ECON BLOC SITE RETAIN WALL 09/07/2018 Economy Block Site Retaining Wall
12 Nurse Way, Salem, MA
prepared
by:
Structures North Consulting Engineers,Inc.
Attn: Mr. Edward Moll, P.E.
60 Washington Street, Suite 401
Salem, MA 01971-8560
(978) 745-6817
for:
Bartlett Steadman Co., Inc
67 R Village Street
Marblehead, MA 01945
Construction Documents Index:
Outline Specifications 2 pages
Retaining Wall Key Plan SKS-1
Retaining Wall Sections SKS-2, SKS-3
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Edward H. Moll II,P.E.
MA Reg. No. 33718
Ecology Block Retaining Wall Structures North Consult.Engrs.
12 Nurse Way,Salem, MA 7 September 2018
Page 1 of 2
ECOLOGY BLOCK RETAINING WALL INSTALLATION GENERAL NOTES
1. CONTRACTOR SHALL EXCAVATE TO THE LINES AND GRADES SHOWN ON THE
CONSTRUCTION DRAWINGS. THE CONTRACTOR SHALL BE CAREFUL NOT TO
DISTURB THE BASE BEYOND THE LINES INDICATED. OVER-EXCAVATED
AREAS,SUCH AS FOR THE REMOVAL OF OBSTRUCTIONS, SHALL BE FILLED
WITH SUITABLE BASE OR BACKFILL MATERIAL AND COMPACTED TO 95
PERCENT STANDARD PROCTOR.
2. THIS RETAINING WALL IS A GEOGRID REINFORCED WALL, OR MSE,
MECHANICALLY STABILIZED EARTH WALL, UTILIZING LAYERS OF SOIL
REINFORCEMENT BETWEEN THE BLOCK AND THE SOIL MASS DIRECTLY
BEHIND THE WALL.
3. WALL DESIGN SURCHARGE IS 100 PSF. IN NO CASE SHOULD HEAVY
EQUIPMENT BE ALLOWED WITHIN 6'-0" OF THE WALLS. DESIGN IS BASED
ON NCMA DESIGN MANUAL FOR SEGMENTAL RETAINING WALLS, CURRENT
EDITION.
4. PROVIDE 6" LEVELING PAD DIRECTLY BENEATH THE BASE BLOCK AND
EXTENDING 6" BEYOND THE INSIDE AND OUTSIDE FACES. LEVELING PAD IS
TO CONSIST OF WELL-GRADED GRANULAR MATERIAL THAT ALLOWS FOR
DRAINAGE BUT HAS ENOUGH FINES TO ALLOW FOR PROPER COMPACTION.
SOME EXAMPLES OF LEVELING PAD MATERIAL(BY REGIONAL NAME)
INCLUDE: ROAD BASE, CLASS 5, 3/-INCH MINUS, AND CRUSH-AND-RUN.
BASE MATERIAL SHALL BE COMPACTED SO AS TO PROVIDE A SMOOTH,
HARD SURFACE ON WHICH TO PLACE THE FIRST COURSE OF UNITS.
5. THE SOIL MATERIAL BELOW THE LEVELING PAD IS TO BE CHECKED BY
QUALIFIED PERSONNEL TO CONFIRM CAPACITY TO SUPPORT THE MASS
CONCRETE BLOCK RETAINING WALLS.
6. A VERTICAL COLUMN OF DRAINAGE MATERIAL, SUCH AS%" CRUSHED
STONE, IS TO BE PROVIDED IMMEDIATELY BEHIND THE WALL, AND IS TO BE
SEPARATED FROM ADJACENT SOIL USING FILTER FABRIC.
7. USE ONLY THE GEOSYNTHETIC REINFORCEMENT(GEOGRID) TYPE
SPECIFIED. INSURE THAT THE REINFORCEMENT IS CUT TO THE PROPER
LENGTHS AS INDICATED ON THE FINAL ENGINEERED PLAN. GEOGRID IS UNI-
AXIAL (STRONGER IN ONE DIRECTION) AND MUST BE LAID WITH THE
MANUFACTURER'S EDGE PERPENDICULAR TO THE WALL FACE.
8. THE GEOGRID SHOULD BE LAID ON THE TOP OF THE 2" FROM THE FRONT
FACE AS POSSIBLE AND EXTEND BACK OVER A COMPACTED, LEVEL BACKFILL
Ecology Block Retaining Wall Structures North Consult, Engrs.
12 Nurse Way, Salem, MA 7 September 2018
Page 2 of 2
TO THE LENGTH REQUIRED. PLACE A GROUT BED ABOVE AND BELOW THE
GEOGRID AND SANDWICH THE REINFORCEMENT UNDER THE NEXT COURSE
OF BLOCKS TO ANCHOR IN PLACE.THE NEXT COURSE OF UNITS SHALL BE
PLACED SUCH THAT THE GEOGRID IS DEFORMED OVER THE TONGUE AND
GROOVE KEY.THEN PULL THE TAIL(LOOSE END) OF THE GRID TAUT TO
REMOVE SLACK OR WRINKLES.
9. STAKE THE TAIL OF THE GEOGRID PRIOR TO PLACING BACKFILL MATERIAL
TO MAINTAIN TENSION. WHEN PLACING BACKFILL OVER A LAYER OF
GEOGRID, START JUST BEHIND THE DRAINAGE AGGREGATE AND FILL
TOWARD THE TAIL OF THE GEOGRID. AVOID OPERATING BACKFILL
EQUIPMENT DIRECTLY ON THE TENSIONED GEOGRID AS MUCH AS
POSSIBLE.A MINIMUM OF 6-INCHES OF BACKFILL SHOULD BE PLACED OVER
THE GRID BEFORE DRIVING ANY EQUIPMENT ON TOP OF THE GRIDS. AVOID
SHARP TURNING AND SUDDEN BRAKING WITH ALL TYPES OF EQUIPMENT
TO AVOID DISPLACING, WRINKLING OR DAMAGING THE GEOGRID
REINFORCEMENT.
10. REINFORCED SOILS USED IN THE BACKFILL BY GRADATION SHALL HAVE NO
MORE THAN 3S PERCENT PASSING THE NUMBER 200 SIEVE. ALL
REINFORCED AND RETAINED SOIL BACKFILL MATERIALS SHALL BE
COMPACTED TO A MINIMUM 95%STANDARD PROCTOR DENSITY.
END OF INSTALLATION GENERAL NOTES
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