HomeMy WebLinkAboutC502 - SWPPP DETAILSSILT FENCE:
THIS SEDIMENT BARRIER UTILIZES STANDARD STRENGTH OR EXTRA STRENGTH SYNTHETIC
FILTER FABRICS. IT IS DESIGNED FOR SITUATIONS IN WHICH ONLY SHEET OR OVERLAND
FLOWS ARE EXPECTED. MATERIAL PROPERTIES ARE LISTED IN THE PROVIDED TABLE.
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1. THE HEIGHT OF A SILT FENCE SHALL NOT EXCEED 36-INCHES (HIGHER FENCES MAY IMPOUND
VOLUMES OF WATER SUFFICIENT TO CAUSE FAILURE OF THE STRUCTURE).
2. THE FILTER FABRIC SHALL BE PURCHASED IN A CONTINUOUS ROLL CUT TO THE LENGTH OF THE
BARRIER TO AVOID THE USE OF JOINTS. WHEN JOINTS ARE NECESSARY, FILTER CLOTH SHALL BE
SPLICED TOGETHER ONLY AT A SUPPORT POST, WITH A MINIMUM OF A 6 INCH OVERLAP, AND
SECURELY SEALED.
3. POSTS SHALL BE SPACED A MAXIMUM OF 10 FEET APART AT THE BARRIER LOCATION AND
DRIVEN SECURELY INTO THE GROUND (MINIMUM OF 12-INCHES). WOOD POSTS WILL BE A
MINIMUM OF 32" LONG WHEN EXTRA STRENGTH FABRIC IS USED WITHOUT THE WIRE SUPPORT
FENCE, POST SPACING SHALL NOT EXCEED 6 FEET. A TRENCH SHALL BE EXCAVATED
APPROXIMATELY 4-INCHES WIDE AND 6-INCHES DEEP LONG THE LINE OF POSTS AND UPSLOPE
FROM THE BARRIER.
4. WHEN STANDARD STRENGTH FILTER FABRIC IS USED, A WIRE MESH SUPPORT FENCE SHALL BE
FASTENED SECURELY TO THE UPSLOPE SIDE OF THE POSTS USING HEAVY DUN WIRE STAPLES
AT LEAST 1-INCH LONG, TIE WIRES OR HOG RINGS. THE WIRE SHALL EXTEND INTO THE TRENCH
A MINIMUM OF 2-INCHES AND SHALL NOT EXTEND MORE THAN 36-INCHES ABOVE THE ORIGINAL
GROUND SURFACE.
5. THE STANDARD STRENGTH FILTER FABRIC SHALL BE STAPLED OR WIRED TO THE FENCE, AND
8-INCHES OF THE FABRIC SHALL BE EXTENDED INTO THE TRENCH. THE FABRIC SHALL NOT
EXTEND MORE THAN 36-INCHES ABOVE THE ORIGINAL GROUND SURFACE. FILTER FABRIC SHALL
NOT BE STAPLED TO EXISTING TREES.
6. WHEN EXTRA STRENGTH FILTER FABRIC AND CLOSER POST SPACING ARE USED, THE WIRE MESH
SUPPORT FENCE MAY BE ELIMINATED. IN SUCH A CASE, THE FILTER FABRIC IS STAPLED OR
WIRED DIRECTLY TO THE POSTS WITH ALL OTHER PROVISIONS OF ITEM NO. 6 APPLYING.
7. THE TRENCH SHALL BE BACKFILLED AND SOIL COMPACTED OVER THE FILTER FABRIC.
B. SILT FENCES SHALL BE REMOVED WHEN THEY HAVE SERVED THEIR USEFUL PURPOSE, BUT NOT
BEFORE THE UPSLOPE AREA HAS BEEN PERMANENTLY STABILIZED.
9. TO PREVENT WATER PONDED BY THE SILT FENCE FROM FLOWING AROUND THE ENDS, EACH END
SHALL BE CONSTRUCTED UPSLOPE SO THAT THE ENDS ARE AT A HIGHER ELEVATION.
BIORETENTION NOTES:
1. ALL DRAINAGE AREAS TO A BIORETENTION FACILITY ARE TO BE STABILIZED
PRIOR TO INSTALLATION OF AMENDED SOILS, MULCH OR PLANTINGS
2. INSTALL WIRE SCREENING AROUND ALL OUTLET OPENINGS TO PREVENT
LOSS OF MULCH
3. UNDERDRAIN PIPE SHOULD HAVE 3/8" PERFORATIONS SPACED AT 6"
CENTERS, MIN. 4 HOLES PER ROW. MAXIMUM SPACING OF UNDERDRAIN
PIPE IS 10 FEET ON CENTER, UNDERDRAIN MINIMUM GRADE = 1.0%.
4. UNDERDRAIN CLEANOUTS SHOULD EXTEND A MIN. OF 6" ABOVE TOP
SURFACE OF MULCH LAYER. CLEANOUTS MAY BE FLUSH WITH TOP OF
SURFACE TO ALLOW DRAWDOWN
5. SCARIFY EXISTING SOILS PRIOR TO INSTALLING PERMEABLE SOIL MIX &
UNDERDRAIN.
BIORETENTION PLANTING SOIL MIX
PLANTING SOIL SHALL CONSIST OF A COMBINATION OF SAND, TOPSOIL, AND
COMPOST WITH THE FOLLOWING COMPOSITION:
4 PARTS SAND
2 PARTS TOPSOIL
2 PARTS COMPOST
PH RANGE: 5.2-7.0
INFILTRATION RATE NO LESS THAN 0.5 IN/HR
SOLUBLE SALTS: 500 PPM MAXIMUM
ORGANIC MATTER: 1.5-3% BY WEIGHT
PHOSPHORUS: BETWEEN 15 AND 60 MG/KG (PPM) AS DETERMINED BY THE
MEHLICH III TEST
SOIL SHALL BE CERTIFIED BY PROFESSIONAL SOIL SCIENTIST UPON DELIVERY
FOR INSPECTION.
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RAIN GARDEN PROTECTION SIGN
NOT TO SCALE
RELEASED FOR CONSTRUCTION
Subject to compliance with all regulation;
of State and Local Codes
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DATE: 07/22/19
'THE USE OF STRAW WATTLES HAS PROVEN TO
BE A VERSATILE AND EFFECTIVE ESC BMP
ESPECIALLY IN RESIDENTIAL SETTINGS. STRAW
WATTLES MAY BE SUBSTITUTED FOR SILT FENCE
IN LINEAR INSTALLATIONS.
SEDIMENT FENCE BARRIER DETAIL
NOT TO SCALE
SEDIMENT FENCE FABRIC SHALL BE PER INDOT STANDARDS SPECIFICATIONS FOR
GEOTEXTILE FABRIC OR THE EQUIVALENT TO THE FOLLOWING PROPERTIES:
MATERIAL PROPERTIES
STAPLES
MAXIMUM TENSILE STRENGTH 120 Its;
(2 PER BALE)
MAXIMUM ELONGATION AT 60 LBS. 50%
MINIMUM PUNCTURE STRENGTH 50 Ibs
MINIMUM TEAR STRENGTH 40 Ibs
BINDER WIRE-/
MINIMUM BURST STRENGTH 200 psi
APPARENT OPENING SIZE 0.84 mm
WOOD OR
MINIMUM PERMITTIVITY T2x 101 sec
METAL STAKES
ULTRAVIOLET EXPOSURE STRENGTH RETENTION 70%
(2 PER BALE)
MAINTENANCE:
SILT FENCES AND FILTER BARRIERS SHALL BE INSPECTED IMMEDIATELY AFTER
EACH RAINFALL AND AT LEAST DAILY DURING PROLONGED RAINFALL. ANY
REQUIRED REPAIRS SHALL BE MADE IMMEDIATELY.
SHOULD THE FABRIC ON A SILT FENCE OR FILTER BARRIER DECOMPOSE OR
BECOME INEFFECTIVE PRIOR TO THE END OF THE EXPECTED USABLE LIFE AND
THE BARRIER IS STILL NECESSARY, THE FABRIC SHALL BE REPLACED
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PROMPTLY.
SEDIMENT DEPOSITS SHOULD BE REMOVED AFTER EACH STORM EVENT. THEY
MUST BE REMOVED WHEN DEPOSITS REACH APPROXIMATELY ONE-HALF THE
HEIGHT OF THE BARRIER.
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ANY SEDIMENT DEPOSITS REMAINING IN PLACE AFTER THE SILT FENCE OR
FILTER BARRIER IS NO LONGER REQUIRED SHALL BE DRESSED TO CONFORM
WITH THE EXISTING GRADE, PREPARED AND SEEDED.
CONSTRUCTION SPECIFICATIONS
1. STONE SIZE - USE 2" STONE, OR RECLAIMED OR RECYCLED CONCRETE EQUIVALENT.
2. LENGTH - AS REQUIRED.
3. THICKNESS - NOT LESS THAN SIX (6) INCHES.
4. WIDTH - TWENTY (20) FOOT MINIMUM, BUT NOT LESS THAN THE FULL WIDTH AT POINTS
WHERE INGRESS OR EGRESS OCCURS.
5. FILTER CLOTH - WILL BE PLACED OVER THE ENTIRE AREA PRIOR TO PLACING OF STONE.
6. SURFACE WATER - ALL SURFACE WATER FLOWING OR DIVERTED TOWARD CONSTRUCTION
ENTRANCES SHALL BE PIPED ACROSS THE ENTRANCE. IF PIPING 15 IMPRACTICAL, A
MOUNTABLE BERM WITH 5:1 SLOPES WILL BE PERMITTED. COST OF PIPE SHALL BE INCLUDED
IN THE PRICE BID FOR THE STABILIZED CONSTRUCTION ENTRANCE.
7. MAINTENANCE - THE ENTRANCE SHALL BE MAINTAINED IN A CONDITION WHICH WILL PREVENT
TRACKING OR FLOWING OF SEDIMENT ONTO PUBLIC RIGHT-OF-WAY. THIS MAY REQUIRE
PERIODIC TOP DRESSING WITH ADDITIONAL STONE AS CONDITIONS DEMAND AND REPAIR
AND/OR CLEANOUT OF ANY MEASURES USED TO TRAP SEDIMENT. ALL SEDIMENT SPILLED,
DRO PED, WASHED OR TRACKED ONTO PUBLIC RIGHTS -OF -WAY MUST BE REMOVED
IMMEDIATELY.
8. WASHING - WHEELS SHALL BE CLEANED TO REMOVE SEDIMENT PRIOR TO ENTRANCE ONTO
PUBLIC RIGHT-OF-WAYS. WHEN WASHING IS REQUIRED, IT SHALL BE DONE ON AN AREA
STABILIZED WITH STONE AND WHICH DRAINS INTO AN APPROVED SEDIMENT TRAPPING DEVICE.
9. PERIODIC INSPECTION AND NEEDED MAINTENANCE SHALL BE PROVIDED AFTER EACH RAIN.
r MOUNTABLE BERM (OPTIONAL)
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1 T S.-I3� S� rEXISTING PAVEMENT
GROUND PROFILE
PLAN VIEW
STABILIZED CONSTRUCTION ENTRANCE
NOT TO SCALE
PLANTING LIMITS (CURB TO
STD MANHOLE
W/BEEHIVE INLET
TOP OF
3" MULCH
LAYER
EXISTING PAVEMENT
PONDING
DEPTH = 0.5'
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DANDY BAG GRATING
SECTION A -A
INSTALLATION:
STAND GRATE ON END. PLACE DANDY BAG OVER GRATE.
FLIP GRATE OVER $O THAT OPEN END IS UP. PULL UP
SLACK. TUCK FLAP IN. BE SURE END OF GRATE IS
COMPLETELY COVERED BY FLAP OR DANDY BAG WILL NOT
FIT PROPERLY. HOLDING HANDLES, CAREFULLY PLACE
DANDY BAG WITH GRATE INSERTED INTO CATCH BASIN
FRAME SO THAT RED DOT ON THE TOP OF THE DANDY
BAG IS VISIBLE.
MAINTENANCE:
AFTER SILT HAS DRIED, REMOVE IT FROM THE SURFACE
OF DANDY BAG WITH BROOM.
RAIN GARDEN
PROTECTION SIGN
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TOP OF SOIL
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SUBSURFACE DRAIN NON -WOVEN FILTER
SET BASIN ON FABRIC ON BOTTOM AND
UNDISTURBED SOIL SIDES OF SSD TRENCH
RAIN GARDEN TYPICAL CROSS SECTION
NOT TO SCALE
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1. ACTUAL LAYOUT TO BE DETERMINED IN THE FIELD.
2. A CONCRETE WASHOUT SIGN SHALL BE INSTALLED WITHIN 30' OF THE
TEMPORARY CONCRETE WASHOUT FACILITY.
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3. MATERIALS USED TO CONSTRUCT TEMPORARY CONCRETE WASHOUT FACILITIES
SHALL BE REMOVED FROM THE SITE OF THE WORK AND DISPOSED OF OR
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RECYCLED.
4. HOLES, DEPRESSIONS OR OTHER GROUND DISTURBANCE CAUSED BY THE
REMOVAL OF THE TEMPORARY CONCRETE WASHOUT FACILITIES SHALL BE
C502
RAIN GARDEN TYPICAL PLAN VIEW
BACKFILLED, REPAIRED, AND STABILIZED TO PREVENT EROSION.
NOT TO SCALE