64-355 - 24 SAUNDERS STREET - CONSERVATION COMMISSION _ llEP#64-355 - NOI _
24 Saunders Street, Subdivision
12/10/2004 14:13 FAX 9785312479 JOHN KEILTY. ESQ IM 02
JOHN R. MELTY, COUNSELOR AT LAW
40 LOWELL STREET TELEPHONE (978) 531-7900
PEABODY, MA 01960 FACSIMILE (978) 831-2479
December 10,2004
Via Facsimile Transmission
Conservation Commission
City of Salem
120 Washington Street
Salem,MA 01970
Attn: Frank Toormina,Conservation Commission Agent
and Members of the Salem Conservation Commission
Re: 24 Saunders Street,Salem,Massachusetts
DEP File No.64-0355(Subdivision)
Dear Mr.Toormina and Members
of the Conservation Commission:
I represent Julianne Tache,Trustee of Riverside Realty Trust with regard to the
application for the issuance of an Order of Conditions allowing the construction of a
Definitive Subdivision.
Please accept this letter as Ms.Tache's withdrawal of the application for the
issuance of an Order of Conditions inasmuch as the Commonwealth of Massachusetts
Right of Way Bureau has taken much of the land in an Eminent Domain proceeding
which has now frustrated the applicant's attempts to develop the land.
Kindly contact me with any questions you may have,
Very Duly yours,
John R Keilty, f
JRK/emb
cc: Julianna Tache(via fax)
Massachusetts Department of Environmental Protection DEP File Number:
Bureau of Resource Protection -Wetlands
WPA Form 3 — Notice of Intent Provided byDEP
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 SalemTown
A. General Information
Important:
When filling out 1. Applicant:
forms on the Riverside Realty Trust
computer, use Name
only the tab E-Mail Address
key to move 208 Derby Street
.your cursor- Mailing Address
do not use the Salem MA 01970
return key. City/Town State Zip Code
r' 978-745-2004
`..« Phone Number Fax Number(if applicable)
2. Representative (if any):
Firm
Attorney John R. Keilty
Note: Contact Name E-Mail Address
Before 40 Lowell Street
completing this Mailing Address
form consult al l
your local Peabody MA 01960
Conservation Cityrrown - State Zip Code
Commission 978-531-7900
regarding any Phone Number Fax Number(if applicable)
municipal bylaw
or ordinance. 3. Property Owner(if different from applicant):
Same
Name
Mailing Address
city/Town State Zip Code
4. Total Fee:
6,300.00
(from Appendix B:Wetland Fee Transmittal Form)
5. Project Location:
24 Saunders Street Salem
Street Address - City/Town
36 87
Assessors Map/Plat Number Parcel/Lot Number
6. Registry of Deeds:
Essex So. District 20983 187
County Book Page
Certificate(if Registered Land)
Massachusetts Department of Environmental Protection DEP File Number:
Bureau of Resource Protection -Wetlands
WPA Form 3 — Notice of intent Provided by DEP
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Salem
Town
A. General Information (cunt.)
7. Summary of Project Impacts:
a. Is any work being proposed in the Buffer Zone?
® Yes If yes, how many square feet?
55 QO
Square Feet
❑ No
b. List the impacts of proposed activities on each wetland resource areas (temporary and permanent
impacts, prior to restoration and mitigation):
Resource Area Size of Impact(e.g., sq.ft.)
Riverfront 28,700 Permanent
(76,000 Temporary)
B. Project Description
1. General Project Description:
Extension of existing streets, construction of six duplex dwellings, grading, utilities, landscaping and
stormwater management facilities.
2. Plan and/or Map References:
Definitive Subdivision Plan 05-16-03
Title Date
Title Date
Massachusetts Department of Environmental Protection DEP File Number
Bureau of Resource Protection -Wetlands
WPA Form 3 — Notice of intent Provided by DEP
Massachusetts Wetlands Protection Act M.G.L. c. 131 §40 Salem
Town
C. Activities Subject to Regulation
t. a. Check the applicable resource areas if work is to be conducted in an associated Buffer Zone:
Inland Resource Areas Coastal Resource Areas
❑ Inland Bank ❑ Coastal Beach ❑ Barrier Beach
❑ Bordering Vegetated Wetland (BVW) ❑ Rocky Intertidal Shore ❑ Coastal Dune
❑ Salt Marsh ® Coastal Bank
b. Complete for all pkroposed activities located, in whole or in part, in Wetland Resource Area(s).
Inland Resource Areas:
Bordering Vegetated Wetlands: Bordering Land Subject to Flooding:
Square Feet altered Volume of Flood Storage Lost(cubic feet)
Square Feet replaced Volume of Flood Storage Compensation(cubic feet)
Land Under Water Bodies: Isolated Land Subject to Flooding:
Square Feet altered Volume of Flood Storage Lost(cubic feet)
Cubic Yards dredged Volume of Flood Storage Compensation(cubic feet)
Bank:
Linear Feet altered
Coastal Resource Areas:
Coastal Dune: Land Under Salt Pond:
Square Feet altered Square Feet altered
Cubic Yards/Volume removed Cubic Yards dredged
Salt Marsh: Rocky Intertidal Zone:
Square Feet altered Square Feet altered
Coastal Bank: Designated Port Area:
Linear Feet altered Square Feet altered
Massachusetts Department of Environmental Protection DEP File Number:
Bureau of Resource Protection -Wetlands
WPA Form 3 — Notice of Intent Provided by DEP
7L Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 SalemTown
C. Activities Subject to Regulations (cont.)
Fish Run: Land Containing Shellfish:
Linear Feet altered Square Feet altered
Land Subject to Coastal Storm Flowage: Beach:
Square Feet altered Square Feet altered
Land Under Ocean:
Square Feet altered
Cubic Yards dredged
Riverfront Area:
a. Name of Waterway (if available):
North River
b. Width of Riverfront Area (check one):
❑ 25 ft. - Designated Densely Developed Areas only
❑ 100 ft. - New agricultural projects only
® 200 ft. -All other projects
c. Describe how the Mean Annual High-Water Line was determined:
Mean Annual High Tide
d. Distance of proposed activity closest to the Mean Annual High-Water line:
55
Feet
e. Total area of Riverfront Area on the site of the proposed project:
83,900
Square Feet
f. Proposed alteration of the Riverfront Area:
28,700 5,500 23,200
Total Square Feet Square Feet within 100 ft. Square Feet between�100 ft.and 200 ft.
f
Massachusetts Department of Environmental Protection DEP File Number:
Bureau of Resource Protection -Wetlands
WPA Form 3 — Notice of Intent Provided by DEP
Salem
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Town
C. Activities Subject to Regulation (cunt.)
2. Check all methods used to delineate the Bordering Vegetated Wetland (BVW) boundary:
❑ Final Order of Resource Area Delineation issued by Conservation Commission or DEP (attached)
❑ DEP BVW Field Data Form (attached)
❑ Final Determination of Applicability issued by Conservation Commission (attached)
❑ Other Methods for Determining the BVW boundary (attach documentation):
❑ 50% or more wetland indicator plants
❑ Saturatedfinundated conditions exist
❑ Groundwater indicators
❑ Direct observation
❑ Hydric soil indicators
❑ Credible evidence of conditions prior to disturbance.
3. a. Is any portion of the proposed project located in estimated habitat as indicated on the most
recent Estimated Habitat Map of State-Listed Rare Wetland Wildlife published by the Natural
Heritage and Endangered Species Program?
❑ Yes If yes, include proof of mailing or hand delivery of NOI to
Natural Heritage and Endangered Species Program
Division of Fisheries and Wildlife
Route 135, North Drive
Westborough, MA 01581
® No
2000-2001 Atlas
Date of Map
b. Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)?
❑ Yes If yes, provide name of ACEC (see Appendix D for ACEC locations):
ACEC
® No
c. Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands
Restriction Act(M.G.L. c. 131, §40A) or the Coastal Wetlands Restriction Act (M.G.L. c. 130, § 105)?
❑ Yes
® No
z,
Massachusetts Department of Environmental Protection DEP File Number:
Bureau of Resource Protection -Wetlands
WPA Form 3 — Notice of Intent Provided by DEP
Salem
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Town
D. Performance Standards
1. Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR
10.24 or 310 CMR 10.53?
❑ Yes If yes, describe which limited project applies to this project:
Limited Project
® No
2. Is any activity within any Resource Area or Buffer Zone exempt from performance standards of the
wetlands regulations, 310 CMR 10.00.
❑ Yes If yes, describe which exemption applies to this project:
Exemption
® No
3 a. Is the project located in the Riverfront Area?
® Yes If yes, indicate the proposed project purpose:
❑ Single Family House ❑ Industrial Development
® Residential Subdivision ❑ Commercial Development
❑ Transportation ❑ Other(describe)
b. Was the lot where the activity is proposed created prior to August 1, 1996?
® Yes
❑ No
4. a. Describe how the project will meet all performance standards for each of the resource areas
altered, including standards requiring consideration of aftemative project design or location.Attach
narrative and supporting documentation.
b. Is this project exempt from the DEP Stormwater Policy?
❑ Yes If yes, explain why the project is exempt::
® No If no, stormwater management measures are required. Applicants are encouraged to
complete Appendix C: Stormwater Management Form and submit it with this forth.
Massachusetts Department of Environmental Protection DEP File Number:
Bureau of Resource Protection -Wetlands
WPA Form 3 - Notice of Intent Provided by DEP
Salem
Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Town
E. Additional Information
Applicants must include the following with this Notice of Intent(NOI):
• USGS or other map of the area (along with a narrative description, if necessary), containing sufficient
information for the Conservation Commission and the Department to locate the site.
• Plans identifying the location of proposed activities (including activities proposed to serve as a
Bordering Vegetated Wetland (BVW) replication area or other mitigating measure) relative to the
boundaries of each affected resource area.
• Other material identifying and explaining the determination of resource area boundaries shown on
plans (e.g., a DEP BVW Field Data Form).
• List the titles and final revision dates for all plans and other materials submitted with this NO].
F. Fees
The fees for work proposed under each Notice of Intent must be calculated and submitted to the
Conservation Commission and the Department(see Instructions and Appendix B.Wetland Fee
Transmittal Form).
No fee shall be assessed for projects of the federal government, the Department, or cities and towns of
the Commonwealth.
Applicants must submit the following information (n addition to pages 1 and 2 of Appendix B)to confirm
fee payment:
Check Number Check datW
J6 }w R. 11 11 w TQ. Ju,1,aK,uc ) tc,4 Truslu
Payor name on check Applicant naf different from p3yor)
me i
t wt s r- �(J Wa YAW.
G. Signatures and Submittal Requirements
I hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying
plans, documents, and supporting data are true and complete to the best of my knowledge. I understand
that the Conservation Commission will place notification of this Notice in a local newspaper at the
expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a).
I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the
requirements of M.G.L. c. 131, §40. Notice must be made in writing by hand defivery or certified mail
(return re 'pt requested)to all abutters within 100 feet of the property line of the project location.
` T
ig re of Applicant
� 'uA to
Signature of Property Owner(if different) Date x7
Sign a re o resentatly ( Date
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. 131, §40
Important: A. Applicant Information
When filling out
forms on the 1. Applicant:
computer, use
only the tab Riverside Realty Trust
key to move Name
your cursor- 208 Derby Street
do not use the Mailing Address
return key. Salem MA 01970
Cityrrown State Zip Code
;rim 11 978-745-2004
Phone Number
E�A 2. Property Owner(if different):
Same
Name
Mailing Address
Cftyrrown State Zip Code
Phone Number
3. Project Location:
24 Saunders Street Salem
Street Address Cityrrown
B. Fees
To calculate
filing fees, refer Abbreviated Notice of Resource Area Delineation (Form 4A):
to the category
fee list and The fee is calculated as follows (check applicable project type):
examples in
Section of
this form.. El family house project
X$1.00=
(feet of BVW) Total fee(not to exceed$100)
❑ all other projects
X$1.00=
(feet of BVW) Total fee(not to exceed$1,000)
State share of filling fee:
(1/2 of total fee less$12.50)
City/Town share of filling fee:
(1/2 of total fee plus$12.50)
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. 131, §40
B. Fees (cont.)
Abbreviated Notice of Intent(Form 4)or Notice of Intent(Form 3):
The fee should be calculated using the following six-step process and worksheet:
Step 1/Type of Activity: Describe each type of activity (see Section D for a list of activities) that will
occur in wetland resource area and buffer zone.
Step 2/Number of Activities: Identify the number of each type of activity.
Step 3/lndividual Activity Fee: Identify each activity fee from the six project categories in Section D.
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 5rrotal Project Fee: Determine the total project fee by adding the subtotal amounts from 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.
Step 1/Type of Activity Step 2/Number Step 3/Individual Step 4/Subtotal
of Activities Activity Fee Activity Fee
3 b- Proposed Buildings 6 $525 x 1.5 $4,725.00
3 c- Roadway 2 $525 x 1.5 $1,575.00
Step 5/Total Project Fee:$6,300.00
Step 6/Fee Payments:
Total Project Fee:$6,300.00
(Total fee from Step 5)
State share of filing fee:$3,137.50
(12 total fee less$12.50)
City/Town share of filling fee:$3,162.50
(12 total fee plus$12.50)
DATE INVOICE AMOUNT
JOF/NK. KEILTY, ESQUIRE s3 179
I13
�.�oIlN.S'Clllr at La it,
TO I.0WI;LI'S'I'It lil•`I'
PEABODY, MASSACHUSEI-I'S Dl()(,D No 9508
'
PAMOUNT � flOLLARS
TE TO THE ORDER OF GROSS AMT.
—e— /) / - I R7 DESCRIPTION NET AMOUNT
Sti
Eastern Bank -Lynn, MA aun I SIG a E
R•00950811• I:0 i 13017981: 60 001, 38
JOHN R. KULTY, ESQUIRE DATE INVOICE AMOUNT 113
53-179
Cofufselor at Lnm
JO LOW ELL STREET
PEABODY, MASSACHUSETTS 01960 N° 9509
PAMOUNT ( DOLLARS
D TE I TO THE ORDER OF GROSS AMT. DESCRIPTI NET AMOUNT
1117
OEasternBank -Lynn, MA 11 111 E0SIGN nE
11•00950911' 1:0113017981: 60 0045 D•
L71� 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
A. Property Information
Important:
when filling out 1. The proposed project is: .
forms on the
computer, use
only the tab New development M Yes
key to move
your cursor- ❑ No
do not use the
return key.
' Redevelopment ® Yes
-A -e
❑ No
Combination ® Yes (If yes, distinguish redevelopment components from new
development components on plans).
Note: ❑ No
This November
2000 version of
the Stormwater 2. Stormwater runoff to be treated for water quality are based on which of the following calculations:
Management
Form supersedes ® 1 inch of runoff x total impervious area of post-development site for discharge to critical areas
earlier versions (Outstanding Resource Waters, recharge areas of public water supplies, shellfish growing areas,
including those swimming beaches, cold water fisheries).
contained in
DEP's
Stormwater ❑ 0.5 inches of runoff x total impervious area of post-development site for other resource areas.
Handbooks.
3. List all plans and documents (e.g. calculations and additional narratives) submitted with this form:
Definitive Subdivision Plan- Riverview
Stormwater Management Plan - Riverview-Salem, MA.
B. Stormwater Management Standards
DEP's Stormwater Management Policy(March 1997) includes nine standards that are listed on the
following pages. Check the appropriate boxes for each standard and provide documentation and
additional information when applicable.
Standard#1: Untreated storrnwater
M The project is designed so that new sormwater point discharges do not discharge untreated
stormwater into, or cause erosion to, wetlands and waters.
LAIMassachusetts 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
B. Stormwater Management Standards (cont.)
Standard#2: Post-development peak discharges rates
❑ Not applicable—project site contains waters subject to tidal action.
Post-development peak discharge does not exceed pre-development rates on the site at the point of
discharge or downgradient property boundary for the 2-yr, 10-yr, and 100-yr, 24-hr storm.
❑ without stormwater controls
® with stormwater controls designed for the 2-yr, and 10-yr storm, 24-hr storm.
® the project as designed will not increase off-site flooding impacts from the 100-yr,24-hr storm.
Standard#3: Recharge to groundwater
Amount of impervious area (sq. ft.)to be infiltrated:
Volume to be recharged is based on:
❑ The following Natural Resources Conservation Service hydrologic soils groups (e.g. A, B, C. D, or
UA) or any combination of groups:
(%of impervious area) (Hydrologic soil group) (%of impervious area) (Hydrologic soil group)
(%of impervious area) (Hydrologic soil group) (%of impervious area) (Hydrologic soil group)
® Site specific pre-development conditions:
Recharge rate Volume
Describe how there calculations were determined:
Based on Site testing, used HSG "A"(USDA Classification = urban soils)
List each BMP or nonstructural measure used to meet Standard#3. (e.g. dry well, infiltration trench).
Dells, Infiltration Basin
Does the annual groundwater recharge for the post-development site approximates the annual
recharge from existing site conditions?
® Yes
❑ No
L71� 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
B. Stormwater Management Standards (cont.)
Standard#4: 80% TSS Removal
® The proposed stormwater management system will remove 80% of the post-development site's
average annual Total Suspended Solids (TSS) load.
Identify the BMP's proposed for the project and describe how the 80% TSS removal will be achieved.
Deep Sump Catch Basins, Infiltration Basin, Drywells
If the project is redevelopment, explain how much TSS will be removed and briefly explain why 80%
removal cannot be achieved.
Standard #5: Higher potential pollutant loads
See Stormwater Does the project site contain land uses with higher potential pollutant loads
Policy Handbook
Vol. I, page 1-23,
for land uses of ❑ Yes If yes, describe land uses:
high pollutant
loading
® No
Identify the BMPs selected to treat stormwater runoff. If infiltration measures are proposed, describe
the pretreatment. (Note: If the area of higher potential pollutant loading is upgradient of a critical area,
infiltration is not allowed.
Standard #6: Protection of critical areas
See Stormwater Will the project discharge to or affect a critical area?
Policy Handbook
Vol. I, page 1-25,
for critical areas. ❑ Yes If yes, describe areas:
No Site Discharge
® No
z.
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
B. Stormwater Management Standards (cont.)
Identify the BMPs selected for stormwater discharges in these areas and describe how BMPs meet
restrictions listed on pages 1-27 and 1-28 of the Stormwater Policy Handbook—Vol. I:
Note:
components of Standard#7: Redevelopment projects
redevelopment
projects which Is the proposed activity a redevelopment project?
plan to develop
previously E Yes If yes,the following stormwater management standards have been met:
undeveloped
areas do not fall
under the scope
of Standard 7.
❑ No
The following stormwater standards have not been met for the following reasons:
E The proposed project will reduce the annual pollutant load on the site with new or improved
stormwater control.
Standard#8: Erosion/sediment control
E Erosion and sediment controls are incorporated into the project design to prevent erosion, control
sediments, and stabilize exposed soils during construction or land disturbance.
Standard #9: Operation/maintenance plan
E An operation and maintenance plan for the post-development stormwater controls have been
developed. The plan includes ownership of the stormwater BMPs, parties responsible for operation
and maintenance, schedule for inspection and maintenance, routine and long-term maintenance
responsibilities, and provision for appropriate access and maintenance easements extending from a
public right-of-way to the stormwater controls.
Stormwater Operations and Maintenance Plan
PlaNT@le Date
Riverview Subdivision -Salem, MA.
Planf` itle Date
L71Massachusetts 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
C. Submittal Requirements
DEP recommends that applicants submit this form, as well as, supporting documentation and plans, with
the Notice of Intent to provide stormwater management information for Commission review consistent
with the wetland regulations (310 CMR 10.05 (6)(b)) and DEP's Stormwater Management Policy(March
1997). If a particular stormwater management standard cannot be met, information should be provided to
demonstrate how equivalent water quality and water quantity protection will be provided. DEP encourages
engineers to use this form to certify that the project meets the stormwater management standards as well
as acceptable engineering standards. For more information, consult the Stormwater Management Policy.
D. Signatures ,�Si De
2
Applic t p
Si lure
Representative(if any) DaV
Signat
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16 1'.t� . '`�'��-
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PROJECT NARRATIVE
The site of the proposed Riverview Subdivision previously contained a 30,300 square
foot(approximate) building, which housed the Salem Shoe Manufacturing Company.
The site consists of 2.66 acres of land, more or less, and was virtually all dedicated to use
by the shoe factory. The parcel boundary has existed in its current configuration since
the early 1960's. The property is located within the riverfront associated with the North
River, but is separated by the river by the MBTA trackage running north from Salem.
The proposed subdivision would develop the site into twelve units of housing to be
located in six duplex buildings. The proposed lots would be served by an extension of
Saunders Street and the construction of a permanent cul-de-sac on Pearl Street. A total of
38,000 square feet of impervious surface would result, of which 12,300 square feet is
represented by the proposed buildings. Stormwater from new construction is to be
managed by a variety of on-site best management practices. Of the 38,000 square feet of
impervious surface, 28,200 square feet is located in the riverfront zone.
Professional Land Surveyors &Civil Engineers
ESSEX SURVEY SERVICE 1958- 1986
OSBORN PALMER 1911 - 1970
BRADFORD&WEED 1885- 1972
STORMWATER MANAGEMENT PLAN
RIVERVIEW • SALEM, MA.
.17
'N
®°da
`sy�a�a
104 LOWELL STREET
PEABODY, MASS. 01960
TELEPHONE: 978-531-8121 TELECOPIER: 978-531-5920 E-MAIL: elsai@prodigy.ne4.
STORM DRAINAGE FACILITIES
The site slopes generally westerly toward the MBTA rail line. No culverts were found
under the existing tracks. Based on the subsurface soil conditions, namely sand, it has
been determined that virtually all runoff generated on or tributary to the site is currently
infiltrating into the ground and is assumed to move below ground into the North River.
The proposed system of Stormwater Management Facilities serving the Riverview
Subdivision will rely on the existing infiltration characteristics of the site. Best
Management Practices are proposed as follows:
A. Roof runoff from individual homes will be directed into underground infiltration
galleries consisting of perforated pipes in a crushed stone bed.
B. Runoff from the extension of Saunders Street will be collected into a deep sump
catch basin at the westerly end of the proposed cul-de-sac. Outflow from that
basin will be directed into an infiltration pond located on Lot 2.
C. Runoff from the end of Pearl Street will be directed into a vegetated swale
paralleling the MBTA property.
Stormwater facilities for the extension of Saunders Street and proposed dwellings will
provide 80 percent total suspended solids removal from new stormwater flows. Runoff
from the end of Pearl Street will be directed into a new vegetated swale, thus improving
the existing condition. An Operation and Maintenance Plan is provided together with
calculations for design of the various stormwater management facilities.
Design of the stormwater facilities for the Riverview Subdivision has been accomplished
so as to replicate existing conditions for 2, 10 and 100 year storm events and prevent any
discharge of untreated stormwater.
PREDEVELOPMENT RUNOFF CALCULATIONS
TR55 Tc Worksheet
Page 1
Hydraflow Hydrographs by IntellsoNe
Hyd. No. 1
Storm frequency = yrs
Sheet Flow
Manning's n-value = 0.410
Flow length = 190.0 ft
Two-year 24-hr precip. = 3.20 in
Land slope = 6.2 %
Travel Time ........................................ = 23.3 min
Shallow Concentrated Flow
Flow length = 100 ft
Watercourse slope = 2.0 %
Surface description = Unpaved
Average velocity = 2.28 ft/s
Travel Time ........................................ = 0.7 min
Channel Flow
Cross section flow area = 0.0 sqft
Wetted perimeter = 0.0 ft
Channel slope = 0.0 %
Manning's n-value = 0.015
Velocity = 0.00 ft/s
Flow length = 0.0 ft
Travel Time ........................................ = min
Total Travel Time, Tc ........................ = 24.0 min
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 1
Hydrograph type = SCS Runoff Peak discharge = 3.47 cfs
Storm frequency = 100 yrs Time interval = 6 min
Drainage area = 3.70 ac Curve number = 50
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 24 min
Total precip. = 6.80 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=20,909 cuft
1 - SCS Runoff - 100 Yr - Qp = 3.47 cfs
4
i
3
Car 2
1
i
0
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs) .
/ Hyd. 1
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 1
Hydrograph type = SCS Runoff Peak discharge = 0.86 cfs
Storm frequency = 10 yrs Time interval = 6 min
Drainage area = 3.70 ac Curve number = 50
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 24 min
Total precip. = 4.60 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=7,206 tuft
1 - SCS Runoff - 10 Yr - Qp = 0.86 cfs
1 .0
i
0.8
,o 0.6
CY
0.4 j
I
j I
0.2
I
0.0 j
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
i
Time (hrs)
/ Hyd. 1
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 1
Hydrograph type = SCS Runoff Peak discharge = 0.06 cfs
Storm frequency = 2 yrs Time interval = 6 min
Drainage area = 3.70 ac Curve number = 50
Basin Slope = 0.0 % Hydraulic length = Oft
Tc method = TR55 Time of conc. (Tc) = 24 min
Total precip. = 3.10 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=1,464 cult
1 - SCS Runoff - 2 Yr - Qp = 0.06 cfs
0.0s
0.05
0.04
N
0.03
0.02
0.01
0.00
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0
Time (hrs)
/ Hyd. 1
POSTDEVELOPMENT RUNOFF CALCULATIONS
Hydrograph Plot
b H draflow H dro ra hs Intelisolve
Y Y 9 P Y
HY d. No. 2
BUILDING RUNOFF
Hydrograph type = SCS Runoff Peak discharge = 0.10 cfs
Storm frequency = 2 yrs Time interval = 6 min
Drainage area = 0.05 ac Curve number = 98
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = USER Time of conc. (Tc) = 10 min
Total precip. = 3.10 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=459 cult
2 - SCS Runoff - 2 Yr - Qp = 0.10 cfs
0.1
0.08
0.06
CJ
0.04
0.02
0.00
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 2
Hydrograph Plot
Hydratlow Hydrographs by Intelisolve
Hyd. No. 2
BUILDING RUNOFF
Hydrograph type = SCS Runoff Peak discharge = 0.14 cfs
Storm frequency = 10 yrs Time interval = 6 min
Drainage area = 0.05 ac Curve number = 98
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = USER Time of conc. (Tc) = 10 min
Total precip. = 4.60 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=698 cult
2 - SCS Runoff - 10Yr - Qp = 0.14ds
0.15
0.1
w
CY
0.05
0.00 1 L
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21 .6 24.0
Time (hrs)
/ Hyd. 2
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 2
BUILDING RUNOFF
Hydrograph type = SCS Runoff Peak discharge = 0.21 cfs
Storm frequency = 100 yrs Time interval = 6 min
Drainage area = 0.05 ac Curve number = 98
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = USER Time of conc. (Tc) = 10 min
Total precip. = 6.80 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=1,049 cult
2 - SCS Runoff - 100 Yr - Qp = 0.21 cfs
0.25
i
i
0.2
,w 0.15
� I
CY
0.1
i
0.05
i
0.00
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21 .6 24.0
Time (hrs)
/ Hyd. 2
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 3
Hydrograph type = Reservoir Peak discharge = 0.10 cfs
Storm frequency = 2 yrs Time interval = 6 min
Inflow hyd. No. = 2 Reservoir name = ROOF RECHARGES
Max. Elevation = 10.10 ft Max. Storage = 7 cuft
SWmge Indicabon method used. Hydrograph Volume=459 tuft
3 - Reservoir - 2 Yr - Qp = 0.10 cfs
0.1 1 77
0.08
0.06
a
0.04
0.02
0.00
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 2 / Hyd. 3
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 3
Hydrograph type = Reservoir Peak discharge = 0.10 cfs
Storm frequency = 10 yrs Time interval = 6 min
Inflow hyd. No. = 2 Reservoir name = ROOF RECHARGES
Max. Elevation = 10.10 ft Max. Storage = 38 cuft
Ste"indioean method used. Hydrograph Volume=698 tuft
3 - Reservoir - 10 Yr - Qp = 0.10 cfs
0.15
0.1
a
0.05
0.00
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
eA Hyd. 2 / Hyd. 3
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 3
Hydrograph type = Reservoir Peak discharge = 0.10 cfs
Storm frequency = 100 rs =
q Y Y Time Interval 6 min
Inflow hyd. No. = 2 Reservoir name = ROOF RECHARGES
Max. Elevation = 10.10 ft Max. Storage = 129 cuft
smmge indicaden method used. Hydrograph Volume=1,050 cult
3 - Reservoir - 100 Yr - Qp = 0.10 cfs
0.25
0.2
0.15
CY
0.1
0.05
0.00
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
® Hyd. 2 / Hyd. 3
TR55 Tc Worksheet
Page 1
Hydraflow Hydrographs by Intelisolve
Hyd. No. 4
Storm frequency = yrs
Sheet Flow
Manning's n-value = 0.410
Flow length = 190.0 ft
Two-year 24-hr precip. = 3.20 in
Land slope = 6.5 %
Travel Time ........................................ = 22.8 min
Shallow Concentrated Flow
Flow length = 65 ft
Watercourse slope = 2.0 %
Surface description = Unpaved
Average velocity = 2.28 ft/s
TravelTime ........................................ = 0.5 min
Channel Flow
Cross section flow area = 0.0 sgft
Wetted perimeter = 0.0 ft
Channel slope = 0.0 %
Manning's n-value = 0.015
Velocity = 0.00 ft/s
Flow length = 0.0 ft
TravelTime ........................................ = min
Total Travel Time, Tc ........................ = 23.3 min
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 4
TO RECHARGE POND LOT 2
Hydrograph type = SCS Runoff Peak discharge = 0.37 cfs
Storm frequency = 2 yrs Time interval = 6 min
Drainage area = 1.55 ac Curve number = 62
Basin Slope = 0.0 % Hydraulic length = oft
Tc method = TR55 Time of conc. (Tc) = 23.3 min
Total precip. = 3.20 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrogmph Volume=2,706 cuft
4 - SCS Runoff - 2 Yr - Qp = 0.37 cfs
0.4
0.3
N
O 0.2
0.1
I
I
0.0
L�-- .4 11
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 4
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 4
TO RECHARGE POND LOT 2
Hydrograph type = SCS Runoff Peak discharge = 1.16 cfs
Storm frequency = 10 yrs Time interval = 6 min
Drainage area = 1.55 ac Curve number = 62
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of cony (Tc) = 23.3 min
Total precip. = 4.60 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=6,741 cult
4 - SCS Runoff - 10 Yr - Qp = 1 .16 cfs
1.5
I
1 .0
w
I v
i CY
0.5
I
0.0
1 0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
Hyd. 4
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 4
TO RECHARGE POND LOT 2
Hydrograph type = SCS Runoff Peak discharge = 2.79 cfs
Storm frequency = 100 yrs Time interval = 6 min
Drainage area = 1.55 ac Curve number = 62
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 23.3 min
Total precip. = 6.80 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=14,938 cult
4 - SCS Runoff - 100 Yr - Qp = 2.79 cfs
3.0
2.5 ;.
i
2.
CY 1.5
i
1.
0.5
0.0
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 4
Hydrograph Plot
Hydraflow Hydrographs by Intellsolve
Hyd. No. 5
Hydrograph type = Reservoir Peak discharge = 0.22 cfs
Storm frequency = 2 yrs Time interval = 6 min
Inflow hyd. No. = 4 Reservoir name = PROP. INFILTRAT
Max. Elevation = 9.13 ft Max. Storage = 449 cuft
storage Indiadon method used. Hydrograph Volume=2,704 cult
5 - Reservoir - 2 Yr - Qp = 0.22 cfs
0.4
i
0.3
N I
0.2
CY
0.1
0.0 I I III
0.0 2.6 5.2 7.8 10.4 13.0 15.6 18.2 20.8 23.4 26.0 I
Time (hrs)
® Hyd. 4 / Hyd. 5
Hydrograph Plot
Hydraflow Hydrographs by IMelisolve
Hyd. No. 5
Hydrograph type = Reservoir Peak discharge = 0.68 cfs
Storm frequency = 10 yrs Time interval = 6 min
Inflow hyd. No. = 4 Reservoir name = PROP. INFILTRAT
Max. Elevation = 9.41 ft Max. Storage = 1,405 cuft
Stomp Indication meftd used. Hydrograph Volume=6,739 cuft
5 - Reservoir - 10 Yr - Qp = 0.68 cfs
1 .5
1.0
w
a
0.5
0.0
0.0 2.6 5.2 7.8 10.4 13.0 15.6 18.2 20.8 23.4 26.0
Time (hrs)
® Hyd. 4 / Hyd. 5
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 5
Hydrograph type = Reservoir Peak discharge = 1.64 cfs
Storm frequency = 100 yrs Time interval = 6 min
Inflow hyd. No. = 4 Reservoir name = PROP. INFILTRAT
Max. Elevation = 10.01 ft Max. Storage = 3,428 cuft
SWmge Inaicanon method used. Hydrograph Volume=14,936 cuft
5 - Reservoir - 100 Yr - Qp = 1.64 cfs
3.0
2.5
2.0
CY 1.5
1.0
0.5
0.0
Ll -
0.0 2.6 5.2 7.8 10.4 13.0 15.6 18.2 20.8 23.4 26.0
Time (hrs)
® Hyd. 4 / Hyd. 5
Reservoir Report Page t
Reservoir No. 2 - PROP. INFILTRATION POND Hydraflow Hydrographs by Intelisolve
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage/Storage Table
Stage(ft) Elevation(ft) -Contour area(sgft) Incr.Storage(cult) Total storage(cult)
0.00 - 9.00 3,250 0 - 0
1.00 10.00 3,550 3,400 3,400
3.00 12.00 4,150 7,700 11,100
Culvert/Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] ICI [D]
Rise in = 0.0 0.0 0.0 0.0 Crest Len It = 0.00 0.00 0.00 0.00
Span in = 0.0 0.0 0.0 0.0 Crest El.It = 0.00 0.00 0.00 0.00
No.Barrels = 0 0 0 0 Weir Coeff. = 0.00 0.00 0.00 0.00
Invert El.ft = 0.00 0.00 0.00 0.00 Weir Type = - - - -
Length ft = 0.0 0.0 0.0 0.0 Multi-Stage = No No No No
Slope% = 0.00 0.00 0.00 0.00
N-Value = .000 .000 .000 .000
Orif.Coeff. = 0.00 0.00 0.00 0.00
Multistage = n/a No No No EAltration Rate = 20.00 in/hr/sqft Tailwater Elev.= 0.00 ft
Note:All ou"lo ys have been analyzed under inlet and outlet wntrol.
Stage Storage/Discharge Table
Stage Storage Elevation Clv A Civ B Civ C Civ D Wr A Wr B Wr C Wr D EAl Total
ft cult I t ds cfs cis ds cfs ds ds cfs ds cfs
0.00 0 9.00 - - - - - - - - 0.000 0.00
1.00 - 3,400 10.00 - - - - - - - - 1.644 1.64
3.00 11,100 12.00 - - - - - - - - 1.921 1.92
PROP. INFILTRATION POND
3.
i
2.5
1 .5
1 .0
j
0.5
0.0
0.0 1291 .3 2582.5 3873.8 5165.0 6456.3 7747.5 9038.8 10330.0
Storage (cuft)
PROP. INFILTRATION POND
3.0
2 5 ( ® Total
Cult' A
2.0 Culv B
Cult' C
1 .5 ® Culv D
1 .0 Weir A
Weir B
0.5
/ Weir C
/ Weir D
0.0
0.0 0.2 015 0.7 0.9 1 .2 1 .4 1 .7 1 .9
Exfiltration
Discharge (cfs)
TR55 Tc Worksheet Pagel
Hydraflow Hydrographs by Intelisolve
Hyd. No. 6
Storm frequency = yrs
Sheet Flow
Manning's n-value = 0.400
Flow length = 80.0 ft
Two-year 24-hr precip. = 3.10 in
Land slope = 2.0 %
Travel Time ........................................ = 18.3 min
Shallow Concentrated Flow
Flow length = 0 ft
Watercourse slope = 0.0 %
Surface description = Paved
Average velocity = 0.00 ft/s
Travel Time ........................................ = 0.0 min
Channel Flow
Cross section flow area = 0.0 sqft
Wetted perimeter = 0.0 ft
Channel slope = 0.0 %
Manning's n-value = 0.015
Velocity = 0.00 ft/s
Flow length = 0.0 ft
TravelTime ........................................ = min
Total Travel Time, Tc ........................ = 18.3 min
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 6
TO VEG. SWAL E OFF PEARL ST.
Hydrograph type = SCS Runoff Peak discharge = 0.35 cfs
Storm frequency = 2 yrs Time interval = 6 min
Drainage area = 0.70 ac Curve number = 68
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 18.3 min
Total precip. = 3.20 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=1,745 cult
6 - SCS Runoff - 2 Yr - Qp = 0.36 cfs
0.4
0.3
CY 0.2
0.1
0.0
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 6
Hydrograph Plot
Hydraflow Hydrographs by lmelisolve
HY d. No. 6
TO VEG. SWAL E OFF PEARL ST.
Hydrograph type = SCS Runoff Peak discharge = 0.86 cfs
Storm frequency = 10 yrs Time interval = 6 min
Drainage area = 0.70 ac Curve number = 68
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 18.3 min
Total precip. = 4.60 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=3,812 cult
6 - SCS Runoff - 10 Yr - Qp = 0.86 cfs
1.0
i
i
0.8 i
0.6
a
0.4
0.2
0.0 �
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 .24.0
Time (hrs)
/ Hyd. 6
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 6
TO VEG. SWAL E OFF PEARL ST.
Hydrograph type = SCS Runoff Peak discharge = 1.81 cfs
Storm frequency = 100 yrs Time interval = 6 min
Drainage area 0.70 ac Curve number = 68
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 18.3 min
Total precip. = 6.80 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=7,740 cult
6 - SCS Runoff - 100 Yr - Qp = 1.81 cfs
2.0
1 .5
N
CY 1 .0
0.5
0.0
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21 .6 24.0
Time (hrs)
/ Hyd. 6
TR55 Tc Worksheet Paget
Hydraflow Hydrographs by Intelisolve
Hyd. No. 7
Storm frequency = yrs
Sheet Flow
Manning's n-value = 0.400
Flow length = 160.0 ft
Two-year 24-hr precip. = 3.10 in
Land slope = 1.5 %
Travel Time ........................................ = 35.7 min
Shallow Concentrated Flow
Flow length = 0 ft
Watercourse slope = 0.0 %
Surface description = Paved
Average velocity = 0.00 ft/s
Travel Time ........................................ = 0.0 min
Channel Flow
Cross section flow area = 0.0 sqft
Wetted perimeter = 0.0 ft
Channel slope = 0.0 %
Manning's n-value = 0.015
Velocity = 0.00 ft/s
Flow length = 0.0 ft
TravelTime ........................................ = min
Total Travel Time, Tc ........................ = 35.7 min
Hydrograph Plot
Hydrafiow Hydrographs by Intelisolve
Hyd. No. 7
CENTER OF LOTS 4-6
Hydrograph type = SCS Runoff Peak discharge = 0.08 cfs
Storm frequency = 2 yrs Time interval = 6 min
Drainage area = 1.17 ac Curve number = 55
Basin Slope = 0.0 % Hydraulic length = oft
Tc method = TR55 Time of conc. (Tc) = 35.7 min
Total precip. = 3.20 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=1,099 cuft
7 - SCS Runoff - 2Yr - Qp = 0.08cfs
0.1
0.08
0.06
CY
0.04
0.02
0.00
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0
Time (hrs)
/ Hyd. 7
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 7
CENTER OF LOTS 4-6
Hydrograph type = SCS Runoff Peak discharge = 1.32 cfs
Storm frequency = 100 yrs Time interval = 6 min
Drainage area = 1.17 ac Curve number = 55
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 35.7 min
Total precip. = 6.80 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=8,751 cult
7 - SCS Runoff - 100 Yr - Qp = 1.32 cfs
1 .5
1.0
� I
a
0.5
0.0
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0
Time (hrs)
/ Hyd. 7
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 7
CENTER OF LOTS 4-6
Hydrograph type = SCS Runoff Peak discharge = 1.32 cfs
Storm frequency = 100 yrs Time interval = 6 min
Drainage area = 1.17 ac Curve number = 55
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 35.7 min
Total precip. = 6.80 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=8,751 cult
7 - SCS Runoff - 100 Yr - Qp = 1.32 ds
1.5
I
i
I
1.0
N
w
t�
a
0.5
--T i
0.0
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0
Time (hrs)
/ Hyd. 7
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 7
CENTER OF LOTS 4-6
Hydrograph type = SCS Runoff Peak discharge = 0.43 cfs
Storm frequency = 10 yrs Time interval = 6 min
Drainage area = 1.17 ac Curve number = 55
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 35.7 min
Total precip. = 4.60 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=3,452 cult
7 - SCS Runoff - 10 Yr - Qp = 0.43 cfs
0.5
I
� 0.4
i
,fin 0.3
CY
j 0.2
0.1
I
0.0
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0
i
Time (hrs)
I
/ Hyd. 7
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 1
HOUSE RUNOFF MODEL
Hydrograph type = SCS Runoff Peak discharge = 0.12 cfs
Storm frequency = 2 yrs Time interval = 2 min
Drainage area = 0.05 ac Curve number = 98
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = USER Time of conc. (Tc) = 10 min
Total precip. = 3.10 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=505 cuft
1 - SCS Runoff - 2 Yr - Qp = 0.12 cfs
0.1
I
0.1
C'I
0.05
0.00 am I
Ll 111i
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 1
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 1
HOUSE RUNOFF MODEL
Hydrograph type = SCS Runoff Peak discharge = 0.18 cfs
Storm frequency = 10 yrs Time interval = 2 min
Drainage area = 0.05 ac Curve number = 98
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = USER Time of conc. (Tc) = 10 min
Total precip. = 4.60 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=768 cult
1 - SCS Runoff - 10 Yr - Qp = 0.18 cfs
0.2
0.15
0.1
0.0
i
0.00
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 1
Hydrograph Plot
Hydraflow Hydrographs by IntelisoNe
Hyd. No. 1
HOUSE RUNOFF MODEL
Hydrograph type = SCS Runoff Peak discharge = 0.27 cfs
Storm frequency = 100 yrs Time interval = 2 min
Drainage area = 0.05 ac Curve number = 98
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = USER Time of conc. (Tc) = 10 min
Total precip. = 7.00 in Distribution = Type III
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume=1,190 cult
1 - SCS Runoff - 100 Yr - Qp = 0.27 cfs
i
0.3
I
0.2
� 0.2
J
0.1
CY
0.10--
0.05-L
i
0.00
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 1
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 4
Hydrograph type = Reservoir Peak discharge = 0.09 cfs
Storm frequency = 2 yrs Time interval = 2 min
Inflow hyd. No. = 1 Reservoir name = RECHARGE TRENCH
Max. Elevation = 0.10 ft Max. Storage = 17 cuft
Storage Indication method used. Hydrograph Volume=504 tuft
4 - Reservoir - 2 Yr - Qp = 0.09 cfs
0.1
T-
O.1G-
0.05-
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 1 / Hyd. 4
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 4
Hydrograph type = Reservoir Peak discharge = 0.09 cfs
Storm frequency = 10 yrs Time interval = 2 min
Inflow hyd. No. = 1 Reservoir name = RECHARGE TRENCH
Max. Elevation = 0.10 ft Max. Storage = 70 cuft
storage indication method used. Hydrograph Volume=768 cult
4 - Reservoir - 10 Yr - Qp = 0.09 cfs
0.2
0.15
r�
CY 0.1
0.0
0.00
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 1 / Hyd. 4
SOILS DATA
I�
EASTERN LAND SURVEY ASSOCIATES, INC. JOe�`.f�nv�E
Christopher R. Mello PLS SHEET NO. OF 1
104 Lowell Street
PEABODY, MA 01960 CALCULATED BY- DATE
(978) 531-8121 CHECKED B[ DATE
SCALE
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EASTERN LAND SURVEY ASSOCIATES, INC. JOB �2,uERv%s. - Soar
Christopher R. Mello PLS SHEET NO. OF
104 Lowell Street
PEABODY, MA 01960 CALCULATED BY- k.53VNA DATE
(978) 531-8121 CHECKED DATE
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PPOOUCf�ql l� Ie SAeels 20Ai�ELNI
STORMWATER OPERATIONS AND MAINTENANCE PLAN
STORMWATER MANAGEMENT TIES
OPERATION AND MAINTENANCE PLAN
RIVERVIEW SUBDIVISION
SALEM, MASSACHUSETTS
A. Deep Sump Catch Basins
Catch basins shall be cleaned a minimum of two times per year and inspected
monthly. Catch basins shall be protected with stone filters and/or haybales
through the construction phase.
All sediments and hydrocarbons should be properly handled in disposed in
accordance with local, state and federal guidelines and regulations.
B. Vegetated Swale
The vegetated swale shall be inspected once monthly during the construction
phase and following major storms. In the long term, the swale shall be inspected
semi-annually. Repairs and reseeding should be done as required. Swales should
be mowed at least once per year. Grass clippings should be removed.
The grass must not be cut too often or shorter than four inches, in order to
maintain the effectiveness of the swale. Sediment and debris should be removed
manually, at least once per year, before the vegetation is adversely impacted.
Care should be taken to protect water quality swales from snow removal and
disposal practices and off street parking.
C. Infiltration Basins
1. During Construction
a. Before the development site is graded, areas of the infiltration
basins should be roped off to prevent heavy equipment from
compacting the underlying soils.
b. Infiltration basins shall not be used as a temporary sediment traps
during construction.
C. Infiltration Basins
1. During Construction Cont-
C. Infiltration basins shall not be constructed until the entire
contributing drainage area has been stabilized or silt fence
constructed between the basin and upstream areas.
d. During and after excavation, all excavated materials should be
placed away from the infiltration basins to prevent redeposition
during runoff events. All excavated materials should be properly
handled and disposed, during and after construction.
e. Light earth-moving equipment should be used to excavate the
infiltration basin. The basin floor should be deeply tilled with a
rotary tiller or a disc harrow to restore infiltration rates, after final
grading.
2. Long Term
a. Infiltration basins should be inspected after every major storm for
the first few months after construction to ensure proper
stabilization and function. Thereafter, the basins should be
inspected at least twice a year.
b. Pretreatment BMP's (deep sump catch basins and vegetated
swales) should be inspected and the accumulated sediment and
other debris removed in accordance with the recommended
maintenance schedule.
C. The grass in the basins and on the sideslopes should be mowed,
and grass clippings, organic matter, and accumulated trash and
debris removed, at least twice during the growing season.
d. Eroded or barren spots should be reseeded immediately after
inspection to prevent additional erosion and accumulation of
sediment.
e. Deep tilling can be used to break up a clogged surface area. Any
tilled areas should be revegetated immediately.
f. Sediment should be removed from the basins as necessary.
Removal procedures should not take place until the floor of the
basin is thoroughly dry.
D. Recharge Trenches for Proposed Dwellings
1. During Construction
a. Area of proposed recharge trenches shall be covered with
geotextile fabric and roped off or otherwise protected throughout
construction of the house.
2. Long Term
a. Recharge trenches should be inspected following any storm event
of more than one inch of rainfall in 24 hours. Any long-term
surface ponding will be indicative of trench failure and required
replacement. Trench surfaces shall be kept free of grass clippings,
leaves, litter or debris.
The party responsible for Operation and Maintenance of the Stormwater Management
Facilities is:
George Fallon
208 Derby Street
Salem, MA. 01970
Tel: (978)-745-2004
or his heirs and assigns.