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Home My WebLink About20070665 Ver 2_More Info Received_20080630Estes Deli Inc, Environmental Design & Consulting *0*446 June 27, 2008 Mr. Joseph Gyamfi North Carolina Department of Environment and Natural Resources Division of Water Quality 2321 Crabtree Boulevard, Suite 250 Raleigh, NC 27604 RE: DWQ EXP No. # 07-0665v2 (old #05-1920) Marvin Ridge Middle School & High School, Union County, NC (New Middle and High School B, Crane Road, Waxhaw, NC) Dear Mr. Gyamfi, In response to your letter of June 20, 2008, requesting additional information regarding the Stormwater Management Plan, we are sending you the enclosed revisions with the information requested. We have updated the drawings (see Sheets SD.05, SD.05 and SD.07) to show the rip-rap aprons stabilizing the inlets and outlets at each pond. Attached you will find our calculations, sizing the aprons for the 10-year storm. On Sheet SD.08, we have updated the details of the channels for the level spreader and bypass at the outlet of Pond 3, including reinforcing matting under the grass-lined channel. Attached you will find our calculations for the bypass channel sizing for the 10-year storm. We have updated the construction sequence on Sheet EC.02 to describe the procedures for constructing the ponds while controlling the stormwater during the project. We have also updated Sheet EC.01 to reflect the additional erosion control measures noted in the construction sequence. It was a pleasure to meet you at the LID Summit in Asheville earlier this week. Should questions arise during your review of this project, please give us a call. c ely • Christophe . Estes, A President Enclosures D ??? I cc: Debbie Green, Union County Public Schools Eddie MacEldowney, Davis-Martin-Powell & Associates !'Np L' VVE! LANDS AK; • P.O. Box 79133 Chartotte, N.C. 28271-7050 • Phone (704) 841-1779 Fax (704) 841-1842 • Estes Desion inc. Environmental Design & Consulting Marvin Ridge Schools DWQ EXP No. 07-0665v2 Calculations for Additional Information Requested June 27, 2008 A. Inlet & Outlet Protection B. Pond 3 Bypass Channel (05'Rq N K E • P.O. Box 79133 Charlotte, N.C. 28271-7050 * Phone (704) 841-1779 Fax (704) 841-1842 • Marvin Ridge Schools 61252008 WQ POND 2 - INLET & OUTLET PROTECTION INLETS (Forebay) A. 60" Culvert (Parking Lot) 10-Year Peak Discharge: Invert Elevation: Permanent Pond Elevation: Peak Elevation, 10-Year Storm: From Nomograph: (minimum tailwater controls) Mean Rip-Rap Diameter, dso = Max Rip-Rap Diameter, d,,,. = 1.5 x dso = Depth of Apron, dA = 1.5 x d„,,,, = Length of Apron, LA = Outer Width of Apron, WA = LA + Diamp;p, = B. 15" Culvert (MS Athletic Field) 10-Year Peak Discharge: Invert Elevation: Permanent Pond Elevation: Peak Elevation, 10-Year Storm: From Nomograph: (maximum tailwater controls) Mean Rip-Rap Diameter, dso = Max Rip-Rap Diameter, d11187 = 1.5 x dso = Depth of Apron, dA = 1.5 x d,,. = Length of Apron, LA = Outer Width of Apron, WA = LA + Diamp;p, = OUTLET (Pond Structure) C. 28" Culvert (Primary Outlet) 10-Year Peak Discharge: Free Discharge, Invert Elevation: From Nomograph: (minimum tailwater controls) Mean Rip-Rap Diameter, d6o = Max Rip-Rap Diameter, dn. = 1.5 x dso = Depth of Apron, dA = 1.5 x d,,. = Length of Apron, LA = Outer Width of Apron, WA = LA + Diamp;p, = 104.51 cfs 572.53 ft 573.00 ft 576.30 ft 0.35 ft 4.2 in 0.525 ft 6.3 in 0.79 ft 9.45 in 9ft 14 ft 7.12 cfs 572.00 ft 573.00 ft 576.30 ft 0.1 ft 1.2 in 0.15 ft 1.8 in 0.23 ft 2.7 in 9ft 10.25 ft 47.96 cfs 569.50 ft 0.75 ft 9 in 1.125 ft 13.5 in 1.69 ft 20.3 in 21 ft 23.5 ft Marvin Ridge - Inlet/Outlet Protection WQP2 Marvin Ridge Schools 612WO08 WO POND 2a - INLET & OUTLET PROTECTION INLET (Forebay) A. 30" Culvert 10-Year Peak Discharge: Invert Elevation: Permanent Pond Elevation: Peak Elevation, 10-Year Storm: From Nomograph: (minimum tailwater controls) Mean Rip-Rap Diameter, d5o = Max Rip-Rap Diameter, d,,,. = 1.5 x d5o = Depth of Apron, dA = 1.5 x d,a„ = Length of Apron, LA = Outer Width of Apron, WA = LA + Diam„;, = OUTLET (Pond Structure) B. 30" Culvert (Primary Outlet) 10-Year Peak Discharge: Free Discharge, Invert Elevation: From Nomograph: (minimum tailwater controls) Mean Rip-Rap Diameter, d5o = Max Rip-Rap Diameter, d,,. = 1.5 x d5o = Depth of Apron, dA = 1.5 x d,A„ = Length of Apron, LA = Outer Width of Apron, WA = LA + Diampp, = 38.97 cfs 573.00 ft 573.00 ft 575.42 ft 0.5 ft 6 in 0.75 ft 9 in 1.13 ft 13.5 in 18 ft 20.5 ft 10.65 cfs 569.50 ft 0.3 ft 3.6 in 0.45 ft 5.4 in 0.68 ft 8.1 in 9ft 11.5 ft Marvin Ridge - Inlet/Outlet Protection WQP2a Marvin Ridge Schools 6/25 2008 WQ POND 3 - INLET & OUTLET PROTECTION INLETS (Forebay) A. 60" Culvert (Athletic Fields, etc) 10-Year Peak Discharge: Invert Elevation: Permanent Pond Elevation: Peak Elevation, 10-Year Storm: From Nomograph: (minimum tailwater controls) Mean Rip-Rap Diameter, d5o = Max Rip-Rap Diameter, d. =1.5 x d5o = Depth of Apron, dA = 1.5 x dmax = Length of Apron, LA = Outer Width of Apron, WA = LA + Diamp,, = B. 30" Culvert (Roofs, Parking) 10-Year Peak Discharge: Invert Elevation: Permanent Pond Elevation: Peak Elevation, 10-Year Storm: From Nomograph: (maximum tailwater controls) Mean Rip-Rap Diameter, d5o = Max Rip-Rap Diameter, d,. = 1.5 x d50 = Depth of Apron, dA = 1.5 x d,,. = Length of Apron, LA = Outer Width of Apron, WA = LA + Diampp, = OUTLETS (Pond Structure/Splitter Box) C. 11" Orifice (Level Spreader) 113.69 cfs 579.00 ft 572.00 ft 575.31 ft 0.4 ft 4.8 in 0.6 ft 7.2 in 0.9 ft 10.8 in 10.5 ft 15.5 ft 26.25 cfs 573.00 ft 573.00 ft 575.31 ft 0.35 ft 4.2 in 0.525 ft 6.3 in 0.79 ft 9.45 in 10 ft 12.5 ft 10-Year Peak Discharge: 3.87 cfs Free Discharge, Invert Elevation: 569.00 ft From Nomograph: (minimum tailwater controls) Mean Rip-Rap Diameter, d5o = 0.2 ft 2.4 in Max Rip-Rap Diameter, d,,,.x = 1.5 x d50 = 0.3 ft 16 in Depth of Apron, dA = 1.5 x dm,. = 0.45 ft 5.4 in Length of Apron, LA = 8 ft Outer Width of Apron, WA = LA + Diamp, = 9 ft D. 48" Culvert (Bypass Channel) 10-Year Peak Discharge: 80.52 cfs Free Discharge, Invert Elevation: 569.00 ft From Nomograph: (minimum tailwater controls) Mean Rip-Rap Diameter, d50 = 0.4 ft 4.8 in Max Rip-Rap Diameter, dmm = 1.5 x d50 = 0.6 ft 7.2 in Depth of Apron, dA = 1.5 x dmax = 0.90 ft 10.8 in Length of Apron, LA = 12 ft Outer Width of Apron, WA = LA + Diampp. = 16 ft Marvin Ridge - Inlet/Oudet Protection WQP3 Outlet N ' OO + La pipe diameter (Do) T il++ater < 0.500 PPjox? w 50. am 20 10 .. 3 5 Curves may not be,extrapolated. 90 - 80 . •,.., 50 100 Discharge (tt3/sec) Design Of Riprap Apron Under Minimum Tailwater Conditions Figure 8-1 8-5 4 - YA.,x1* 3 tz n_ O -1 a -10 1000 Stnon F' titer Sen•ave- Marvin Ridge Schools BYPASS CHANNEL SIZING DA-3/POND 3 DISCHARGE WQ POND 3 (Modeled with HydroCAD) A. Outlet Structure Discharge for 10-Year Storm B. Drawdown Rate for Temporary Storage (WQ) Volume Flow Diverted to Bypass Channel (A - B ) Flow to Level Spreader BYPASS CHANNEL (Modeled with Flow Master) Flow Volume Bottom Width Side Slopes Mannings Coefficient - grassed channel: n = Depth of Flow Flow Velocity < 6 flYsec OK for Grass 84.39 cfs 3.87 cfs 80.52 cfs 3.87 cfs 6125%2008 80.52 cfs 3ft 2 :1 0.030 2ft 5.77 ftfsec Marvin Ridge - Bypass POND 3 - BYPASS CHANNEL (10-YR) Worksheet for Trapezoidal Channel Project Description Worksheet Trapezoidal Channe Flow Element Trapezoidal Channe Method Manning's Formula Solve For Channel Depth Input Data Mannings Coeffic 0.030 Slope 011000 tuft Left Side Slope 2.00 H : V Right Side Slope 2.00 H : V Bottom Width 3.00 ft Discharge 80.52 cfs Results Depth 2.00 It Flow Area 14.0 fe Wetted Perime 11.93 ft Top Width 10.98 ft Critical Depth 1.90 ft Critical Slope 0. 013690 ft/ft Velocity 5.77 ft/s Velocity Head 0.52 ft Specific Energ 2.51 ft Froude Numbe 0.90 Flow Type Subcritical Project Engineer: EDI zA...\0721 marvin ridge\models\da3 bypass.fm2 RowMaster v6.1 [614o] 06/25/08 02:20:44 PM 0 Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA (203) 755-1666 Page 1 of 2 Cross Section Cross Section for Trapezoidal Channel Project Description Worksheet Trapezoidal Channe Flow Element Trapezoidal Channe Method Manning's Formula Solve For Channel Depth Section Data Mannings Coeffic 0.030 Slope 011000 It/ii Depth 2.00 ft Left Side Slope 2.00 H : V Right Side Slope 2.00 H : V Bottom Width 3.00 ft Discharge 80.52 cis 2.00 I't .00 V:1 L H:1 NTS Project Engineer: EDI z:\...\0721 marvin ridge\modeis\da3 bypass.fm2 FlowMaster v6.1 [614o] 06/25/08 02:20:44 PM 0 Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA (203) 755-1666 Page 2 of 2 1~ ~ ~ \ i J Jar ~ ~ ~x - " \ , _ _ t p"~ ~ / x~. - ~ .i / , _ ~ J i _ _ / _ _ _ , - _ _ ~ y/ \ ~ I - ~ I ~ E 1~ _ ~ k Permanent ~V~ Peal Vc,lur~e { I : { Use 573.0 Perrr, Pond Elev; decluN. far sediment s,orage l .-r-~,..,~- ~ ~r, \ T~f~le 10-3: SA1D~, =Ratio far 1`SS Rem~rvaP ; i!-- ~;~1 _ ~ x .r.-- "'e'" ; / i Far 53.7% It--t eE'v ~ Av D - 4.16 , r- a _ , t - i ~ 1 _ \ ~ ~ i - - _ I \ ~ ~ , _ x atia Required Surface Area, DA R _ _ _ _ ~ ; _ , - ~ fog ~ , ; ~ ,:,-.r. ~ ~ r ' ' 733,49i.o ~r x O.utrc 78+x.5 ~F Re~ d Dei r-~. D _1-----'- J ~ ~J ~ ~ ~ { 11- - - ~ , . _ _ : , - Tv~ ;-'r-- x Re~qutred tN Velume - , _ « _ - ,i _ _ Vn r , _ ` ` Jt~ X 1i'vs~ G~4~tife - 's`v'Ix; ~i~i. ~.~;k~ i. vl" r-t~~ia ~~SIJfi. 1~ - 1 f - _ _ _ a ` ~ C-l /t ~ ~pr , " , o~ I ~ , ~ Temporary Storage ;/plume ~ , _ _ ~ , ~ _ ~ Sim fe Method 3.3. ~ Canfrol , Ratnfatl Rd - p - Required Vaiurne; V 3630 x Rd x ~Rv-O.Q D ) . ® _ I 0 _ _ Im en~ous ro la = 58.7% p ~ _ _ Runoff Factor: Rv = 0.5782 _ I ~c Required Temporary Storage Volume: . _ _ I , . V = 37 751.4 CF Regd Design: GF Erev = 575 _ ~ - . ~ - o ~ : ~ ~ _ n , ~ _ ~ ~ Forebay Volume ~ _ I, . - Approx 20% of VUQ Val ~ ~ _ ~ _ ~ a F - a Approx Forebay Volume: - 18,112.2 CF Regd Design. _ CF 19.5,fn _ ,I ~ _ { _ - ~ _ I ,3 _ ~-~.a _ , ~ ~ T-... - , _ - - 1 \ ` 4~ _ _ ' ~ ~ r ' n _ POND 2 - 90V/o TSS REMOVAL Q ap~oQO6ogp,~s ~ ~a. 4 ~ moo. ~ ~..TM. ~ ~ T , ; opp ~ d~' ~ Tf- P - N~ ~ ~ Sur# P,rea Incremental Currnrlative Av Depth Te. Stara e ~;P'' 9 ~ g - ,v~ - ' I o ~ ~s . ~ ~ Ft CuFt CuFt Ft CuFt o a p - ` . . \ J ~ l~aftan~ of panel 562.0 835: ' - I ~ I . _ _ a ~ / `y - i 563,0 1,254 1,045= allai~ ~ ft ~a{ sedrmer~t i I x 564.fl 2,189 1, 722: 1,722; } 0~ _ 1565.0 3621 2,905 4,627 ~ , , ry, _a , , - 566.0 5 014 ` 4 318; ~ 944 , ~ ~ 567, 0 6 562 5 788 14 732 F , ~ . _ . w. _ ~ . , - , ,,i " ~ " i I 8 296 7 429 22161 rn 568.0 , x ~ , 7 ~ _ F _ ~ - 569.0 10,209; 9,253; 31,414: I J-- - ` ~ . . , ' \ 4 7` ..r" ~ ~ - \ ~ \ , V A \ ; l I 570.0 12,458 11,33 42 74 e x _ . ~ ~ ~ ..r-~' _U- _ \ ' I 571.0 14,752 13.605 56 352' _ . _ I ~ \ ~ ; 17 1 5 984 72 336' x 572.0 ,2 6 1 , _ _ = , i I ~ C, „ ~ _ _ I 572.5 18,488':_ 8,926: 81,262! 4.4D - U , _ _ _ _ \ ~ _ I _ < r 573,Q 21,97? 10,11E 91,378 4.16 Per~rrar~er~f Par~e~~~ev ~ I ~ 1~ ~ ` Q 573,5 25,632 11,902. 103,280 11,902 \ I i Q ~ - ~ ~ ~r I . ~ 1 11 47 25 098 I 574.0 27,151 3,190 6, 6 , \ 1 i \ . ~ \ I ~ 4 - I , 53,844 Te~~npar~ty Starac~e \ ~ 575.0 30,341 28,740 14~,222t ~ _ _ __w 576.0 33,442 31,892 177,1141 85,736 < ? ft ~iee~aerd I _ ~ - ~ / ; ~ \ Surf Area Incremental Cumulative Avg rJepti~ ~ ~ ~ S Ft CuFt CuFt Ft , ~ 564,0 333! ' < fao~tom of far~e~ey 595. _ 595 565,0 586-: 460; 460 ~ ~ _ 590 _ 594 _ > - 567.0 ' 1,190:,.. 1 031 ; 2 220 _ _ FGR_ BAY. BERM _WQ POND _ _ _ _ _ ~ _ ~:1 SdDES 2:1 SIDES: 3,1 SIDES _ , 585 _ 585 568.0 1,565; 1,378' 3,597; ~ _ . w . C 569.0; 1,981 1,773> 5,370; w _ _ _ _ ~ ~ ~ ~ ~ J _ _ - _ _ _ 580 - _ j _ _ _ _ ~ _ 580 _ _ _ _ _ . 570.0 2,589; 2,285; 7,655`. ;4 _ _ - ~ , 571.0 3,117 , ~ 1 ,4 _ - 575 _ _ . _ j _ : , _ _ _ _ . 575 ~ ~ 572.0 ~ 3,673: 3,395.. 13,903; \ _ _ ~ ~ ~ ~ o~, 5~2.a 3,965: 1,910 1.813:, _ _ .A . _ . 570 _ _ _ _ _ :570 _ :EXIST. 60"RCP.... 24'' ~ ~ ~ 573.E 4 257, 2 0~0: 17 868 19.6/0 ~ ~er~r~~r~enf ~'a~~~ Kiev ~ ~ ' _ _ _ _ _ _ ~ a 2 205 20 073 _ _ _ _ ST(~f~M DRAIN _ CPP _ _ 565 _ _ _ _ _ : _ _ _ _ 565 ~ 573.5 4,56u - . ~~EYC3ND - _ BEYOND _ : \ ~ _ _ _ ~ 560 _ _ - _..560 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 ~ / \ 1 ~ ~ ~ 595 _ _ _ _ , . _ _ _ _ _ _ 595 P~' ~ ~ / ` I \ ~ % ~ ` _ ~ 596 _ ; . _ : _ ~ _ _ _ - 590 _ _ . _ _ . _ . 1 Q .VEGETATED _ ~ i S!MELF 10:1 , . _ - ( ) _ 3.1 SIDES - - _ _ _i t~~~ 585' : _ , _ . _ . - - - . _ _ - _ _ . _ _ . 585 ' _ _ _ _ _ _ _ .W _ _ _ _ Z _ , ti\- ~ ~ _ _ _ _ _ _ . _ 580 _ _ _ _ 580 ~ ! _ _ _ _ - . -non nr i' n,~ i? i i~ ~ - OVERFLEW EL 575.0 , - _ _ , ~ v _ L. _ 575 _ , _ _ _ 575 - i , - Y i_ it i _ - _ _ 570 _ _ _ _ _ . _ _ 570 r--_ _ _ A TEN NCE _ _ - III A _ _ _ _ ~5~,~ _ _ , _ k, _ . WQ INVERT' EL 573.0 - ACCESS 565.., _ . _ . . _ , _ , _ : ; _ , _ _ _ _ _ . _ _ _ _;.565 f~ ~j 5.2" DIAM ORIFBCE ~ 2` 560 _ 560 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 URI VO ~ERUIVUJ AREA 595 - 595 2.33: j SECTION C- 590: 590 X; NG SEW,R ,A. 1(V a. 10 VEGETATED BERM DRAINAGE / SS EASEMENT Q POND EASEMENT -3.1 SIDES - SHELF (13.1) ,3:1• SIDES & MAINTENANCE ACCESS 585 585 INV. EL 570.0 " 5 vniVll a cNu~i n 580 580E' i r 1RA l.ln/•r- rl/li1 AF') ~RAIiJA 575 575 ~IV, hC CSVI~JL) r-\ NORMAL BOND EL 573:0- nvi r~ I F-) S i , Rr- n / r` z ND 1 . n p P f I's iLE -'R U TORE o 570- 570 uU ~l_E TL a OUTLET-- „p 565 , _ _ 565 STRUCTURE B.EYOND 560 560 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 PON,v 2 OUTLET STRUCTURE 1j69P9ddi1S® d 10 0 n0 p Rn~. N 0 ALE SCHEMATIC - NOT T , a x,p m -ow s u,-7 PONDv, (1:10) IURAIf~i~Rev. # Date BY Description IjR ,IN1 E EASE- EME .'T scale: 1 06/06/08 EDI WQ PERMITTING PERMITTING UNION "0 I Cp ;"OUNTY PUBLIC SCHOOLS WATER QUALITY POND 2 1 -20 (30x4/-) L-o/ N.,100 z Date- _ FACILITIES, -ITIES, PLANNING & CONSTRUCTION STORMWATER TREATMENT PLANS FOR 06-02-2008 • a A T m 8 qq - _ : Y r- - fi.,... Y d4 6 ht Y4 ? .1. 5' '~k.t - iLL. Not For Sheet: 116 NORTH MAIN STREET MARVIN RIDGE SCHOOLS AM, ~ , Construction PO Box 79133s Charlotte NC 28271 704.841.1779 MONROi )NROE, NORTH CAROLINA 28112 UNION COUNTY, NORTH CAROLINA SDO05 C Dz � �o o -z m o�,c�0 zoo' Z o� �=z �D� C z� Oyu � N o0 z � i I I 0 zy zM o� z<D 0 - --�' oZm c X z DC7 C -< C7 M m1 Z p M �i _ z � U) m� Z 0 --� m' � X r 0O - O z1 z r cn Z IQ OI IN I 0) U)I CD (D I i U) v . I I I -_ I i 1 --- -' N t OI'O /� V/ � I /�� V/ (D < * 0 • I �. 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DA 3 TOPC COPJTOuR LINE - `°rh~ C? ~ o ~ ~ 9 Permanent WQ Pool Volume ~ In T r _.e _o ~ XISTIN~ S~R~AP~1 ' ` - ~ ~ ~ / ~ ~ i ~ i Use 572.0 Perm Pond Elev, deduct 1ft for sediment storage ~ / ~ ! f j i ~ o ,o `~o 4o Table 10-1: SAlDA = Ratia for 85°fo TSS Removal ~ j ~ ' i ~ ' EXISTING WETLANDS I ~ I , . For 38.6% 1m rv & A D _ 3.20 i ; ~ . pe vg ~ - i ~ Ratio - .0.0151 ~ ~ ~ f, ~ , i Required Surtace Area: SA - DA x Ratio ~ ~ ~ ~ rr T I I I A , ~XIS~ING B~ILD~~JG ~ ~ ~ ~ - 1641483.9 SF x 0.0151 = 24 765.3 SF Red Deli r~ SF Etav =572 / i' ~ / i i ~ f l i ~ / / / ~ / ~r I ' / , ~ Required WQ Volume / PERVIOUS AREA i \ ` ~ - = Red Desi n ~<~3..~` CF ~ SA x Avg Depth - WQ Vof. 79,164.8 GF q g '~y ~ ; i i / ~ ' / / / " ~ ! ~ 1 ~ \ l l 1 r \ ~ I~ ~ ~ r/ ~ i/; ~ I I ~ l / ~ ~ _ j ; ~ I , ~ ; ~ / r +l \ , ~ ~ ~ ~ ! ~ I ' EXISTING SEWER ~ / ~ - ~ ~ ~ ~ ~ ~ ~ ~ / ~ ~ ~ \ Tem ors Stara a Volume + ~ ~ ~ i & EASEMENT / ~ ~ ~ ~ ~ ~ ~ , 1 E ~ I ~ ~ i Sim le Method 3.3.1 Control 7" RarnfaN Rd = 1" I ) ~ p ~ r./ k / V ~ ~ ~ ~ l / i ' ~ / ~ i ~ i' /V ~ ( ~ ~ ~ I I~ r ~ i ; I ; ( % % , Required Volume, V = 3630 x Rd x (Rv=0.05 + 0.9x1 a~ x A \ , \ ~ J f j / / / ~ ~ ~ 1 % / o• - ° ~ l \ , Impennous /o. la - 38.6 /o STORM DRAIN / / ~ , ~ y ~ _ I I . i _ Runoff Factor. Rv - 0.3976 / _ ~ I I ~ \ ~ ors a Volume: t ~ Required Temporary St g RETAINING WALL ~ ~ i / ~ ~ i ~ ~ i \ \ ~ _ i , A ~ V = 54 381.6 CF Regd Design: X2,32 CF Elev 574 I , / ~ / % ~ i ~ ~ I DRAINAGE BOUNDARY ~ i ;i i ~ ~ i , j , , V I , ~ / % ~ i ~ , , ~ ~ ,i i ~ Forebay Volume i - ~ ~ POND WATER SURFACE i ; ' ~ ~ i A ox 20% of WQ Vol I ~ ~ ppr A ~ i ~ ~ ~ ~ ~ ~ ~ ~ ~ = 15833.0 CF Red Desi n: 15.24 CF 18.81 ~ ,i ~ ~ Approx Forebay Volume. q g ~ ~ / ~ ~ ~ ~ I ~ i i ~ T T o 0 0 ~ / ~ / ~ i / ~ i ; ~ ~ ~ ~ 'I OU LE STRUCTURE _ o o / / ; , ~ ~ ~ - o ~ i t ~ ~ ~ ~ ~ ~ I ~ / ~ i ~ i ~ ~ / ~ ~ ~ / , ~l i i ~ / ~ ~ ~ W RIP RAP APRON ~ ~ ~ ~ i ~ / ~ i ~ /i ~ ' ~ / i i l , r~ - 1 ~ i / / i i / i ' ~ I I ~ j 1~ ~ i ~ ~ i / ~ ~ ~ / ~ i ~ ~ 1 ; ~ ~ ~ ~ :a. ~ ~ ~ 1 ~ I ~ ' ~ ; ; WEIR~HARD, SPILLWAY .<,.,q"~ ~ ~ ~ / i ~ ~ ~ ~ ~ , , ~ ~ I i ~ i~ ~ ' i i ~ ~ ~ ~ i i ~ I / o i Pt3ND 3 - 85 o TSS REMdVAL I. \ PROPOSED NEW r I DRAINAGE EASEMENT ~ / / ~ , „ / i,, ~ 1 ~ ~ ~ ~ i" ~ Surf Area Incremen#al Cumulative Avg Depth Temp Storage I ,i / ~ ~ ~ ~ ~ i / ` ~ ~ ~ Sc~Ft CuFt CuFt Ft CuFt i / i' ~ ~ r- ~ - ~ i I I' ~ ~ 1. I ~ t~ ~z i i 0 566.0 6,414 < bottom of pond ~ 1 ~ / / ~ i, ~ I I ~ ~ - 7.0 9 759 8 087 < remove 9 ft for sediment ~ ~ ~ ~ 56 , ~ , / % ~ ~ A 'i ~ i ~ I ~ I ; i i 1, ~ I ~ ~ ~ I ~ i ~ . ,A , ~ ~ _ ~ ~ t ~ , ~ ~ / ~ ~ ~ ~ 5 .0 12131 10 945 10945 ~ ~ I i 68 , i i i ~ ~ ' ~ ~ ~ ~ ~ A ~ ~ ~~1 1 ~ ~ , ~ ~ \ 569.0 14,648 13,39(? 24,335 \ ~ i ~ A ~ ~ ~J ~ 1 ~ ~ / ~ / ~1 ~ i /i / / AA ~ ~ 7 310, 15 979 40 314 ~ \ 570.0 1, , ~ ~ ~ ~ / / ~ / / . ~ ~ i / O ~ \ V ~ ~ / ~ / / / V a / ; A ~ i ~ ~ / ~ ~ / ~ ' ~ , ~ ~ ~ % 571.0 20,226 18,768 59,082 ~ ~ ~ ~ o V A % i i / / i / / / ~ / oo i ~ \ \~V ~ / i / ~ 1 ~ ~ / ~ A' ~ ~ o o ~ / ~ ~ ~ ~ / / ~ / ~ ~ ~ ~ ~ 579.5 21,748 10,493 69,575 3.20 ~ V A ~ ~ ~ / ~ / / / ~ ~ ~ ~ ` ~ \ ~ 81376 < Permanent Pond Elev ~ ~ , A A \ , 572.4 25,457 11,801 3.10 \ ~ 572.5 29,520 13,744 95,120 13,744 ~ - ~ ~ ~ / 1 ~ ~ ~ ~ ~ A ~ ~ ~ 1 ~ , I - ~ l ` 345 28 969 573.0 31,378 15,225 110, , ~ \ ~ ~ ` ~ ~ \ ~ \ \ 574.0 35 249 33 314 143 658 62 282 < Tem ra Sfora e i ~ ~ / ~ A ~ ~ ~ 1 i , ~ ~ A, ~ ~ 575.0 39,017 37,133 180,791 99,415 < T ft Freeboard l i ~ ~ A \ A \ / i ~ ~ J I ~ \ ` ~ ~ A A ~ \ \ \ ~ ~ ~ \ ~ ~ ~ ~ i i / 1 ' ~ ~ / / ~ ~ ~ V ~ ~ ~ ~ / ~ / A ~ ~ ~ i r ~ ~V~ V ~ n \ \ ~ ~ ` ` \ ~ ~ ~ POND 3 FOREBAYS i / ~ / ~ ~ / % ~ A ~ ~ ~ ~ ~ % / ~ \ ~ ~ # I Cumulative Av De th Surf Area Incremen a g p - i ~ ~ ~ ~ ~ ~ ~ / ; ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ i ~ ~ V / i ~ v / ~ ~ \ ~ ~ , ~ ~ ~ St~Ft CuFt CuFt Ft \ \ ~ ~ - - - ~ ~ i - - - 1, i ~ ~ ~ ~ ~ ~ ~ A ~ ~ ~ ~ ~ ~ ~ < 4 and \ ~ bottom f 567.0 1,568 p ~ \ i - ~ ~ \ \ ~ ~ i .I ~ ; ~ > > ~ ~ ~ \ \ - 568.0 2 083 1 826 1826 \ , ~ ~ i r ~ \ ~ i ~ I - - - ~ ~ ~ ~ ~ r i ~ ~ \ , ~ ~ ~ ~ 6 2 374 4199 T ~ ~ 569.0 2,6 4 ~ ~ ~ 'i r ~ t / i/ % ~ ~ ~ _ ,r I ~ i~ ~ ; ~ ,~i i i ~ V 570.0 3,310 2,987 7,186 _ ~ ~ ~ I , L ` ~ ~ ~ 1 / , . ~ ~y , ~ 57 . 4 022 3666 10 852 y \ , 10 , \ ~ ~ ~ ~ V ~ ~ l ~ ~ ~ ~ 'V ~ ~ ~ A~,% j , ~ _ \ i / ~ , i \ 571.5 4,412 2,108 12,960 \ % ~ / / , T ~ ~ \ 1. ~ ~ ~ A , ~ ~ . / i ~ ~ ~ ~ „ ~ , ~ ~ 572.0 4,801 2,303 15,264 98.8• Permanent Pond Elev ~ ~ % ~ ~ ~ / o \ y ~ ~ / ~ ~V \ ~ i A T i ~ % \i ono ~o~ ~ 572.5 5 366 2 542 17 805 GAT ~ , ~ o a o o ~ Ed ~ , i / / i 0000000 ~ F ~ \ ~ 0000 ~ ~ \ , 573.0 5 931 2,824 20,630 i / ~ i ~ ~ ~ R ~ ~ ~ 574.0 7,173 6,552 27,182 \ . f~ ' ~ ~ ~ / / / P ~ ~ ~ ,~~r: ' ~ ~ ~ 3 ~ ~ ~ ,~s~~~, ~ ~ ~ F \ ~ ~ ~ 1 i ~.e . ~ ~ ~ ,1 1 L ~ ~ ~ r C .,t ~ P ~ F l ~ , Q D T ~ ,M:,, F ~ ~ ~ ~i , , ~ ~ ~ ~ ~ F ~ T \ ~ y ~ ~ ~ '9/ S ~ ~ T S R /i ~ lp i \ , ~l ~ f ~ ~ i 1~ i ~ ~ / , Q ~ ~ ~ ~_i ~1i I' ~ r t I 1 ~ ~ \ ~ ~ A i t ' l ; ~ ~ ~ ~ ~ ti ~ i ~ ~ ~ ~ ti ti 595 , 595 , i 590 590 i ~ i i 585 , 585 i ~ ~ I i ~ 4.5 4.5 \ ~ I i ~ ~ i i 580 580 i I i I ~ EL 574.0 r'~ TRASH RACK OMITTED FOR 575 ~ ~ ' ' ' ' 575 i i CLARITY I i i ~ ~ 570 ~ ; 570 ~ WQ INVERT EL 572.0 I i ~ ~ „ 5.75 565 565 i i 5.7 DIAM ORIFICE _ r", i~ c 560 t 1560 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 3.5 595 595 ti 590 590 1.15 V v l I A -1 N -17 -1 585 585 t I E L 569.75 j j 580 580 , 7 t 8,5 F 575 575 i ; ; y~ ~r7~ f ~ 1 r r I I~ ~ ~i • 'III f f r~ I r i ~l f7l 1-1 i ' 1 ~ 570 570 _ 1 r 1 1 ~ j ~ \ 7' 00 565 565 IV G -EEE ~ i i r i i 'i °4aeeee° ? ~i s6o s6o 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 .170 POND 3 OUTLET STRUCTURE SCHEMATIC ~ ~ ~ I ! 1 1 i r~ r r f - NOT T ALE POND 2 SECTIONS (1:10) - - Rev. # Date By Description Scale: 1 06/06/08 EDI WQ PERMITTING r PERMITTING UNION COUA 2 06/25/08 EDI WQ PERMITTING REVISIONS 'OUNTY PUBLIC SCHOOLS WATER QUALITY PON - D 3 (30x42)_ - Date: FACILITIES, PL ESi PLANNING & CONSTRUCTION STORMWATER TREATMENT PLANS FOR 06-02-2008 } 0 or fiver n i nx i 116 NC 116 NORTH MAIN STREET MARVIN RIDGE SCHOOLS Sheet: Construction PO Box 79133, Charlotte NC 28271 - 704.841.1779 ?OE, NORTH CAROLINA 28112 UNION COUNTY, NORTH CAROLINA E07 . _ ' EGEfJD & SYI~9BCLS - ~ ' , , - PROPOER T `i LIivE a - , . ~ ~ r nn iT i n i it ~ ~ . - ~OPO wN iCUR ~IN~ ~ ~ ~ 'ii v _ . - ~ ~ ~ ~ . , ~ V IA I~ C`Tfl A A - - - ' - - - - - `nI~T~~J~ ~ir~EHlv~ _ _ t i - - - _ - ~ ~ - ' _y , r ~ Y ~ t~XiSTING WETLAND . - ~ i ~ i ~ . ~ i , , _ _ ~ ~ ~ i i i ~ _ i _ , - - ~ TI ~ U DIN ' ,(IS i v a 'iL 'v , i - - i i - _ o°o ~ ~ ~ i i / ~ ~ o , , . JJ / is ~ Ei o y ~ ~ ~ ~ ~ i i ~ _ ~ - s - j, , -L" - - - , r, ~ ~ ~ - ` ~ ERVIOUS AREA _ _ M 1 - - _ , - ' ~ t- - - / i 1 y~ l . o u r rass _ _ _ ~ - - - ~ , - _ - - - ~ ~ ~ f v ~o . ~ ~ ~ 4 r , ~ 0 - o . ~ - ~ ~ , J X" ~ i ~ - SS - & EAS M NT EE i i J ' l , ~ ~ 1 i J ~ - ~ ~ ~ i ~ ~ _ u rass , _ - t, , . , j r ~ i' i ,i ~i ~ , i' ~ i 1 Jam. 'i i~ ~ / ~ / i` ~ 1 ~ , - „ - - - - - - - ~ - - - ~ - , ~ - - , ~ , , ~ ; , ; - - - STORM DRAW _ _ _ ~ i _i i ~ ~ 'i ' 1 ~ _ i - ~ " _ - - - i ~ ~ ~ ~ , • . V - % i 1 1 ~ - r ~ ~ ~ ~ ~ ~ ~ i~ , _ DETAINING WALL - ~ . ~ s - , ; ~ r ~ . - - - - i ~ , 1, , ~ % ~ I i - ~ r_ ; I ora e - " ~ ; _ ~ - = ` DRAINAGE BOUNDARI' - - ~ - - r - ~ ~ ~ ~ _ - , , ~ ~ - : - , , , ~ - . , _ _ , ~ _ _ _ ,t ~ ; , i' r- - - ~ _ - - - .r- ~ - , - n ~ r ri r i i n r o , " oN~ U~aTt~ ~ REH - - - _ ~ ~ ~ I ' i - - - _ _ _ , . _ _ - ~ t. ~ r i „ ~ ~ - _ - - i ~ ~ ~ ~ ~ ~ l~ - _ = ; v, _ _ _ ~ - - - ~ _ I ~ - - 1 i f_ _ _ ~ ~ .y T y ~ y~~ ~ - ` 1 1 - ~ OUTLET STRUCTURE - ~ - ~ - - i - - - _ , - _ _ ~ - _ _ _ ry ~ ~ _ - _ N/, - ~ ~ i i ~ ~ - _ - ~ ~ RP . ~~-i~"- ~ `W RAP APRON ~ _ ~ _ - o - _ _ _ .,.s-~.,y, - ~ - - ~ _ - _ _ ~ - ~ . _ ~ z - ~ P ~ ~ _ ~ ~ ~ i V ~ ~ 1 ~ ` 1 _ , ~ , - 1 ` t ~ WEIR H , - .t~-; , ARD. SPILLWAY k~ti..a~.~. - ~ 1 1 , - _ ~ ~~1 ~ ~ ~ ~ _ - . . I, ~ \ ;.M its - . ~ . ~ ~ / , r; ~ j_~ /II w q.,.. - r; ? P P ~ ~ ~ _ ~ 0 OSED ~ ~ , R N ~ ` , IVe a In _ ~ , ~ ~ x DRAINAGE EASEMENT 000 ~ _ _ - ¦ ¦ 0 00 ~ ~ \ \ ~ , 8 ~ / a _ - - V - - - ° ° ~ _ v ~ V ~ ~ ~ ~ ~ . , _ e a in - ~ o ~ ~ a _ - r ~ ~ r' o o ~ ~ r • , _ ~ ~ ~ ~ . . ' ~ ~ ~ ~ ~ ~ ~ ~ ooo oygo c ~ - _ _ - _ - ~ ~ i ~ ; ' - ~ . ~ i _a~.._ ~ ~ , ~ \ ~ I ` ~~o~p X90 ' „ ~ ~ ~ i ora e - , l~-, ~ \ _ °a ~i V ~ V o ~ i , , ~ ~ ~ ' ~ ~ \ _ ~ 1 ~ ~ \ ~ ~ ~ ~ ~ 1 ~ ~ ~ ~ / _ , _ _ _ ~ ~ ~ ~ ~ , 1 1 \ ~ _ . ' i . ~ ~ - i ~ i ~ ~ ~ , I ~ _ ~ ~ ~ ~~i ~ _ ~ ~ ~ 1 " ~ ~ i _ \ \ ~ i ~ "~.r_____ ~ \ ~ ~ / ~ / ~ _ ~ y ~ ~ ~ i r i ~ ~ _ ~ v ~ ~ ~ ` ~ - - - i ~ ~ ~ ~ I r ~ ` ~ ~ i ~ ~ ~ / / ~ ~ \ \ . 1 I ~ ~ _ i \\i ~ I r Vii A i \ \ i \ ~i / ~ _ ~,Si~ ~i V A V~/i ~ ii ~ 4 \ ~ \ ~ \ ~ V ~ . l \ _ ~ i l \ ~ ~ , i - ~ i~j _ _ \ y/ \ s_~a_~ _ - _ _ \ ` / ~ ~ _ D 15 30 fip ~ ~ ~ ~ ~ i r ' , _ p r. h ' i it !illy I iei ~~~l rll .II 'I ~ \ ~r~~ ~ I i _ ~ ~ ~ ~ %,f - - ~ - I i ~ ~ PLANTIN i , i ~ ~ I q ' 0o q - ~ o°ooo 0,°0 l S ecies Pond 2 Pond 2a Pond 3 Total p s J °a ~ _ ~ ~ i ~0 ~ ~I p I ~I ~ ~i ' _ ~ p i Q i ~ _ ~ ~ r _ - Zone 1-Littoral Shelf ft 6 423 3 960 6 863 17 246 sq p ~ - i' Q- Juncus effusus - Soff Rush 620 380 660 1, 660 _ , = i i Sci us c erinus -Wool rass 620 380 660 1660 ~ Yp g , , Carex s . - Sed e 620 380 6 1 p g 60 , 660 'r Totals 1860 1140 1980 4 980 ',i 1 i~ ~ i ~ j ~ i~ ~ ~I I i~ f , I , i ~II ~I Sow RUSH Zone 2 -Live Stakin ft 858 485 1727 g sq 3, 070 (JUNCOS EFFUSUS), f i i I 24~~o.c. A~oNC Salix Sericea -Silk Willow 45 20 75 140 Y - ~ ' i ail i I i I TOE OF SLOPE " ~I - ~ - ~ ~ s , Comu m m m - 'I 11. o s a o u Sr k Do u~nod 45 20 75 140 Y 9 - _ i ~ - , °rt I ' Y r' i I Sambucus canadensis - Elderber 45 20 7 - ry 5 .140 i , j ~ 2:1 i i i ~ . . i I 2.0 ~ ~ ~ i - v _ I _ ~ ~ ~ i _ j i i ; i ~ ~ Tots Is 135 60 225 420 ~ i , l~ ~ , I i ~ ~ REINFORCING ~i~ ~ ~ I - ~ - - - i MATTING ~ ~ ' I j ~ %i 1~ ~ - I ~ ~1~, ~,~4.0 3.0 4.0 ~ i , i I ' _ ~ ~I ~ , i ~ ,-i _ ~ I ~ r ~1 , i l I 1 - I _ , , , 1 ,,1 CHANNEL ~ _ ' ~ I 11 ~ ~ i t ~i \ u^ OUTLET GUARD OMITTED FOR ~ - J_ _ , i CLARITY 3.5 4.5 4.5 _ ass . ur r ~ ' ~o i ~ ~ 'y Ao ;q ~ - ~o a i ~ , i ~ , ~ -r~~'' ' ~ 'ii ~ _ i I i ~ _ ~ ~ , , - h-- , ~ ~ ~ ~ ' _ ~ . , ,~-r~- i ~ ~ ~ I ~ _ _ ~ ' FLOW SPUTTER WEIR EL 571.0 , 5.75 - Live Staking. • I 3' x 3" LAYER I ~II o r OF #57 STONE 4 pas ~ I o°oooa 4 LEVEL SPREADER LIP HIGH FLOW BYPASS I t 3: 1 ~ ~30' FILTER STRIP VEGETATED INVERT EL 569.0 li - - - _ i ora Shelf W WITH TURF GRASS tt .t .v ER ERE CAPO' . `I v~` ,t 9 0.75 I ~ ~ I ~--ti 4 5 ~3' STRIP OF TQ~ v` ,v vv~ tt _ t FILTER FABRIC X\P~N Fj~TF~F~ w - - 022 CHANNEL ~Oe) P-b9C' 11" DIAM ORIFICE SRS RA F FR ye INV. El 569.0 T /A '90 49~' moo ~ `~e HE oR L Turf Grass 0 15 30 60 WQ POND 3 DA-3 LEVEL SPREADER /FILTER STRIP DA-3 SPUTTER BOX i ~I Rev. # 'Date By Description Scale: 1 ~ 06/06/08 EDI WQ PERMITTING PERMITTING 1 I 40 UNION CO ` 2 106/25/08 EDI WQ PERMITTING REVISIONS COUNTY PUBLIC SCHOOLS VEGETATION PLANS S es OVS F1 I I %Woo - (-Ox42) - - - Date. - FACILITIES, ITIES, PLANNING & CONSTRUCTION STORMWATER TREATMENT PLANS FOR 06-02-2008 Not For f ie,,~;rqn Cor~s~iltioq116 Sheet: 116 NORTH MAIN STREET MARVIN RIDGE SCHOOLS ~ - - - - COIIStCUCf1011 PO Box 79133, Charlotte NC 28271 - 704.841.1779 ~ ~ MONROE )NROE, NORTH CAROLINA 28112 UNION COUNTY, NORTH CAROLINA 0 ~ ' ~ I i _ .Y . _ i ~ = _ i r ~ t , ~ I ~ i 1 ' 1 _ _ ~ _ _ - _ i ~ ~ _ _ _ ~I I _ i ~ --~1 ~ ~ i ~ ~ ~ - I_~ J i - - ~ ' ~ I <.1 _ ~ _ I - _ ~ - - - _ . i , i _ d__ - I _ - ' ti ~ ' _ i - _ - ~ ~ I i ~ _ r _ i, i , ~ ~ _ ~ ~ : ,.i I i i ~ I { _ ~ , ~ _~_--.~_r _ _ _ ~ ~ _ ~ _ ~ ~ - - o - _ - ` y.- - r _ - - - - L ~ ~ - y.. . _i - ~ _ - ~ b 9 ~ , . w - _ / ,1- ? ? ~ - r-_ ~ ~ , i ~l - ~ ~ - - - _ _ _ ~ ~ ~ ; - i i - - - - c~ ~ ~ -I- m i ' 1 ~ ~ i I i r I i ~~1~ , P ~ 10~ ~ ~ 0 I ~ ~ ~ ~ r - ~ i P ~ ~ li ~II~ i ~ n , _ 1 '~.s r. ~ ~ I I ,1 ~ I i., ~ ~ ~ ~ ~ ~i III i 9 ~ I ~I , - r - , - sia ~ ' ~ ~ i ~ i~ ~ ~ ~ I / ~ ~ ~ f 1 I I~ ~ L ~ , ~ ~ - _ ~ i ~ I ~ ~ ~ ~ ` ~ ~ i i > , .II I ~Iri i ~ I• ~ 1 I i i I , 'I ~i I i ~i ~ i I ~ i ~ ~ ~I ~ i i ~ ~ ~ , ~r i ~ I i ~ I .I i i ~ - i r I 'i ~ i 'i II,, ~ ~ i ~ ~ I ~ I I I I) , ~ f i V ~ i r ~ i ~1 i i i i I ;n, i I 1'. ~lil, I - a - ~ ~ ~ ~ t _.J ~ ~ .l. ~~il' I i ~i ~y i r~ ' ~ ~ ~ ~ ~ i Q - ~ I _ '8 i+ ~ ~ ~i ' ~ I ~ ~ _ ~ ~ ~ ~ 1, s ' i ~ ~ I I i , i i Z i s~ - S ~ I ,n-- 1 ~ ~ = i ,,i, G ~ i ~ - ~ 1 _ ~ - t - i _ l I /i 1 ,i ~ , - ~J ~ I ~ ~ - _ ~ I I i, ~ 9991 6~'~ i ~ , - ~~~,I ~ 1`~ - i ~ ~ ~ 7 ~ ` I~' F T - ill .I ~ 1 ~ 4. _ „ i ~ i,,~ ' ~ ~ ~ ~ II' 1 ~ ~ 5~~ - e , 1 i _ _ ~ , ~ ~ ~ ~ ~ I i , ~ ~ l F - _ - _ I - - I ~i i , - i~ I i i I r i - ~ ~ r HIGH ~m L~_ '~i, i - ~ l Ii / - _ ~ ~ - r ~ ~ ~ ~ ~ r I H i SC OOL - ~ ~ , 't ~ ~ r ~ 1 - ~ sr ~ -r - ~ ~ ~ i , W _ ~ _ _ I 1 ~t ~ I T i _ - _ ~V _ ~t I 1 ~ i I i rn ~ ~ ' ~ - _ t \ _ _ I ~ ~ I ~ i ~ - I ~ _ - I i - - - - i ` \ - - \ ~ I ~ ~~i I~ ' ~ / - i , ~ I' ~ ~ CONSTRUCTION ENTRANCE TO ~ - _ ~ I - r i -EXISTING SAN. SEWER EASEMENT ~ ~ , ~ I i ~ ;i - ~ ` i ~ ~ - ~I i , ~ ~ ~ , i'' _ j ~ - ~ ;f ~ ~ ~ i i . ~ III ~ / ~ ~"1 S~„~~ 1 I , _ _ i i ~I _ ~ , i; `i I 'i i I I i'' G~ I ~ i ~ ~ i I ' ~ I ~ _ ~ INLET ~ ~ I ~ ~ A - ~T' I ~ A \ ~ _ ~7 I I ~ ~ I ~ PROTECTION ~ i - _ + ~ ~ i" I ~ I ~ i , C ~ ~ I CONSTRUCTION ENTRAN E - _ I it ~ ~ ~ ,l} l ~ ` \ ~ ~ ~~'o - ~ I ' ~ ~ 11 i I ~ ~ ' - ~ ~ ~ " ~ ~ ~ ~ ~ TO ATHLETIC FIELD ~ I i s ' 1 I I _ ~ ~ - - ~ POND 2 , ~ ~ ~ ~ I ~ ll - ~ ~ ~ ~ ~ , . ~ • ~ , s- k i ~ ~ . , ~ i ~ ~ ` ~ - ~ li'~ ~ I ~ , ~ _ J, J ~ ~ ~ ; _ _ - - - ~ Vii' ~ ~ I - ~ `~CVA ~ - 1 I ~ r - i~ _ ~ ; , POND ~ ~ li r. , _ ~ f PUMP INTAKE ~ ~ _ ~ ~ ~ , , il' ~ ~ ~ - _ _ i - a~ ~ _ = ~ ~ i ~ / = ' ~ ~ WATER PUMP A~, ~ .CHECK DAM ~ ~ ~ 1 ~ ~ ii~ ~ - ~ ~ I I _ ~ i - - c~> a ~ ~ SILT BAG i j~~ A o I i ~ / ~ ~ ~ 0 ` - y ~ - _ ~ ~ ~ i / , ' ` ~ DIVERSION DITCH , I - - ~ BEFORE EXCAVATION ' ~ ~ ! , ~ ~ ~ ~ ; ~ 1 ~soe ~ ti ' ~ ~ ~ ~ ~ _ ~ ~ ~ ~ ~ ~ ~ ~ ~ d I~ ~ I o Ii ~ ~ I i ~ ~ I, ~ i ~~iL I ' BE IN ' ~ ~ G S PUMP CLEAN , ~ ~ ~ ~ , _ ~ ( ~ ; ~ i w ~ Q i ~ , i I~ ~ ~ ~ 1 1, I 1 _ ' - _ AI ~ ~V ~ ~ ~ ~ WATER ~ ~ . ' DISCHARGE SILT FENCE ~ . , J I ~ ~I ~G 1 i - _ ~ ~ _ Q'~ _ 1 ~ II! ~ ~ , INTO STONE BED _ ~ i ~ x~ ~ _ ~ ~ `1 I ~ ' X - ; ~ ~ ~ ',2~5 ~ - - / A. ~ X i' l ` ~ 1 I AFTER EXCAVATION ~ ,.max,, ~ ~ , 1 ~ I i O ~ TR P ~I T _ _ ~ BE IN P , ~ A ~I O G S UMP ~ - i a ~~~4~ ~ ~ _ I jg I, _ 1 _ _ ~ ~ i I 1 ~t ~~i - DISCHARGE INTO ~`~t ~ ~ , ~ ' ~ ~ I ~ j ' ~ ~ i I ~ I ~ I ! I ~ - - - ,SILT BAG ~ = ~ • R F T ~ i~ R f~STR T Xl N _ 0 U 8e i r _ ~ ~ ~ ~ ~ i I ~ ~ ~ ~ ~ i I, ~ i ~ I i i , <<, ~ , ~ J R N I~ TR ~ ; _ _ _ ~ - , ~I SO CO TA N H _ E ~S 0 S T J ' ~ ~ MIDDLE - ~ ~ r BALL FIELD WILL BE USED y ~ ~ ~ _ scHo OL ' ~ ~ MIDDLE _ ~ i i ~ ~ SCHOOL I ~ ~ _ ~02. AS STA I N AR r G G EA FOR ~ ~ ~ ~ ~ - _ ~ ~ , , i ~ - ~ ~ i _ ~ t.. ~ PONDS 2 & 2A. ~ ~ ~ ? ~ _ i - ~ ~ D E f~ ~ _ E C S P A TW _ _ _ , ~ ~ s~,p ~ ' ~ ~ " ' ~ ~ 'il~~~~l, - - . i r ~ ~~)il ~dj~ I ~ r AREA THAT ~A XTA , , ~ ~ ~ S X RT HI TU N _ ; -POND 2A _ - ~ ~ ~ _ al ~ ' ~ - _ ~ _ ~ PROPOSED NEW ~ ~ ~ ~ 1 TR A _ TR R A _ , CAN A _ RA N i~ AWAY _ G ' ~ 6. i' 1 , i _ ~ ~yr ~ 1 1 I~ I A , I ~ ~ ~ ~ r 1 POND LIMITS ~R M TH XI TR CT Ofd M T , ~ - mot' r~ ~ / i ~ _ ~ ~ ~ ~ ~ ~ ~ A' - ~ ~ i A r ~ ~ ~ z,. ' HIGH HAZARD ~ ~ ~ 1 ~ V1 A ~ I i ~ i ~ ~ _ ~ I y. - _ i ~ 1 > ~ I ! - - DOUBLE SILT FENCE ~ ~ ~I , • THE ~ M T ~ TR ~ ~ 1; 1 _ 0 NS T H P R T 0 ~E R ~ I ~ i~ ~ ~ ~ I ~ r . - , , . I ~ << di!~ / i I 1 ' ' ~ l HA PR ~ ~ ES ~ ~ E T T AT A , D T~ ~ , ~o _ i i ~ I i ' ~ , ~ ~ ~ . A A r . , ~ ~ i ~ ~ ~ _ f „o ~ ~ _ ~ I i 1, ~ ~i 9 . _ i F \ 2 i i I I , . l I i _ _ i~ ~ A _ i C ~ C' ~ - i I ~ k. I ~ - - - III • ~ _ ~ S - - - - ~ , ~ , _ ~ _ Ili A ON PHA T , C ~ FN SL C HA I , ~ _ i ~ 9~ A' _ RI _ ~ . ~ : ~ e ~ . X~ - - ~ ~ ~ ~ ~ _ E T ~~ED N R M XI TA Y T ~ , S CE ~ 0 ~ ~ ~ ~ ~ - i~ i ~ ~ I ~ ~ j ~ ~,i, _ ~ ~ - ~ ~ i j ice" ~ j ~ i I, , I - - ~ Hl S T P , P R TH ~ ~ ~ ~ ~ SILT FENCE O T T E I~ W Y TR 0 N D l - ~ , % ~ i i ~ ~ ~ , _ ~ WATER PUMP - _ _ ~ I - _ ,v, A TH RK f ~ ~ ~ WATERF WO R R , PUMP INTAKE . ~i ~ i i ~ ~ \ ~ SILT BAG ~ >ILT BAG _ i~, ~ - = ~ ~ _ , i 1 ~ I . _ \ , ~ ~ ~ ~i, _ _ - ~ ~ ~ ~ ~ - o XCA1/A H AR A MA R R S Y E _ ~ ~ ~ ~ - r. ,o~ 0 ~,~r. / I ~ ii' ~ a - `BEFORE EXCAVATION BEGINS _ i f n ~ i W ~ ~ ~ ~ i ~ ` E X U ~ TI ~ - ~ ; ; ~ ~ ~ ~ D AT RI RIHI CO TR H ~ ~ UC 0 PUMP CLEAN WATER DISCHARGE ~ t ~ ~ V ~ i ~ ~ ~ I , _ _ _ WHf~R I A RH P MP - E R WAT C U - - ~ , . _ ~ ~ , +-~„ir ,i ~ ~ ~ i ~ ~ z 1 I ~ ~ I i _ , A ~ ~ + 1 i _ ~ I INTO STONE BED , . _ ' i _ - ~ i ~ 1 i~. - ~ i , '-o S H A I~ ~ E H W JUH T N TH A ~ ~ ~ AFTER EXCAVATION BEGINS ~ o ii i~ r, _1 ~ ~ ~ - ~ , 1 ~ I ~ I ~ . A A - ~ ~ i ~ t 1 ~ ~ ~ ~ ~ . , t ~ ~ ~ ~ ~ I rc \ , SIFT BAG AT TH I H - _ , P SC AR P I ~ MP I D C E T U D HAR E ~ SC G I ~ ~ ~ ~ ~ ~I ~ ~ ~ ~ ~ I NTO S I LT BAG ~ R~ R T T A 1 ~ , ~ ~ IV ~ i _ _ _ ~ _ \ ~ ~ ~ ~ _ ~ 0 C~02 I SEE 1/EC.OZ - ~a ~ , j ,A i i • ALL NECESSARY CARE SHALL BE TAKEN PROPOSED NEW POND LIMITS TO PROTECT THE RECEIVING WATERS . ti HIGH HAZARD FROM SEDIMENT AND BANK EROSION. DOUBLE SILT FENCE SEE 5/EC02 • q • MAINTENANCE OF EROSION CONTROL STAGING AREA MEASURES IS CONSIDERED INCIDENTAL TO THE CONTRACT. - a RZN C ~ - - - - TARK/ LL I COE • GROUND COVER MUST BE ESTABLISHED - - RANCH J 1 s 3 WITHIN 21 CALENDAR DAYS OF sy~ sos • Rj~1 i~~r E ~1~ NQ = EXISTING SAN. SEWER EASEMENT COMPLETION OF ANY PHASE OR SECTION f OF WORK OR 21 CALENDAR DAYS OF - ; o so n zbo INACTIVITY. I i \ Rev. # !Date By Description Scale: 06/06/08 EDI WQ PERMITTING PERMITTING UNION CO 2 _ Y 06/25/08 EDI WQ PERMITTING REVISIONS ~r 1-100 I 0x42) - - (3COUNTY PUBLIC SCHOOLS EROSION CONTROL PLAN - - - - - - Date. gwimi; 1 7', N 7F. -10 FACILITIES ITIES, PLANNING & CONSTRUCTION STORMWATER TREATMENT PLANS FOR 06-02-2008 + - Not For & 116 116 NORTH MAIN STREET MARVIN RIDGE SCHOOLS Sheet: ~ - - Construction PO Box 79133, Charlotte NC 28271 - 704.841.1779 MONRO i NORTH CAROLINA 28112 UNION COUNTY NORTH CAROLINA ECE I 'I f I ~ A. EROSION CONTROL NOTES KEY/ANCHOR MATERIAL AT I ~ A Project Manager will provide construction observation during the construction phase of this project. C. POND CONSTRUCTION TOP DF SLOPE. ~~[`~c~i+~ ~~1171t I I ~ Any questions will be directed to theProject Manager and the Project Manager shall have a 12" MIN. I SPACING TYP.* I minimum of 24 workin hours to re I . 1. After the and has been drained to the satisfaction of the ro ect mana er excavation ma SILT BAG I .GENERAL NOTES: I g pY ) p p J 9 Y ~f begin. f f f f ! f EA15wiFl~ TB1'f'~s„~t2 36" MIN. SPACING TYP.* / f f / 1. LAY BLANKETS LOOSELY AND STAKE The contractor shall employ athird-party full-time Erosion Control Inspector. The Erosion Control 2.) Excavate the pond according to the plans, progressing towards the delineated Staging area. f f OR STAPLE TO MAINTAIN DIRECT t i o tractor's ork u i erosion control measu es Inspector shall have he author ty to suspend the c n w nt I r 3.) Dispose of any unsuitable maternal off-site. Remaining excavation will be placed on site rn _ r f f f / CONTACT WITH THE SOIL. DO NOT f STRETCH. are in lace and functional accordance with the tans. p P ~_r_ ~-M..._.<_,.r-,_,.~.~ _m,_- r The followin se uence shall be used Burin the im lementation of the tans unless otherwise 4. Stabilize the slo es and disturbed areas with mattin and tem ora seedin at the end of each 9 q 9 p p ) p 9 p ry 9 2. * DIMENSIONS SHOWN ARE ! ' ; I ' f MINIMUM, MANUFACTURED I _ approved by the Project Manager. day. ° r f 6 PRODUCTS MAY HAVE ADDITIONAL OVERLAP f / ~''i - REQUIREMENTS THAT MUST BE MET. / IN SLICE / 1. The contractor shall re uest a re-construction conference within seven calendar da s of Notice D. PROJECT COMPLETION q p Y / 3. SLOPE SURFACE SHALL BE FREE I of Award, a.,., 1,~}~ to 2D,~? FLOW / OF ROCKS, SOIL CLODS, STICKS, f • The contactor shall submit all submittals and sam le catalo cuts for review at the 1. The site shall be free of trash and leftover materials rior to demobilization of a ui ment from the p 9 ) p qp GRASS. MAT%BLANKETS SHALL HAVE I !f ' ~ / GOOD SOIL CONTACT. re-construction conference. ' site, p i • The contractor shall submit the construction .schedule at the pre-construction conference. 2.) All areas shall be seeded and mulched before leaving the project site. Ground cover shall be f ~ , 4. THE DETAIL SHOWN IS FOR SLOPE i~ • A list of Su tiers and Subcontractors shall be submitted at the re-construction conference. established for all disturbed areas within 21 calendar da s followin com letion of construction. (I i~ MATTING. FOR CHANNEL OR PIPE 5~1~~~1BtTE Ofa~1tF^4a ~kOTI~ it OUTFACE MATTING SPECIFICATIONS, pp p Y 9 p 2. The contractor shall ensure all ermits are obtained. 3. With the a royal of the Project Mana er and the Erosion Control Ins ector remove the silt ~ PLEASE REFER TO NCESCPDM ) p ) pp 1 g p , Fx~1Bf FB~lT`lt; OVERLAP IN DIRECTION OF FLOW STANDARD #6.17 AND , 3. The contractor shall have utilities located rior to mobilizin on site. ! fences once vegetation is established. p g MANUFACTURER'S GUIDELINES. i 4. The contractor shall erect safet fences at the Limits of Construction. 4.) For Landscaping and Final Ground Cover, refer to the Plantin Plan and Plantin Notes. Y 9 9 5. Mobilize a ui ment. Pre are stabilized construction entrances at locations noted on the tans ins 5,) Permanent seedin mixture shall be a lied at the a ro riate time of ear, as shown in the ) q p p p 9 pp Pp p Y Provic Provide Stabilized Outlet accordance with the NC Erosion and Sediment Control Planning and Design Manual: Planting Notes. to sty to stream Bank. z COIR MATTING 100% BIG-DEGRADABLE 1 SILT BAG DISCHARGE FILTER KEY ANCHOR MATERIAL To roE of SLOPE. ~ "Temporary Gravel Construction Entrance/Exit" (6.06). 6.) Complete the landscaping (bare root planting) at the appropriate time of year, as shown in the / EC. NOT TO SCALE I EC.02 NOT TO SCALE 6. Install silt fences and tree rotection barriers. Plantin Notes. ) p g 7.) Prepare a staging area as shown on the plans & approved by the Project Manager. Staging areas will be located on the practice ball field and within the storm water easements. Care will be, i taken around existin avements and roads. The contractor shall not block in ress or a ress ! TEMPORARY GROUND COVER 9P 9 9 ~ I I I from the school property. I 8. Construction traffic will be limited to within the "Limits of Construction" which are also the "Storm SEEDING SCHEDULE _ Water Easements" noted on the plans. 9. FOR ALL WORK IN EXISTING PONDS FOLLOWTHE POND DRAINING PROCEDURE. Date T e Lbs/acre ) ~ - - Yp GENERAL NOTES: NOTES: I 10. Maintenance of Erosion Control Measures and Pond Drainin 0 erations is considered Feb 15-May 15 cENERa~ 9 p I incidental to the work. Rye Grain (Secale cereale) 120 CHECK D 1. CHECK DAMS MAY BE USED IN SLOPING DITCHES 1. A STABILIZED ENTRANCE PAD OF 2"-3" WASHED RIVER GRAVEL SHALL BE LOCATED WHERE TRAFFIC WILL ENTER OR LEAVE THE CONSTRUCTION OR CHANNELS TO SLOW VELOCITY OR TO CREATE SITE ONTO A PUBLIC STREET. ' Korean Les oR cHa~ pedeza (Kummerowia Stipulacea) 50 sEDiMEN SEDIMENT TRAPS. 2. FILTER FABRIC SHALL BE USED AS A BASE FOR THE CONSTRUCTION ENTRANCE. B. POND DRAINING PROCEEDURE Ma 15-Au 15 Y 9 2. ENSURE I 2. ENSURE THAT MAXIMUM SPACING BETWEEN DAMS PLACES THE r-s' ~aN. 3. THE ENTRANCE SHALL BE MAINTAINED IN A CONDITION WHICH WILL PREVENT TRACKING OR FLOWING OF SEDIMENT ONTO PUBLIC STREETS OR Brown-Top Millet (Panicum ramosa) 40 ToE of TOE OF THE UPSTREAM DAM AT THE SAME ELEVATION AS THE # e wasHED sT°NE EXISTING PAVEMENT. THIS MAY REQUIRE PERIODIC TOP DRESSING WITH ADDITIONAL STONE AS CONDITIONS WARRANT AND REPAIR OR CLEANOUT DOWNSTREAM DAM (SEE DIAGRAM BELOW)• OF ANY MEASURES USED TO TRAP SEDIMENT. , F R EA H PHA E F THE W RK: ~ Au 15-Dec 15 DowNSrF 0 C S 0 0 g 2 Rye Grain (Secale cereale) 120 4. ANY SEDIMENT SPILLED, DROPPED, WASHED, OR TRACKED ONTO PUBLIC STREETS MUST BE REMOVED IMMEDIATELY. I 1.) Locate the pump and hoses for the dewatering pump. CUSS B RIP AAP ~ ~~OW z MAx 5. WHEN APPROPRIATE, WHEELS MUST BE CLEANED TO REMOVE SEDIMENT PRIOR TO ENTERING A PUBLIC STREET. WHEN WASHING IS REQUIRED, IT I AT CENTER SHALL BE DONE IN AN AREA STABILIZED WITH CRUSHED S70NE WHICH DRAINS INTO AN APPROVED SEDIMENT BASIN. 2. Perform the and dewaterin in accordance with the laps. Once the and is dewatered the ~ • Add soil amendments as recommended b soil tests ora 12 000 Ib/acre round p 9 p p Y Pp Y 9 and excavation can be in. Do not disturb an more area outside the existin onds than can be agricultural limestone and 750 Ib/acre 10-10-10 fertilizer. "'~I =m., p g Y gp III,i _ _ _ A MAXIMUM SPACING B So' MIN. IlL111~11_II_ = c = PUBLIC STREET stabilized at the end of each workin da . • Apply 4,000 Ib/acre straw mulch. Anchor with 100%-biodegradable netting. - I-Ip=1H_III=(iI_='IIl~lll_ II] , _ _ ° i0 6 9 Y 3. At the end of each workin da stabilize com leted areas as shown in the tans. Remove the II-Ip=111_111=111_f(I_ EXISTING GROUND' ) 9 Y, p p A AND B ARE AT EQUAL ELEVATIONS solL sr,AeluzATloN FABRIC CROSS SECTION UNDER 2"-3° WASHED STONE pumps and hoses. Inspect erosion control measures and make any repairs. 4. When each hase of work is com lete stabilize the areas disturbed b as shown in the laps. p p Y p 50' MIN. 1~-6" MM. i W I ( W n~~r=u~= i ~ III~II=11= - -III=III=a, (n Ill~l~dpdp= 9° MIN. 11=R!?IV?Ili? Z nl=~, 11~l=_ ~ U IN,Illli ~ 1111- N J I ~j11TI=n III=n m 111=_ -ICI ~iNl_ ~ W=~~~ = 11=111=1j FILTER CLOTH ~ 1113-W- III=p1=- 111g11~11=a~111=11="III=ill=III=m-"=~= 1=III=IIIaI_i=_- _ SEQUENCE OF CONSTRUCTION IIi_ 111E1Pc ITI?ginITI=111=1H=q1=1H~111=111- s C H E C K DAM a TEMPORARY CONSTRUCTION ENTRANCE PLAN EC. NOT TO SCALE EC.02 NOTTOSCALE A. POND 2a 1. Install the interceptor structure in the existing storm drain line above the location of Pond 2a, 2. Install a tem ora diversion culvert from the interce for structure to the embankment at the p ry p northern end of the Limits of Construction and stabilize the outlet with rip-rap. i ' 3. Install diversion ditch, with check dams, around ball field as indicated on the plans. 4. Install inlet protection around existing drop inlet on the North side of pond 2. 5. Install silt fence around ball field as indicated on the plans. 6. Excavate the embankment and construct Pond 2a. Remove unsuitable soils from the site. Spread suitable excavated material on the Middle School Athletic Field and stabilize with STEEL POST B' MAX. STEEL POST temporary ground cover, WIRE FENCING WIRE FENCING z 7. Dewater the pond as necessary during construction by pumping the water into a silt bag. ~ FILTER FABRIC I SILT BAG DISCHARGE FILTER (SEE NOTE 2) o ~ ~ ~5 WASHED GRAVEL Refer to the Erosion Control Notes & Details. 4 WOVEN FILTER FABRIC ~ < ~~OR6 PUMP ~ FLOW 8. Stabilize Pond 2a and the surrounding disturbed slopes as daily work progresses. Stabilize N ` ~y the culvert outlet. 9. Install the permanent storm drain line from the interceptor structure to the forebay of Pond 2a I I I I I ~I I III-III-I I ~l I-III-III-III-III-I I ~I I- 11T 111=11-I I I-III-I I I- m=~=~-1 1=~1=rr~ll~ Irl~-rl~r~ T_Trr~'I~! ~r--~r1=r~ r~ I T=rr X11=1T~I I 1_TI=111=111=1~1--111=1~~~=111=f11=1L-T I iir-~1=1 = I =111= aucHOR sKIRr and stabilize the outlet. I I-Di= I I I-1 I I-1Ti=111=1>-lT~l I f-if T=T~TI1=1i~-~(~-i((=1T~1 =1 I> I f-1` '~G -~,~-m=11 _IThI T=ITI=III. 11_x_-r(=III=~j=11 1T(=1i=lllTllf ~=11 a" MINIMUM y, B. POND 2 ,-m- GENERAL NOTES: `A~• SAND BAG CHECK DAM BEYOND, IF REO'D 1. Drain pond by pumping clean water to the existing outlet structure and muddy water into silt 1 FILLER FABRIC FENCE SHAT .R FABRIC FENCE SHALL BE A MINIMUM OF 32" IN WIDTH AND SHALL HAVE A MINIMUM WATER LEVEL i LINE WIRES WITH 12" STAY SPACING. bag as indicated on plans. DF 6 LINE WIRES WITH EN FILTER FABRIC BE USED WHERE SILT FENCE IS TO REMAIN FOR A PERIOD OF MORE MAINTENANCE NOTES: NOTE: ~ 2. Excavate the northern pond embankment (southern end of the Middle School Athletic Field) to z. H N"3o'LOAASFABR'G BE I V 3D DAYS. 1. FILTER BARRIERS SHALL BE INSPECTED BY THE FINANCIALLY RESPONSIBLE PARTY OR " proposed grades above 570' including the maintenance access road. Leave the existing Pond 3. STEEL P°STS SHALL BE 5' TYPE. A - " I HEIGHT AND BE OF THE SELF-FASTENER ANG T HIS AGENT IMMEDIATELY AFTER EACH RAINFALL AND AT LEAST GAILY DURING 1. PRIOR TO INSTALLATION, MANUFACTURERS SPECIFICATIONS OF FILTER MEDIA SHALL BE - " :L POSTS SH LL BE 5' D N LE S EEL PROLONGED RAINFALL. ANY REPAIRS NEEDED SHALL BE MADE IMMEDIATELY. PROVIDED TO THE EROSION CONTROL INSPECTOR FOR APPROVAL AND USE. DISCHARGE 2 outlet structure in place. Spread suitable excavated material on the Middle School Athletic 4. PARE FENCING SHALL BE A FROM FILTER MEDIA SHALL MEET OR EXCEED THE PROVISIONS OF THE CLEAN WATER ACT. - - FENCING SHALL BE AT LEAST X10 GAGE WITH A MINIMUM OF 6 LINE WIRES WiTH 12'• 2. SHOULD THE FABRIC DECOMPOSE OR BECOME INEFFECTIVE PRIOR TO THE END OF Field. STAY SPACING. Y SPACING. THE EXPECTED USABLE LIFE AND THE BARRIER STILL IS NECESSARY, THE FABRIC 2. ENSURE THAT PUMP PRESSURE DOES NOT EXCEED FILTER MEDIA PRESSURE RATING. SHALL BE REPLACED PROMPTLY. 3, Construct the southern portion of Pond 2, the road embankment and the new Pond 2 outlet 5 TURN SILT FE"GE NP SLOP V SILT FENCE UP SLOPE AT ENDS. 3. SEDIMENT DEPOSITS SHOULD BE REMOVED WHEN DEPOSITS REACH HALF THE HEIGHT 3, FILTER MEDIA MAY BE, BUT NOT LIMITED TO, SAND MEDIA FILTRATION DEVICES, RATED OF THE BARRIER. ANY SEDIMENT DEPOSITS REMAINING IN PLACE AFTER THE SILT FILTER FABRIC BAGS OR POLYMER BASED DEWATERING PRACTICES. structure. Continue working north, towards the existing outlet structure. 6. VARE MESH S"ALL BE M.". MESH SHALL BE MIN. 13 GAGE WITH MAXIMUM 12° OPENINGS. FENCE 15 REMOVED SHALL BE DRESSED TO CONFORM TO THE EXISTING GRADE, 7. WIRE AND WASHED STONE 4. Remove unsuitable soils from the site. Spread suitable excavated material on the Middle GREATER THAN FEET ~ AND WASHED STONE IS REQUIRED TO BE SHOWN ON PLANS AT THE TDE OF SLOPES PREPARED AND SEEDED. 4. PUMP STRAINER SHALL NOT BE LN CONTACT WITH BOTTOM OF POND. 4TER THAN 10 FEET VERTICAL (2:1 SLOPE} ORANGE SAFETY FENCE IS REQUIRED AT BACK OF SILT FENCE WHEN GRADING IS LOW POINT School Athletic Field and stabilize with temporary ground cover. Stabilize the culvert outlet. a, °RA"GE SAFETY FEI ADJACENT TO STREAMS OF 4CENT TO STREAMS OR WETLANDS. THE COLOR ORANGE IS RESERVED FOR VISUAL TIFICATION OF ENNRONMENTALLY SENSITIVE AREAS. 5, Remove the existing Pond 2 outlet structure. Construct pond embankment and the 'DENTIFI°AT°" °F ENNR°" 9. DRAINAGE AREA CAN NOT WAGE AREA CAN NOT BE GREATER THAN 1/4 ACRE PER 100 FT OF FENCE. Maintenance Access Road at the northern end of the pond: 10.SL°PE LENGTHS CAN NCT 'E LENGTHS CAN NOT EXCEED CRITERIA SHOWN IN TABLE 6.62A NORTH CAROLINA 6. Excavate the embankment and construct the foreba of Pond 2. ERGSI°N A"° SEDIMENT G~ Y SIGN AND SEDIMENT CONTROL PLANNING AND DESIGN MANUAL. 5 HIGH HAZARD SILT FENCE s DEWATERING PUMP 7. Remove the existing drop inlet at the southwest corner of the athletic field. 11.°° NoT l"STALL SEDIMENT AREAS OF CONCENTRATED VOT INSTALL SEDIMENT FENCE ACROSS STREAMS, DITCHES, WATERWAYS OR OTHER EC.~ NOT TO SCALE AS OF CONCENTRATED FLOW. EC. NOT TO SCALE 8, Install the new drop inlet at the southwest corner of the athletic field and the storm drain pipe I to the forebay. Install inlet protection and stabilize the outlet at the forebay of Pond 2. 9. Remove unsuitable soils from the site. o t' t 't b C n roue o spread sui a le excavated material on the Middle School Athletic Field and stabilize with temporary ground cover. i 10. Dewater the pond as necessary Burin construction b um in the water into a silt ba . I I 9 YP p 9 9 Refer to the Erosion Control Notes & Details. I I 11. Stabilize Pond 2 and the surrounding disturbed slopes. Stabilize the culvert outlet. W2 GENERAL NOTES: C. POND 3 NOTES: END OF FLMED SECTION ~ i 1. Drain and b um in clean water to outlet structure and mudd water into silt ba as P Yp p 9 Y 9 1, UNIIFpRMLY GRADE A SHALLOW i i. RIPRAP SHOULD EXTEND UP BOTH SIDES OF THE APRON AND AROUND THE END 4' MAX. ~ I of THE PIPE oR cuLVERr Ar THE DISCHARGE ouTLEr AT A MAXIMUM SLOPE of DEPRESSION APPROACHING THE 19-GAUGE HARDWARE CLOTH i indicated on plans. 2:7 AND A HEIGHT NOT LESS THAN TWO THIRDS THE PIPE DIAMETER OR INLET, , . cuLVERr HEIGHT. MESH OPENINGS) 2. Construct Fore bay A at the southwest corner of Pond 3. Stabilize the culvert outlet., working 2 2. THERE SHALL BE NO OVERFLOW FROM THE END OF THE APRON TO THE DRIVE S-FDOT STEEL PASTS 2 - SURFACE OF THE RECEMNG CHANNEL THE AREA TO BE PAVED OR RIPRAPPED FEET INTO THE GROUND from west to east, excavate the pond, Remove unsuitable soils from the site. Store suitable SHALL BE UNDERCUT SO THAT THE INVERT OF THE APRON SHALL BE AT THE SAME GRA?E (FLUSH) WITH THE SURFACE OF THE RECEMNG CHANNEL THE SURROUNDING THE INLET, SPACE APRON SHALL HAVE A CDTOFF OR TOE WALL AT THE DOWNSTREAM END. nn~TO r, ir~u v n nni ism T~ ~r excavated material to construct/expand the berm and fill the portion of the existing pond at the r'L13 D r _V r-vL HICLIU Vll I nC 3. THE WIDTH OF THE END OF THE APRON SHALL BE EQUAL TO THE BOTTOM PERIMETER OF THE INLET, A M Filter Strip. WIDTH OF THE RECEIVING CHANNEL. MAXIMUM TAPER TO RECEIVING CHANNEL 5:1 MAXIMUM OF 4 FEET APART, NCDOT #5 OR #57 4. 3. Dewater the pond as necessary during construction by pumping the water into a silt bag. 5. 4. ALL SUBGRADE FOR STRUCTURE TO BE COMPACTED TO 95% OR GREATER. WASHED STONE N 5. THE PLACING OF FILL, EITHER LOOSE OR COMPACTED IN THE RECEIVING 3, SURROUND THE POSTS WITH WIRE Refer to the Erosion Control Notes & Details. 6. MESH HARDWARE CLOTH, SECURE CHANNEL SHALL NOT BE ALLOWED. o B B TOE WIRE MESH TO THE STEEL 6. NO BENDS OR CURVES IN THE HORIZONTAL ALIGNMENT OF THE APRON ~ J ~p Z WILL BE PERMITTED. POSTS AT THE TOP, MIDDLE, AND 4. Construct Fore bay B at the southeast corner of Pond 3. Continue constructing pond in BOTTOM, PLACING A 2-FOOT FLAP 7. FILTER FABRIC SHALL BE INSTALLED ON COMPACTED SUBGRADE PRIOR TO OF THE WIRE MESH UNDER THE westerly direction. PLACEMENT OF RIP RAP. GRAVEL FOR ANCHORING IS 8. ANY DISTURBED AREA FROM END OF APRON TO RECIEVING CHANNEL W1 RECOMMENDED, N 5. Construct the bypass Channel, Level Spreader & Filter Strip at the outlet of Pond 3. Stabilize 8. MUST BE STABILIZED. END OF APRON the outlets. USE USE USDA NOMOGRAPH FROM NC SEDIMENT AND EROSION CONTROL MANUAL 4, PLACE CLEAN GRAVEL (NC DOT #5 NCDOT #5 OR #57 PLAN OR #57 STONE) ON A 2,1 SLOPE WASHED STONE 6. Install the interceptor structures in the existing storm drain lines above Fore bay B. and OUTLET La W1 W2 T NATURAL GRADE WITH A HEIGHT OF 16 INCHES AROUND remove the existing outlets. Install the permanent storm drain line from the interceptor FILTERED WQ2 ForbY A 9 ft 14 ft 5 ft 0.8 ft W a TTOANDEVTHE WIRE, EN GRADE AND SMOOTH I structure to Fore bay B of Pond 3 and stabilize the outlet. W 2 Forb B 9 ft 0.25 ft 25 ft 0.25 ft M RIP RAP WATER 5. ONCE THE CONTRIBUTING DRAINAGE 7. Stabilize Pond 3 and the surrounding disturbed slopes. wQ2 ounEr 21 ft z3.5 ft 25 f 1.7 ft ul ;Id.X,r,~ ~ AREA HAS BEEN STABILIZED, D. COMPLETION WQ2a Forebay, 18 ft 20.5 ft 2.5 ft 1.2 ft T (THICKNESS) REMOVE ACCUMULATED SEDIMENT, nl - W42a OUTLET 9 ft 11.5 ft 2.5 ft 0.7 ft AND ESTABLISH FINAL GRADING = 1. Stabilize all disturbed areas with appropriate seed mix. WQ3 Forby A 10.5 ft 15.5 ft 5 ft 0.9 ft NOTE: LAYER OF FILTER FABRIC ELEVATIONS, WQ3 Forby B 10 ft 12.5 ft 2.5 ft 0.8 ft MINIMUM H=2J3 PIPE OIAMETER 6. COMPACT THE AREA PROPERLY AND 2. Once vegetation has been established, with the approval of the Project Manager, remove the WQ3 Bypass 8 ft 9 ft 1 ft 0.5 ft STABILIZED IT WITH silt fence and inlet protection devices. WQ3 Lvl Sprdr 12 ft 16 ft 4 ft 0.9 ft SECTION B-B GROUNDCOVER, 3. Install plantings on the littoral shelves as soon as construction is complete for each pond, and d50 (see fig 8.06 a&b "NC SEDIMENT AND EROSION CONTROL MANUAL" 7 OI ITI CT PDOTC/ /'~~MI AI'~D(~Ai dmax'.5 A5dmo 50 EC.02 ~P~trt r11 ~l'lll'A" 6 INLET PROTECTION before the end of the growing season (Nov. 15) NOTTOSCALE NOTTOSCALE i Qe d 9 i E a Rev. # Date By Description 'I I , Scale: 1 06/06/08 EDI WQ PERMITTING 1-100 (30x42) PERMITTING UNION COI 2 06/25/08 EDI WQ PERMITTING REVISIONS - - - - I COUNTY PUBLIC SCHOOLS - - Date: I FACILITIES - ^ 06-02-2008 I 0 or 116 Sheet: - 116 NORTH MAIN STREET MARVIN Construction PO Box 79133, Charlotte NC 28271 704.841.1779 ` ` f"' A MONROI )NROE, NORTH CAROLINA 28112 UNION COUNTY, NORTH CAROLINA ECO02