3-PLD ESC Plan 3rd Submittal

TRIANGLE QUARRY
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RDU
COUNTY AIRPORT
LINE
UMSTEAD
STATE
LAKE SITE PARK
CRABTREE
EXIST
QUARRY
4
NC-54
NORTH
VICINITY MAPNTS
PROJECT NARRATIVE
THE PURPOSE OF THIS CONSTRUCTION ACTIVITY IS TO CLEAR THE SITE (WEST
OF CRABTREE CREEK) TO ACCOMMODATE THE MINING OPERATION, AND TO
IMPROVE THE EXISTING MINING ROAD (EAST OF CRABTREE CREEK).
NPDES NOTES:
I. SEDIMENT BASIN OUTLET STRUCTURES:
SEDIMENT BASINS AND TRAPS WITH DRAINAGE AREAS OF ONE ACRE OR
GREATER SHALL USE OUTLET STRUCTURES THAT WITHDRAW WATER FROM
THE SURFACE.
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- RDU EXPANSION
EROSION CONTROL PLAN
WAKE COUNTY, NORTH CAROLINA
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EXISTING
QUARRY ROAD
IMPROVEMENTS
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7
EXISTING
QUARRY -
NEW QUARRY EXPANSION
CONSTRUCTION SCHEDULE
PHASE 1
1. OBTAIN LAND -DISTURBING / MINING PERMIT.
2. IMPROVE EXISTING ENTRANCE FROM OLD REEDY CREEK ROAD AS ILLUSTRATED ON
APPROVED PLAN FOR EQUIPMENT AND MATERIAL ACCESS.
3. REMOVE TIMBER ONLY AS NEEDED FOR ACCESS AND INSTALLATION OF EROSION
CONTROL MEASURES AND FOR CONSTRUCTION OF PROPOSED SECURITY FENCE.
INSTALL TEMPORARY DIVERSIONS WITH LINERS AS SPECIFIED ON THE CHART ON
THE DETAIL SHEET, SILT FENCE, SEDIMENT BASINS OR OTHER MEASURES AS
SHOW ON THE APPROVED PLAN. CLEAR ONLY AS NECESSARY TO INSTALL THESE
DEVICES. SEED TEMPORARY DIVERSIONS, BERMS AND BASINS IMMEDIATELY AFTER
CONSTRUCTION. MAINTAIN DEVICES AS NEEDED.
* CONSTRUCTION OF THE DIVERSION CHANNEL WITH REQUIRED LINER ON THE
EASTERN SIDE, ADJACENT TO CRABTREE CREEK, SHALL BE CONSTRUCTED IN
AN EXPEDIENT MANNER, AND VEGETATION ESTABLISHED IMMEDIATELY AFTER
CONSTRUCTION. ENSURE SILT FENCE AT TOE OF SLOPE IS INSTALLED AND
FUNCTIONING AT ALL TIMES.
4. PROCEED TO PHASE 2.
PHASE 2
5. RELOCATE THE CONSTRUCTION ENTRANCE AS SHOWN ON PLAN.
6. BEGIN CONSTRUCTION OF PERMANENT BERM. INSTALL RCP CROSS PIPES
AS SHOWN ON PLAN.
7. STABILIZE BERM AS AREAS ARE BROUGHT UP TO FINISH GRADE WITH
VEGETATION. SEED AND MULCH DENUDED AREAS PER GROUND
STABILIZATION TIME FRAMES.
8. ALL REMAINING PERMANENT EROSION CONTROL DEVICES SUCH AS VELOCITY
DISSIPATERS SHOULD BE INSTALLED NOW.
9. ONCE PROPOSED ACCESS BRIDGE IS CONSTRUCTED, BEGIN CLEARING AND
GRUBBING. LOG TRUCKS WILL LEAVE THE SITE VIA THE EXISTING
QUARRY ENTRANCE
10. MAINTAIN DEVICES AS NEEDED. RELOCATE EROSION CONTROL DEVICES AS
NEEDED TO ACCOMMODATE CONSTRUCTION.
11. NO EROSION CONTROL MEASURES SHALL BE REMOVED WITHOUT THE
APPROVAL OF THE ENVIRONMENTAL ENGINEER.
12. NCDEQ OR NCDEMLR RESERVE THE RIGHT TO REQUIRE THE PERMITTEE TO
PROVIDE ADDITIONAL EROSION CONTROL MEASURES SHOULD THE PLAN OR
ITS IMPLEMENTATION PROVE TO BE INADEQUATE.
13. STABILIZE SITE AS AREAS ARE BROUGHT UP TO FINISH GRADE WITH
VEGETATION. SEED AND MULCH DENUDED AREAS WITHIN (21) CALENDAR
DAYS OF COMPLETION OF ANY PHASE OF CONSTRUCTION. PERMANENT
GROUND COVER SHALL BE INSTALLED ON ALL DISTURBED AREAS WITHIN 15
WORKING DAYS OR 90 CALENDAR DAYS (WHICHEVER IS SHORTER)
FOLLOWING COMPLETION OF CONSTRUCTION OR DEVELOPMENT.
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VICINITY MAP
SCALE: 1 " = 500'
EXISTING QUARRY ROAD
IMPROVEMENTS
CONSTRUCTION SCHEDULE
PHASE 1
1. OBTAIN LAND -DISTURBING / MINING PERMIT.
2. PROCEED WITH TIMBERING OPERATIONS. NO STUMP REMOVAL IS ALLOWED.
INSTALL TEMPORARY DIVERSIONS, SILT FENCE, SEDIMENT BASINS OR OTHER
MEASURES AS SHOWN ON THE APPROVED PLAN. CLEAR ONLY AS
NECESSARY TO INSTALL THESE DEVICES. SEED TEMPORARY DIVERSIONS,
BERMS AND BASINS IMMEDIATELY AFTER CONSTRUCTION.
3. BEGIN CLEARING AND GRUBBING. MAINTAIN DEVICES AS NEEDED.
4. PROCEED TO PHASE 2.
PHASE 2
5. BEGIN EXPANSION OF EXISTING QUARRY ROAD. INSTALL CONCRETE BLOCK
WALLS WHEN REQUIRED AS FILLING OCCURS. STABILIZE AS AREAS ARE
BROUGHT UP TO FINISH GRADE WITH VEGETATION. SEED AND MULCH
DENUDED AREAS PER GROUND STABILIZATION TIME FRAMES.
6. ALL REMAINING PERMANENT EROSION CONTROL DEVICES SUCH AS VELOCITY
DISSIPATERS SHOULD BE INSTALLED NOW.
7. MAINTAIN DEVICES AS NEEDED. RELOCATE EROSION CONTROL DEVICES AS
NEEDED TO ACCOMMODATE CONSTRUCTION.
8. NO EROSION CONTROL MEASURES SHALL BE REMOVED WITHOUT THE
APPROVAL OF THE ENVIRONMENTAL ENGINEER.
9. NCDEQ OR NCDEMLR RESERVE THE RIGHT TO REQUIRE THE PERMITTEE TO
PROVIDE ADDITIONAL EROSION CONTROL MEASURES SHOULD THE PLAN OR
ITS IMPLEMENTATION PROVE TO BE INADEQUATE.
10. STABILIZE SITE AS AREAS ARE BROUGHT UP TO FINISH GRADE WITH
VEGETATION. SEED AND MULCH DENUDED AREAS WITHIN (21) CALENDAR
DAYS OF COMPLETION OF ANY PHASE OF CONSTRUCTION. PERMANENT
GROUND COVER SHALL BE INSTALLED ON ALL DISTURBED AREAS WITHIN 15
WORKING DAYS OR 90 CALENDAR DAYS (WHICHEVER IS SHORTER)
FOLLOWING COMPLETION OF CONSTRUCTION OR DEVELOPMENT.
NORTH
BRIDGE CONSTRUCTION
SCHEDULE
SITE DATA
1. DEVELOPMENT NAME:
2. WAKE COUNTY P.I.N.s:
3. WATERSHED:
4. DISTURBED AREA
5. FEMA INFORMATION
6. DEVELOPER:
DRAWING INDEX
TRIANGLE QUARRY - RDU EXPANSION
PORTION OF 0767-32-4317
PORTION OF 0766-80-9143
NEUSE RIVER BASIN
62.0 ACRES
THE PROPERTY CONTAINS FEMA 100-YR FLOOD PLAIN PER FLOOD
INSURANCE RATE MAP
3720076600J, PANEL 0766 EFFECTIVE DATE MAY 2, 2006.
WAKE STONE CORPORATION
PO BOX 190
KNIGHTDALE NC 27545
PHONE: [phone]
SITE
1
COVER SHEET
SITE
2
OVERALL EROSION CONTROL PLAN
SITE
3
NOT USED
SITE
4
NEW QUARRY EXPANSION
- PHASE
1 EROSION
CONTROL
PLAN SHEET 1 OF 2
SITE
5
NEW QUARRY EXPANSION
- PHASE
1 EROSION
CONTROL
PLAN SHEET 2 OF 2
SITE
6
NEW QUARRY EXPANSION
- PHASE
2 EROSION
CONTROL
PLAN SHEET 1 OF 2
SITE
7
NEW QUARRY EXPANSION
- PHASE
2 EROSION
CONTROL
PLAN SHEET 2 OF 2
SITE
8
EXISTING QUARRY ROAD
IMPROVEMENTS
SHEET
1 OF 2
SITE
9
EXISTING QUARRY ROAD
IMPROVEMENTS
SHEET
2 OF 2
SITE
10
DETAILS
SITE
11
DETAILS
SITE
12
DETAILS
1. FLAG CLEARING LIMITS FOR BRIDGE APPROACHES, END BENTS, WING WALLS, AND
PERIMETER EROSION AND SEDIMENTATION CONTROL MEASURES.
2. CLEAR AND GRUB ONLY AS NEEDED FOR CONSTRUCTION OF PERIMETER EROSION AND
SEDIMENTATION CONTROL MEASURES.
3. INSTALL PERIMETER SILT FENCING/REINFORCED SILT FENCING/SILT FENCE OUTLETS AND
TEMPORARY BASINS #3 (AND ASSOCIATED CULVERT AND DIVERSION CHANNELS) AND #7
AS ILLUSTRATED ON THE E&SC PLAN SHEETS. SEED DIVERSIONS, BASINS, AND ALL
ASSOCIATED LAND DISTURBANCE IMMEDIATELY AFTER CONSTRUCTION.
4. CLEAR AND GRUB REMAINING AREA FOR BRIDGE APPROACHES, END BENTS, AND WING
WALLS.
5. EXCAVATE AREA REQUIRED FOR FOUNDATIONS/FOOTINGS. REMOVE SPOIL TO SUITABLE
STORAGE AREAS.
6. INSTALL DRIVEN HP 12 X 53 STEEL PILES TO REFUSAL.
7. INSTALL FORMS FOR PLACEMENT OF CONCRETE FOUNDATIONS/FOOTINGS.
8. PLACE CONCRETE IN FOUNDATIONS.
9. REMOVE CONCRETE FORMS FROM FOUNDATIONS ONCE CURED.
10. INSTALL FORMS FOR PLACEMENT OF CONCRETE END BENTS, POUR END BENTS, AND
STRIP FORMS ONCE CURED.
11. INSTALL FORMS FOR PLACEMENT OF CONCRETE IN WING WALLS, POUR WING WALLS,
AND STRIP FORMS ONCE CURED.
12. BACKFILL APPROACH AREAS BEHIND END BENTS AND WING WALLS.
13. SET PRECAST CONCRETE BEAMS.
14. FORM, POUR, AND STRIP CONCRETE BRIDGE DECK.
15. FORM, POUR, AND STRIP CONCRETE BARRIER RAILS AND MEDIAN BARRIER.
16. FORM, POUR, AND STRIP EAST END AND WEST END APPROACH SLABS.
17. GRADE FINAL APPROACHES TO PROVIDE POSITIVE DRAINAGE TO THE DEPLETED TRIANGLE
QUARRY PIT.
18. INSTALL PERMANENT SEEDING/ESTABLISH GROUND COVER ON DISTURBED AREAS,
INCLUDING RIPARIAN PLANTING AS NEEDED.
PREVENTION OF SEDIMENT LOSS TO CRABTREE CREEK:
TEMPORARY BASIN #3, TEMPORARY BASIN #7, AND ASSOCIATED DIVERSIONS AND CULVERTS
WILL BE CONSTRUCTED PRIOR TO BRIDGE CONSTRUCTION. ONCE THE END BENT AND WING
WALLS ARE COMPLETE ON THE SOUTH END (EAST SIDE OF CRABTREE CREEK) OF THE
BRIDGE, THE APPROACH AREA WILL BE FILLED AND COMPACTED TO FINAL GRADE TO
PROVIDE DRAINAGE TO TEMPORARY BASIN #7 DURING THE REMAINDER OF BRIDGE
CONSTRUCTION. ONCE THE PERIMETER RETAINING WALL ON EITHER SIDE OF THE BRIDGE IS
COMPLETE, THE ENTIRE PERIMETER AREA, INCLUDING THE BRIDGE APPROACH, WILL BE
GRADED TO PROVIDE POSITIVE DRAINAGE TO THE EXISTING QUARRY PIT. ONCE THE END
BENT AND WING WALLS ON THE WEST SIDE OF CRABTREE CREEK ARE COMPLETED, THE
APPROACH AREA BETWEEN THE WING WALLS WILL BE FILLED AND COMPACTED WITH A
-0.5% GRADE FROM THE END BENT BACK TO TEMPORARY BASIN #3 FOR THE FOR THE
REMAINDER OF BRIDGE CONSTRUCTION. ONCE THE BRIDGE DECK AND BARRIER RAILS ARE
COMPLETED, THE APPROACH AREA ON THE NORTH END (WEST SIDE OF CRABTREE CREEK)
OF THE BRIDGE WILL BE BROUGHT TO FINAL GRADE TO PROVIDE POSITIVE DRAINAGE
ACROSS THE BRIDGE TO THE EXISTING QUARRY PIT. HOWEVER, ALL AREAS NORTH OF THE
WING WALLS WILL BE GRADED TO PROVIDE POSITIVE DRAINAGE TO TEMPORARY BASIN #3
UNTIL SUCH TIME AS PIT DEVELOPMENT IN THE EXPANSION AREA ALLOWS FOR CAPTURE,
TREATMENT, AND DISCHARGE TO THE EXISTING PIT.
PERMANENT GROUND STABILIZATION TIMELINE
Table 3: Required Ground Stabilization Timeframes
Stabilize within,
Site Area this many calendar
Timeframe Variations
Description days after ceasing
land disturbance
(a) Perimeter dikes, 7 None
swales, ditches, and
erimeter slopes ....................
7 (b) High Quality Water None
(HQW) Zones
7
(c) Slopes steeper than
3A
■ if slopes are 10'or less in length and are not
steeper than 2:1, 14 days are allowed
■ 7 days for slopes greater than SO' in length
and vvi Lh slopes steepE`r than 4:1
14
■ 7 bays fir perimeter dikes, swates, ditches,
(d) Slopes 3,1 to 4:1
perimeter slopes, and HQVV Zones
■ 10 days for the Falls Lake Watershed
■ 7 days far perimeter dikes, swal es, ditches,
Z4
perimeter slopes, and HQW Zones
(e) Areas with slopes
■ 10 days f❑r the Falls Lake Watershed unless
flatter than 4:1
there is zero slope.
AFTER THE PERMANENT CESSATION OF CONSTRUCTION ACTIVITIES ANY AREAS WITH TEMPORARY GROUND
STABILIZATION SHALL BE CONVERTED TO PERMANENT GROUND STABILIZATION AS SOON AS PRACTICABLE
BUT IN NO CASE LONGER THAN 90 CALENDAR DAYS AFTER THE LAST LAND DISTURBING ACTIVITY.
TEMPORARY GROUND STABILIZATION SHALL BE MAINTAINED IN A MANNER TO RENDER THE SURFACE
STABLE AGAINST ACCELERATED EROSION UNTIL PERMANENT GROUND STABILIZATION IS ACHIEVED
PIEDMONT LAND DESIGN, LLP
8522-204 SIX FORKS ROAD
RALEIGH, NORTH CAROLINA 27615
919.845.7600 PHONE
919.845.7703 FAX
ENGR. FIRM LICENSE #F-0843
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ISSUED: 16 MAR 2020
REVISIONS:
10 30 SEP 2020
PER NCDEQ COMMENTS
02 05 MAR 2021
PER NCDEQ COMMENTS
DRAWN BY: MILS
CHECKED BY: MILS
PROJECT: WSRDUQ
COVER
C,
DWG. NO. SITE 1

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2. UPON CONSTRUCTION OF ALL BASINS, IMMEDIATELY STABILIZE ALL / / I I I \ \ \ \ \ \ - - - \ I C� / / / /
PROPOSED SECURITY FENCING, / IIII 1 \ \ \ \ \ -- -_--- \ \ � / \ \ \ - -- �, / / / / / / / / // / / / / / / / / / / / / / I
SIDE SLOPES WITH SEED AND MAT SIDE. / / I I I I I 1 \\ \ \ \ \ \ \ \ -\ -\ \\ � \� \\ �� -- -� 1 O / / / / / / // / / // /// / / / / /// // /// /
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RBANRAIIEKN1..1.1
8522-204 SIX FORKS ROAD
RALEIGH, NORTH CAROLINA 27615
919.845.7600 PHONE
919.845.7703 FAX
ENGR. FIRM LICENSE #F-0843
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REV I SI ON S:
10 30 SEP 2020
PER NCDEQ COMMENTS
�2 05 MAR 2021
PER NCDEQ COMMENTS
DRAWN BY: MLS
CHECKED BY: MILS
PROJECT: WSRDUQ
NEW QUARRY EXPANSION
PHASE 1 EROSION
CONTROL PLAN
1 OF 2
DWG. NO. SITE 4

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RBAR&DIRNUP
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RALEIGH, NORTH CAROLINA 27615
919.845.7600 PHONE
919.845.7703 FAX
ENGR. FIRM LICENSE #F-0843
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10 30 SEP 2020
PER NCDEQ COMMENTS
02 05 MAR 2021
PER NCDEQ COMMENTS
DRAWN BY: MILS
CHECKED BY: MILS
PROJECT: WSRDUQ
NEW QUARRY EXPANSION
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8522-204 SIX FORKS ROAD
RALEIGH, NORTH CAROLINA 27615
919.845.7600 PHONE
919.845.7703 FAX
ENGR. FIRM LICENSE #F-0843
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EROSION CONTROL NOTES:
1. THE DISTURBED AREA BETWEEN THE PRIMARY EROSION AND
SEDIMENTATION CONTROL MEASURES AND THE DIVERSION DITCH
SHALL BE SEEDED AND MULCHED IMMEDIATELY.
2. UPON CONSTRUCTION OF ALL BASINS, IMMEDIATELY STABILIZE ALL
SIDE SLOPES WITH SEED AND MAT SIDE.
3. SEE CHART ON DETAIL SHEET FOR TEMPORARY DIVERSION DITCH
MINIMUM DIMENSIONS AND LINER REQUIREMENTS.
4. SEE CHART ON DETAIL SHEET FOR ENERGY DISSIPATER
DIMENSIONS AND REQUIREMENTS.
5. SEE CHART ON DETAIL SHEET FOR SEDIMENT BASIN DIMENSIONS
AND DESIGN DATA.
- -
PROPERTY LINE/PERMIT B❑UDARY
LIMITS OF DISTURBANCE
TEMP❑RARY DIVERSI❑N DITCH
LINER AS N❑TED ❑N PLAN
EV
SILT FENCE
SILT FENCE OUTLET
CHECK DAM
NEUSE RIVER BUFFER Z❑NE 1
NEUSE RIVER BUFFER Z❑NE 2
/ // // / I e7/ / /ov I 1 1111 111 I II
/ lI / I / // / 'i�i / / a V1 1/ l lllli�I
NORTH
0 60 120 180
SCALE IN FEET : 1 "=60'
RBAqlAAIB@IIjUP
8522-204 SIX FORKS ROAD
RALEIGH, NORTH CAROLINA 27615
919.845.7600 PHONE
919.845.7703 FAX
ENGR. FIRM LICENSE #F-0843
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05 MAR 2021
PER NCDEQ COMMENTS
DRAWN BY: MILS
CHECKED BY: MLS
PROJECT: WSRDUQ
EXISTING
QUARRY ROAD
IMPROVEMENTS
1 OF 2
DWG. NO. SITE 8

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M ATCH L I N E -SEE SHEET 1 OF 2 FOR CONTINUATION
EROSION CONTROL NOTES:
1. THE DISTURBED AREA BETWEEN THE PRIMARY EROSION AND
SEDIMENTATION CONTROL MEASURES AND THE DIVERSION DITCH
SHALL BE SEEDED AND MULCHED IMMEDIATELY.
2. UPON CONSTRUCTION OF ALL BASINS, IMMEDIATELY STABILIZE ALL
SIDE SLOPES WITH SEED AND MAT SIDE.
3. SEE CHART ON DETAIL SHEET FOR TEMPORARY DIVERSION DITCH
MINIMUM DIMENSIONS AND LINER REQUIREMENTS.
4. SEE CHART ON DETAIL SHEET FOR ENERGY DISSIPATER
DIMENSIONS AND REQUIREMENTS.
5. SEE CHART ON DETAIL SHEET FOR SEDIMENT BASIN DIMENSIONS
AND DESIGN DATA.
EROSION CONTROL LEGEND
— —
PROPERTY LINE/PERMIT B❑UDARY
LIMITS OF DISTURBANCE
TEMPORARY DIVERSI❑N DITCH
LINER AS NOTED ON PLAN
SF
SILT FENCE
SILT FENCE OUTLET
CHECK DAM
NEUSE RIVER BUFFER ZONE 1
NEUSE RIVER BUFFER ZONE Z
NORTH
0 60 120 180
SCALE IN FEET : 1 "=60'
8522-204 SIX FORKS ROAD
RALEIGH, NORTH CAROLINA 27615
919.845.7600 PHONE
919.845.7703 FAX
ENGR. FIRM LICENSE #F-0843
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I SSU ED: 16 MAR 2020
REV I SI ON S.
0 30 SEP 2020
PER NCDEQ COMMENTS
DRAWN BY: MLS
CHECKED BY: MLS
PROJECT: WSRDUQ
EXISTING
QUARRY ROAD
IMPROVEMENTS
2OF2
DWG. NO. SITE 9

PLAN VIEW
FENCE AND FABRIC
BURIED N TRENCH
STEEL POST
I
2'
6"X6" TRENCH,
BACKFILLED AND
COMPACTED
NOTES:
1. BAFFLE MATERIAL SHOULD BE SECURED AT THE BOTTOM AND SIDES
USING STAPLES OR BY TRENCHING AS FOR SILT FENCE.
2. MOST OF THE SEDIMENT WILL ACCUMULATE IN THEIST BAY,
WHICH SHOULD BE READILY ACCESSIBLE FOR MAINTENANCE.
3. PROVIDE 3 BAFFLES (USE TWO IF LESS THAN 20 FEET IN LENGTH). PROVIDE EXISTING
5 BAFFLES FOR DRAINAGE AREAS GREATER THAN 10 ACRES.
4. BAFFLE SHALL BE 700 G/M2 COIR EROSION BLANKET. ROADWAY
5. TOPS OF BAFFLES SHOULD BE 2 INCHES LOWER THAN THE TOP OF THE BERMS
6. INSPECT BAFFLES FOR REPAIR ONCE A WEEK AND AFTER EACH RAINFALL
CROSS SECTION
NOTES:
50' MIN.
BUT SUFFICIENT TO KEEP
1. PUT SILT FENCE OR TREE PROTECTION FENCE UP TO
ENSURE CONSTRUCTION ENTRANCE IS USED.
SEDIMENT ON SITE
2. IF CONSTRUCTION ON THE SITES ARE SUCH THAT THE MUD
IS NOT REMOVED BY THE VEHICLE TRAVELING OVER THE
STONE, THEN THE TIRES OF THE VEHICLES MUST BE WASHED
2"-3" STONE TO BE USED
25' OR WIDTH OF
BEFORE ENTERING THE PUBLIC ROAD.
(SURGE STONE OR RAILROAD
PROPOSED STREET,
BALLAST)
WHICHEVER IS
3. MAINTAIN GRAVEL PAD IN A CONDITION TO PREVENT MUD OR
GREATER.
SEDIMENT FROM LEAVING CONSTRUCTION SITE. ENTRANCE
WILL REQUIRE PERIODIC REMOVAL OF SEDIMENT -LADEN
STONE AND REPLACEMENT WITH FRESH STONE.
PLAN VIEW
SUPPORT ROPE SUPPORT POST
TO WIRE TO 24" INTRO BOTTOM STAKE TO
PREVENT SAGGING OR SIDE SUPPORT WIRE
EXISTING ROADWAY
35' MIN.
NEW CONSTRUCTION
15' MIN.
12" MIN.
L 1�0
6" MIN.
\ \ \\
MESH OR
CTRE
\
/\\ /\\
%//\\\ /\ ���\
TOM
��// \>/
TRENCHED INTO BOTOIR
OR SIDE
/1i1;
ii\\
FABRIC UNDER STONE
CROSS SECTION
STANDARD BAFFLES DETAIL
\ \ \ 03 / / / CLASS 1 RIP RAP (SEE SECTION THRU BASIN BELOW)
\ J
\ INVERT � RIP RAP HEADWALL
i / I
#5 WASHED STONE. 1'-0" THICK x 3'-0" HIGH MINIMUM
sE�� ////llllllllllllll�'% � / l
�% MENT STORAGE AREA
� I PERSPECTIVE VIEW
/ NO SCALE
/
SEDIMENT STORAGE
AREAS TO BE DISTURBED RIP RAP
(CUT, FILL, ETC.) FLOOD STORAGE ZONE HEADWALL
Ci
\ PIPE NATURAL GROUND
"tow 1 � INVERT
\� 3-----------------
1.5'
FLOW �
1.5 -
- ------------------------
- �m
- CLASS 1 RIP -RAP
MAXIMUM SEDIMENT DEPTH #5 WASHED STONE
(CLEAN OUT POINT)
SECTION THRU CATCH BASIN, FILTER AND CULVERT PIPE
NO SCALE
STANDARD HORSESHOE INLET PROTECTION
TOP ELEVATION OF STORMWATER 0.5'-1'
#5 WASHED MAX. <
I STONE �1 22
U)
EXISTING SLOPE
= II�
#1 RIP -RAP
VARIES
RAP
FRONT VIEW
NOTE: REMOVE SEDIMENT ACCUMULATION FROM BEHIND
CHECK DAMS TO PREVENT DAMAGE TO CHANNEL VEGETATION.
FLOW SHOULD BE MAINTAINED THROUGH THE DAM.
STANDARD CHECK DAM
GROUND STABILIZATION AND MATERIALS HANDLING PRACTICES FOR COMPLIANCE WITH
THE NCGO1 CONSTRUCTION GENERAL PERMIT
Implementing the details and specifications on this plan sheet will result in the construction
activitybeing considered compliant with the Ground Stabilization and Materials Handling
g P g
sections of the NCGO1 Construction General Permit (Sections E and F, respectively). The
permittee shall comply with the Erosion and Sediment Control plan approved by the
delegated authority having jurisdiction. All details and specifications shown on this sheet
may not apply depending on site conditions and the delegated authority having jurisdiction.
Required Ground Stabilization Timeframes
Stabilize within this
Site Area Description
many calendar
Timeframe variations
days after ceasing
land disturbance
(a) Perimeter dikes,
swales, ditches, and
7
None
perimeter slopes
(b) High Quality Water
7
None
(HQW) Zones
(c) Slopes steeper than
If slopes are 10' or less in length and are
3:1
7
not steeper than 2:1, 14 days are
allowed
-7 days for slopes greater than 50' in
length and with slopes steeper than 4:1
7 days for perimeter dikes, swales,
(d) Slopes 3:1 to 4:1
14
ditches, perimeter slopes and HQW
Zones
-10 days for Falls Lake Watershed
-7 days for perimeter dikes, swales,
(e) Areas with slopes
ditches, perimeter slopes and HOW Zones
flatter than 4:1
14
-10 days for Falls Lake Watershed unless
there is zero slope
Note: After the permanent cessation of construction activities, any areas with temporary
ground stabilization shall be converted to permanent ground stabilization as soon as
practicable but in no case longer than 90 calendar days after the last land disturbing
activity. Temporary ground stabilization shall be maintained in a manner to render the
surface stable against accelerated erosion until permanent ground stabilization is achieved.
GROUND STABILIZATION SPECIFICATION
Stabilize the ground sufficiently so that rain will not dislodge the soil. Use one of the
techniques in the table below:
Temporary Stabilzauon
Permanem Stabilaation
+ Tempurarygrassseedcweredwithstraorur
+ Perma,errcgrassseejcwereJWchs[ra Cr
other mukhesandtackifiers
othermulches andtackifias
+ HY'dreseeding
• Geotertilef�bricssudiaspermanentsoil
+ Rolled ern9on mntrnl prndurtswith nr
reinforcement matting
withouttemporary grass seed
Fydroseeding
+ Appropriaely applied straw or other mulch
+ Shrubs or other pamarerlc plan zings covered
• Plastic sheeting
withmulch
• Uniform and &EnNdixribucedgraundcover
suffi ci efr to restrain em s on
• Structurd methods su:h as co-ncrete, wphdt c r
retai ningw A I s
• Rolled erosion control productswith grate seed
POLYACRYLAMIDES (PAMS) AND FLOCCULANTS
1. Select flocculants that are appropriate for the soils being exposed during
construction, selecting from the NC DWR List of Approved PAMS/Flocculants.
2. Apply flocculants at or before the inlets to Erosion and Sediment Control Measures.
3. Apply flocculants at the concentrations specified in the NC DWR List of Approved
PAMS/Flocculants and in accordance with the manufacturer's instructions.
4. Provide ponding area for containment of treated Stormwater before discharging
offsite.
5. Store flocculants in leak -proof containers that are kept under storm -resistant cover
or surrounded by secondary containment structures.
SIDE VIEW
CONSTRUCTION NOTES:
HEIGHT & WIDTH DETERMINED BY
EXISTING TOPOGRAPHY AND
SEDIMENT STORAGE REQUIRED.
KEY RIP RAP INTO THE DAM
FOR STABILIZATION.
EXISTING --
GROUND
STEP SEQUENCE
EQUIPMENT AND VEHICLE MAINTENANCE
1. Maintain vehicles and equipment to prevent discharge of fluids.
2. Provide drip pans under any stored equipment.
3. Identify leaks and repair as soon as feasible, or remove leaking equipment from the
project.
4. Collect all spent fluids, store in separate containers and properly dispose as
hazardous waste (recycle when possible).
5. Remove leaking vehicles and construction equipment from service until the problem
has been corrected.
6. Bring used fuels, lubricants, coolants, hydraulic fluids and other petroleum products
to a recycling or disposal center that handles these materials.
LITTER, BUILDING MATERIAL AND LAND CLEARING WASTE
1. Never bury or burn waste. Place litter and debris in approved waste containers.
2. Provide a sufficient number and size of waste containers (e.g dumpster, trash
receptacle) on site to contain construction and domestic wastes.
3. Locate waste containers at least 50 feet away from storm drain inlets and surface
waters unless no other alternatives are reasonably available.
4. Locate waste containers on areas that do not receive substantial amounts of runoff
from upland areas and does not drain directly to a storm drain, stream or wetland.
5. Cover waste containers at the end of each workday and before storm events or
provide secondary containment. Repair or replace damaged waste containers.
6. Anchor all lightweight items in waste containers during times of high winds.
7. Empty waste containers as needed to prevent overflow. Clean up immediately if
containers overflow.
8. Dispose waste off -site at an approved disposal facility.
9. On business days, clean up and dispose of waste in designated waste containers.
PAINT AND OTHER LIQUID WASTE
1. Do not dump paint and other liquid waste into storm drains, streams or wetlands.
2. Locate paint washouts at least 50 feet away from storm drain inlets and surface
waters unless no other alternatives are reasonably available.
3. Contain liquid wastes in a controlled area.
4. Containment must be labeled, sized and placed appropriately for the needs of site.
5. Prevent the discharge of soaps, solvents, detergents and other liquid wastes from
construction sites.
PORTABLE TOILETS
1. Install portable toilets on level ground, at least 50 feet away from storm drains,
streams or wetlands unless there is no alternative reasonably available. If 50 foot
offset is not attainable, provide relocation of portable toilet behind silt fence or place
on a gravel pad and surround with sand bags.
2. Provide staking or anchoring of portable toilets during periods of high winds or in high
foot traffic areas.
3. Monitor portable toilets for leaking and properly dispose of any leaked material.
Utilize a licensed sanitary waste hauler to remove leaking portable toilets and replace
with properly operating unit.
TOP OF SILT FENCE
MUST BE AT LEAST
ABOVE THE TOP OF
THE WASHED STONE
STEEL I
WIRE FENCE
HARDWARE CLOTH
FILTER OF #
WASHED STONE
STANDARD CONSTRUCTION ENTRANCE
4' MIN. - I SILT FENCE
STEEL FENCE POST CLOTH IN TRENCH
SET MAX 2' APART
`7 MIN. 24' INTO SOLI
I GROUND
3' FILTER FABRIC
ON GROUND
6g60 "q�t oti d NOTES:
1. REMOVE SEDIMENT WHEN HALF OF STONE OUTLET IS COVERED.
8" MI 2. REPLACE STONE AS NEEDED TO ENSURE DEWATERING.
BACKFILL TRENCH AND COMPACT 2'-0"
THOROUGHLY
4" MIN
SECTI❑N VIEW
STANDARD SILT FENCE OUTLET
NOTES,
1, CONSTRUCT THE ENTRANCE TD THE SLOPE DRAIN OF A Attach a horizontal stake 4'
STANDARD FLARED -END SECTION OF PIPE WITH A MINIMUM 6-INCH t0 each vertical stake (nail
METAL TOE PLATE (CROSS-SECTION VIEW), MAKE ALL FITTINGS Berm min.
WATERTIGHT. A STANDARD T-SECTION FITTING MAY ALSO BE USED Of SCfeW t0 VeftIC01 stake) \\
AT THE INLET. to prevent slope drain
2, USE AN EARTHEN DIVERSION TO DIRECT SURFACE RUNOFF from floating.
INTO THE TEMPORARY SLOPE DRAIN, MAKE THE HEIGHT OF THE
BERM OVER THE DRAIN CONDUIT A MINIMUM OF 1.5 FT AND AT 3:1
LEAST 6 INCHES HIGHER THAN THE ADJOINING BERM ON EITHER 1.5' min
SIDE. Hold-down stakes
THE LOWEST POINT OF THE DIVERSION BERM SHOULD BE A
MINIMUM OF I FT
ABOVE THE TOP OF THE DRAIN SO THAT DESIGN FLOW CAN
FREELY ENTER THE PIPE.
3. PROTECT THE OUTLET OF THE SLOPE DRAIN FROM EROSION 10' Spacing
WITH RIPRAP DISSIPATOR. I I-
Plastilcated
Pipe g - I Inlet
=I I �,JTy`v.vr/r..Uryi ...,,.., •
W.v\V y,11,NU'.1✓kA 1J•jy 'fa`V�M-, ,.r. v.. ,•.
Stabilize \��"i,1
6 �IVMv u MW k Yy./
Outlet (\� (\ - r+A•"" \JiH.A Y
LJ v rrn uuANa,F��6HVJJ,..Lryiy ,..
�.vxV1",,n� .. .. ,
-I I I ,,,.. •
r �, a. �V,mvut✓w,h7/,�. 1-1."
4' min Yo-N.N �Idu
level section
Y✓A.N"` �
r.,AW.. �,,T a•4. •
V
Cross -Section View
Plan View
Standard T-section
ONSITE CUNCRETE WASHOUT
STRUCTURE WITH LINER
>� T
B
ML-- --
-'WjW-
m
),sex sm M2--.W.M
M1nW M6 VWIT� ABOVE Mr& VW,R STRIICTIRE
CONCRETE WASHOUTS
1. Do not discharge concrete or cement slurry from the site.
2. Dispose of, or recycle settled, hardened concrete residue in accordance with local
and state solid waste regulations and at an approved facility.
3. Manage washout from mortar mixers in accordance with the above item and in
addition place the mixer and associated materials on impervious barrier and within
lot perimeter silt fence.
4. Install temporary concrete washouts per local requirements, where applicable. If an
alternate method or product is to be used, contact your approval authority for
review and approval. If local standard details are not available, use one of the two
types of temporary concrete washouts provided on this detail.
5. Do not use concrete washouts for dewatering or storing defective curb or sidewalk
sections. Stormwater accumulated within the washout may not be pumped into or
discharged to the storm drain system or receiving surface waters. Liquid waste must
be pumped out and removed from project.
6. Locate washouts at least 50 feet from storm drain inlets and surface waters unless it
can be shown that no other alternatives are reasonably available. At a minimum,
install protection of storm drain inlet(s) closest to the washout which could receive
spills or overflow.
7. Locate washouts in an easily accessible area, on level ground and install a stone
entrance pad in front of the washout. Additional controls may be required by the
approving authority.
8. Install at least one sign directing concrete trucks to the washout within the project
imits. Post signage on the washout itself to identify this location.
9. Remove leavings from the washout when at approximately 75% capacity to limit
overflow events. Replace the tarp, sand bags or other temporary structural
components when no longer functional. When utilizing alternative or proprietary
products, follow manufacturer's instructions.
10. At the completion of the concrete work, remove remaining leavings and dispose of
in an approved disposal facility. Fill pit, if applicable, and stabilize any disturbance
caused by removal of washout.
HERBICIDES, PESTICIDES AND RODENTICIDES
1. Store and apply herbicides, pesticides and rodenticides in accordance with label
restrictions.
2. Store herbicides, pesticides and rodenticides in their original containers with the
label, which lists directions for use, ingredients and first aid steps in case of
accidental poisoning.
3. Do not store herbicides, pesticides and rodenticides in areas where flooding is
possible or where they may spill or leak into wells, stormwater drains, ground water
or surface water. If a spill occurs, clean area immediately.
4. Do not stockpile these materials onsite.
HAZARDOUS AND TOXIC WASTE
1. Create designated hazardous waste collection areas on -site.
2. Place hazardous waste containers under cover or in secondary containment.
3. Do not store hazardous chemicals, drums or bagged materials directly on the ground.
NCGOI GROUND STABILIZATION AND MATERIALS HANDLING EFFECTIVE: 04/01/19
EARTHEN STOCKPILE MANAGEMENT
1. Show stockpile locations on plans. Locate earthen -material stockpile areas at least
50 feet away from storm drain inlets, sediment basins, perimeter sediment controls
and surface waters unless it can be shown no other alternatives are reasonably
available.
2. Protect stockpile with silt fence installed along toe of slope with a minimum offset of
five feet from the toe of stockpile.
3. Provide stable stone access point when feasible.
4. Stabilize stockpile within the timeframes provided on this sheet and in accordance
with the approved plan and any additional requirements. Soil stabilization is defined
as vegetative, physical or chemical coverage techniques that will restrain accelerated
erosion on disturbed soils for temporary or permanent control needs.
STANDARD TEMPORARY SLOPE DRAIN
NPOES Stormwater Discharge Permit for Construction Activities (NC001)
NCDENR/Di>v;sioq of Water Ouab9 r
:.... "NEW STABILIZATION TPAEFRAMES ::.....:.. ..:
�EffectiveAug. 3, 2011)
:SITE AREA
STABILIZATION TIMEFRAME EXCEPTIONS
(DESCRIPTION
........ ............. ..... ............. - - -
:Perimeter dikes,
- ---------.. ...........
7 days -None
swales, ditches,
'slopes
(High Quality Water
7 days
None
(HQVV) Zones
;Slopes steeper than
7 days
If Slopes are 1 G' or less in length and
13:1
are not steeper than 2:1, 14 days are
'
allowed.
- - -
°Slpes 3:1 or flatter
---
14 days
.............. ----------............................... -
7 days for slopes greater than 50' in
fengf#I_
.....
IAlI other areas with
:14 days
_... -- - ----------------------------- .-..-----
None, except for Perimeters and HQU4
-Slopes flatter than 4:1
Zones.
f 8'-01, MAXIMUM
MINIMUM 10
LINE WIRES
FRONT VIEW
STEEL POST
NOTE: WOVEN WIRE FABRIC
1. USE SILT FENCE ONLY WHEN DRAINAGE AREA SILT FENCE FABRIC
DOES NOT EXCEED 1/4 ACRE AND NEVER IN
AREAS OF CONCENTRATED FLOW. _
3'-0" o FILL SLOPE
2. REMOVE SEDIMENT DEPOSITED AS NEEDED TO 26" 3
PROVIDE STORAGE VOLUME FOR THE NEXT RAIN z
AND TO REMOVE PRESSURE ON THE SILT
FENCE.
N
GRADE
I , L8" MIN
2'-0"
BACKFILL TRENCH AND COMPACT
-44" MIN THOROUGHLY
SIDE VIEW
STANDARD TEMPORARY SILT FENCE
IMUM 12-1/2 GAUGE
RMEDIATE WIRES
GRADE
1■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
MEN
■IIII■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■11■
1■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■IIII■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■II■
1■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■IIII■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■11■
1■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■IIII■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■II■
1■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■IIII■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■11■
1■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■IIII■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■II■
1■■■■■■■A■■■■■■■■■■■■■■■■■■■■■■■■■IIII\■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■II■
1■■■■■■■L'■■■■■■■■■■■■■■■■■■■■■■■■■IIII■\■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■11■
1■■■■■■■■\■■■■■■■■■■■■■■■■■■■■■■■■IIII■\■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■II■
1■■■■■■■■1\■■■■■■■■■■■■■■■■■■■■■■■■IIII■■\■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■11■
i
SILT FENCE I I FASTENERS I (-
OVERLAP FABRIC I I I IIII 6" BETWEEN III IIII 3'-0"
6" MIN AT ENDS %I I I (TYP)
_IIII IILi
P(
SILT FENCE EXTENI
INTO TRENCH
--ASTENERS
3" BETWEEN
TYP)
SILT FENCE
NOTES:
1. MAINTENANCE SHALL OCCUR WHEN NECESSARY. POSTS SHALL
BE INSPECTED EVERY SIX MONTHS TO ENSURE STRUCTURAL
INTEGRITY. SILT FENCE SHALL BE INSPECTED WEEKLY AND ALL
MAINTENANCE ISSUES SHALL BE CORRECTED AT THAT TIME.
8"X 4" TRENCH 4^ 1 -r
EXCAVATED UP
SLOPE FROM I I
POLES, BACKFILL LJ
AND COMPACT
SPECIAL SILT FENCE
MWore
Agricultural LirrmbDrLe 2 ionsJacre (3 lonsfacre in clay sails),
Fetitzer 1.000 lbsfacre - 10-10-10
Supefphosphate 500 1bsiacre - 20 analysis
Mulch 121ons,/acfe - small gram straw
Anchor (Asphalt emulsion at 300 9alslacre
Seeding Schediule
Far Sl oul lers, Side i itches. Slopes (Max 3.1)�
Date
Type
Pie ntin!g late
Aug
15-
Talll=escue
300lbslfacre
140V 1
Nov
1-
Tall Fescue & Abruzzi Rye
300 lWacre
Mar 1
Mar
I -Apr
Tall Fescue
300 Ibsfacre
15
Apr
15-
Flu lied Comrnen
25 1 bsfacre
kit
Beli'mud ag ras5
30
Jul 9-Tall
Aug
Fescue AND Browntflp
125 lbslfacre Jail Fescue); 35 Ibs/acre
15
Millet or Sorghum -Sudan
(Britivntop Milletl; :aD lbsifalue (Sarghum-
(Hybrids*
Sudan Hyil
For Sh:outders. Side Ditches. SI s (3.1 to 2A
Date I Type I Plan Vng Rate
Mar Sericea Lespiedeza
1 (saa6fied) an;d use t#1e 50 Wacre �Serkea Lespedeza):
JrIr1 follcv�irlg corrrbinalions:
1
Mar I I
1 Apr Add Tall Fesc a 120 rbslfacre
15
Seedbed Preparation.
1-
Chisel compacted areas and spread topsoil three inches deep over adverse soil
Mar
2.
conditions, if avaaiIable.
Rip the entire area to six inches deep.
1-
Burl
Or add Hulled Common
BeFmudagras:s
25 rbslfacre
3.
Remove all loose rock, raats and other obstructions, leaving SUrface reasonably
30
smooth and uniform.
4.
Apply agricultural lime, fertilizer and superphosphate uniformly and mix with sail
Jui1
Tall Fescue AND Browntop
120 1bslfacre (Ta11 Fescue)- 35 lbslfacre
fsee mixture bell€ w).
kept
Mullel or �hr.m-Sudran
(Sriavmtop Muller: 30 ibsr'acre (50rghL1M-
5-
Continue tillage until a well-puiverized, firm, reasonably uniform seedbed is
Hybrids
Sudan Hybrids
Prepared four to six inches deep.
6.
Seed on a freshly prepared seedbed and cover seed lightly with seeding equipment
Sept
Sericea Lespedeza
or cultipack after seeding.
11-
(rinhulled - rlinsaarified) ARD
70 Ibsiacre (Sekea LespledE--za), 120
7.
Mulch immediately after seeding and anchor mulch.
Mar
Tall Fescue
Ibsiacre Jalt Fescue?
8.
Inspect all seeded areas and make necessary repairs or reseediings within the
y
4
planting season. d possible. 9f stand should be more than 60 la damaged, re-
P 9 1
Nov
establish following the original lime; fertilizer and seeding rates.
establish
9-
Consult S&EC Environmental Engineers an maintenance treatment and fertilization
Mar
AND Abruzzi Rye
25 bslacre
after permanent cover is established-
1
SEEDING SPECIFICATIONS
HIGH
COHE
LOW
SOIL
PUM
ONSITE CONCRETE WASHOUT
STRUCTURE WITH LINER
10'-0" MIN.
A 7
0 CD
CD O
0
0
0
C
0 0
O
�A
SANDBAGS TYP.)
OR STAPLE
10 MIL
1:1 PLASTIC SANDBAGS (TYP.)
SIDE SLOPE LINING OR STAPLES
(TYP.)
CLEARLY MARKED SIGNAGE SECTION A -A
CONCRETE NOTING DEVICE (18"X24" MIN.)
WASHOUT NOTES:
1. ACTUAL LOCATION DETERMINED IN FIELD
2. THE CONCRETE WASHOUT STRUCTURES SHALL BE
MAINTAINED WHEN THE LIQUID AND/OR SOLID REACHES
75% OF THE STRUCTURES CAPACITY.
PLAN 3.CONCRETE WASHOUT STRUCTURE NEEDS TO BE
CLEARY MARKED WITH SIGNAGE NOTING DEVICE.
BELOW GRADE WASHOUT STRUCTURE
1n'_n', KAINI
NOT TO SCALE
SANDBAGS TYP.)
OR STAPLE
10 MIL HIGH
COHESIVE &
PLASTIC LINING LOW FILTRATION
1:1 SIDE SLOPE SOIL BERM
(TYP.)
\ \ O ZI. X � MINI,
\\
00
SECTION B-B
SANDBAGS(TYP.) NOTES:
OR STAPLES1. ACTUAL LOCATION DETERMINED IN FIELD
CLEARLY MARKED SIGNAGE 2. THE CONCRETE WASHOUT STRUCTURES
CONCRETE NOTING DEVICE (18"X24" MIN.) SHALL BE MAINTAINED WHEN THE LIQUID
WASHOUT AND/OR SOLID REACHES 75% OF THE
STRUCTURES CAPACITY TO PROVIDE
ADEQUATE HOLDING CAPACITY WITH A
MINIMUM 12 INCHES OF FREEBOARD.
PLAN 3.CONCRETE WASHOUT STRUCTURE NEEDS
TO BE CLEARY MARKED WITH SIGNAGE
NOTING DEVICE.
ABOVE GRADE WASHOUT STRUCTURE
NOT TO SCALE
NOTES:
1. USE NO. 5 OR NO. 57 STONE FOR SEDIMENT CONTROL STONE.
2. PROVIDE STABILIZED OUTLET TO STREAM BANK.
3. WOOD PALLETS MAY BE USED IN LIEU OF STONE AND GEOTEXTILE AS
DIRECTED. A SUFFICIENT NUMBER OF PALLETS MUST BE PROVIDED
TO ELEVATE THE ENTIRE SPECIAL STILLING BASIN ABOVE NATURAL GROUND.
4. THE SIZE AND NUMBER OF SILT BAGS SHOULD BE BASED ON THE
DEWATERING PUMP AND MANUFACTURER RECOMMENDATIONS.
5. TIGHTLY SECURE THE PUMP DISCHARGE TO THE SILT BAG SLEEVE WITH A
STRAP OR SIMILAR DEVICE TO PREVENT WATER/SEDIMENT FROM LEAKING
WITHOUT TREATMENT.
6. CONTROL PUMPING RATE TO PREVENT EXCESSIVE PRESSURE WITHIN THE SILT
BAG IN ACCORDANCE WITH THE MANUFACTURER RECOMMENDATIONS. AS THE
BAG FILLS WITHIN SEDIMENT, REDUCE THE PUMP RATE.
7. REPLACE THE SILT -BAG WHEN ONE HALF (1/2) FULL OF SEDIMENT.
8. SILT BAG DEVICE MUST BE > 50FT FROM THE TOP OF THE STREAM BANK
AND WATER MUST BE DISCHARGED IN A DIFFUSE MANNER.
9. PUMP INTAKE SHALL DEWATER BASIN FROM SURFACE (FLOATING) WHERE PRACTICABLE
TO PREVENT WITHDRAWAL OF SEDIMENT AND MAXIMIZE WATER QUALITY.
SILT BAG
NOT TO SCALE
RMUDRAfORNUP
8522-204 SIX FORKS ROAD
RALEIGH, NORTH CAROLINA 27615
919.845.7600 PHONE
919.845.7703 FAX
ENGR. FIRM LICENSE #F-0843
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ISSUED: 16 MAR 2020
REVISIONS:
Q 30 SEP 2020
PER NCDEQ COMMENTS
Q 05 MAR 2021
PER NCDEQ COMMENTS
DRAWN BY: MILS
CHECKED BY: MILS
PROJECT: WSRDUQ
DETAILS
DWG. NO. SITE 10

NOTES:
1. TEMPORARY DIVERSION DITCH TO BE USED TO INTERCEPT FLOW AND/OR DIVERT TO A SEDIMENT CONTROL MEASURE OR BMP.
2. SILT SHALL BE REMOVED WHEN DITCH IS ONE-HALF FULL.
3. DTCH SHALL BE RECONSTRUCTED WHEN DAMAGED BY EQUIPMENT OR COVERED BY FILL.
4. STABILIZE DIVERSION DITCH BERM WITH LINER AS SPECIFIED IN THE CHART BELOW.
2' MIN.
WASTE MATERIAL -COMPACT,
SEED & MULCH AFTER
S�Op 2 VAR10 CONSTRUCTION OF DITCH
I _IF
2. W DTH PER
�
III -III -III III -I HART
BELOW �_ I I I I II
I -III -III -I -III_ _ I I -I I
DE III III III. III
CH
CROSS SECTIONAL VIEW
STANDARD TEMPORARY DIVERSION DITCH
Excavate channel to design
Overlap 6" min. grade and cross-section 2
Design depth
Longitudinal
anchor trench
Overcut channel 2" to allow bulking
during seedbed preparation
6- 6"
Typical installation
with erosion control
blankets or turf r ,
reinforcement mats
6,6
Intermittent check slot Longitudinal anchor trench
Shingle -lap spliced ends or begin new
roll in an intermittent check slot
Prepare soil and apply seed before
installing blankets, mats or other
temporary channel liner system 3
NOTES:
1. Design velocities exceeding 2 ft/sec require temporary blankets, mats or similar liners to protect
seed and soil until vegetation becomes established.
2, Grass -lined channels with design velocities exceeding 6 ft/sec should include turf reinforcement
Yeats
TEMPORARY
DIVERSION DITCH
DIMENSIONS
DIVERSION #
WIDTH
(FT)
DEPTH
(FT)
LINER
IA
3
2
STRAW
WITH
NETTING
1B
7
2,50
STRAW
WITH
NETTING
2
(WHERE
STRAW LINER
3
2
STRAW
WITH
NETTING
IS
REQUIRED)
2
(WHERE
RIP RAP LINER
4
2
RIP RAP (D50 U12
IS
RETUIRE2
3
2
1
STRAW
WITH
NETTING
4
(WHERE
STRAW LINER
2
2
STRAW
WITH
NETTING
IS
REQUIRED)
4
(WHERE
RIP RAP LINER
3
1
RIP RAP (D50 12")
IU
RETUIRE2
5
(WHERE
STRAW LINER
2
1
STRAW
WITH
NETTING
IS
RETUIRE2
5
(WHERE
RIP RAP LINER
3
1
STRAW
WITH
NETTING
IS
REQUIRED)
6A
(WHERE
STRAW LINER
2
1
STRAW
WITH
NETTING
IS
RETUIRE2
6 A
(WHERE
RIP RAP LINER
4
1
RIP RAP (D50 12")
IS
RETUIRE2
6B
(WHERE
STRAW LINER
2
2
STRAW
WITH
NETTING
IS
RETUIRE2
6B
(WHERE
RIP RAP LINER
3
1
RIP RAP (D50=12')
IS
RETUIRE2
7
2
1
STRAW
WITH
NETTING
3
2
1
STRAW
WITH
NETTING
B
2
1
STRAW
WITH
NETTING
10
2
2
1
1
STRAW
STRAW
WITH
WITH
NETTING
NETTING
11
2
2
1
STRAW
WITH
NETTING
CONSTRUCTION SPECIFICATIONS
INSTALLATION IN CHANNELS- EXCAVATE TERMINAL TRENCHES (12 INCHES DEEP AND 6
INCHES WIDE) ACROSS THE CHANNEL AT THE UPPER AND LOWER END OF THE LINED CHANNEL
SECTIONS. AT 25-FOOT INTERVALS ALONG THE CHANNEL, ANCHOR THE RECP ACROSS THE
CHANNEL EITHER IN 6 INCH BY 6 INCH TRENCHES OR BY INSTALLING TWO CLOSELY SPACED
ROWS OF ANCHORS. EXCAVATE LONGITUDINAL TRENCHES 6 INCHES DEEP AND WIDE ALONG
CHANNEL EDGES (ABOVE WATER LINE)IN WHICH TO BURY THE OUTSIDE RECP EDGES.
PLACE THE FIRST RECP AT THE DOWNSTREAM END OF THE CHANNEL. PLACE THE END OF
THE FIRST RECP IN THE TERMINAL TRENCH AND PIN IT AT 1 FOOT INTERVALS ALONG THE
BOTTOM OF THE TRENCH.
NOTE: THE RECP SHOULD BE PLACED UPSIDE DOWN IN THE TRENCH WITH THE ROLL ON
THE DOWNSTREAM SIDE OF THE BENCH.
ONCE PINNED AND BACKFILLED, THE RECP IS DEPLOYED BY WRAPPING OVER THE
TOP OF THE TRENCH AND UNROLLING UPSTREAM. IF THE CHANNEL IS WIDER THAN THE
PROVIDED ROLLS, PLACE ENDS OF ADJACENT ROLLS IN THE TERMINAL TRENCH, OVERLAPPING
THE ADJACENT ROLLS A MINIMUM OF 3 INCHES. PIN AT 1 FOOT INTERVALS, BACKFILL, AND
COMPACT. UNROLL THE RECP IN THE UPSTREAM DIRECTION UNTIL REACHING THE FIRST
INTERMITTENT TRENCH. FOLD THE RECP BACK OVER ITSELF, POSITIONING THE ROLL ON
THE DOWNSTREAM SIDE OF THE TRENCH, AND ALLOWING THE MAT TO CONFORM TO THE
TRENCH.
THEN PIN THE RECP (TWO LAYERS) TO THE BOTTOM OF THE TRENCH, BACKFILL, AND
COMPACT. CONTINUE UP THE CHANNEL (WRAPPING OVER THE TOP OF THE INTERMITTENT
trench) REPEATING THIS STEP AT OTHER INTERMITTENT TRENCHES, UNTIL REACHING THE
UPPER TERMINAL TRENCH.
AT THE UPPER TERMINAL TRENCH, ALLOW THE RECP TO CONFORM TO THE TRENCH,
SECURE WITH PINS OR STAPLES, BACKFILL, COMPACT AND THEN BRING THE MAT BACK
OVER THE TOP OF THE TRENCH AND ONTO THE EXISTING MAT (2 TO 3 FEET OVERLAP IN THE
DOWNSTREAM DIRECTION), AND PIN AT 1 FOOT INTERVALS ACROSS THE RECP. WHEN
STARTING INSTALLATION OF A NEW ROLL, BEGIN IN A TRENCH OR SHINGLE -LAP ENDS OF ROLLS
A MINIMUM OF 1 FOOT WITH UPSTREAM RECP ON TOP TO PREVENT UPLIFTING. PLACE
THE OUTSIDE EDGES OF THE RECP(S) IN LONGITUDINAL TRENCHES, PIN, BACKFILL, AND
COMPACT.
Contents
100%Wheat Straw
Netting
Single Polypropylene (rapid photodegradable)
Thread
Nylon Photodegradable
Standard Width
8 feet / 2.44 meters (actual 8' width)
Standard Length
113 feet/ 34.44 meters
Area
100 yd' / 83.6 ml
Weight (Approx)
52 lbs./23.6 kg (0.53 lbs./yd2)
Life
Medium Term, Approx. 3 Months
Best Use
3:1 or Less Low Flow Roadside Use
Thread Spacing
11/2 inches
MAINTENANCE REQUIREMENTS:
1. INSPECT ROLLED EROSION CONTROL PRODUCTS AT LEAST WEEKLY AND AFTER EACH
SIGNIFICANT (1/2 INCH OR GREATER) RAIN FALL EVENT REPAIR IMMEDIATELY.
2. GOOD CONTACT WITH THE GROUND MUST BE MAINTAINED, AND EROSION MUST NOT
OCCUR BENEATH THE RECP.
3. ANY AREAS OF THE RECP THAT ARE DAMAGED OR NOT IN CLOSE CONTACT WITH THE
GROUND SHALL BE REPAIRED AND STAPLED.
4. IF EROSION OCCURS DUE TO POORLY CONTROLLED DRAINAGE, THE PROBLEM SHALL BE
FIXED AND THE ERODED AREA PROTECTED.
5. MONITOR AND REPAIR THE RECP AS NECESSARY UNTIL GROUND COVER IS
ESTABLISHED
TEMPORARY DIVERSION DITCH AND LINER DETAILS
NOTES:
1. L = THE LENGTH OF THE
RIPRAP
° APRON.
2. d = 1.5 TIMES THE MAXIMUM STONE
A
A DIAMETER BUT NOT
,, LESS THAN 6" (INCHES).
PIPE // 3. A FILTER BLANKET OR FILTER
I.D.
FABRIC SHOULD BE
INSTALLED BETWEEN THE
0
RIPRAP
W1
W2 AND SOIL FOUNDATION.
(3 TIMES I.D.)
PLAN VIEW
a L
PIPE
-�------------
�I ll�lJl� I lll� I I �I I
1LllI d
I-
_,1 J,111= IIU1IIII
FILTER
FABRIC
SECTION 'A -A'
STANDARD PIPE OUTLET ENERGY DISSIPATER
CONSTRUCTION SPECIFICATIONS
1. ENSURE THAT THE SUBGRADE FOR THE FILTER AND RIPRAP FOLLOWS THE REQUIRED LINES
AND GRADES SHOWN IN THE PLAN. COMPACT ANY FILL REQUIRED IN THE SUBGRADE TO THE
DENSITY OF THE SURROUNDING UNDISTURBED MATERIAL. LOW AREAS IN THE SUBGRADE ON
UNDISTURBED SOIL MAY ALSO BE FILLED BY INCREASING THE RIPRAP THICKNESS.
2. THE RIPRAP AND GRAVEL FILTER MUST CONFORM TO THE SPECIFIED GRADING LIMITS
SHOWN ON THE PLANS.
3. FILTER CLOTH, WHEN USED, MUST MEET DESIGN REQUIREMENTS AND BE PROPERLY
PROTECTED FROM PUNCHING OR TEARING DURING INSTALLATION. REPAIR ANY DAMAGE BY
REMOVING THE RIPRAP AND PLACING ANOTHER PIECE OF FILTER CLOTH OVER THE DAMAGED
AREA. ALL CONNECTING JOINTS SHOULD OVERLAP SO THE TOP LAYER IS ABOVE THE
DOWNSTREAM LAYER A MINIMUM OF 1 FOOT. IF THE DAMAGE IS EXTENSIVE, REPLACE
THE ENTIRE FILTER CLOTH.
4. RIPRAP MAY BE PLACED BY EQUIPMENT, BUT TAKE CARE TO AVOID DAMAGING THE
FILTER.
5. THE MINIMUM THICKNESS OF THE RIPRAP SHOULD BE 1.5 TIMES THE MAXIMUM
STONE DIAMETER.
6. RIPRAP MAY BE FIELD STONE OR ROUGH QUARRY STONE. IT SHOULD BE HARD,
ANGULAR, HIGHLY WEATHER -RESISTANT AND WELL GRADED.
7. CONSTRUCT THE APRON ON ZERO GRADE WITH NO OVERFILL AT THE END. MAKE THE
TOP OF THE RIPRAP AT THE DOWNSTREAM END LEVEL WITH THE RECEIVING AREA OR SLIGHTLY
BELOW IT.
8. ENSURE THAT THE APRON IS PROPERLY ALIGNED WITH THE RECEIVING STREAM
AND PREFERABLY STRAIGHT THROUGHOUT ITS LENGTH. IF A CURVE IS NEEDED TO FIT SITE
CONDITIONS, PLACE IT IN THE UPPER SECTION OF THE APRON.
9. IMMEDIATELY AFTER CONSTRUCTION,STABILIZE ALL DISTURBED AREAS WITH VEGETATION
MAINTENANCE REQUIREMENTS:
INSPECT RIPRAP OUTLET STRUCTURES WEEKLY AND AFTER SIGNIFICANT (1/2 INCH OR GREATER)
RAINFALL EVENTS TO SEE IF ANY EROSION AROUND OR BELOW THE RIPRAP HAS TAKEN PLACE,
OR IF STONES HAVE BEEN DISLODGED. IMMEDIATELY MAKE ALL NEEDED REPAIRS TO
PREVENT FURTHER DAMAGE.
2 W1
W2
d
MAXIMUM
LOCATION
VELOCITY
DESIGN
Q
OUTLET PIPE
d50
APRON
APRON WIDTH
APRON WIDTH
STONE
APRON
STORM
DIAMETER
LENGTH
AT PIPE OUTLET
AT OUTLET END
DIAMETER
THICKNESS
(fps)
(cfs)
(in)
(in)
(ft)
(ft)
(ft)
(in)
(in)
outlet of slope drain into basin #1
13.2
10 YR
20.58
30
12
15
7.5
17.5
18
27
outlet of slope drain into basin #2
11.4
10 YR
20.58
24
10
12
6.0
14.0
15
22.5
outlet of slope drain into basin #3(west)
13.2
25 YR
23.75
30
12
15
7.5
17.5
18
27
outlet of slope drain into basin #3(east)
8.3
25 YR
4.50
15
6
8
3.8
9.3
9
13.5
outlet of slope drain into basin #4(west)
11.4
25 YR
43.00
(2)24
10
15
12.0
18.0
15
22.5
outlet of slope drain into basin #4(north)
12.4
25 YR
9.01
18
6
6
4.5
7.5
15
22.5
outlet of slope drain into basin #5(south)
8.3
10 YR
0.36
15
6
6
3.8
7.3
9
13.5
outlet of slope drain into basin #5(north)
8.3
10 YR
0.36
15
6
6
3.8
7.3
9
13.5
outlet of slope drain into basin #6(south)
8.3
10 YR
0.36
15
6
6
3.8
7.3
9
13.5
outlet of slope drain into basin #6(north)
8.3
10 YR
1.08
15
6
6
3.8
7.3
9
13.5
outlet of slope drain into basin #7(south)
8.3
10 YR
1.81
15
6
6
3.8
7.3
9
13.5
outlet of slope drain into basin #7(north)
8.3
10 YR
2.53
15
6
6
3.8
7.3
9
13.5
Pipe #1 (permanent pipe under berm)
9.3
10 YR
11.26
15
6
10
3.8
11.3
9
13.5
Pipe #2 (permanent pipe under berm)
5.7
10 YR
5.77
15
6
6
3.8
7.3
9
13.5
Pipe #3 (permanent pipe under entrance)
2.10
10 YR
0.29
15
6
6
3.8
7.3
9
13.5
ENERGY
DISSIPATER DETAILS
8522-204 SIX FORKS ROAD
RALEIGH, NORTH CAROLINA 27615
919.845.7600 PHONE
919.845.7703 FAX
ENGR. FIRM LICENSE #F-0843
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I SSU ED: 16 MAR 2020
REV I SI ON S:
AO 30 SEP 2020
PER NCDEQ COMMENTS
&2 05 MAR 2021
PER NCDEQ COMMENTS
DRAWN BY: MILS
CHECKED BY: MILS
PROJECT: WSRDUQ
DETAILS
DWG. NO. SITE 11

STEEL POSTS (QUANTITY VAR.)
PLASTIC SLOPE DRAIN PIPE
(PRACTICE STANDARD 6.32)
OR
GEOTEXTILE LINING
TEMPORARY OR .
PERMANENT DITCH
COIR FIBER BAFFLES -
(PRACTICE STANDARD 6.65)
PLAN VIEW
RISER STRUCTURE
TRASH RACK
SKIMMER
V,ri_iiiMimi
CLASS B STONE PAD
(4' X 4' X 1' MIN.) ANTIFLOTATION BLOCK
4' x 4' x 12" THICK MINIMUM
SKIMMER (SIZE VAR.)
STONE PAD -
(below skimmer)
Za7Za]2:1ul L1011:1u1:11101kI
.' M1N.
FREEBOARD -
1' MIN. _
RISER STRUCTURE
/EMBANKMENT
r
STONE ENERGY
- DISSIPATOR
EMERGENCY SPILLWAY
WOOD STAKE
OR METAL POST
SECTIONAL VIEW CUTOFF
TRENCH
2' DEEP
1.1
ANTI -SEEP
COLLAR
EMERGENCY SPILLWAY
LINE SPILLWAY WITH CLASS B RIP RAP FOR
THE ENTIRE WIDTH OF THE SPILLWAY, AND
ALONG THE ENTIRE INTERIOR AND EXTERIOR
SLOPE. PROVIDE AN IMPERMEABLE TARP
UNDER THE EXTENTS OF THE RIP RAP AREA.
NOTES
1. SEED AND PLACE MATTING FOR EROSION CONTROL ON INTERIOR AND EXTERIOR SIDESLOPES.
2. INSTALL A MINIMUM OF 3 COIR FIBER BAFFLES IN ACCORDANCE WITH PRACTICE STANDARD 6.65.
3. INSTALL SKIMMER AND COUPLING TO RISER STRUCTURE OR DIRECTLY INTO EMBANKMENT 1 FT. FROM BOTTOM OF BASIN.
4. THE ARM PIPE SHALL HAVE A MINIMUM LENGTH OF 6 FT. BETWEEN THE SKIMMER AND COUPLING.
BARREL
4- PIPE
STABILIZED
OUTLET
NOT TO SCALE
CONSTRUCTION SPECIFICATIONS
1. Site preparations- Clear, grub, and strip topsoil from areas under the
embankment to remove trees, vegetation, roots, and other objectionable material.
Delay clearing the pool area until the dam is complete and then remove brush,
trees, and other objectionable materials to facilitate sediment cleanout. Stockpile
all topsoil or soil containing organic matter for use on the outer shell of the
embankment to facilitate vegetative establishment. Place temporary sediment
control measures below the basin as needed.
2. Cut-off trench- Excavate a cut-off trench along the center line of the earth fill
embankment. Cut the trench to stable soil material, but in no case make it less
than 2 feet deep. The cut-off trench must extend into both abutments to at least
the elevation of the riser crest. Make the minimum bottom width wide enough to
permit operation of excavation and compaction equipment, but in no case less
than 2 feet. Make side slopes of the trench no steeper than 1: 1. Compaction
requirements are the same as those for the embankment. Keep the trench dry
during backfilling and compaction operations.
Place a minimum depth of 2 feet of compacted backfill over the pipe spillway
before crossing it with construction equipment. Anchor the riser in place by
concrete or other satisfactory means to prevent flotation. In no case should the
pipe conduit be installed by cutting a trench through the dam after the
embankment is complete.
5. Emergency spillway- Install the emergency spillway in undisturbed soil. The
achievement of planned elevations, grade, design width, and entrance and exit
channel slopes are critical to the successful operation of the emergency spillway.
6. Inlets- Discharge water into the basin in a manner to prevent erosion. Use
diversions with outlet protection to divert sediment -laden water to the upper end
of the pool area to improve basin trap efficiency (References: Runoff Control
Measures and Outlet Protection),
7. Erosion control- Construct the structure so that the disturbed area is
minimized. Divert surface water away from bare areas. Complete the
3. Embankment- Take fill material from the approved areas shown on the plans. embankment before the area is cleared. Stabilize the emergency spillway
It should be clean mineral soil, free of roots, woody vegetation, rocks, and other embankment and all other disturbed areas above the crest of the principal
objectionable material. Scarify areas on which fill is to be placed before placing fill. spillway immediately after construction (References: Surface Stabilization).
The fill material must contain sufficient moisture so it can be formed by hand
into a ball without crumbling. If water can be squeezed out of the ball, it is too 8• Install porous baffles as specified in Practice 6.65, Porous Baffles.
wet for proper compaction. Place fill material in 6 to S inch continuous layers
over the entire length of the fill area and compact it. Compaction may be
obtained by routing the construction hauling equipment over the fill so that the
entire surface of each layer is traversed by at least one wheel or tread track of
heavy equipment, or a compactor may be used. Construct the embankment to an
elevation 10 percent higher than the design height to allow for settling.
4. Conduit spillways- Securely attach the riser to the barrel or barrel stub to
make a watertight structural connection. Secure all connections between barrel
sections by approved watertight assemblies. Place the barrel and riser on a firm,
smooth foundation of impervious soil. Do not use pervious material such as
sand, gravel, or crushed stone as backfill around the pipe or anti -seep collars.
Place the fill material around the pipe spillway in 4-inch layers, and compact it
under and around the pipe to at least the same density as the adjacent
embankment. Care must be taken not to raise the pipe from firm contact
with its foundation when compacting under the pipe haunches.
9. Safety- Sediment basins may attract children and can be dangerous. Avoid
steep side slopes, and fence and mark basins with warning signs if trespassing is
likely. Follow all state and local requirements.
MAINTENANCE REQUIREMENTS:
Inspect temporary sediment basins at least weekly and after each significant (112
inch or greater) rainfall event and repair immediately. Remove sediment and
restore the basin to its original dimensions when it accumulates to one-half the
design depth. Place removed sediment in an area with sediment controls.
If maintenance or removal of basin requires dewatering, water will either be
pumped through silt bags as detailed or pumped to one or both quarry pits.
Check the embankment, spillways, and outlet for erosion damage, and inspect the
embankment for piping and settlement. Make all necessary repairs immediately.
Remove all trash and other debris from the riser and pool area.
BASIN
DA
C
DESIGN
INTENSITY
TIME OF
Q
REQUIRED
REQUIRED
MIN
MIN
DEPTH
PROVIDED
PROVIDED
SIDE
DAM
DAM
EMERGENCY
BARRELL
BARRELL
SKIMMER
SKIMMER
DEWATERING
STORM
CONCENTRATION
SA
VOLUME
L
W
SA
VOLUME
SLOPES
HEIGHT
WIDTH
SPILLWAY
DIAMETER
LENGTH
SIZE
ORIFICE
TIME
WIDTH
TYPE
(Acres)
("/hr)
(min)
(cfs)
(sf)
(cf)
(ft)
(ft)
(ft)
(sf)
(cf)
(ft)
(ft)
(ft)
(in)
(ft)
(in)
(in)
(days)
4
40.0
0.50
25-yr
8.19
5.00
163.80
71,253
72,000
SEE PLAN
2
72,685
137,511
2.5:1
5
18
85
36
60.00
5.00
4.30
3
RISER BASIN
F' x 1' THICK
B STONE PAD
SKIMMER
18' MIN
TOP OF DAM
TARP PROTECTION
DITCH AND BURY TARP
EDGE (MIN. 12')
o' MIN
(IMPERMEABLE LINER)
WEIR LENGTH
CY SECTI❑N THRU WEIR
�Y
YYVVU JIMRG VR
METAL POST
1' MIN FREEBOARD TOP OF BERM
BAFFLES (STD)
INFLOW
RUCTURE
/
EMERGENCY
SPILLWAY
SKIMMER - ELEVATION
DEWZONEATERIN
I
DISSIPATER
PAD
RIP RAP
INLET SHALL BE CMP OUTLET PI
PROTECTED (AS NEEDED) CROSS SECTION
FROM ER❑SI❑N WITH
RIPRAP, TARP, MATTING
OR EQUIVALENT,
NOTES:
1) BASIN SHOULD BE CLEANED OUT WHEN CAPACITY REACHES AN ELEVATION REPRESENTING THAT THE BASIN IS HALF -FULL.
2) THE TARP USED TO PROTECT THE WEIR SHALL BE THE WIDTH SPECIFIED. THE LENGTH OF THE TARP SHALL BE ACCORDING
TO AVAILABLE SUPPLY. IF MULTIPLE TARPS ARE TO BE USED, THEN TARPS SHALL BE OVERLAPPED AT LEAST 12". THE
UPSTREAM 12" TARP SHALL OVERLAP THE DOWNSTREAM TARP. THE TARP SHALL BE 50 MIL. HEAVY DUTY SILVER TARPAULINS
OR EQUIVALENT FOR U.V. RESISTANCE.
3) PROVIDE A MINIMUM OF THREE POROUS BAFFLES TO EVENLY DISTRIBUTE FLOW ACROSS THE BASIN, REDUCING TURBULENCE.
4) BAFFLE MATERIAL MUST BE SECURED AT THE BOTTOM AND SIDES USING STAPLES OR BY TRENCHING AS FOR A SILT FENCE.
5) MOST OF THE SEDIMENT WILL ACCUMULATE IN THE FIRST BAY, SO THIS SHOULD BE READILY AVAILABLE FOR MAINTENANCE.
6) DURING THE CONSTRUCTION PHASE OF THE PROJECT, PERMANENT STORMWATER RISER SHALL ONLY DEWATER FROM THE TOP OF
7) POND SHALL NOT BE CONVERTED FOR STORMWATER USE UNTIL APPROVED BY ENVIRONMENTAL ENGINEER.
STANDARD SKIMMER BASIN
OUTLET END, CONNECTION
TO OUTLET PIPE OR RISER
SKIMMER BASIN DETAIL
RISER BASIN DESIGN DATA
STANDARD SKIMMER DETAIL
DOOR
4T
CONSTRUCTION SPECIFICATIONS
1. Clear, grub, and strip the area under the embankment of all vegetation and
root mat. Remove all surface soil containing high amounts of organic matter
and stockpile or dispose of it properly. Haul all objectionable material to the
designated disposal area. Place temporary sediment control measures below
basin as needed
2. Ensure that fill material for the embankment is free of roots, woody
vegetation, organic matter, and other objectionable material. Place the fill in
lifts not to exceed 9 inches, and machine compact it. Over fill the embankment
6 inches to allow for settlement.
3. Shape the basin to the specified dimensions. Prevent the skimming device
from settling into the mud by excavating a shallow pit under the skimmer or
providing a low support under the skimmer of stone or timber.
4. Place the barrel (typically 4-inch Schedule 40 PVC pipe) on a firm, smooth
foundation of impervious soil. Do not use pervious material such as sand,
gravel, or crushed stone as backfill around the pipe. Place the fill material
around the pipe spillway in 4-inch layers and compact it under and around
the pipe to at least the same density as the adjacent embankment. Care must
be taken not to raise the pipe from the firm contact with its foundation when
compacting under the pipe haunches.
Place a minimum depth of 2 feet of compacted backfill over the pipe spillway
before crossing it with construction equipment. In no case should the pipe
conduit be installed by cutting a trench through the dam after the embankment
is complete.
5. Assemble the skimmer following the manufacturers instructions, or as
designed.
6. Lay the assembled skimmer on the bottom of the basin with the flexible
joint at the inlet of the barrel pipe. Attach the flexible joint to the barrel pipe
and position the skimmer over the excavated pit or support. Be sure to attach
a rope to the skimmer and anchor it to the side of the basin. This will be used
to pull the skimmer to the side for maintenance.
7. Earthen spillways -Install the spillway in undisturbed soil to the greatest
extent possible. The achievement of planned elevations, grade, design width,
and entrance and exit channel slopes are critical to the successful operation
of the spillway. The spillway should be lined with laminated plastic or
impermeable geotextile fabric. The fabric must be wide and long enough to
cover the bottom and sides and extend onto the top of the dam for anchoring
in a trench. The edges may be secured with 8-inch staples or pins. The fabric
must be long enough to extend down the slope and exit onto stable ground.
The width of the fabric must be one piece, not joined or spliced; otherwise
water can get under the fabric. If the length of the fabric is insufficient for the
entire length of the spillway, multiple sections, spanning the complete width,
may be used. The upper section(s) should overlap the lower section(s) so
that water cannot flow under the fabric. Secure the upper edge and sides
of the fabric in a trench with staples or pins. (Adapted from "A Manual for
Designing, Installing and Maintaining Skimmer Sediment Basins." February,
1999. J. W. Faircloth & Son.).
8. Inlets -Discharge water into the basin in a manner to prevent erosion. Use
temporary slope drains or diversions with outlet protection to divert sediment -
laden water to the upper end of the pool area to improve basin trap efficiency
(References: Runoff Control Measures and Outlet Protection).
9. Erosion control -Construct the structure so that the disturbed area is
minimized. Divert surface water away from bare areas. Complete the
embankment before the area is cleared. Stabilize the emergency spillway
embankment and all other disturbed areas above the crest of the principal
spillway immediately after construction (References: Surface Stabilization).
10. Install porous baffles as specified in Practice 6.65, Porous Baffles.
11. After all the sediment -producing areas have been permanently stabilized,
remove the structure and all the unstable sediment. Smooth the area to
blend with the adjoining areas and stabilize properly (References: Surface
Stabilization).
MAINTENANCE REQUIREMENTS:
Inspect skimmer sediment basins at least weekly and after each significant
(one-half inch or greater) rainfall event and repair immediately. Remove
sediment and restore the basin to its original dimensions when sediment
accumulates to one-half the height of the first baffle. Pull the skimmer to
one side so that the sediment underneath it can be excavated. Excavate the
sediment from the entire basin, not just around the skimmer or the first cell.
Make sure vegetation growing in the bottom of the basin does not hold down
the skimmer.
If maintenance or removal of basin requires dewatering, water will either be
pumped through silt bags as detailed or pumped to one or both quarry pits.
Repair the baffles if they are damaged. Re -anchor the baffles if water is
flowing underneath or around them.
If the skimmer is clogged with trash and there is water in the basin, usually
jerking on the rope will make the skimmer bob up and down and dislodge
the debris and restore flow. If this does not work, pull the skimmer over to
the side of the basin and remove the debris. Also check the orifice inside the
skimmer to see if it is clogged; if so remove the debris.
If the skimmer arm or barrel pipe is clogged, the orifice can be removed and
the obstruction cleared with a plumber's snake or by flushing with water. Be
sure and replace the orifice before repositioning the skimmer.
Check the fabric lined spillway for damage and make any required repairs
with fabric that spans the full width of the spillway. Check the embankment,
spillways, and outlet for erosion damage, and inspect the embankment for
piping and settlement. Make all necessary repairs immediately. Remove all
trash and other debris from the skimmer and pool areas.
Freezing weather can result in ice forming in the basin. Some special
precautions should be taken in the winter to prevent the skimmer from
plugging with ice.
BASIN
DA
(Acres)
C
DESIGN
STORM
INTENSITY
("/hr)
TIME OF
CONCENTRATION
(min)
Q
(cfs)
REQUIRED
SA
(sf)
REQUIRED
VOLUME
(cf)
MIN
L
(ft)
MIN
W
(ft)
DEPTH
(ft)
PROVIDED
SA
(sf)
PROVIDED
VOLUME
(cf)
SIDE
SLOPES
DAM
HEIGHT
(ft)
DAM
WIDTH
(ft)
EMERGENCY
SPILLWAY
WIDTH
(ft)
SKIMMER
SIZE
(in)
SKIMMER
ORIFICE
(in)
DEWATERING
TIME
(days)
EXPECTED
DURATION OF USE
TYPE
1
5.7
0.50
10-yr
7,22
5.00
20.58
61688
10,260
120
60
2
71114
12,882
2:1
4
5
20
2.50
1.90
3
LESS THAN 1 YEAR
SKIMMER SEDIMENT BASIN
2
5.7
0.50
10-yr
7,22
5.00
20.58
61688
10,260
120
60
2
71114
12,882
2:1
4
5
20
2.50
1.90
3
LESS THAN 1 YEAR
SKIMMER SEDIMENT BASIN
3
8.0
0.50
25-yr
8.19
5.00
32.76
10,647
141400
155
70
2
10,764
19,874
2:1
4
5
13
2.50
2.20
3
GREATER THAN 1 YEAR
SKIMMER SEDIMENT BASIN
5
0.8
0.50
10-yr
7.22
5.00
2.89
939
11440
46
29
2
11334
21084
2:1
4
5
10
1.50
0.80
3
LESS THAN 1 YEAR
SKIMMER SEDIMENT BASIN
6
1.3
0.50
10-yr
7.22
5.00
4.69
11525
21340
77
28
2
2,067
31388
2:1
4
5
10
1.50
1.00
3
LESS THAN 1 YEAR
SKIMMER SEDIMENT BASIN
7
1.7
0.50
10-yr
7.22
5.00
6.14
11995
3,060
77
36
2
21683
41582
2:1
4
5
10
1.50
1.20
3
LESS THAN 1 YEAR
SKIMMER SEDIMENT BASIN
RMWTAEOB@�UP
8522-204 SIX FORKS ROAD
RALEIGH, NORTH CAROLINA 27615
919.845.7600 PHONE
919.845.7703 FAX
ENGR. FIRM LICENSE #F-0843
Q
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I SSU ED: 16 MAR 2020
REV I SI ON S:
10 30 SEP 2020
PER NCDEQ COMMENTS
02 05 MAR 2021
PER NCDEQ COMMENTS
DRAWN BY: MLS
CHECKED BY: MLS
PROJECT: WSRDUQ
DETAILS
SKIMMER SEDIMENT BASIN DESIGN DATA