil indicators ❑Credible evidence of conditions prior to disturbance Rev.10/98 Page 3 of 5 Massachusetts Department of Environmental Protection Bureau of Resource Protection- Wetlands f WPA Form 3 - Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 137, §40 Activities Subject to Regulation (cont.) 3.Sites Subject to Special Protection b. Is any portion of the proposed project located within an a. Is any portion of the proposed project located within Area of Critical Environmental Concern(ACEC)? estimated habitat which is indicated on the most recent Estimated Habitat Map of State-Listed Rare Wetland ❑ Yes 0 No If yes,provide name of ACEC(see Wildlife published by the Natural Heritage and Endangered Appendix D for ACEC locations): Species Program? ' ❑Yes 0 No ACEC 1997 Salem Quadrangle Dale of Map If yes, include proof of mailing or hand delivery of NO]to: Natural Heritage and Endangered Species Program c. Is any portion of the site subject to a Wetlands Division of Fisheries and Wildlife Restriction Order under the Inland Wetlands Restriction Act Route 135, North Drive (M.G.L.c. 131,s.40A)or Coastal Wetlands Restriction Act Westborough,MA 01581 (M.G.L.c. 131,s. 105)? ❑ Yes 0 No If yes,attach a copy of the Restriction Order to the NO1. ' Performance Standards b.Was the lot where the activity is proposed created prior to 1. Is any portion of the proposed activity eligible to be treated August 1, 1996? ' as a limited project subject to 310 CMR 10.24 or 310 CMR 10.53? 0 Yes ❑No ❑Yes ♦a No If yes,describe which limited project 4, a. Describe how the project will meet all performance applies to this project: standards for each of the resource areas altered,including standards requiring consideration of alternative project design or location. Attach additional sheets if necessary. Work will be limited to the buffer zone. 2. Is any activity within any Resource Area or Buffer Zone Erosion controls will prevent sedimentation of exempt from performance standards of the wetlands regulations, 310 CMR 10.00, wetlands. See Section II, Project Narrative. ❑Yes 0 No If yes,describe which exemption applies to this project: b. Stormwater Management: The project is exempt from the DEP Stormwater Policy: ❑ Yes 0 No If yes,explain why the project is exempt: I ' 3. a. Is the project located in the Riverfront Area: ❑Yes 0 No If yes,indicate the proposed project purpose: ❑Single family home ❑Residential subdivision ❑Commercial development If no,stormwater management measures are required. ,. ❑ Industrial development Applicants are encouraged to complete Appendix C: ❑Transportation Stormwater Management Form and submit it with the ❑Other-describe: Notice of Intent. Rev.10198 Page 4 of 5 1-01-1995 0. 11AM FROM VINCENTS CHIPS 9787683953 P. 2 t lbdear:NFfa+rEls efF.oeeseifrws>W PlvOperioa eared of Rlesouroe Ph%saan-1Netlsrais WPA Form 3 • Notre of Intent Aft%W, WSWS Wands WotectbrtAct M.G.L C. 731, 940 Addi(v=1 k*Muuw ApplllaR rrAtfa kiduda aM iti wilt dtsRotke of iMrm . 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For DEP. t Atnler rwdry w de PWW*V mmy ddall&lkeys"m 'we WIM d dw CWW4124 Wtcv OF iman:(Fad 3), nomwortsappimm.pwtuaat%ftraqukomoesa (a4W404fla .19plana4addocmer".mucacksof ' M,G.Le.arzattmMaase mmmAas.arlesi.Regeeawt peas,andtdAppeedlse:ma.aganrsrwra kamaJaatwr4gi yhuda aardAwnwifndtrtt prymr!tautasea,00wDEPrz9Wtalonlnfgan<'Aed 'redpt.mtpraerd!ran stvmswwh makaaf*e m.0 orhrddedawy(sse Append'aAta agtawl aeaea prw"Iftw d dwpt4wt*fAdm addnsom odrr. fl M applimd has ciwdlad S1c yes-bat in any part of Secomi C.hen 7.move.Mean vip sactrm uro ort�+siw tilts for add0wut s4 mMW rogmwwt3. ••y1 _(?�I!.[tLs,Y�.7K,EScu�:.•: fZ�19- .uanpadendcwpwsmasthe sat simultamm*.Faiefu4y MC.eWa P fA)•7o GWp l o 'ppFwn'm.md miles)hal6aayrnaMer mayna/t in aisndfsM,dthefaedodUwMw Am, ' fke.tdge Pqc m of 5 Section II Project Narrative I � 1 1 PROJECT NARRATIVE 1.0 INTRODUCTION Autumn Development Company, Inc. is proposing to redevelop the Vincent's Potato Chip site located at 201-205 Highland Avenue in Salem, Massachusetts (See Section I11, Figure 1). Proposed redevelopment of the site will include razing existing buildings, site grading and 1 cleanup and construction of apartment buildings. The site appears on City of Salem Assessor's Map 13 as lot number 4. The site is currently developed and amenities associated with the Vincent facility currently exist on-site. A portion of the proposed improvements are located in the 100-foot buffer zone of bordering vegetated wetland (BVW) and inland bank associated with an intermittent stream. 2.0 EXISTING CONDITIONS The 6.9-acre site is bordered to the north by Highland Avenue, to the west by First Street, to the east by property owned by New England Power and to the south by property owned by the Ledgemere Condominium Corporation. The southern portion of the site is characterized by un- developed open space containing ledge outcroppings. Site amenities associated with the existing Vincent Potato Chip building include a paved parking lot, loading areas and landscaped areas. Approximately 100,000 square feet of impervious surfaces currently exist on-site and approximately 139,000 square feet of the site is currently developed or disturbed. Approximately 35,300 square feet of the 100-foot buffer zone is currently developed by buildings, amenities and disturbed areas. A concrete wall approximately 480 feet in length extends along the western property line beginning at the intersection of First Street and Highland Avenue. A 12-foot wide drain easement bisects the property and a 12-inch reinforced concrete pipe (RCP) outfall is located near the center of the property adjacent to the drain easement. These drainage facilities route stormwater from First Street and existing parking facilities toward BVW located along the I eastern property boundary. Existing drainage facilities are out-dated and do not provide adequate sediment removal and protection of wetland resource areas. Approximately 340 linear feet of stone wall is located along the eastern and southern property boundary in the un-developed open space. The site is dominated by upland plant species such as multiflora rose (Rosa multiflora), wild filly- of-the-valley (Maianthemum canadense), false solomon's seal (Polygonatum biflorum), Japanese knotweed (Polygonum cuspidatum) and staghom sumac (Rhus typhina). The site is located in Zone C (Areas of Minimal Flooding) according to the Salem FIRM Map Community Panel Number 250102 0005 B (See Section III, Figure 3). According to the 1997-1998 edition of the Massachusetts Natural Heritage Atlas, there are no estimated habitats of rare wildlife or certified vernal pools on or within 100-feet of the site (See Section III, Figure 2). Based on Appendix D of the Notice of Intent (WPA Form 3), there are no Areas of Critical Environmental Concern ' (ACEC)located in the City of Salem. Notice of Intent 1 Autumn Development Company, Inc. Salem,MA Ridgeside Apartments 3.0 WETLAND RESOURCE AREAS On-site investigations were performed on April 27, 1999 to determine the presence of wetland resource areas subject to protection under the Massachusetts Wetlands Protection Act and the City of Salem Wetlands Ordinance on or within 100-feet of the site. Wetlands were delineated 1 according to the DEP Publication: Delineating Bordering Vegetated Wetlands Under the Massachusetts Wetlands Protection Act using hydric soil indicators, wetland vegetation and evidence of wetland hydrology. 1 3.1 Bordering Vegetated Wetland Two areas of BVW associated with an intermittent stream were delineated on property using blue plastic survey tape and were numbers sequentially using alphanumeric symbols. Wetland Series A contained a total of 25 flags and begins at the southeast comer of the property continuing close ' to the eastern property line to the end at the northeastern corner of the property near Highland Avenue. Wetland Series B is located at the southwestern corner of the site and contains a total of 5 flags. Wetland vegetation consisting of skunk cabbage (Symplocarpus foetidus), spotted jewelweed (Impatiens capensis), red maple (Ater rubrum), sensitive fern (Onoclea sensibilis), sweet pepperbush (Clethra alnifolia), arrow-wood (Viburnum dentatum) and highbush blueberry (Vaccinium corymbosum) provides wildlife habitat. Plant roots stabilize the soil and remove pollutants, thus providing storm / flood damage protection and pollution prevention. Wetland ' vegetation provides food and cover for a variety of species of wildlife. Certain areas of the 100- foot buffer zone have been colonized by invasive species consisting of multiflora rose, honeysuckle (Lonicera spp.) and Japanese knotweed. The invasive species have crowded out Lnative vegetation and reduced wildlife habitat value of the 100-foot buffer zone. 3.2 Intermittent Stream An intermittent stream flows to the south along the eastern property boundary. This intermittent stream is indicated on the 1985 U.S.G.S. Salem Massachusetts Quadrangle as a light blue line ' (intermittent). The stream is indicated as a first order stream on the current U.S.G.S. map and is indicated as intermittent on the Soil Survey of Essex County Massachusetts, Sheet Number 11. Water does not flow in a well-defined channel for the entire length of the stream and there is no Zone A floodplain associated with the stream on the Salem FIRM Map Community Panel Number 250102 0005 B (See Section III, Figure 3). The watershed size has been estimated from the U.S.G.S. map to be approximately I square mile. Portions of the stream do not have a well- defined channel and the bottom material is thick and organic in sections. No water control structures or U.S.G.S. stream gauges were identified. This stream did not appear on the Massachusetts Stream Classification Program: Inventory of Rivers and Streams, 1982 (Re-printed 1984). No fish were observed during our site investigations. The mapped resources and collected information/data indicate that this stream is intermittent(See Section VII, Appendix B). 3.3 Bank tThe portion of the land surface abutting and confining the water of the intermittent stream is classified as the bank wetland resource area. The upper boundary of the bank is located at the first observable break in slope between the stream channel and BVW. The lower boundary of the bank is at the break in slope at the low point in the streambed. The intermittent stream bank acts to control flooding during times of heavy rain. Vegetation on the bank and in adjacent BVW Notice of Intent 2 Autumn Development Company, Inc. Salem, MA Ridgeside Apartments t consisting of highbush blueberry, red maple and arrow-wood prevents storm damage and pollution and provides wildlife habitat. 4.0 PROPOSEDIMPROVEMENTS The proposed project will improve existing conditions on-site. Landscaping will improve aesthetics, invasive plant removal will improve wildlife habitat, drainage upgrades will treat ' sormwater and protect wetland resource areas and residential development will result in reduced impacts as compared to the previous commercial use of the site. Portions of the proposed improvements are located in the 100-foot buffer zone of BVW and bank (See Section VIII, Project Plans). No work will take place in BVW or on bank and erosion and sedimentation controls installed at the limits of work will prevent adverse impacts to wetland resources during construction and until the site is stable (See Section III, Figure 4). No adverse impacts to BVW are anticipated as a result of the proposed improvements located in the 100-foot buffer zone of BVW. Refer to Section 5.0 of this narrative for more information on proposed erosion and sedimentation control methods. 1 4.1 Site Preparation Site preparation will remove approximately 100,000 square feet of existing impervious area. Demolition work will comply with all federal, state and local laws. Drainage facilities from First Street that are located on-site will be re-located during site improvements. During construction, a rectangle of hay bales anchored with gravel will be placed around catch basins to prevent ' sedimentation of wetland resource areas. In order to level the site and create the desired appearance, the existing grade will be lowered by a maximum of approximately 3 feet. Blasting will be necessary where ledge outcroppings are close to the surface and will occur in the 100-foot buffer zone to BVW in certain locations. No work is proposed in any wetland resource areas on- site. However approximately 53,000 square feet of grading and site preparation will take place within the 100-foot buffer zone to BVW. Proposed facilities in the northeastern portion of the ` site near Highland Avenue will be located farther from BVW than existing facilities. 4.2 Apartment Construction Five apartment buildings will be constructed on the northwestern 2/3 of the site with the remaining 1/3 of the site remaining as open space for the use of the residents. The five apartment buildings will contain a total of 120 apartment units that will be serviced with off-site sewage 1 disposal through a proposed sewage pump station and a 4-inch force main located along First Street. Three of the apartment buildings are located within the 100-foot buffer zone to BVW. Stormwater from the proposed impervious surfaces will be treated according to current sormwater management standards (See Section VI, Stormwater Management Form). Roof runoff will be collected in roof drains and routed to dry wells to promote infiltration. 4.3 Parking Facilities and Amenities A total of 180 parking spaces will be constructed including 6 handicapped spaces. Proposed I parking areas and access drives will be paved with approximately 64,300 square feet of new bituminous concrete. However, removal of existing impervious surfaces will partially mitigate for proposed impervious surfaces. Overall, the project will result in a net increase in total impervious area of approximately 22,000 square feet. Stormwater from the proposed impervious Notice of Intent 3 Autumn Development Company, Inc. ' Salem,MA Ridgeside Apartments surfaces will be subject to treatment according to current Stormwater management standards, whereas existing drainage facilities are substandard and do not adequately protect wetland resource areas from impervious surface runoff. A portion of the proposed 800 square foot pool in the center of the site will be located in the 100-foot buffer zone of BVW. A clubhouse will be constructed to the west of the proposed pool, however, the clubhouse will not be located in the ' 100-foot buffer zone of BVW. Concrete footpaths will be constructed between buildings and facilities for pedestrian use. Approximately 2,000 linear feet of concrete footpaths will be located in the 100-foot buffer zone of BVW. Approximately 80 linear feet of Versa-lok retaining wall ' will be installed in the 100-foot buffer zone of BVW to the southeast of the proposed pool. 4.4 Drainage Improvements Stormwater from proposed impervious areas will be managed according to the Department of Environmental Protection Stormwater Management Policy (See Section VI, Stormwater Management Form and, Appendix A Drainage Calculations & Stormwater Operation and Maintenance Plan). Stormwater management structures proposed include the installation of deep sump catch basins equipped with hoods at low points beneath the proposed parking areas. Two Vortechnics units will be installed to remove suspended solids, oil and grease from collected stormwater. Reinforced concrete pipe and drain manholes will be installed to route stormwater to drainage outlets. Roof top drainage will be collected and routed to dry wells to promote infiltration. One detention tank with a total volume of 80,000 gallons is proposed to store stormwater and prevent ' flooding downstream from the site. Three stormwater outlets are proposed and rip-rap will be placed at the outlet points to dissipate energy and prevent erosion from exiting treated stormwater. 4.5 Buffer Zone Planting and Site Landscaping I ' Portions of the site are currently dominated by invasive plant species such as Japanese knotweed, multiflora rose and honeysuckle. These plants tend to crowd out native plant species and reduce the wildlife habitat value of the site and the 100-foot buffer zone to BVW. In order to improve wildlife habitat value of the 100-foot buffer zone, invasive plant species will be removed and replaced with native upland and wetland plant species. Refer to Table I for specifics on proposed ' native plantings and values of selected species. I � Notice of Intent 4 Autumn Development Company, Inc. ' Salem, MA Ridgeside Apartments Table 1 Values of Selected Plant Species* v `F ;' r> Indicator Stabilization'; ;PoteiitW Wildlife`-4 Plant Latin Name r3'a �,.�,.�� x ,,.� ,. Status°#r 'Valuer as4<' S.i Waluew�,= ^_ Branches provide cover for wildlife, twigs provide food for red maple Acer rubrum FAC Good hoofed browsers, yellow-bellied sapsucker and cardinal use sap and seeds for food. Fruit provide food for wood duck,common black gum Nyssa sylvatica FAC Good flicker, wood thrush, I , American robin and summer tanager Excellent Seeds and twigs (Fast growing, provide food for river birch Betula nigra FACW used for bank ruffed grouse,pine stabilization) siskin, wild turkey, hare and porcupine ' Flowers are honeybee eastern redbud Cercis canadensis No indicator Good and bumblebee nectar source Provides cover and Amelanchier nesting for eastern serviceberry canadensis FAC Good kingbird, American Robin and various ' thrush species Seeds and twigs provide food and sweet pepperbush Clethra alnifolia FAC+ Good cover for insects, small mammals and amebirds Provides cover and nesting for American Excellent goldfinch and food for red-osier dogwood Corpus sericea FACW+ eastern kingbird, g (Used for bank brown thrasher, wild stabilization) turkey,ruffed grouse, pheasant and hoofed browsers Provides food for wild turkey,common winterberry Ilex verticillata FACW+ Good flicker,eastern ' bluebird and large and small mammals Notice of Intent 5 Autumn Development Company, Inc. Salem,MA Ridgeside Apartments I , 1 Table 1 Values of Selected Plant Species* i 2Paant fl LatrmName Indicatory k Stab�hzaGoni s Poterittal Wildlife r FNtattis =W' ,;Value,�'�' Value Provides highly valuable fruit for blue jay,black-capped chickadee,scarlet l highbush blueberry Vaccinium FACW - Good tanager,tufted corymbosum titmouse and mourning dove and plant parts benefit red fox,skunk,deer and chipmunk Provides food for ' Vaccinium Excellent wildlife and provides lowbush blueberry FACU - (Good ground ground cover habitat angustifolium cover species) for insects,reptiles 1 and small mammals. New England Erosion Control/Restoration Excellent Establishes vegetative ' Mix,Dry Sites(or Various species Various (stabilizes soil) cover and stabilizes equivalent), exposed soil various species ' *Sources Thunhorst,Gwendolyn A.,Wetland Planting Guide for the Northeastern United States, Environmental Concern,Inc., 1993 ' Henderson,Carrot L.,Landscaping for Wildlife,Minnesota Department of Natural Resources, 1987 Invasive plant species will be removed from the 100-foot buffer zone of BVW using typical mechanized vegetation clearing practices and/or by hand. Herbicides will not be used for invasive plant control during proposed improvements. Exposed soil surfaces will be stabilized with New England Erosion Control/Restoration Mix, Dry Sites or suitable equivalent. Seeding serves to stabilize exposed soil, prevent erosion and provide wildlife habitat value. ' Portions of the site will be planted with a variety of deciduous and evergreen trees, shrubs and ground cover herbs (See Section VIII, Project Plans). Columnar evergreens will be planted between the retaining wall and the sidewalk along First Street. Portions of the common areas will be planted with traditional turf lawn for residents to use for recreation and landscaped areas for aesthetics. Flowering landscape trees will border the entrance off First Street and a 25-foot evergreen buffer will be planted along Highland Avenue. Landscaping and proposed buffer zone improvement plantings will increase the width of the vegetated buffer between the BVW and ' proposed apartment facilities. The Wetlands Protection Act and the City of Salem Wetlands Ordinance specifies wildlife habitat, storm damage protection and prevention of pollution as interests of the Act and Ordinance to be protected. Native plantings and invasive plant removal will help improve the ability of the 100-foot buffer zone to protect the wildlife habitat value on-site. Plantings will stabilize areas in the 100-foot buffer zone and prevent erosion damage from storm events and Notice of Intent 6 Autumn Development Company, Inc. Salem, MA Ridgeside Apartments plant roots will aid in the uptake and retention of nutrients and prevent pollution. The proposed project will improve existing site conditions and will enhance protection of the interests of the ' Wetlands Protection Act and the City of Salem Wetlands Ordinance. 5.0 EROSION AND SEDIMENTATION CONTROLS No work is proposed in any wetland resource areas and adverse impacts to BVW will be ' prevented through proper installation and maintenance of erosion controls during site improvement. Erosion controls will remain in place until construction and final site stabilization are complete. ' 5.1 Erosion Controls ' Erosion controls consisting of staked hay bales and silt fence will be placed at the limits of work prior to the commencement of earth moving activities (See Section III, Figure 4). hispection and maintenance of erosion controls will ensure proper functioning until final site stabilization is complete. 5.2 Storm Drain Inlet Protection ' A rectangle of hay bales anchored with gravel will be placed around the perimeter of existing catch basins to prevent excess sediment and debris from entering existing stormwater management structures during construction (See Section III, Figure 5). ' 5.3 Site Stabilization The final phase of the project is the restoration and stabilization of all exposed surfaces. Disturbed areas will be landscaped or seeded with an erosion control seed mix. Permanent restoration and revegetation measures serve to control erosion and sedimentation by establishing ' a vegetative cover. In the event that weather conditions prevent final restoration, temporary erosion and sedimentation measures will be employed until the weather is suitable for final cleanup. A final inspection will ensure that the project site has been permanently stabilized. Hay ' bales and silt fencing will not be removed until the site is stabilized and the final inspection is complete. Notice of Intent 7 Autumn Development Company, Inc. Salem, MA Ridgeside Apartments ' Section III ' Figures 1 r i 1 1 1 �• ,I _ APPRORIMATE SITEi 1 P` lei LOCUS \dYY�kkjp�pl((��1tl .� t USGS Salem Quadrangle ' nT 1:25,000 Series COLER & Rid eside Apartments FIGURE 1 II , 9 P COLANTON1O2 Salem, Massachusetts Locus Map ENGINEERS AND SCIENTISTS 1 �1 �,lq�Yl rM f �' 'a ,t•! iu `I 1 _ `l{�i ty �i S � 'a�na�g+_ r �,'T 't '�' r .SY'} Y '1 i S r r 1•••f- trg : tI <8 s :a�J r7j�x t ir' , �"�' Fr sN'`• s >E,. F�i w., CL Ary N 'C R Yr� � x r ] i .!� _�'r a x� 11. •yF c,. 1 z i W N r2 1CC D .E _ r,... ..f ry ir.`• Ftti� _ r i r S '`y`'� LU A t F• � r f �.�-�'r 5k jj h IcINA4 �bs A A ji Ja # k 4 `l4'R�)!Y•' r ¢ N N +x� ,� ,•l I { r �•� � -. 11 rF Zj wr ¢ w ,g .d ?� N N ¢ N E � • � � lip,� ) a T r I I a^!r I ��° lr�,C a � y`, - '-2 • � � � S ! J {.. ,Ir ✓��-�•7 �� a N i � i T F '9 A /� S �• l if I l^.'C n ` .a -r` {r t�. ,t �M��h 9`t,"°1eee,,,��,��a f r � r •�r�1 Y ` j ss t F �i} �/ c. � f/) 07'br 1t --� r. 1 •Ss SPLe ' @7 +�5; / 'd ! 'e oz w •. ! 1,.,� s� �S i cif _ t�tax �r a+ r 3s 't f 1 4 �xc`x.�� a rn d � y t x ,�, a Igr' e �ilS!4` r ff• •� {� lsai4 .i d( �f - �llCx �: O ran aft [ ✓ . � • _ f Mr �q �t V 7 �rti>r r� �r ? s m a = WC w Sid a OIL rcw 111 IlC • u' + �9, ° io��'! 1 k r. lj E.I t`�`°5 y> Fr 9 r - i r �'� le`•s�+ , F' n.y k -cc a N _j J` �y ✓m ° jji e{ i r r rl(!^I}4�r MINE. �t,b;t7JJ}�a� Sh11x4S ��x��.i e � � b , � .✓+� + r y t;+n" ro,(0, ... �Ca �eiA�-f1i ?d�� i 4 +'�' uv i N 1 II , ' f APPROXIMATE SITE LOCUS 4y r -- 11 l Salem FIRM Map 1 Community Panel # !/ 250102 0005 B COLER (AIL Ridgeside Apartments FIGURE 3 COLANTONI02 Salem, Massachusetts Floodplain Map ENGINEERS AND SCIENTISTS 1 SILT FENCE Woven wire fence (min. 14.5 gauge, 6" max mesh spacing) Securely fastened to post with ties or staples. Filter-fabric fastened over mesh Amoco 1380 or equivalent. HAY BALE WOOD OR STEEL POST Use 2 ea. hardwood stakes per Post length: 36" minimum hay bale, driven 6" into ground Drive into ground: 18" minimum Staked bales end to end Locate each post: 10' maximum on center For wood post use 2"x2" hardwood For steel post use "T" Type WORK AREA WETLAND -' Direction of Flow Trench Place minimum of 8" of filter fabric in trench, backfill and tamp COLER & Figure 4 COLANTONIO � Ridgeside Apartments Erosion Control ENGINEERS AND SCIENTISTS Salem, Massachusetts Detail 1 PLAN VIEW IT BASIN GRATE 1 N.T.S. 1 BAYES TO OVERLAP CORNERS BALED HAY OR 1 s STRAW WRAPPED BALES TO BUTT WITH TWINE TOGETHER 1 A A 1 1 w 1 PLACED CHRUSHED STONE 1 OR GRAVEL BERM u A; AROUND HAYBALES 1 SECTION A-A BALED HAY OR N.T.S. STRAW WRAPPED 1 WITH TWINE CRUSHED STONE EXISTING CATCH OR GRAVEL BASIN 1 T BITUMINUS 1 4 MIN. PAVEMENT 1 NOTES: t. SURROUND STREET DRAINAGE STRUCTURE INLET WITH HAY BALES PRIOR TO CONSTRUCTION AND MAINTAIN UNTIL CONSTRUCTION IS COMPLETED. ACCUMULATED 1 SEDIMENTS SHALL BE REMOVED. 2. 4" MIN. GRAVEL BERM AROUND BOTTOM OF HAYBALES. 1 Figure 5 COLER Ridgeside Apartments 1 COLANTONIO � Salem, Massachusetts Storm Drain ENGINEERS AND SCIENTISTS Inlet Protection � 1 t ' Section IV ' Abutter Notification and Information 1 1 1 1 1 1 1 � 1 1 Affidavit of Service ' Under the Massachusetts Wetlands Protection Act (to be submitted to the Massachusetts Department of ' Environmental Protection and the Conservation Commission when filing a Notice of Intent) I, Chris Reichard ,hereby certify under the pains and penalties of perjury that on 12130/95 I gave notification to abutters in compliance with the second paragraph of Massachusetts General Laws Chapter 131, Section 40, and the DEP Guide to ' Abutter Notification dated April 8, 1994, in connection with the following matter: ' A Notice of Intent filed under the Massachusetts Wetlands Protection Act by Autumn Development with the Conservation Company,Inc. Salem Commission on 1213ol g9 for property located 201-205 Highland Avenue The form of the notification, and a list of the abutters to whom it was given and their addresses, are attached to this Affidavit of Service. Name Date I 1 Notification to Abutters Under the Massachusetts Wetlands Protection Act ' In accordance with the second paragraph of the Massachusetts General Laws Chapter 131, Section 40, you are hereby notified of the following. ' A. The name of the applicant is Autumn Development Company,Inc. B. The applicant has filed a Notice of Intent with the Conservation Commission for the Municipality ' Salem seeking to remove,fill,dredge or alter an Area Subject to Protection Under the Wetlands Protection Act(General Laws Chapter 131, Section 40). ' Activities Proposed: Construction of apartment buildings including paved driveways, walkways, landscaping and drainage/stormwater management improvements located partially within the 100-foot buffer zone to bordering vegetated wetland and inland bank. ' C. The Address of the Lot where the activity is proposed is 201-205 Highland Avenue Salem,MA 01970 D. Copies of the Notice of Intent may be examined at Salem Conservation Commission between the hours of 8:OOAM and 4:OOPM on the following days of the week: M,T, W,F 8:OOAM 7:OOPM Th For more information,call: (978)745.9595 extension 31 ' Check one:This is the applicant ❑,representative ❑,or other R1 (specify): Town Name of Representative: Coder& Colantonio,Inc. ' E. Copies of the Notice of Intent may be obtained from either(check one)the applicant ❑ or the applicant's representative 0 by calling this telephone number (781)792-2221 between the hours of 9 AM and 5 PM on the following days of the week: M—F F. Information regarding the date,time,and place of the public hearing may be obtained from: Salem Conservation Commission by calling this telephone number (978)745-9595 between the hours of 8:00 AM and 4:00 PM on the following days of the week: M-F Check one: This is the applicant El,representative ❑,or other Z(specify): Conservation Commission NOTE:Notice of the public hearing,including its date,time and place, will be published at least five (5)days in advance in the Salem Evening News ' (name of newspaper) NOTE: Notice of the public hearing, including its date, time and place, will be posted in the City or Town Hall not less than forty-eight(48)hours in advance. NOTE: You also may contact your local Conservation Commission or the nearest Department of Environmental Protection Regional Office for more information about this application or the Wetlands Protection Act. ' To contact DEP call Central Region: SOS-792-7650 Northeast Region:978-661-7600 Southeast Region: 508-946-2700 Western Region: 413-784-1100 BOARD OF ASSESSORS CITY HALL PAGE: v {' SALEM, MA 01970 DATE 11/24/99 ' CERTIFIED ABUTTERS LIST (' SUBJECT PROPERTY: MAP: 13 LOT: 0004 SUFF:. ' - PROPERTY ADDRESS: 0201 HIGHLAND AVENUE 205 ('' _ASSESSED._4WNER_. .: ._VINCENT_.POTATO CHIP. CO. INC____. MAP LOT SUFF PROPERTY ADDRESS ASSESSED OWNER _. MAILING_ADDRESS.. 13 0003 814 00.13EFIRST STREET U13A2 ROLLINS FREDERICK L 13E FIRST STREET 013A2 ....... _. .. ._ ._ ...._ _......... . ._.... ._.. __. ..._....._..__SALEM..MA 01970 ._......__ _...__,. _ .. 13 0003 81.5 0013BFIRST STREET U13B.1 MACDONALD iOHN A 13B FIRST ST U13B1 MAC.DONALD BARBARA A SALEM MA 01970 '. 13 0003 816 0013FFIRST STREET U13B2 LANES SCOTT 13F FIRST ST U13B2 LANES LAIIRA SALEM MA 01970 13 0003 8.17 00.13CFIRST STREET 013C1 APPLIN KIMBERLY A 13C FIRST ST 1113 Cl '. _.___.._MAGIIIRE..MICHAEL..A _ . __.. . _ _ SALEM..MA 0197.0 _ 13 0063 818 0013G'FIRST STREET U13C2 FRITZ SHEILA A 13G FIRST ST 1113C2 ' FRITZ MICHAEL J SALEM MA 01.970 .. 13 0003 819 0013DFIRST STREET 1113D1 STRAINGE HERBERT H JR 13 FIRST STREE 13-D1 STRAINGE ALICE S SALEM MA 01970 13 0003 820 0013HFIRST STREET 013D2 MISERANDINO MARTIN 13H FIRST ST 013D2 {. _.._- - SALEM MA 01.97.0. . - __...__... _-.....___ ._....__.. 13 0003 821 6015AFIRST STREET U15A1 ZLOCIIEVSKY ALEXANDER 15A FIRST STREET 1115-A1 BELETSKAYA ALLA M SALEM MA 01970 ! 13 0003 622 0015EFIRST STREET 1115A2 . . - WHITMORE DAVID T 15E FIRST. ST U15-.A2.. . . ... WHITMORE MELISSA SALEM MA 01970 13 0003 823 001.5BFIRST STREET U15B1 THIBAULT MICHAEL J 15BFIRST ST 1I3-1 { ' _...... -.. __ _..._. _ _.. ..__ _. ._... .._._._........... ...._..__T.HIBAULT__HEDWIG...A -_. .. _._ _ __..__ .__.SALEM MA.. _01970 - ._..._.._._ 13 0003 824 0015FFIRST STREET U1552 MILLETT MARIO J 15F FIRST STREET U15B2 - SALEM MA 01970 m 13 0003 825 0015CFIRST. STREET. 1115C1 ... CLARK FRANK J. 15C FIRST.ST 11C-1.- CLARK NORMA A SALEM MA 01970 13 0003 826 0015GFIRST STREET 1115C2 STAVIS BETTY. 0 15G FIRST ST 1115C2 _._._,-._._____—MARTINELLI...ANNE_E_.__.._.._._-_..—_ .__.._____._.SALEM-MA._019.20_. 13 0003 827 0015DF'IRST STREET U15D1 MAILHOT WILLIAM J 15D FIRST STREET U15-DI 0 MAILHOI'T HELEN E SALEM MA 01970 _ ].3..0003 82}3U91,'iHF.IRST_..S.TREET._II,L.502__._.._... .. ._...__._.FAFARD..MADLYN A..... ._._. ._ ..... _. .__ ._.29.0 ELIOT ST...... ._. _.-_.__..__. ._____._ .. ASHLAND MA 01721 FRANK KIILIK ,F nurev ncecceno .. . t - -BOARD OF-ASSESSORS - -- - -- ', CITY HALL --' SALEM MA 01970 PAGE: ............... _...._.__... CERTIFIED ABUTTERS LIST ..__. .......... SUBJECT PROPERTY: -.._ ._ .....MAP: 13 LOT: 0004 S[IFF: PROPERTY ADDRESS: 0201 HIGHLAND AVENUE 205 ASSESSED OWNER VINCENT POTATO CHIP CO INC ._..._ _ .. ... . ' - MAP LOT SLIFF PROPERTY ADDRESS ASSESSED OWNER MAILING ADDRESS 13 0004 0201 HIGHLAND AVENUE 205 VINCENT POTATO CHIP CO INC P 0 BOX 3004 . :.:.._ .. .. '._. _.-. .._ _ _...SALEM MA 01970 _ 13 0005 0199 tIIGFILAND AVEN[IE - NEW ENGLAND POWER CO 25 TBOROUGH MA 01E ATT PROPERTY TAX DEFT WESTIIOROIIGFI MA 01581 If a'. 13 0006 0010 FIRST STREET 12 PEQUOT II LIMITED PARTNERSHIP 6 FANEUIL HALL MARKET PLACE a.. .__ .... .__.._....__ _.._-.. BOSTON MA 02109 1 13 0001 0204 F[IGHLAND AVENUE (CART ROBERT J 38 DEPOT ROAD KART MARY JANE STRATHAM N H 03885-2_100 13 0002 U2U7 HIGHLAND AVENUE - HILLCREST REALTY TRUST __..._.._.___...._ . 107 BRIMBAL AVE CERUNDULO RALPH TR BEVERLY MA 01915 13 U013 0208 HIGHLAND AVENUE KART ROBERT J 204 HIGHLAND AVENUE (CART MARY JANE SALEM MA 01970 13 0012 0209 HIGHLAND AVENUE HILLCREST REALTY TRUST 107 BRIMBAL AVE CERIINDUL0 RALPH TR BEVERLY MA.01915 ,. 13 0003. 801 0007AFIRST STREET UlA DINERMAN JOSEPH 7A FIRST ST [IlA 13 0003 802 00078FIRST STREET U18 DINERMAN MARY F SALEM MA 01970MIRKOVICH BOGDAN 7B FIRST ST U.1B SALEM MA 01970 I ' 13 0003 803 0007CFIRST STREET CISC ZINNA ANTHONY J 7C FIRST ST UIr_ _.l _ SALEM. MA 01970 _ 13 0003 �804 0007UFIHST STREET UD 1HOMPSON FAMILY REALTY 7`R[ISTSTREET 1601 DERRICK 7`t1OMF'SON DORIS/TFIOMPSON JO EIN SR TEN HOLIDAY FLORIDA 34690 13 0003 805 0009AFIRST STREET [12A CONNOLLY ALBERT 11 9A FIRST ST U2A CONNOLLY KATHLEEN P SALEM MA 01970 13 0003 806 00096FIRST .STREET U2B SACCO BERNARD P 9B FIRST ST U23 -- ...._13 0003.. 807 00 SALEM MA 0197009C FIRST STREET li2C HILL MARY M - .. _. _.. _.. .. - . . .--._..._. ..._... ._...__..: 9C FIRST STREET L12C. I + 13 0003 808 0009DFIRST STREET L12D SALEM MA 01970 GILMAN JOAN L 9D FIRST ST U2D _ SALEM MA 0 13 0003 809 0011AFIRST STREET [13A PLIRDY I<ATIILEEN M 1.1A FIRST ST ST t1[13A _._ SALEM MA 01970 "-13 0003 810 00118FIRST'STREET Li3B.. .. . BRIDGES HEATHER. M _ _. _ __._...._.. .._._ ...._.__....i 118 FIRST STREET I13B SALEM MA 01970 �; 13 0003. 811 0011CFIRST STREET 113C ABATI CHARLES J 11C FIRST ST U3C ABATI DINA - - - - SALEM MA 01970 - - - 13 0003 812. UOIIDFIRST STREET U3D hIICCICHE SAL,VATORE A 11D FIRST ST U30 MICCICHE EVFLYN C SALEM MA 0.1970 _...- a 6UO3 "dl-3 60 3AF RsT._. ... _.... . _ _...... __ _ ..... ...__....... ._. ._ _ .._._....... .. $9'REET [113A1 HUGHES HELEN E TR 13A FIRST ST 613A1 H[IG}IES HF:f,EN T SALEM MA 01970 , - FRANK NULIK CHIEF ASSESSOR Y ' Section V Filing Fee Information 1 1 I ' CALCULATED FILING FEE STATEMENT ' The proposed project is included in Category 3 b, construction of each building for any commercial, industrial, or apartmenUcondominium/townhouse-type development, any ' part of which is in a buffer zone or resource area. Any activities associated with the construction of said building, including associated site preparation and construction of retention/detention basins, septic systems, parking lots, utilities, point source discharges, package sewage treatment plants, and roadways and driveways other than those roadways reviewable under 310 CNM 10.53 (3) (e), shall not be subject to additional fees if all said activities are reviewable under a single Notice of Intent. ' The fee for Category 3 b is $525.00 for each building. There are three apartment buildings located within the 100-foot buffer zone to BVW. The total fee for the project is $1,575.00. ' The City of Salem portion of the fee is $1,575/2 plus $12.50 = $800.00 The State portion of the fee is $1,575/2 minus $12.50 = $775.00 The City of Salem has no additional local NOI filing fees. 1 Massachusetts Department of Environmental Protection Bureau of Resource Protection— Wetlands WPA Appendix B - Wetland Fee Transmittal Form Massachusetts Wetlands Protection Act M.G.L. c. 731, §40 Please type or print clearly all U Instructions information' 1. To calculate filing fees, refer to the category fee lists and 2. To the conservation commission:Send the Notice of Intent,forrmested on this examples in Section D of this form.Complete pages 1 and Abbreviated Notice of Intent,or Abbreviated Notice of 2 of this form and send these pages and a check or money Resource Area Delineation;a copyof pages 1 and 2 of this order for the state share of the fee,payable to the Com- form;and the city/town fee payment. ' monwealth of Massachusetts, to: 3. To DEP regional office(see Appendix A for addresses): Dept.of Environmental Protection Send the Notice of Intent,Abbreviated Notice of Intent,or Box 4062 Abbreviated Notice of Resource Area Delineation;a copyof ' Boston, MA 02211 pages 1 and 2 of this form;and a copyof the state fee payment. Applicant/Property Owner Information 1. Applicant: 2. Property Owner: Autumn Development Company, Inc. Vincent Potato Chip Company, Inc. Name Name 128 S. Bldg., 100 Grandview Rd.,Suite 324 201-205 Highland Avenue Mailing Address Mailing Address Braintree Salem Cirylhown Citylemn MA 02184 MA 01970 Slate Zip Code Stale Zip Code (781)849-7505 (781)593-4422 extension 228 Phone Number Phone Number 3. Project Location: 201-205 Highland Avenue, Map 13, Lot 4 ' SmeerrLal Number Salem CityAown Fees Note:See Abbreviated Notice of Resource Area Delineation: examples of how to calculate The fee is calculated as follows(check applicable project type): wetland filing fees ' in Section D. ❑ single family house project x$1.00= ' (feet of BVW) Total fee(not to exceed$100) O all other projects x$1,00= (feet of BVW) Total fee(not to exceed$1,000) ' State share of filing fee: Cityrrown share of filing fee: (112 of total fee minus$12.50) (112 of total fee plus$12.50) ' Rev.10/98 Page 1 of 4 ' Massachusetts Department of Environmental Protection ' Bureau of Resource Protection- Wetlands WPA Appendix 6 - Wetland Fee Transmittal Form ' Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Fees (cont.) rNote:See Abbreviated Notice of Intent or Notice of Intent: examples of how to calculate The fee should be calculated using the following six-step process and worksheets wetland filing fees in Section D. Step 1/Type of Activity: Describe each type of activity(see Section D for a list of activities)which will occur in a wetland resource area and buffer zone. Step 2/Number of Activities: Identify the number of each type of activity. Step 3/Individual Activity Fee: Identify the fee associated with each type of activity using the six categories of projects and fees listed in Section D of this form. Step 4/Subtotal Activity Fee:Multiply the number of activities(identified in Step 2)times the fee per category(identified in Step 3)to reach a subtotal fee amount. Note: If any of these activities are in a riverfront area in addition to another resource ' area or the buffer zone,the fee per activity should be multiplied by 1.5 and then added to the subtotal amount. Step 5/Total Project Fee:Determine the total fee for the project by adding the subtotal amounts identified in Step 4. ' Step 6/Fee Payments:To calculate the state share of the fee,divide the total fee in half and subtract$12.50.To calculate the city/town share of the fee, divide the total fee in half and add$12.50, 1 Step 1/Type of Activity Step 2/Number Step 3/Individual Step 4/Subtotal of Activities Activity Fee Activity Fee Category 3b,apartment/condominium-type development 3 $525.00 $1,575.00 i r r Step 5/Total Project Fee: $1,575.00 ' Step 6/Fee Payments: $1,575.00 Total Project Fee: ' (Total fee from Step 5) State share of filing fee: $775.00 City/Town share of filing fee: $800.00 (1/2 of total fee minus$12.50) (1/2 of total fee plus$12.50) Rev.1 0/96 Page 2 of 4 x Yi.yY "r kYix? f. .I AUTUMN DEVELOPMENT COMPANY, INC. cmzENBeANK of MASSACNUSETTB i BOSTON MA ;: 100 QRANDVIEW RD STE.324 - , 'BRAINTREE'}MR0218a _ 5a017/2770 $,*****800 .00 s 'PAY TO THE` CITY OF SALEM ORDER OF ***************** R Eight Hundred and 00/100 DOLLARS DOLLla indo -- ••pateiislle on bad. U ~ FILING FEE CON COM, 205 HIGHLAND MEMO m 11100 208811' 1: 2 L L070 L751: L LO L0904 L011' AUTUMWDEVELOPMENTCOMPANY,INC. CMZENS BANK OF- 20$9 x �100.ORANDVIEW'RD.;STE.324 MASSACNUSETTS a"BRAINTREE;MA-02184 BOSTON MA ,�;. eS-ao�nreiio i65 PAYTOTHE COMMONWEALTH OF 'MASSACHUSETTS ORDER OF - ,� Seven Hundred Seventy-Five and 00/100******************.**************** DOLLARS, BeadiV fealum - e IrcAULeG:. _ Oetalls on back. n MEMO FILING FEE,205 HIGHLAND,SALEM 11100 208911' is 2 L L0 ?0 L 751: 1 0 L0904 1010 Section VI Stormwater Management Form 1 Massachusetts Department of Environmental Protection ' Bureau of Resource Protection- Wetlands WPA Appendix C - Stormwater Management Form ' Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Please type or print clearly all Instructions ' nformation requested on this The Department of Environmental Protection(DEP)recom- demonstrate how equivalent water quality and water quantity fie". mends that applicants submit this form,as well as supporting protection will be provided.DEP encourages engineers to use documentation and plans,with the Notice of Intent to provide this form to certify that the project meets the stormwater ' stormwater management information for conservation management standards as well as acceptable engineering commission review consistent with the wetland regulations standards.For more information,consult the Stormwater (310 CMR 10.05(6)(b))and DEP's Stormwater Management Management Policy.(Note:this September 7998 version of the Policy(March 1997). If a particular stormwater management Stormwater Management Form supersedes earlier versions, standard cannot be met, information should be provided to including those contained in DEP's Stormwater Handbooks.) t Project Information ' 1.The proposed project is: 3. List all plans and documents(e.g.,calculations and New development PI Yes ❑ No additional narratives)submitted to supplement this form: Redevelopment ❑ Yes ❑ No ' Combination redevelopmentmew development 1. Storm Runoff Analysis, Ridgeside Apartments, ❑ Yes ❑ No Salem, MA, 12/17/99. (If combination project,distinguish redevelopment components from new development components on ' the project plans.) 2. Site Development Plans,Ridgeside Apartments, 2. Stormwater runoff volumes to be treated for water quality Salem, MA, 12/27/99. are based on the following calculations:(check one): ' ❑ 1 inch of runoff x total impervious area of post- development site for discharge to critical areas(Outstand- ing Resource Waters,recharge areas of public water I supplies,shellfish growing areas,swimming beaches,cold water fisheries). IV 0.5 inches of runoff x total impervious area of post- development site for other resource areas. Stormwater Management Standards ' DEP's Stormwater Management Policy(March 1997)includes nine standards that are listed below.Check the appropriate boxes for each standard and provide documentation and additional information when applicable. ' Standard#1: Untreated stormwater Standard#3: Recharge to groundwater la The project is designed so that new stormwater point Amount of impervious area(sq.ft.)to be infiltrated: discharges do not discharge untreated stormwater into,or 37,000 sf. cause erosion to,wetlands or waters. Standard#2: Post-development peak discharge rates Volume to be recharged is based on: ❑ Not applicable-project site contains waters subject to tidal Lq the following U.S.Natural Resources Conservation action. Service(MRCS)hydrologic soil groups(e.g.,A,B,C,D,or Post-development peak discharge rates do not exceed pre- UA)or any combination of groups: development rates on the site at the point of discharge or 100 C downgradient property boundary for the 2-year and 100-year, (%olimp—ous area) (Hydrologic scilgroup) ' 24-hour storms. ❑ without stormwater controls (%Wimpevlous area) tHydrologicsoagroup/ LK with stormwater controls designed for the 24-hour, 2-year and 10-year storms (%cdimpervious area) (Hyrcaologic soil group) M The project's stormwater design will not increase offsite or Flooding impacts from the 100-year,24-hour storm. Rev.10198 Page 1 of 3 Massachusetts Department of Environmental Protection ' Bureau of Resource Protection- Wetlands WPA Appendix C - Stormwater Management Form ' Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Stormwater Management Standards (cont.) ' ❑ Site-specific pre-development recharge rate and volume are and Standard#5: Higher potential pollutant loads were determined as follows: Does the project site contain land uses with higher potential N/A pollutant loads?(See Stormwater Policy Handbook-Volume 1, page 1-23,for land uses of high pollutant loading.) ❑ Yes IV No If yes,describe land uses: N/A List each BMP or non-structural measure proposed to be ' utilized to infiltrate stormwater to meet Standard#3(e.g.,dry Identify BMPs which have been selected to treat stormwater well,infiltration trench): runoff.If infiltration measures are proposed,describe the pre- treatment. (Note:if the area of higher potential pollutant 1. Drywells for infiltration of new roof runoff. loading is upgradient of critical area, infiltration is not ' allowed.) N/A ' The annual groundwater recharge for the post-development site approximates the annual recharge from existing site conditions. W Yes ❑ No ' Standard#6:Protection of critical areas Standard#4: 80%TSS Removal Will the project discharge to or affect a critical area? 0 The proposed stormwater management system will remove (See Stormwater Policy Handbook-Volume 1,page 1-25. 80%of the post-development site's average annual Total for critical areas.) Suspended Solids(TSS)load. ❑ Yes IV No Identify the BMPs proposed for the project and describe how If yes,describe areas: the 80%TSS removal will be achieved: 1. Source Control(10%). N/A 2. Deep sump catch basins(25%). Identity BMPs selected for stormwater discharges in these 3. Vortechs Treatment Chamber(80%). areas and describe how BMPs meet restrictions listed on pages 1-27 and 1-28 of the Stormwater Policy Handbook-Volume 1: N/A ' If the project is redevelopment,explain how much TSS will be removed and briefly explain why 80%removal cannot ' be achieved. N/A Rev.10/98 Page 2 of 3 Massachusetts Department of Environmental Protection ' Bureau of Resource Protection— Wetlands . WPA Appendix C - Stormwater Management Form ' Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Stormwater Management Standards (cont.) ' disturbance. ' Standard#7: Redevelopment projects Is the proposed activity a redevelopment project? Standard#9: Operation/maintenance plan ❑ Yes R No 2 An operation and maintenance plan for the post-develop- ment stormwater controls has been developed.The plan Note:components of redevelopment projects which plan to includes ownership of the stormwater 3MPs,parties develop previously undeveloped areas do not fall under the responsible for operation and maintenance,schedule for scope of Standard 7. inspection and maintenance,routine and long-term maintenance responsibilities,and provision for appropriate If the activity is a redevelopment project,the following access and maintenance easements extending from a public stormwater management standards have been met: right-of-way to the stormwater controls. N/A See NOI Filing for 12/28/99 Plar✓ritle Date ' Ridgeside Apartments, Salem, MA Plawritle Date ' Signatures: I� The following stormwater standards have not been met for the Roy Tiano,H.W. Moore Assoc., Inc. ' following reasons: A ppli�of orApplicant,Representative Name N/A B ✓ �2.r�.f> A natue ' Project Manager lit rifle 12/28/99 Date N(The proposed project will reduce the annual pollutant load ' on the site with new or improved stormwater controls. Standard#8: Erosion/sediment control ' V Erosion and sediment controls are incorporated into the project design to prevent erosion,control sediments,and stabilize exposed soils during construction or land 1 tRev.10/98 Page 3 of 3 1 Section VII ' Appendices 1 1 1 1 1 Appendix A: Drainage Calculations & Stormwater Operation 1 and Maintenance Plan 1 1 1 it 1 1 1 1 1 1 1 1 1 1 it ICI 1 ' STORM RUNOFF ANALYSIS ' AND DRAINAGE MAINTENANCE PLAN RIDGmDE APARTMENTS SALEM, MASSACHUSETTS 1 PROPOSED RESIDENTIAL DEVELOPMENT 1 DECEMBER 17, 1999 1 6 ' H.W.MOOBE ASSOCIATES,INC. Comutring Engineers 112 SHAWMUT AVENUE BOSTON,MA 02118 1 TABLE OF CONTENTS RIDGESIDE APARTMENTS ' SALEM,MA DECEMBER 17, 1999 ' PROJECT DESCRIPTION.........................................................................:....:.........................:.....1 ExistingConditions..............................................................................................................1 ' Proposed Project..................................................................................................................1 DRAINAGE CONCEPT........................................................ ....... ............... ....................................I Figure1 —Locus Map..............................................................................................2 Figure2 —NRCS Soils Map....................................................................................3 WATERSHEDS...............................................................................................................................4 ExistingConditions..............................................................................................................4 ProposedConditions............................................................................................................4 SOILS :.............................................................................................................................................5 ' RECHARGE TO GROUNDWATER.............................................................................................5 WATERQUALITY.........................................................................................................................5 CALCULATIONS...........................................................................................................................6 Table I —Stormwater Runoff Summary..................................................................6 Table 2—Stormwater Runoff Summary by Watershed...........................................7 SILTATION CONTROL PROCEDURES......................................................................................7 ' DRAINAGE MAINTENANCE PLAN...........................................................................................7 SUMMARY AND CONCLUSIONS ..............................................................................................8 APPENDICES 1. EXISTING CONDITIONS 2. PROPOSED CONDITIONS 3. RATIONAL PIPE DESIGN 4. DRY WELL CALCULATIONS ' 5. STANDARD#3 —RECHARGE TO GROUNDWATER 6. VORTECHS STORMWATER TREATMENT SYSTEM ' 1845-,,.-12-17-99 d. STORM RUNOFF ANALYSIS RIDGESIDE APARTMENTS ' SALEM,MA DECEMBER 17, 1999 PROJECT DESCRIPTION tExistine Conditions 1 The project site consists of approximately 6.25t acres of land located on the south of Highland Avenue (Route 107) in Salem, MA. The site is bordered by Highland Avenue to the north, First Street and commercial development to the west, a New England Power Company transmission line and Salem High School to the east, and the Ledgemere Condominiums to the south. Refer to [Figure 1] for the USGS locus plan of the project site. The existing site contains a mostly vacant structure with bituminous parking and access drives occupying approximately half of the site. An adjacent automobile dealership occupies a small portion of the existing site building on a temporary basis. The remaining half of the site consists ' of undeveloped brush and woodland area with scattered ledge outcroppings. An intermittent brook flows in a southerly direction along the eastern border of the site and has a wetland resource area associated with it. ' Elevations on-site range from a high of 104t along the southwestern comer of the site to a low of 76t along the eastern border. Site topography is generally sloping west to east with moderate to steep gradients around the southern portion of the site. A review of the soil survey conducted by the United States Department of Agriculture Natural Resources Conservation Service (USDA NRCS) indicates Chatfield—Hollis—Rock Outcrop Complex and Urban Land as the primary soil on-site. The Chatfield—Hollis—Rock Outcrop Complex is located within the undeveloped portion of the site and Urban Land is found primarily within the developed area of the site. Refer to [Figure 21 for the NRCS Soils Map of the project site and for the hydrologic soil group classification of the soils. ' Proposed Project 1 The proposed project consists of the construction of a multi-unit residential development along with necessary access driveways, parking areas, utility systems and infrastructure. 1 DRAINAGE CONCEPT The scope of this drainage study includes the review of storm water runoff generated from the ' existing conditions, as well as the expected runoff that the proposed development might generate, along with appropriate mitigation measures. ' 1845-na-12-1]-99.dac 'v a F �! •� ,. .. 2y 3h ,K ' a>w-_> `d:. m .+ .. 4 � b"' ... .- _ � .lei f• 4 «3 Y A �PSnd �� ;�� Gir��i/�� l �� " � � ��Q' S� •.: r� rM f Y+`k ' . t f ��J f �i 15� { 4� � '�iY l�i.` `3C. \ f •.; a I `M t SITE rgi 1000 — ---- --- -- Meters 1000 0 10M W W 6m mm 10 am Feet USGS QUADRANGLES: SALEM,MASSACHUSETTS)1985) LYNN,MASSACHUSETTS(1985) A Pi FIGURE 1 LOCUS MAP H.W.MOORE ASSOCIATES,INC. SCALE: DATE: 1122FJ9 RIDGESIDE APARTMENTS CONSULTING ENGINEERS 1 in.=2,000 ft. JOB#: 1845 ' SALEW MA BOSTON,MA FILE#: locusl.xls leastoo"l we • � �. Sh4 >� •�1 Y� ,j / Y I o��f � �, • ;•,,,�;�."' )C1 Jr t�� O `•` � `S' 16 7 Q p J u- i' ♦ 1t ip4, Lm l I a' ,�ti., ♦ o r r,i1 rli .i � O '�vl I , r a ' t;``4Nf _ .•t�(' qf !- •I� � ,' � i . �•.4�vRu 1L1 V, BYx , t 4 •'t> c t 1 � _.'fir � ,.� p.. In 4 •r Plf�♦,�,�iwt,f•;?( l'.t I c��'� 1. t Atli f. F l.i i 1 H W uj "h � 1�• 1. t I .rl. :Y ja �,/Y y V V' m t.?'4.:y ri tlt •S'ti!-4`Y{t�Y'Nr.�„fy`7 ., . I.F _ �' t t � �«i !. 1 r *'�.•...i "f• ? �.r w j 0 O .. tl 1 h"` b` � 'sit' s�.'`�ri`' . t Att1 b' J �:%y• 4 •. f�Q ° tti�y, 2 ��$+. z � x ✓yW�jp"}�v� v r��'}.I• t l i•' � /�+�� 1 i� � r i ��y'�l� - . l i �� 4 t�7�� , n. 'f". J .�Il �'� �'" 4 1f ' � •.: ~ 3,h f o �1. ` � taf i t o z i \ � •a n. a III 13 .O (1•.. •H'• a r � Il � �� a r�+� 8 �.,' li t�?'� i'« , 'R'b w y I 1: � .z n Q4 A f of •• \ ._JO ._ O 2 w 10 In a. w I t• 1 t, • y0 :. �� C.." 2� •. YV r at♦ �Y. � y U � Z ?( N ON �� yr• u fvSsvlg �L. LLl Storm Runoff Analysis December 17, 1999 Ridgeside Apartments ' Page 4 This study utilizes the USDA NRCS publication TR-55, which is considered standard methodology and customary for this application. This runoff methodology uses soil type, time of concentration(Tc), vegetative cover and topographical conditions to construct hydrographs for pre-selected storm events. In this case, hydrographs were developed to simulate storm runoff flows for existing and proposed conditions for the 2-year, 10-year and the 100-year storm events. These calculations indicate the order-of-magnitude of existing and proposed peak flows anticipated from the relevant portions of the project site. tWATERSHEDS The site has been divided into several watersheds based on drainage patterns to analyze the stormwater runoff from the existing and proposed conditions. Only analysis of the proposed development area was conducted since undisturbed areas would retain their pre-development ' runoff characteristics. Existing Conditions 1 I. Watershed Al comprises 2.29 acres located along the northern half of the site and includes all of the existing bituminous parking and drive areas as well as building roof ' area. Uncontrolled runoff from this watershed drains overland in an easterly direction to an existing wetland resource area. 2. Watershed A2 comprises 2.10 acres located along the southern portion of the site and includes undeveloped brush and woodland areas with scattered rock outcroppings. ' Uncontrolled runoff from this watershed drains overland in an easterly direction to an existing wetland resource area. Refer to the Existing Watershed Plan appended to the report. Proposed Conditions ' I. Watershed Al comprises 2.42 acres located along the northern, southern and western borders of the site and includes some roof area, bituminous parking and drive areas as well as some landscaped areas. Runoff from this watershed is collected in the proposed pipe system and conveyed into the subsurface Detention Tank Al before discharging to the existing wetland resource area. 2. Watershed A2 comprises 1.97 acres centrally located on-site and contains primarily roof and landscaped areas, as well as most of the cement concrete walkways. Runoff from roof area is collected in the proposed pipe system and conveyed to the existing wetland ' resource area. Runoff from most of the lawn and concrete walks drain overland to the existing wetland resource area. Refer to the Proposed Watershed Plan appended to the report. ' Attenuation of peak runoff rates from the project site has been provided through an on-site stormwater detention system. Storm runoff from Watershed Al will be conveyed through the ' 1645-sn-I2-❑-99.doc Storm Runoff Analysis December 17, 1999 Ridgeside Apartments ' Page 5 proposed pipe system into the proposed subsurface Detention Tank Al centrally located on-site. This detention tank has been sized to accommodate stormwater runoff from the 100-year event. ' Runoff will discharge though a 10-inch diameter control orifice within a drainage control structure (DCS A1) at a reduced, predetermined rate, eventually draining into the existing ' wetland receiving area located along the eastern border of the site. SOILS ' A review of the United States Department of Agriculture,Natural Resources Conservation Service, Soil Survey of Essex County, Massachusetts Southern Part indicates Chatfield - Hollis —Rock Outcrop Complex and Urban Land as the primary soils on-site. Chatfield—Hollis—Rock Outcrop Complex is on undulating and rolling ridges and hills. It consists of well-drained, moderately deep Chatfield soils; somewhat excessively drained, shallow Hollis soils; and exposed bedrock. These soils and areas of exposed bedrock are intermingled so closely that it was not practical to separate them at a scale used for mapping. As a unit, these soils have a hydrologic soil group classification CID. Urban Land is so altered or obscured by urban works or structures that classification is not possible. This soil is unclassified. RECHARGE TO GROUNDWATER According to the Department of Environmental Protection's (DEP) Stormwater Management ' Policy, post-development groundwater recharge rates should equal pre-development rates based upon the increase in net impervious area and the hydrologic soil group classifications of the on- site soils. Currently, the developed half of the existing site is essentially impervious area,while the undeveloped half of the site consists of poorly drained soils (hydrologic group C/D) with scattered ledge outcroppings and moderate to steep gradients. These existing site conditions would provide for a negligible groundwater recharge rate, making post-development mitigation unnecessary. For this project, however, new roof runoff will be directed into pre-cast concrete drywells for ' infiltration into the underlying soils,thereby providing recharge rates equal to or greater than existing conditions. According to the DEP Stormwater Management Policy, roof runoff is considered clean and therefore requires no pre-treatment before infiltrating. WATER QUALITY ' The addition of 3.05f acres of impervious area(including 1.21f acres of roof area)may serve to slightly increase the amount of Total Suspended Solids (TSS) in the stormwater runoff. Roof related runoff is considered clean and requires no pretreatment, so only treatment of parking area ' related runoff is necessary. To ensure compliance with the DEP Stormwater regulations, all parking lot runoff collected in ' IBaS-sre-1]-I].9q.doc ' Storm Runoff Analysis December 17, 1999 Ridgeside Apartments ' Page 6 the proposed drain system will be routed though proprietary treatment chambers manufactured by Vortechnics. These treatment devices (Vortechs models 3000 and 4000) are comprised of three ' internal chambers which act as a grit chamber, oil chamber and flow control chamber. Within the grit chamber, the swirling motion created by the tangential inflow directs settleable solids toward the center. The oil chamber and flow control chamber traps oily pollutants up and out of the effluent stream, while simultaneously reducing the forces which may cause re-suspension and washout. These treatment devices will remove at least 80% of the TSS in the stormwater runoff before the runoff discharges into the existing wetland resource area. All proposed catch basins will be equipped with 4-ft. deep sumps and oil trap hoods to further increase the TSS removal from the stormwater runoff. ' CALCULATIONS Analysis of the on-site piping system was conducted using the Rational Method and 10-year and ' 25-year design storms. The calculations indicate the "order-of-magnitude"of peak runoff rates under existing and ' proposed conditions for the 2-year, 10-year and 100-year storm event recurrence interval. As can be seen, there is a reduction in the peak rate of runoff discharging from the site for the storm events under proposed conditions, and therefore, there will be no adverse effect on the watershed ' or its environs. [Table 1] summarizes the calculated peak runoff rates for the total site, and [Table 2] summarizes the calculated peak runoff rates for the individual site watersheds, indicating complete mitigation. TABLE 1 STORMWATER RUNOFF SUMMARY STORM EVENT EXISTING PEAK RATE PROPOSED PEAK RATE (cfs) (cfs) 2-YEAR 8 8 ' 10-YEAR 13 12 100-YEAR 20 17 *** • 0%net reduction ' •• 8%net reduction 15%net reduction ' IBAS-sa-12-I]-99.doc ' Storm Runoff Analysis December 17, 1999 Ridgeside Apartments ' Page 7 TABLE 2 PEAK STORMWATER RUNOFF SUMMARY BY WATERSHED 0 v v 9 ` . W O O E O O O k. E i E m > 0 °c u9 `v 1 oai oU c o c co oU UU o u o o o j UU U oo cuc doCo E g o U 3 a z a a a a a a 3 x — a a a a 6 a Ac. Hr. cis cis cfs Ac. Hr. cis cis cis ' AI 2.29 97 0.11 11 10 1 [A2 2.42 94 0.10 14 7 10 5 6 4 A2 2.10 74 0.20 5 3 I 1.97 88 0.10 10 7 4 ' 4.39 20 13 8 4.39 17 12 8 ' SILTATION CONTROL PROCEDURES Downslope areas will be protected through the installation of a combination of staked hay bales ' and filter fabric fence to be located along the perimeter and/or elsewhere as required to protect and stabilize earthworks. All embankment slopes will be fine graded and stabilized by means of wood chip mulch, shrubs, sod and/or seed and mulch as is appropriate and consistent with the landscaping plan. All pipe drains and catch basins will be installed early in the construction period in order to provide early control of site runoff. Crushed stone will be judiciously applied to stabilize select areas, as required, during the course of construction. DRAINAGE MAINTENANCE PLAN ' The site shall be maintained by the project owner to provide a stabilized, maintained surface thereby preventing excess materials from contacting surface runoff and minimizing transport of materials within the drain system. In that regard, the following program is proposed. 1 On an Annual Basis: ' • Inspect all drainage structures including catch basins, manholes and inlets and note any deficiencies, remove any obstructions to flow, make any necessary repairs. • Clean all catch basin sumps by an independent licensed contractor. Remove all ' accumulated sediment and floatable debris for lawful offsite disposal. • Clean the on-site detention tank of accumulated materials. 1945-.-12-17-99.do ' Storm Runoff Analysis December 17, 1999 Ridgeside Apartments ' Page 8 On a Semi-Annual Basis: • Parking lots will be swept by appropriate means to remove accumulated silts and sediments from the surface of paved ways. This work is best accomplished in early ' spring, following deposition of winter deicing materials, but prior to spring wet weather period, and in the fall. On a Monthly Basis: ' • Provide proper policing of grounds to remove and deleterious surface materials including ground litter. ' • Maintain vegetation by cutting lawns and trimming landscaped areas. Remove all clippings from the site and provide for lawful disposal. • Police the dumpster area and ensure proper containment of waste material As Needed: • Stabilize or repair any exposed earthworks resulting from site maintenance. • Clean up any spills or material deposits resulting from landscape operation or ongoing ' site activities. SUMMARY AND CONCLUSIONS ' Significant attention and consideration has been given to proper management of storm water runoff from the project site. The unique specific site characteristics and hydrologic setting has been carefully studied to develop a comprehensive plan that fully utilizes and recognizes these attributes. Disposition of storm water has been considered, with respect to its peak rate, total volume and water quality aspects, to ensure successful runoff mitigation upon project ' completion. • There will be no adverse impact to any surrounding areas. ' • The drain system has been properly designed to handle the design flow rates. • Decreased TSS as compared to existing conditions. ' 1845-sn-12-IJ-99.doc 1 1 ' , E?XISTING CONDITIONS RUNOFF CURVE NUMBER COMPUTATION Version 2 . 10 ' Project : RIDGESIDE APARTMENTS User: TNU Date: 11-15-199 ' County : ESSEX State: MA Checked: Date : Subtitle : EXISTING CONDITIONS Subarea : Al ' ------------------------------------------------ --- Hydrologic Soil Group COVER DESCRIPTION A B C D Acres (CN) ------------------------------------------------------------------------------- ' FULLY DEVELOPED URBAN AREAS (Veg Estab. ) Open space (Lawns,parks etc . ) Good condition; grass cover > 751 - - . 05 (74) . 04 (80) ' Impervious Areas Paved parking lots, roofs, driveways - - 1 . 1 (98) 1 . 1 (98) Total Area (by Hydrologic Soil Group) 1 . 15 1 . 14 ------------------------------------------------------------------------------- SUBAREA: Al TOTAL DRAINAGE AREA: 2 . 29 Acres WEIGHTED CURVE NUMBER: 97 ----------------------------------------- ------------------- 1 1 ' RUNOFF CURVE NUMBER COMPUTATION Version 2 . 10 ' Project : RIDGESIDE APARTMENTS User: TNU Date: 11-15-19S County : ESSEX State: MA Checked: Date : ' Subtitle : EXISTING CONDITIONS Subarea : A2 ------------------------------------------------------------------------ ------- ' Hydrologic .Soil Group COVER DESCRIPTION A B C D Acres (CN) ' --------------------------------- --------------------------------------------- OTHER AGRICULTURAL LANDS Woods good - 1 . 05 (70) 1 . 05 (77) ' Total Area (by Hydrologic Soil Group) 1 . 05 1 . 05 ------------------------------------------------- ------------------------------ SUBAREA: A2 TOTAL DRAINAGE AREA: 2 . 1 Acres WEIGHTED CURVE NUMBER: 74 --------------------------------------------- ------------------------ ' TIME OF CONCENTRATION AND TRAVEL TIME Version 2 . 10 ' Project : RIDGESIDE APARTMENTS User: TNU Date : 11-15-1991 ' County : ESSEX State: MA Checked: Date : Subtitle: EXISTING CONDITIONS ------------------------------- Subarea #2 - A2 ------------------------------- ' Flow Type 2 year Length Slope Surface n Area Wp Velocity Time rain (ft) (ft/ft) code (sq/ft) (ft) (ft/sec) (hr) --------------------------------------------------------------------- ---------- Sheet 3 . 1 50 . 070 H 0 . 127 Shallow Concent 'd 190 . 037 U 0 . 017 Shallow Concent 'd 45 . 2 U 0 . 002 Time of Concentration = 0 . 15* ' --- Sheet Flow Surface Codes --- ' A Smooth Surface F Grass, Dense Shallow Concentrated _-_ ___B Fallow (No Res . ) G Grass, Burmuda Surface Codes C Cultivated < 20 o Res. H Woods, Light P Paved D Cultivated > 20 1 Res . I Woods, Dense U Unpaved E Grass-Range, Short J Range, Natural ' * - Generated for use by TABULAR method I ' ' TABULAR HYDROGRAPH METHOD Version 2 . 10 ' Project : RIDGESIDE APARTMENTS User: TNU Date : 11-15-199s County : ESSEX State: MA Checked: , Date: Subtitle: EXISTING CONDITIONS Total watershed area: 0 . 007 sq mi Rainfall type: III Frequency: 100 years ' -------------------------- Subareas -------------------------- Al A2 Area (sq mi) 0 . 00* 0 . 00* Rainfall (in) 6 . 5 6 . 5 Curve number 97* 74* Runoff (in) 6 . 14 3 . 61 Tc (hrs) 0 . 10 0 . 15* 1 (Used) 0 .10 0 . 20 TimeToOutlet 0 . 00 0 . 00 Ia/P 0 . 01 0 . 11 (Used) 0 .10 0 . 11 Time Total ------------- Subarea Contribution to Total Flow (cfs) ------------ (hr) Flow Al A2 ' 11 . 0 1 1 0 11 . 3 1 1 0 11 . 6 2 1 1 ' 11 . 9 5 4 1 12 . 0 7 5 2 12 . 1 12 9 3 ' 12 . 2 20P 15P 5 12 .3 19 12 7P 12 .4 14 8 6 ' 12 . 5 10 6 4 12 . 6 7 4 3 12 . 7 5 3 2 12 . 8 4 2 2 13 . 0 3 2 1 13 . 2 2 1 1 13 .4 2 1 1 13 . 6 2 1 1 13 . 8 2 1 1 14 . 0 2 1 1 14 .3 2 1 1 14 . 6 2 1 1 ' 15 . 0 1 1 0 15. 5 1 1 0 16 . 0 1 1 0 ' 16 . 5 1 1 0 17 . 0 0 0 0 17. 5 0 0 0 18 . 0 0 0 0 19 . 0 0 0 0 20 . 0 0 0 0 22 . 0 0 0 0 ' 26 . 0 0 0 0 t TABULAR HYDROGRAPH METHOD Version 2 . 10 Project : RIDGESIDE APARTMENTS User: TNU Date : 11-15-199 County : ESSEX State : MA Checked: Date : ' Subtitle: EXISTING CONDITIONS Total watershed area: 0 . 007 sq mi Rainfall type : III Frequency: 10 years -------------------------- Subareas -------------------------- Al A2 Area (sq mi) 0 . 00* 0 . 00* Rainfall (in) 4 . 5 4 . 5 Curve number 97* 74* Runoff (in) 4 . 15 1 . 97 Tc (hrs) 0.10 0 . 15* ' (Used) 0 . 10 0 .20 TimeToOutlet 0 . 00 0 . 00 Ia/P 0 . 01 0 . 16 ' (Used) 0 . 10 0 . 16 Time Total ------------- Subarea Contribution to Total Flow (cfs) ------------ (hr) Flow Al A2 ' 11 . 0 0 0 0 11 . 3 1 1 0 11. 6 1 1 0 ' 11 . 9 4 3 1 12 . 0 5 4 1 12 . 1 7 6 1 ' 12 . 2 13P lop 3 12 .3 12 8 4P ' 12 .4 8 5 3 12 . 5 6 4 2 12 . 6 5 3 2 12 . 7 3 2 1 1 12 . 8 2 1 1 13 . 0 2 1 1 13 . 2 2 1 1 13 .4 1 1 0 13 . 6 1 1 0 13 . 8 1 1 0 ' 14 . 0 1 1 0 14 . 3 1 1 0 14 . 6 1 1 0 ' 15 . 0 1 1 0 15 . 5 0 0 0 16 . 0 0 0 0 ' 16 . 5 0 0 0 17 . 0 0 0 0 17 . 5 0 0 0 ' 18 . 0 0 0 0 19 . 0 0 0 0 20. 0 0 0 0 22 . 0 0 0 0 26 . 0 0 0 0 II ' TABULAR HYDROGRAPH METHOD Version 2 . 10 ' Project : RIDGESIDE APARTMENTS User: TNU Date: 11-15-199< ' County : ESSEX State: MA Checked: Date : Subtitle: EXISTING CONDITIONS Total watershed area: 0 . 007 sq mi Rainfall type: III Frequency: 2 years ------------------------ Subareas ------- ------------- Al A2 Area (sq mi) 0 . 00* 0 .00* Rainfall (in) 3 . 1 3 . 1 Curve number 97* 74* Runoff (in) 2 . 76 0 . 97 Tc (hrs) 0 . 10 0 . 15* ' (Used) 0 . 10 0 .20 TimeToOutlet 0 . 00 0 . 00 Ia/P 0 . 02 0 .23 (Used) 0 . 10 0 . 23 Time Total ------------- Subarea Contribution to Total Flow (cfs) ------------ (hr) Flow Al A2 ' 11 . 0 0 0 0 11 . 3 0 0 0 11 . 6 1 1 0 11 . 9 2 2 0 12 . 0 2 2 0 12 . 1 5 4 1 12 . 2 8P 7P 1 12 . 3 7 5 2P ' 12 . 4 4 3 1 12 . 5 4 3 1 12 . 6 3 2 1 12 . 7 2 1 1 12 . 8 1 1 0 13 . 0 1 1 0 13 . 2 1 1 0 13 .4 1 1 0 13 . 6 1 1 0 13 . 8 1 1 0 14 . 0 0 0 0 14 .3 0 0 0 14 . 6 0 0 0 1 15 . 0 0 0. 0 15 . 5 0 0 0 16 . 0 0 0 0 16 . 5 0 0 0 17 . 0 0 0 0 17 . 5 0 0 0 ' 18 . 0 0 0 0 19 . 0 0 0 0 20 . 0 0 0 0 22 . 0 0 0 0 ' 26 . 0 0 0 0 1 1 1 1 i 1 1 1 1 PROPOSED CONDITIONS 1 1 1 1 1 1 ' RUNOFF CURVE NUMBER COMPUTATION Version 2 .10 Project : RIDGESIDE APARTMENTS User: TNU Date : 12-16-195 1 County : ESSEX State : MA Checked: Date : Subtitle : PROPOSED CONDITIONS Subarea : Al ----------------------------------------- -------------------- ' Hydrologic Soil Group COVER DESCRIPTION A B C D Acres (CN) ------------------------------------------------------------------------------- ' FULLY DEVELOPED URBAN AREAS (Veg Estab. ) Open space (Lawns,parks etc. ) Good condition; grass cover > 75% - - . 22 (74) .21 (80) ' Impervious Areas Paved parking lots, roofs, driveways - - 1 . 00 (98) 0 . 99 (98) Total Area (by Hydrologic Soil Group) 1 . 22 1 .2 --- ------------------------------ ----------------------------- ' SUBAREA: Al TOTAL DRAINAGE AREA: 2 .42-Acres WEIGHTED CURVE NUMBER: 94 -------- --------------------- - i ' RUNOFF CURVE NUMBER COMPUTATION Version 2 . 10 Project : RIDGESIDE APARTMENTS User: TNU Date: 12-16-199S ' County : ESSEX State : MA Checked: Date: Subtitle: PROPOSED CONDITIONS Subarea : A2 --------------------------------------------- ' Hydrologic Soil Group COVER DESCRIPTION A B C D Acres (CN) ------------------------------- --------------------------- -------------- FULLY DEVELOPED URBAN AREAS (Veg Estab. ) Open space (Lawns,parks etc . ) Good condition; grass cover > 751 - - .46 (74) .45 (80) ' Impervious Areas Paved parking lots, roofs, driveways - - 0 . 53 (98) 0 . 53 (98) Total Area (by Hydrologic Soil Group) . 989 . 98 -------------------- ------------------ -------------------- ------- ' SUBAREA: A2 TOTAL DRAINAGE AREA: 1_97 Acres WEIGHTED CURVE NUMBER: 88 III 1 I , I , 1 ' TIME OF CONCENTRATION AND TRAVEL TIME Version 2 . 10 Project : RIDGESIDE APARTMENTS User: TNU Date: 12-16-199 County : ESSEX State : MA Checked: Date: Subtitle: PROPOSED CONDITIONS ------------------------------- Subarea #1 - Al ----------------------------- -- ' Flow Type 2 year Length Slope Surface n Area Wp Velocity Time rain (ft) (ft/ft) code (sq/ft) (ft) (ft/sec) (hr) ------------------------------------------------------------------------------- Sheet 3 . 1 60 . 023 A 0 . 013 Shallow Concent 'd 100 . 014 P 0 . 012 Open Channel 940 3 0 . 087 Time of Concentration = 0 . 11* --- Sheet Flow Surface Codes --- A Smooth Surface F Grass, Dense __- Shallow Concentrated ___ B Fallow (No Res. ) G Grass, Burmuda Surface Codes C Cultivated < 20 °s Res . H Woods, Light P Paved D Cultivated > 20 o Res . I Woods, Dense U Unpaved ' E Grass-Range, Short J Range, Natural ' * - Generated for use by TABULAR method ' TABULAR HYDROGRAPH METHOD Version 2 .10 ' Project RIDGESIDE APARTMENTS User: TNU Date : 12-16-199 County ESSEX State: MA Checked: Date : ' Subtitle : PROPOSED CONDITIONS Total watershed area: 0 . 007 sq mi Rainfall type : III Frequency: 100 years -------------------------- Subareas -------------------------- Al A2 Area (sq mi) 0 . 00* 0 . 00* Rainfall (in) 6 . 5 6 . 5 Curve number 94* 88* Runoff (in) 5 . 79 5 . 11 Tc (hrs) 0 . 11* 0 . 10 ' (Used) 0 . 10 0 . 10 TimeToOutlet 0 . 00 0 . 00 Ia/P 0 . 02 0 . 04 (Used) 0 . 10 0 . 10 Time Total ------------- Subarea Contribution to Total Flow (cfs) ------------ (hr) Flow Al A2 11 . 0 1 1' 0 11 . 3 2 1 1 11 . 6 2 1 . 1 ' 11 . 9 7 4 • 3 12 . 0 9 5 , 4 12 . 1 16 9 7 12 . 2 24P 14P ' lop 12 .3 20 12 • 8 12 .4 13 8 - 5 12 . 5 10 6 • 4 12 . 6 7 4 • 3 12 . 7 5 3 2 ' 12 . 8 4 2 2 13 . 0 3 2 ' 1 13 .2 2 1 1 13 .4 2 1 1 13 . 6 2 1 1 13 . 8 2 1 1 14 . 0 2 1 1 14 . 3 2 1 1 14 . 6 2 1 1 ' 15 . 0 2 1 1 15 . 5 2 1 1 16 . 0 1 1 0 16 . 5 1 1 • 0 17 . 0 0 0 0 17 .5 0 0 0 18 . 0 0 0 0 19 . 0 0 0 0 20 . 0 0 0 0 22 . 0 0 0 0 26 . 0 0 0 0 TABULAR HYDROGRAPH METHOD Version 2 . 10 ' Project : RIDGESIDE APARTMENTS User: TNU Date : 12-16-199 County : ESSEX State: MA Checked: Date : Subtitle : PROPOSED CONDITIONS Total watershed area: 0 . 007 sq mi Rainfall type: III Frequency: 10 years ' ------------------------ Subareas ----------------- --- Al A2 Area (sq mi) 0 . 00* 0 . 00* ' Rainfall (in) 4 . 5 4 . S Curve number 94* 88* Runoff (in) 3 . 82 3 .20 Tc (hrs) 0 . 11* 0 . 10 (Used) 0 . 10 0 . 10 TimeToOutlet 0 . 00 0 . 00 Ia/P 0 . 03 0 . 06 (Used) 0 . 10 0 . 10 Time Total ----------- -- Subarea Contribution to Total Flow (cfs) ------------ (hr) Flow Al A2 11 . 0 0 0 ' 0 11 . 3 1 1 0 11 . 6 2 1 1 11 . 9 4 2 2 12 . 0 5 3 2 12 . 1 10 6 4 ' 12 . 2 17P lop 7P 12 . 3 13 8 . 5 ' 12 . 4 8 5 • 3 12 . 5 7 4 • 3 12 . 6 5 3 ' 2 12 . 7 3 21 1 ' 12 . 8 2 1 • 1 13 . 0 2 1 1 13 . 2 2 1 1 ' 13 .4 2 1 1 13 . 6 2 1 1 13 . 8 2 1 1 ' 14 . 0 1 1 0 14 . 3 1 1 0 14 . 6 1 1 0 ' 15 . 0 1 1 • 0 15 . 5 0 0 0 16 . 0 0 0 0 ' 16 . 5 0 0 0 17 . 0 0 0 0 17 . 5 0 0 0 I , 18 . 0 0 0 0 19 . 0 0 0 0 20 . 0 0 0 0 22 . 0 0 0 0 26 . 0 0 0 0 ' TABULAR HYDROGRAPH METHOD Version 2 . 10 ' Project RIDGESIDE APARTMENTS User: TNU Date: 12-16-199 ' County ESSEX State: MA Checked: Date : Subtitle : PROPOSED CONDITIONS Total watershed area: 0 . 007 sq mi Rainfall type : III Frequency: 2 years ' ------ --- Subareas----- ------------ A1 A2 Area (sq mi) 0 . 00* 0 . 00* ' Rainfall (in) 3 . 1 3 . 1 Curve number 94* 88* Runoff (in) 2 .45 1 . 91 Tc (hrs) 0 . 11* 0 . 10 (Used) 0 .10 0 . 10 TimeToOutlet 0 . 00 0 . 00 Ia/P 0 . 04 0 . 09 (Used) 0 . 10 0 . 10 Time Total ------------- Subarea Contribution to Total Flow (cfs) ------------ (hr) Flow Al A2 ' 11 . 0 0 0 ' 0 11 .3 0 0 0 ' 11 . 6 1 1 ' 0 11 . 9 3 2 , 1 12 . 0 3 21 1 12 . 1 6 41 2 ' 12 . 2 lop 6P • 4P 12 . 3 8 5 . 3 ' 12 .4 5 31 2 12 . 5 4 2 • 2 12 . 6 3 2 • 1 12 . 7 2 1 . 1 ' 12 . 8 2 1 1 13 . 0 1 1 0 13 . 2 1 1 0 I ' 13 .4 1 1 0 13 . 6 1 1 0 13 . 8 0 0 , 0 ' 14 . 0 0 0 0 14 .3 0 0 0 14 . 6 0 0 0 15 . 0 0 0 0 15 . 5 0 0 0 16 . 0 0 0 0 ' 16 . 5 0 0 0 17. 0 0 0 0 17. 5 0 0 ' 0 ' 18 .0 0 0 0 19 . 0 0 0 0 20 . 0 0 0 0 ' 22 . 0 0 0 0 26 . 0 0 0 0 H.W.MOORE ASSOCIATES,INC. RIDGESIDE APARTMENTS PAGE: Consulting Engineers - DATE:12/16/99 ' BOSTON,MA 02118 REVISED: STAGE-STORAGE VOLUME WORKSHEET ' PROJECT: RIDGESIDE APARTMENTS LOCATION: SALEM , MA JOB* 1845 DETENTION BASIN: Al (80,000 GAL TANK) WATERSHED(s): Al ' DRAWING SCALE: 1 (in) = 40 (it) DETENTION BASIN STORAGE VOLUME ' PLANIMETERED ELEVATION REGION AREA AVG. AREA VOLUME TOTAL STORAGE VOLUME (in') (Ac.) (Ac.) (Ac.-ft) (Ac:ft) (cf) 82.50 0.97 0.04 0.00 0 0.04 0.01 ' 82.75 0.97 0.04 0.01 388 0.04 0.01 83.00 0.97 0.04 0.02 776 ' 0.04 0.11 86.00 0.97 0.04 0.12 5,432 0.04 0.11 ' 89.01) 0.97 0,04 _ 0.23 10,088 0.04 0.02 89.50 0.97 0.04 0.25 10,864 0.04 0.02 90.00 0.97 0.04 0.27 11.640 0.04 0.01 90.30 0.97 0.04 0.28 12,106 III ' 1845-sWr-sd-dis2xb ' H.W.MOORE ASSOCIATES,INC. RIDGESIDE APARTMENTS PAGE: Consulting Engineers DATE: 12/16/99 BOSTON,MA 02118 REVISED: STAGE/STORAGEIDISCHARGE CALCULATIONS ' PROJECT: RIDGESIDE APARTMENTS LOCATION: SALEM , MA JOB#: 1845 DETENTION BASIN: Al (80,000 GAL TANK) ' WATERSHED(s): Al Elev. : 82.50 - Elev. : 89.50 "C"Value: 3.0 Diam. : 10 in. Length: 18.00 ft. Elev. : Elev.: "C"Value: Diam. : in. Length: ft. ' Orifice 1 Orifice 2 Spillway(0=CLHan) Weir 2 (Q=CLH"') ELEV. H Q H O H L O H L O TOTALO STORAGE (ft) (ft) WS) (ft) -(cfs) (ft) (ft) (Cfs) (ft) (ft) (cfs) (cfs) (Ac.Ft.) ' 82.50 0.00 0.0 0.0 0.00 82.75 0.25 0.2 0.2 0.01 ' 83.00 0.50 0.5 0.5 0.02 86.00 3.50 4.3 4.3 0.12 89.00 6.50 6.5 6.5 0.23 89.50 7.00 6.8 0.00 18.0 0.0 6.8 0.25 ' 90.00 7.50 7.1 0.50 18.0 19.1 26.2 0.27 90.30 7.80 7.3 0.80 18.0 38.6 45.9 0.28 ' DRAINAGE CONTROL STRUCTURE with Overflow Spillway** PEAK STORM ELEV. DCS Al ELEVATION ' . _ . _ . _ . _ . _ . _ . _ _ _ . . _ . _ 90.30 Interior Top of Tank 100-Year 89.46 , - - 89.50 Overflow Spillway Eft 10-Year 86.91 - - - 6.20 ft 2-Year 85.11 - - - 82.50 Invert 10"Orifice- Bottom of Detention Tank ' %45-stor-sta-&Q AS "NOT FOR CONSTRUCTION USE ' FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 100 YR RUNOFF WATERSHED Al 10" ORIFICE ' BASIN AREA = 2 .42 ACRES TOTAL RUNOFF = 5 . 79 INCHES SPILLWAY LENGTH = I FT. SPILLWAY ELEVATION = 82 . 5 WEIR COEFFICIENTI = 1 .4 ' WEIR HEAD EXPONENT 1 = 1 . 5 EQN. BREAKPOINT = 1 .46 WEIR COEFFICIENT 2 = 1 . 95 ' WEIR HEAD EXPONENT 2 = . 64 MAX. HYDROGRAPH TIME = 17 HRS. NUMBER OF INFLOW CURVE POINTS 14 NUMBER OF STORAGE CURVE POINTS = 8 1 ' INFLOW DATA STORAGE DATA TIME INFLOW RATE STORAGE ELEV. STORAGE VOL. HRS. CFS FT. AC-FT 11 . 0 1 . 0 82 . 50 0 . 000 ' 11 . 6 1 .0 82 . 75 0 . 010 11 . 9 4 . 0 83 . 00 0 . 020 12 . 0 5 . 0 86 . 00 0 . 120 ' 12 . 1 9 . 0 89 . 00 0 . 230 12 . 2 14 . 0 89 . 50 0 . 250 12 . 3 12 . 0 90 . 00 0 . 270 12 .4 8 .0 90 . 30 0 .280 12 . 5 6 .0 0 . 00 0 . 000 12 . 6 4 . 0 0. 00 0 . 000 13 . 0 2 . 0 0 . 00 0 . 000 ' 13 . 2 1 . 0 0 . 00 0 . 000 16 . 5 1 .0 0 . 00 0 . 000 17 . 0 0 .0 0 . 00 0 . 000 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 100 YR RUNOFF WATERSHED Al 10" ORIFICE ' TIME FRACTION CUM. AVG. CUM. OUTFLOW WATER STORAGE OF CUM. INFLOW INFLOW OUTFLOW RATE LEVEL RUNOFF RATE ' HRS AC-FT CFS AC-FT CFS AC-FT 11 . 00 . 000 0 . 00 0 . 00 0 . 00 0 . 000 0 . 00 0 . 00 11 . 10 . 007 0 . 01 1 . 00 0 . 00 0 . 123 82 . 70 0 . 01 ' 11 . 20 . 014 0 . 02 1 . 00 0 . 00 0 . 305 82 . 86 0 . 01 11 . 30 . 021 0 . 02 1 . 00 0 . 01 0 . 479 82 . 99 0 . 02 11 .40 . 028 0 . 03 1 . 00 0 . 01 0 . 645 83 . 10 0 . 02 ' 11 . 50 . 035 0 . 04 1 . 00 0 . 02 0 . 768 83 . 17 0 . 03 11 . 60 . 042 0 . 05 1. 00 0 . 02 0 . 851 83 . 22 0 . 03 11 .70 . 053 0 . 06 2 . 00 0 . 03 1 . 131 83 . 37 0 . 03 11 . 80 . 071 0 . 08 3 . 00 0 . 04 1 . 742 83 . 66 0 . 04 ' 11 . 90 . 097 0 . 11 4 . 00 0 . 06 2 . 542 84 . 01 0 . 05 12 . 00 . 129 0 . 15 5 . 00 0 . 08 3 . 002 84 . 46 0 . 07 12 . 10 . 180 0 . 21 9 . 00 0 . 11 3 . 870 85 . 42 0 . 10 ' 12 . 20 . 263 0 . 31 14 . 00 0 . 15 5 . 192 87 . 12 0 . 16 12 . 30 . 354 0 . 41 12 . 00 0 . 19 6 . 290 88 . 73 0 ..22 12 .40 . 424 0 .49 8 . 00 0 . 25 6 . 730 89 .43 0 . 25 12 . 50 .472 0 . 55 6 . 00 0 . 30 6 . 748 89 .46 0 . 25 ' 12 . 60 . 507 0 . 59 4 . 00 0 . 36 6 . 520 89 . 09 0 . 23 12 . 70 . 533 0 . 62 3 . 50 0 . 41 6 . 144 88 . 51 0 . 21 12 . 80 . 556 0 . 65 3 . 00 0 . 46 5 . 732 87. 89 0 . 19 12 . 90 . 576 0 . 67 2 . 50 0 . 51 5 . 291 87 . 26 0 . 17 13 . 00 . 591 0 . 69 2 . 00 0 . 55 4 . 821 86 . 61 0 . 14 13 . 10 . 604 0 . 70 1 . 50 0 . 59 4 . 318 85 . 96 0 . 12 13 . 20 . 612 0 . 71 1 . 00 0 . 62 3 . 734 85 . 26 0 . 10 13 .30 . 619 0 . 72 1 . 00 0 . 65 3 . 179 84 . 65 0 . 07 13 .40 . 626 0 . 73 1 . 00 0 . 67 2 . 698 84 . 16 0 . 06 13 .50 . 633 0 . 74 1 . 00 0 . 69 2 . 074 83 . 80 0 . 05 13 . 60 . 641 0 . 75 1 . 00 0 .71 1 . 599 83 . 59 0 . 04 13 . 70 . 648 0 . 76 1 . 00 0 . 72 1 .348 83 .48 0 . 04 13 . 80 . 655 0 . 76 1 . 00 0 . 73 1 . 208 83 .41 0 . 03 13 . 90 . 662 0 . 77 1 . 00 0 . 74 1 . 126 83 . 36 0 . 03 ' 14 . 00 . 669 0 . 78 1 . 00 0 . 75 1 . 077 83 . 34 0 . 03 14 .10 . 676 0 . 79 1 . 00 0 . 76 1 . 047 83 .32 0 . 03 14 . 20 . 683 0 . 80 1 . 00 0 . 77 1 . 029 83 .31 0 . 03 ' 14 . 30 . 690 0 . 81 1 . 00 0 . 78 1 . 018 83 . 31 0 . 03 14 .40 . 697 0 . 81 1 . 00 0 . 78 1 . 011 83 . 31 0 . 03 14 . 50 . 704 0 . 82 1 . 00 0 . 79 1 . 007 83 . 30 0 . 03 ' 14 . 60 . 711 0 . 83 1 .00 0 . 80 1 . 004 83 . 30 0 . 03 14 . 70 . 718 0 . 84 1 . 00 0 . 81 1 . 003 83 .30 0 . 03 14 . 80 . 725 0 . 85 1 . 00 0 . 82 1 . 002 83 .30 0 . 03 14 . 90 . 733 0 . 86 1 . 00 0 . 83 1 . 001 83 . 30 0 . 03 ' 15 . 00 . 740 0 . 86 1 . 00 0 . 83 1 . 001 83 . 30 0 . 03 15 . 10 . 747 0 . 87 1 . 00 0 . 84 1 . 000 83 . 30 0 . 03 15 .20 . 754 0 . 88 1 . 00 0 . 85 1 . 000 83 .30 0 . 03 ill ' I , FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 100 YR RUNOFF WATERSHED Al 10" ORIFICE ' TIME FRACTION CUM. AVG. CUM. OUTFLOW WATER STORAGE OF CUM. INFLOW INFLOW OUTFLOW RATE LEVEL RUNOFF RATE ' HRS AC-FT CFS AC-FT CFS AC-FT ' 15 . 30 . 761 0 . 89 1 . 00 0 . 86 1 . 000 83 . 30 0 . 03 15 . 40 . 768 0 . 90 1 . 00 0 . 87 1 . 000 83 . 30 0 . 03 15 . 50 . 775 0 . 90 1 . 00 0 . 87 1 . 000 83 . 30 0 . 03 15 . 60 . 782 0 . 91 1 . 00 0 . 88 1 . 000 83 . 30 0 . 03 15 . 70 . 789 0 . 92 1 . 00 0 . 89 1 . 000 83 . 30 0 . 03 15 . 80 . 796 0 . 93 1 . 00 0 . 90 1 . 000 83 . 30 0 . 03 15 . 90 . 803 0 . 94 1 . 00 0 . 91 1 . 000 83 . 30 0 . 03 16 . 00 . 810 0 . 95 1 . 00 0 . 92 1 . 000 83 . 30 0 . 03 16 . 10 . 817 0 . 95 1 . 00 0 . 92 1 . 000 83 . 30 0 . 03 ' 16 . 20 . 825 0 . 96 1 . 00 0 . 93 1 . 000 83 . 30 0 . 03 16 . 30 . 832 0 . 97 1 . 00 0 . 94 1 . 000 83 . 30 0 . 03 16 . 40 . 839 0 . 98 1 . 00 0 . 95 1 . 000 83 . 30 0 . 03 ' 16 . 50 . 846 0 . 99 1 . 00 0 . 96 1 . 000 83 . 30 0 . 03 16 . 60 . 852 0 . 99 0 . 80 0 . 97 0 . 956 83 . 28 0 . 03 16 . 70 . 857 1 . 00 0 . 60 0 . 97 0 . 855 83 . 22 0 . 03 16 . 80 . 860 1 . 00 0 .40 0 . 98 0 . 723 83 . 14 0 . 02 ' 16 . 90 . 862 1 . 01 0 . 20 0 . 99 0 . 575 83 . 05 0 . 02 17 . 00 . 863 1 . 01 -0 . 00 0 . 99 0 . 433 82 . 96 0 . 02 t ' FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT t RIDGESIDE APARTMENTS - SALEM PROPOSED 10 YR RUNOFF WATERSHED Al 10" ORIFICE ' BASIN AREA = 2 .42 ACRES ' TOTAL RUNOFF = 3 . 82 INCHES SPILLWAY LENGTH = 1 FT. SPILLWAY ELEVATION = 82 . 5 WEIR COEFFICIENTI = 1 .4 t WEIR HEAD EXPONENT 1 = 1 . 5 EQN. BREAKPOINT = 1 .46 WEIR COEFFICIENT 2 = 1 . 95 ' WEIR HEAD EXPONENT 2 = 64 MAX. HYDROGRAPH TIME = 15 . 5 HRS . NUMBER OF INFLOW CURVE POINTS = 14 NUMBER OF STORAGE CURVE POINTS = 8 t ' INFLOW DATA STORAGE DATA TIME INFLOW RATE STORAGE ELEV. STORAGE VOL. HRS . CFS FT. AC-FT 11 . 0 0 . 0 82 . 50 0 . 000 ' 11 .3 1 . 0 82 . 75 0 . 010 11 . 9 2 . 0 83 . 00 0 . 020 12 . 0 3 . 0 86 . 00 0 . 120 ' 12 . 1 6 . 0 89 . 00 0 .230 12 . 2 10 . 0 89 . 50 0 . 250 12 . 3 8 . 0 90 . 00 0 . 270 12 .4 5 . 0 90 . 30 0 . 280 ' 12 . 5 4 . 0 0 . 00 0 . 000 12 . 6 3 . 0 0 . 00 0 . 000 12 . 7 2 . 0 0 . 00 0 . 000 12 . 8 1 . 0 0 . 00 0 . 000 15 . 0 1 . 0 0 . 00 0 . 000 15 . 5 0 . 0 0 . 00 0 . 000 i ' It ', 1 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT ' RIDGESIDE APARTMENTS - SALEM PROPOSED 10 YR RUNOFF WATERSHED Al 10" ORIFICE 1 ' TIME FRACTION CUM. AVG. CUM. OUTFLOW WATER STORAGE OF CUM. INFLOW INFLOW OUTFLOW RATE LEVEL RUNOFF RATE ' HRS AC-FT CPS AC-FT CPS AC-FT 11 . 00 . 000 0 . 00 0 . 00 0 . 00 0 . 000 0 . 00 0 . 00 11. 10 . 002 0 . 00 0 .33 0 . 00 0 . 010 82 . 54 0 . 00 11 . 20 . 008 0 . 01 0 . 67 0 . 00 0 . 071 82 . 64 0 . 01 11 . 30 . 017 0 . 01 1 . 00 0 . 00 0 . 215 82 . 79 0 . 01 11 . 40 . 028 0 . 02 1 . 17 0 . 00 0 .421 82 . 95 0 . 02 t 11 . 50 . 042 0 . 03 1 .33 0 . 01 0 . 682 83 . 12 0 . 02 11 . 60 . 057 0 . 04 1 . 50 0 . 01 0 . 951 83 . 27 0 . 03 11 . 70 . 074 0 . 06 1 . 67 0 . 02 1 . 202 83 .40 0 . 03 11 . 80 . 093 0 . 07 1 . 83 0 . 03 1 .432 83 . 52 0 . 04 t 11 . 90 . 114 0 . 09 2 . 00 0 . 05 1 . 645 83 . 61 0 . 04 12 . 00 . 141 0 . 11 3 . 00 0 . 06 2 . 070 83 . 80 0 . 05 12 . 10 . 191 0 . 15 6 . 00 0 . 08 2 . 883 84 . 34 0 . 06 ' 12 . 20 . 279 0 . 21 10 . 00 0 . 11 3 . 979 85 . 55 0 . 10 12 . 30 . 374 0 . 29 8 . 00 0 . 15 4 . 811 86 . 60 0 . 14 12 . 40 .443 0 . 34 5 . 00 0 . 19 5 . 043 86 . 91 0 . 15- 12 . 50 .490 0 . 38 4 . 00 0 . 23 4 . 950 86 . 79 0 . 15 ' 12 . 60 . 527 0 . 41 3 . 00 0 .27 4 . 712 86 .47 0 . 14 12 . 70 . 554 0 .43 2 . 00 0 . 31 4 . 343 85 . 99 0 . 12 12 . 80 . 569 0 . 44 1 . 00 0 . 34 3 . 799 85 .33 0 . 10 ' 12 . 90 . 580 0 .45 1 . 00 0 . 37 3 . 235 84 . 71 0 . 08 13 . 00 . 591 0 .45 1 . 00 0 . 39 2 . 746 84 . 21 0 . 06 13 . 10 . 601 0 .46 1 . 00 0 .42 2 . 147 83 . 83 0 . 05 13 . 20 . 612 0 . 47 1 . 00 0 .43 1 . 636 83 . 61 0 . 04 13 . 30 . 623 0 .48 1 . 00 0 . 44 1 . 369 83 .49 0 . 04 13 .40 . 633 0 . 49 1 . 00 0 .45 1 . 219 83 .41 0 . 03 13 . 50 . 644 0 . 50 1 . 00 0 . 46 1 . 133 83 . 37 0 . 03 ' 13 . 60 . 655 0 . 50 1 . 00 0 . 47 1 . 081 83 . 34 0 . 03 13 . 70 . 666 0 . 51 1 . 00 0 . 48 1 . 050 83 . 33 0 . 03 13 . 80 . 676 0 . 52 1 . 00 0 .49 1 . 031 83 . 32 0 . 03 13 . 90 . 687 0 . 53 1 . 00 0 . 50 1 . 019 83 . 31 0 . 03 ' 14 . 00 . 698 0 . 54 1 . 00 0 . 51 1 . 012 83 . 31 0 . 03 14 . 10 . 709 0 . 55 1 . 00 0 . 52 1. 007 83 . 30 0 . 03 14 . 20 .719 0 . 55 1 . 00 0 . 52 1 . 005 83 . 30 0 . 03 ' 14 .30 .730 0 . 56 1 . 00 0 . 53 1 . 003 83 . 30 0 . 03 14 .40 . 741 0 . 57 1 . 00 0 . 54 1 . 002 83 . 30 0 . 03 14 . 50 . 751 0 . 58 1 . 00 0 .55 1 . 001 83 . 30 0 . 03 ' 14 . 60 . 762 0 . 59 1 . 00 0 . 56 1 . 001 83 . 30 0 . 03 14 .70 . 773 0 . 60 1 . 00 0 . 57 1 . 000 83 . 30 0 . 03 14 . 80 . 784 0 . 60 1 . 00 0 . 57 1 . 000 83 .30 0 . 03 14 . 90 . 794 0 . 61 1 . 00 0 . 58 1 . 000 83 . 30 0 . 03 ' 15 . 00 . 805 0 . 62 1 . 00 0 . 59 1 . 000 83 . 30 0 . 03 15 . 10 . 815 0 . 63 0 . 80 0 . 60 0 . 956 83 . 28 0 . 03 15 . 20 . 822 0 . 63 0 . 60 0 . 61 0 . 855 83 . 22 0 . 03 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 10 YR RUNOFF WATERSHED Al 10" ORIFICE TIME FRACTION CUM. AVG. CUM. OUTFLOW WATER STORAGE OF CUM. INFLOW INFLOW OUTFLOW RATE LEVEL RUNOFF RATE 1 HRS AC-FT CFS AC-FT CFS AC-FT 15 .30 . 827 0 . 64 0 . 40 0 . 61 0 . 723 83 . 14 0 . 02 15 .40 . 830 0 . 64 0 . 20 0 . 62 0 . 575 83 . 05 0 . 02 15 . 50 . 831 0 . 64 -0 . 00 0 . 62 0 .433 82 . 96 0 . 02 1 1 1 I FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 2 YR RUNOFF WATERSHED Al 10" ORIFICE 1 BASIN AREA = 2 . 42 ACRES TOTAL RUNOFF = 2 .45 INCHES SPILLWAY LENGTH = 1 FT. SPILLWAY ELEVATION = 82 . 5 WEIR COEFFICIENTI = 1 .4 WEIR HEAD EXPONENT 1 = 1 . 5 EQN. BREAKPOINT = 1 .46 WEIR COEFFICIENT 2 = 1 . 95 ' WEIR HEAD EXPONENT 2 = . 64 MAX. HYDROGRAPH TIME = 13 . 8 HRS . NUMBER OF INFLOW CURVE POINTS = 13 NUMBER OF STORAGE CURVE POINTS = 8 ' INFLOW DATA STORAGE DATA TIME INFLOW RATE STORAGE ELEV. STORAGE VOL. HRS. CFS FT. AC-FT 11 . 0 0 . 0 82 . 50 0 . 000 11 . 6 1 . 0 82 . 75 0 . 010 11 . 9 2 . 0 83 . 00 0 . 020 12 . 0 2 . 0 86 . 00 0 . 120 12 . 1 4 . 0 89 . 00 0 . 230 12 .2 6 . 0 89 . 50 0 . 250 12 . 3 5 . 0 90 . 00 0 . 270 12 .4 3 . 0 90 .30 0 . 280 ' 12 . 5 2 . 0 0 . 00 0 . 000 12 . 6 2 . 0 0 . 00 0 . 000 12 . 7 1 . 0 0 . 00 0 . 000 ' 13 . 6 1 . 0 0 . 00 0 . 000 13 . 8 0 . 0 0 . 00 0 . 000 1 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 2 YR RUNOFF WATERSHED Al 10" ORIFICE ' TIME FRACTION CUM. AVG. CUM. OUTFLOW WATER STORAGE OF CUM. INFLOW INFLOW OUTFLOW RATE LEVEL RUNOFF RATE HRS AC-FT CFS AC-FT CFS AC-FT' 11 . 00 . 000 0 . 00 0 . 00 0 . 00 0 . 000 0 . 00 0 . 00 11 . 10 . 002 0 . 00 0 . 17 0 . 00 0 . 004 82 . 52 0 . 00 11 .20 . 006 0 . 00 0 .33 0 . 00 0 . 026 82 . 57 0 . 00 11 .30 . 013 0 . 01 0 . 50 0 . 00 0 . 080 82 . 65 0 . 01 11 .40 . 023 0 . 01 0 . 67 0 . 00 0 . 171 82 . 75 0 . 01 ' 11 .50 . 036 0 . 02 0 . 83 0 . 00 0 . 297 82 . 86 0 . 01 11 . 60 . 051 0 . 03 1 . 00 0 . 01 0 . 453 82 . 97 0 . 02 11 . 70 . 071 0 . 03 1 .33 0 . 01 0 . 688 83 . 12 0 . 02 11 . 80 . 096 0 . 05 1 . 67 0 . 02 0 . 993 83 . 30 0 . 03 ' 11 . 90 . 127 0 . 06 2 . 00 0 . 03 1 . 338 83 .47 0 . 04 12 . 00 . 161 0 . 08 2 . 00 0 . 04 1 . 616 83 . 60 0 . 04 12 . 10 . 212 0 . 10 4 . 00 0 . 05 2 . 334 83 . 91 0 . 05 12 . 20 . 298 0 . 15 6 . 00 0 , 08 3 . 047 84 . 51 0 . 07 12 . 30 . 389 0 . 19 5 . 00 0 . 10 3 . 542 85 . 04 0 . 09 12 .40 .454 0 . 22 3 . 00 0 . 13 3 . 606 85 . 11 0 . 09 12 . 50 . 495 0 . 24 2 . 00 0 . 16 3 . 368 84 . 85 0 . 08 ' 12 . 60 . 529 0 . 26 2 . 00 0 . 19 3 . 080 84 . 54 0 . 07 12 . 70 . 553 0 . 27 1 . 00 0 . 21 2 . 714 84 . 18 0 . 06 12 . 80 . 570 0 . 28 1 . 00 0 . 23 2 . 098 83 . 81 0 . 05 12 . 90 . 586 0 . 29 1 . 00 0 . 25 1 . 611 83 . 60 0 . 04 13 . 00 . 603 0 . 30 1 . 00 0 . 26 1 . 355 83 .48 0 . 04 13 . 10 . 620 0 . 31 1 . 00 0 .27 1 . 211 83 .41 0 . 03 13 . 20 . 636 0 . 31 1 . 00 0 . 28 1 . 128 83 . 37 0 . 03 13 . 30 . 653 0 . 32 1 . 00 0 . 29 1 . 078 83 . 34 0 . 03 13 .40 . 670 0 . 33 1 . 00 0 . 30 1 . 048 83 .32 0 . 03 13 .50 . 687 0 . 34 1 . 00 0 . 31 1 . 030 83 .31 0 . 03 ' 13 . 60 . 703 0 . 35 1 . 00 0 . 32 1 . 018 83 . 31 0 . 03 13 . 70 . 715 0 . 35 0 . 50 0 . 33 0 . 901 83 . 25 0 . 03 13 . 80 . 719 0 . 36 -0 . 00 0 . 33 0 . 656 83 . 10 0 . 02 1 RATIONAL PIPE DESIGN RATIONAL PIPE DESIGN r YEAR STORM EVENT LOCATION C A A x C FLOW TIME i Q DESIGN PROFILE 3 `. ¢ O i E N n a w w K > z > z OO F H ¢ a`o z t m °' ww c . > j = zp zO wz U z - a o Z z a � W � ? a N w ¢ w O z O . a w O w w U ~O Z ~ Q W Z rn O W W W w Z _ p _ > w iL p Z U 0.3 0.05 0.02 CB Al-7-1 0.9 0.20 0.18 1 193.50 195.50 DMH Al-7 0.25 0.20 5.00 5.3 I RCPj 12 0.0054 0.013 3.3 3.3 140 1 0.75 90.00 1 89.25 0.72 0.3 0.00 0.00 DMH Al-7 0.9 0.00 0.00 95.50 94.00 DMH Al-6 0.25 1 0.20 5.72 5.2 - RCPJ 12 0.0075 0.013 3.9 3.7 80 0.60 89.25 88.65 0.36 0.31 0.14 0.04 CB Al-6-1 0.9 0.17 0.15 93.80 94.00 DMH Al-6 0.31 0.20 5.00 5.3 I RCP 12 0.02 00 0-13 WO 6.4 1 5.3 5 0.10 88.75 88.65 0.02 0.3 0.00 0.00 DMH Al-6 0.9 0.00 0.00 94.00 95.10 DMH Al-5 0.56 1 0.39 1 6.08 5.2 M,%MIRCPI 15 0.0080 0.013 4.7 4.4 75 0.60 1 88.40 87,80 0.28 0.3 0.00 1 0.00 DMH Al-5 0.9 0.00 1 0.00 95.10 93.20 DMH A1-4 0.56 0.39 6.36 5.1 JUA RCPJ 15 0.0076 0.01311M, 4.6 1 4A 105 0.80 87.80 87.00 0.40 0.3 0.10 0.03 CB Al-4-2 0.9 0.23 0.21 9-3 00 93.20 DMH A14 0.33 1 0.24 1 5.00 1 5.3 RCPJ 12 0.0250 0.013 7.2 6.0 1 20 0.50 89.00 88.50 0.06 0.3 0.07 0.02 CB Al-4-1 0.9 0.18 0.16 93.00 93.20 DMH A1-4 0.25 0.18 5.00 5.3 I RCP 12 0.0143 0.013 5.4 4.6 35 0.50 89.00 88.50 0.13 PROJECT: H.W. MOORE ASSOCIATES, INC. COMP. BY: TNU DATE : December 20, 1999 RIDGESIDE APARTMENTS CONSULTING ENGINEERS CHECK BY: REVISED: SALEM, MA BOSTON, MA JOB#: 8845 SHEET: i OF 7 18 5-rational2.xls RATIONAL PIPE DESIGN YEAR STORM EVENT LOCATION C A A x C FLOW TIME i Q DESIGN PROFILE W W < v Q U aW E N _ a W W 3 J Wa N U Z M RN _ Z 0 � z O OZcc zO a W WZ w H Z O W W W WZ D U O U T z w a Z_ p 0.3 0.00 1 0.00 DMH Al-4 0.9 0.00 0.00 93.20 94.90 DMH Al-3A 1.14 0.81 6.76 5.0 RCP 15 0.0095 0.013 5.1 5.6 200 1.90 87.00 85.10 0.60 0.3 0.00 0.00 DMH Al-3A 0.9 0.00 0.00 94.90 92.40 DMH Al-3 1.14 0.81 7.36 4.9 r RCP 15 0.0062 0.013 4.2 4.7 145 0.90 85.10 84.20 0.52 0.3 0.04 0.01 CB Al-3-1 0.9 0.21 0.19 92.00 92. 00 DMH Al-3 0.25 0.20 5.00 5.3 RCP 12 0.0250 0.013 7.2 5.7 20 0.50 88.00 87.50 0.06 0.3 0.00 0.00 DMH Al-3 0.9 0.00 0.00 92.40 92.40 VT Al-2 1.39 1.01 7.36 4.9 RCP 15 0.0200 0.013 7.5 7.9 5 0.10 84.20 84.10 0.01 0.3 0.00 0.00 VT Al-2 0.9 0.00 1 0.00 92.40 93.60 DMH Al-1 1.39 1.01 7.37 4.9 RCP 15 0.0100 0.013 5.3 5.9 10 0.10 84.10 84.00 0.03 0.3 0.06 0.02 CB Al-1 1-1 0.9 0.20 0.18 92.00 93.70 DMH Al-11 0.26 0.20 5.00 5.3 RCP 12 0.0091 6. 113 4.3 3.9 55 1 0.50 88.00 87.50 0.24 0.3 0.00 0.00 DMH Al-11 0.9 0.00 0.00 93.70 93.60 DMH Al-9 0.26 0.20 5.24 5.3 RCP 12 0.0200 0.013 6.4 5.1 15 0.30 87.50 87.20 0.05 PROJECT: H.W. MOORE ASSOCIATES,INC. COMP. BY: TNU DATE : December 20, 1999 RIDGESIDE APARTMENTS CONSULTING ENGINEERS CHECK BY: REVISED: SALEM,MA BOSTON,MA JOB#: 1845 SHEET: 2 OF 7 1845-raiional2.xls tly • • • �� 7• �m , �� 9:2 ®gym , :. �, 74 TANK Al H.W. MOORE ASSOCIATES, INC. . • :� :• CONSULTING ENGINEERS I Q s' �I RATIONAL PIPE DESIGN r@=YEAR STORM EVENT LOCATION C A A x C FLOW TIME i Q DESIGN PROFILE Q� x a ti wa N z � z Zz OJ H W F < `o z t • d r • > j = x � D U w ¢ w ¢ w L) `- w a wa z w F- z LL ._ a O p z u w w a N � OF z p r a w N O U w w w w w D U o z z w w a 3 z Z _ > > D O U 0.3 0.00 0.00 RD A2-5-2 0.9 0.23 0.21 - 94.50 DW A2-5-1 0.23 0.21 5.00 5.3 RCP 8 0.0333 0.013 6.3 6.5 15 0.50 91.50 91.00 0.04 0.3 0.00 0.00 DW A2-5-1 0.9 0.00 0.00 94.50 94.30 DMH A2-5 0.23 0.21 5.04 5.3 RCP 8 0.0333 0.013 6.3 6.5 15 0.50 91.00 90.50 0.04 0.3 0.00 0.00 RD A2-5-1 0.9 0.23 0.21 94.90 DW A2-5-1 0.23 0.21 5.00 5.3 RCP 8 0.0500 0.013 7.8 7.5 10 0.50 91.50 91.00 0.02 0.3 0.00 0.00 DW A2-5-1 0.9 0.00 0.00 1 1 94.90 94.30 DMH A2-5 0.23 1 0.21 1 5.02 P5.3 RCP 8 0.0125 0.013 3.9 4.4 40 0.50 91.00 90.50 0.15 0.3 0.00 0.00 DMH A2-5 0.9 0.00 0.00 94.30 N9. DMH A2-4 0.46 0.41 5.17 RCP 12 0.0077 0.013 4.0 4.4 155 1.20 90.20 0.58 0.3 0.00 0.00 DMH A2-4 0.9 0.00 0.00 93.40 DMHA2-3 0.46 0.41 5.76 5.2 RCP 12 0.0077 0.013 ' 4.0 4.4 65 0.50 89.00 88.50 0.25 0.3 0.00 0.00 RD A2-3-2 0.9 0.23 0.21 93.50 DW A2-3-2 0.23 0.21 5.00 5.3 RCP 8 0.0500 0.013 7.8 7.5 10 0.50 90.00 89.50 0.02 PROJECT: H.W. MOORE ASSOCIATES,INC. COMP. BY: TNU DATE: December 20, 1999 RIDGESIDE APARTMENTS CONSULTING ENGINEERS CHECK BY: REVISED: SALEM,MA BOSTON, MA JOB#: 1845 SHEET: 5 OF 7 1645-ralionelIxla • F. v =a - �mo�mtm��m�m��m�mma • •, • �mmtmm� moo , • •. . . 7m®m • • .� • =mmt WB��mm. mn . , , • ?? mom :• •• • �mmtmm�m•® gym • , • :? m®m �m�mmm•�m�m��m�mm�� DMH • =�Km�ml�W-WAMU H=w . . • • s' ®gym • . :. •. 5k • > ggcF ep � e EW .. COMP. . . . :. . .: . t ' DRY WELL CALCULATIONS 1 1 H.W.MOORE ASSOCIATES,INC. RIDGESIDE APARTMENTS PAGE Consulting Engineers - DATE: 11/16/99 BOSTON,MA 02118 REVISED: DRY WELL CALCULATIONS DRY WELL DIAMETER D = 6.0 ft. DRY WELL HEIGHT H = 4.0 ft. SURROUND WITH CRUSHED STONE s1 = 2.0 ft. ' SET ON CRUSHED STONE s2 = 1.0 ft. D+(st x 2) EFFECTIVE DIAMETER ED = 10.0 ft. H+s2 EFFECTIVE HEIGHT EH = 5.0 ft. ' (pi xD xH VOLUME 4 Volt 113.1 cf. ' [((pixED xH)-Vpidx0.3 — 4 Vwdes 60.3 cf. ' (pi xED xs2x0.3 4 Vboftom 23.6 cf. TOTAL STORAGE VOLUME = 197 cf. SURFACE AREA (pi x ED x EH) Aside$ = 157.1 sf. ' (pi xED 4 Atoftom = 78.5 sf. TOTAL SURFACE AREA = 236 sf. SECTION A-A" PLAN VIEW*' not to scale not to scale ' ... ......... ............. �. .r r.r.r.r. .. Pyti•tiK•ti ti•ti.ti.ti.L inspection S?•r•!•r..•.. ?.r•r.r•r•r� inspection lid varies 1 ti 1.ya•ti•L. . . .ti•L•ti•L•ti• •r•r•r• •r•r•r•r. A•r• r r•r•r•r. 2A ft crushed stone ��•�•�• 1•ti•1•ti © ® o o r.r.r w gym.. 1.y. r•r•r 7-71 r•r• •r• r•r� ti•y 1• 1•ti ti•• • i•r•r r• i r•r•r• •i•A 1 4-ft r1r1r r1• i ryryr. r1r1s r•r.i ® 0 r•r r jr.r r •r•r !} 1.1• L•ti• L•L•L ti.tiL r•r•r �•r•r r•r• i•tir•e 1.1• ® ® rrmn ti.ti. �{•ti.ti .1r r.r.r {•r.! e•r.r. r.r.r. y.1. 1.y. y.y. I •..ti. r r•r•! a•s.. r•r•r r•r•r• r•r•r 1.1. 0 � ® � S•S• �1.1.1. ti.1 ti• r•r•! l•r•r r•r•l J•r•f•! 1•ti•S•r ti•y . cruse sone w•ti•ti•ti I ti ti•L V•r � ;•r•r 10 ft crushed t .r•r•r•r r•i•r•� r•r•r r•r•r �•r•r•r•r• r•}•}.r 1.ti.ti.1.ti.Yyti•yyti•ti 1.1.�•y .y.1.1.4.y.1. ti.y.ti•1.1 y.1.y.ti� l•r•r•r•r•r•r•r•r•r•r•r•i•r•r•r• � r•r•r.r• r•r•r•r•ryf. .L.y.1.y.y.L.1.y.1.t.y.y 1.1.y.y .y.y.L•y.t.1. `21f1f:Jyryf:•yf�•r,J~11r111! �l1.yti•1.ti ••.1.L.y. r ' •t r.r•r• r.r•r� A ♦ 7 ' 1845drywelnLds " NOT FOR CONSTRUCTION USE H.W.MOORE ASSOCIATES,INC. RIDGESIDE APARTMENTS PAGE Consulting Engineers DATE:11/17/99 BOSTON,MA 02118 REVISED: ON-SITE LEACHING CAPACITY BASED ON : SOIL SURVEY OF ESSEX COUNTY, MASSACHUSETTS, SOUTHERN PART ' PROVIDED BY : THE UNITED STATES DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONSERVATION SERVICE (USDA NRCS) PUBLISHED BY : USDA DATE : May-84 ' SOIL TYPES ON-SITE : CrD CHATFIELD-HOLLIS- ROCK OUTCROP COMPLEX, 15 TO 35% SLOPES Ur URBAN LAND HYDROL. SOIL GROUP : C/D (ASSUMED) PERMEABILITY RANGE : 0.60 to 6.00 in/hr (ESTIMATED) I0.60 in/hr = 1.4E-05 fps. = 100 mpi. ' 6.00 in/hr = 1.4E-04 fps. = 10 mpi. SURFACE AREA OF DRY WELL= 236 sf. MINIMUM Leaching Rafe of Dry Well 1.4E-05 fps x 236 sf. = 0.0033 cfs. 0.0033 cfs = 283 cfd. MAXIMUM Leaching Rate of Dry Well 1.4E-04 fps x 236 Sf. = 0.033 cfs. ' 0.033 cfs = 2,827 cfd. LEACHING RATE PER DRY WELL USED FOR CALCULATIONS = 283 cfd , ' 1845cry"llli..is STANDARD #3 RECHARGE TO GROUNDWATER 1 H.W.MOORE ASSOCIATES,INC. RIDGESIDE APARTMENTS PAGE: Consulting Engineers DATE: 11/17/99 BOSTON,MA 02118 REVISED: STORMWATER MANAGEMENT POLICY STANDARD # 3 RECHARGE TO GROUNDWATER ' HYD. SOIL GROUP RECHARGE PER ACRE A 0.40 in. B = 0.25 in. ' C _ 0.10 in. D 0.00 in. ' TOTAL EXISTING IMPERVIOUS AREA = 2.20 ac. TOTAL PROPOSED IMPERVIOUS AREA = 3.05 ac. 1 NET INCREASE = 0.85 ac. ' HYD. SOIL GROUP A 0.00 ac. B = 0.00 ac. C 0.85 ac. D 0.00 ac. 0.40 in. x 0.00 ac. x 1/12 = ac.-ft. ' 0.25 in. x 0.00 ac. x 1/12 = ac.-ft. 0.10 in. x 0.85 ac. x 1/12 = 0.01 ac.-ft. 0.00 in. x 0.00 ac. x 1/12 = ac.-ft. TOTAL RECHARGE VOLUME REQUIRED = 0.01 ac:ftJd = 309 cfd. TOTAL BUILDING ROOF AREA ON-SITE = 10.09 ac. ROOF AREA RUNOFF VOLUME (1/2-INCH RAINFALL EVENT) = 0.42 ac.-ft TOTAL NUMBER OF DRY WELLS ON-SITE = 4 CALCULATED LEACHING RATE (PER DRY WELL) = 283 cfd. TOTAL CALCULATED LEACHING RATE (DRY WELL) = 1,131 cfd. = 0.03 ac.-fdd ' TOTAL RECHARGE VOLUME PROVIDED = 0.03 ac:ftJd 0.03 ac.-ft. >>> 0.01 ac:ft RECHARGE O.K! ' 18A5.tlrywellll.As 1 1 VORTECHS STORMWATER TREATMENT SYSTEM 1 See Section VII, Appendix C for Vortechnics Information 1 ' Appendix B: Intermittent Stream Information ' 1 II ' I ' 1 ' Stream Status Checklist Project Name: R'rJwGstle A?? AvmA sTown/City ScLlem Date of Observation 1218�49 ' ObservorCtiris R -le A? Data LtSGS 5nL Qdror,gle Essex Cowr4y Sol( MQF Perennial Intermittent Notes/Comments Is RIVER NAMED? No name or% Lk5GS Mqp eC- If not, check Intermittent ✓ SO1, Mq-? If named, check Perennial L1 CURRENT USGS STATUSt L14�T b1v4 '1ne_ on CW CPJ1-lr If light blue or dashed line, check Intermittent ✓ b1SfrS Mq{, If dark blue, check Perennial �^ ' WATERSHED SIZE ES+�ma1e� ww � S�L2 p7 If less than 3 sq. miles, check Intermittent ✓ I StwV-Q If more than 3 sq. miles,check Perennial' L C (9 LISTED ON MA INVENTORY OF STREAMS? No 115-6,k 'in MA 4regM C1cLss; ryccA; 9 If yes, check Perennial `� T 7,5MM o znutWNtryt o.47" Rivers "A If not, check Intermittent 5'We LM Ig82 (Re n' -\ed1 1494). STREAM ORDER Firs Orkr s4re4M On cW'retA If 1st order, check Intermittent USGS McgP . If 2nd order or greater, check Perennial' ,1 WITHIN FEMA 1001500 YEAR FLOOD ZONES No FEMA foo f SSO Year Fi" Zona If yes, check Perennial ' If no, check Intermittent IS RIVER AFFECTED BY WITHDRAWAL? Np wl'E'► Arb000-1 -,Ar +CBS Were, If yes, check Perennial ✓ no}Qa ' If no, check Intermittent y` DROUGHT CONDITIONS? No4 o- dr"`h� Fcrleq If yes & dry, check Perennial (w/caution) NA NA �J If not& dry, check Intermittent Flow o6sw"PA in Peeem6ar CHANNEL & BANK CONDITIONS / Np "TI M& GhQnr'ek I n C0.4-'�a.l If well-defined, scoured and incised, Perennial V Mgt,gh a4m-n Me.. 1o7. If weakly defined w/organic bottom, intermittent No de-i mA Gha nr anal or wsic. boA ARE FISH OBSERVED OR KNOWN? I _ jl Ir, If yes, check Perennial ✓ r;A Were_ nD wVRA ' If not, check Intermittent //'` ` ARE MACROINVERTEBRATES OBSERVED? Few Sn0.1I5 4o%xn . If yes, check Perennial f If not, check Intermittent NO rnacvornverAe-�r_at4- Cr50^tx;%r l . WATER CONTROL STRUCTURES? No WQ�er CorAtel s' ruc�vr@S were- If control structures exist, check Perennial l71sS2rv¢I� If not, check Intermittent (with caution) 1 (}� \ `_ 1 WRITTEN OBSERVATIONS/AFFIDAVITS? No wrl+len 0.T )0. TVj cr o1ISer%"wV If testimony is Intermittent, check Intermittent NA NA have bQm regws+4A Or re.Csi"Q&. If testimony is Perennial, check Perennial OTHER DATA OF NOTE �A I COCAeA 4.$ 1 n)rer1W4� or1 USGS Stream Gauges? Yes, Per. ; No, Int. ✓ Yi SF Q2� 11 Listed Perennial River? See 10:58(2)1.b ESs Cow se 1 Caution:check old USGS mapping against current USGS mapping. Differences are surprisingly common. ' Page 4 MACC Newsletter Early Summer 1999 ' Appendix C: Vortechnics Reference Material 1 1 Vortechnics 1 � 4 t � RVf a a N<a w.ami �Yi, f TGF F>V OF TPAPA NWE'G TJ SHOW TFEiPAENT J-.Fi C-:FE. 1 ' VORTECHST" STORMWATER TREATMENT SYSTEM A major ad%ancenient in oil and grit separator(OGS)technology,the VortechsT"StornLwater Treatment System efficiently removes grit, contanunated sedunents, metals, htidrocarbons and other floating pollutants from surface runoff.Tltis innovative design coinbines two utucpte treatment structures to eliminate turbulence yvitlun the system—ensuring proper physical separation and capture of seditnent and oils. I1 ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ j ' FEATURES: APPLICATIONS: • High treatment efficiency: Over 80% of contaminated • Parking Lots ' sediment is removed during the "first flush". • Gas Stations • Innovative flow control:Seals off bottom of • Industrial Sites floatables barrier preventing loss of captured oils • Retail Outlets , ' during clean-out. • Streets/Roadways • Large treatment capacity: Even the heaviest storms • Vehicle Maintenance Facilities can be treated without bypassing peak flows. • Wetlands Protection Easy inspection—lower clean-out costs:Dry weather volume significantly less than with conventional traps of the same size. ' PATENT PENDING Grit C' CRow hamber Outlet FEATURES ' Chamber Chamber Chamber Chamber GRIT CHAMBER The swirling motion created by the tangential directs settleable solids toward the center. During peak storms this structure dissipates potentially disruptive flows—sediment is caught in the si+irling ' flow path and settles back onto the pile after the storm event is over. OIL CHAMBER PLAN VIEW The center barrier traps floatables in the oil chamber. Swirl Concentrator Oil Barrier Weir Plates Unlike conventional oil traps that lack flow controls and extra tank capacity, the PortechsT" Svstem is highly resistant to flow surges. ' FLOW CONTROL CHAMBER As the storm event builds in intensity. the low-flow control within the Vortechs"' System will cause the inlet pipe to become submerged. This process floats oily pollutants up above the inlet pipe—and out of influent stream. Thus, the Vortechs"' Svstem keeps captured pollutants in the trap by redu(ins forces which encourage resuspension and wash-out. ELEVATION VIEW ' Flow Control PHASES OF OPERATION ' 1) DRY WEATHER/STORM SUBSIDENCE PHASE Treated runoff is decanted out of the Vortechs" System at a controlled rate restoring the water level to a low dry weather volume. This low dry weather level not only facilitates visual inspection of sediment and floatables accumulation but also significantly decreases maintenance costs by reducing punnp-out volume. 2) INITIAL WET WEATHER PHASE During this phase of operation a two-month storm event will cause the water level to rise above the top of the inlet pipe. This flow control effeethely reduces inlet velocity and turbulence. 85% of storm events do not exceed the initial wet weatherphase—sediment and floatables -Y ' ' •. removal during this stage is very high. 4 n�>�;, asp„ -� yrx ,• tt 3) TRANSITION PHASE Flow attenuation achieved during this phase helps to utilizefully the storage capacity of storm sewer pipes and the VortechsT" System. To increase ' storage volume further,on or off-line detention basins can be designed to fill during the transition phase. Sitirling action increases at this stage ELEVATION VIEW capturing sediments and moving material which may have been deposited at inlet(during low flows)into the center of the chamber. - 4) FULL CAPACITY PHASE ' During this phase, the storm drains are operating at peak capacity, typically at 5 to 25 year storm flow rates. To accommoc. greater volumes,Vortechnies can assist designers with configuring a peak flow by-pass. Treatment efficiencies for the VortechsT° System remain constant during this phase, while conventional "plug flour" OGSs have been shown to fail and drop down to ' negative treatment efficiencies. ' COMPARISON OF VORTECHSTIVI SYSTEM SEDIMENT REMOVAL TO CONVENTIONAL OIL GRIT SEPARATORS. 1 ' 25 Vortech� Z — — — Conventional System ioo nal OGSs ' 20 / VORTECHSTmI SYSTEM = � PRODUCT PERFORMANCE - - dW 15 O / Data for VOCteCh STa System obtained ZLLJ lf) CONTAMINATED SEDIMENTS through in-field monitoring of actual L IST By OGSs J11 installation in Freeport, Maine. OGS clata Q i / gleaned out taken from comprehensive testing of W 5j ' conventional systems by the department of ' Environmental Programs, Metropolitan 0 'ik ashington Council of Governments. J M M J S N J M M J 20 MONTH PERIOD "The greatest environmental risk appears to occur when metal and hvclrocarbon- laden sediments are deposited in downstream lakes and estuaries...Runoff from urban hot spots appears to be a major contributing factor to sediment contamination in these cases..." ' -Schueler and Shepp.1993 McKenzie and Hunter. 19,9 ' VORTECHSTNI SYSTEM Vortechs" GritChamber Design Sediment Oil size SPECIFICATION Diann.Model ' ' ,2000 4/ 13 2.8/ 1300 1.2 350 10 x 4 D Plus 6'Typical 3000 5/20 4.4/2 000 1.8 510 11 x 5 ' 4000 6/28 6.3/2 800 2.4 700 12 x 6 T6;rk.„"m. 5000 7/38 8.6/3 800 3.2 920 13 x 7 7000 8/50 1 1.0/5 000 3.9 1200 14 x 8 ° 9000 9/64 14.0/6 400 4.7 1500 15 x 9 / 11000 10/79 18.0/7 900 5-5 - 1800 16 x 10 16000 12/113 25.0/ 11000 7.5 2,500 18, 12 Design Flow rate is based on a peak operating rate of 100 gpnVff'in a 10-year storm. PLAN VIEW Oil and sediment storage volumes given assume a 3 It deep sump and a 1 It opening under the ' oil baffle. These dimensions may vary. 1 FertorztN co..rs \ ATTENTION SPECIFIERS Use the enclosed Specifier's Worksheet to begin the design of four VortechsT'I ' System. Simply fax completed %vorksheet to the Vortechnics Engineering Office (Fax No: 207-878-8507) and 1ce'll produce detailed scale drawings based on your site specific information(free of charge). L ' I''o> 6'm 9' - Note: Availability of models and actual dimensions may vary. Check with —}— e Vortechnics or your local licensed manufacturer for specific information. III ' Y�o r I PATENT PENDING ELEVATION VIEW MAINTENANCE ' The VortechsT" System has no on-going maintenance requirements To Pump Truck although routine inspections are necessary to schedule cleanings. To ensure proper performance and treatment efficiency the system ' must be cleaned when it is full. The VortechsT"System is designed to effectively capture sediment and floatables—the rate at which the system accumulates contaminants is largely dependent on site I activities. - INSPECTION ' In the first year of operation, Vortechnics recommends monthly ELEVATION VIEW inspections during periods of heavy contaminant loadings(e.g..winter sandings,soil disturbances or oil/fuel spills).The inspection schedule can then be modified in subsequent years according to experienc ' or to meet specific stormwater permit requirements. CLEANING ' Clean-out of the VortechsT" System with a vacuum truck is generally the best and most con enient method. Only the manhole rove above the grit chamber (the one farthest from the ssstern outlet) needs to be opened to remote water and contaminants. 1s the grl chamber is pumped out. the oil and water drain back into it. so that oil scum, particulates and floatables are removed along witl accumulated sediments. With the VortechsT" System, a pocket of water between the grit chamber and flow controls seals the bottor of the oil barrier and presents the loss of floatables to the outlet during cleanings. Manhole covers should be securely seated follow in cleaning activities to ensure surface runoff does not leak into unit from above. INSTALLATION OF A VORTECHSTM MODEL 11000 VORTECHS TitSTORMWATER TREATMENT SYSTEM ' . . . . . . . . . . . . v . . v . . . . . . . . . . . o . . ® . . . Vortechnics V� VORTECHNICS , 41 EVERGREEN DRIVE I , PORTLAND,ME 04103 (207)878-3662 FAX:878-8507 1 ' Section VIII ' Project Plans 1 1 1 1 1 1 S � (�, LA w STORM RUNOFF ANALYSIS AND DRAINAGE MAINTENANCE PLAN RIDGmDE APARTMENTS SALEM, MASSACHUSETTS PROPOSED RESIDENTIAL DEVELOPMENT DECEMBER 17, 1999 ffff of rillif H.W.MOORE ASSOCIATES,INC. Consu4ing Engineers 112 SHAWMUT AVENUE BOSTON,MA 02118 - r TABLE OF CONTENTS RIDGESIDE APARTMENTS SALEM, MA DECEMBER 17, 1999 PROJECTDESCRIPTION..............................................................................................................I ExistingConditions..............................................................................................................I ProposedProject..................................................................................................................I DRAINAGECONCEPT..................................................................................................................I Figure1 —Locus Map..............................................................................................2 Figure2—NRCS Soils Map ....................................................................................3 WATERSHEDS...............................................................................................................................4 ExistingConditions..............................................................................................................4 ProposedConditions............................................................................................................4 SOILS ..............................................................................................................................................5 RECHARGE TO GROUNDWATER.............................................................................................5 WATERQUALITY.........................................................................................................................5 CALCULATIONS ..........................................................................:................................................6 Table 1 — Stormwater Runoff Sununary..................................................................6 Table 2 —Stormwater Runoff Sununary by Watershed...........................................7 SILTATION CONTROL PROCEDURES......................................................................................7 DRAINAGE MAINTENANCE PLAN...........................................................................................7 SUMMARY AND CONCLUSIONS .............................................................................................:8 APPENDICES 1. EXISTING CONDITIONS 2. PROPOSED CONDITIONS 3. RATIONAL PIPE DESIGN 4. DRY WELL CALCULATIONS 5. STANDARD #3 —RECHARGE TO GROUNDWATER 6. VORTECHS STORMWATER TREATMENT SYSTEM 1845,s-12-17-99 doc STORM RUNOFF ANALYSIS RIDGESIDE APARTMENTS SALEM, MA DECEMBER 17, 1999 PROJECT DESCRIPTION Existing Conditions The project site consists of approximately 6.25t acres of land located on the south of Highland Avenue (Route 107) in Salem, MA. The site is bordered by Highland Avenue to the north, First Street and commercial development to the west, a New England Power Company transmission line and Salem High School to the east, and the Ledgemere Condominiums to the south. Refer to [Figure I] for the USGS locus plan of the project site. The existing site contains a mostly vacant structure with bituminous parking and access drives occupying approximately half of the site. An adjacent automobile dealership occupies a small portion of the existing site building on a temporary basis. The remaining half of the site consists of undeveloped brush and woodland area with scattered ledge outcroppings. An intermittent brook flows in a southerly direction along the eastern border of the site and has a wetland resource area associated with it. Elevations on-site range from a high of 104t along the southwestern corner of the site to a low of 76t along the eastern border. Site topography is generally sloping west to east with moderate to steep gradients around the southern portion of the site. A review of the soil survey conducted by th&United States Department of Agriculture Natural Resources Conservation Service (USDA NRCS) indicates Chatfield—Hollis—Rock Outcrop Complex and Urban Land as the primary soil on-site. The Chatfield—Hollis —Rock Outcrop Complex is located within the undeveloped portion of the site and Urban Land is found primarily within the developed area of the site. Refer to [Figure 2] for the NRCS Soils Map of the project site and for the hydrologic soil group classification of the soils. Proposed Proiect The proposed project consists of the construction of a multi-unit residential development along with necessary access driveways, parking areas, utility systems and infrastructure. DRAINAGE CONCEPT The scope of this drainage study includes the review of storm water runoff generated from the existing conditions, as well as the expected runoff that the proposed development might generate, along with appropriate mitigation measures. 1845-s..12.1]-99&, • , rPCr `.' { :, � r J �� i .f a'r ♦ /.�rN rift p �:�t :pst o en e q �•, � .{s J� �J`/}i,1ol`J ,V\3.. F'�01i \ �., Gaff Cowse '$chM 11, 7 . 4;_ SITE .us ! > ' °Q a :��/ `.� �/ �rlley+� y \ �• v t O'er ` .7 S \ .t�o�4,cnn'T 0 low wers . --, --- __= —__ ------'cam 1009 0 2000 a000 6000 flow 10om Feet USGS QUADRANGLES: SALEM,MASSACHUSETTS(1985) LYNN,MASSACHUSETTS(1985) FIGURE LOCUS MAP H.W.MOORE ASSOCIATES,INC. SCALE: DATE: 11/22/99 RIDGESIDE APARTMENTS CONSULTING ENGINEERS 1 in.=2,000 ft. JOB#: 1845 SALEM,MA BOSTON,MA FILE#: locusl.xls 18454�61.tla �. ur�4�ti� .,�\. •�mSrtyRi�e~ ✓ ��". '^1�"_s„' gr•R � •�' bL c Mne f t h ..f a 2 / tH�IjuC uUr. 5 trc :ik.. _c.c GALt'tlW$' - . ' - •tit:i HILL try-Ur_ -pd, + •r < ! . '-ems UD GD ._ ; 60 ro71. *1 v jv ` = SITE i .y I n . Doi* p U ip Ur �� c r 11yAyyy f L =c.D �r t r !r_ MAP SYMBOL NAME HYD. SOIL GROUP CrD Charlton-Hollis-Rock Outcrop- Complex CID-B-Not Classified Ur Urban Land Not Classified H"•+, FIGURE NRCS OILS MAP H.W.MOORE ASSOCIATES,INC. SCALE: DATE : 11/22/99 ESSEX COUNTY-MAP 11 CONSULTING ENGINEERS 1 in. = 1,320 ft. JOB#: 1845 SALEM, MA BOSTON,MA FILE#: locust.xls Sportn Runoff Analysis December 17, 1999 Ridgeside Apartments Page 4 This study utilizes the USDA NRCS publication TR-55, which is considered standard methodology and customary for this application. This runoff methodology uses soil type, time of concentration(Tc), vegetative cover and topographical conditions to construct hydrographs for pre-selected storm events. In this case, hydrographs were developed to simulate storm runoff flows for existing and proposed conditions for the 2-year, 10-year and the 100-year storm events. These calculations indicate the order-of-magnitude of existing and proposed peak flows anticipated from the relevant portions of the project site. WATERSHEDS The site has been divided into several watersheds based on drainage patterns to analyze the stormwater runoff from the existing and proposed conditions. Only analysis of the proposed development area was conducted since undisturbed areas would retain their pre-development runoff characteristics. Existing Conditions 1. Watershed Al comprises 2.29 acres located along the northern half of the site and includes all of the existing bituminous parking and drive areas as well as building roof area. Uncontrolled runoff from this watershed drains overland in an easterly direction to an existing wetland resource area. 2. Watershed A2 comprises 2.10 acres located along the southern portion of the site and includes undeveloped brush and woodland areas with scattered rock outcroppings. Uncontrolled runoff from this watershed drains overland in an easterly direction to an existing wetland resource area. Refer to the Existing Watershed Plan appended to the report. Proposed Conditions 1. Watershed AI comprises 2.42 acres located along the northern, southern and western borders of the site and includes some roof area, bituminous parking and drive areas as well as some landscaped areas. Runoff from this watershed is collected in the proposed pipe system and conveyed into the subsurface Detention Tank Al before discharging to the existing wetland resource area. 2. Watershed A2 comprises 1.97 acres centrally located on-site and contains primarily roof and landscaped areas, as well as most of the cement concrete walkways. Runoff from roof area is collected in the proposed pipe system and conveyed to the existing wetland resource area. Runoff from most of the lawn and concrete walks drain overland to the existing wetland resource area. Refer to the Proposed Watershed Plan appended to the report. Attenuation of peak runoff rates from the project site has been provided through an on-site stormwater detention system. Storm runoff from Watershed Al will be conveyed through the 1 945-sm-12-17.99 doc ,�,tonn RunoffAnatysis December 17, 1999 Ridgeside Apartments Page 5 proposed pipe system into the proposed subsurface Detention Tank Al centrally located on-site. This detention tank has been sized to accommodate stormwater runoff from the 100-year event. Runoff will discharge though a 10-inch diameter control orifice within a drainage control structure (DCS A1) at a reduced, predetermined rate, eventually draining into the existing wetland receiving area located along the eastern border of the site. SOILS A review of the United States Department of Agriculture. Natural Resources Conservation Service, Soil Survey of Essex County. Massachusetts, Southern Part indicates Chatfield - Hollis —Rock Outcrop Complex and Urban Land as the primary soils on-site. Chatfield—Hollis—Rock Outcrop Complex is on undulating and rolling ridges and hills. It consists of well-drained, moderately deep Chatfield soils; somewhat excessively drained, shallow Hollis soils; and exposed bedrock These soils and areas of exposed bedrock are intermingled so closely that it was not practical to separate them at a scale used for mapping. As a unit, these soils have a hydrologic soil group classification CID. Urban Land is so altered or obscured by urban works or structures that classification is not possible. This soil is unclassified. RECHARGE TO GROUNDWATER According to the Department of Environmental Protection's (DEP) Stormwater Management Policy, post-development groundwater recharge rates should equal pre-development rates based upon the increase in net impervious area and the hydrologic soil group classifications of the on- site soils. Currently, the developed half of the existing site is essentially impervious area, while the undeveloped half of the site consists of poorly drained soils (hydrologic group C/D) with scattered ledge outcroppings and moderate to steep gradients. These existing site conditions would provide for a negligible groundwater recharge rate, making post-development mitigation unnecessary. For this project, however, new roof runoff will be directed into pre-cast concrete drywells for , infiltration into the underlying soils, thereby providing recharge rates equal to or greater than existing conditions. According to the DEP Stormwater Management Policy, roof runoff is considered clean and therefore requires no pre-treatment before infiltrating. WATER QUALITY The addition of 3.05t acres of impervious area(including 1.21f acres of roof area) may serve to slightly increase the amount of Total Suspended Solids (TSS) in the stormwater runoff. Roof related runoff is considered clean and requires no pretreatment, so only treatment of parking area related runoff is necessary. To ensure compliance with the DEP Stormwater regulations, all parking lot runoff collected in 1845-sn-12-17-9 1 doc Storm Runoff Atralysis December 17, 1999 Ridgeside Apartments Page 6 the proposed drain system will be routed though proprietary treatment chambers manufactured by Vortechnics. These treatment devices (Vortechs models 3000 and 4000) are comprised of three internal chambers which act as a grit chamber, oil chamber and flow control chamber. Within the grit chamber, the swirling motion created by the tangential inflow directs settleable solids toward the center. The oil chamber and flow control chamber traps oily pollutants up and out of the effluent stream, while simultaneously reducing the forces which may cause re-suspension and washout. These treatment devices will remove at least 80% of the TSS in the stormwater runoff before the runoff discharges into the existing wetland resource area. All proposed catch basins will be equipped with 4-ft. deep sumps and oil trap hoods to further increase the TSS removal from the stormwater runoff. CALCULATIONS Analysis of the on-site piping system was conducted using the Rational Method and 10-year and 25-year design storms. The calculations indicate the "order-of-magnitude" of peak runoff rates under existing and proposed conditions for the 2-year, 10-year and 100-year storm event recurrence interval. As can be seen, there is a reduction in the peak rate of runoff discharging from the site for the storm events under proposed conditions, and therefore, there will be no adverse effect on the watershed or its environs. [Table I] summarizes the calculated peak runoff rates for the total site, and [Table 2] summarizes the calculated peak runoff rates for the individual site watersheds, indicating complete mitigation. TABLE 1 STORMWATER RUNOFF SUMMARY STORM EVENT EXISTING PEAK RATE PROPOSED PEAK RATE (cfs) (cfs) 2-YEAR 8 8 10-YEAR 13 12 +* 100-YEAR 20 17 *++ ' 0%net reduction 8%net reduction "' 15%net reduction 1845-sra-12-17-W doc $corm Runoff Analysis December 17, 1999 Ridgeside Apartments Page 7 TABLE 2 PEAK STORMWATER RUNOFF SUMMARY BY WATERSHED m m °. U v .0 o _ C 0 O U O O CO U U = O < = O o o = U U a UC= UOo U 3 < = d a a a a C, 3 F d o' a (5 a" a Ac Hr. cfs cfs cfs Ac. Hr, 7cfS cfs cis Al 2.29 97 0.10 15 10 7 AI 2.42 94 0.110 s 6 4 A2 2.10 74 0.20 5 3 1 , 1.97 88 0.17 4 4.39 20 13 8 4.39 17 12 8 SILTATION CONTROL PROCEDURES Downslope areas will be protected through the installation of a combination of staked hay bales and filter fabric fence to be located along the perimeter and/or elsewhere as required to protect and stabilize earthworks. All embankment slopes will be fine graded and stabilized by means of wood chip mulch, shrubs, sod and/or seed and mulch as is appropriate and consistent with the landscaping plan. All pipe drains and catch basins will be installed early in the construction period in order to provide early control of site runoff. Crushed stone will be judiciously applied to stabilize select areas, as required, during the course of construction. DRAINAGE MAINTENANCE PLAN The site shall be maintained by the project owner to provide a stabilized, maintained surface thereby preventing excess materials from contacting surface runoff and minimizing transport of materials within the drain system. In that regard, the following program is proposed. On an Annual Basis: • Inspect all drainage structures including catch basins, manholes and inlets and note any deficiencies, remove any obstructions to flow, make any necessary repairs. • Clean all catch basin sumps by an independent licensed contractor. Remove all accumulated sediment and floatable debris for lawful offsite disposal. • Clean the on-site detention tank of accumulated materials. 1845-sa-12-17-99.d.c Storm Runoff Analysis December 77, 1999 Ridgeside Apartments Page 8 On a Semi-Annual Basis: • Parking lots will be swept by appropriate means to remove accumulated silts and sediments from the surface of paved ways. This work is best accomplished in early spring, following deposition of winter deicing materials, but prior to spring wet weather period, and in the fall. On a Monthly Basis: • Provide proper policing of grounds to remove and deleterious surface materials including ground litter. • Maintain vegetation by cutting lawns and trimming landscaped areas. Remove all clippings from the site and provide for lawf ul disposal. • Police the dumpster area and ensure proper containment of waste material As Needed: • Stabilize or repair any exposed earthworks resulting from site maintenance. • Clean up any spills or material deposits resulting from landscape operation or ongoing site activities. SUMMARY AND CONCLUSIONS Significant attention and consideration has been given to proper management of storm water runoff from the project site. The unique specific site characteristics and hydrologic setting has been carefully studied to develop a comprehensive plan that fully utilizes and recognizes these attributes. Disposition of storm water has been considered, with respect to its peak rate, total volume and water quality aspects, to ensure successful runoff mitigation upon project completion. • There will be no adverse impact to any surrounding areas. • The drain system has been properly designed to handle the design flow rates. • Decreased TSS as compared to existing conditions. 1845sm12-17-99.dn EXISTING CONDITIONS PROPOSED CONDITIONS RUNOFF CURVE NUMBER COMPUTATION Version 2 . 10 Dj.ect : RIDGESIDE APARTMENTS User: TNU Date : 11-15-1999 inty : ESSEX State : MA Checked: Date : Dtitle : EXISTING CONDITIONS Darea : Al ----------------------------------------------------- --- ------- ---------- ---- Hydrologic Soil Group COVER DESCRIPTION A B C D Acres (CN) -------------------------------------------------- -------------------- --- ---- ,LY DEVELOPED URBAN AREAS (Veg Estab. ) m space (Lawns,parks etc . ) food condition; grass cover > 75 . - - . 05 (74) . 04 (80) )ervious Areas )awed parking lots, roofs, driveways - - 1 . 1 (98) 1 . 1 (98) :al Area (by Hydrologic Soil Group) 1 . 15 1 . 14 -- --- ----------------------- --------------------------------------- -------- -- .AREA: Al TOTAL DRAINAGE AREA: 2 . 29 Acres WEIGHTED CURVE NUMBER: 97 - --------------------------------------------------------------------------- RUNOFF CURVE NUMBER COMPUTATION Version 2 . 10 eject RIDGESIDE APARTMENTS User: TNU Date : 11-15-1999 .nty ESSEX State : MA Checked: Date : I ,title : EXISTING CONDITIONS )area : A2 ------------------------ ------------ - ------- ------------------ Hydrologic Soil Group COVER DESCRIPTION A B C D Acres (CN) ---------------------------------- ER AGRICULTURAL LANDS Ids good - - 1 . 05 (70) 1 . 05 (77) al Area (by Hydrologic Soil Group) 1 . 05 1 . 05 ------------------------------------- - ------- - - -------------- AREA: A2 - TOTAL DRAINAGE AREA: 2 . 1 Acres WEIGHTED CURVE NUMBER: 74 - -- - ------- ----------------------------- ------ --------------- - TIME OF CONCENTRATION AND TRAVEL TIME Version 2 . 10 ject RIDGESIDE APARTMENTS User: TNU Date : 11-15-1999 my ESSEX State : MA Checked: Date : title : EXISTING CONDITIONS --- ----- - ---------------- --- Subarea #2 - A2 ------------------------------ - w Type 2 year Length Slope Surface n Area Wp Velocity Time rain (ft) (ft/ft) code (sq/ft) (ft) (ft/sec) (hr) --- ----------- --------------------- ------ ------------- - ------- --- et 3 . 1 50 . 070 H 0 . 127 11ow Concent ' d 190 . 037 U 0 . 017 llow Concent ' d 45 . 2 U 0 . 002 Time of Concentration = 0 . 15* --- Sheet Flow Surface Codes --- A Smooth Surface F Grass, Dense --- Shallow Concentrated -- B Fallow (No Res . ) G Grass, Burmuda --- Surface Codes --- C Cultivated < 20 % Res . H Woods, Light P Paved D Cultivated > 20 % Res . I Woods, Dense U Unpaved E Grass-Range, Short J Range, Natural Generated for use by TABULAR method TABULAR HYDROGRAPH METHOD Version 2 . 10 )ject : RIDGESIDE APARTMENTS User: TNU Date : 11-15-1999 inty : ESSEX State : MA Checked: Date : )title : EXISTING CONDITIONS :al watershed area: 0 . 007 sq mi Rainfall type : III Frequency: 100 years ------------- ----- -------- Subareas ------------------- --- ---- Al A2 �a (sq mi) 0 . 00* 0 . 00* nfall (in) 6 . 5 6 . 5 ve number 97* 74* icff (in) 6 . 14 3 . 61 (hrs) 0 . 10 0 . 15* (Used) 0 . 10 0 .20 ieToOutlet 0 . 00 0 . 00 P 0 . 01 0 . 11 (Used) 0 . 10 0 . 11 ie Total ------------- Subarea Contribution to Total Flow (cfs) ---- --- ----- Flow Al A2 0 1 1 0 3 1 1 0 6 2 1 1 9 5 4 1 0 7 5 2 1 12 9 3 2 20P 15P 5 3 19 12 7P 4 14 8 6 5 10 6 4 6 7 4 3 7 5 3 2 8 4 2 2 0 3 2 1 2 2 1 1 4 2 1 1 '0 2 1 1 9 2 1 1 3 2 1 1 3 2 1 1 2 1 1 1 1 0 1 1 0 1 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TABULAR HYDROGRAPH METHOD Version 2 . 10 >ject : RIDGESIDE APARTMENTS User: TNU Date : 11-15-1999 inty : ESSEX State : MA Checked: Date : )title : EXISTING CONDITIONS :al watershed area: 0 . 007 sq mi Rainfall type : III Frequency: 10 years ------ -------------------- Subareas -------- ------------------ Al A2 ia (sq mi) 0 . 00* 0 . 00* .nfall (in) 4 . 5 4 . 5 "ve number 97* 74* Doff (in) 4 . 15 1 . 97 (hrs) 0 . 10 0 . 15* (Used) 0 . 10 0 . 20 teToOutlet 0 . 00 0 . 00 P 0 . 01 0 . 16 (Used) 0 . 10 0 . 16 .e Total --------- ---- Subarea Contribution to Total Flow (cfs) ----- -- -- --- Flow Al A2 0 0 0 0 3 1 1 0 6 1 1 0 9 4 3 1 0 5 4 1 1 7 6 1 2 13P lop 3 3 12 8 4P 4 8 5 3 5 6 4 2 6 5 3 2 7 3 2 1 8 2 1 1 0 2 1 1 2 2 1 1 1 1 0 1 1 0 3 1 1 0 1 1 0 3 1 1 0 1 1 0 D 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TABULAR HYDROGRAPH METHOD Version 2 . 10 ject : RIDGESIDE APARTMENTS User: TNU Date : 11-15-1999 my : ESSEX State : MA Checked: Date : ititle : EXISTING CONDITIONS al watershed area : 0 . 007 sq mi Rainfall type : III Frequency: 2 years -------------------------- Subareas ------- ------------- ------- Al A2 ' a (sq mi) 0 . 00* 0 . 00* nfall (in) 3 . 1 3 . 1 ve number 97* 74* ' off (in) 2 . 76 0 . 97 (hrs) 0 . 10 0 . 15* (Used) 0 . 10 0 . 20 ToOutlet 0 . 00 0 . 00 P 0 . 02 0 . 23 (Used) 0 . 10 0 . 23 Total -- -- - -------- Subarea Contribution to Total Flow (cfs) -------- Flow Al A2 0 0 0 3 0 0 0 1 1 0 3 2 2 0 D 2 2 0 L 5 4 1 ? 8P 7P 1 3 7 5 2P 1 4 3 1 > 4 3 1 3 3 2 1 7 2 1 1 3 1 1 0 1 1 0 1 1 0 k 1 1 0 1 1 0 3 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 ' 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 PROPOSED CONDITIONS RUNOFF CURVE NUMBER COMPUTATION Version 2 . 10 oject : RIDGESIDE APARTMENTS User: TNU Date : 12-16-1999 unty : ESSEX State : MA Checked: Date : btitle : PROPOSED CONDITIONS barea : Al ---------------- --- ------------------------ ------- -- ----- --- -------------- --- COVER DESCRIPTION A Hydrologic Soil Group C D Acres (CN) -- ------------------------------------------------ ----- --- LLY DEVELOPED URBAN AREAS (Veg Estab. ) en space (Lawns,parks etc . ) 3ood condition; grass cover > 750-. - - . 22 (74) . 21 (80) cervious Areas Paved parking lots, roofs, driveways - - 1 . 00 (98) 0 . 99 (98) :al Area (by Hydrologic Soil Group) 1 . 22 1 . 2 --- ----- ------- - - ------------------------------------------------ -- -- - ------- 3AREA: Al TOTAL DRAINAGE AREA: 2 . 42 Acres WEIGHTED CURVE NUMBER: 94 ----- - ---- --------- --- ------ ----------------------- - -- -- ------- -- --------- - - - RUNOFF CURVE NUMBER COMPUTATION Version 2 . 10 -Oject RIDGESIDE APARTMENTS User: TNU Date : 12-16-1999 county ESSEX State : MA Checked: Date : ibtitle : PROPOSED CONDITIONS Subarea : A2 -------- -- ------------ - COVER DESCRIPTION A HydroBogic Soil Group C D Acres (CN) ---- -- -- -- - - ------------------- ----- ------------------------- ------ --- -------- JLLY DEVELOPED URBAN AREAS (Veg Estab . ) Open space (Lawns, parks etc . ) Good condition; grass cover > 750-. - - 46 (74) 45 (80) i.apervious Areas Paved parking lots, roofs, driveways - - 0 . 53 (98) 0 . 53 (98) Total Area (by Hydrologic Soil Group) . 989 98 - - - - ----- - --------------------- --- - - ----------- ------- - --- --- --- -- JBAREA: A2 TOTAL DRAINAGE AREA: 1 . 97 Acres WEIGHTED CURVE NUMBER: 88 - ---- -- -------------- - ------------------- - ------------------------------- -- --- - r TIME OF CONCENTRATION AND TRAVEL TIME Version 2 . 10 1 oject : RIDGESIDE APARTMENTS User: TNU Date : 12-16-1999 ' County : ESSEX State : MA Checked: Date : .btitle : PROPOSED CONDITIONS -—- - --- -- ---- Subarea #1 - Al --------- F ow Type 2 year Length Slope Surface n Area Wp Velocity Time rain (ft) (ft/ft) code (sq/ft) (ft) (ft/sec) (hr) --- -- ----- --------- ---- --- ---- -------- ----- -------- creet 3 . 1 60 . 023 A 0 . 013 .allow Concent ' d 100 . 014 P 0 . 012 Open Channel 940 3 0 . 087 12 Time of Concentration = 0 . 11* --- Sheet Flow Surface Codes --- A Smooth Surface F Grass, Dense - -- Shallow Concentrated - B Fallow (No Res . ) G Grass, Burmuda --- Surface Codes -- - C Cultivated < 20 °s Res . H Woods, Light P Paved D Cultivated > 20 o Res . I Woods, Dense U Unpaved E Grass-Range, Short J Range, Natural * - Generated for use by TABULAR method TABULAR HYDROGRAPH METHOD Version 2 . 10 roject : RIDGESIDE APARTMENTS User: TNU Date : 12-16-1999 .'ounty : ESSEX State : MA Checked: Date : ubtitle : PROPOSED CONDITIONS Total watershed area: 0 . 007 sq mi Rainfall type : III Frequency: 100 years ----- --------------------- Subareas - ------ ---- --- --- - -------- Al A2 Area (sq mi) 0 . 00* 0 . 00* Dainfall (in) 6 . 5 6 . 5 arve number 94* 88* nunoff (in) 5 . 79 5 . 11 Tc (hrs) 0 . 11* 0 . 10 (Used) 0 . 10 0 . 10 imeTcOutlet 0 . 00 0 . 00 Ia/P 0 . 02 0 . 04 (Used) 0 . 10 0 . 10 Time Total ------ ------ - Subarea Contribution to Total Flow (cfs) ----- ----- -- (hr) Flow Al A2 -1 . 0 1 1" 0 11 . 3 2 1 1 L . 6 2 11 1 L . 9 7 4 • 3 12 . 0 9 5 ' 4 12 . 1 16 9 7 ? . 2 24P 14P ' lop 12 . 3 20 12 • 8 2 . 4 13 8 5 ? . 5 10 6 4 12 . 6 7 40 3 - ? . 7 5 3 2 ? . 8 4 2 2 13 . 0 3 2 1 13 . 2 2 1 1 � . 4 2 1 1 13 . 6 2 1 1 8 2 1 1 6 . 0 2 1 1 14 . 3 2 1 1 2 1 1 0 2 1 1 15 . 5 2 1 1 16 . 0 1 1 0 0 17 . 0 0 0 0 5 0 0 0 - 1 . 0 0 0 0 19 . 0 0 0 0 2n . 0 0 0 0 ' • 0 0 0 0 0 0 0 0 TABULAR HYDROGRAPH METHOD Version 2 . 10 i, Dject RIDGESIDE APARTMENTS User: TNU Date : 12-16-1999 lnty ESSEX State : MA Checked: Date : Dtitle : PROPOSED CONDITIONS :al watershed area: 0 . 007 sq mi Rainfall type : III Frequency: 10 years -- ---- - ----------- Subareas ------ ------------ ---- -- -- Al A2 �a (sq mi) 0 . 00* 0 . 00* infall (in) 4 . 5 4 . 5 -ve number 94* 88* loff (in) 3 . 82 3 . 20 (hrs) 0 . 11* 0 . 10 (Used) 0 . 10 0 . 10 neTcOutlet 0 . 00 0 . 00 /P 0 . 03 0 . 06 (Used) 0 . 10 0 . 10 ne Total -- - - -- -- - ---- Subarea Contribution to Total Flow (cfs) ------- - - --- Flow Al A2 . 0 0 0 ' 0 . 3 1 1 0 6 2 1 1 9 4 2 2 0 5 3 2 1 10 6 4 2 17P lop 7P 3 13 8 � 5 4 8 5 3 5 7 4 • 3 6 5 3 ' 2 7 3 2 1 8 2 1 • 1 0 2 1 1 2 2 1 1 4 2 1 1 6 2 1 1 8 2 1 1 0 1 1 0 3 1 1 0 6 1 1 0 0 1 1 , 0 5 0 0 0 0 0 0 0 5 0 0 0 0 0 0 0 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TABULAR HYDROGRAPH METHOD Version 2 . 10 oject RIDGESIDE APARTMENTS User: TNU Date : 12-16-1999 -aunty ESSEX State : MA Checked: Date : btitle : PROPOSED CONDITIONS Total watershed area : 0 . 007 sq mi Rainfall type : III Frequency: 2 years - ----------- -- -- ---- ---- -- Subareas --- --------------- - -- ----- Al A2 Area (sq mi) 0 . 00* 0 . 00* R--infall (in) 3 . 1 3 . 1 rve number 94* 88* Runoff (in) 2 . 45 1 . 91 Tc (hrs) 0 . 11* 0 . 10 (Used) 0 . 10 0 . 10 I__meToOutlet 0 . 00 0 . 00 Ia/P 0 . 04 0 . 09 (Used) 0 . 10 0 . 10 rime Total - - --------- -- Subarea Contribution to Total Flow (cfs) ------ --- -- - (hr) Flow Al A2 r� . 0 0 0 ' 0 11 . 3 0 0 0 1 . 6 1 11 0 L . 9 3 2 , 1 L2 . 0 3 2 ' 1 L" . 1 6 41 2 L . 2 10P 6P 4P L2 . 3 8 51 3 L .4 5 3 . 2 L- . 5 4 2 2 L2 . 6 3 2 1 L . 7 2 l 1 L . 8 2 1 1 L3 . 0 1 1 0 L' . 2 1 1 0 L .4 1 1 0 -3 . 6 1 1 0 . 8 0 0 0 . 0 0 0 0 -4 . 3 0 0 0 - ' . 6 0 0 0 . 0 0 0 0 -5 . 5 0 0 0 -r . 0 0 0 0 -� . s 0 0 0 .7 . 0 0 0 0 . 5 0 0 0 • 0 0 0 0 9 • 0 0 0 0 ' . 0 0 0 0 . 0 0 0 0 b . 0 0 0 0 H.W.MOORE ASSOCIATES,INC. RIDGESIDE APARTMENTS PAGE: Consulting Engineers DATE:12/16/99 BOSTON,MA 02118 REVISED: STAGE-STORAGE VOLUME WORKSHEET PROJECT: RIDGESIDE APARTMENTS LOCATION: SALEM , MA JOB #: 1845 DETENTION BASIN: Al (80,000 GAL TANK) WATERSHED(s): Al DRAWING SCALE: 1 (in) = 40 (ft) DETENTION BASIN STORAGE VOLUME PLANIMETERED ELEVATION REGION AREA AVG. AREA VOLUME TOTAL STORAGE VOLUME (in) (Ac.) (Ac.) (Ac:ft) (Ac.-ft) (cf) 82.50 0.97 0.04 0.00 0 0.04 0.01 82.75 0.97 0.04 0.01 388 0.04 0.01 83.00 0.97 0.04 0.02 776 0.04 0.11 86.00 0.97 0.04 0.12 5,432 0.04 0.11 89.00 0.97 0.04 0.23 10,088 0.04 0.02 89,50 �0.97 0.04 0.25 10,864 0.04 0.02 90.00 0.97 0.04 0.27 11,640 0.04 0.01 90.30 0.97 0.04 0.28 12,106 �B45storvsta-tlis2.xls H.W.MOORE ASSOCIATES,INC. RIDGESIDE APARTMENTS PAGE : Consulting Engineers DATE: 12/16/99 BOSTON, MA 02118 REVISED STAGEISTORAGE/DISCHARGE CALCULATIONS PROJECT: RIDGESIDE APARTMENTS LOCATION: SALEM , MA JOB#: 1845 DETENTION BASIN: Al (80,000 GAL TANK) WATERSHED(s): Al Elev. : 82.50 l s '- Elev. : 89.50 "C'Value: a • 3.0 Diann. : 10 in. . ;y Length : 18.00 ft. amElev. : Elev. : "C"Value: i n Diam. : in. Length: ft. Orifice 1 Orifice 2 Spillway(Q=CLH") Weir 2 (Q=CLH12) ELEV. H Q H Q H L Q H L Q TOTALQ STORAGE (ft) (ft) (cfs) (ft) Ids) (ft) (ft) (Cfs) (ft) (ft) (Cfs) (Cfs) (Ac.Ft.) 82.50 0.00 0.0 0.0 0.00 82.75 0.25 0.2 0.2 0.01 83.00 0.50 0.5 0.5 0.02 86.00 3.50 4.3 4.3 0.12 89.00 6.50 6.5 6.5 0.23 89.50 7.00 6.8 0.00 18.0 0.0 6.8 0.25 90.00 7.50 7.1 0.50 18.0 19.1 26.2 0.27 90.30 7.80 7.3 0.80 18.0 38.6 45.9 0.28 DRAINAGE CONTROL STRUCTURE with Overflow Spillway*• PEAK STORM ELEV. DCS Al ELEVATION . _ . _ . • . • . • _ • _ • . • . 90.30 Interior Top of Tank 100-Year 89.46 - - ,,. g 89.50 Overflow Spillway .t' -`t"" Lam- r•` 10-Year 86.91 - - - - - offill � a ,. T 5.} 6.2 ft - 2-Year 85.11 pt zp- vT .asdsdT -Y- '* 3 `� tea` Yamr eL, III � .k - 82.50 Invert 10"Orifice `',., Bottom of Detention Tank 1845-stor-staEisl.ls "NOT FOR CONSTRUCTION USE FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 100 YR RUNOFF WATERSHED Al 10" ORIFICE BASIN AREA = 2 .42 ACRES TOTAL RUNOFF = 5 . 79 INCHES SPILLWAY LENGTH = 1 FT. SPILLWAY ELEVATION = 82 . 5 WEIR COEFFICIENTI = 1 . 4 WEIR HEAD EXPONENT 1 = 1 . 5 EQN. BREAKPOINT = 1 . 46 WEIR COEFFICIENT 2 = 1 . 95 WEIR HEAD EXPONENT 2 = . 64 MAX. HYDROGRAPH TIME = 17 HRS . NUMBER OF INFLOW CURVE POINTS = 14 NUMBER OF STORAGE CURVE POINTS = 8 INFLOW DATA STORAGE DATA TIME INFLOW RATE STORAGE ELEV. STORAGE VOL. HRS . CFS FT. AC-FT 11 . 0 1 . 0 82 . 50 0 . 000 11 . 6 1 . 0 82 . 75 0 . 010 11 . 9 4 . 0 83 . 00 0 . 020 12 . 0 5 . 0 86 . 00 0 . 120 12 . 1 9 . 0 89 . 00 0 . 230 12 . 2 14 . 0 89 . 50 0 . 250 12 . 3 12 . 0 90 . 00 0 . 270 12 . 4 8 . 0 90 . 30 0 . 280 12 . 5 6 . 0 0 . 00 0 . 000 12 . 6 4 . 0 0 . 00 0 . 000 13 . 0 2 . 0 0 . 00 0 . 000 13 . 2 1 . 0 0 . 00 0 . 000 16 . 5 1 . 0 0 . 00 0 . 000 17 . 0 0 . 0 0 . 00 0 . 000 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 100 YR RUNOFF WATERSHED Al 10 " ORIFICE TIME FRACTION CUM. AVG. CUM. OUTFLOW WATER STORAGE OF CUM. INFLOW INFLOW OUTFLOW RATE LEVEL RUNOFF RATE HRS AC-FT CFS AC-FT CFS AC-FT 11 . 00 . 000 0 . 00 0 . 00 0 . 00 0 . 000 0 . 00 0 . 00 11 . 10 . 007 0 . 01 1 . 00 0 . 00 0 . 123 82 . 70 0 . 01 11 . 20 . 014 0 . 02 1 . 00 0 . 00 0 . 305 82 . 86 0 . 01 11 . 30 . 021 0 . 02 1 . 00 0 . 01 0 . 479 82 . 99 0 . 02 11 .40 . 028 0 . 03 1 . 00 0 . 01 0 . 645 83 . 10 0 . 02 11 . 50 . 035 0 . 04 1 . 00 0 . 02 0 . 768 83 . 17 0 . 03 11 . 60 . 042 0 . 05 1 . 00 0 . 02 0 . 851 83 . 22 0 . 03 11 . 70 . 053 0 . 06 2 . 00 0 . 03 1 . 131 83 . 37 0 . 03 11 . 80 . 071 0 . 08 3 . 00 0 . 04 1 . 742 83 . 66 0 . 04 11 . 90 . 097 0 . 11 4 . 00 0 . 06 2 . 542 84 . 01 0 . 05 12 . 00 . 129 0 . 15 5 . 00 0 . 08 3 . 002 84 . 46 0 . 07 12 . 10 . 180 0 . 21 9 . 00 0 . 11 3 . 870 85 . 42 0 . 10 12 . 20 . 263 0 . 31 14 . 00 0 . 15 5 . 192 87 . 12 0 . 16 12 . 30 . 354 0 . 41 12 . 00 0 . 19 6 . 290 88 . 73 0 . 22 12 . 40 . 424 0 . 49 8 . 00 0 . 25 6 . 730 89 .43 0 . 25 12 . 50 . 472 0 . 55 6 . 00 0 . 30 6 . 748 89 . 46 0 . 25 12 . 60 . 507 0 . 59 4 . 00 0 . 36 6 . 520 89 . 09 0 . 23 12 . 70 . 533 0 . 62 3 . 50 0 . 41 6 . 144 88 . 51 0 . 21 12 . 80 . 556 0 . 65 3 . 00 0 . 46 5 . 732 87 . 89 0 . 19 12 . 90 . 576 0 . 67 2 . 50 0 . 51 5 . 291 87 . 26 0 . 17 13 . 00 . 591 0 . 69 2 . 00 0 . 55 4 . 821 86 . 61 0 . 14 13 . 10 . 604 0 . 70 1 . 50 0 . 59 4 . 318 85 . 96 0 . 12 13 . 20 . 612 0 . 71 1 . 00 0 . 62 3 . 734 85 . 26 0 . 10 13 . 30 . 619 0 . 72 1 . 00 0 . 65 3 . 179 84 . 65 0 . 07 13 . 40 . 626 0 . 73 1 . 00 0 . 67 2 . 698 84 . 16 0 . 06 13 . 50 . 633 0 . 74 1 . 00 0 . 69 2 . 074 83 . 80 0 . 05 13 . 60 . 641 0 . 75 1 . 00 0 . 71 1 . 599 83 . 59 0 . 04 13 . 70 . 648 0 . 76 1 . 00 0 . 72 1 . 348 83 .48 0 . 04 13 . 80 . 655 0 . 76 1 . 00 0 . 73 1 . 208 83 . 41 0 . 03 13 . 90 . 662 0 . 77 1 . 00 0 . 74 1 . 126 83 . 36 0 . 03 14 . 00 . 669 0 . 78 1 . 00 0 . 75 1 . 077 83 . 34 0 . 03 14 . 10 . 676 0 . 79 1 . 00 0 . 76 1 . 047 83 . 32 0 . 03 14 . 20 . 683 0 . 80 1 . 00 0 . 77 1 . 029 83 . 31 0 . 03 14 . 30 . 690 0 . 81 1 . 00 0 . 78 1 . 018 83 . 31 0 . 03 14 . 40 . 697 0 . 81 1 . 00 0 . 78 1 . 011 83 . 31 0 . 03 14 . 50 . 704 0 . 82 1 . 00 0 . 79 1 . 007 83 . 30 0 . 03 14 . 60 . 711 0 . 83 1 . 00 0 . 80 1 . 004 83 . 30 0 . 03 14 . 70 . 718 0 . 84 1 . 00 0 . 81 1 . 003 83 . 30 0 . 03 14 . 80 . 725 0 . 85 1 . 00 0 . 82 1 . 002 83 .30 0 . 03 14 . 90 . 733 0 . 86 1 . 00 0 . 83 1 . 001 83 . 30 0 . 03 15 . 00 . 740 0 . 86 1 . 00 0 . 83 1 . 001 83 . 30 0 . 03 15 . 10 . 747 0 . 87 1 . 00 0 . 84 1 . 000 83 . 30 0 . 03 15 . 20 . 754 0 . 88 1 . 00 0 . 85 1 . 000 83 . 30 0 . 03 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 100 YR RUNOFF WATERSHED Al 10 " ORIFICE TIME FRACTION CUM. AVG. CUM. OUTFLOW WATER STORAGE OF CUM. INFLOW INFLOW OUTFLOW RATE LEVEL RUNOFF RATE HRS AC-FT CFS AC-FT CFS AC-FT 15 . 30 . 761 0 . 89 1 . 00 0 . 86 1 . 000 83 . 30 0 . 03 15 .40 . 768 0 . 90 1 . 00 0 . 87 1 . 000 83 . 30 0 . 03 15 . 50 . 775 0 . 90 1 . 00 0 . 87 1 . 000 83 . 30 0 . 03 15 . 60 . 782 0 . 91 1 . 00 0 . 88 1 . 000 83 . 30 0 . 03 15 . 70 . 789 0 . 92 1 . 00 0 . 89 1 . 000 83 . 30 0 . 03 15 . 80 . 796 0 . 93 1 . 00 0 . 90 1 . 000 83 . 30 0 . 03 15 . 90 . 803 0 . 94 1 . 00 0 . 91 1 . 000 83 . 30 0 . 03 16 . 00 . 810 0 . 95 1 . 00 0 . 92 1 . 000 83 . 30 0 . 03 16 . 10 . 817 0 . 95 1 . 00 0 . 92 1 . 000 83 . 30 0 . 03 16 . 20 . 825 0 . 96 1 . 00 0 . 93 1 . 000 83 . 30 0 . 03 16 . 30 . 832 0 . 97 1 . 00 0 . 94 1 . 000 83 . 30 0 . 03 16 .40 . 839 0 . 98 1 . 00 0 . 95 1 . 000 83 . 30 0 . 03 16 . 50 . 846 0 . 99 1 . 00 0 . 96 1 . 000 83 . 30 0 . 03 16 . 60 . 852 0 . 99 0 . 80 0 . 97 0 . 956 83 . 28 0 . 03 16 . 70 . 857 1 . 00 0 . 60 0 . 97 0 . 855 83 . 22 0 . 03 16 . 80 . 860 1 . 00 0 . 40 0 . 98 0 . 723 83 . 14 0 . 02 16 . 90 . 862 1 . 01 0 . 20 0 . 99 0 . 575 83 . 05 0 . 02 17 . 00 . 863 1 . 01 -0 . 00 0 . 99 0 . 433 82 . 96 0 . 02 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 10 YR RUNOFF WATERSHED Al 10" ORIFICE BASIN AREA = 2 .42 ACRES TOTAL RUNOFF = 3 . 82 INCHES SPILLWAY LENGTH = 1 FT. SPILLWAY ELEVATION = 82 . 5 WEIR COEFFICIENTI = 1 . 4 WEIR HEAD EXPONENT 1 = 1 . 5 EQN. BREAKPOINT = 1 .46 WEIR COEFFICIENT 2 = 1 . 95 WEIR HEAD EXPONENT 2 = . 64 MAX. HYDROGRAPH TIME = 15 . 5 HRS . NUMBER OF INFLOW CURVE POINTS = 14 NUMBER OF STORAGE CURVE POINTS = 8 INFLOW DATA STORAGE DATA TIME INFLOW RATE STORAGE ELEV. STORAGE VOL. HRS . CFS FT. AC-FT 11 . 0 0 . 0 82 . 50 0 . 000 11 . 3 1 . 0 82 . 75 0 . 010 11 . 9 2 . 0 83 . 00 0 . 020 12 . 0 3 . 0 86 . 00 0 . 120 12 . 1 6 . 0 89 . 00 0 . 230 12 . 2 10 . 0 89 . 50 0 . 250 12 . 3 8 . 0 90 . 00 0 . 270 12 . 4 5 . 0 90 . 30 0 . 280 12 . 5 4 . 0 0 . 00 0 . 000 12 . 6 3 . 0 0 . 00 0 . 000 12 . 7 2 . 0 0 . 00 0 . 000 12 . 8 1 . 0 0 . 00 0 . 000 15 . 0 1 . 0 0 . 00 0 . 000 15 . 5 0 . 0 0 . 00 0 . 000 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 10 YR RUNOFF WATERSHED Al 10" ORIFICE TIME FRACTION CUM. AVG. CUM. OUTFLOW WATER STORAGE OF CUM. INFLOW INFLOW OUTFLOW RATE LEVEL RUNOFF RATE HRS AC-FT CFS AC-FT CFS AC-FT 11 . 00 . 000 0 . 00 0 . 00 0 . 00 0 . 000 0 . 00 0 . 00 11 . 10 . 002 0 . 00 0 . 33 0 . 00 0 . 010 82 . 54 0 . 00 11 . 20 . 008 0 . 01 0 . 67 0 . 00 0 . 071 82 . 64 0 . 01 11 . 30 . 017 0 . 01 1 . 00 0 . 00 0 . 215 82 . 79 0 . 01 11 . 40 . 028 0 . 02 1 . 17 0 . 00 0 . 421 82 . 95 0 . 02 11 . 50 . 042 0 . 03 1 . 33 0 . 01 0 . 682 83 . 12 0 . 02 11 . 60 . 057 0 . 04 1 . 50 0 . 01 0 . 951 83 . 27 0 . 03 11 . 70 . 074 0 . 06 1 . 67 0 . 02 1 . 202 83 . 40 0 . 03 11 . 80 . 093 0 . 07 1 . 83 0 . 03 1 . 432 83 . 52 0 . 04 11 . 90 . 114 0 . 09 2 . 00 0 . 05 1 . 645 83 . 61 0 . 04 12 . 00 . 141 0 . 11 3 . 00 0 . 06 2 . 070 83 . 80 0 . 05 12 . 10 . 191 0 . 15 6 . 00 0 . 08 2 . 883 84 . 34 0 . 06 12 . 20 . 279 0 . 21 10 . 00 0 . 11 3 . 979 85 . 55 0 . 10 12 . 30 . 374 0 . 29 8 . 00 0 . 15 4 . 811 86 . 60 0 . 14 12 . 40 . 443 0 . 34 5 . 00 0 . 19 5 . 043 86 . 91 0 . 15 12 . 50 . 490 0 . 38 4 . 00 0 . 23 4 . 950 86 . 79 0 . 15 12 . 60 . 527 0 . 41 3 . 00 0 . 27 4 . 712 86 . 47 0 . 14 12 . 70 . 554 0 . 43 2 . 00 0 . 31 4 . 343 85 . 99 0 . 12 12 . 80 . 569 0 . 44 1 . 00 0 . 34 3 . 799 85 . 33 0 . 10 12 . 90 . 580 0 . 45 1 . 00 0 . 37 3 . 235 84 . 71 0 . 08 13 . 00 . 591 0 . 45 1 . 00 0 . 39 2 . 746 84 . 21 0 . 06 13 . 10 . 601 0 . 46 1 . 00 0 . 42 2 . 147 83 . 83 0 . 05 13 . 20 . 612 0 . 47 1 . 00 0 . 43 1 . 636 83 . 61 0 . 04 13 . 30 . 623 0 . 48 1 . 00 0 . 44 1 . 369 83 . 49 0 . 04 13 . 40 . 633 0 .49 1 . 00 0 . 45 1 . 219 83 . 41 0 . 03 13 . 50 . 644 0 . 50 1 . 00 0 . 46 1 . 133 83 . 37 0 . 03 13 . 60 . 655 0 . 50 1 . 00 0 . 47 1 . 081 83 . 34 0 . 03 13 . 70 . 666 0 . 51 1 . 00 0 . 48 1 . 050 83 . 33 0 . 03 13 . 80 . 676 0 . 52 1 . 00 0 . 49 1 . 031 83 . 32 0 . 03 13 . 90 . 687 0 . 53 1 . 00 0 . 50 1 . 019 83 . 31 0 . 03 14 . 00 . 698 0 . 54 1 . 00 0 . 51 1 . 012 83 . 31 0 . 03 14 . 10 . 709 0 . 55 1 . 00 0 . 52 1 . 007 83 . 30 0 . 03 14 . 20 . 719 0 . 55 1 . 00 0 . 52 1 . 005 83 . 30 0 . 03 14 . 30 . 730 0 . 56 1 . 00 0 . 53 1 . 003 83 . 30 0 . 03 14 .40 . 741 0 . 57 1 . 00 0 . 54 1 . 002 83 . 30 0 . 03 14 . 50 . 751 0 . 58 1 . 00 0 . 55 1 . 001 83 . 30 0 . 03 14 . 60 . 762 0 . 59 1 . 00 0 . 56 1 . 001 83 . 30 0 . 03 14 . 70 . 773 0 . 60 1 . 00 0 . 57 1 . 000 83 . 30 0 . 03 14 . 80 . 784 0 . 60 1 . 00 0 . 57 1 . 000 83 . 30 0 . 03 14 . 90 . 794 0 . 61 1 . 00 0 . 58 1 . 000 33 . 30 0 . 03 15 . 00 . 805 0 . 62 1 . 00 0 . 59 1 . 000 83 . 30 0 . 03 15 . 10 . 815 0 . 63 0 . 80 0 . 60 0 . 956 83 . 28 0 . 03 15 . 20 . 822 0 . 63 0 . 60 0 . 61 0 . 855 83 . 22 0 . 03 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 10 YR RUNOFF WATERSHED Al 10" ORIFICE TIME FRACTION CUM. AVG. CUM. OUTFLOW WATER STORAGE OF CUM. INFLOW INFLOW OUTFLOW RATE LEVEL RUNOFF RATE HRS AC-FT CFS AC-FT CFS AC-FT 15 . 30 . 827 0 . 64 0 . 40 0 . 61 0 . 723 83 . 14 0 . 02 15 . 40 . 830 0 . 64 0 . 20 0 . 62 0 . 575 83 . 05 0 . 02 15 . 50 . 831 0 . 64 -0 . 00 0 . 62 0 .433 82 . 96 0 . 02 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 2 YR RUNOFF WATERSHED Al 10" ORIFICE BASIN AREA = 2 . 42 ACRES TOTAL RUNOFF = 2 .45 INCHES SPILLWAY LENGTH = 1 FT. SPILLWAY ELEVATION = 82 . 5 WEIR COEFFICIENTI = 1 . 4 WEIR HEAD EXPONENT 1 = 1 . 5 EQN. BREAKPOINT = 1 .46 WEIR COEFFICIENT 2 = 1 . 95 WEIR HEAD EXPONENT 2 = . 64 MAX. HYDROGRAPH TIME = 13 . 8 HRS . NUMBER OF INFLOW CURVE POINTS = 13 NUMBER OF STORAGE CURVE POINTS = 8 INFLOW DATA STORAGE DATA TIME INFLOW RATE STORAGE ELEV. STORAGE VOL. HRS . CPS FT. AC-FT 11 . 0 0 . 0 82 . 50 0 . 000 11 . 6 1 . 0 82 . 75 0 . 010 11 . 9 2 . 0 83 . 00 0 . 020 12 . 0 2 . 0 86 . 00 0 . 120 12 . 1 4 . 0 89 . 00 0 . 230 12 . 2 6 . 0 89 . 50 0 . 250 12 . 3 5 . 0 90 . 00 0 . 270 12 . 4 3 . 0 90 . 30 0 . 280 12 . 5 2 . 0 0 . 00 0 . 000 12 . 6 2 . 0 0 . 00 0 . 000 12 . 7 1 . 0 0 . 00 0 . 000 13 . 6 1 . 0 0 . 00 0 . 000 13 . 8 0 . 0 0 . 00 0 . 000 FLOOD ROUTING-SPILLWAY 2-3 : TR55 TABULAR INPUT RIDGESIDE APARTMENTS - SALEM PROPOSED 2 YR RUNOFF WATERSHED Al 10" ORIFICE TIME FRACTION CUM. AVG. CUM. OUTFLOW WATER STORAGE OF CUM. INFLOW INFLOW OUTFLOW RATE LEVEL RUNOFF RATE HRS AC-FT CFS AC-FT CFS AC-FT 11 . 00 . 000 0 . 00 0 . 00 0 . 00 0 . 000 0 . 00 0 . 00 11 . 10 . 002 0 . 00 0 . 17 0 . 00 0 . 004 82 . 52 0 . 00 11 . 20 . 006 0 . 00 0 . 33 0 . 00 0 . 026 82 . 57 0 . 00 11 . 30 . 013 0 . 01 0 . 50 0 . 00 0 . 080 82 . 65 0 . 01 11 .40 . 023 0 . 01 0 . 67 0 . 00 0 . 171 82 . 75 0 . 01 11 . 50 . 036 0 . 02 0 . 83 0 . 00 0 . 297 82 . 86 0 . 01 11 . 60 . 051 0 . 03 1 . 00 0 . 01 0 . 453 82 . 97 0 . 02 11 . 70 . 071 0 . 03 1 . 33 0 . 01 0 . 688 83 . 12 0 . 02 11 . 80 . 096 0 . 05 1 . 67 0 . 02 0 . 993 83 . 30 0 . 03 11 . 90 . 127 0 . 06 2 . 00 0 . 03 1 . 338 83 .47 0 . 04 12 . 00 . 161 0 . 08 2 . 00 0 . 04 1 . 616 83 . 60 0 . 04 12 . 10 . 212 0 . 10 4 . 00 0 . 05 2 . 334 83 . 91 0 . 05 12 . 20 . 298 0 . 15 6 . 00 0 ., 08 3 . 047 84 . 51 0 . 07 12 . 30 . 389 0 . 19 5 . 00 0 . 10 3 . 542 85 . 04 0 . 09 12 . 40 . 454 0 . 22 3 . 00 0 . 13 3 . 606 . 85 . 11 0 . 09 12 . 50 . 495 0 . 24 2 . 00 0 . 16 3 . 368 84 . 85 0 . 08 12 . 60 . 529 0 . 26 2 . 00 0 . 19 3 . 080 84 . 54 0 . 07 12 . 70 . 553 0 . 27 1 . 00 0 . 21 2 . 714 84 . 18 0 . 06 12 . 80 . 570 0 . 28 1 . 00 0 . 23 2 . 098 83 . 81 0 . 05 12 . 90 . 586 0 . 29 1 . 00 0 . 25 1 . 611 83 . 60 0 . 04 13 . 00 . 603 0 . 30 1 . 00 0 . 26 1 . 355 83 . 48 0 . 04 13 . 10 . 620 0 . 31 1 . 00 0 . 27 1 . 211 83 .41 0 . 03 13 . 20 . 636 0 . 31 1 . 00 0 . 28 1 . 128 83 . 37 0 . 03 13 . 30 . 653 0 . 32 1 . 00 0 . 29 1 . 078 83 . 34 0 . 03 13 . 40 . 670 0 . 33 1 . 00 0 . 30 1 . 048 83 . 32 0 . 03 13 . 50 . 687 0 . 34 1 . 00 0 . 31 1 . 030 83 . 31 0 . 03 13 . 60 . 703 0 . 35 1 . 00 0 . 32 1 . 018 83 . 31 0 . 03 13 . 70 . 715 0 . 35 0 . 50 0 . 33 0 . 901 83 . 25 0 . 03 13 . 80 . 719 0 . 36 -0 . 00 0 . 33 0 . 656 83 . 10 0 . 02 RATIONAL PIPE DESIGN RATIONAL PIPE DESIGNS ;' ; YEAR STORM EVENT LOCATION I C I A A x C FLOW TIME i Q DESIGN PROFILE a w 16 U E r= F- F- w W Q v Q U d E N J3L a w w U Zx U wN z_ zzp _ z a z o z 0 a � = a a w z i w w :E 1- Z w ._ a_ a0 ~ H z Q iY w w O a w w d N 0 0 K O Q w z W O U -� w w w w w z z z w a 3 z ~ c=i > > > 0.3 0.05 0.02 CB Al-7-1 0.9 0.20 0.18 93.50 95.50 DMH Al-7 0.25 0.20 5.00 5.3 s�, I RCP 12 0.0054 0.013 3.3 3.3 140 0.75 90.00 89.25 0.72 0.3 0.00 0.00 DMH Al-7 0.9 0.00 0.00 95.50 94.00 DMH Al-6 0.25 0.20 5.72 5.2 if s "RCP 12 0.0075 0.013 E 3.9 3.7 80 0.60 8'9 25 88.65 0.36 0.3 0.14 1 0.04 CB Al-6-1 0.9 0.17 1 0.15 93.80 94.00 DMH Al-6 0.31 0.20 5.00 5.3 r: U`1 : RCP 12 0.0200 0.013 xl 6.4 5.3 5 0.10 88.75 88.65 0.02 0.3 0.00 0.00 DMH Al-6 0.9 0.00 0.00 94.00 95.10 DMH Al-5 0.56 1 0.39 6.08 1 5.2 RCPj 15 1 0.0080 0.013 HH 4.7 4.4 75 0.60 88.40 87,80 0.28 0.3 0.00 0.00 DMH Al-5 0.9 0.00 0.00 95.10 93.20 DMH Al-4 0.56 0.39 6.36 1 5.1 #'N& $Pl %5IM � 4.6 4.4 105 0.80 87.80 87.00 0.40 0.3 0.10 0.03 CB Al-4-2 0.9 0.23 0.21 93.00 93.20 DMH Al-4 0.33 0.24 5.00 5.3 a V,�T 7.2 6.0 20 0.50 89.00 88.50 0.06 0.3 0.07 0.02 CB Al-4-1 0.9 0.18 0.16 93.00 93.20 DMH Al-4 0.25 0.18 5.00 5.3 RCP 12 0.0143 0.013 5.4 4.6 35 0.50 89.00 88.50 0.13 PROJECT: H.W. MOORE ASSOCIATES, INC. COMP. BY: TNU DATE : December 20, 1999 RIDGESIDE APARTMENTS CONSULTING ENGINEERS CHECK BY: REVISED: SALEM, MA BOSTON,MA JOB#: 1845 SHEET: 1 OF 7 1845-ralional2.als RATIONAL PIPE DESIGN a�, �_t;` YEAR STORM EVENT LOCATION C A A x C FLOW TIME i O DESIGN PROFILE } w m af w w ¢ ¢ w E N it v n a w w � a: x a ti w A r Zz TO I ? O W Q w ¢ .� 2 w a w z I n 2 Z w - o. O ~ z Q w w a N w ¢ w O z O a w O w af .� rr F K ~ ¢ w Z Vl s OJ p W w w w U Or Z m _� z w d 3 Z p >_ ] _ OJ z_ U 0.3 0.00 0.00 DMH Al-4 0.9 0.00 0.00 93.20 M2.4 DMH Al-3A 1.14 0.81 6.76 5.0 RCP 15 0.0095 0.013 5.1 5.6 200 1.90 87.00 0.60 0.3 0.00 0.00 DMH Al-3A 0.9 0.00 0.00 94.90 DMH Al-3 1.14 0.81 7.36 4.9 )t RCP 15 0.0062 0.013 4.2 4.7 145 0.90 85.10 0.52 0.3 0.04 0.01 CB Al-3-1 0.9 0.21 0.19 92.00 92.40 DMH Al-3 0.25 0.20 5.00 5.3 PIR RCP 12 0.0250 0.0134X14 7.2 5.7 20 0.50 88.00 87.50 0.06 0.3 0.00 0.00 DMH Al-3 0.9 0.00 0.00 92.40 92.40 VTAl-2 1.39 1.01 7.36 4.9 RCP 15 0.0200 0.013 % 7.5 7.9 5 0.10 84.20 84.10 0.01 0.3 0.00 1 0.00 VT Al-2 0.9 0.00 1 0.00 92.40 93.00 DMH Al-1 1.39 1.01 7.37 4.9 RCP 15 0.0100 0.0131M 5.3 1 5.9 10 0.10 84.10 84.00 0.03 0.3 0.06 0.02 CBAl-11-1 0.9 0.20 0.18 92.00 93.70 DMH Al-11 0.26 0.20 5.00 5.3 ' RCPI 12 0.0091 0.013 �M 4.3 3.9 55 0.50 88.00 87.50 0.24 0.31 0.00 0.00 DMH Al-11 0.91 0.00 0.00 93.70 93.60 DMH Al-9 0.26 0.20 5.24 5.3 }a RCP 12 0.0200 0.013 �:' 6.4 5.1 15 0.30 87.50 87.20 0.05 PROJECT: H.W. MOORE ASSOCIATES, INC. COMP. BY : TNU DATE : December 20, 1999 RIDGESIDE APARTMENTS CONSULTING ENGINEERS CHECK BY: REVISED SALEM, MA BOSTON, MA JOB#: 1845 SHEET: 2 OF 7 1845-ralional2.als RATIONAL PIPE DESIGN YEAR YEAR STORM EVENT r� LTION C A A x C FLOW TIME i Q DESIGN PROFILE � c Q ¢ Ec;` Y;.j - M U � " d N �' ' i �. m Z Z Z2 C) U z K z ¢ p w ¢ w ¢ w U = W a w z > ¢ ¢ W ¢ W O O W W J U W LL a' N U O U ~ ¢ W Z N 0 p J W W W W Z ~' z U 2 > j 7 0O Z U 0.31 0.18 0.05 CB Al-10-2 0.91 0.22 0.20 193.80 96.50 DMH Al-10 0,40 0.25 5.00 K5.3 CP 12 0.0063 0.013 : , 3.6 3.5 95 0.60 89.80 89.20 0.45 0.3 0.04 0.01CB Al-10-1 0.9 0.10 0.09 96.00 96.30 DMHAl-10 0.14 0.10 5.00 RCP 12 0.0111 0.013 ' 4.8 3.3 45 0.50 92.00 91.50 0.23 0.3 0.00 0.00 DMH Al-10 0.9 0.00 0.00 96.30 93.60 DMH Al-9 0.54 0.35 5.29 5.3 tK ,l RCP 12 0.0093 0.013 , 4.4 4.5 75 0.70 89.20 88.50 0.28 0.3 0.00 0.00 DMH Al-9 0.9 0.00 0.00 93.60 93.30 VT Al-8 0.80 0.55 5.57 5.3 WA RCP 12 0.0400 0.013 4 9.1 8.6 5 0.20 87.20 87.00 0.01 0.3 0.00 0.00 VT Al-8 0.9 0.00 0.00 93.30 93.00 DMH Al-1 0.80 0.55 5.57 5.3 'v. � RCP 12 0.0200 0.013 6.4 6.6 10 0.20 87.00 86.80 0.03 0.3 0.00 0.00 DMH Al-1 0.9 0.00 0.00 1 93.00 - TANK Al 2.19 1.56 7.39 4.9 =Qf/4� RCP 15 0.0200 0.013 7.5 8.4 10 0.20 84.00 83.80 0.02 PROJECT: H.W.MOORE ASSOCIATES, INC. COMP. BY: TNU DATE: December 20, 1999 RIDGESIDE APARTMENTS CONSULTING ENGINEERS CHECK BY: REVISED: SALEM, MA .BOSTON, MA JOB#: 1845 SHEET: 3 OF 7 1 B45-ralional2.zls RATIONAL PIPE DESIGN Oe YEAR STORM EVENT LOCATION C A A x C FLOW TIME Q DESIGN PROFILE W of 4 a a x a 0 c > z > z ul ? O? � a, j r_' w ¢ w ¢ w a a z . ° c~7 > > a N a H ( z O _ a;<o a w �' U a rr rr 0 0 U = w c`o' Z U W OJ ¢W. W w w 0.3 0.00 0.00 RD Al-1 0.9 0.23 0.21 TANK Al 0.23 0.21 5.00 5.3 M RCP 8 0.0500 0.013 1 7.8 Z3 10 0.50 90 00 89 50 0.02 0.3 0.00 0.00 RD Al-2 0.9 0.23 0.21 TANK Al 0.23 0.21 5.00 5.3 °� RCP 8 0.0500 0.013 7.8 7.3 10 0.50 90 00 89 50 0.02 T EW Al RCP 15 ANK Al Q,w FROM FLOOD-ROUTING CALCULATIONS 0.0250 6013 8.3 7.8 20 gO50 82.50 82.00 PROJECT: H.W.MOORE ASSOCIATES, INC. COMP. BY: TNU DATE: December 20, 1999 RIDGESIDE APARTMENTS CONSULTING ENGINEERS CHECK BY: REVISED: SALEM, MA BOSTON,MA JOB#: 1845 SHEET: 4 OF 7 1845-ralional2.xls RATIONAL PIPE DESIGN .Il YEAR STORM EVENT LOCATION C A A x C FLOW TIME i Q DESIGN PROFILE W X EOf 3 Q w Q U d .E .' N w >< a ti wcn t r > z > z U U W F- Q Z > } O ¢ ¢ o L a a r a }j _ p p K 7 w Q w Q W pU `- Y n w FL W w ¢ w O z w - - a - p E z LL w K w d. N K 1- K 1- O p w K � w � U O U Q w Z ( O W W W W Z ? U H = > > j 03 Z_ U 0.31 0.00 0.00 RD A2-5-2 0.9 0.23 0.21 d4.3 DW A2-5-1 0.23 0.21 5.00 5.3 RCP 8 0.0333 0.013 9 6.3 6.5 15 0.50 91.50 0.04 0.3 0.00 0.00 DW A2-5-1 0.9 0.00 0.00 94.50 DMH A2-5 0.23 0.21 5.04 5.3 O RCP 8 0.0333 0.013 6.3 6.5 15 0.50 91.00 0.04 0.3 0.00 0.00 RD A2-5-1 0.9 0.23 0.21 1 1 - 94.90 DW A2-5-1 0.23 0.21 5.00 5.3 RCP 8 0. 5500 0.013 J%M, 7.8 7.5 10 0.50 1 9L50 91. 00 0.02 0.3 0.00 0.00 DW A2-5-1 0.9 0.00 0.00 94.90 94.30 DMH A2-5 0.23 0.21 5.02 5.3 t RCP 8 0.0125 0.013 ` ! 3.9 4.4 40 0.50 9L00 90.50 0.15 0.3 0.00 0.00 DMH A2-5 0.9 0.00 0.00 94.30 93.40 DMH A2-4 0.46 0.41 5.17 5.3 {h RCP 12 0.0077 0.013 4E' 4.0 4.4 155 1.20 90.20 89.00 0.58 0.3 0.00 0.00 DMH A2-4 0.9 0.00 0.00 1 93.40 92.70 DMH A2-3 0.46 0.41 5.76 5.2 NP4T'" RCP 12 0,0077 0,013 0,13- i' 4.0 4.4 65 0.50 89.00 88.50 0.25 0.3 0.00 0.00 RD A2-3-2 0.9 0.23 0.21 93.50 DW A2-3-2 0.23 0.21 5.00 5.3 ?F-f RCP 8 0.0500 0.013q - 7.8 7.5 10 0.50 90.00 89.50 0.02 PROJECT: H.W. MOORE ASSOCIATES, INC. COMP. BY : TNU DATE : December 20, 1999 RIDGESIDE APARTMENTS CONSULTING ENGINEERS CHECK BY: REVISED SALEM, MA BOSTON, MA JOB#: 1845 SHEET: 5 OF 7 1845-rawnal2 vls RATIONAL PIPE DESIGN ">YEAR STORM EVENT LOCATION C A A x C FLOW TIME i Q DESIGN PROFILE W w Q v Q W E N a W W U a A > > O w ¢ ¢ ¢ " a U a _ z O _z O z w v o >` U U z w z o c a ~ e. w - a, Lu F U z O « a w 1 - U U w LL w w w w N of U O U ~ _ z O d z F- ? Z F i > > O U 0.31 0.00 0.00 DW A2-3-2 0.9 0.00 0.00 93.50 92.70 DMH A2-3 0.23 0.21 5.02 5.3 RCP 8 0.0200 0.013 4.9 5.3 25 0.50 89.50 89.00 0.08 0.3 0.00 0.00 RD A2-3-1 0.9 0.23 0.21 - 93 000 DW A2-3-1 0.23 0.21 5.00 5.3 RCP 8 0.0500 0.013 i;, 7.8 7.5 10 0.50 90.00 89.50 0.02 0.3 0.00 0.00 DW A2-3-1 0.9 0.00 0.00 93.00 92.70 DMH A2-3 0.23 0.21 5.02 5.3 _ RCP 8 0,0333 0.013 6.3 6.5 15 0.50 89.50 89.00 0.04 0.3 0.00 0.00 DMH A2-3 0.9 0.00 0.00 92.70 92.00 DMH A2-2 0.92 0.83 6.01 5.2 ' RCP 12 0,0211 0.013 " 6.6 7.5 95 2.00 88.50 86.50 0.21 0.3 0.00 0.00 DMH A2-2 0.9 0.00 0.00 92.00 92.50 DMH A2-1 0.92 0.83 6.22 5.2 RCP 12 0.0250 0.013 7.2 8.1 20 0.50 86.50 86.00 0.04 0.3 0.00 0.00 DMH A2-7 0.9 0.90 0.81 102.00 93.60 DMH A2-6 0.90 0.81 5.00 5.3 "r` RCP 12 0.0483 0.013 10.0 10.5 60 2.90 92.50 89.60 0.10 0.3 0.00 0.00 DMH A2-6 0.9 0.00 0.00 93.60 92.50 DMH A2-1 0.90 0.81 5.10 5.3 ;ZM, Y RCP 12 0.0225 0.0131 7.7 160 3.60 89.60 86.00 0.35 PROJECT: H.W. MOORE ASSOCIATES, INC. COMP. BY: TNU DATE: December 20, 1999 RIDGESIDE APARTMENTS CONSULTING ENGINEERS CHECK BY: REVISED SALEM, MA BOSTON, MA JOB#: 1845 SHEET: 6 OF 7 1845-raiional2.xls RATIONAL PIPE DESIGN NOW&._ W YEAR STORM EVENT LOCATION C A A x C FLOW TIME i Q DESIGN PROFILE si W. w v EI- W W Q v Q U d E x N ? n n W W dJ NF UJ WJ , ( aO W 1 Z O 90 Z wLLW of m Z E Fr O O af W W J � J w JZ Q W W W W 0 ZN O ~ U � I 2 > > j OJ Z U 0.3 0.00 0.00 DMH A2-1 0.9 0.00 0.00 92.50 EW A2 1.82 1.64 6.26 5.2 4,.: RCP 18 0.0125 0.013 : ° 6.7 7.4 80 1.00 85.50 84.50 0.18 PROJECT: H.W. MOORE ASSOCIATES,INC. COMP. BY: TNU DATE : December 20, 1999 RIDGESIDE APARTMENTS CONSULTING ENGINEERS CHECK BY : REVISED: SALEM, MA ,BOSTON,MA JOB#: 1845 SHEET: 7 OF 7 1845-ralional2 As DRY WELL CALCULATIONS H.W:MOORE ASSOCIATES,INC. RIDGESIDE APARTMENTS PAGE Consulting Engineers DATE: 11/16/99 BOSTON,MA 02118 REVISED: DRY WELL CALCULATIONS DRY WELL DIAMETER D = 6.0 ft. DRY WELL HEIGHT H = 4.0 ft. SURROUND WITH CRUSHED STONE s1 = 2.0 ft. SET ON CRUSHED STONE s2 = 1.0 ft. D+ (s1 x 2) EFFECTIVE DIAMETER ED = 10.0 ft. H+s2 EFFECTIVE HEIGHT EH = 5.0 ft. (pi xD xH /OLUME 4 VP;, = 113.1 cf. [((pi x ED2 xH)-VP;dx0.3 4 Vsiees = 60.3 cf xED' xs2x0.3 4 VEoftom = 23.6 cf. TOTAL STORAGE VOLUME = 197 Cf. 'URFACE AREA (pi x ED x EH) Asides=lass 157.1 sf. x ED 4 Ape, = 78.5 sf. TOTAL SURFACE AREA = 236 St. SECTION A-A" PLAN VIEW" not to scale not to scale A •y 1:TY. 'ui:JiiiiTJ:i.. ,:f:r•J•r•: r•r•J•r•J� ........, .. ............. f yy y y y y.y.y y y k ln5pecti0n lid ?•r•J•i•r•}•. 'r.r•J•r•VA.' S•yyyyy • •yyy y y inspection lid varies r•r•J• •J•i:i•}•?. yy yy •yyyy� (�?y?y r r'J'J•J� 2.0 ft crushed stone yy'••y1 y, P•r•r•r J•J•� J•J•y � 0 0 0 yy {•y.y'y y.y� r•r•J• 0 0 a r E= J'r yr1r r:r i y F' y it ryr 4'ft ?L?ti? ry.y? r•r•r• ft r.i r y?1? :•J•J J�i:r�i y,y e•J•J•r yyy r{?1r E� O � � r;rir Fr•r.r. :i:i:}7 r•r•r °•-�., w��- s^�-'• 1.0 ft crushed stone K•yyy I y.y.•..v E� E� o E� r.r.r y,y, y,y .r•r•r•J J•J•J;ri ?S?S?y yyyyyyyL•y yyyy •yyyy?S?ti? �ryltifyrtl.. r:rtir:fl r•r•J•l•r•r•r•J•r•J•J•J•J•l•J•!• y.y.yy'y ti'••'y'••• .y.y.y.y.y.y.y.yy.y.y.y.y.y.y.y .y.y.y.y.y.y. v`•J.J.J.:.:. J.r.iV'.J.r.J. }}i:r1r1r1r;hyrtr'•ryr�}}}y,i}' A 1e45-dryre111l.xls " NOT FOR CONSTRUCTION USE H.W.MOORE ASSOCIATES,INC. RIDGESIDE APARTMENTS PAGE : Consulting Engineers DATE: 11/17/99 BOSTON,MA 02118 REVISED ON-SITE LEACHING CAPACITY BASED ON : SOIL SURVEY OF ESSEX COUNTY, MASSACHUSETTS, SOUTHERN PART PROVIDED BY : THE UNITED STATES DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONSERVATION SERVICE (USDA NRCS) PUBLISHED BY : USDA DATE : May-84 SOIL TYPES ON-SITE : CrD CHATFIELD - HOLLIS - ROCK OUTCROP COMPLEX, 15 TO 35% SLOPES Ur URBAN LAND HYDROL. SOIL GROUP : CID (ASSUMED) PERMEABILITY RANGE : 0.60 to 6.00 in/hr (ESTIMATED) 0.60 in/hr = 1.4E-05 fps. = 100 mpi. 6.00 in/hr = 1.4E-04 fps. = 10 mpi. SURFACE AREA OF DRY WELL = 236 sf. MINIMUM Leaching Rate of Dry Well 1.4E-05 fps x 236 Sf. = 0.0033 cfs. 0.0033 cfs = 283 cfd. MAXIMUM Leaching Rate of Div Well 1.4E-04 fps x 236 Sf. = 0.033 cfs. 0.033 cfs = 2,827 cfd. LEACHING RATE PER DRY WELL USED FOR CALCULATIONS = 283 cfd 1845d,ywelHl.xls STANDARD #3 RECHARGE TO GROUNDWATER H.W.MOORE ASSOCIATES,INC. RIDGESIDE APARTMENTS PAGE: Consulting Engineers DATE: 11/17/99 BOSTON,MA 02118 REVISED: STORMWATER MANAGEMENT POLICY STANDARD # 3 RECHARGE TO GROUNDWATER HYD. SOIL GROUP RECHARGE PER ACRE A = 0.40 in. B = 0.25 in. C = 0.10 in. D = 0.00 in. TOTAL EXISTING IMPERVIOUS AREA = 2.20 ac. TOTAL PROPOSED IMPERVIOUS AREA = 3.05 ac. NET INCREASE = 0.85 ac. HYD. SOIL GROUP A = 0.00 ac. B = 0.00 ac. C = 0.85 ac. D = 0.00 ac. 0.40 in. x 0.00 ac. x 1/12 = ac.-ft. 0.25 in. x 0.00 ac. x 1/12 = ac.-ft. 0.10 in. x 0.85 ac. x 1/12 = 0.01 ac.-ft. 0.00 in. x 0.00 ac. x 1/12 = ac.-ft. TOTAL RECHARGE VOLUME REQUIRED = 0.01 ac:ft./d = 309 cfd. TOTAL BUILDING ROOF AREA ON-SITE = 10.09 ac. ROOF AREA RUNOFF VOLUME (1/2-INCH RAINFALL EVENT) = 0.42 ac.-ft TOTAL NUMBER OF DRY WELLS ON-SITE = 4 CALCULATED LEACHING RATE (PER DRY WELL) = 283 cfd. TOTAL CALCULATED LEACHING RATE (DRY WELL) = 1,131 cfd. 0.03 ac.-ft/d TOTAL RECHARGE VOLUME PROVIDED = 0.03 ac:ft./d 0.03 ac.-ft. >>> 0.01 ac:ft RECHARGE O.K ! 1845-drywelliwa As AW 6 VORTECHS STORMWATER TREATMENT SYSTEM Vortechnics VS7 A y. W1 3t 'k4 ID:EaL OF iB.:iE:aOVEC lJ SEGq iFE=r'aEu'S7n:'CU9E. VORTECHS"' STORMWATER TREATMENT SYSTEM A major a(IN aneementin oil and grit separator(OGS)technology',t lie VortechsT"Stornnvater Treatment Scstrm efficirntk rr"moNes grit- contarninatod sediments, metals, hNdrocarhons and other floating pollutants from surface runoff. This innovative clesio i comtdTines tivo mLique treatment structures to elinunate turhtdence N%ithin the scstem—ensuring proper physical separation and capture of seclituent and oils. wvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv FEATURES: APPLICATIONS: High treatment efficient•_: ON er EOr/c of contaminated • Parking Lots sediment is removed during the --first flush". • Gas Stations • Innovative floe control: Seals off bottom of • Industrial Sites floatables barrier preventing loss of captured oils • Retail Outlets during clean-out. • Streets/Roadways • Large treatment capacitc• Even the heaviest storms • Vehicle Maintenance Facilities can be treated i6thout hvpassing peak flocs. • Wetlands Protection • Easy inspection—lover clean-out costs:Dn reather volume significantlY less than Nlith conaentional traps of the same size. PATENT PENDING 41 Grit Oil Flo.Commi Oijllat I Chamber Chamber Chamber Chamber FEATURES GRIT CHAMBER The SNkirling]notion created by the tangential directs settleable solids tomard the center. Duriner, peak storms this structure dissipates potentially disruptive flocs—sediment is caught in the Qviii-lin, flow path and settles back onto the pile after the storm event is over. OIL CHAMBER PIAN VIEW The center barrier traps floa t ables in the oil ch amber. Swirl Concentrator Oil Barrier Weir Fleas Unlike conventional oil traps that lack flow controls and extra tank capacity, the Vorteells", SN 4teill is highly resistant to flow surges. j FLOW CONTROL CHAMBER As the Storm event builds in intensity. the lcl,v-flow Control within the A.-Ortechs"' System kill cause the inlet piile to hecrinie submerged. 'this process floats lilt Oily pollutants up above the inlet pipe—and out of influent=treani. Tints. the V ortechs" qNstem keeps captured pollutants in the trap by reducing forces Iiihich clicunrige resllspcllsioli and 1%a>ll-out. ELEVATION VIEW Flow Corillel PHASES OF OPERATION I) DRY WEATHER/STORM SUBSIDENCE PHASE Treated 1-1111off is decanted out of the lis" S\st(-Ill at a controlled eiltC restoring the Water lelel to a 101% (Iry weather Nollinie. This low dry\kentherjeNel lint only facilitates visual ills]WCti(ol of sediment and floatables leclinudation but also silgllificalltlr%.decreases maintenance costs by re(hicill,ljjlllll)-Otlt volume. 2) INITIAL WET WEATHER PHASE During this phase (if operation a two-month storm event kill cause the water level to rise above the top of the inlet pipe. This flow control effectively reduces inlet velocity and turbillence. 8517c of storm e%ento(10 not exceed the initial met weather phase—sedinient and floatables reniorial during this stage is eery high. 4 3) TRANSITION PHASE Flow attenuation achieved during thus phase helps to utilize fully the storage capacityOf ztorni seiner pipes and the Vortechs"I System. To increase ztostorage i olullie further,Oil or off-line detention basins call be designed to W"6 L. fill (1111-irg, the transition phase. Swirling action increases at this stale ELEVATION VIEVI capturing Sediments and moving material which may have been deposited at inlet(during IOW flows)into the center of the chamber. 4) FULL CAPACITY PHASE During this phase, tile storni drains are operating at peak Capacity, typically at 5 to 2.5 year storin flovs, rates. To acconinlor ',neater voItIllleS, Vorteclinics can assist designers with C011figurina a peak floik,by-pass. Treatment efficiencies for the Vortech ST11 Svstein reDlaill constant during this phase, while conventional "phig, flow" OGSs have been slihi to fail and drop down to negative treatment efficiencies. COMPARISON OF VORTECHSTM SYSTEM SEDIMENT r REMOVAL TO CONVENTIONAL OIL GRIT SEPARATORS. 25 Mom System Z 20 — — — Conventent ional OGSs VORTECHSTVI SYSTEM PRODUCT PERFORMANCE a LU 15 ata for VortechsT" System obtained ~ W 10 / CONTAMINATED SEDIMENTSor actua rouuh in-field monitoring of l � LOST BY OGSs / torterhe"' stallation in Freeport, \'Taine. OGS data r� ` / leaned oat ken from comprehensive testing of ai 5 �!1 % ncentional systems by the department of nvironmental Programs, Metropolitan 0 ashington Council of Governments. J M M J S N J M M J 20 MONTH PERIOD "The greatest environmental riA appears to occur when metal and hvdrurarbon- laden srdinrentt are depu,ited in lorrn<trealn lake<and rsttarire... Runoff from urban hot spnC appear-to he a major aanribuling factor In sedinleut contamination in tlreie cases..... -Schnelrr and Slirpp. 1992 -McKrnzie and Hunter. 1979 VORTECHST11 SYSTEM Vortechs'll Grit Chamber Design Sediment Model Diant./Area Flow Rat SPECIFICATION e* Storage" Storage" rLTIV.fu 2000 4/ 13 2.8/ 1.300 1.2 350 10 x 4 D Plus 6'T,pical 3000 5 120 4.4/2.000 L8 510 11 x 5 4000 6/28 6.3/2.S00 2.4 700 12 x 6 `r1-,6�,e.,��m. 5000 7/38 8.6/3.800 3.2 920 13 x 7 / 7000 8/50 11.0/5.000 3.9 1200 14 x 8 9000 9/64 14.0/6.400 4.7 1 1 500 1 15 x 9 11000 10/79 18.0/7 900 5.5 1800 16 x 10 16000 I2/ t 13 25.0/ 1 L000 7S 2 500 1 S x 12 Design flow rate is based on a peak operating rate of 100 gpm/It'in a 10-year storm. LAN VIEW — Oil and sediment storage volumes given assume a 3 it deep sump and a 1 It opening under the oil baffle. These dimensions may vary. l e«formed ev�eo \ ATTENTION SPECIFIERS Use the enclosed Specifiier's Worksheet to begin the deign of}our VortechsT11 S.=tem. Simpl} fax completed lvorksheet to the Vortechnics Engineering I Office (Fax No: 207-878-8507) and nce'll produce detailed scale drawings based on your site specific information (free of charge). 3'io" 6'io 9' / " Note: Availability of models and actual dimensions may vary. Check With _ Vortechnics or your local licensed nnanu fact itrer for specific information. T 1., EVATION VIEW PATENT PENDING IVIAINA.�'ANCE rhe W. Vortechs"' Sy on-going has no on-� A Oln�g maintenance requirements To Pump Truck 31thouzh routine inspections are necessary to schedule clean.' To ensure proper performance and treatment efficiency the system rust be cleaned when it is full. The IlorteCIISTII System is designed to effectively capture sediment and floatables—the rate at which the !vstelli accumulates contaminants is largely dependent on site J letiN ities. NSPECTION ........... n the first Near of operation, Vortechilics recommends monthly nspections durin.-periods of heavy contaniinantloadings(e.L' -.! a n di nas I soil di still-])all ces or oil/ fuel spills).The inspection schedule can then be modified in subsequent years according to experience ,r to meet specific storlimater permit requirements. :LEANING ;lean-out of the N7OrteClIST1I SN-Steln with a vacuum truck is generally the best and Illort convenient bore the grit chanibul (tile one farthest from the sA ient method. 0111v the manhole CON Or . stem outlet) needs to be opened to rellioN v water and contaminants. As the grit halliber is ro"I'lled out. the oil and water drain back into it. so that oil Scion, particulates and floataljles are removed 11oll-',with (cumulated sediments. With the N"',rtech-s" System. a pocket of water livtNA cell the grit Chandjer and (]( % controls seals the -o ttol f the oil barrier and presents the loss of floatables to the outIct(1111-im"cleanings. Manhole vmvrs should be S(. CurvIN seated 5111(M im, leaning activities to ensure surface runoff does not leak into unit fromjIboN(. INSTALLATION OF A VORTECHSTI MODEL 11000 VORTECHS T11 STORMWATER TREATMENT SYSTEM YYYTVTTVVVVVTTVVVVTVVVVVVVTVVVVVVV Vortechnics 'US7 VORTECHNICS 41 EVERGREEN DRIVE PORTLAND,ME 04103 (1017)878-3662 FAX:878-8307