SW4240203 Response for Additional Information (Attachment)_20240801

Docusign Envelope ID:24D6A610-93E4-481B-B355-C6824EFDDAOA
B E E-8-0-11 BCRRTER. PA.
CIVIL ENGINEERS LAND SURVEYORS
LAND PLANNING
August 1, 2024
NC DEQ—Post Construction Stormwater Permitting
C/O Brianna Holland
State Stormwater Engineer
RE: Second Request for Additional Information, Permit#SW44240203,Hidden Woods
Village Residential Subdivision
Ms. Holland:
Please find the response to the comments below for items indicated in your email request for
additional information dated July 31, 2024. Revised documents and plans have been enclosed in
this submittal package.
Comment#1: "Please upload plan sheet P-5 and provide the sizing/design calculations for the
riprap apron in order to demonstrate compliance with 15A NCAC 2H.1003(5): Stormwater
outlets shall be designed so that they do not cause erosion downslope of the discharge point
during the peak flow from the 10 year storm event as shown by engineering calculations.
Original Response: Plan sheet P-5 is from the original engineer on the project and dates back to
February 2008. This sheet is not available in a final sealed version. I have provided the
additional sheets P-4 through P-6 the owner has been able to get from the original engineer and
they are marked"Preliminary Not for Construction". The sheets I have provided(P-1 through P-
3are the final sealed sheets provided from Forsyth County/City of Winston Salem available
records. I have reviewed this culvert which was installed in the 2008-2009 time period and can
certify to the best of my professional knowledge and based on a visit to the site on March 28,
2023 the riprap apron was installed and I found no evidence of downslope erosion. The
downslope drainageway was stable and vegetated.
The riprap apron sizing is found near the bottom center of sheet P-6.
Additional Response: In addition to this engineer's original response to professionally certify
conditions below the culvert as non-erosive based on visual observation approximately 14-15
years after installation of the culvert on site, I have added the calculations to support the original
engineer's design for the riprap apron.
My calculations for a 10-year storm event indicate the apron should be minimum of 26' in length
and 15' in width with Riprap D50 of 12 inches or Class 2 riprap to provide non-erosive conditions
below this culvert. The design engineer for the culvert outlet specified 26' in length by 30' in
width using Class 11 riprap. A chart of NCDOT riprap specifications follows.
PO Box 669 Walkertown, NC 27051 336-748-0071

Docusign Envelope ID:24D6A610-93E4-481B-B355-C6824EFDDAOA
BEES011 B CRRTM PR.
CIVIL ENGINEERS LAND SURVEYORS
LAND PLANNING
TABLE 1042-1
ACCEPTANCE CRITERIA FOR RIP RAP AND STONE FOR EROSION CONTROL
Class Required Stone Sixes, inches
Minimum Midrange Maximum
A 2 4 6
B 5 8 12
1 5 10 17
2 9 14 23
I look forward to your positive review and will be available for any further details or discussion
that may be needed.
Kindest Regards,
,
038574 =
Alex Carter, PE
acarter(abc-eng com ,,�9�'•`�'UCINE��•' ��,.�''�
336.748.0071 ofc %,; C N.V
336.345.4964 cell
8/1/2024
PO Box 669 Walkertown, NC 27051 336-748-0071

Docusign Envelope ID:24D6A610-93E4-481B-B355-C6824EFDDAOA
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Docusign Envelope ID:24D6A610-93E4-481B-B355-C6824EFDDAOA
Hydrology Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Thursday,Aug 1 2024
Hidden Woods Village Street Pipe
H dro ra h type = Rational Peak discharge (cfs) = 46.90
Storm frequency rs = 10 Time interval (min) = 1
Drainage area (ac) = 21.600 Runoff coeff. (C) = 0.3
Rainfall Inten (in/hr) = 7.238 Tc by User (min) = 5
OF Curve = Hidden Woods Village NOAA.IDFRec limb factor = 1.00
Hydrograph Volume=14,071 (cuft);0.323(acft)
Runoff Hydrograph
Q (cfs) 10-yr frequency Q (cfs)
50.00 50.00
40.00 40.00
30.00 30.00
20.00 20.00
10.00 10.00
0.00 0.00
0 5 10
Time (min)
Runoff Hyd - Qp =46.90 (cfs)

Docusign Envelope ID:24D6A610-93E4-481B-B355-C6824EFDDAOA
Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Thursday,Aug 1 2024
Hidden Woods Village Street Pipe
Invert Elev Dn (ft) = 100.00 Calculations
Pipe Length (ft) = 111.50 Qmin (cfs) = 46.90
Slope (%) = 1.09 Qmax (cfs) = 46.90
Invert Elev Up (ft) = 101.22 Tailwater Elev (ft) = Normal
Rise (in) = 48.0
Shape = Circular Highlighted
Span (in) = 48.0 Qtotal cfs = 46.90
No. Barrels = 1 Qpipe (cfs) = 46.90
n-Value = 0.012 Qoverto cfs = 0.00
Culvert Type = Circular Concrete Veloc Dn (ft/s) = 10.49
Culvert Entrance = Square edge w/headwall (C) Veloc U ft/s = 7.24
Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5 rHGL Dn ft = 101.54
HGL Up (ft) = 103.27
Embankment Hw Elev (ft) = 104.20
Top Elevation (ft) = 108.00 Hw/D (ft) = 0.74
Top Width (ft) = 25.00 Flow Regime = Inlet Control
Crest Width (ft) = 50.00
E-(t) Hidden Woods Village Street Pipe H.Depth(1)
109A0 7.78
108.00 6.78
107.00 5.70
106.00 4.78
105.00 3.78
104.00 2.78
103.00 1.78
102.00 0.78
101 an -022
100.00 -122
99.00 222
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Circular Culvert HGL Embank
Reach(t)

Docusign Envelope ID:24D6A610-93E4-481B-B355-C6824EFDDAOA
DESIGN OF OUTLET PROTECTION
User In ut Data
Calculated Value
Reference Data
Designed By: ATC Date: 8/1/2024
Checked By: JEB Date: 8/1/2024
Company: Beeson&Carter,PA
Project Name: Hidden Woods Village
Project No.: 23-201
Site Location(City/Town) Rural Hall,NC
Culvert Id. Street Cross Pipe
Total Drainage Area(acres) 19.5
Step 1. Determine the tailwater depth from channel characteristics below the
pipe outlet for the design capacity of the pipe. If the tailwater depth is less
than half the outlet pipe diameter,it is classified minimum tailwater canditon_
If it is greater rhan half the pipe diameter,it is classified maximum condition.
Pipes that outlet onto wide flat areas with no defined channel are assumed
to have a minvnum tailwater condition unless reliable flood stage elevations
show othencise_
Outlet pipe diameter,Do(in.) 48
Tailwater depth(in.) 18.5
Minimum/Maximum tailwater? Min TW(Fig.8.06a)
Discharge(cfs) 46.9
Velocity(ft./s) 10.49
Step 2. Based on the tailwater conditions determined in step 1,enter Figure
8.06a or Figure 8.06b,and determine dso riprap size and minimum apron length
(L). The d.size is the median stone size in a well-graded riprap apron.
Step 3. Determine apron width at the pipe outlet,the apron shape,and the
apron width at the outlet end from the same figure used m Step 2.
Minimum TW Maximum TW
Figure 8.06a Figure 8.06b
Riprap dso,(ft.) 1
Minimum apron length,La(ft.) 26
Apron width at pipe outlet(ft.) 12 12
Apron shape To downstream swale
Apron width at outlet end(ft.) 4 14.4
Step 4. Dererrzune the rnammum stone diameter:
d_=1.5xdsu
Minimum TW Maximum TW
Max Stone Diameter,dmax(ft.) 0 1.5
Step 5. Determine the apron thickness:
Apron thickness=1.5 x d,u
Minimum TW Maximum TW
Apron Thickness(ft.) 0 2.25
Step 6. Fit the nprap apron to the site by making it 1e ml.for the minimttm
tmgth, L.from Figure 8 06a m Figure 8 06b_ Extend the apron farther
downstream and along charnel banks u UL stability is assured_ Keep the
apron as straight as possible and align it with the flow of the receiving stream.
Make any necessary alignment bends near the pipe outlet so that the entrance
into the receiving stream is straight
Some locations may require lining of the entire channel=as section to assure
stability.
It may be necessary to inrxease the size of riprap where protection of the
charnel side slopes is necessary(Appendix 8.05). Where overfalls exist at
pipe outlets or flaws are excessive,a plunge pool should be considered,see
page 8.06.8.

Docusign Envelope ID:24D6A610-93E4-481B-B355-C6824EFDDAOA
Figure 8.06a: Design of outlet protection from a round pipe flowing full, minimum
tailwater condition (Tw<0.5 diameter)
3v TTI[I
Outlet u D4 + t.a �� "II:;-[I.. Return to Main Worksheet
pipe ... . -�I II
diameter(DO)
ilHater
fits70
ra�p4 60
t 4
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a
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3 5 10 20 50 100 Zan 500 1000
Discharge(Oisec)
Curves may not be extrapolated.
Figure 8.06a Design of pullet proleclion proDmifon from a rourW pipe flowing full,minimum tdilwal6r condition(T.c 0.5 dametpr).
R-13f93 0.063

Docusign Envelope ID:24D6A610-93E4-481B-B355-C6824EFDDAOA
NORTH AMERICAN GREEN 12' STAPLE PATTERN GUIDE
a•+z7!mm 07;09 FAY 23912727:t !s/fC :usPCCF:ome.____! Qtot:rot (30 an)MAT LINED CHANNEL A
-5" (5cm-12.5cm) f O '27-3" (5cm-12.5c-)COMPACTED I ^�y
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SOIL "" -
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CONSTRUCTION SPECIFICATIONS
I A TREES, BRUSH, STUMPS, AND OTHER �rI f;ir i CHANNEL SLOPE = 0 / 1 r4'� 0.7 STAPLES PER 50.North
-
1. REMOVE AND PROPERLY DISPOSE OF ALL � (0.8 STAPLES PER SO M) r^ � S � I� �
OBJECTIONABLE MATERIAL I For btonkets with the optional Norfh American ^ W
Green DOT System'"ploce staples/stakes F� �j Z U x
?;t,, Q through each of the BLUE colored dots. O � M' 'p
2. ENSURE THAT THE MINIMUM CONSTRUCTED CROSS SECTION MEETS ALL DESIGN ���
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REQU E E �'xScc_Yxrt. ,,,1,, 2"-5" (5cm-12.5cm) 2' S" ( ) M
R AT THE TOP OF THE DIKE IS NOT LOWER AT ANY POINT THAN THE DITCH A B C 0 CHANNEL LINING/
Sun-12.ban W
3. ENSURE THAT 1 .
M ER 5m N B 1 U FT FT FT FT T STAPLE PATTERN
PUS THE SPECIFIED SETTLEMENT. ) ( ) ) /F ) •1'� 2' 0.6m
DESIGN ELEVATION L \ .� ( )
r-7ir S%`?✓ iU%�t sIC riFk.A'•'i.'Vs .�'� 6 J' (0.9m) h^ 1 e Il h, _I
TO PERMIT MACHINE O
4. PROVIDE SUFFICIENT ROOM AROUND DIVERSIONS
sR:+;f ;;'F o?<s�.4> is:'r`2 - Jrrvcy s,zv�) 1 3.0 0.0 1.67� .0197 S75/D Seam stitc 4' (1,2m Sam st' c [1
REGRADING AND CLEANOUT. _ . . . . . . . .
1. i1hY.�+i IS EFFF!:IfY:. Lam'(N7;"[£:5 T:A,%IL{•►FLi /D . . I
AFTER CONSTRUCTION UNLESS IT MALL J lxICkP?-z5 - •NOr LESS ?0.'n!r::i('u>-WVWEs ' 2 3.0 7.0 1.67� .0197 S75 •• (1.8m)
5. VEGETATE THE RIDGE IMMEDIATELYA. A1?,. mc-�ass n.+sa•rtt!. F<v1H/a <!.L pO.Av: �S rr a. -e" 6 ( ) 10
REMAIN IN PLACE LESS THAN 30 WORKING DAYS. s WAVL74 - m:n :-:ssa+rr. +f+r�+z.s.�!,A N e" `. '.'.". 3•J'
3 3.0 0.0 1.67 .t 2 C125/0 3 J' 1.Om (1.0m)
ti D£ 4frK"i7 +G!r;,+rGl't S:1Nl/cAT?%At� fY (1�Crn-1SCnt
e;+ Hsu;. f+ef•r-ram wa :fs. r ►r4s�Nc!s R£ixram; +;S�A1c sECrft CA' 4 3.0 0.0 1.67 .12 RIP RAP d50=15 (15 Cirri) `. 1.6' (0.5m)
A-1 A^CA S An,Y,'cU kt71!0TVS'krD 5;.N. hq,.0+L'Y.A:YS'1.1'!r,A J<PC 0tkT! .^Ef4lGt> T<P
OP SOVEN7 VA.PN AL:' Sc n<E,yj sbXtt 9E PA,I�V'E^F?LYr`IrrmAf:J r Vr's�AI DRA!N,. 3.0 O.0 ' .O1 $75/D ` • •
MAINTENANCE :: OT WAa7?CO.Irz -rt.xa�!;+ -A f.4M,- D<a GMAV�, 00AP.L:s Er' OR-ERAA'PP7W? � 1.67 t T.3' (1.0m)
INSPECT TEMPORARY DIVERSIONS ONCE A WEEK AND AFTER EVERY RAINFALL t ;<A+v�7+Ax?- ;«Fn'�!nct si A t DC AlAL.':A;Nfy m A t-!Yat!)GW afilY Y.1r t O O Qi to
IMMEDIATELY REMOVE SEDIMENT FROM THE FLOW AREA AND REPAIR THE , £c trrr �<,x+:c(N T:inlrvc 01'tt.NVe7•- :c3 RU&,I•f;VC4-o-t[W WAY An MO r I-M-00: � o O
r ry l -r ° SECTIONS S 1• PREPARE SOIL BEFORE INSTALLING BLANKETS, INCLUEJING ANY NECESSARY APPLICATION OF LIME, FERTILIZER, AND SEED. NOTE: W it - in
DIVERSION RIDGE. CAREFULLY CHECK OUTLETS AND MAKE TIMELY REPAIRS AS n_.wtrre :LTe;7gFS.7w '"Pi,•x,!!v,,A s:«._ 4. � vrn!av vEt/AAri Any rePLoopz-✓/tY TYPICAL I CAL DITCH TCH S O b AREA. CELL-O-SEED MUST BE INSTALLED WITH PAPER SIDE DOWN. r`
NEEDED. WHEN THE AREA PROTECTED IS PERMANENTLY STABILIZED, REMOVE t iEtNe•>+'`''+>"' <yV'Y�=L-zO !o mAR o�^"+"':' .o4t. se,^.s«%,r spyuzr, vl7!�Ev, WHEN USING CELL-O-SEED DO NOT SEED PREPARE � � O -4 N in
THE RIDGE AND THE CHANNEL TO BLEND WITH THE NATURAL GROUND LEVEL )vA51:�r7 2+r!RAcx v GVrb AYJft'PiGw S•!,---tYiY�P,'Sr gr!%-v0vn<,:u,4iL7l.A,C4 uo
AND APPROPRIATELY STABILIZE IT. NTS 2. BEGIN AT THE TOP OF THE CHANNEL BY ANCHORING THE BLANKET IN A 6" (15cm) DEEP X 6" (15cm) WIDE TRENCH
WITH APPROXIMATELY 12" (30cm) OF BLANKET EXTENDED BEYOND THE UP-SLOPE PORTION OF THE TRENCH. ANCHOR THE 1.15 STAPLES PER SO. YO. 1.7 STAPLES PER 50. YD. Z =Z o
n!-; ;ry;;.-•T.+i-n: BLANKET WITH A ROW OF STAPLES/STAKES APPROXIMATELY 12" (30cm) APART IN THE BOTTOM OF THE TRENCH. )BACKFILL (1.35 STAPLES PER 50 M) (2.0 STAPLES PER S0. M) to
r .:S; /: - it_/ ;.�.+•i r_+L :+ /' l AND COMPACT THE TRENCH AFTER STAPLING. APPLY SEED TO COMPACTED SOIL AND FOLD REMAINING 12" (30cm PORTION For blankets with the"optional North American For blankets with the",optional North American W ^
TEMPORARY DIVERSION BERM DETAIL ` �n7t'r1- !vOTrJSY:ALE)�-,7afr1.1 Y`i) OF BLANKET BACK OVER SEED AND COMPACTED SOIL, SECURE BLANKET OVER COMPACTED SOIL WITH A ROW OF STAPLES/STAKES
�Y ;:'tr V "L Green DOT System place staples/stakes Green DOT System ploce staples/stakes -
SPACED APPROXIMATELY 12" (30cm) APART ACROSS THE WIDTH OF THE BLANKET, throuqh each of the RED colored dots. through each of the GREEN colored dots. A z N Z O
NTS I 3, ROLL CENTER BLANKET IN DIRECTION OF WATER FLOW IN BOTTOM OF CHANNEL. BLANKETS WILL UNROLL WITH APPROPRIATE SIDE O O IJJ <O Z Z v
AGAINST THE SOIL SURFACE, ALL BLANKETS MUST BE SECURELY FASTENED TO SOIL SURFACE BY PLACING STAPLES/STAKES
IN APPROPRIATE LOCATIONS AS SHOWN IN THE STAPLE PATTERN GUIDE. WHEN USING OPTIONAL DOT SYSTEM~, STAPLES/STAKES *2"-5 (5cm-12.5cm)- `2' (o.6m •2'-5 (5cm-12.5cm) Aw, --•2"-5" (5cm-12.Scm) J O m Z
SHOULD BE PLACED THROUGH EACH OF THE COLORED DOTS CORRESPONDING TO THE APPROPRIATE STAPLE PATTERN. ) nr Z o O
4• PLACE CONSECUTIVE BLANKETS END OVER END (SHINGLE STYLE) WITH A 4"-6" (10cm-15cm) OVERLAP. USE A DOUBLE ROW OF Seam Stitch 10" (0.25m) CS in
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STAPLES STAGGERED 4" (10cm) APART AND 4" (10cm) ON CENTER TO SECURE BLANKETS. 4• (t,2r„)
4' (1.2+TT) Q 0 � � Seam Stitch"' ``aa�asslstttff4�
5. FULL LENGTH EDGE OF BLANKETS AT TOP OF SIDE SLOPES MUST BE ANCHORED WITH A ROW OF STAPLES/STAKES APPROXIMATELY
• 20" (O.Sm) � 10" (0.25+TT) � ��
12" (30cm) APART IN A 6" (15cm) DEEP X 6" (15cm) WIDE TRENCH, BACKFILL AND COMPACT THE TRENCH AFTER STAPLING. I` ,��� �H CAR ���
6. ADJACENT BLANKETS MUST BE OVERLAPPED APPROXIMATELY 2"-5" (5cm-12.5cm) (DEPENDING ON BLANKET TYPE) AND STAPLED. O T-3-T
FF.SS(
TO ENSURE PROPER SEAM ALIGNMENT, PLACE THE EDGE OF THE OVERLAPPING BLANKET BLANKET BEING INSTALLED ON TOP EVEN 20 (0.5�)( ) 3.3' (1.Om) ��
WITH THE COLORED SEAM STITCH'"ON THE BLANKET BEING OVERLAPPED. a ' F a t
7, IN HIGH FLOW CHANNEL APPLICATIONS, A STAPLE CHECK SLOT IS RECOMMENDED AT 30 TO 40 FOOT (9m-12m) INTERVALS. USE Q O 0 • • f r
A DOUBLE ROW OF STAPLES STAGGERED 4" (10cm) APART AND 4" (10cm) ON CENTER OVER ENTIRE WIDTH OF THE CHANNEL.
8. THE TERMINAL END OF THE BLANKETS MUST BE ANCHORED WITH A ROW OF STAPLES/STAKES APPROXIMATELY 12" (30cm) APART 0 0 0 P40 :FOB
IN A 6" (15cm) DEEP X 6" (15cm) WIDE TRENCH. BACKFILL AND COMPACT THE TRENCH AFTER STAPLING. r ���Ct I•' P�'•��`
A NOTE: STAPLES PER 0. YD. ,, fill
B C CRITICAL POINTS e HORIZONTAL STAPLE SPACING SHOULD BE ALTERED 3 4 STAPLES PER SO. YD. 3.t5 LEs E S
IF NECESSARY TO ALLOW STAPLES TO SECURE THE (4.1 STAPLES PER SO M) (4 5 STAPLES PER 50. M)
SILT FENCE BAFFELED FILTER BASIN A. OVERLAPS AND SEAMS CRITICAL POINTS ALONG THE CHANNEL SURFACE. For blankets with theoptional North American For blankets with the,"optional North American
B. PROJECTED WATER LINE Green DOT System place staples/stakes Green DOT System place stoples/stokes
C. CHANNEL BOfiTOM/SIDE •• IN LOOSE SOIL CONDITIONS. THE USE OF STAPLE through each of the WHITE colored dots. through each of the YELLOW colored dots.
A SLOPE VERTICES OR STAKE LENGTHS GREATER THAN 6" (15 cm) MAY V
CONSTRUCTION SPECIFICATIONS aArFu fTw.1 tt a BE NECESSARY TO PROPERLY ANCHOR THE BLANKETS. *Location of Seam Stitchm will vary depending on North American Green product type: ,_,a
1. CLEAR, GRUB, AND STRIP THE AREA UNDER THE EMBANKMENT OF ALL VEGETATION AND ROOT MAT. REMOVE ALL SURFACE SOIL F�0 C
CONTAINING HIGH AMOUNTS OF ORGANIC MATTER AND STOCKPILE OR DISPOSE OF IT PROPERLY. HAUL ALL OBJECTIONABLE MATERIAL EARTH BERM J
TO THE DESIGNATED DISPOSAL AREA. 14649 HIGHWAY 41 NORTH, EVANSVILLE, INDIANA 47725 PERMANENT SEEDING a
USA 1-800-772-2040 CANADA 1-800-448-2040 O
2. ENSURE THAT FILL MATERIAL FOR THE EMBANKMENT IS FREE OF ROOTS, WOODY VEGETATION, ORGANIC MATTER, AND OTHER www.nogreen.com --
OBJECTIONABLE MATERIAL. PLACE THE FILL IN LIFTS NOT TO EXCEED 9 INCHES AND MACHINE COMPACT IT. OVER FILL THE
EMBANKMENT 8 INCHES TO ALLOW FOR SETTLEMENT. `
CHANNEL INSTALLATION SEEDING MIXTURE ¢ - � '
3. CONSTRUCT THE OUTLET SECTION IN THE EMBANKMENT. PROTECT THE CONNECTION BETWEEN THE RIPRAP AND THE SOIL FROM SPECIES RATE(LB/ACRE) V V) CI In
PIPING BY USING FILTER FABRIC OR A KEYWAY CUTOFF TRENCH BETWEEN THE RIPRAP STRUCTURE AND THE SOIL `\` �� �`
A) PLACE THE FILTER FABRIC BETWEEN THE RIPRAP AND SOIL. EXTEND THE FABRIC ACROSS THE SPILLWAY FOUNDATION AND NORTH AMERICAN GREEN TALL FESCUE 100 � - o?
SIDES TO THE TOP OF THE DAM OR SERICEA LESPEDEZA 30 to 0 ^I
n4ET 1DrE KOBE LESPEDEZA 1O Q
8) EXCAVATE A KEYWAY TRENCH ALONG THE CENTERLINE OF THE SPILLWAY FOUNDATION EXTENDING UP THE SIDES TO THE Hoo Trr+E ATTACHED `` 35%OF SUPTACE N.T.S. 10
HEIGHT OF THE DAM. THE TRENCH SHOULD BE AT LEAST 2 FT DEEP AND 2 FT WIDE WITH 1:1 SIDE SLOPES. To Posts SUER LENGTH!; AREA
or waE HCMZONTAL METAL P05T ``
WRLD 3000Rnt TO VERTICAL ` ` FIRST CHAMBER f'1 F�1
4. CLEAR THE POND AREA BELOW THE ELEVATION OF THE CREST OF THE SPILLWAY TO FACILITATE SEDIMENT CLEANOUT. Rusts M or SURFACE AREA SEEDING NOTES 0 �%
5. ALL CUT AND FILL SLOPES SHOULD BE 2:1 OR FLATTER. BAFFLE INSTALLATION - STEP 1 SECOND CHAMBER 1. IN EASTERN PIEDMONT ADD 25 LB/ACRE PENSACOLA BAHIAGRASS OR 10 Z X
CUSS M RIP RAP
25%OF SURFACE AREA
6. ENSURE THAT THE STONE (DRAINAGE) SECTION OF THE EMBANKMENT HAS A MINIMUM BOTTOM WIDTH OF 3 FT AND MAXIMUM WTLET 7otc LB/ACRE COMMON BERMUDAGRASS. USE COMMON BERMUDAGRASS ONLY LU L..
SIDE SLOPES OF 1:1 THAT EXTEND TO THE BOTTOM OF THE SPILLWAY SECTION. taTcr 'S1 cF S1Pr•� "E WHERE IT IS UNLIKELY TO BECOME A PEST.
t.DRIVE S STEEL POST AT LEAST 24' 2. AFTER AUG. 15 USE UNSCARIFIED SERICEA SEED. �" T_
INTO 50LU CAOUNO
7. CONSTRUCT THE MINIMUM FINISHED STONE SPILLWAY BOTTOM WIDTH, AS SHOWN ON THE PLANS, WITH 2:1 SIDE SI MS z.USE STAPLES I APART HORrzONTALLv 3. WHERE A NEAT APPEARANCE IS DESIRED, OMIT SERICEA AND SUBSTITUTE 0 � .y
EXTENDING TO THE TOP OF THE OVER FILLED EMBANKMENT. KEEP THE THICKNESS OF THE SIDES OF THE SPILLWAY UCHIET AND VERnca E"To ATTACH THE
PND V TI ALL Hoc ATTACH
40 LB/ACRE BAHIAGRASS OR 15 LB/ACRE BERMUDAGRASS.
STRUCTURE AT A MINIMUM OF 21 INCHES. THE WEIR MUST BE LEVEL. AND CONSTRUCTED TO GRADE TO ASSURE OESICN CAPACITY. 3 FACE T.E toArTLES Acconma°TO PERSPECTIVE VIEW O
,HE APPRo.•cD PLAN PENCE AND rAePTc 4. TO EXTEND SPRING SEEDING DATES INTO JUNE. ADD 15 LB/ACRE HULLED N
4 THE►LOOR Or THE 9 114 Rn Tr[ BUREO a TRENCH
S. MATERIAL USED IN THE STONE SECTION SHOULD 8E AWELL-GRADED MIXTURE OF STONE WITH A d50 SIZE OF g INCHES (CLASS A[aoa.TacEt rTER
0 TDP Ix BAFFLE SHOULD BE a BERMUDAGRASS. HOWEVER, IT IS PREFERABLE TO SEED TEMPORARY COVERLU
8 EROSION CONTROL STONE IS RECOMMENDED) AND A MAXIMUM STONE SIZE OF 14 INCHES. THE STONE MAY BE MACHINE PLACED THE SAS►.IS CIA TA9CTV0 BEL°R THE TOP a rHE EKRM AND SEED FESCUE IN SEPT.
AND THE SMALLER STONES WORKED INTO THE VOIDS OF THE LARGER STONES. THE STONE SHOULD BE HARD, ANGULAR, AND a.a mEtrcH.
HIGHLY WEATHER-RESISTANT. BACRnLtED AND
coMPAcrco NURSE PLANTS
•The msd of using a skimmer system era similar,of tTccnrsionnlly Icss,than
9. ENSURE THAT THE STONE SPILLWAY OUTLET SECTION EXTENDS DOWNSTREAM PAST THE TOE OF THE EMBANKMENT UNTIL STABLE a conventional rack outlet or perforated rim However,the basin is more
CONDITIONS ARE REACHED AND OUTLET VELOCITY IS ACCEPTABLE FOR THE RECEIVING STREAM. KEEP THE EDGES OF THE STONE Q :an
in removing sediment Another advantage of the skimmer is that it BETWEEN MAY 1 AND AUG. 15, ADO 10 LB/ACRE GERM AN MILLET OR 15
OUTLET SECTION FLUSH WITH THE SURROUNDING GROUND AND SHAPE THE CENTER TO CONFINE THE OUTFLOW STREAM. _ can be reused on fimne projects the main disadvantage of the skimmer is LB/ACRE SUDANGRASS. PRIOR TO MAY 1 OR AFTER AUG. 15, ADD 40
BAFFLE INSTALLATION - STEP 2 •De..alaier-Allow the muimomreroa.Me detention perlodbelorsthe that it does require frequent maintenance,primarily in removing debris From
10. DIRECT EMERGENCY BYPASS TO NATURAL„ STABLE AREAS. LOCATE BYPASS OUTLETS SO THAT THE FLOW WILL NOT DAMAGE THE best"ycoinplretrd-st�e(at lr„t24eeer') theinlec LB/ACRE RYE (GRAIN)
•Infl-tale-RedRm the klllow velocity And dived all sedhnent-free
EMBANKMENT. outface
SILT FENCE BAFFELED FILTER BASIN ' ' skimmer
ngmusdewaller the
be
from thetopOft w.of24to7 tussIe
11. STABILIZE THE EMBANKMENT AND ALL DISTURBED AREAS ABOVE THE SEDIMENT POOL. AND DOWNSTREAM FROM THE TRAP re aired Ling must m r design
A ewstets ro time e u to a hours b SEEDING DATES
required Arty skimmer detlRrd that dedwtna room the surface at■con- BEST POSSIBL
IMMEDIATELY AFTER CONSTRUCTION. trolled rate M acceptable.
12. SHOW THE DISTANCE FROM THE TOP OF THE SPILLWAY TO THE SEDIMENT CLEANOUT LEVEL (ONE-HALF THE DESIGN DEPTH) ON Pke view FALL: AUG. 25 - SEPT. 15 AUG. 20 - OCT. 25
THE PLANS AND MARK IT IN THE FIELD.
•„y I p ,
"^ 4 LATE WINTER: JULY 25 - AUG. 15 FEB. 1 - APR. 15 F••�
INSPECT TEMPORARY SEDIMENT TRAPS AFTER EACH PERIOD OF SIGNIFICANT RAINFALL REMOVE SEDIMENT AND RESTORE THE TRAP
TO ITS ORIGINAL DIMENSIONS WHEN THE SEDIMENT HAS ACCUMULATED TO ONE-HALF THE DESIGN DEPTH OF THE TRAP. PLACE Inflow tl A,�,A„a„bh FALL IS BEST FOR TALL FESCUE AND LATE WINTER FOR LESPEDES V � Q
THE SEDIMENT THAT IS REMOVED IN THE DESIGNATED DISPOSAL AREA AND REPLACE THE CONTAMINATED PART OF THE GRAVED O EFFECTIVE.
OF KOBE LESPEDEZA OVER FALL-SEEDED FESCUE IS VERY ram+
FACING. \ 1,1�I,.;,Ll.�' ' EFFECTIVE. USE UNHULLED BERMUDAGRASS SEED IN FALL. 0
Il - U ...)
CHECK 1HE STRUCTURE FOR DAMAGE FROM EROSION OR PIPING. PERIODICALLY CHECK THE DEPTH OF THE SPILLWAY TO ENSURE ��'� 4t- •c•ErrckTsaa
IMMEDIATELY FILL ANY SETTLEMENT OF THE 'r' ' SOIL AMENDMENTS
IT IS A MINIMUM OF 1.5 FT BELOW THE LOW POINT OF THE EMBANKMENT. Irk s t' '
EMBANKMENT TO SLIGHTLY ABOVE DESIGN GRADE. ANY RIPRAP DISPLACED FROM THE SPILLWAY MUST BE REPLACED IMMEDIATELY. ti, fir'
a � � H Water Eery APPLY LIME AND FERTILIZER ACCORDING TO SOIL TESTS, OR APPLY 4,000 Q
N AREAS HAVE BEEN PERMANENTLY STABILIZED, REMOVE THE STRUCTURE AND ALL UNSTABLE PERSPECTIVE VIEW unit
G S ); ,�iT. eRwyaerr LB/ACRERGROUND AGRICULTURE LIMESTONE AND 1,000 LB/ACRE 10-10-10 U
AFTER ALL SEDIMENT PRODUCT E
SEDIMENT. SMOOTH THE AREA TO BLEND WITH THE ADJOINING AREAS AND STABILIZE PROPERLY, t�itq ' ! apakey pvCErd PVCEIbow PVC
Schedule 40 FERTILIZER.
(�
fh1.�j � Cap � PVC Pipe v O
W dth W ''L . I r MULCH
PVC End W � O
.A,.eetaolie.et.aFfnc,al / CapPVC
APPLY 4,000-5,000 LB/ACRE GRAIN STRAW, OR EQUIVALENT COVER OF Q
tap of prnelpei ng9key eNmnen schedule 40 ANOTHER SUITABLE MULCHING MATERIAL. ANCHOR MULCH BY TACKING WITH [� n"
Tee PVC Pipe PVC Pipe ASPHALT, ROVING, OR NETTING. NETTING IS THE PREFERRED ANCHORING 7-
PVC
}'Holes In � PVC Tee Or ifltt �T �
Utder•sidt Flexible plate METHOD ON STEEP SLOPES. ".4 V) ►Q LLJ
How p o
Inflow n.a �� r FrnteArd r-
MAINTENANCE
.._. \ Bohan SurfaceEwittawl >
REFERTILIZE IN THE SECOND YEAR UNLESS GROWTH IS FULLY ADEQUATE. MAY
END VIEW FRONT VIEW BE MOWED ONCE OR TWICE A YEAR, BUT MOWING IS NOT NECESSARY. RESEED.
FERTILIZE, AND MULCH DAMAGED AREAS IMMEDIATELY.
erap1 to Crroa-Se a, ^ z z,
S� 1• SAP 3• N�� � Figure B.ti1a Schematic of a akknmer,from Pennsylvania Erosion mid Sediment Pollution Control Manual,
DRIVE STEEL POSTS 18' INTO GROUND ATTACH WIRE FENCE TO POSTS AND ATTACH THE FILTER FABRIC TO THE WIRE CONSTRUCTION SPECIFICATION
Meroh,2000 TEMPORARY SEEDING Q
AND EXCAVATE A 8' X 8" TRENCH UPHILL EXTEND THE BOTTOM OF THE FENCE FENCE AND EXTEND THE BOTTOM OF THE flpRaasde FsaTnt da socion Conabrhwah a SkiMorc r20 0 and eTtelYwwY ad3way Frran Pennsylvania n.y+
ALONG THE LINE OF POSTS. 8" INTO THE EXCAVATED TRENCH. FABRIC 8" INTO THE TRENCH. 1. USE A SYNTHETIC FILTER FABRIC OR A PERVIOUS SHEET OF POLYPROPYLENE, bon on AndFeeen►ntponRbnCabotManusl,klaeh,2D0o ►.�.s
NYLON, POLYESTER, OR POLYETHYLENE YARN, WHICH IS CERTIFIED BY THE SEEDING MIXTURE
MANUFACTURER OR SUPPLIER AS CONFORMING TO THE REQUIREMENTS SHOWN SPECIES RATE(LB/ACRE) W
BLOW. aN.a aw aaa
RYE (GRAIN) 120
SYNTHETIC FILTER FABRIC SHOULD CONTAIN ULTRAVIOLET RAY INHIBITORS AND
STABILIZERS TO MAX. 8' CONSTRUCTION LIFE AT A TEMPE A IERATURE RANGE OF 0 TO 11207.MUM OF 6 MONTHS OF D USABLE
SEEDING DATES
BETWEEN SKIMMER ARM DETAIL
2. ENSURE THAT POSTS FOR SEDIMENT FENCES ARE EITHER 4-INCH DIAMETER SEDIMENT TRAP DETAIL WITH SKIMMER ARM MOUNTAINS--AUG. 15 - DEC. 15
PINE, 2-INCH DIAMETER OAK, OR 1.33 Ib/UNEAR FT. STEEL WITH A MINIMUM N.T.S
LENGTH OF 4 FT. MAKE SURE THAT STEEL POSTS HAVE PROJECTIONS TO NJ.S COASTAL PLAIN AND PIEDMONT--AUG. 15 - DEC. 30
;\ice \ FACILITATE FASTENING THE FABRIC.
4S /`�% /�'// SOIL AMENDMENTS FILENAME
•d* O'� ;�. 6 r►�' 0� / \\i\\i `�*O'� / /\•i�i\;! 3. FOR REINFORCEMENT OF STANDARD STRENGTH FILTER FABRIC, USE WIRE NOTES:
; g /\\/\\/\\�\\. / //\//\\//\���\y/\ FENCING WITH A MINIMUM 14 GAUGE AND A MAXIMUM MESH SPACING OF 6 PLACE RIP-RAP AROUND PIPE AS DIRECTED
/ /�l/ /`�\��\\.�\`�` INCHES.
BY THE ENGINEER. FOLLOW SOIL TESTS OR APPLY 2,000 LB/ACRE GROUND AGRICULTURE
LIMESTONE AND 1000 LB/ACRE 10-10-10 FERTILIZER.
DESIGNED BY
STEP 4: PHYSICAL PROPERTY TENTS VWS
BACKFILL THE TRENCH AND COMPACT
THE SOIL FIRMLY TO ANCHOR THE FILTERING EFFICIENCY 85X (MIN)
MULCHDRAWN BY
BOTTOM OF THE SILT FENCE SO THAT SECTION
RUNOFF IS FORCED TO GO THROUGH THE TENSILE STRENGTH AT STANDARD STRENGTH- APPLY 4,000 LB/ACRE STRAW. ACHOR STRAW BY TACKING WITH ASPHALT, PJR
FENCE AND CANNOT GO UNDER IT. WIRE FENCE "HOG WIRE' T Do FLOW 3DO W NETTING, OR A MULCH ANCHORING TOOL. A DISK WITH BLADES SET NEARLY
STEEL POSTS (14 GAUGE PITH MAX. 20X (MAX.) ELONGAl10N 30 Ib./Iln IN (MIN) DO M STRAIGHT CAN BE USED AS A MULCH ANCHORING TOOL SCALE
MESH SPACING . 6 IN. EXTRA STRENGTH- + AS NOTED
BBOTTOM OF FILTER MUST 50 Ib/lln IN (MIN) 07. GRAD
FILTER FABRIC SEE BE PLACED IN TRENCH MAINTENANCE DATE
HEIGHT: SPECS. FOR MATERIAL AND SECURED BY PLACING SLURRY FLOW RATE 0.3 gal/sq ft/min (MIN) I-I I 2/25/08
r,y MAX. 3' WASHED STONE TO A HEIGHT OF -III=
MIN. 2' BOTTOM OF WIRE FENCE AND 6' ABOVE GROUND LEVEL. _ REPAIR AND REFERTILIZE DAMAGED AREAS IMMEDIATELY. TOPORESS WITH 50
FILTER FABRIC BURIED 8' IN SYNTHETIC FILTER III- (-)I LB/ACRE OF NITROGEN IN MARCH. IF IT IS NECESSARY TO EXTEND
EXCAVATED TRENCH. FABRIC (AS PER NCOOT I;III=- III= TEMPORARY COVER BEYOND JUNE 15. OVERSEEO WITH 50 LB/ACRE KOBE �
INSPECT SEDIMENT FENCES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL.
MAKE ANY REQUIRED REPAIRS IMMEDIATELY. SPEC. p1o56 TYPE> 2) ;I I - _ (PIEDMONT AND COASTAL PLAIN) OR KOREAN (MOUNTAINS) LESPEDEZA IN
=11EE = III= 1=I= - - I I(-III RIP-RAP La LATE FEBRUARY OR EARLY MARCH.
P - 6
'1 I.I I -1111-_11111 111- Ex. GROUND - SEE SCHEDULE _
II-III-III_ SIM POST DRIVEN SHOULD THE FABRIC OF A SEDIMENT FENCE COLLAPSE, TEAR, DECOMPOSE D
" BECOME IN EFFECTIVE. REPLACE IT PROMPTLY. REPLACE BURLAP EVERY 60 DAYS.
.III =I I H I k=' 18 INTO GROUND
L-
/`\//v//\////v/\\ REMOVE SEDIMENT DEPOSITS AS NECESSARY TO PROVIDE ADEQUATE STORAGE OUTLET IN 3Do La W RIPRAP BY
VOLUME FOR THE NEXT RAIN AND TO REDUCE PRESSURE ON THE FENCE. TAKE NUMBER (IN) (FT) (FT) (F-0 CLASS NO. DATE REVISION DESCRIPTION Joe/ _
CARE TO AVOID UNDERMINING THE FENCE DURING CLEANOUT. e 12 7 2 2
1 48 12' 26' 30' II
REMOVE ALL FENCING MATERIALS AND UNSTABLE SEDIMENT DEPOSITS AND BRING RIP-RAP OUTLET PROTECTION DETAIL
THE AREA TO GRADE AND STABILIZE IT AFTER THE CONTRIBUTING DRAINAGE AREA I"'^
NTS
SILT FENCE DETAIL HAS BEEN PROPERLY STABILIZED.
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