C502 EC details_20200123

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6.10 DEFINmON: POROUS BARRIERS INSTALLED INSIDE A TEMPORARY SEDIMENT TRAP, SKIMMER BASIN, OR SEDIMENT BASIN TO REDUCE I 4'MAx
THE VELOCITY AND TURBULENCE OF THE WATER FLOWING THROUGH THE MEASURE, AND TO FACILITATE THE SEITUNG OF SEDIMENT LZI 3 LaBeRa
MCCE=
Temporary Seeding Species Rate (lb/acre)Table 6.10a Seeding mixture FROM THE WATER BEFORE DISCHARGE. STEEL POST
POW2P@d by partnership.
PURPOSE: SEDIMENT TRAPS AND BASINS ARE DESIGNED TO TEMPORARILY POOL RUNOFF WATER TO ALLOW SEDIMENT TO SETTLE CLA55I OR 2 RIP-RAP Will THd
Recommendations for Late BEFORE THE WATER IS DISCHARGED. UNFORTUNATELY, THEY ARE USUALLY NOT VERY EFFICIENT DUE TO HIGH TURBULENCE AND WIRE FENCING INCHES OF WASHED STONE ON
TS Rye (grain) 120 "SHORT-CIRCUITING" FLOWS WHICH TAKE RUNOFF QUICKLY TO THE OUTLET WITH LITTLE INTERACTION WITH MOST OF THE BASIN. OFAPPLACABLE) UPSTREAM FACE
Definition Planting rapid-growing annual grasses, small grains, or legumes to provide Winter and Early Spring Annual lespedeza (Kobe in POROUS BAFFLES IMPROVE THE RATE OF SEDIMENT RETENTION BY DISTRIBUTING THE FLOW AND REDUCING TURBULENCE. THIS IIIIIIIIIII . , Ill615 St. George Square
initial,temporary cover for erosion control on disturbed areas. Piedmont and Coastal Plain, PROCESS CAN IMPROVE SEDIMENT RETENTION. Suite 300
Korean in Mountains) 50WOVEN HLRI
CONDITIONS TEMPORARY
WHERE PRACTICE APPLIES; THIS PRACTICE SHOULD BE USED IN ANY TEMPORARY SEDIMENT TRAP, SKIMMER BASIN, OR FABRIC v Winston-Salem, N C 27103
TEMPORARY SEDIMENT BASIN.
Purpose To temporarily stabilize denuded areas that will not be brought to final grade Omit annual n r les edeza when duration of temporary cover is not to 336-842-4065
fora period of more than 21. calendar days. p P ry PLANNING CONSIDERATIONS: POROUS BAFFLES EFFECTIVELY SPREAD THE FLOW ACROSS THE ENTIRE WIDTH OF A SEDIMENT BASIN extend beyond June. TRAP. WRIER FLOWS THROUGH THE BAFFLE MATERIAL., BUT IS SLOWED SUFFICIENTLY TO BACK UP THE FLOW, CAUSING IT TO SPREAEk
D C#0430
ACROSS THE ENTIRE WIDTH OF THE BAFFLE. SPREADING THE FLOW IN THIS MANNER UTILIZES THE FULL CROSS SECTION OF THE STEEL POST
Temporary seeding controls runoff and erosion until permanent vegetation or BASIN, WHICH IN TURN REDUCES FLOW RATES OR VELOCITY AS MUCH AS POSSIBLE. IN ADDITION, THE TURBULENCE IS ALSO la b e I I a p C.C 0 m
Seeding dates GREATLY REDUCED. THIS COMBINATION INCREASES SEDIMENT DEPOSITION AND RETENTION AND ALSO DECREASES THE PARTICLE SIZE GENERAL NOTES MANIENANCENOTES: cAssloR2 I'MIN WASHED STONE
other erosion Control measures can be established. In addition, It provides 1. SEDIMENT FILTER OUTLET SHALL BE 16 INCHES HIGH OM NO 1, FILTER WILET85HALL BE INSPECTED BY THE FINANCIALLY
residue for soil `election and seedbed reparation, and reduces problems of Mountains-Above 2500 feet: Feb. 15- May 15 OF SEDIMENT CAPTURED. THE INSTALLATION SHOULD BE SIMILAR TO A SEDIMENT FENCE. THE FABRIC SHOULD BE 700 G/M2 COIR TALLERTHANIBINCHE3 RESPONSIBLE PARTYOR HIS AGENT IMMEDIAULYAFTER RIP-RAP (NCDOT N5 OR N57)
P preparation, P EROSION BLANKET OR EQUAL A SUPPORT WIRE ACROSS THE TOP WILL HELP PREVENT EXCESSIVE SAGGING IF THE MATERIAL IS EACH RAINFALL AND AT LEASTOALYOURING PROLONGED ry. ?�
Below 2500 feet: Feb. 1- May 1 ATTACHED TO IT WITH APPROPRIATE TIES. 2, CLASS OR 2 RIP-RAP SNAIL BE USED AND COVEREDNPITH RAINFALL.ANY REPAIRS NEEDED SHALL BE MADE Ow,
litud and dust production from bare SOLI surfaces during construction, Piedmont-Jan. 1 - May 1 61NCHES OF NCOOT 05 OR*57 WASHED STONE ON THE IMMEDIATELY,
UPSLOPE SIDE 111
IYAMER ANYI- 1 ! -II-
Coastal Plain-Dec. 1 -Apr. 15 DESIGN CRITERIA THE DESIGN CRFTERIA. THE PERCENT OFOFESURFNACE AREA FOR TRAP OR MEACH SECTION OF 1H SEDIMENT HEEINBAFFLE IS AS FOLLOWS BE SIZED : 3.
THE APPROPRIATE 3, POSTS SHALL BE NO MORE THAN4FEETAPART. 2 �NTTHATRASCLOGGED RREMOVE It. I ,%%",NCAh�<zizz I
Conditions Where On any cleared, unvegetated, or sparsely vegetated soil surface where * INLET ZONE - 25% !�t •°• • •
Soil amendments * FIRST CELL - 25% 4. SITE DURE75ATAN PoINTSMALCONCENOA CONCENTRATED 3. SEDIMEMOEPoSRSSHOUDBEREMO BANNED O. �gSS/
Vegetative cover 1s needed for less than I year. Applications Of this practice * ARE ANTICIPATED AND AT THE DIRECTION OF THE DEPOSITS REACH HALF THE HEIGHT OF THE BARRIER ANY paw_-4-j��
ti•' *Practice Applies Follow recommendations of soil tests or apply 2,000 Ib/acre ground SECOND CELL - 25% INSPECTOR. SEDIMENT DEPOSITS REMAINING IN PLACE AFTER THE SILT V1include(iiversions, dais, temporary sediment basins-, temporary road banks. * OUTLET ZONE - 25% FENCE OUTET IS REMOVED SHAL BE DRESSED TOSal7d t0 SOLI SLOCk lies. agricultural limestone and 750 lb/acre 10-10-10 fertilizer. 5. ONE ACRE MM14UM DRANAGE AREA PER DOM. CONFORM TONE EXISTING GRACE,PREPARED AND -
F P BAFFLE SPACING IN FUTURE PERMANENT STORMWATER BASINS IS BEYOND FOREBAY. BE SURE TO CONSTRUCT BAFFLES UP THE SEEDED. 1. 22102
Mulch SIDES OF THE TRAP OR BASIN BANKS SO WATER DOES NOT FLOW AROUND THE STRUCTURES. MOST OF THE SEDIMENT WILL BE -
Y g p g CAPTURED IN THE INLET ZONE. SMALLER PARTICLE SIZE SEDIMENTS ARE CAPTURED IN THE LATTER CELLS. BE SURE TO MAINTAIN CX .°
Apply 4,000 lb/acre straw. Anchor straw b tacking with asphalt,netting,
Annual plants,which Sprout and row rapidly and survive for only one season. ACCESS TO THE TRAP FCR MAINTENANCE AND SEDIMENT REMOVAL THE DESIGN LIFE OF THE FABRIC IS 6-12 MONTHS, BUT MAY Ii 'O'. h"GINSS .. ��
Planning P 1 g P Y` Y or a mulch anchoring tool. A disk with blades set nearly straight can be NEED TO BE REPLACED MORE OFTEN IF DAMAGED OR CLOGGED. _ 74 0�\�
are suitable for establishing initial or temporary vegetative cover. Temporary z4 ��IA.STIMe�' xx
Considerations seeding preserves the integrity of earthen sediment control structures such used as a mulch anchoring tool. CONSTRUCTION SPECIFICATIONS ( 7 }SILT FENCE STONE OUTLET 4// / x"
MATERIALS } C502 111111
as dikes,diversions, and the banks of dams and sediment basins. It can also Maintenance 1. USE MATTING MADE OF 100% COCONUT FIBER (COIR) TWINE WOVEN INTO HIGH STRENGTH MATRIX WITH THE PROPERTIES SHOWN - - LL
reduce the amount of maintenance associated with these devices. For example, Refertilize if growth is not fully adequate. Reseed, refertilize and mulch IN THE TABLE BELOW. - / j
the frequency of sediment basin cleanouts will be reduced if watershed areas, immediately following erosion or Other damage. 2. STAPLES SHOULD BE MADE OF 0.125 INCH DIAMETER NEW STEEL WIRE FORMED INTO A 'Ur SHAPE NOT LESS THAN 12 INCHES
IN LENGTH WITH A THROAT OF 1 INCH IN WIDTH. THE STAPLES ANCHOR THE POROUS BAFFLES INTO THE SIDES AND BOTTOM FL=W N 4UFIHAAn IMl
outside the active construction zone, are stabilized. OF THE BASIN. I1,. n'1`e.1r"m Analw tK ii°,
3. ENSURE THAT STEEL POSTS FOR POROUS BAFFLES ARE OF A SUFFICIENT HEIGHT TO SUPPORT BAFFLES AT DESIRED HEIGHT. T
Propel'seedbed preparation,selection ofappropriate species,and useOfquality POSTS SHOULD BE APPROXIMATELY 1-3/8' WIDE MEASURED PARALLEL TO THE FENCE, AND HAVE A MINIMUM WEIGHT OF 1.25
seed arc as important in this Practice as in Practice(i.l 1,Permanent Seeding. LB/LINEAR FT. THE POSTS MUST BE EQUIPPED WITH AN ANCHOR PLATE HAVING A MINIMUM AREA OF 14.0 SQUARE INCHES ANDTP'm HAIwu amx No°f 1�ia�wAl i
BE OF THE SELF-FASTENER ANGLE STEEL TYPE TO HAVE A MEANS OF RETAINING WIRE AND COIR FIBER MAT IN THE DESIRED THEE lmo ax S
Failure to follow established guidelines and recommendations carefully may Table 6.10b Seeding mixture POSITION WITHOUT EMPLACEMENT. lill"PlISAM)MCIN i"' INLET I
ll
result in an inadequate or short-lived stand of vegetation that will not control Temporary Seeding Species Rate (lb/acre) 4. USE 9-GAUGE HIGH TENSION WIRE FOR SUPPORT WIRE. 11 #I ,I, i
erosion. Recommendations for German millet 40 ab k(�ifll)'Ili(ijs,,,iII'lI ti�
� sd1i t33ti gNiif(t 7!ira `I1�3� .:� 'f 1 ###j
Temporaryseeding provides rotectionfor no more than l ear,during which Summer COIR FIBER BAFFLE MATERIAL PROPERTY REQUIREMENTS , i�
time permanent stabilization should be initiated. In the Piedmont and Mountains, a small-stemmed Sudangrass may be `- (lml #€I 1 t
substituted at a rate of 50 lb/acre. THICKNESS 0.30 IN. MINIMUM SECTION H � PtLAN� I�mwm III
Complete grading beforepreparing seedbeds,and install ill necessary erosion Seeding dates TENSILE STRENGTH WET 90OX680 LB FT MINIMUM
Specifications I 6a a Mountains-Ma 155 (WET)
/ J
control practicesrhe`ices"chas,
dbed preparation
waterways,difficult
M crease steep slopesy -Aug.g ELONGATION (WET) 69% X 34% MAXIMUM 6 - #57 WASHED STONE & WIRE INLET PROTECTION
because they make seedbed preparation difficult and increase fhb erosion Piedmont-May 1 -Aug. 15
hazard. if soils become compacted during grading, loosen them to a depth of Coastal Plain-Apr. 15-Aug. 15 LOW VELOCITY 10-12 FT/SEC ` C502
6-8 inches using a Lipper,harrow,or chisel plow. Soil amendments WEIGHT 20 OZ/SY (680 G/M� MINIMUM ©2019 LaBelle Associates
SEEDBED PREPARATION Follow recommendations of soil tests or apply 2,000 Ib/acre ground M'NIMUM WIDTH 6.5 FEET EMERGENCY SPILLWAY TO BE
agricultural limestone and 750Ib/acre 10-10-10 fertilizer. cu 4DECUms IEXCEBED SIOL
Good seedbed preparation is essential to successful plant establishment. A g OPEN AREA 50% MAXIMUM PflowoE cuRLEx IExcELSIoR
good seedbed is well-pulverized, loose, and unifonn. Where hydroseeding MATTING
methods are used, the surface may be left with amore irregular Surface of Mulch
large clods and stones. Apply 4,000 lb/acre straw. Anchor straw by tacking with asphalt,netting,
or a mulch anchoring tool. A disk with blades set nearly straight can be CONSTRUCTION ALAMAN C E
Liming-Applylimeaccordin losoiltestrecommendations.Ii'the I-3 lcidit used as a mulch anchoring tool. 1. GRADE THE BASIN SO THAT THE BOTTOM IS LEVEL FROM TO BACK AND SIDE TO SIDE.
g P (a y) 2. INSTALL THE COIR FIBER BAFFLES IMMEDIATELY UPON EXCAVATION OF THE BASINS. BASIN
of the soil is not known,an application of ground agricultural limestone at the 3. INSTALL POSTS ACROSS THE WIDTH OF THE SEDIMENT TRAP (PRACTICE 6.62, SEDIMENT FENCE) - INFLUENT FLOATING AGGREGATES, LL
Maintenance 4. STEEL POSTS SHOULD BE DRIVEN TO A DEPTH OF 24 INCHES.AND SPACED A MAXIMUM OF 4 FEET APART. THE TOP OF THE
FABRIC SHOULD BE A MINIMUM OF 6 INCHES HIGHER THAN THE INVERT OF THE SPILLWAY. TOPS OF BAFFLES SHOULD BE A n6sIGN wA ER SURFACES MMER
Refertilize if growth is not fully adequate. Reseed, refertilize and mulch EEL sEEDETAI o 0
rate of I to 1 1/2 tons/acre on coarse-textured soils and 2-3 tons/acre on fine- immediatelyfollowing erosion or other damage. MINIMUM OF 2 INCHES LOWER THAN THE TOP ET THE EARTHEN EMBANKMENT. o F5
9 9 5. INSTALL AT LEAST THREE ROWS OF BAFFLES BETWEEN THE INLET AND OUTLET DISCHARGE POINT. BASINS LESS THAN 20 FEET BAFFLES TYPICAL Mr. Chad Threatt VP
textured soils is usually sufficient. Apply limestone uniformly and incorporate IN LENGTH MAY USE 2 BAFFLES. _40 SEE DETAIL
into the to 4-6 inches of soil. Soils with a pH of 6 of higher need not be 6. ATTACH A 9 GAUGE HIGH TENSION WIRE STRAND TO THE STEEL POSTS AT A HEIGHT OF 6 INCHES ABOVE THE SPILLWAY RIPRAPINLE7
I , IF, -
limed. P I g Table 6.10c Seeding mixture CONVERTED TO A PERMANENT STORMWATERELEVATION WITH PL&­TTC TIES OR WIRE RBBASIN OF A GREATER DNERS TO PREVENT EPTH, THE BAFFLE ING. IF THE PHEIIGHT SHOULD BENT E WEDASIN ON THE POLL PROTECTION
Temporary Seeding Species Rate (lb/acre) DEPTH DURING USE A TEMPORARY SEDIMENT BASIN.
Fertilizer-Base application rates on soil tests. When these are not possible, 7. EXTEND 9 GAUGE MINIMUM HIGH TENSION WIRE STRAND 0 SIDE OF BASIN OR INSTALL STEEL T-POSTS TO ANCHOR BAFFLE TO
apply a10-10-]0 fade fertilizer at 700-1,000 lb/acre. Both fertilizer and time Recommendations for Fall Rye (grain) 120 SIDE OF BASIN AND SECURE TO VERTICAL END POSTS.
II Y g S. DRAPE THE COIR FIBER MAT OVER THE WIRE STRAND MOUNTED AT A HEIGHT OF 6 INCHES ABOVE THE SPILLWAY ELEVATION.
should be incorporated into the top 4-6 inches of soil. if a hydraulic seeder is SECURE THE COIR FIBER MAT TO THE WIRE STRAND WITH PLASTIC TIES OR WIRE FASTENERS. ANCHOR THE MATTING TO THE
used,do not mix seed and fertilizer more than 30 minutes before application. Seeding dates SIDES AND FLOOR OF THE BASIN WITH 12 INCHES WIRE STAPLES, APPROXIMATELY 1 FT APART, ALONG THE BOTTOM AND SIDE 0.25)t'c' 0.25>1:1 0.25"elul 0.z5xr•
PP Mountains-Au 15- Dec. 15 SLOPES OF THE BASIN.
g• 9. DO NOT SPLICE THE FABRIC, BUT USE A CONTINUOUS PIECE ACROSS THE BASIN WATER SURFACE LENGTH"L"
Surface roughening-If recent tillage operations have resulted in a loose Coastal Plain and Piedmont-Aug. 15- Dec. 30 10. ADJUSTMENTS MAY BE REQUIRED IN THE STAPLING REQUIREMENTS TO FIT INDIVIDUAL SITE CONDITIONS. NQiE
Surface, additional roughening may not be required, except to break up large BASIN DESIGN .SEE PROJECT EROSION CONTROL PLAIN FOR SPECIFIC BASIN DIMENSIONS AND ORIENTATION
MAINTENANCE: INSPECT &1FFLES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL MAKE ANY REQUIRED REPAIRS IMMEDIATELY. BE z s
Soil amendments WATER LEVEL ELEV 5•-a F m TYPICAL BASIN PLAN
clods. if rainfall causes the surface to become sealed or crusted, loosen it SURE TO MAINTAIN ACCESS TO MAINTAIN ACCESS TO THE BAFFLES. SHOULD THE FABRIC OF A BAFFLE COLLAPSE, TEAR, DECOMPOSE, TOP OF DAM
Follow Soil tests ora I 2,000 lb/acre round agricultural limestone OR BECOME INEFFECTIVE, REPLACE IT PROMPTLY. REMOVE SEDIMENT DEPOSITS WHEN IT REACHES HALF FULL, TO PROVIDE ADEQUATE FLOATINGSURFACE MIN, q w
just prior to seeding by disking,raking,harrowing,rn other suitable methods. apply g g SKIMMER.SEED AI( _ B ELEVATION
and 1,000 lb/acre 10-10-10 fertilizer. STORAGE VOLUME FOR THE NEXT RAIN AND TO REDUCE PRESSURE ON THE BAFFLES. TAKE CARE TO AVOID DAMAGING THE BAFFLES
Groove or furrow slopes steeper than 3:1 on the contour before seeding DURING CLEANOUT, AND REPLACE IF DAMAGED DURING CLEANOUT.OPERATIONS. SEDIMENT DEPTH SHOULD NEVER EXCEED HALF THE 2
DESIGNED STORAGE DEPTH. AFTER THE CONTRIBUTING DRAINAGE AREA HAS BEEN PROPERLY STABILIZED, REMOVE ALL BAFFLE 117 EMERGENCY SUPPORT ROPE OR SUPPORT POST STAKE To
(Practice(i.03,Su1fncc Rattglielli/tg). Mulch MATERIALS AND UNSTABLE SEDIMENT DEPOSITS, BRING THE AREA TO GRADE, AND STABILIZE IT. BAFFLE QI SPILLWAY WIRE TO PREVENT 24"IMOBOUGM sUPPORTIM I
ELEVATION SAGGING 08810 E
PLANT SELECTION Apply 4,OOO lb/acre straw. Anchor straw by tacking with asphalt,netting, BASIN BOTTOM ELEVATION
or a mulch anchoring tool. A disk with blades set near) straight can be _ COMPACTED EARTH __ It
Select an appropriate species or species mixture from Table 6.1 Oa for seeding 9 Y 9 r] ' Ip /[[
used as a mulch anchoring tool. / POROUS B/S1 I LES EMBANKMENT STABILIZED OUTLET
in late winter and early spring, Table 6.1 Ob for summer, and Table 6.1 Oc for g \ 8 1 PAnnALeaslNsecnoN PROiILIZED
..--- - --- -_ __ ___
fall. C502 ) CONSTRUCTION SPECIFICATIONS COIR ESH OR SIMILAR
Maintenance / BAFFLE ELEVATION STAPLED OR TRENCHED
i.CLEAR,GRUB,AND STRIP THE AREA UNDER THE EMBANKMENT OFALL VEGETATION ANO INTO BOTTOM OR SIDE
In file Mountains, December and January seeding5 have pool- chances of Repair and refertilize damaged areas immediately. TopdresS With 50 ROOT MAT.REMOVE ALL SURFACE SOIL CONTAINING HIGH AMOUNTS OF ORGANIC CONSTRUCTION SPECIFICATION
necessary
lb/acre of nitrogen in March. If it is to extent tea MATTER AND STOCKPILE OR DISPOSE OF IT PROPERLY.HAUL ALL OBJECTIONABLE MATERIAL
Success. When It Is necessary to plant at these times, use recoIi mendation$ g rY temporary TO THE DESIGNATED DISPOSAL AREA,PLACE TEMPORARY SEDIMENT CONTROL MEASURES 1. GRADE THE BASIN SO THE BOTTOM IS LEVEL FRONT TO BACK AND SIDE TO SIDE.
cover beyond June 15, overseed with 50 Ib/acre Kobe Piedmont and BELOW BASIN AS NEEDED. 2.INSTALL POST ACROSS THE WIDTH OF THE SEDIMENT TRAP(PRACTICE 662,SEDIMENT FENCE)
for hill and a SCCUfCIy tacked mU1Ch, Y ( 3. STEEL POST SHOULD BE DRIVEN TOA DEPTH OF24INCHEB,SPACEDA MAXIMUM OF4FEET Coastal Plain) or Korean (Mountains) lespedeza In late February Or 2. Snow Camp Mine
ENSURE 711AT FILL MATERIAL FOR EMBANKMENT IS FREE OF ROOTS,WOODY VEGETATION, APART,AND INSTALLED UP THE SIDES OF THE BASIN AS WELL THE TOP OF THE FABRIC SHOULD
ORGANIC MATTER,AND OTHER OBJECTIONABLE MATERIAL.PLACE THE FILL IN LIFTS NOT TO BE 6 INCHES HIGHER THAN THE INVERT OF THE SPILLWAY.TOPS OF BAFFLES SHOULD BE 2 INCHES
SEEDING early March. EXCEED 9 INCHES AND MACHINE COMPACT IT.OVERFILL THE EMBANKMENT 6 INCHES TO LOWER THAN THE TOP OF THE BERMS.
Evenly apply seed using a cyclone Seeder(broadcast),drill,cultlpacker Seeder, ALLOW FOR SETTLEMENT. 4,INSTALL AT LEAST THREE ROWS OF BAFFLES BETWEEN THE AND THE OUTLET POINT.BASINS
LESS 20 FEEIN LENGTH MAY USE 2 BAFFLE& I
or hydrosceder. Use Seeding rates given ill Tables 6.1OT-6.IOC, Broadcast 3.SHAPE THE BASIN TO THE SPECIFIED DIMENSIONS.PREVENT THE SKIMMING DEVICE FROM 5,MENTHAN USING POST,ADD A SUPPORT WIRE OR ROPE ACROSS THE TOP OF THE MEASURE TO
SETTLING INTO THE MUD BY EXCAVATING A SHALLOW FIT UNDER THE SKIMMER OR PREVENT SAGGING.
Seedling and hyd COSCedlilg are appropriate for steep SIOPCS where equipment SETTLING
PROVIDING A LOW SUPPORT UNDER THE SKIMMER OF STONE OR BLOCK. 6,WRAP POROUS MATERIAL,LIKE JUTE BACKED BY COIR MATERIAL,OVER THE TOP WIRE.711E FABRIC
Cannot be driven, Hand broadcasting 15 not recommended because Of the SHOULD HAVE FIVE TO TEN PERCENT OPENINGS IN THE WEAVE.ATTACH FABRIC TO A ROPE AND
4.PLACE THE BARREL(TYPICALLY 4-INCH SCHEDULE 40 PVC PIPE)ON A RUN,SMOOTH SUPPORT STRUCTURE WITH ZIP TIES,WIRE,OR STAPLES.
difficulty In achieving a uniform distribution. qt wF vll FOUNDATION OF IMPERVIOUS SOIL AD NOT USE PERVIOUS MATERIAL SUCH AS SAND, 7.THE BOTTOM AND SIDES OF THE FABRIC SHOULD BE ANCHORED IN A TRENCH OR PINNED WITH
a�0 }�I'll� GRAVEL,OR CRUSHED STONE AS SACKFUL AROUND THE PIPE.PLACE THE FILL MATERIAL 8 INCH EROSION CONTROL MATTING STAPLES.
r llI AROUND THE PIPE SPILLWAY IN 4-INCH LAYERS AND COMPACT IT UNDER AND AROUND 8,DO NOT SPLICE THE FABRIC,BUT USE A CONTINUOUS PIECE ACROSS THE BASIN.
Small grams should be planted no more than 1 711C17 deep, 817d grasses and , tl) ' N ERT PIPE THE PIPE TO AT LEAST THE SAME DENSITY AS THE ADJACENT EMBANKMENT.CARE MUST BE
NOTES: PJ<�)( (}I:,.,,
1Cgl1mC5 I10 ImOfC than I/2 Inch. Broadcast SCCd Imllst be COVCCCd by Cakll7g STRUCTURAL BSTDRi SHALL BE >' I )(L F Jl�', COMPACTTAKEN TIT TO ING UNDISE THE PIPE ER THE PIPE HAUNCHES THE.
or CONTACT WITH ITS FOUNDATION WHEN MAINTENANCE
CIASSDSWNE. 11 x M ' Y �Xrf .`„
Or chain dragging, and then lightly firmed with a roller or cultipackeL 2. SEDIMENT COMPOLSTONE +Lj J�MF)(i,(,/% M`i PLACE A MINIMUM DEPTH OF2FEET OF COMPACTED BACNfIII OVER THE PIPE SPILLWAY INSPECT BAFFLES AT LEAST ONCE AWEEK AND AFTER EACH PAINFALL,MAKE ANY REQUIRED REPAIRS
IIydCOSCedCd IlllxtllCCs should mCILIdC a WOOCI ilbCC(CCIhIOSC)In11C11. SHALL DE N0.50R N0.5] ttt( nOPJ BEFORE CROSSING IT WITH CONSTRUCTION EQUIPMENT.IN NO CASE SHOULDTILE PIPE IMMEDIATELY.
STONE. �#, r}�-1/ { CONDUIT BE INSTALLED BY CUTTING ATRelCt1 THROUGH THE DAM AFTER THE EMBANKMENT
3. DIMENSIONS ARE MINIMUM �'t� Ir) ( q C, ,:vL' � IS COMPLETE. BE SURE TO MAINTAIN ACCESS TO THE BAFFLES.SHOULD THE FABRIC OF A BAFFLE COLLAPSE,TEAR,
MULCHING ACCEPTABLE UNLESS OTHERWISE A i r�7-ti {)d o(( rbtL A DECOMPOSE,OR BECOME INEFFECTIVE,REPLACE IT PROMPTLY.
SPECIFIED BYTHEENGINEER. f Ili 711 t S.ASSEMBLE THE SKIMMER FOLLOWING THE MANUFACTURERS INSTRUCTIONS,OR AS DESIGNED.
The use of alappropriate mulch will help ensure establishment undernormal - k7z. /,1� A( I�OQ(� REMOVE SEDIMENT DEPOSITS WHEN IT REACHES HALF FULL TO PROVIDE ADEQUATE STORAGE
I Xi�\YIlAr 6,LAY THE ASSEMBLED SUMMER ON THE BOTTOM OF THE BASIN NTH THE FLEMBLE JOINT AT THE VOLUME FOR THE NEXT RAIN AND TO REDUCE PRESSURE ON THE BAFFLES. ADDITIONAL STREAMINFO-ALAM.AGG.
conditions, and IS essential to seeding Success Linder harsh Site conditions Nt en"" INLET OF THE BARREL PIPE.ATTACH THE FLEXIBLE JOINT TO THE BARREL PIPE AND POSITION THE
(Practice 6.14,Mulching). Harsh site conditions include:
✓K"* '_ L' Y SKIMMER OVER THE EXCAVATED PIT OR SUPPORT.BE SURE TO ATTACK A ROPE TO THE SKIMMER AFT ER THE CONTRIBUTING DRAINAGE AREA HAS BEEN PROPERLY STABIHZED,REMOVE ALL BAFFLE 1 1/20/20 &LAND QUALITY COMMENTS
SIDE OF THE BASIN.THIS WILL BE USED TO PULL THE SKIMMER TO THE MATERIALS AND UNSTABLE SEDIMENT DEPOSITS,BRING THE AREA TO GRADE,AND STABILIZE IT.
• seeding in Tall for winter cover (wood fiber mulches are not Considered SIDE FOR MAINTENANCE. NO: DATE: DESCRIPTION:
adequate for this use), Sediment Basin Baffle
I ) 7.EARTHEN SPILLWAYS REVISIONS
STRUCTURAL STONE POSSIBLE.DIE ACHIEVEMENT OF PLANNED ELEVATIONS,GRADE,DESIGN WIDTH,AND
• slopes Steeper than 3:1, ENTRANCE AND EXIT CHANNEL SLOPES ARE CRITICAL TO THE SUCCESSFUL OPERATION OF 6"ID.SCH 40 SKIMMER
FLOOD STORAGE ZONE PROJECT NUMBER:
T MIMIC} _Jam! CONSTRUCTION iPECIFICATION5 TOP OF DATA THE SPILLWAY.FABRIC.
P THE
ABRICSHOULD MUST HE WED WITH LAMINATED PLASTIC IMPERMEABLE PVC PIPE FLOAT INFLUENT
• excessively hot or dry weather, SEDIMENT STORAGEZON� I I- 12"MIN.WASHEO 70POFWEIR GEOTIX7ILEFABRIC.THEFAOflIChiUSTBEWIOEANDLONGENOUGHTOCOVEflTHEBOnOM 6'PVC W 2190335
1.CLEAR,GRUB AND STRIP THE AREA UNDER THE EMBANKMENT OF ALL VEGETATION STONE FILTER 61 MIN, AND SIDES AND EXTEND ONTO THE TOP OF THE DAM FOR ANCHORING IN A TRENCH.THE BEND TV.
• adverse SOIIs shallow,rocky,Or high Ill CI(I Or sand),im(i - -ROW AND ROOT MAT.REMOVE ALL SURFACE SOIL CONTAINING HIGH AMOUNTS OF NCDOT STD.#57 EDGES MAY BE SECURED WITH B-INCH STAPLES OR PINS.711E FABRIC MUST BE LONG ENOUGH
( Y g Y ) It R PIP TO EXTEND DOWN THE SLOPE AND EMT ONTO STABLE GROUND.THE WON OF THE FABRIC
ORGANIC AWTER AND STOCKPILE 02 DISPOSE OF IT PROPERLY.HAUL ALL 3600 CU.FT./ACRE .5 DRAWN BY:
NATURAL GROUND J ill OBJECTIONABLE MATERIAL TO THE DESIGNATED DISPOSAL AREA. T MUST BE ONE PIECE,HOT JOINED OR SPLICED;OTHERWISE WATER CAN GET UNDER THE FADRIG. KC� •r
• anCON I'CCC1Ving COUCCULCatC(i flow. �I I I BEDIMAIT TRAP IS'MAX, IF THE LENGTH OF THE FABRIC IS INSUFFICIENT FOR THE E14TIRE LENGTH OF THE SPILLWAY, r\v�/A I�
36°PIPE MPX 2.ENSURE TIIAIFILL MATERIAL FOR THE EM- ROOTS,WOODY__. _ _IA ___ _ ._ _ .. ., i, _ „,,,,, «<STMNS eEeuuiuC THE Munie7E?*!Du„nv Enmm THE SEC7M,-,
SECTION A-A VmuLLIllLFTNOTOECEED9-UUHES ANDUUJtUI MACHINE COMPACT
OVER �Ty ,. SHOULDOVER.._..HELO....._.,.-_-....-_.-.,._..ATER._---_... UNDE„--_..-BRIO REVIEWED BY:
. If the area t0 be mulched 1S SllbJCCt to COflCellt'ated watCl'f10\V, CIS]Il Cham1C1S, SEDIMENTCOMFlOLSIDNEJ THE FILLIIJLnSNOTTOEXCEE09-INCNESANDtdACHINECOh1PACT IT.OVER ALL �� SHOuIOOVERLAPTIiELOWERSEG710N(S)SO THAT WATEflCANNOT FLOW OIOERTHE FAWI0. q'PVC VENT 4'x4°TEE PAS
THEEMBANKIIE O6-INCHESTOALLOWFORBANKME T.
COARSE STONE ALL SECURE THE UPPER EDGE AND SIDES OF THE FABRIC IN A TRENCH WITH STAPLES OR PINS.
anchor mulch with nettingPractice(i.14 Mulclrin= .
( ' £`) " ---'� 3.BETWEEN Ill RIPUTLETSEHES IN FTHE ROM PIPING
PROTECT THE FABRICCONNECTION CLASS BEROSIOt1 FlLTEfl EROTIC
STANDARD ROCK PIPE INLET PROTECTION tRIPMPAND THE SOIL WONT PIPING BY USING FILTER FABRIC OR CONTROL 670NE B.INLETS-DISCHARGE WATER INTO THE BASIN IN MANNER TO PREVENT EROSION.USE
Reseed and mulch areas Where seedling emergence IS poor, or Where erosion / 5 �-- _ _ _____ _ _ _ KEYWAY CZFF TRENCH BETWEEN THE AFFAIR STRUCTURE AND THE SOIL TEMPORARY SLOPE DRAINS OR DIVERSIONS WITH OUTLET PR07ECTION TO DIVERT SEDIMENT ISSUED FOR: Tp
Maintenance r g p LADEN WATER TO THE UPPER END OF THE POOL AREA TO IMPROVE BASIN TRAP EFFICIENCY. CONSTRUCTION
RUCTION
occurs, as soon as possible. Do not mow. Protect from Traffic as much as cso2 ` Cftoss SECTION p _ r` a. ACROSSLATE TESPIL FILTER FABRIC UNDATIBETWEEN NAN SIDESIPRAP TO THESOIL.EXTENDTHE THE FABRIC 9.EROSION DVERT SURFACE
WATER STRUCTAWAY
FROM
BARE AREAS.
COMPLETE
THE
AED AREANKMENT BEFORMIZED.
possible.
ACROSS THE SPILLWAY FOUNDATION AND SIDES TO THE 70P OF THE DAM; OVERT SURFACE WATER AWAY FA0IA BARE AREAS.COPMPLETE THE EMBANKMENT BEFORE FLOW CONTROL GALVANIZED Sit
THE AREA IS CLEARED.STABILIZE THE EMERGENCY SPILLWAY EMBANKMENT AND ALL OTHER ORIFICE STRAP TYPICAL DATE:
OR DISTURBED AREAS ABOVE THE CREST OF THE PRINCIPAL SPILLWAY IMMEDIATELY AFTER 1/23/20
OVERFILL 4"FOft EMERGENCY BY-PASS 6' CONSTRUCTION. 4°ID.SCH,40
S1(L'P1"G)OPCIf%On b, EXCAVATE AKEYPlAYWENCHALONG IHECElTEPLINEOFTHEEPILLWAy DESIGN
1 21" SETTLEMENT BELOW SETTLED TOP
SETTLED OF DAM 10.INSTALL POROUS BAFFLES AS INDICATED IN SEDIMENT BASIN BAFFLE DETAIL.
References / OUNOAiDN EXTENDING UP THE SIDES TO THE HEIGHT OF THE DATA THE WENCH MIN. 0 D _
6.03,Surface Roughening I 2'MIu I ]a I SHOULD FEAT LEAST 2-FEET DEEP AND&FEET WIDE NTH 1:1 SIDE SLOPES, TOP I1.AFTER ALL THE SEDIMENT PRODUCING AREAS HAVE BEEN PERMANENTLY STABILIZED,REMOVE DRAWING NAME:
Y 1.6' THE STRUCTURE AND ALL THE UNSTABLE SEDIMENT.SMOOTH THE AREA TO BLEND WITH THEP,
6.O4,TO SOlhllg SOIL 4.CLEARTHEPJNDAREABELOWHEELEVATIONOFTHECRESTOFTHEEMBANKMENT.
�d (
a, Top soiling I ADJOINING AREAS AND STABILIZE PROPERLY, SKIMMER
3 SOIL ,;, J 111 1 gTl S.ALL CUT ANDFILL SLOPES SHOULD BE 2:10R FLATTER. Salt NATURAL G'END CAP INFLUENT
1= Y ! 1 1 X'. 2' i� 6, ENSURE THAT THE STONE(DRAINAGE)SECTION OF THE EMBANKMENT HAS A MINIMUM Fl L 1'-61
"q M .[!+ 1✓v v L h == Mp.. GflOUND tdAINTENANCE
Sul fiice Stabilization BOTTOM W DTI OF 3-FEET AND MAXIMUM SIDE SLOPES OF I:I TRAT EXiENDTO THE _ 5'-(Y'
MUTANT OF TIE SPILLWAY SECTION, INSPECT SKIMMER SEDIMENT BASINS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT(ONE-HALF
O° 6.i I,Permanent Seeding ]. CONSTRUCT MINIMUM FINISHED STONE SPILLWAY BOTTOM WIDTII,AB SHO'NN ON 3 2:1510E INCH OR GREATER)RAINFALL EVENT AND REPAIR IMMEDIATELY.REMOVE SEDIMENT AND RESTORE
C'Og FILTER IN. SLOPE MAX. SKIMMER PLAN
6.14,Mulching THE FLANS WITH 2:1 SIDE SLOPES EXTENDING TO THE TOP OF THE OVER FILLED FABRIC AI SIDE HEOASINTOITSORIGINALDIMENSIONSWHENSEDIMEMACCVMMUAiE5T00NE-HALF THE 6'ID.SCH,40
EMBANKMEW.KEEP THE THICKNESS OF THE SIDES OF THE SPILLWAY OUTLET STRUCTURE HEIGHT OF THE FIRST BAFFLE.PULL THE SKIMMER TO ONE SIDE SO THAT THE SEDIMENT UNDERNEATH PVC PIPE FLOAT
U d'TYPICAL AT A MIMMUH OF 21 INCHES.THE WEIR MUST BE LEVEL AND CONSTRUCTED TO GRADE SLOPE MAX. IT CAN BE EXCAVATED.EXCAVATE THE SEDIMENT FROM THE ENTIRE BASIN,NOT JUST AROUND THE 4'PVC VENT
Oj rf/)fJE'JT(ifl" TO ASSURE MSIGNCAPACI7V. STONE SECTION SKIMM11EFlOR THE FIRST CELL.MAKE SURE VEGETATION GROWINGIN THE BOnOM110F THE BA51tJ 3'-6" T'-6" EROSION AND
B. MATERIAL DO IN THE STONE SECTION SHOULD BE WELL-GRADED MIXTURE OF STONE DOES NOT HOLD DOWN THE SKIMMER.p 8.02,Vegetation Tables WAR A d50 SZE OF 9-INCHES(CLASS B EROSION CONTROL STONE IS RECOMMENDED) MAINTENANCE REPAIR THE BAFFLES IF THEY ARE DAMAGED.RE-ANCHOR THE BAFFLES IF WATER IS FLOWING
a ADD THE SMIOM STONE SIZE STONES
WORKED
INCHES. E E STONEVOIDS OF THE LARGER
INE STORES.THE
UNDERNEATH OR AROUND iI{ENT. SEDIMENT CONTROL
c A'J ADD THE SMIUER SiDNES WORKED INTO THE VOIDS OF THE LARGER STONES.TI{E 1. INSPECT TEMPORARY SEDIMENT TRAPS AFTER EACH PERIOD OF SIGNIFICANT 4"2ZS BEND
'5 'E: CONSTRUCTION SPECIFICATIONS' STONE SHOUD BE HARD,ANGULAR,AND HIGHLY WEATHER-RESISTANT. IF THE SKIMMER IS CLOGGED W9TI{TRASH AND THERE IS WATER IN TI1F.BASS,USUALLY JERKING
Y U 7.BEMOVE AND PROPERLY DISPOSE OF ALL TREES,BRUSH,STUMPS AND OTHER OBJECTIONABLE 9, ENSURE THAI THE STONE SPILLWAY OUTLET SECTION EXTENDS DOWNSWEAM PAST THE RAINFALL.REMOVE SEDIMENT AND RESTORE i!{E TRAP TO ITS ORIGINAL DIMENSIONS ON THE ROPE WILL MAKE THE SKIMMER BOB UP AND DOWN AND DISLODGE THE DEBRIS AND
SPxI1U6
MATERIAL 70E OF TI{E EMBANKMEtJT UNTIL STABLE COCITIONS ARE REACHED AND OUTLET WHEN THE SEDIMENT HAS ACCUMULATED TO ONE-HALF THE DESIGN DEPTH OF THE RESTORE FLOW.IF THIS DOES NOT WORK,FULL THE SKIMMER OVER TO THE SIDE OF THE BASIN 4°PVC TEE
DETAILS
. ? WAP.PLACE THE SEDIMENT THAT IS REMOVED IN THE DESIGNATED DISPOSAL AREA STNSTL.HOSE 4°x4'PVCTEE
C U 2 ENSURE THAT THE MINIMUM CONSTRUCTED CROSS SECTION MEETS ALL DESIGN REQUIREMENTS, VELOCITY IS ACCEPTABLE FOR THE RECEIVING STREAM.KEEP THE EDGES OF THE STONE AND REPLACE THE CONTAMINATED PART OF THE GRAVEL FACING. CAND LOGGED;
SO REMOVE
THE ORIFICE INSIDE THE SHIMMER TO SEE IF IT IS CLAMPS TYP.
m C, 3, ENSURE THAT THE TOP OF THE DIKE IS NOT LOWER AT ANY POINT THAN THE DESIGN ELEVATION OUTLET BECTON FLUSH Wild THE SURROUNDING GROUND AND SHAPE THE CENTER TO CLOGGED;IF SO REh10VE THE DEBPoS.
2.CHECK THE STRUCTURE FOR DAMAGE FROM EROSION OR PIPING.PERIODICALLY 4°PVC FLANGE
U' Q PLUS THE SPECIFIED SETTLEMENT. CONFINE T@OUTFLOW STREAM(REFERENCES:OUTLET PROTECTION). 4°FLEXIBLE
U CHECK THE DEPTH O{OF THE SPILLWAY TD ENSURE ITISAtAMMU1MOFi.5 FT.BELOW IF ARMOR H A PLUMBER'S
IS CLOGGED,THE BE AND THE
m . 4,PROVIDE SUFFlCIEM BOOM AROUND DIVERSIONS PERMIT MACHINE REGRADING AND TO,SO THAT FL(W WILL BYPASS TO DAMAGENATURAL,EMBANKMENT.
STABLE AREAS LOCATE BYPASS OUTLETS THE LOW POINTOFTHE EMBANKMENT. ALL ANY SETTLEMENT OF THE OBSiRUCiI@JCLEARED WITHAPWMBER'S SNAKE Ofl BY FLUSHING WITH WATER.BE SURE AND HOSE
CLEANOIT. SO7HAT RdV WILL HOT DAMAGE THE EMBANKMENT' EMBANKMENT TO SLIGHTLY ABOVE DESIGN GRADE.ANYRIPRAPDISPLACEDFRUM REPLACE THE ORIFICE BEFORE REPOSITIONING THE SKIMMER. 3°LD.SC11.40 nOW CONWOL ORIFICE
6,VEGETATE THE RIDGE IMMEDIATELY AFTER CONSTRUCTION,UNLESS IT WILL REMAIN IN PLACE 11.STABILIZE THE EMBANKMENT AND ALL DISTURBED AREAS ABOVE 711E SEDIMENT POOL PVC PIPE CUT SMOOTH CIRCULAR
a LESS THEN 30 WORKING DAYS. THE SPILLWAY MUST BE REPLACED IMMEDIATELY. CHECK THE FABRIC LINED SPILLWAY FOR DAMAGE AND MAKE ANY REQUIRED REPAIRS WITIi
a AN(REFERENCE:
ERENC :SURFCEST!{ETRATION).IMMEDIATELY IOPENING NDICAEDONBASINION DRAWING NUMBER:
.. 3.AFTER ALL SEDIMENT-PRODUCING AREAS HAVE BEEN PERMANENTLY STABILIZED. FABRIC THAT SPANS THE FULL WIDTH OF THE SPILLWAY.CHECK THE EMBANKMENT,SPILLWAYS,
o A MAINTENANCE SHOW EEDSTARFACE STABILIZATION). AND OUT LET FOR EROSION DAMAGE,AND INSPECT THE EMBANKMENT FOR PIPING AND ` INDICATED ON BASIN SITE
Flfh10VE il{E STRUCTURE AND All UNSTABLE SEDIMENT.SMOOTH THE AREA TO PLAN
12.SHOW THE DSTANCE FROM THE TOP OF THE SPILLWAY TO THE SEDIMENT GLEANOUT OAST!BOTTOM
W U INSPECT TEMPORARY DIVERSIONS ONCE A WEEK AND AFTER EVERY RAINFALL,IMMEDIATELY LEVEL(ONE-IALF THE DESIGN DEPTH)ON THE PLANS AND MARK IT IN THE FIELD. BLEN➢WTN THE ADJOINING AREAS AND STABILIZE PROPERLY(REFERENCES! SETTLEMENT.MAKE ALL NECESSARY REPAIRS IMMEDIATELY.REMOVE ALL WASH AND OTHER
w 30 - REMOVE SEDIMENT FROM THE FLOW AREA ARE REPAIR THE DIVEflSION RIDGE.CAREFULLY SURFACE STABILIZATION). DEBRIS FROM THE SKIMMER AND POOL AREAS. SKIMMER ELEVATION
CD c CHECK OUTLETS AND MAKE TIMELY REPAIRS AS NEEDED WHEN THE AREA PROTECTED IS
N FREEZING WEATHER CAN RESULT N ICE FORMING N THE BASIN.SOME SPECIAL PRECAUTIONS
M U GROUNDLEVELALY A0APPR,P MOVE APPROPRIATELY
RIDGE AND 71{ECHANNEL TO BLEND WITHTI{ENATURAL SHOULD BE TAKEN IN THE WINTER TO PREVENT THE SKIMMER FROMPLUGG114GNTHICE. Floating Surface Skimmer
T GROUND LEVEL AND APPROPRIATELY STABILIZE IT. 9
E N 4 `TEMPORARY SEEDING DETAIL ' 3\TEMPORARY DIVERSION DITCH '" 2.\TEMPORARY SEDIMENT TRAP 1' SEDIMENT BASIN AND SKIMMER
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