20191123 Ver 1_2019-08-09 - Grants Creek 4B EC7 plan sheet_20191002

Wanucha, Dave
From:Ward Marotti <[e-mail]>
Sent:Wednesday, October 2, 2019 9:23 AM
To:Wanucha, Dave
Subject:\[External\] RE: Grant's Creek Greenway Extension_401 Application
Attachments:2019-08-09 - Grants Creek 4B EC7 plan sheet.pdf
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Dave:
The swales are very shallow at 12 to 15 inches deep, maximum, and are expected to receive limited flow from runoff in
most cases. Limiting the slopes to 2:1 rather than 3:1 also limits the area of disturbance for certain swale locations along
the edge of the project limits.

Sheet EC7 is attached.

Ward Marotti
Senior Project Manager
WK Dickson & Co., Inc.
Mobile: [phone]

From: Wanucha, Dave <[e-mail]>
Sent: Tuesday, October 1, 2019 12:50 PM
To: Ward Marotti <[e-mail]>
Subject: Grant's Creek Greenway Extension_401 Application

Ward,
Just a couple of issues with the application that need to be resolved before I finalize your permit.
 Regarding stormwater, the grass-lined “V” swale on Sheet SD2 is shown as 2:1. 15A NCAC 02H .1003(2) requires
vegetated slopes no steeper than 3:1. Please provide some reasoning why you are building 2:1 slopes and how
you will ensure the banks (soil and veg) will remain stable.
 Plan sheet legends refer to details 3&4 on sheet EC7 (regarding pump arounds) but we did not receive plan
sheet EC7 and cannot review the details. Please provide a copy of EC7.

Thanks.

Dave W.

Dave Wanucha
Division of Water Resources
401 & Buffer Transportation Permitting
NC Department of Environmental Quality

336-776-9703 office
336-403-5655 mobile
[e-mail]

1

NC DEQ Winston Salem Regional Office
450 West Hanes Mill Road, Suite 300
Winston Salem, NC 27105

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

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INSTALLATION:
WHEN AND WHERE TO USE IT
WK
SILT FENCE IS APPLICABLE IN AREAS:
DDICKSON
1. REMOVE ALL VEGETATION AND ANY OBJECTIONABLE MATERIAL FROM THE
FOUNDATION AREA.
1.25 LB./LINEAR FT. STEEL POSTS
WHERE THE MAXIMUM SHEET OR OVERLAND FLOW PATH LENGTH TO THE FENCE IS 100-FEET.
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2. DIVERT ALL SURFACE RUNOFF AND DRAINAGE FROM STONES TO A SEDIMENT
WHERE THE MAXIMUM SLOPE STEEPNESS (NORMAL [PERPENDICULAR] TO FENCE LINE) IS 2HAV.
TRAP OR BASIN.
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EXTRA STRENGTH
THAT DO NOT RECEIVE CONCENTRATED FLOWS GREATER THAN 0.5 CFS.
COLONNADE DR
EDGES SHALL BE TAPERED
3. INSTALL A NON -WOVEN GEOTEXTILE FABRIC PRIOR TO PLACING ANY STONE.
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FILTER FABRIC I
CHARLOTTE,
RLOTTE, NC 28205
OUT TOWARDS ROAD TO
4. INSTALL A CULVERT PIPE ACROSS THE ENTRANCE WHEN NEEDED TO PROVIDE
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DO NOT PLACE SILT FENCE ACROSS CHANNELS OR USE IT AS A VELOCITY CONTROL BMP.
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PREVENT TRACKING OF MUD
ON THE EDGES
POSITIVE DRAINAGE.
5. CONTRACTOR SHALL CONSTRUCT "TIRE -SCRUBBER" AT ENTRANCE OF EACH
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CONSTRUCTION SPECIFICATIONS:
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CONSTRUCTION ROAD ENTRANCE TO STATE AND/OR CITY ROAD. NCDOT #5 OR
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#57 WASHED STONE SHALL BE USED. LOCATE "TIRE SCRUBBER" PADS ON BOTH
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1. USE A SYNTHETIC FILTER FABRIC OF AT LEAST 95% BY WEIGHT OF POLYOLEFINS OR POLYESTER,
NC LICENSE NO.F-0374
SIDES OF CONSTRUCTION ROADWAYS WHERE THAT CROSS STATE AND/OR CITY
DUTY PLASTIC
IS CERTIFIED BY THE MANUFACTURER OR SUPPLIER AS CONFORMING TO THE
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ROADS.
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FOR STEEL POSTS
REQUIREMENTS IN ASTM D 6461. SYNTHETIC FILTER FABRIC SHOULD CONTAIN ULTRAVIOLET RAY
6. THE ENTRANCE SHALL CONSIST OF 1-INCH TO 3-INCH D50 STONE PLACED AT A
BACKFILL TRENCH WITH \ \
INHIBITORS AND STABILIZERS TO PROVIDE A MINIMUM OF 6 MONTHS OF EXPECTED USABLE
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MINIMUM DEPTH OF 6-INCHES. MINIMUM DIMENSIONS OF THE ENTRANCE SHALL
COMPACTED EARTH
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CONSTRUCTION LIFE AT A TEMPERATURE RANGE OF 0° TO 120' F.
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BE 10-FEET WIDE BY 100-FEET LONG AND MAY BE MODIFIED AS NECESSARY TO
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2. ENSURE THAT POSTS FOR SEDIMENT FENCES ARE 1.33 LB/LINEAR FT STEEL WITH A MINIMUM
ACCOMMODATE SITE CONSTRAINTS
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LENGTH OF 5 FEET. MAKE SURE THAT STEEL POSTS HAVE PROJECTIONS TO FACILITATE
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7. THE EDGES OF THE ENTRANCE SHALL BE TAPERED OUT TOWARDS THE ROAD TO
PREVENT TRACKING OF MUD AT THE EDGE OF THE ENTRANCE.
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FASTENING THE FABRIC.
CULVERT PIPE; 6-INCH MIN. o 0 0
AS NEEDED
INSPECTION AND MAINTENANCE:
BURY FABRIC
USE EITHER FLAT -BOTTOM
CONSTRUCTION:
OR V-BOTTOM TRENCH
1. CONSTRUCT THE SEDIMENT BARRIER OF EXTRA STRENGTH SYNTHETIC FILTER FABRICS.
AVERAGE STONE DIAMETER
1. INSPECT ONCE EVERY FOURTEEN (14) CALENDAR DAYS AND WITHIN 24 HOURS
SHOWN BELOW SILT FENCE INSTALLATION
2. ENSURE THAT THE HEIGHT OF THE SEDIMENT FENCE DOES NOT EXCEED 24 INCHES ABOVE THE
2 TO 3-INCHES WITH A o
OF THE END OF A STORM EVENT OF 0.5 INCHES OR GREATER.
GROUND SURFACE. (HIGHER FENCES MAY IMPOUND VOLUMES OF WATER SUFFICIENT TO CAUSE
6- INCH MINIMUM DEPTH
6-
2. CHECK FOR MUD AND SEDIMENT BUILDUP AND PAD INTEGRITY.
FAILURE OF THE STRUCTURE.)
3. MAKE DAILY INSPECTIONS DURING PERIODS OF WET WEATHER. MAINTENANCE
3. CONSTRUCT THE FILTER FABRIC FROM A CONTINUOUS ROLL CUT TO THE LENGTH OF THE
PROFESSIONAL SEAL
UNDERLINING NON -WOVEN GEOTEXTILE FABRIC
IS REQUIRED MORE FREQUENTLY IN WET WEATHER CONDITIONS.
BARRIER TO AVOID JOINTS. WHEN JOINTS ARE NECESSARY, SECURELY FASTEN THE FILTER
4. RESHAPE THE STONE PAD AS NEEDED FOR DRAINAGE AND RUNOFF CONTROL.
FILTER FABRIC FILTER FABRIC
CLOTH ONLY AT A SUPPORT POST WITH 4 FEET MINIMUM OVERLAP TO THE NEXT POST.
5. WASH OR REPLACE STONES AS NEEDED AND AS DIRECTED BY THE INSPECTOR.
COMPACTED COMPACTED
4. EXTRA STRENGTH FILTER FABRIC WITH 6 FEET POST SPACING DOES NOT REQUIRE WIRE MESH
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THE STONE IN THE ENTRANCE SHOULD BE WASHED OR REPLACED WHENEVER
SUPPORT FENCE. SECURELY FASTEN THE FILTER FABRIC DIRECTLY TO POSTS. WIRE OR PLASTIC
THE ENTRANCE FAILS TO REDUCE MUD BEING CARRIED OFF -SITE BY VEHICLES.
EARTH 18" TO 24" EARTH 18" TO 24"
ZIP TIES SHOULD HAVE MINIMUM 50 POUND TENSILE STRENGTH.
NOTES:
FREQUENT WASHING WILL EXTEND THE USEFUL LIFE OF STONE.
RUNOFF RUNOFF
5. EXCAVATE A TRENCH APPROXIMATELY 4 INCHES WIDE AND 8 INCHES DEEP ALONG THE PROPOSED
6. CONTRACTOR SHALL MAINTAIN "TIRE SCRUBBERS" IN SUCH CONDITION THAT
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LINE OF POSTS AND UPSLOPE FROM THE BARRIER.
INSTALL A CULVERT PIPE ACROSS THE ENTRANCE WHEN NEEDED TO PROVIDE POSITIVE
TRUCKS ARE PREVENTED FROM TRACKING MUD ONTO STREETS. TOP DRESS
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6. PLACE 12 INCHES OF THE FABRIC ALONG THE BOTTOM AND SIDE OF THE TRENCH.
DRAINAGE.
"TIRE SCRUBBERS" PERIODICALLY AS NEEDED.
8"
24" MIN 24" MIN
7. BACKFILL THE TRENCH WITH SOIL PLACED OVER THE FILTER FABRIC AND COMPACT. THOROUGH
7. IMMEDIATELY REMOVE MUD AND SEDIMENT TRACKED OR WASHED ONTO PUBLIC
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COMPACTION OF THE BACKFILL IS CRITICAL TO SILT FENCE PERFORMANCE.
WHEN AND WHERE TO USE IT
ROADS BY BRUSHING OR SWEEPING.
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8. DO NOT ATTACH FILTER FABRIC TO EXISTING TREES.
8. FLUSHING SHOULD ONLY BE USED WHEN THE WATER CAN BE DISCHARGED TO A
STABILIZED CONSTRUCTION ENTRANCES SHOULD BE USED AT ALL POINTS WHERE
SEDIMENT TRAP OR BASIN.
FILTER
TRAFFIC WILL BE LEAVING A CONSTRUCTION SITE AND MOVING DIRECTLY ONTO A PUBLIC
9. REPAIR ANY BROKEN PAVEMENT IMMEDIATELY.
FABRIC 4„ FILTER FABRIC
MAINTENANCE:
ROAD.
FLAT -BOTTOM TRENCH DETAIL V-SHAPED TRENCH DETAIL
INSPECT SEDIMENT FENCES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL. MAKE ANY REQUIRED
REPAIRS IMMEDIATELY.
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SHOULD THE FABRIC OF A SEDIMENT FENCE COLLAPSE, TEAR, DECOMPOSE OR BECOME INEFFECTIVE,
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TEMPORARY
GRAVEL
REPLACE IT PROMPTLY.
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ENTRANCE
2 TEMPORARY SILT FENCE
REMOVE SEDIMENT DEPOSITS AS NECESSARY TO PROVIDE ADEQUATE STORAGE VOLUME FOR THE
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NEXT RAIN AND TO REDUCE PRESSURE ON THE FENCE. TAKE CARE TO AVOID UNDERMINING THE FENCE
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NOT TO SCALE
DURING CLEANOUT.
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REMOVE ALL FENCING MATERIALS AND UNSTABLE SEDIMENT DEPOSITS AND BRING THE AREA TO
GRADE AND STABILIZE IT AFTER THE CONTRIBUTING DRAINAGE AREA HAS BEEN PROPERLY STABILIZED.
NOTES:
FLOW
MIDDLE LAYER TOP LAYER
1. EXCAVATION SHALL BE PERFORMED ONLY IN DRY AND/OR
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BOTTOM LAYER
EARTH SURFACE
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ISOLATED SECTIONS OF CHANNEL. DE -WATERING
PUMP
WORK -
AREA
2. IMPERVIOUS DIKES SHOULD BE USED TO ISOLATE WORK AREAS
°
FROM STREAM FLOW (SEE DETAIL THIS SHEET).
IMPERVIOUS
TRENCH 0.25'
m
DIKE
B
ENDS OF BAGS IN DEEP ONLY
3. THE CONTRACTOR SHALL NOT DISTURB MORE AREA THAN CAN BE
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WHEN PLACED
STABILIZED IN ONE WORKING DAY. A MAXIMUM OF 200 FEET MAY BE
IMPERVIOUS DIKE
PLAN VIEW
ADJACENT ROWS BUTTED ON EARTH
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DISTURBED AT ANY ONE TIME.
SLIGHTLY TOGETHER
SURFACE
SEE NOTE
SECTION B-B
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4. THE CONTRACTOR SHALL BE RESPONSIBLE FOR DETERMINING
SEE NOTE
LOWEST POINT GROUND LEVEL
PUMP SIZE SUFFICIENT TO PUMP BASE FLOW.
DISCHARGE HOSE
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SANDBAG BARRIERS SHALL BE CONSTRUCTED OF THREE LAYERS OF SANDBAGS. THE BOTTOM LAYER
5. DIKE MUST BE CONSTRUCTED OF NON -ERODIBLE MATERIALS SUCH
STONECLASS
SHALL CONSIST OF 3 ROWS OF BAGS, THE MIDDLE LAYER SHALL CONSIST OF 2 ROWS OF BAGS AND THE
AS SANDBAGS.
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TOP LAYER SHALL CONSIST OF 1 ROW OF BAGS. THE RECOMMENDED DIMENSION OF A FILLED SANDBAG
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SEQUENCE OF CONSTRUCTION FOR TYPICAL PUMP AROUND SILT BAG
KEPT OUTSIDE OF WORK
AREA
EARTH SURFACE
SHALL BE APPROXIMATELY 0.5 FT X 0.5 FT X 1.5 FT.
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LOCATION
SECTION A -A
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1. INSTALL STILLING BASIN AND STABILIZED OUTFALL USING CLASS A
RIP RAP AT THE DOWNSTREAM END OF THE DESIGNATED PROJECT
SANDBAG IMPERVIOUS DIKE
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WORKING AREA. STABILIZED OUTFALL
NOTE: END OF DIKE AT GROUND LEVEL TO BE HIGHER THAN THE LOWEST POINT OF
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CLASS A STONE FILTER FABRIC
FLOW CHECK. SUFFICIENT SANDBAGS ARE TO BE PLACED TO PREVENT SCOURING.
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1.2.
THE CONTRACTOR SHALL INSTALL THE PUMP AROUND PUMP AND
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THE TEMPORARY PIPING THAT WILL CONVEY THE BASE FLOW FROM
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UPSTREAM OF THE WORK AREA TO THE STABILIZED OUTFALL.
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3. INSTALL UPSTREAM IMPERVIOUS DIKE AND BEGIN PUMPING
GROUND
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OPERATIONS FOR STREAM DIVERSION.
STABILIZED
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OUTFALL CLASS 15' TO 20'
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4. INSTALL THE DOWNSTREAM IMPERVIOUS DIKE AND DEWATERING
A STONE
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PUMPING APPARATUS IF NEEDED TO DEWATER THE ENTRAPPED
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AREA. THE PUMP AND HOSE FOR THIS PURPOSE SHALL BE OF
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SUFFICIENT SIZE TO DEWATER THE WORK AREA. THIS WATER WILL
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ALSO BE PUMPED TO AN OUTFACE STABILIZED WITH CLASS A RIP
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1. RIPRAP SHOULD EXTEND UP BOTH SIDES OF THE APRON AND AROUND THE END OF THE
D
PIPE OR CULVERT AT THE DISCHARGE OUTLET AT A MAXIMUM SLOPE OF 2:1 AND A
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RAP.
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END OF PIPE -
HEIGHT NOT LESS THAN TWO THIRDS THE PIPE DIAMETER OR CULVERT HEIGHT.
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FILTER FABRIC
8" OF CLASS A
2. THERE SHALL BE NO OVERFLOW FROM THE END OF THE APRON TO THE SURFACE OF
5. THE CONTRACTOR SHALL EXCAVATE ANY ACCUMULATED SILT AND
STONE
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THE RECEIVING CHANNEL. THE AREA TO BE PAVED OR RIPRAPPED SHALL BE UNDERCUT
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°
DEWATER BEFORE REMOVAL OF THE IMPERVIOUS DIKE. WHEN
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1' MIN. SO THAT THE INVERT OF THE APRON SHALL BE AT THE SAME GRADE (FLUSH) WITH THE
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SURFACE OF THE RECEIVING CHANNEL. THE APRON SHALL HAVE A CUTOFF OR TOE
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DEWATERING AREAALL DIRTY WATER MUST BE PUMPED THROUGH
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CHANNEL
1'
MIN. WALL AT THE DOWNSTREAM END.
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A SILT BAG. REMOVE IMPERVIOUS DIKES, PUMPS, AND TEMPORARY
SILT BAG PROFILE
FILTER FABRIC LAP 3. THE WIDTH OF THE END OF THE APRON SHALL BE EQUAL TO THE BOTTOM WIDTH OF THE
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FLEXIBLE HOSE/PIPING STARTING WITH THE DOWNSTREAM DIKE
(IF NEEDED) RECEIVING CHANNEL. MAXIMUM TAPER TO RECEIVING CHANNEL 5:1
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FIRST.
ELEVATION
4. ALL SUBGRADE FOR STRUCTURE TO BE COMPACTED TO 95% OR GREATER.
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5. THE PLACING OF FILL, EITHER LOOSE OR COMPACTED IN THE RECEIVING CHANNEL
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SHALL NOT BE ALLOWED.
NO BENDS OR CURVES IN THE HORIZONTAL ALIGNMENT OF THE APRON WILL BE
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6. ONCE THE WORKING AREA IS COMPLETED, REMOVE ALL RIP RAP
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AND IMPERVIOUS DIKES AND STABILIZE DISTURBED AREAS WITH
D EWATE R I N G & BYPASS PUMPING
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PERMITTED.
7. FILTER FABRIC SHALL BE INSTALLED ON COMPACTED SUBGRADE PRIOR TO PLACEMENT
SEED AND MULCH. 3
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RIP RAP
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NOT TO SCALE
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OF RIP RAP.
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7. ALL WORK IN CHANNEL MUST BE COMPLETED BEFORE REMOVING
IMPERVIOUS DIKE.
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8. ANY DISTURBED AREA FROM END OF APRON TO RECEIVING CHANNEL MUST BE
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PROJ. MGR.: DNP
DESIGN BY: DNP
DRAWN BY: NBH
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END OF APRON
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NOTE: -
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PROJ. DATE: AUG. 2019
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PLAN MINIMUM H=2/3
LAYER OF FILTER
DRAWING NUMBER:
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PIPE DIAMETER FABRIC
5 RIPRAP APRON AT PIPE OUTFALLS
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EC7 OF 7
SECTION B-B
EC7 NOT TO SCALE
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WKD PROJ. NO.:
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