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Home My WebLink AboutWPO201500015 Plan - Stormwater WPO VSMP 2015-12-30 Stormwater Pollution Prevention Plan (SWPPP) Sr For Construction Activities At: Project Name: Free State Run Address: Off Free State Road Tax Map 62 Parcel 8 Prepared by: w Name: Shimp Engineering P.C. Prepared for: Name: Free State Partners, LLC. SWPPP Preparation Date: 11/19/15 ,,, (This document is to be made publicly available according to 9VAC25-880-70, Part II, section D) CONTENTS: • 1. Registration statement 2. Notice of general permit coverage 3. Nature of activity 4. Erosion and Sediment Control Plan. 5. Stormwater Management Plan 6. Pollution Prevention Plan. 7. Discharges to impaired waters, surface waters within an applicable TMDL wasteload allocation, and exceptional waters. 8. Qualified personnel 9. Signed Certification 10. Delegation of authority. 11. General permit copy 12. Inspection logs Section 1. Registration statement irr arr kit am r Registration Statement „o General VPDES Permit for Discharges of Stormwater from Construction Activities(VAR10) (Please Type or Print All Information) 1. Construction Activity Operator: (General permit coverage will be issued to this operator. The Certification in Item#12 must be signed by th appropriate pe associated with this operator.) MN Name: 1'rtG S4od INe-V5/LLC... . Contact: Mailing Address: -Pc. '30,' 6H5 am City: CJ1Ctvi&neSV i`i IP_ State: Y A Zip: 22 9VZ Phone: Email address(if available): .. Indicate if DEQ may transmit general permit correspondence electronically: Yes0 No❑ 2. Existing General Permit Registration Number(for renewals only): 3. Name and.'`ocation of the ConstructiononActivity: w Name: 1;re.e S14G_ Purl ✓I Address_(if available): N// City: CiliadlOikY1 Sv, e State: VI n, Zip: 2 2 G � 0 s County(if not located within a City): 41 b Lw*tvtt tyou.4,4 �! Latitude(decimal degrees): 4 07 02'1L° Longitude(decimal degrees): —79.0457138 0 Name and Location of all Off-site Support Activities to be covered under the general permit: r. Name: Address(if available): City: State: Zip: rr County(if not located within a City): Latitude(decimal degrees): Longitude(decimal degrees): 4. Status of the Construction Activity(check only one): Federal❑ State 0 Public El Private us 5. Nature of the Construction Activity(e.g.,commercial,industrial,residential,agricultural,oil and gas,etc.): 4,14.1 sUbJNA:S rnn 6. Name of the Receiving Water(s)and Hydrologic Unit Code(HUC): ma Name: (2.uIatlrla. tG VG/- McdaoW ateek.. Name: HUC: f5204302O404Ol HUC: 7. If the discharge is through a Municipal Separate Storm Sewer System(MS4),the name of the MS4 operator: N/A- 8. Estimated Project Start and Completion Date: Start Date(mm/dd/yyyy): Coq/0 1/Z015 Completion Date(mm/dd/yyyy): C)°1/01/Z017 ra 9. Total Land Area of Development(to the nearest one-hundredth acre): '7.09 i4c c Estimated Area to be Disturbed(to the nearest one-hundredth acre): ti0.41.1 r4GYcs 10. Is the area to be disturbed part of a larger common plan of development or sale? Yes❑ No„IW at 11. A stormwater pollution prevention plan(SWPPP) must be prepared in accordance with the requirements of the General VPDES Permit for Discharges of Stormwater from Construction Activities prior to submitting this Registration Statement. By signing this Registration Statement the operator is certifying that the SWPPP has been prepared. +a 12. Certification: "I certify under penalty of law that I have read and understand this Registration Statement and that this document and ail attachments were prepared in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief true, es accurate, and complete. I am aware that there are significant penalties for submitting false information including the possibility of fine and imprisonmeAty.knowingviolations." Printed Name: _ Title, Date: 5/t�/ ow (Please sign in IN his Certification must be signed by the appropriate person associated with the operator identified in item#1.) a• 07/2014 Page 1 of 1 e N Section 2. Notice of general permit coverage (This notice is to be posted near the main entrance according to 9VAC25-880-70, Part II, section C.) r rr rr r Section 3. Nature of activity ON THIS SITE,TMP 62-8,ARE PROPOSED SINGLE FAMILY RESIDENTIAL BUILDINGS. a■ THE TOTAL AREA OF DISTURBANCE IS 6.44 ACRES THE SITE IS CURRENTLY VACANT AND FORESTED WITH MIXED DECIDUOUS AND EVERGREEN TREES. or PHASE 1 1.INSTALL CONSTRUCTION ENTRANCE w 2.INSTALL SEDIMENT BASIN#1,PERIMETER DIVERSIONS,AND SILT FENCE 3.INSTALL SEDIMENT BASIN#2,PERIMETER DIVERSIONS,AND SILT FENCE. 4.UNTIL SEDIMENT BASINS ARE IN PLACE CLEAR ONLY THE TREES REQUIRED TO MOVE EQUIPMENT TO SEDIMENT BASINS AND CONSTRUCT BASINS. as 5.MASS GRADE SITE AND INSTALL ROADS AND UTILITIES.DO NOT CONSTRUCT PADS ON LOTS 9-12 UNTIL CURB AND GUTTER IS INSTALLED ON FREE STATE DRIVE. 5.ESTABLISH PERMANENT STABLE GRASS COVER ON FINISHED GRADE. PHASE 2 1.COMPETE ROAD AND STORM SEWER CONSTRUCTION rr 2.CONSTRUCT AND STABILIZE ALL BUILDING PADS EXCEPT LOTS 9-12 3.TEMPORARILY END STORM SEWER D3 BEFORE SEDIMENT BASIN 1 AND PROVIDE TEMPORARY RIP RAP PHASE 3 1.AFTER INSTALLATION OF CURB AND BASE STONE ON FREE STATE DRIVE,SEDIMENT BASIN#1 MAY BE all REMOVED AND LOTS 9-12 FILLED AND COMPACTED,BUT ONLY IN THE CASE THERE IS NO RAIN FORECAST FOR 4 DAYS. 2.MAINTAIN WIRE SUPPORTED SILT FENCE ON THE BACKS OF LOTS 9-14. 3.INSTALL INLET PROTECTION AND OUTLET PROTECTION ON ALL STORM SEWERS as 4.ONCE AREA ON FARROW HILL CT.IS STABILIZED,PROCEED TO CONSTRUCT BIOFILTER 5.IMPLEMENT DUST CONTROL AND TEMPORARY AND PERMANENT SEEDING MEASURES. 6.AFTER THE SITE IS DEEMED STABILIZED BY THE COUNTY INSPECTOR,SEDIMENT BASIN#1 SHALL BE CONVERTED TO A PERMANENT BIO-FILTER AS SHOWN ON THE PLANS. ar ra as era Section 4. Erosion and Sediment Control Plan. 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Co i N oD o oo = mrn Q o 0 cD 3 ii CD 43 m ii mu I 0 0 1 o !4'., l'!. / 1 I c4)1 '=., F ;'[172) m 1: ii/_,A A ,,..., t,, Viiii: } sP�i i �' N brno r • yc� N � on a _ 1 1- tt $ \ i 15 Ci] b v? , , , 0, n O 64 4.e - A A A A A A 0OO O• 1~ g oi O (O (O O O O O A Ch Oo O N A Cr) CoO 0 P co O N A a c°M n� p 2 o VSMP FOIA: EROSION CONTROL DETAILS z SHIMPENGINEERING P.C. e z3 p N = ' FREE STATE RUN 'y T ;,x $ N O Rev+ Date Description . -9 z ' z oslos lois Bid FFe'4 •‘- __, GINEERIAG-L9NDPTANNING-PROIECTMANAGEMENT 0 N ALBEMARLE COUNTY, VIRGINIA 3 08/08/2015 Canty Comments 040 D (P 4 OV/21/7015 fanfy frv,mmfa ao1 a MAIN sr, SUITE M (434) _ 5 11/19/2015 County Carments CHARLOTTeSNLLE. VA 22002 JusTINOSH MP—encineew nc C'OM Section 5. Stormwater Management Plan AM al 101 Ma r. Ian 40 PROJECT MANAGEMENT `" CIVIL ENGINEERING LAND PLANNING ENGINEERING = - November 18, 2015 �F f Mr. Justin Deel 0 Engineer County of Albemarle 0 •.I. Department of Community DevelopmentiU Nsc Nfl'451S83 Regarding: Free State Run ��o 1/ 101/6- t Ji")11 SM6 . %NAL Dear Mr. Deel, Enclosed are the revised calculations adjusted per County comments received October 19,2015 proving compliance relating to storm water quantity and quality requirements. NM Water quality standards, (9VAC25-870-65), are met by the installation of a bio filter, and the purchase of 4.91 lb/year of nutrient credits. The VDEQ Runoff Reduction Method Spreadsheet indicates that we have .. ; met minimum water quality standards by reducing the targeted amount of pollutants. In order to meet Minimum Water Quantity Standards,channel protection and flood protection needs to be addressed(9VAC25-870-33)in accordance with the following energy balance equation for natural storm water conveyance systems: QDeveloped s LF. (QPre-developed RVPre-Developed)/RVDeveloped Because the site is completely wooded,we proceeded without the improvement factor. We found the RVpre of the site by determining the longest time of concentration of the limits of the site and entering it into HydroCAD along with the pre development site conditions(completely wooded). The hydrograph determined that Qpre=4.06 cfs and RVpre=.357 ac-ft. In order to find RVpost,the site was divided into sub-drainage areas going to each SWM facility and a bypass area. These values were entered into the VDEQ RRM worksheet and then HydroCAD using the weighted CN, in which the runoff volumes were calculated for each,then summed together to get RVp0st=.791 ac.-ft. The next goal was to find the Qpost for the site:QDeveloped= (Qpredeveloped* RVpre-Developed)/RVDeveloped,we determined the required Qpost= 1.83 cfs. In addition to detaining the pre development levels, we must provide additional detention to meet the requirements of the energy balance equation. The SWM plan exceeds that requirement as shown in the table below. Summary Table for project outflows: ins Permitted Total Post-Development Pre-Development Flow to Pond 1-Yr Flow 4.06 cfs 1.83 cfs 1.79 cfs 10-Yr Flow 17.18 cfs <17.18 cfs 16.92 cfs `. rr Contents: Pre-Development Stormwater Management Calculations: Pre-Development Drainage Map Pre-Development Time of Concentration Calculations Pre-Development HydroCAD Analysis Post-Development Stormwater Management Calculations: Post-Development Drainage Map Drainage Area Summary Post-Development Time of Concentration Calculations Post-Development HydroCAD Analysis Stormwater Quality Calculations: Water Quality Map VDEQ RRM Spreadsheets Post-Development RRM HydroCAD Analysis Storm Inlet Calculations: Drainage Inlet Map VDOT LD-229 Storm Drain Design Computations VDOT LD-204 Stormwater Inlet Computations VDOT LD-347 HGL Computations Culvert Calculations: Belvedere HydroCAD Analysis Culvert Analysis VDOT 8C-1 Inlet Control Sediment Basin: Temporary Sediment Basin Design Data Worksheets Independent Reports: Excerpt from NRCS Soils Report NOAA Precipitation Report rr 110 I Ilr Pre-Development Stormwater Management Calculations Pre-Development Drainage Map r. 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N O .. _. sww• ..•.r•".. ••..o... n ncnr- ov II II a II — -- • N O W L1 II O a LENGTH "L" OF STRIP IN FEET Q (D 2 (—T r I I ) I III 1 1 I I-j-T - - _ -n O 3 co o O 9 - - N w _• rt 'q C 0 0 0 0 0 00000 0 00 CL m v L .. )O 5 9:- G) .OO r p� O�LOU U) NOu R f. tis N 0 m -) o n m M < / CFyARACTE- OF GROUND C-✓qLI.. b /U O U • -v n .5 b 'C'vgL Ut. -if, / -6 / n Ie r.'11 PIVOT LINE N ifi N — O 0 • 0 O O cn R. PERG NT SLOPE \ v _ N N W w CP J CC, lD 0 lT 0 cr 0 N i L_ 1_ 1v INLET CONCENTRATION TIME IN.MINUTES I. Y 3 w`? a i S P Slope mat) 1 n 4 nn cu o cors - Ir 1 ' 3 c a L II II n II o w ? = kit rt (D O fi 3 3 �. 0.2 .-- I a Ln r.< CD I I cr f = ; 0 cp O) Ia. I ?1 d w4y _... e � < _ 2CD 0 O = ' 0 f ''',4yhfg t 11Ji I,r�„i •✓ _� Z R 1111 -.),nh %),4l. S y y i 1n by 4n _v,,p E 12. i ,-,' Z y t� °`” i�'r �" amu° $ Y i 1 rt �4 J v M A. ; 4 3 0' ., _ aap^`mss r,a 4, • p 1 4/4.,_ '',�R w� 3 S a 20rir V. . a `' 1, NO 'a fig, r3 8 - :T =s 4 . E 2 Oa r. Oa IN 1992 it 35 1 30 111, o .z 25— 'o.s - 300 '5 Yr ` 200 `'0d��'• • 20 -t_ - N ti ani 4.2 w- N9usfaaa1-5-.4 0.5:6 z- 19005 a 4 1.0-0 �� a- 80 Dens. ' a .---- z / -IP z- 70 Gr."—= S.0 1- U/— 60 S /� I O'I� y i nd– 50 v '..r— 40 I 0 1—_ 30 • :7. 8 - 20 or .. 7 10 6- 1 OVERLAND FLOW THE a. (Seellye Chart) Suorce: data Hook for Civ(1 Eedneeta.E.E.Seelya Plate 5-1 - v-11 MI MO Pre Development (offsite): Overland Flow w L = 186' Slope = 7.5% C = .3 Forested HSGC and HSGB Tc = 11.5 min me ire r. i am ism r rim < #1 > K#1 Pre- Drainage Pre-Offsite Drainage <SubCatj Reach on• 111: Drainage Diagram for Free State Run(Pre-Dev.) \ Prepared by Shimp Engineering P.C., Printed 11/18/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC rr Free State Run(Pre-Dev.) Type 1124-hr 1 year storm Rainfall=3.02" - Prepared by Shimp Engineering P.C. Printed 11/18/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment#1: Pre- Drainage Runoff = 4.06 cfs @ 12.15 hrs, Volume= 0.357 af, Depth> 0.63" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 1 year storm Rainfall=3.02" Area(ac) CN Description * 1.440 55 Woods, Fair, HSG B * 4.410 70 Woods, Fair, HSG C 0.150 98 Unconnected roofs, HSG C 0.520 72 1/3 acre lots, 30%imp, HSG B 0.250 81 1/3 acre lots, 30%imp, HSG C 6.770 68 Weighted Average 6.389 94.37% Pervious Area - 0.381 5.63% Impervious Area 0.150 39.37%Unconnected Tc Length Slope Velocity Capacity Description r" (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 200 0.25 Direct Entry,Overland 5.9 Direct Entry,Shallow 19.4 200 Total Summary for Subcatchment#1A: Pre-Offsite Drainage Runoff = 1.08 cfs @ 12.06 hrs, Volume= 0.074 af, Depth> 0.55" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs arg Type II 24-hr 1 year storm Rainfall=3.02" Area(ac) CN Description 1.220 70 Woods, Good, HSG C 1011 0.390 55 Woods, Good, HSG B 1.610 66 Weighted Average 1.610 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) r■ 11.5 Direct Entry,Overland Nal r.. irr Free State Run(Pre-Dev.) Type 1124-hr 10 year storm Rainfall=5.57" Prepared by Shimp Engineering P.C. Printed 11/18/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment#1: Pre- Drainage Runoff = 17.18 cfs @ 12.13 hrs, Volume= 1.288 af, Depth> 2.28" - Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" Area(ac) CN Description * 1.440 55 Woods, Fair, HSG B * 4.410 70 Woods, Fair, HSG C 0.150 98 Unconnected roofs, HSG C ,`,,,, 0.520 72 1/3 acre lots, 30%imp, HSG B 0.250 81 1/3 acre lots, 30%imp, HSG C 6.770 68 Weighted Average 6.389 94.37% Pervious Area 0.381 5.63% Impervious Area 0.150 39.37% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 200 0.25 Direct Entry,Overland 5.9 Direct Entry,Shallow +� 19.4 200 Total Summary for Subcatchment#1 A: Pre-Offsite Drainage Runoff = 4.89 cfs @ 12.04 hrs, Volume= 0.284 af, Depth> 2.12" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" Area(ac) CN Description 1.220 70 Woods, Good, HSG C 0.390 55 Woods, Good, HSG B 1.610 66 Weighted Average 1.610 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.5 Direct Entry,Overland rr i• rr Post-Development Stormwater Management Calculations Post-Development Drainage Map Drainage Area Summary Post-Development Time of Concentration Calculations AN Post-Development HydroCAD Analysis In mu Drainage Area Summary Free State Run Storage Pipe Drainage Area (#2) Forebay Drainage Area(before Detention)(#4) Managed Turf, B 0.08 Impervious, B 0.21 Managed Turf,C 0.52 Impervious,C 0.93 Impervious, B 0.14 1/3 Ac. Lots, B 0.16 Impervious,C 1.07 Managed Turf, B 0.19 TOTAL: 1.81 Managed Turf,C 0.84 1/3 Ac. Lots,C 0.14 Woods,C 0.17 Detention Pond Drainage Area(#4A) TOTAL: 2.64 Managed Turf,C 0.4 Woods,C 0.09 Biofilter Drainage Area(#3) Impervious,C 0.11 1/3 Ac. Lots, B 0.1 TOTAL 0.6 Managed Turf,B 0.31 Managed Turf,C 0.03 Woods, B 0.12 Impervious, B 0.19 Impervious,C 0.04 TOTAL: 0.79 Pond(Untreated)Drainage Area(#1) Managed Turf, B 0.25 Managed Turf,C 0.34 Impervious, B 0.08 Impervious,C 0.1 Forest,C 0.31 TOTAL: 1.08 rr OM�r. rr 1 ..,..:, \\\ ,..., \ ,, 4,1/4,, \s z , \, , ,, ‘. \ , _\ , .,s,„,. / , . „ , ,,,,,, J.., .NN• ‘,,L,-. \ 'ss, ..,, / `,(-'" m D _ • ,atelj? 7 on , -----_____ _- - - . 4\ ‘z ,-- --„„ zz,:.:-...F- :,_sE.s__.-E,_ ________ ___- \ ,‘ Ao , ___ __ _______ , N\ •Airstr. sAsz..., ,,„,:..... -,.._• , - D D-- D ( „--, k •44. ,,,s __,:,_,.- (.1) __. , 2------- \ 411,, .\ t.4 ,6,4,7<7.4‘,..-,'' ------------------------------ 1 LI-D ‘11 a ( // / \ \ I \ .', 4:\ ss ------ 16.7 4,_/#--A-4---,4„,.. ..... ..lie.b-iiiik .,--- k,._. 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Post Development (to pond): Overland Flow L = 183.7' Slope = 20% C = Grass/Woods, HSGC Tc = 10.2min rr c C) Nrp "EI - - -- — r II r p 5,, LENGTH "L" OF STRIP IN FEET P I I O a A l' , , , , I , ,,,I , 1 TT-TT -T --- - D fJ C _ / N w 3 � A 2 0 0 0 0 0 0 0 000 0 o • 5' m 3 N r O Om 0O Ort '" N. .aa Liu21' o° Cn O nm� na-. a O ri < r CHARACTER OF GROUND OO G. T c vn�cc i�. a u • ., o a c'n1cfK a r D C) R g •CIDr n g 1 PIVOT LINE 0 \ Z H N i' N — O .g! 0 + 0 0 0 in m P7*CENT SLOPE -o \ AT \ N N cd oi �1 (A SO 0 O N O LT .i. (_ 1.—1.___L__ IJ INLET CONCENTRATION TIME IN MINUTES 1' Netgbt of Rost Aercte Point Abora Dot1.t 0 = Ci II �' t6 it 7 ' C/1 S rt g1 n _ . 7 3W • f T " V o fo g; e .. 3 5. m 1i p 3 _ CO CD 3 F.F. d r rt m O g' "O \V d 9 w r a /<}\ O 'Maximum Length of Travel {� i 8 E 8 1 8 S '1 075 g Time of Concentration ♦V ' 1 1 r 1 I ( 1 1If IrIq11. ,IR( I „ s "g : r-r Y' _ p u N D COIt 14111 rr 141111 Post Development D.A. #4 1992 ria 35— '3 30sr Paved `2 25— 300 Bare `0 _ r 200 Sodom• 20 Poor r- - Gra. .3 w as IA- On z- 00 Surface t- 1.031 15,4 onus N etr N_ TO \ 5.0�5 P. o r 50 20 0. 40 10 r 1—— 30 9-- W. 20 6- NO _ 7 10 6— "" i OVERLAID FLOW TNIE (Seeb4 ) Source: Data Boot far L9vf F.ngineam 6.E Seelye Plate 5-1 etti V•11 rre .r Post Development (To Sediment Forebay): Overland Flow L = 196.5 e• Slope = 12.2% C = 1/3 Acre Lots/Forest, HSGB Tc = 10.2 min em + Assumed .5 min from pipe flow ar .r .. Post Development D.A. # 4A ime 1992 N. F ti 35— l t I 30= ter Paved— q - 2S— o 300 •0 -.7 sir ware - B 'O 20-w ` 200 sdl-d.5.• - F - N Grose - .s _ N,4urfaa_ti res - - w Gross :to z- 100Surface s F 1.0_$ �h H . 1 _ 70 Crane�_y 50 Z r MI �— 60 W e or SO o. V 10— '-- 30 ►- 1'4 W,- J_ 20 8 all 1 7_ 1 — 10 6— ram 1 OVERLAND FLOW TIME Sauroe: Data Book for Civil Engineer&E.E.Seelye Plate 5-1 in V-11 NO OM Post Development (to detention pond): Overland Flow iwo L = 91.5' Slope = 25.1% C = Managed Turf, HSGC Tc = 9.0 min mur Ire me am ea w en (#4A)eti / 7aY?ea Post-Offsite Drainage r 1P is Sediment Forebay am 2P 3P i #3 Det ntion Pond BioFilter BioFilter Drainage Area ire 4P ` #2I ma Mil I4 Untreated Storm Pipe Detention Pipe Area Point Of Analysis rr <#1 > ow Untreated Drainage Area or am am w CubCat) Reach 'on. it Drainage Diagram for Free State Run(Post w-offsite) Prepared by Shimp Engineering P.C., Printed 11/19/2015 mel HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC r rr. Free State Run(Post w-offsite) Type 1124-hr 1 year storm Rainfall=3.02" +r Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment#1: Untreated Drainage Area Runoff = 1.18 cfs @ 12.03 hrs, Volume= 0.069 af, Depth> 0.77" +�• Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 1 year storm Rainfall=3.02" Area(ac) CN Description rr 0.250 61 >75%Grass cover, Good, HSG B 0.340 74 >75%Grass cover, Good, HSG C 0.080 98 Unconnected pavement, HSG B 0.100 98 Unconnected pavement, HSG C 0.310 70 Woods, Good, HSG C 1.080 74 Weighted Average, UI Adjusted CN = 71 0.900 83.33% Pervious Area 0.180 16.67% Impervious Area 0.180 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.2 Direct Entry,Overland Summary for Subcatchment#2: Untreated Storm Pipe Area Runoff = 6.11 cfs @ 11.95 hrs, Volume= 0.289 af, Depth> 1.92" rr Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs,dt=0.05 hrs Type II 24-hr 1 year storm Rainfall=3.02" r Area(ac) CN Description 1.070 98 Unconnected pavement, HSG C 0.520 74 >75%Grass cover, Good, HSG C 0.140 98 Unconnected pavement, HSG B 0.080 61 >75%Grass cover, Good, HSG B 1.810 89 Weighted Average 0.600 33.15%Pervious Area 1.210 66.85% Impervious Area 1.210 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry,Assumption Summary for Subcatchment#3: BioFilter Drainage Area Runoff = 0.92 cfs @ 12.05 hrs, Volume= 0.057 af, Depth> 0.87" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 1 year storm Rainfall=3.02" 011 r Free State Run(Post w-offsite) Type 1124-hr 1 year storm Rainfall=3.02" Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Paae 3 Area(ac) CN Description 0.040 98 Paved parking, HSG C 0.100 72 1/3 acre lots, 30%imp, HSG B 0.120 58 Woods/grass comb., Good, HSG B 0.310 61 >75%Grass cover, Good, HSG B 0.030 74 >75%Grass cover, Good, HSG C 0.190 98 Unconnected pavement, HSG B 0.790 73 Weighted Average 0.530 67.09% Pervious Area 0.260 32.91% Impervious Area 0.190 73.08% Unconnected air Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.9 Direct Entry,Overland 1.3 Direct Entry,Shallow 12.2 0 Total Summary for Subcatchment#4: Forebay Area Runoff = 5.71 cfs @ 12.03 hrs, Volume= 0.321 af, Depth> 1.46" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs,dt=0.05 hrs Type II 24-hr 1 year storm Rainfall=3.02" Area(ac) CN Description tai 0.160 72 1/3 acre lots, 30%imp, HSG B 0.210 98 Unconnected pavement, HSG B 0.930 98 Unconnected pavement, HSG C 0.190 61 >75%Grass cover, Good,HSG B 0.840 74 >75%Grass cover, Good, HSG C 0.170 70 Woods, Good, HSG C 0.140 81 1/3 acre lots, 30%imp, HSG C "" 2.640 83 Weighted Average 1.410 53.41% Pervious Area 1.230 46.59% Impervious Area 1.140 92.68% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.7 Direct Entry,Overland+Channel Summary for Subcatchment#4A: Detention Pond Drainage Area w Runoff = 0.96 cfs @ 12.01 hrs, Volume= 0.051 af, Depth> 1.03" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 1 year storm Rainfall=3.02" ir. Free State Run(Post w-offsite) Type/l 24-hr 1 year storm Rainfall=3.02" Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 4 Area(ac) CN Description tri` 0.110 98 Unconnected roofs, HSG C 0.400 74 >75%Grass cover, Good, HSG C 0.090 70 Woods, Good, HSG C +r, 0.600 78 Weighted Average, UI Adjusted CN =76 0.490 81.67% Pervious Area 0.110 18.33% Impervious Area 0.110 100.00% Unconnected stir Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 Direct Entry,Overland Summary for Subcatchment#5: Post- Offsite Drainage Runoff = 1.27 cfs @ 11.97 hrs, Volume= 0.060 af, Depth> 0.92" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs au Type II 24-hr 1 year storm Rainfall=3.02" Area(ac) CN Description 0.150 98 Unconnected pavement, HSG C 0.050 98 Unconnected roofs, HSG B 0.440 74 >75%Grass cover, Good, HSG C 0.140 61 >75%Grass cover, Good, HSG B 0.780 78 Weighted Average, UI Adjusted CN = 74 0.580 74.36% Pervious Area 0.200 25.64% Impervious Area 0.200 100.00%Unconnected rr Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Summary for Link 1 L: Point Of Analysis Inflow Area= 6.920 ac, 43.21% Impervious, Inflow Depth > 1.14" for 1 year storm event Inflow = 1.79 cfs @ 12.05 hrs, Volume= 0.658 af Primary = 1.79 cfs @ 12.05 hrs, Volume= 0.658 af, Atten=0%, Lag= 0.0 min ` Primary outflow= Inflow, Time Span=0.00-24.00 hrs, dt=0.05 hrs Summary for Pond 1 P: Sediment Forebay Inflow Area= 2.640 ac, 46.59%Impervious, Inflow Depth> 1.46" for 1 year storm event Inflow = 5.71 cfs @ 12.03 hrs, Volume= 0.321 af r Outflow = 5.71 cfs @ 12.07 hrs, Volume= 0.232 af, Atten=0%, Lag=2.5 min Primary = 5.71 cfs @ 12.07 hrs, Volume= 0.232 af Routing by Stor-Ind method,Time Span=0.00-24.00 hrs, dt=0.05 hrs/2 nr Peak Elev=406.63'@ 12.07 hrs Surf.Area= 1,593 sf Storage=3,760 cf Plug-Flow detention time= 151.8 min calculated for 0.232 af (72%of inflow) Center-of-Mass det.time=51.5 min(886.8-835.3) tir w Free State Run(Post w-offsite) Type 1124-hr 1 year storm Rainfall=3.02" -• Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 5 "" Volume Invert Avail.Storage Storage Description #1 403.00' 4,368 cf Custom Stage Data(Prismatic) Listed below(Recalc) Ail Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 403.00 510 0 0 406.00 1,371 2,822 2,822 N I 407.00 1,722 1,547 4,368 Device Routing Invert Outlet Devices - #1 Primary 406.50' 48.0'long x 2.0'breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 Coef. (English) 2.54 2.61 2.61 2.60 2.66 2.70 2.77 2.89 2.88 es 2.85 3.07 3.20 3.32 primary OutFlow Max=4.97 cfs @ 12.07 hrs HW=406.62' (Free Discharge) i 1=Broad-Crested Rectangular Weir (Weir Controls 4.97 cfs @ 0.87 fps) Summary for Pond 2P: Detention Pond ii Inflow Area= 3.240 ac, 41.36% Impervious, Inflow Depth> 1.05" for 1 year storm event Inflow = 6.52 cfs @ 12.07 hrs, Volume= 0.283 of Outflow = 0.36 cfs @ 13.53 hrs, Volume= 0.267 af, Atten=94%, Lag=88.1 min d Primary = 0.36 cfs @ 13.53 hrs, Volume= 0.267 af Routing by Stor-Ind method, Time Span=0.00-24.00 hrs, dt=0.05 hrs/2 Peak Elev=402.44'@ 13.53 hrs Surf.Area=2,487 sf Storage=4,953 cf r Plug-Flow detention time= 175.1 min calculated for 0.267 af(94%of inflow) Center-of-Mass det. time= 144.9 min ( 1,026.3 -881.4) EN Volume Invert Avail.Storage Storage Description #1 400.00' 20,892 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store mg (feet) (sq-ft) (cubic-feet) (cubic-feet) 400.00 1,600 0 0 400.50 1,765 841 841 - 402.00 2,305 3,053 3,894 404.00 3,130 5,435 9,329 406.00 4,085 7,215 16,544 407.00 4,612 4,349 20,892 OM Device Routing Invert Outlet Devices #1 Primary 399.50' 15.0" Round Culvert L=56.0' Ke=0.400 n. Inlet/Outlet Invert=399.50'/396.00' S=0.0625'/' Cc=0.900 n=0.013 #2 Device 1 400.00' 3.0"Vert. 1 Year Orifice C=0.600 #3 Device 1 403.00' 1.0'long 10 year Weir 2 End Contraction(s) i. #4 Primary 405.30' 48.0"Vert.Standpipe C=0.600 #5 Primary 405.35' 12.0'long x 12.0'breadth RipRap Lined Emergency Spillway Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 w Coef. (English) 2.57 2.62 2.70 2.67 2.66 2.67 2.66 2.64 in Free State Run(Post w-offsite) Type 1124-hr 1 year storm Rainfall=3.02" +. Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 6 - rimary OutFlow Max=0.36 cfs @ 13.53 hrs HW=402.44' (Free Discharge) Culvert (Passes 0.36 cfs of 9.64 cfs potential flow) 2=1 Year Orifice (Orifice Controls 0.36 cfs @ 7.33 fps) to 3=10 year Weir ( Controls 0.00 cfs) =Standpipe (Controls 0.00 cfs) =RipRap Lined Emergency Spillway (Controls 0.00 cfs) MI Summary for Pond 3P: BioFilter Inflow Area= 0.790 ac, 32.91% Impervious, Inflow Depth> 0.87" for 1 year storm event Inflow = 0.92 cfs @ 12.05 hrs, Volume= 0.057 af go Outflow = 0.17 cfs @ 12.47 hrs, Volume= 0.033 af, Atten=81%, Lag=25.1 min Primary = 0.17 cfs @ 12.47 hrs, Volume= 0.033 af to Routing by Stor-Ind method,Time Span=0.00-24.00 hrs, dt=0.05 hrs Peak Elev=431.13'@ 12.47 hrs Surf.Area= 1,979 sf Storage= 1,055 cf Plug-Flow detention time=237.4 min calculated for 0.033 af (59%of inflow) to Center-of-Mass det. time= 104.9 min (974.4-869.5) Volume Invert Avail.Storaqe Storage Description ,o,,, #1 426.25' 123 cf Gravel(Prismatic) Listed below(Recalc) 308 cf Overall x 40.0%Voids #2 427.25' 420 cf Biofilter Mix(Prismatic) Listed below(Recalc) 1,680 cf Overall x 25.0%Voids - #3 430.50' 1,493 cf Surface(Prismatic) Listed below(Recalc) 2,036 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store ill (feet) (sq-ft) (cubic-feet) (cubic-feet) 426.25 266 0 0 427.25 350 308 308 to Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 427.25 350 0 0 - 430.50 684 1,680 1,680 Elevation Surf.Area Inc.Store Cum.Store ow (feet) (sq-ft) (cubic-feet) (cubic-feet) 430.50 684 0 0 432.00 1,306 1,493 1,493 ms Device Routing Invert Outlet Devices #1 Primary 425.50' 15.0" Round Culvert L=35.8' Ke=0.400 Inlet/Outlet Invert=425.50'/424.40' S=0.0307'/' Cc=0.900 ,, n=0.013 #2 Device 1 431.10' 36.0"Horiz.Standpipe C=0.600 Limited to weir flow at low heads i. rimary OutFlow Max=0.14 cfs @ 12.47 hrs HW=431.13' (Free Discharge) T1=Culvert (Passes 0.14 cfs of 14.16 cfs potential flow) t2=Standpipe (Weir Controls 0.14 cfs @ 0.55 fps) to to Free State Run(Post w-offsite) Type 1124-hr 1 year storm Rainfall=3.02" Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 7 Summary for Pond 4P: Detention Pipe Inflow Area= 2.600 ac, 56.54% Impervious, Inflow Depth> 1.49" for 1 year storm event Inflow = 6.11 cfs @ 11.95 hrs, Volume= 0.322 af a• Outflow = 0.48 cfs @ 12.73 hrs, Volume= 0.322 af, Atten=92%, Lag=46.5 min Primary = 0.48 cfs @ 12.73 hrs, Volume= 0.322 of Routing by Stor-Ind method,Time Span=0.00-24.00 hrs, dt=0.05 hrs Peak Elev=417.11'@ 12.73 hrs Surf.Area= 1,751 sf Storage=5,665 cf Plug-Flow detention time= 117.1 min calculated for 0.321 af (100%of inflow) Center-of-Mass det. time= 116.0 min (942.0- 826.0) Volume Invert Avail.Storage Storage Description #1 412.80' 11,008 cf 96.0" D x 219.01 Pipe Storage S=0.0020'/' Device Routing Invert Outlet Devices #1 Primary 412.80' 15.0" Round Culvert L.93.0' Ke=0.400 Inlet/Outlet Invert=412.80'/409.50' S= 0.0355'/' Cc= 0.900 n=0.013 #2 Device 1 412.80' 3.0"Vert. 1 yr orifice C=0.600 #3 Device 1 417.20' 12.6"Vert. 10 year orifice C=0.600 ,,. #4 Device 1 420.78' 24.0"Horiz.Overflow Standpipe C=0.600 Limited to weir flow at low heads rimary OutFlow Max=0.48 cfs @ 12.73 hrs HW=417.11' (Free Discharge) «. =Culvert (Passes 0.48 cfs of 12.15 cfs potential flow) 2=1 yr orifice (Orifice Controls 0.48 cfs @ 9.85 fps) 3=10 year orifice (Controls 0.00 cfs) =Overflow Standpipe (Controls 0.00 cfs) rr rr VI Free State Run(Post w-offsite) Type/l 24-hr 10 year storm Rainfall=5.57" +�• Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment#1: Untreated Drainage Area OM Runoff = 4.15 cfs @ 12.02 hrs, Volume= 0.229 af, Depth> 2.55" .. Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" Area(ac) CN Description irms 0.250 61 >75%Grass cover, Good, HSG B 0.340 74 >75%Grass cover, Good, HSG C 0.080 98 Unconnected pavement, HSG B 0.100 98 Unconnected pavement, HSG C 0.310 70 Woods, Good, HSG C 1.080 74 Weighted Average, UI Adjusted CN = 71 0.900 83.33% Pervious Area ""' 0.180 16.67%Impervious Area 0.180 100.00% Unconnected Tc Length Slope Velocity Capacity Description WA (min) (feet) (ft/ft) (ft/sec) (cfs) 10.2 Direct Entry,Overland us Summary for Subcatchment#2: Untreated Storm Pipe Area Runoff = 13.14 cfs @ 11.95 hrs, Volume= 0.651 af, Depth> 4.32" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" tea Area(ac) CN Description 1.070 98 Unconnected pavement, HSG C 0.520 74 >75%Grass cover, Good, HSG C 0.140 98 Unconnected pavement, HSG B 0.080 61 >75%Grass cover, Good, HSG B 1.810 89 Weighted Average 0.600 33.15% Pervious Area 1.210 66.85% Impervious Area 1.210 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry,Assumption ire Summary for Subcatchment#3: BioFilter Drainage Area Runoff = 3.05 cfs @ 12.04 hrs, Volume= 0.180 af, Depth> 2.73" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" w a Free State Run(Post w-offsite) Type 1124-hr 10 year storm Rainfall=5.57" Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 9 Area(ac) CN Description 0.040 98 Paved parking, HSG C 0.100 72 1/3 acre lots, 30%imp, HSG B 0.120 58 Woods/grass comb., Good, HSG B rrt 0.310 61 >75%Grass cover, Good, HSG B 0.030 74 >75%Grass cover, Good, HSG C 0.190 98 Unconnected pavement, HSG B 0.790 73 Weighted Average 0.530 67.09% Pervious Area 0.260 32.91% Impervious Area 0.190 73.08%Unconnected rr Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.9 Direct Entry,Overland 1.3 Direct Entry,Shallow 12.2 0 Total Summary for Subcatchment#4: Forebay Area Runoff = 14.13 cfs @ 12.02 hrs, Volume= 0.811 af, Depth> 3.69" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" Area(ac) CN Description 0.160 72 1/3 acre lots, 30%imp, HSG B 0.210 98 Unconnected pavement, HSG B 0.930 98 Unconnected pavement, HSG C 0.190 61 >75%Grass cover, Good, HSG B 0.840 74 >75%Grass cover, Good, HSG C 0.170 70 Woods, Good, HSG C 0.140 81 1/3 acre lots, 30%imp, HSG C 2.640 83 Weighted Average 1.410 53.41% Pervious Area 1.230 46.59% Impervious Area r. 1.140 92.68% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.7 Direct Entry,Overland+Channel Summary for Subcatchment#4A: Detention Pond Drainage Area Runoff = 2.84 cfs @ 12.00 hrs, Volume= 0.150 af, Depth> 3.01" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" rr Free State Run(Post w-offsite) Type 1124-hr 10 year storm Rainfall=5.57" ..r Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 10 Area(ac) CN Description 0.110 98 Unconnected roofs, HSG C 0.400 74 >75%Grass cover, Good, HSG C 0.090 70 Woods, Good, HSG C 0.600 78 Weighted Average, UI Adjusted CN =76 0.490 81.67% Pervious Area 0.110 18.33% Impervious Area 0.110 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 Direct Entry,Overland Summary for Subcatchment#5: Post-Offsite Drainage Runoff = 3.96 cfs @ 11.96 hrs, Volume= 0.184 af, Depth> 2.82" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" Area(ac) CN Description 0.150 98 Unconnected pavement, HSG C 1111 0.050 98 Unconnected roofs, HSG B 0.440 74 >75%Grass cover, Good, HSG C 0.140 61 >75%Grass cover, Good, HSG B 0.780 78 Weighted Average, UI Adjusted CN =74 0.580 74.36% Pervious Area 0.200 25.64% Impervious Area 0.200 100.00% Unconnected in Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) r. 5.0 Direct Entry, Summary for Link 1 L: Point Of Analysis Inflow Area= 6.920 ac, 43.21% Impervious, Inflow Depth > 3.17" for 10 year storm event Inflow = 16.92 cfs @ 12.08 hrs, Volume= 1.826 af Primary = 16.92 cfs @ 12.08 hrs, Volume= 1.826 af, Atten=0%, Lag= 0.0 min " Primary outflow= Inflow, Time Span=0.00-24.00 hrs,dt=0.05 hrs Summary for Pond 1 P: Sediment Forebay Inflow Area= 2.640 ac, 46.59% Impervious, Inflow Depth> 3.69" for 10 year storm event Inflow = 14.13 cfs @ 12.02 hrs, Volume= 0.811 af Outflow = 13.95 cfs @ 12.02 hrs, Volume= 0.730 af, Atten= 1%, Lag=0.2 min fig Primary = 13.95 cfs @ 12.02 hrs, Volume= 0.730 af Routing by Stor-Ind method, Time Span=0.00-24.00 hrs,dt=0.05 hrs/2 Peak Elev=406.73'@ 12.02 hrs Surf.Area= 1,629 sf Storage=3,924 cf Plug-Flow detention time=72.4 min calculated for 0.730 af(90%of inflow) Center-of-Mass det. time=22.3 min(831.3 -809.0) rr Free State Run(Post w-offsite) Type 1124-hr 10 year storm Rainfall=5.57" Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 11 Volume Invert Avail.Storage Storage Description #1 403.00' 4,368 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 403.00 510 0 0 406.00 1,371 2,822 2,822 407.00 1,722 1,547 4,368 Device Routing Invert Outlet Devices #1 Primary 406.50' 48.0'long x 2.0'breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 Coef. (English) 2.54 2.61 2.61 2.60 2.66 2.70 2.77 2.89 2.88 +�+ 2.85 3.07 3.20 3.32 primary OutFlow Max=13.59 cfs @ 12.02 hrs HW=406.73' (Free Discharge) 1=Broad-Crested Rectangular Weir (Weir Controls 13.59 cfs @ 1.23 fps) rr Summary for Pond 2P: Detention Pond +u Inflow Area= 3.240 ac, 41.36% Impervious, Inflow Depth> 3.26" for 10 year storm event Inflow = 16.75 cfs @ 12.02 hrs, Volume= 0.880 af Outflow = 6.68 cfs @ 12.18 hrs, Volume= 0.805 af, Atten=60%, Lag=9.8 min Primary = 6.68 cfs @ 12.18 hrs, Volume= 0.805 af Routing by Stor-Ind method, Time Span=0.00-24.00 hrs, dt=0.05 hrs/2 Peak Elev=405.29'@ 12.18 hrs Surf.Area=3,746 sf Storage= 13,766 cf Plug-Flow detention time= 114.1 min calculated for 0.805 af (91%of inflow) Center-of-Mass det. time= 70.3 min (900.6-830.4) rr Volume Invert Avail.Storage Storage Description #1 400.00' 20,892 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store al (feet) (sq-ft) (cubic-feet) (cubic-feet) 400.00 1,600 0 0 400.50 1,765 841 841 r.. 402.00 2,305 3,053 3,894 404.00 3,130 5,435 9,329 406.00 4,085 7,215 16,544 407.00 4,612 4,349 20,892 Device Routing Invert Outlet Devices #1 Primary 399.50' 15.0" Round Culvert L=56.0' Ke=0.400 Inlet/Outlet Invert=399.50'/396.00' S=0.0625'/' Cc=0.900 n=0.013 #2 Device 1 400.00' 3.0"Vert. 1 Year Orifice C=0.600 #3 Device 1 403.00' 1.0'long 10 year Weir 2 End Contraction(s) #4 Primary 405.30' 48.0"Vert.Standpipe C=0.600 #5 Primary 405.35' 12.0'long x 12.0'breadth RipRap Lined Emergency Spillway Head(feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.57 2.62 2.70 2.67 2.66 2.67 2.66 2.64 r.r rr aaa Free State Run(Post w-offsite) Type II 24-hr 10 year storm Rainfall=5.57" sr Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 sin 07054 ?2011 HydroCAD Software Solutions LLC Page 12 "" rimary OutFlow Max=6.66 cfs @ 12.18 hrs HW=405.28' (Free Discharge) =Culvert (Passes 6.66 cfs of 14.37 cfs potential flow) 2=1 Year Orifice (Orifice Controls 0.54 cfs @ 10.93 fps) 3=10 year Weir (Weir Controls 6.12 cfs @ 4.94 fps) NA =Standpipe (Controls 0.00 cfs) 5=RipRap Lined Emergency Spillway (Controls 0.00 cfs) 01. Summary for Pond 3P: BioFilter Inflow Area= 0.790 ac, 32.91% Impervious, Inflow Depth> 2.73" for 10 year storm event Inflow = 3.05 cfs @ 12.04 hrs, Volume= 0.180 af iiii Outflow = 3.02 cfs @ 12.06 hrs, Volume= 0.156 af, Atten= 1%, Lag= 0.8 min Primary = 3.02 cfs @ 12.06 hrs, Volume= 0.156 of rad Routing by Stor-Ind method, Time Span=0.00-24.00 hrs,dt=0.05 hrs Peak Elev=431.31'@ 12.06 hrs Surf.Area=2,055 sf Storage= 1,236 cf Plug-Flow detention time=86.2 min calculated for 0.156 af(87%of inflow) - Center-of-Mass det.time=23.8 min (859.2-835.4) Volume Invert Avail.Storaqe Storage Description IA #1 426.25' 123 cf Gravel(Prismatic) Listed below(Recalc) 308 cf Overall x 40.0%Voids #2 427.25' 420 cf Biofilter Mix(Prismatic) Listed below(Recalc) 1,680 cf Overall x 25.0%Voids as #3 430.50' 1,493 cf Surface(Prismatic) Listed below(Recalc) 2,036 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store in (feet) (sq-ft) (cubic-feet) (cubic-feet) 426.25 266 0 0 427.25 350 308 308 ilia Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 427.25 350 0 0 ao 430.50 684 1,680 1,680 Elevation Surf.Area Inc.Store Cum.Store dill (feet) (sq-ft) (cubic-feet) (cubic-feet) 430.50 684 0 0 432.00 1,306 1,493 1,493 re Device Routing Invert Outlet Devices #1 Primary 425.50' 15.0" Round Culvert L=35.8' Ke=0.400 Inlet/Outlet Invert=425.50'/424.40' S=0.0307'1 Cc= 0.900 ismn=0.013 #2 Device 1 431.10' 36.0"Horiz.Standpipe C=0.600 Limited to weir flow at low heads - printery OutFlow Max=2.98 cfs @ 12.06 hrs HW=431.31' (Free Discharge) Culvert (Passes 2.98 cfs of 14.42 cfs potential flow) 2=Standpipe (Weir Controls 2.98 cfs @ 1.50 fps) ria rr Free State Run(Post w-offsite) Type 1124-hr 10 year storm Rainfall=5.57" •• Prepared by Shimp Engineering P.C. Printed 11/19/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Paae 13 Summary for Pond 4P: Detention Pipe rI. Inflow Area= 2.600 ac, 56.54% Impervious, Inflow Depth > 3.72" for 10 year storm event Inflow = 15.29 cfs @ 11.96 hrs, Volume= 0.807 af - Outflow = 7.72 cfs @ 12.07 hrs, Volume= 0.792 af, Atten=50%, Lag=6.5 min Primary = 7.72 cfs @ 12.07 hrs, Volume= 0.792 af Routing by Stor-Ind method, Time Span=0.00-24.00 hrs, dt=0.05 hrs Peak Elev=420.59'@ 12.07 hrs Surf.Area= 781 sf Storage= 10,771 cf Plug-Flow detention time=88.9 min calculated for 0.790 af (98%of inflow) Center-of-Mass det. time=77.2 min (877.3 -800.2) Volume Invert Avail.Storage Storage Description #1 412.80' 11,008 cf 96.0" D x 219.0'L Pipe Storage S=0.0020'/' Device Routing Invert Outlet Devices #1 Primary 412.80' 15.0" Round Culvert L=93.0' Ke=0.400 Inlet/Outlet Invert=412.80'/409.50' S=0.0355'/' Cc= 0.900 NO n=0.013 #2 Device 1 412.80' 3.0"Vert. 1 yr orifice C=0.600 #3 Device 1 417.20' 12.6"Vert.10 year orifice C=0.600 ,r„ #4 Device 1 420.78' 24.0"Horiz.Overflow Standpipe C=0.600 Limited to weir flow at low heads primary OutFlow Max=7.59 cfs @ 12.07 hrs HW=420.49' (Free Discharge) rr t=Culvert (Passes 7.59 cfs of 16.27 cfs potential flow) -2=1 yr orifice (Orifice Controls 0.65 cfs @ 13.25 fps) -3=10 year orifice (Orifice Controls 6.94 cfs @ 8.01 fps) -4=Overflow Standpipe (Controls 0.00 cfs) eta .I. del Stormwater Quality Calculations Water Quality Map VDEQ RRM Spreadsheets Post-Development RRM HydroCAD Analysis IN la IN '''‘, \ ‘. s, I \ .\ .‘,////\ \ ---.-.____ •\\ V.,,,- \ C\ • • .s."\-,,,,•,..-- \-.\.....„\,7,7F,i,„;\‘‘..\.,, 1.-. i i v ` V vv•.vim-vv�, - It_ \\'/\„\\\,. \.,A,N. -,..,...zz-z-_,..__:„.....-z= -------- --.-,- ., N. - - \N ____,: , _ ,..., :.;:_-:-...„-„:::::::,,,,,,,,,,,,_ 1, - -,\I p-- ..•,,,„,.. - -..._ .*, - --,_,-..,-_ --___-_. , No -"--- -s‘s tts0/1\Y! 4,-::t1::1-71:\ \. 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Lam`- /T/+� - II 111 \\\1\1., \Illi\ t: .\\ :1::\\\•\s, •it;\ :• ________________________ :,... 1,, ::\ 'Ico 1 ■■ •o:III I 1 U ,0 a o o -ri _ _ n O • II Q —' y 1 ' ! �— eD �� rf —• r-'F 1 1 `V 0 0 -1 CD < CD o _• — — 1,-/. _ U r+ _ _ O O Q cn iiii'o o cn -+, n cn n c Q n D •• • mo- r0 CD u) (n CO 55D- o O Virginia Runoff Reduction Method New Development Worksheet-v2.8-June 2014 To be used w/2011 BMP Standards and Specifications Site Data Project Name: Free State Run Date: data input cells _ calculation cells constant values 1.Post-Development Project&Land Cover Information Constants art Annual Rainfall(inches) Target Rainfall Event(inches) 1.00 Phosphorus EMC(mg/L) 0.26 Nitrogen EMC(mg/L) 1.86 Target Phosphorus Target Load(lb/acre/yr) 0.41 Pj 0.90 Land Cover (acres) A soils B Soils C Soils D Soils Totals Forest/Open Space(acres)-undisturbed, protected forest/open space or reforested land .ft 0.04 0.5 Mir0.0 0.56 Managed Turf(acres)-disturbed,graded for yards or other turf to be mowed/managed + r 0 0.97 2.59 0.00 3.56 Impervious Cover(aces) r 0.61 2.34 0.00 2.95 Total 7.07 Rv Coefficients A soils B Soils C Soils D Soils Forest/Open Space 0.02 0.03 0.04 0.05 Managed Turf 0.15 0.20 0.22 0.25 Impervious Cover 0.95 0.95 0.95 0.95 Land Cover Summary Forest/Open Space Cover(acres) 0.56 Weighted Rv(forest) 0.04 %Forest 8% Managed Turf Cover(acres) 3.56 Weighted Rv(turf) 0.21 %Managed Turf 50% Impervious Cover(acres) 2.95 Rv(impervious) 0.95 %Impervious 42% Total Site Area(acres) 7.07 Site Rv 0.51 Post-Development Treatment Volumeacre-ft) 0.30 Post-Development Treatment Volume(cubic - feet) 13,026 _ Post_Development Load(TP)(Ib/yr) 8.18 Post Development Load(TN)(lb/yr) 58.55 Total Load(TP)Reduction Required(Ib/yr) 5.29 a Virginia Runoff Reduction Method Worksheet 97- Virginia Runoff Reduction Method New Development Worksheet-v2.8-June 2014 .r Site Data Summary Total Rainfall=43 inches Site Land Cover Summary de A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.04 0.52 0.00 0.56 7.92 Turf(acres) 0.00 0.97 2.59 0.00 3.56 50.35 Impervious(acres) 0.00 0.61 2.34 0.00 2.95 41.73 7.07 100.00 Site Rv 0.51 Post Development Treatment Volume(ft3) 13026 Post Development TP Load(Ib/yr) 8.18 Post Development TN Load(Ib/yr) 58.55 Total TP Load Reduction Required(Ib/yr) 5.29 Total Runoff Volume Reduction(ft') 437 Total TP Load Reduction Achieved(Ib/yr) 0 Total TN Load Reduction Achieved(lb/yr) 4.91 Adjusted Post Development TP Load(lb/yr) 7.81 Remaining Phosphorous Load Reduction(Lb/yr)Required 4.91 Drainage Area Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.41 0.00 0.00 0.00 0.00 0.41 Impervious(acres) 0.23 0.00 0.00 0.00 0.00 0.23 0.64 IIDrainage Area Compliance Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total TP Load Red.(Ib/yr) 0.38 0.00 0.00 0.00 0.00 0.38 I TN Load Red.(Ib/yr) 4.91 0.00 0.00 0.00 0.00 4.91 I I Ili I I I I I Summary Print Site Results D.A.A D.A.B D.A.C D.A.D D.A.E AREA CHECK IMPERVIOUS COVER 023 0.00 000 0.00- 0.00 OK. IMPERVIOUS COVER TREATED 0.23 0.00 0.00 0.00 0.00 OK. TURF AREA 0.41 000 0.00 0.00 0.00 OK. TURF AREA TREATED 0.11 0.00 0.00 0.00 0.00 OK. AREA CHECK OK. OK, OK. OK. OR. Phosphorus TOTAL TREATMENT VOLUME(of) 13,020 TOTAL PHOSPHORUS LOAD REDUCTION REQUIRED(LB/YEAR) 0,201 RUNOFF REDUCTION(cf) 437 PHOSPHORUS LOAD REDUCTION ACHIEVED(LB/YR) 0.30 ADJUSTED POST-DEVELOPMENT PHOSPHORUS LOAD(TP)(Ib/yr) 7.01 REMAINING PHOSPHORUS LOAD REDUCTION(LB/YR)NEEDED 4.91 _Nitrogen(for_information purposes) TOTAL TREATMENT VOLUME(chi 13.020 RUNOFF REDUCTION(of) 437 NITROGEN LOAD REDUCTOR ACHIEVED(LB/YR) 4.91 ADJUSTED POST-DEVELOPMENT NITROGEN LOAD(TN)(lb/yr) 03.041 ana a a a a a a AIM AIM a a -IM =13== - 11. .111= -- 11.111.1111.1 iTiTEMMEnarriC ], . - wIlT7tS'= 000 '"000 n" ElMil -_-- Mena 020 - =_ - --- MINI O' --- tDeveio•mentLoad mDrama••Ann A��^ o,, � --�� U bee. Unit Dawn.bon dera.a =Pra tk:M �n�.m..9 R!�rPra.Roes�b. Fa.an.�ba. �mw.da Wrea PA Load to Pa d•w" eked Roof illiMMIM sues m.een molMINIMM , see rod soxrnmon ®MilliMMMEM o _ 0 � 0 M 2 Rooftop 0isconn,non Y a 5 mPenecoo le lSpa 5.rena,e un 0 050MAI 0 -- 0 1: 2b Oa6mrwNn SOY(Spec. mous acres tlaconnated MilM� MN ll.+ INallin .... ... red5.unof.t.cred or treated vMIIIIIMMM oPIMlume ea 0 MINIM 000 000 1/1111/11 ]m Ory Wel01 Fm et SOx mn..tad a •W 0 0 0 © 0.00 0.00 00 0.00 08 m mow acres disconnect. M c �Mbm- mnmwwme ^ - c - nmrtmmd u®on la treabad wee �Mil 0 0 0 © 000 000 000 0.0021 To Ra n Garden 01 S X9 1( em NMI ��M M 000 IM MM 50 ��- 4•11. NIIIIMMIIIIIMOMII ____ 3.Permeable Pavement acres of i 3a aomaao-e aaVememv�.lSps a]) .miR.ious•yapaaaen0 a5%mm. mn��lume ® ��®��® Parma Pavement 03(Spc A]) Minnil ]5%mndiwuma -..- apo-® 0.. �- .�:��. � b,d no w nn a res 4 a n ng to grass MN a b o.aaann.cjp s.asr.a.a1 EIRMS111X=1 010 1111MMEMII® M a c Grass Channd,In compost amended=Mg= 30xe•. . me 030 IMIIIMMEMIIPIIIMIERIIIIIPIIMIRE Soils.ep.was W.sponaa) wxmnm.mium. 03o aro ��M® - rec,o,on 11=M1111111.1..11= 11= 1 IMMINIMM aft 5 0 i 5 v• sa Dry Swale el(Spec Ip) re d ern 9 ' lurr a m 11....111Mza EIMIMIIIIHIMI 0.00 a a 11.1 � pm 5 b.cry seie v2(Spe##10) "'rerw vow webaini9 5o'au i�me ct or 0W illiM�w 00 40 IIIMIIMPIO 0.00 N 0%mn n loos 0 W W M 0 MEM 40 000 __=_M 6 Bioi�t�nnon s 01 or Urban .bm s u m a 040 0 ®MI® 0.00 0.50 0.11 02 (8P.89) turf n - ProreWntoon p,3333, 040 0 120 180 © 000 019 010 008 rI/P0,005 acres dr.n MIb6petnbn.2(Spec 0) w6 acnas n^,�'�e apx c,w�ma �bwretenton ., MINE-- . � •m w 0... 0.a. 000 0.00 MI Virginia Runoff Reduction Method Worksheet AM Drainage Area A Summary um Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 BIB Turf(acres) 0.00 0.37 0.04 0.00 0.41 64.06 Impervious(acres) 0.00. 0.18 0.05 0.00 0.23 35.94 0.64 BMP Selections Practice Credit Area(acres) Downstream Practice 6.b.Bioretention 82(Spec a9) Impervious: 1.11 Turf(Pervious): 1.35 IYt Total Impervious Cover Treated(acres) 0.23 Total Turf Area Treated(acres) 0.41 Total TP Load Reduction Achieved In D.A.A(Ib/yr) 0.38 Total TN Load Reduction Achieved In D.A.A(Ib/yr) 4.91 BM MB Summary Print IID Virginia Runoff Reduction Method Worksheet Channel and Flood Protection it Weighted CN 1-year 2-year storm 10-year storm Adjusted CN storm Adjusted Adjusted CN CN Target Rainfall Event(in) 3.02 3.66 5.57 D.A.A CN 75 71 72 73 D.A.BCN 0 #N/A #N/A #N/A D.A.C CN 0 #N/A #N/A #N/A D.A.D CN 0 #N/A #N/A #N/A illa D.A.E CN 0 #N/A #N/A #N/A 111111 ri it MR NM MI Summary Print `r. Mil wr ar < #3 > BioFilter Drainage 111 Bypass ar CUbCat) Reach 'on Drainage Diagram for Free State Run(RRM) Prepared by Shimp Engineering P.C., Printed 11/18/2015 r HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC rr Free State Run(RRM) Type/l 24-hr 1 year storm Rainfall=3.02" .r Prepared by Shimp Engineering P.C. Printed 11/18/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment#3: BioFilter Drainage Runoff = 1.00 cfs @ 11.90 hrs, Volume= 0.041 af, Depth> 0.77" �.. Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 1 year storm Rainfall=3.02" Area(ac) CN Description " 0.640 71 0.640 100.00% Pervious Area elm Summary for Subcatchment X: Bypass Runoff = 18.51 cfs @ 11.89 hrs, Volume= 0.750 af, Depth> 1.39" "l Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 1 year storm Rainfall=3.02" ., Area(ac) CN Description 2.040 98 Unconnected pavement, HSG C 0.420 98 Unconnected pavement, HSG B 0.510 70 Woods, Good, HSG C 'si 0.600 61 >75%Grass cover, Good, HSG B 2.880 74 >75%Grass cover, Good, HSG C 6.450 82 Weighted Average - 3.990 61.86% Pervious Area 2.460 38.14% Impervious Area 2.460 100.00% Unconnected rr rr AIM rr irr err rw r■ Free State Run(RRM) Type 1124-hr 10 year storm Rainfall=5.57" +�+ Prepared by Shimp Engineering P.C. Printed 11/18/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Paae 3 Summary for Subcatchment#3: BioFilter Drainage 2. Runoff = 3.37 cfs @ 11.89 hrs, Volume= 0.136 af, Depth> 2.56" •• Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" Area(ac) CN Description ` * 0.640 71 0.640 100.00% Pervious Area Summary for Subcatchment X: Bypass Runoff = 45.86 cfs @ 11.89 hrs, Volume= 1.932 af, Depth> 3.59" tea Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" r. Area(ac) CN Description 2.040 98 Unconnected pavement, HSG C 0.420 98 Unconnected pavement, HSG B 0.510 70 Woods, Good, HSG C - 0.600 61 >75%Grass cover, Good, HSG B 2.880 74 >75%Grass cover, Good, HSG C 6.450 82 Weighted Average NM 3.990 61.86% Pervious Area 2.460 38.14% Impervious Area 2.460 100.00% Unconnected irr MIN g ■r OM rr Storm Inlet Calculations O Drainage Inlet Map VDOT LD-229 Storm Drain Design Computations ,■ VDOT LD-204 Stormwater Inlet Computations VDOT LD-347 HGL Computations - -------':',.. ----\1111111............/„.....m, ,. '11.11.1."-lit CO-0 * riN-1 CT CO 0 CD QQ O • 1,,\\.' ? ø•\. \ ',$*" 0_ ?c) * a_ 0 ' v • '‘ -7 O U) O O -7 / O n / \ \N., j ,` ` •1 1.' \ ' . / ' �7.,-,_,_,-,-'-'- -_ \ ► .� V , ...... ---___, \\• N _.-...-,-- I II 4 ;:,\ '�/ I' / '- A,•\ V 4414114/ S- --..-,,,i \ / k.'"•) --......N:• ^C \V '' , ..... 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N Cl W W A N la LC, VD U7 NJ U1 LD Ut N W Cl O O V Cl N N N I-.-• V N N IV V — 01 CO Cl NJ V V U1 W W (p Culvert Calculations Belvedere HydroCAD Analysis Culvert Analysis VDOT 8C-1 Inlet Control OS Ala w sus ow r Belveder Drainage A ea 1P For bay 2P Fac lity 4 To Free State Culvert KSubcat) Reach -on. Drainage Diagram for BELVEDERE-POST r Prepared by Shimp Engineering P.C., Printed 11/9/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC it rr BELVEDERE-POST Type 1124-hr 1 year storm Rainfall=3.02" tea Prepared by Shimp Engineering P.C. Printed 11/9/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Paae 2 �• Summary for Pond 1 P: Forebay Inflow Area= 14.300 ac, 0.00% Impervious, Inflow Depth > 1.91" for 1 year storm event Inflow = 35.65 cfs© 12.06 hrs, Volume= 2.278 af Outflow = 35.10 cfs© 12.08 hrs, Volume= 2.090 af, Atten=2%, Lag= 1.3 min Primary = 35.10 cfs @ 12.08 hrs, Volume= 2.090 of . Routing by Stor-Ind method,Time Span=0.00-24.00 hrs, dt=0.05 hrs Peak Elev=443.40'@ 12.08 hrs Surf.Area= 3,961 sf Storage= 11,356 cf Plug-Flow detention time=62.7 min calculated for 2.090 af (92%of inflow) WM Center-of-Mass det. time= 19.8 min (836.0-816.2) Volume Invert Avail.Storage Storage Description #1 438.00' 38,068 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) +� 438.00 497 0 0 440.00 1,560 2,057 2,057 442.00 2,921 4,481 6,538 444.00 4,406 7,327 13,865 446.00 6,019 10,425 24,290 448.00 7,759 13,778 38,068 Device Routing Invert Outlet Devices #1 Primary 436.00' 36.0" Round Culvert L=55.0' Ke=0.400 Inlet/Outlet Invert=436.00'/428.00' S= 0.1455'/' Cc=0.900 n=0.010 Concrete pipe, straight&clean #2 Device 1 442.50' 48.0"Horiz. Riser C=0.600 Limited to weir flow at low heads Primary OutFlow Max=34.46 cfs© 12.08 hrs HW=443.39' (Free Discharge) tlCulvert (Passes 34.46 cfs of 88.49 cfs potential flow) gri 2=Riser (Weir Controls 34.46 cfs @ 3.08 fps) Summary for Subcatchment 1S: Belvedere Drainage Area r Runoff = 35.65 cfs @ 12.06 hrs, Volume= 2.278 af, Depth> 1.91" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 1 year storm Rainfall=3.02" Area(ac) CN Description * 14.300 89 from sheet c20 Belvedere plans 14.300 100.00% Pervious Area Tc Length Slope Velocity Capacity Description i' (min) (feet) (ft/ft) (ft/sec) (cfs) 14.4 Direct Entry,total rr r BELVEDERE-POST Type 1124-hr 1 year storm Rainfall=3.02" "" Prepared by Shimp Engineering P.C. Printed 11/9/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 3 or Summary for Link 2L: To Free State Culvert Inflow Area= 14.300 ac, 0.00% Impervious, Inflow Depth > 1.69" for 1 year storm event Inflow = 8.90 cfs @ 12.39 hrs, Volume= 2.013 af "r Primary = 8.90 cfs @ 12.39 hrs, Volume= 2.013 af, Atten=0%, Lag=0.0 min Primary outflow= Inflow, Time Span=0.00-24.00 hrs, dt=0.05 hrs NB Summary for Pond 2P: Facility 4 Inflow Area= 14.300 ac, 0.00% Impervious, Inflow Depth> 1.75" for 1 year storm event ""' Inflow = 35.10 cfs @ 12.08 hrs, Volume= 2.090 af Outflow = 8.90 cfs @ 12.39 hrs, Volume= 2.013 af, Atten=75%, Lag= 18.2 min Primary = 8.90 cfs @ 12.39 hrs, Volume= 2.013 iiir Routing by Stor-Ind method, Time Span=0.00-24.00 hrs, dt=0.05 hrs Peak Elev=430.65'@ 12.39 hrs Surf.Area= 13,492 sf Storage=34,870 cf Ns Plug-Flow detention time= 66.1 min calculated for 2.008 of (96%of inflow) Center-of-Mass det. time=45.3 min (881.3 -836.0) Volume Invert Avail.Storage Storage Description 1111 #1 427.75' 122,971 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store -., (feet) (sq-ft) (cubic-feet) (cubic-feet) 427.75 10,646 0 0 428.00 10,869 2,689 2,689 430.00 12,813 23,682 26,371 la 432.00 14,916 27,729 54,100 434.00 17,178 32,094 86,194 436.00 19,599 36,777 122,971 we Device Routing Invert Outlet Devices #1 Primary 419.84' 36.0" Round Culvert L=63.2' Ke=0.400 Inlet/Outlet Invert=419.84'/418.00' S= 0.0291 '/' Cc=0.900 OM n=0.010 #2 Device 1 427.75' 15.0"Vert.Orifice/Grate C=0.600 #3 Device 1 434.00' 48.0"Horiz. Riser C=0.600 Limited to weir flow at low heads "r primary OutFlow Max=8.90 cfs @ 12.39 hrs HW=430.64' (Free Discharge) T"-- =Culvert (Passes 8.90 cfs of 111.23 cfs potential flow) 2=Orifice/Grate (Orifice Controls 8.90 cfs @ 7.25 fps) am 3=Riser ( Controls 0.00 cfs) r■ r BELVEDERE-POST Type 1124-hr 10 year storm Rainfall=5.57" Prepared by Shimp Engineering P.C. Printed 11/9/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 4 Summary for Pond 1 P: Forebay Inflow Area= 14.300 ac, 0.00% Impervious, Inflow Depth > 4.31" for 10 year storm event Inflow = 77.63 cfs @ 12.06 hrs, Volume= 5.134 of Outflow = 75.98 cfs @ 12.08 hrs, Volume= 4.943 af, Atten=2%, Lag= 1.2 min Primary = 75.98 cfs @ 12.08 hrs, Volume= 4.943 of r„r Routing by Stor-Ind method, Time Span=0.00-24.00 hrs,dt=0.05 hrs Peak Elev=444.05'@ 12.08 hrs Surf.Area=4,446 sf Storage= 14,084 cf Plug-Flow detention time=36.6 min calculated for 4.943 af (96%of inflow) .� Center-of-Mass det. time= 14.9 min (808.3 - 793.5) Volume Invert Avail.Storage Storage Description #1 438.00' 38,068 cf Custom Stage Data(Prismatic) Listed below(Recalc) ilia Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 438.00 497 0 0 440.00 1,560 2,057 2,057 442.00 2,921 4,481 6,538 444.00 4,406 7,327 13,865 00 446.00 6,019 10,425 24,290 448.00 7,759 13,778 38,068 Device Routing Invert Outlet Devices Ira #1 Primary 436.00' 36.0" Round Culvert L=55.0' Ke=0.400 Inlet/Outlet Invert=436.00'/428.00' S=0.1455'1 Cc=0.900 n=0.010 Concrete pipe, straight&clean #2 Device 1 442.50' 48.0"Horiz. Riser C=0.600 Limited to weir flow at low heads primary OutFlow Max=74.71 cfs @ 12.08 hrs HW=444.02' (Free Discharge) t1Culvert (Passes 74.71 cfs of 93.15 cfs potential flow) 2=Riser (Orifice Controls 74.71 cfs @ 5.95 fps) Summary for Subcatchment 1S: Belvedere Drainage Area gas Runoff = 77.63 cfs @ 12.06 hrs, Volume= 5.134 af, Depth> 4.31" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs,dt=0.05 hrs Type II 24-hr 10 year storm Rainfall=5.57" Area(ac) CN Description ,,, 14.300 89 from sheet c20 Belvedere plans 14.300 100.00% Pervious Area Tc Length Slope Velocity Capacity Description "" (min) (feet) (ft/ft) (ft/sec) (cfs) 14.4 Direct Entry,total rr o r r BELVEDERE-POST Type 1124-hr 10 year storm Rainfall=5.57" .. Prepared by Shimp Engineering P.C. Printed 11/9/2015 HydroCAD?9.10 s/n 07054 ?2011 HydroCAD Software Solutions LLC Page 5 Summary for Link 2L: To Free State Culvert Inflow Area= 14.300 ac, 0.00% Impervious, Inflow Depth > 4.05" for 10 year storm event Inflow = 16.93 cfs @ 12.41 hrs, Volume= 4.832 af ,. Primary = 16.93 cfs @ 12.41 hrs, Volume= 4.832 af, Atten=0%, Lag=0.0 min Primary outflow= Inflow, Time Span=0.00-24.00 hrs, dt=0.05 hrs Summary for Pond 2P: Facility 4 Inflow Area= 14.300 ac, 0.00% Impervious, Inflow Depth > 4.15" for 10 year storm event .. Inflow = 75.98 cfs @ 12.08 hrs, Volume= 4.943 of Outflow = 16.93 cfs @ 12.41 hrs, Volume= 4.832 af, Atten= 78%, Lag= 19.9 min Primary = 16.93 cfs @ 12.41 hrs, Volume= 4.832 af Routing by Stor-Ind method, Time Span=0.00-24.00 hrs, dt=0.05 hrs Peak Elev=434.16'@ 12.41 hrs Surf.Area= 17,373 sf Storage=88,977 cf Plug-Flow detention time= 75.9 min calculated for 4.822 of (98%of inflow) es Center-of-Mass det. time=62.5 min (870.8-808.3) Volume Invert Avail.Storage Storage Description •• #1 427.75' 122,971 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) we 427.75 10,646 0 0 428.00 10,869 2,689 2,689 430.00 12,813 23,682 26,371 - 432.00 14,916 27,729 54,100 434.00 17,178 32,094 86,194 436.00 19,599 36,777 122,971 d Device Routing Invert Outlet Devices #1 Primary 419.84' 36.0" Round Culvert L=63.2' Ke=0.400 Inlet/Outlet Invert=419.84'/418.00' S= 0.0291 '1 Cc=0.900 n=0.010 soi #2 Device 1 427.75' 15.0"Vert.Orifice/Grate C=0.600 #3 Device 1 434.00' 48.0"Horiz. Riser C=0.600 Limited to weir flow at low heads ., primary OutFlow Max=16.80 cfs @ 12.41 hrs HW=434.16' (Free Discharge) Culvert (Passes 16.80 cfs of 130.56 cfs potential flow) 2=Orifice/Grate (Orifice Controls 14.21 cfs @ 11.58 fps) 3=Riser (Weir Controls 2.59 cfs @ 1.30 fps) OM 110 YIN MI w. Culvert Analysis Culvert Drainage Area 14.3 Ac Slope 5.8 % .. Flow 18.1 cfs Depth 0.669 ft Area of Flow 1.057 sq ft Wetted Perimeter 2.72 ft Hydraulic Radius 0.389 ft Average Velocity 17.028 fps Top Width(T) 2.214 ft Froude Number 4.343 Critical Depth 1.437 ft Critical Velocity 6.165 fps Critical Slope 0.00349 ft/ft Critical Top Width 2.472 ft Max Shear Stress 2.339 Ib/ft^2 Avg Shear Stress 1.358 Ib/ft^2 rr rr Appendix 8C-1 Inlet Control, Circular Concrete -150 _,0,000 CHART '10 -• 155 -5,000 EXAMPLE (I) (2) (3) -15$ _5,000 Mew -i. 0.1;0 H. -s• -144 ;-5.000 '-5. - -4,000 Jr --5 -5. -132 I.n .. 3,000 Iq !.S 6.9 -5. 4. -120 _4. • r•2,000 ane. 7.4 - -I0$ 171 11.! 7.7 -- 4. - -3. oil _ .0 Is/set =..E. -96 .-.-3. - - 500 " ---..,:-.--of - w -7! -400 k.-- -!. - - Ai -300 %i� -1.5 -1.5 M N - - _ `d0 t -!00 r -1.5 /W -100 - 34* u -so t . -1.0 _1.0 -40 SCALP ENTRANCE IC a -1.0 - or ' W W -.5 $. -35 -3o to were 44118 a. 1- - -.f W Mohan _• i -33 ---t- a - to IS) pees W .-.s0 1444.411 2 -.5 -.5 01 M4«4 •5 «1 -2? MN"nq - - t0 . -24 --5 -.7 7�-T ow _$ te use sel04 t)4.41)enlist . !1 -5 bdM ! ..H s. al7 . .01,11w - 4 R..nigN I..M..411..IMM. 0«40..H..,1111111..« am -I5 :- 3 lo•n/m4. -.5 -.• -.6 -2 . -15 - 5 -.5 (.0 -.5 -It HEADWATER DEPTH FOR IN NEAOWATEl1 SCALES 263 CONCRETE PIPE CULVERTS 01/4114.1 4..1�.��.ow..AM».1 QEvIs[0 MAY NW WITH INLET CONTROL in 1. r1. Sediment Basin Temporary Sediment Basin Design Data Worksheets vieas air ria r. r. rr TEMPORARY SEDIMENT BASIN DESIGN DATA SHEET (with or without an emergency spillway) Project Free State Run rr Basin#1 Location: NW corner Total area draining to basin: 3.52 acres Basin Volume Design Wet Storage: 1. Minimum required volume=67 cu.yds.x Total Drainage Area(acres). IS 67 cu.yds.x 3.52 acres= 236 cu.yds. 2. Available basin volume= 236 cu.yds. at elevation 407.25 (From storage-elevation curve) w. 3. Excavate cu.yds.to obtain required volume*. *Elevation corresponding to required volume=invert of the dewatering orifice. Jim 4. Available volume before cleanout required. 33 cu.yds.x 3.52 acres= 116 cu.yds. 5. Elevation corresponding to cleanout level= 406.3 (From Storage Elevation Curve) 6. Distance from invert of the dewatering orifice to cleanout level= 1.0 ft (Min. = 1.0 ft.) Dry Storage: 7. Minimum required volume=67 cu.yds.x Total Drainage Area(acres). 67 cu.yds.x _ 3.52 acres= 236 cu.yds. 8. Total available basin volume at crest of riser* = 236 cu.yds.at r. elevation 409.0 (From Storage-Elevation Curve) * Minimum= 101 cu.yds./acre of total drainage area. 9. Diameter of dewatering orifice= 4 in. 10. Diameter of flexible tubing= 6 in.(diameter of dewatering orifice plus 2 inches). w Preliminary Design Elevations 11. Crest of Riser = 405.0 Top of Dam = 412.0 Design High Water = 411.0 ,,. Upstream Toe of Dam = 405.0 Basin Shape 12. Length of Flow L = Effective Width We 0.2 If>2,baffles are not required r. If<2,baffles are required Runoff r. 13. Q2 = 7.6 cfs (From Chapter 5) 14. Q25 = 11.6 cfs (From Chapter 5) Principal Spillway Design 15. With emergency spillway,required spillway capacity Qp=Q2= 7.6 (riser and barrel) "O Without emergency spillway,required spillway capacity Qp= Q25= 11.6 (riser and barrel) 16. With emergency spillway: ems Assumed available head(h)= 2 ft. (Using Q2) h=Crest of Emergency Spillway Elevation-Crest of Riser Elevation r. Without emergency spillway: Assumed available head(h)= 1 ft. (Using Q25) h=Design High Water Elevation-Crest of Riser Elevation 17. Riser Diameter(Dr)= 24 in. Actual head(h)= 0.6 ft (From Plate 3.14-8.) Note: Avoid orifice flow conditions. 18. Barrel length(1)= 38.0 ft. Head(H)on barrel through embankment= 6.0 ft. (From Plate 3.14-7). 19. Barrel diameter= 18 in. (From Plate 3.14-B [concrete pipe] or Plate 3.14-A [corrugated pipe]). r. 20. Trash rack and anti-vortex device Diameter= 36 inches Height= 13 inches (From Table 3.14-D). Emergency Spillway Design 21. Required spillway capacity Qe=Q25-Qp= 0.0 cfs 22. Bottom width(b)= - ft.;the slope of the exit channel(s)= - ft./foot;and the minimum length of the exit channel(x) = �.+ - ft. (From Table 3.14-C). ,., Anti-Seep Collar Design 23. Depth of water at principal spillway crest(Y) = 4.0 ft Slope of upstream face of embankment(Z) = 2.0:1 .. Slope of principal spillway barrel(Sb) = 2.6% Length of barrel in saturated zone(La) = 15 ft 24. Number of collars required= 1 dimensions= 4x4 (from Plate 3.14-12). Final Design Elevations 25. Top of Dam = 412.0 Design High Water = 410.0 Emergency Spillway Crest = 410.0 Principal Spillway Crest = 409.0 Dewatering Orifice Invert = 407.3 Cleanout Elevation = 406.3 r• Elevation of Upstream Toe of Dam or Excavated Bottom of"Wet Storage Area" (if excavation was performed)= 405.0 rr rr it TEMPORARY SEDIMENT BASIN DESIGN DATA SHEET (with or without an emergency spillway) Project Free State Run Basin#2 Location: SE corner Total area draining to basin: 3.73 acres Basin Volume Design Wet Storage: 1. Minimum required volume=67 cu.yds. x Total Drainage Area(acres). 67 cu.yds.x 3.73 acres= 250 cu.yds. 2. Available basin volume= 236 cu.yds. at elevation 402.25 (From storage-elevation curve) 3. Excavate cu.yds.to obtain required volume*. *Elevation corresponding to required volume=invert of the dewatering orifice. Jos 4. Available volume before cleanout required. 33 cu.yds.x 3.73 acres= 123 cu.yds. a 5. Elevation corresponding to cleanout level= 400.5 (From Storage-Elevation Curve) 6. Distance from invert of the dewatering orifice to cleanout level= 1.8 ft (Min.= 1.0 ft.) Dry Storage: 7. Minimum required volume=67 cu.yds.x Total Drainage Area(acres). 67 cu.yds.x 3.73 acres= 250 cu.yds. 8. Total available basin volume at crest of riser* = 304 cu.yds. at elevation 405.0 (From Storage-Elevation Curve) ma * Minimum= 101 cu.yds./acre of total drainage area. 9. Diameter of dewatering orifice= 4 in. rr. 10. Diameter of flexible tubing= 6 in.(diameter of dewatering orifice plus 2 inches). Mit Preliminary Design Elevations 11. Crest of Riser = 399.5 Top of Dam = 407.5 Design High Water = 406.5 ,,. Upstream Toe of Dam = 398.0 Basin Shape 12. Length of Flow L = Effective Width We 1.0 If>2,baffles are not required rr If<2,baffles are required Runoff 13. Q2 = 8.0 cfs (From Chapter 5) 14. Q25 = 12.3 cfs (From Chapter 5) Principal Spillway Design 15. With emergency spillway,required spillway capacity Qp=Q2= 8.0 (riser and barrel) " Without emergency spillway,required spillway capacity Qp=Q25= 12.3 (riser and barrel) 16. With emergency spillway: Assumed available head(h)= 1.5 ft. (Using Q2) h=Crest of Emergency Spillway Elevation-Crest of Riser Elevation rr Without emergency spillway: Assumed available head(h)= 0.5 ft. (Using Q25) h=Design High Water Elevation-Crest of Riser Elevation 17. Riser Diameter(Dr)= 48 in. Actual head(h)= 0.5 ft (From Plate 3.14-8.) Note: Avoid orifice flow conditions. 18. Barrel length(1)= 48.5 ft. Head(H)on barrel through embankment= 10.0 ft. (From Plate 3.14-7). 19. Barrel diameter= 15 in. (From Plate 3.14-B [concrete pipe] or Plate 3.14-A [corrugated pipe]). ,r 20. Trash rack and anti-vortex device Diameter= 72 inches Height= 21 inches rr (From Table 3.14-D). r. w Emergency Spillway Design 21. Required spillway capacity Qe=Q25-Qp= 0.0 cfs 22. Bottom width(b)= 6 ft.;the slope of the exit channel(s)= 3.9 ft./foot;and the minimum length of the exit channel(x) _ r 32 ft. (From Table 3.14-C). ,., Anti-Seep Collar Design 23. Depth of water at principal spillway crest(Y) = 7.0 ft Slope of upstream face of embankment(Z) = 2.0:1 rr Slope of principal spillway barrel(Sb) = 7.2% Length of barrel in saturated zone(La) = 36 ft 24. Number of collars required= 2 dimensions= 4x4 (from Plate 3.14-12). Final Design Elevations 25. Top of Dam = 407.5 Design High Water = 406.5 Emergency Spillway Crest = 406.0 +�• Principal Spillway Crest = 405.0 Dewatering Orifice Invert = 402.3 Cleanout Elevation = 400.5 - Elevation of Upstream Toe of Dam or Excavated Bottom of"Wet Storage Area" (if excavation was performed)= 398.0 OE a w rn lal Independent Reports Excerpt from NRCS Soils Report NOAA Precipitation Report Eli lin .r. Y. USDA United States A product of the National Custom Soil Resource %' Department of Cooperative Soil Survey, Agriculture a joint effort of the United Report for NRCSStates Department of Agriculture and other q b e m a r l e Federal agencies, State Natural agencies including the Conserves Agricultural Experiment County, Vi rg i n i a Conservation Stations, and local '.. Service participants y. 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"= _ ," ' . , ' a ..,:f. rig .s, } 1 "er t` c ,a° '� 't + .-3,a. `` ?#� Ray "-,� „t ^� 38-4 2 r, x727870 722950 723030 723110 723190 723 :.. 723350 1 m N Map Scale:1:3,140 if prinked on A portrait(8.5"x 11")sheet v N Meters A 0 45 90 180 270 ()map t 150 300 600 900 I Map projection:Web Marakor Corner coordinates:WGSS4 Edge :UTM Zone 17N WCS84 8 I r Custom Soil Resource Report Albemarle County, Virginia 2C—Albemarle fine sandy loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: kb98 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Albemarle and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Albemarle Setting Landform: Hillslopes Landform position(two-dimensional): Summit +. Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across-slope shape: Convex Parent material: Residuum weathered from metasedimentary rock Typical profile H1 -0 to 5 inches: fine sandy loam H2-5 to 30 inches: clay loam H3-30 to 38 inches: sandy loam H4-38 to 50 inches: bedrock H5-50 to 79 inches: bedrock Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: 35 to 60 inches to paralithic bedrock;40 to 60 inches to lithic bedrock Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water(Ksat): Moderately high (0.20 to 0.57 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None sr Available water storage in profile: Low(about 5.9 inches) Interpretive groups Land capability classification(irrigated): None specified Land capability classification(nonirrigated): 3e Hydrologic Soil Group: C rr r. 12 .yr Custom Soil Resource Report 21B—Culpeper fine sandy loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: kb8k Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: All areas are prime farmland Map Unit Composition Culpeper and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. ire Description of Culpeper Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position(three-dimensional): Interfluve Down-slope shape: Convex rim Across-slope shape: Convex Parent material: Residuum weathered from meta-arkosic sandstone and quartzite Typical profile H1 -0 to 8 inches: fine sandy loam H2-8 to 30 inches: clay H3-30 to 37 inches: sandy clay loam H4-37 to 45 inches: fine sandy loam H5-45 to 50 inches: bedrock H6-50 to 79 inches: bedrock r. Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: 40 to 79 inches to lithic bedrock; 40 to 79 inches to paralithic bedrock Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water(Ksat): Very low to high (0.00 ,., to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None - Available water storage in profile: Moderate(about 6.6 inches) Interpretive groups Land capability classification(irrigated): None specified Land capability classification(nonirrigated): 2e Hydrologic Soil Group: B 13 p Custom Soil Resource Report INN NIN 39D—Hazel loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: kbb3 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Hazel and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Hazel Setting Landform: Hillslopes Landform position(two-dimensional): Summit Landform position(three-dimensional): Interfluve Down-slope shape: Convex NM Across-slope shape: Convex Parent material: Residuum weathered from graywacke sandstone and mica schist Typical profile ` H1 -0 to 10 inches: loam H2- 10 to 20 inches: loam H3-20 to 30 inches: channery loam H4-30 to 79 inches: bedrock Properties and qualities Slope: 15 to 25 percent am Depth to restrictive feature: 20 to 40 inches to lithic bedrock Natural drainage class: Excessively drained Runoff class: Medium Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.20 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low(about 4.1 inches) Interpretive groups Land capability classification(irrigated): None specified Land capability classification(nonirrigated): 4e Hydrologic Soil Group: B 14 rrr dm 2/5/2015 Precipitation Frequency Data Server NOAA Atlas 14,Volume 2,Version 3 �" Location name:Charlottesville,Virginia, US* um N = Latitude:38.0700°, Longitude:-78.4574° Elevation:412 ft* • source:Google Maps °'4,,,.., POINT PRECIPITATION FREQUENCY ESTIMATES as G.M.Bonnin,D.Marlin,B.Lin,T.Parzybok,M.Yekta,and D.Riley NOAA,National Weather Service,Silver Spring,Maryland e„ PF tabular I PF araohica(I Maps & aerials PF tabular MI PDS-based point precipitation frequency estimates with 90%confidence intervals (in inches)1 Duration Average recurrence interval(years) 1 2 5 10 25 50 100 200 500 1000 rr 0.352 0.420 0.493 0.554 0.624 0.679 0.729 0.778 0.836 0.883 5-min (0.318-0.391) (0.379-0.466) (0.444-0.546) (0.498-0.613) (0.558-0.688) (0.604-0.748) (0.646-0.804) (0.684-0.857) (0.728-0.924) (0.762-0.980) 10-min0.563 0.672 0.789 0.886 0.995 1.08 1.16 1.23 1.32 1.39 (0.508-0.625) (0.606-0.746) (0.711-0.874) (0.796-0.980) (0.890-1.10) (0.962-1.19) (1.03-1.28) (1.08-1.36) (1.15-1.46) (1.20-1.54) ow 0.704 0.845 0.999 1.12 1.26 1.37 1.47 1.56 1.67 1.75 15-min (0.635-0.782) (0.762-0.938) (0.899-1.11) (1.01-1.24) (1.13-1.39) (1.22-1.51) (1.30-1.61) (1.37-1.71) (1.45-1.84) (1.51-1.94) 30-min0.965 1.17 1.42 1.62 1.87 2.06 2.24 2.42 2.65 2.83 (0.870-1.07) (1.05-1.29) (1.28-1.57) (1.46-1.80) (1.67-2.06) (1.83-2.27) (1.99-2.47) (2.13-2.67) (2.31-2.93) (2.44-3.14) vas 60-min1.20 146 1.82 2.11 2.49 2.79 3.09 3.40 3.80 4.13 (1.08-1.34) (1.32-1.63) (1.64-2.01) (1.90-2.34) (2.22-2.74) (2.49-3.08) (2.74-3.40) (2.99-3.74) (3.31-4.20) (3.56-4.58) 2-hr 1.45 1.76 2.20 2.58 3.08 3.49 3.91 4.36 4.98 5.50 in (1.27-1.65) (1.54-2.00) (1.93-2.50) (2.27-2.92) (2.69-3.48) (3.03-3.95) (3.38-4.42) (3.74-4.92) (422-5.62) (4.61-6.23) 3-hr 1.58 1.92 2.40 2.81 3.36 3.82 4.29 4.78 5A6 6.04 (1.39-1.82) (1.68-2.20) (2.10-2.76) (2.46-3.22) (2.92-3.84) (3.29-4.35) (3.67-4.88) (4.07-5.45) (4.59-6.23) (5.02-6.90) 6-hr 2.02 2.44 3.03 3.56 4.28 4.91 5.57 6.29 7.31 8.20 (1.79-2.29) (2.15-2.76) (2.66-3.43) (3.12-4.03) (3.73-4.84) (4.25-5.54) (4.78-6.28) (5.33-7.09) (6.10-8.25) (6.76-9.27) 12-hr2.53 3.05 3.81 4.51 5.49 6.36 7.30 8.34 9.87 11.2 (2.24-2.90) (2.69-3.50) (3.35-4.36) (3.95-5.14) (4.77-6.24) (5.47-7.22) (6.20-8.28) (6.99-9.44) (8.12-11.2) (9.11-12.8) Ass 24-hr 3.02 3.66 4.67 5.53 6.79 7.88 9.07 10.4 12A 14.1 (2.71-3.40) (3.29-4.11) (4.19-5.25) (4.93-6.19) (6.02-7.58) (6.93-8.77) (7.92-10.1) (8.97-11.5) (10.5-13.7) (11.8-15.6) 2-day3.57 4.32 5.50 6.46 7.87 9.04 10.3 11.7 13.7 15.4 (3.20-3.99) (3.88-4.83) (4.93-6.14) (5.78-721) (6.98-8.75) (7.96-10.0) (9.02-11.5) (10.1-13.0) (11.7-15.3) (13.1-17.3) ma 3.80 4.60 5.85 6.87 8.36 9.60 10.9 12.4 14.5 16.3 3-day (3.45-4.21) (4.18-5.10) (5.30-6.48) (6.21-7.60) (7.50-9.23) (8.56-10.6) (9.69-12.1) (10.9-13.7) (12.6-16.1) (14.0-18.1) 4-day 4.03 4.88 6.20 7.28 8.85 102 11.6 13.1 15.4 17.2 (3.69-4.43) (4.47-5.37) (5.67-6.81) (6.64-7.99) (8.03-9.70) (9.17-11.1) (10.4-12.7) (11.7-14.4) (13.5-16.9) (15.0-19.0) MI 7-day (4.30-5.11) 5.64 7.05 821 9.87 11.3 12.7 14.3 16.6 18.5 (4.30-5.11) (5.18-6.16) (6.46-7.70) (7.51-8.96) (8.98-10.8) (10.2-12.3) (11.4-13.9) (12.8-15.7) (14.6-18.2) (16.2-20.4) 10-day 5.31 6.37 7.87 9.09 10.8 122 13.7 15.3 17.5 19.3 N (4.90-5.75) (5.89-6.90) (7.26-8.52) (8.36-9.83) (9.89-11.7) (11.1-13.2) (12.4-14.8) (13.7-16.5) (15.6-19.0) (17.0-21.0) 20-day 6.97 8.32 10.0 11.4 13.3 14.7 16.2 17.7 19.8 21.4 (6.53-7.47) (7.79-8.91) (9.39-10.8) (10.6-12.2) (12.3-14.2) (13.6-15.7) (14.9-17.3) (16.3-19.0) (18.0-21.3) (19.4-23.1) 8.55 10.1 12.0 13.4 152 16.6 18.0 19.3 21.1 22.4 as 30-day (8.05-9.11) (9.54-10.8) (11.3-12.8) (12.6-14.3) (14.3-16.2) (15.5-17.7) (16.8-19.2) (18.0-20.6) (19.5-22.6) (20.6-24.0) 10.7 12.6 14.7 16.3 18.4 19.9 21.3 22.8 24.6 25.9 45-day (10.1-11.3) (11.9-13.4) (13.9-15.6) (15.4-17.3) (17.3-19.5) (18.7-21.1) (20.0-22.6) (21.2-24.2) (22.8-26.2) (24.0-27.7) r 12.5 14.7 17.0 18.7 20.9 22.5 24.0 25.4 27.3 28.6 60-day (11.9-13.2) (14.0-15.6) (16.1-18.0) (17.7-19.7) (19.7-22.0) (21.2-23.7) (22.6-25.3) (23.9-26.9) (25.5.28.9) (26.6-30.4) 1 Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS). Numbers In parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates(for a GO given duration and average recurrence interval)w9 be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds are not checked against probable maximum precipitation(PMP)estimates and may be higher than currently vac'PMP values. Please refer to NOM Atlas 14 document for more information. Back to TOD w PF graphical httpJ/hdsc.nws.noxa.gov/hdsc/pfds/pfds_printpage.htmlAat=38.07008don=-78.4574&data=depth&units=english&series=pds 1/4 en 2/5/2015 Precipitation Frequency Data Server PDS-based depth-duration-frequency (DDF) curves Latitude: 38.0700°, Longitude: -78.4574° 30 i i i r I I 25 •c 20 - .•. - • - ;erage recurrence o▪- interval (Years) oc 15 _ .. • — 1 • 2 •0 10 - 5 rL — 10 5 - - 26 — 60 _-- _ - — 100 • -- 500 200 c •c_ c_ •c_ _c . >. > >, > �. 5, t >. ry b L v vf0ro v `0v V1 O ul O O N — 1000 a i rn o fV rn Duration 30 25 20 a • v 0c 15 _. ... • • • 1 60 6.a 5 0 1 2 5 10 25 50 100 200 500 1000 Average recurrence interval(years) NOAA Atlas 14,Volume 2.Version 3 Created(GMT):Thu Feb 5 20:00:50 2015 Duration — 5-min — 2-day — 10-min — 3-day 15-min — 4-day - 30-rnrn — 7-day — 60-min — 10-day — 2-hr — 20-day — 3-hr — 30-day — 6-hr — 45-day — 12-hr — 60-day ---- 24-hr http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lot=38.0700&Ion=-78.4574&data=depth&units=english&series=pds 2/4 2/5/2015 Precipitation Frequency Data Server a a ... Back to Top Maps & aerials Small scale terrain {— 1 -Morgantown Hagerstown-- -———--——\- --- cr • 1 " i } '/`. ; 'Ilii `, MARYLANf} l NES rkersbur`g r t r t v t'' ' 1 ' o - Dove -• Germnanto•wr Baltimores o M �4" , ' :° Washington ann:potis !, t o ,;, , t t,Mr` Manassas, • fl E l A w l E T r f .f Woodbridge ✓ Monongahela Ha ri,r,rbI Staff dl • V I R fl 1 NII Natrona!I wrest ,Sa isbury- _- it George Wasrrirglen ;3 1 .} 4,.„._, National r wrest - Richmond Powhatan o ^ �� "=r Roanoke VIRGINIA ` Petersburg Blacksburg t Newport News pton , s., �`r� I lamo °Virginia Rear y. .;.r>" -• I,/ '" Danville Suffolk°Norfolk o J 71'' .,".• ` 50 km Map Report a map error Large scale terrain r''';:,';''V' ' ' ,) „,..:,, :,, :, ,t OC19RInr:: v T_ t' r. �,/tf _... 4 0Gti5c oK '=y ! t� f B,, Ti.. 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Pollution Prevention Plan. 10, A. Plan showing pollution activities and prevention practices lir rr INA re rr . ' 111111111 161•11 elf• i .:.wnx.e.... ». \ -• �L \\\\ . F'=r 'O Z o x x It s f'A i. \ 6� m .•► c 3 o 0 > \ \ �' S H < i)SCIS i)4 i)0 1 ! x f +I! ilip 0 ♦_y o .t :el'J. CO / Ili. • or/ ane 01 g CT 1 / / ...`� _ -1 .4 of 3 N to c -_, �.\� 1 MAl a w W w w W _W _W W W W W W W W m \ _ \ ♦ W O 3 = W w i., w u o 0 0 0 0 0 o Z 0 LL ‘I ` •.` \ `•••. ♦ \ \ tt'� = 1•F _ Ou (T N CO A ID V Vt N W N O 11 `\ y rn .,._.. .v -..7:1:::„2„,.....,;....1,... ` — r O AUCs C Z ; 0 ; - Z A cn n 0 > Z 9............__.`\`,,. -,\`-:::•••,,•-•'--'`-..: � a rm*� cry v v v m y N m D II -`�`�\` `"�s..--`� Noz 0 >0 2 rt x m a . a > Z . Z c c 0 `1• • `♦ •` \ �.. �_—" v m a O f7 u!rr. y M N 0 n A O O m Xi _i ` / \ . `\ � -- -- y z v v o z o o z m I/ �` `N. � ----- - ') -1 z z Z m vi rn a O \ \ `� m „ 6 0 \ \/ ,mow--- �. (,.>. .� _ ,}; : :' ' ® O ® ® OOO ® ®®O®OCD m 1 1 r A\' , .) . 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' I o m 0 �' � I MN( ::: _:-'1Jk. 1 t 1 ®1 I 1 I \ \ I ocnw I I .•.'' �' , / / ,I / / o m / i t i' / �- -� "it % / i,/ .„......:„..<7 0„,„ 1 �. '��y� / / row a � , Ill / / / ,1 / / / / ,. YW / ....,,_ • N Ort> SA) / / ; I' I d oQo 0 co foo • 1 I / / I 1 1( o N3 3 Ca , o ii 1 C 70' N CD an ' I 141 O O___----- 43e- vI w I \ ® N NI 0 LA t .1 11- --------------- --- (/)I 1 1 I >s -------------- 1 1 ` T \ \\ --------------- \ , „ , , .. 31.) leiz _ ____ I' Vr i ) 1• I Q l t / `\ ) ;i i `\i1 tri • p t \ \ `\ \ \\ \`. \\\ \`. `\� \-i-------- ��' '�� c ,! l i i ,1::°� i i ` J w g POLLUTION PREVENTION PLAN FOR PHASE EROSION& 660'°tea r0 SEDIMENT CONTROL PLAN >� a SHIMPENGINE RING, P.C. FREE sTATE Ruyv Rer Date � t x ENGINEERING-L9NDPIANNPUG-PROJECT MANAGEMENP N o it N oalza/zots as set 8�W $ g - W o ALBEMARLE COUNTY, VIRGINIA ^�`4 OC - \I[l<a•O 201 E MAIN ST. SUITE M PHONE: (434)227-'5140 CHARLOTTESVILLE. VA 22902 JUSTIN91SHIMP-CNOINEERINO.COM B. Sources of Pollutants, locations,and prevention practices Pollutant,or Pollutant Prevention Practices, kir Generating Activity Location on site Control Measures imp rr ✓r - C. Sources of Pollutants continued. Common activities and minimum control and prevention practices Pollutant,or Pollutant Prevention Practices, Generating Activity Location on site Control Measures Follow Erosion and Sediment Control Clearing,grading,excavating,and un- Land disturbance area Plan. Dispose of clearing debris at ito stabilized areas acceptable disposal sites.Seed and mulch, or sod within 7 days of land clearing Cover storm drain inlets and use drip pans Paving operations Roads and driveways and absorbent/oil dry for all paving ilk machines to limit leaks and spills Direct concrete wash water into a leak- Concrete washout and Current location and detail shown on proof container or leak-proof settling basin cement waste plan that is designed so that no overflows can rr occur Enclose or cover material storage areas. Mix paint indoors in a containment area or Structure construction,stucco, Structures in a flat unpaved area.Prevent the painting, and cleaning discharge of soaps,solvents,detergents and wash water,paint,form release oils and curing compounds. Water shall be filtered,settled or similarly Dewatering operations Dewatering sites shown on plan treated prior to discharge as shown on plan. Designated areas for material delivery and Material delivery and storage Designated area shown on plan storage. Placed near construction w r entrances,away from waterways and drainage paths Material use during building process Building areas Follow manufacturer's instructions. MSDS's attached. rr Waste collection area will not receive a +r substantial amount of runoff from upland areas and does not drain directly to a rr Pollutant,or Pollutant Prevention Practices, Generating Activity Location on site Control Measures Current designated container areas on waterway. Containers have lids covered Solid waste disposal plan before periods of rain,or are in a covered area. Scheduled collection to prevent overfilling.MATERIALS NOT TO BE or BURIED ON-SITE Convenient and well-maintained portable sanitary facilities will be provided,and Sanitary waste Current locations shown on plan located away from waterways or inlets. i Such facilities shall be regularly maintained. Apply fertilizers in accordance with Landscaping operations Landscape areas shown on plan manufacturer's recommendations and not +o during rainfall events To be treated in a sediment basin or better control as specified on plan.Minimize Wash Waters Wash areas shown on plan the discharge of pollutants from equipment and vehicle washing Vehicle and equipment washing Designated areas and details shown on Provide containment and filtering for all plan wash waters per the plan Provide double walled tanks,a lined irr Fueling Fueling station containment area,drip pans,and spill prevention and cleanup materials. rrt Minimization of exposure to precipitation and stormwater.Minimize the exposure of building materials,building products, construction wastes,trash,landscape materials,fertilizers,pesticides,herbicides,detergents,sanitary waste,and other materials present on the site to precipitation and to stormwater. rn (Identify all non-stormwater discharges to occur on your site. Keep this plan up-to-date with ongoing site No changes and inspections. See CGP, 9VAC25-880-70 section E for examples of non-stormwater discharges.) D. Non-stormwater discharges Pollutants or Pollutant Location on Site Discharge Constituents or Nilrr rw Ilia r. E. Persons responsible for pollution prevention practices ,a Free State Partners, LLC. F. Response and reporting practices ar Minimize discharges from spills and leaks. Minimize the discharge of pollutants from spills and leaks and implement chemical spill and leak prevention and response procedures as follows. To the extent practical,do not store oils, chemicals, or other potential contaminants on site. When storage of potential contaminants is required, provide secondary containment, such as spill berms or spill containment pallets. These should be located within the drainage areas to a sediment trap or sediment basin. Direct concrete wash water into a settling basin, dispose of hardened concrete with other construction waste debris to an appropriate waste facility. Respond to all spills, leaks and discharges as follows. Spills of oil,petroleum products, sanitary wastes, and • substances listed under 40 CFR parts 110, 117, and 302 should be cleaned up as soon as possible while protecting worker safety. Construct an earthen dike around any spills on dirt to prevent spreading. If a spill occurs during rainfall, cover it with a tarp or another impermeable cover to prevent contaminating runoff. Do • not bury any spills or wash them with water. Maintain a spill kits in a readily accessible location. A spill kit shall consist of a lined drum with bags of universal sorbents in the bottom, accessible without tipping the drum, sorbent socks above the bags, and personal protective equipment on the top. All materials used to remove the amcontaminants, including any water used to rinse equipment, and all dirt removed must be treated as contaminated. Textiles, such as from coveralls, may be sent to a certified laundry facility. Waste must be disposed of according to the standards of The County of Albemarle and the Commonwealth of Virginia. Store hazardous materials and wastes in covered containers. Report all spills, leaks and discharges as follows: All spills, leaks, and discharges shall be recorded in the a, inspection logs. If construction activity results in a discharge of contaminants that may be reasonably expected to enter surface waters,the operator shall notify the Department of Environmental Quality immediately or within 24 hours, and shall submit a written report within five days. For significant spills that cannot be controlled by personnel in the immediate vicinity, notify the local emergency response by dialing 911. The County of Albemarle must also be notified, and potentially some of the following agencies: the Fire Department, the Public Works Department, the Coast Guard, the Highway Patrol, the County Police Department, Department of Toxic Substances, OSHA, etc. For spills of federal reportable quantities, in conformance with the requirements in 40 CFR parts 110, 119, and 302, the contractor should notify the National Response Center at(800)424-8802. G. Pollution Prevention Awareness The engineer, project superintendent, and contractor shall have weekly meetings to review on-site conditions and advise contractor of potential risks that should be addressed. Contractor will be responsible for following procedures on a daily basis and applying appropriate waste management and prevention practices to be in compliance with the conditions of the general permit. Employees shall be informed of the danger to nature and • to human health of various chemical spills. .7. Section 7. Discharges to impaired waters, surface waters within an applicable TMDL wasteload allocation, and exceptional waters. No applicable TMDL. gis Section 8. Qualified personnel The following personnel are responsible for inspections: To Be Determined once a site contractor has been selected. isi INN WI OW ■ W NI NW Section 9. Signed Certification CERTIFICATION isr "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." rr r■ Owner/Operator Name: 'Q55 4c147e C'4 Company: Fri 1a G Title: /lam Signature: 1IVeeZ. Date: '/11/5- IMO rr rri ar rr +r �r. Section 10. Delegation of authority. tam Delegation of Authority r. I, (name), hereby designate the person or specifically described position below to be a duly authorized representative for the purpose of overseeing compliance with environmental requirements, including the Construction General Permit, at the construction site. The designee is authorized to sign any reports,stormwater pollution prevention plans and all other documents required by the permit. (name of person or position) (company) (address) (city, state,zip) rr (phone) By signing this authorization, I confirm that I meet the requirements to make such a designation as set forth in the Construction General Permit (CGP), and that the designee above meets the definition of a "duly authorized representative". r Operator Name: Company: Free, Pw✓- f� LL C Title: /144hk20v Signature: Date: 0/'L// NMI kit Section 11. General permit copy MO .r r. 11111 OM MN ass A MIMI COMMONWEALTH of VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY 11111 General Permit No.:VAR10 rr Effective Date:July 1,2014 as Expiration Date: June 30, 2019 — GENERAL VPDES PERMIT FOR DISCHARGES OF STORMWATER FROM CONSTRUCTION ACTIVITIES .r AUTHORIZATION TO DISCHARGE UNDER THE VIRGINIA STORMWATER MANAGEMENT PROGRAM AND THE VIRGINIA STORMWATER MANAGEMENT ACT In compliance with the provisions of the Clean Water Act, as amended, and pursuant to the Virginia Stormwater Management Act and regulations adopted pursuant thereto, operators of construction activities are authorized to discharge to surface waters within the boundaries of the Commonwealth of .,, Virginia, except those specifically named in State Water Control Board regulations that prohibit such discharges. The authorized discharge shall be in accordance with this cover page, Part I - Discharge Authorization — and Special Conditions, Part II - Stormwater Pollution Prevention Plan, and Part III - Conditions Applicable to All VPDES Permits as set forth herein. die 401 General Permit No.: VAR10 Page 1 of 23 PARTI DISCHARGE AUTHORIZATION AND SPECIAL CONDITIONS A. Coverage under this general permit. 1. During the period beginning with the date of coverage under this general permit and lasting until the general permit's expiration date, the operator is authorized to discharge stormwater from construction activities. 2. This general permit also authorizes stormwater discharges from support activities (e.g., concrete or as asphalt batch plants, equipment staging yards, material storage areas, excavated material disposal areas, borrow areas) located on-site or off-site provided that: a. The support activity is directly related to the construction activity that is required to have general permit coverage for discharges of stormwater from construction activities; b. The support activity is not a commercial operation, nor does it serve multiple unrelated �+ construction activities by different operators; c. The support activity does not operate beyond the completion of the last construction activity it supports; d. The support activity is identified in the registration statement at the time of general permit coverage; e. Appropriate control measures are identified in a stormwater pollution prevention plan and implemented to address the discharges from the support activity areas; and +■ f. All applicable state, federal, and local approvals are obtained for the support activity. B. Limitations on coverage. 1. Post-construction discharges. This general permit does not authorize stormwater discharges that originate from the site after construction activities have been completed and the site, including any support activity sites covered under the general permit registration, has undergone final stabilization. Post-construction industrial stormwater discharges may need to be covered by a separate VPDES permit. 2. Discharges mixed with nonstormwater. This general permit does not authorize discharges that are •• mixed with sources of nonstormwater, other than those discharges that are identified in Part I E (Authorized nonstormwater discharges)and are in compliance with this general permit. 3. Discharges covered by another state permit. This general permit does not authorize discharges of stormwater from construction activities that have been covered under an individual permit or required to obtain coverage under an alternative general permit. 4. Impaired waters and TMDL limitation. Discharges of stormwater from construction activities to surface waters identified as impaired in the 2012 § 305(b)/303(d) Water Quality Assessment Integrated Report or for which a TMDL wasteload allocation has been established and approved prior to the term of this general permit for (i) sediment or a sediment-related parameter (i.e., total suspended •• solids or turbidity)or(ii) nutrients(i.e., nitrogen or phosphorus) are not eligible for coverage under this general permit unless the operator develops, implements, and maintains a SWPPP that minimizes the pollutants of concern and, when applicable, is consistent with the assumptions and requirements of the approved TMDL wasteload allocations. In addition, the operator shall implement the following — items: UN r. General Permit No.: VAR10 Page 2 of 23 w a. The impaired water(s), approved TMDL(s), and pollutant(s) of concern, when applicable, shall be identified in the SWPPP; b. Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site; +• c. Nutrients shall be applied in accordance with manufacturer's recommendations or an approved nutrient management plan and shall not be applied during rainfall events; and d. The applicable SWPPP inspection requirements specified in Part II F 2 shall be amended as i" follows: (1) Inspections shall be conducted at a frequency of(i) at least once every four business days or (ii) at least once every five business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted on the next business day; and (2) Representative inspections used by utility line installation, pipeline construction, or other similar linear construction activities shall inspect all outfalls discharging to surface waters identified as impaired or for which a TMDL wasteload allocation has been established and - approved prior to the term of this general permit. 5. Exceptional waters limitation. Discharges of stormwater from construction activities not previously covered under the general permit issued in 2009 to exceptional waters identified in 9VAC25-260-30 A 3 c are not eligible for coverage under this general permit unless the operator implements the following: W a. The exceptional water(s) shall be identified in the SWPPP; b. Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site; c. Nutrients shall be applied in accordance with manufacturer's recommendations or an approved nutrient management plan and shall not be applied during rainfall events; and rr d. The applicable SWPPP inspection requirements specified in Part II F 2 shall be amended as follows: rn (1) Inspections shall be conducted at a frequency of(i) at least once every four business days or (ii) at least once every five business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted on the next business day; and (2) Representative inspections used by utility line installation, pipeline construction, or other similar linear construction activities shall inspect all outfalls discharging to exceptional waters. 6. There shall be no discharge of floating solids or visible foam in other than trace amounts. C. Commingled discharges. Discharges authorized by this general permit may be commingled with other sources of stormwater that are not required to be covered under a state permit, so long as the commingled discharge is in compliance with this general permit. Discharges authorized by a separate state or VPDES permit may be commingled with discharges authorized by this general permit so long as "" all such discharges comply with all applicable state and VPDES permit requirements. r.r N E General Permit No.:VAR10 Page 3 of 23 D. Prohibition of nonstormwater discharges. Except as provided in Parts I A 2, I C, and I E, all discharges covered by this general permit shall be composed entirely of stormwater associated with construction o r activities.All other discharges including the following are prohibited: 1. Wastewater from washout of concrete; 2. Wastewater from the washout and cleanout of stucco, paint, form release oils, curing compounds, and other construction materials; 3. Fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance; 4. Oils, toxic substances, or hazardous substances from spills or other releases; and 5. Soaps, solvents, or detergents used in equipment and vehicle washing. E. Authorized nonstormwater discharges. The following nonstormwater discharges from construction activities are authorized by this general permit when discharged in compliance with this general permit: 1. Discharges from firefighting activities; rr 2. Fire hydrant flushings; 3. Waters used to wash vehicles or equipment where soaps, solvents, or detergents have not been used and the wash water has been filtered, settled, or similarly treated prior to discharge; 4. Water used to control dust that has been filtered, settled, or similarly treated prior to discharge; 5. Potable water sources, including uncontaminated waterline flushings; air 6. Routine external building wash down where soaps, solvents or detergents have not been used and the wash water has been filtered, settled, or similarly treated prior to discharge; ""r 7. Pavement wash waters where spills or leaks of toxic or hazardous materials have not occurred (or where all spilled or leaked material has been removed prior to washing); where soaps, solvents, or detergents have not been used; and where the wash water has been filtered, settled, or similarly treated prior to discharge; 8. Uncontaminated air conditioning or compressor condensate; 9. Uncontaminated ground water or spring water; 10. Foundation or footing drains where flows are not contaminated with process materials such as solvents; rr 11. Uncontaminated excavation dewatering, including dewatering of trenches and excavations that have been filtered, settled, or similarly treated prior to discharge; and 12. Landscape irrigation. F.Termination of general permit coverage. 1. The operator of the construction activity shall submit a notice of termination in accordance with 9VAC25-880-60 to the VSMP authority after one or more of the following conditions have been met: r�. rr 111111 General Permit No.: VAR10 Page 4 of 23 a. Necessary permanent control measures included in the SWPPP for the site are in place and functioning effectively and final stabilization has been achieved on all portions of the site for which the operator is responsible. When applicable, long term responsibility and maintenance requirements shall be recorded in the local land records prior to the submission of a notice of termination; b. Another operator has assumed control over all areas of the site that have not been finally stabilized and obtained coverage for the ongoing discharge; c. Coverage under an alternative VPDES or state permit has been obtained; or " d. For residential construction only, temporary soil stabilization has been completed and the residence has been transferred to the homeowner. 2. The notice of termination should be submitted no later than 30 days after one of the above conditions in subdivision 1 of this subsection is met. Authorization to discharge terminates at midnight on the date that the notice of termination is submitted for the conditions set forth in subdivisions 1 b through 1 d of this subsection. Termination of authorizations to discharge for the conditions set forth in +++ subdivision 1 a of this subsection shall be effective upon notification from the department that the provisions of subdivision 1 a of this subsection have been met or 60 days after submittal of the notice of termination, whichever occurs first. 3. The notice of termination shall be signed in accordance with Part III K of this general permit. G.Water quality protection. 1. The operator must select, install, implement and maintain control measures as identified in the SWPPP at the construction site that minimize pollutants in the discharge as necessary to ensure that the operator's discharge does not cause or contribute to an excursion above any applicable water quality standard. 2. If it is determined by the department that the operator's discharges are causing, have reasonable potential to cause, or are contributing to an excursion above any applicable water quality standard, the department, in consultation with the VSMP authority, may take appropriate enforcement action and require the operator to: a. Modify or implement additional control measures in accordance with Part II B to adequately address the identified water quality concerns; b. Submit valid and verifiable data and information that are representative of ambient conditions and �+. indicate that the receiving water is attaining water quality standards; or c. Submit an individual permit application in accordance with 9VAC25-870-410 B 3. All written responses required under this chapter must include a signed certification consistent with Part III K. OSA rr MN irr General Permit No.: VAR10 Page 5 of 23 PART II STORMWATER POLLUTION PREVENTION PLAN A stormwater pollution prevention plan (SWPPP) shall be developed prior to the submission of a registration statement and implemented for the construction activity, including any support activity, covered by this general permit. SWPPPs shall be prepared in accordance with good engineering practices. Construction activities that are part of a larger common plan of development or sale and disturb less than one acre may utilize a SWPPP template provided by the department and need not provide a separate stormwater management plan if one has been prepared and implemented for the larger as common plan of development or sale. The SWPPP requirements of this general permit may be fulfilled by incorporating by reference other plans such as a spill prevention control and countermeasure (SPCC) plan developed for the site under§ 311 of ,., the federal Clean Water Act or best management practices (BMP) programs otherwise required for the facility provided that the incorporated plan meets or exceeds the SWPPP requirements of Part II A. All plans incorporated by reference into the SWPPP become enforceable under this general permit. If a plan incorporated by reference does not contain all of the required elements of the SWPPP, the operator must rr develop the missing elements and include them in the SWPPP. Any operator that was authorized to discharge under the general permit issued in 2009, and that intends to continue coverage under this general permit, shall update its stormwater pollution prevention plan to comply with the requirements of this general permit no later than 60 days after the date of coverage under this general permit. A. Stormwater pollution prevention plan contents.The SWPPP shall include the following items: 1. General information. as a. A signed copy of the registration statement, if required, for coverage under the general VPDES permit for discharges of stormwater from construction activities; b. Upon receipt, a copy of the notice of coverage under the general VPDES permit for discharges of stormwater from construction activities(i.e., notice of coverage letter); c. Upon receipt, a copy of the general VPDES permit for discharges of stormwater from construction amactivities; d. A narrative description of the nature of the construction activity, including the function of the project(e.g., low density residential, shopping mall, highway, etc.); a. e. A legible site plan identifying: (1) Directions of stormwater flow and approximate slopes anticipated after major grading activities; (2) Limits of land disturbance including steep slopes and natural buffers around surface waters that will not be disturbed; (3) Locations of major structural and nonstructural control measures, including sediment basins and traps, perimeter dikes, sediment barriers, and other measures intended to filter, settle, or +•� similarly treat sediment, that will be installed between disturbed areas and the undisturbed vegetated areas in order to increase sediment removal and maximize stormwater infiltration; (4) Locations of surface waters; all IS General Permit No.: VAR10 Page 6 of 23 (5) Locations where concentrated stormwater is discharged; (6) Locations of support activities, when applicable and when required by the VSMP authority, .ir including but not limited to (i) areas where equipment and vehicle washing, wheel wash water, and other wash water is to occur; (ii) storage areas for chemicals such as acids, fuels, fertilizers, and other lawn care chemicals; (iii) concrete wash out areas; (iv) vehicle fueling and maintenance areas; (v) sanitary waste facilities, including those temporarily placed on - the construction site; and (vi)construction waste storage; and (7) When applicable, the location of the on-site rain gauge or the methodology established in consultation with the VSMP authority used to identify measurable storm events for inspection as purposes. 2. Erosion and sediment control plan. NS a. An erosion and sediment control plan approved by the VESCP authority as authorized under the Erosion and Sediment Control Regulations (9VAC25-840), an "agreement in lieu of a plan" as defined in 9VAC25-840-10 from the VESCP authority, or an erosion and sediment control plan +■ prepared in accordance with annual standards and specifications approved by the department. Any operator proposing a new stormwater discharge from construction activities that is not required to obtain erosion and sediment control plan approval from a VESCP authority or does not adopt department-approved annual standards and specifications shall submit the erosion and "` sediment control plan to the department for review and approval. b. All erosion and sediment control plans shall include a statement describing the maintenance responsibilities required for the erosion and sediment controls used. c. A properly implemented approved erosion and sediment control plan, "agreement in lieu of a plan," or erosion and sediment control plan prepared in accordance with department-approved annual standards and specifications, adequately: (1) Controls the volume and velocity of stormwater runoff within the site to minimize soil erosion; (2) Controls stormwater discharges, including peak flow rates and total stormwater volume, to minimize erosion at outlets and to minimize downstream channel and stream bank erosion; (3) Minimizes the amount of soil exposed during the construction activity; (4) Minimizes the disturbance of steep slopes; .r (5) Minimizes sediment discharges from the site in a manner that addresses (i) the amount, frequency, intensity, and duration of precipitation; (ii) the nature of resulting stormwater runoff; and (iii) soil characteristics, including the range of soil particle sizes present on the site; (6) Provides and maintains natural buffers around surface waters, directs stormwater to vegetated areas to increase sediment removal, and maximizes stormwater infiltration, unless infeasible; (7) Minimizes soil compaction and, unless infeasible, preserves topsoil; +�+• (8) Ensures that stabilization of disturbed areas will be initiated immediately whenever any clearing, grading, excavating, or other land-disturbing activities have permanently ceased on any portion of the site, or temporarily ceased on any portion of the site and will not resume for a period exceeding 14 days; and rr am iss General Permit No.:VAR10 Page 7 of 23 (9) Utilizes outlet structures that withdraw stormwater from the surface (i.e., above the permanent pool or wet storage water surface elevation), unless infeasible, when discharging from sediment basins or sediment traps. ari 3. Stormwater management plan. a. New construction activities. A stormwater management plan approved by the VSMP authority as .r authorized under the Virginia Stormwater Management Program (VSMP) Regulation (9VAC25- 870), or an "agreement in lieu of a stormwater management plan" as defined in 9VAC25-870-10 from the VSMP authority, or a stormwater management plan prepared in accordance with annual standards and specifications approved by the department. Any operator proposing a new r stormwater discharge from construction activities that is not required to obtain stormwater management plan approval from a VSMP authority or does not adopt department-approved annual standards and specifications shall submit the stormwater management plan to the department for review and approval. b. Existing construction activities. Any operator that was authorized to discharge under the general permit issued in 2009, and that intends to continue coverage under this general permit, shall r ensure compliance with the requirements of 9VAC25-870-93 through 9VAC25-870-99 of the VSMP Regulation, including but not limited to the water quality and quantity requirements. The SWPPP shall include a description of, and all necessary calculations supporting, all post- construction stormwater management measures that will be installed prior to the completion of "' the construction process to control pollutants in stormwater discharges after construction operations have been completed. Structural measures should be placed on upland soils to the degree possible. Such measures must be designed and installed in accordance with applicable VESCP authority, VSMP authority, state, and federal requirements, and any necessary permits must be obtained. 4. Pollution prevention plan. A pollution prevention plan that addresses potential pollutant-generating ++� activities that may reasonably be expected to affect the quality of stormwater discharges from the construction activity, including any support activity. The pollution prevention plan shall: a. Identify the potential pollutant-generating activities and the pollutant that is expected to be "" exposed to stormwater; b. Describe the location where the potential pollutant-generating activities will occur, or if identified on the site plan, reference the site plan; c. Identify all nonstormwater discharges, as authorized in Part I E of this general permit, that are or will be commingled with stormwater discharges from the construction activity, including any ++� applicable support activity; d. Identify the person responsible for implementing the pollution prevention practice or practices for each pollutant-generating activity(if other than the person listed as the qualified personnel); ire e. Describe the pollution prevention practices and procedures that will be implemented to: (1) Prevent and respond to leaks, spills, and other releases including (i) procedures for expeditiously stopping, containing, and cleaning up spills, leaks, and other releases; and (ii) procedures for reporting leaks, spills, and other releases in accordance with Part III G; .. (2) Prevent the discharge of spilled and leaked fuels and chemicals from vehicle fueling and maintenance activities (e.g., providing secondary containment such as spill berms, decks, spill containment pallets, providing cover where appropriate, and having spill kits readily available); ■r rr General Permit No.:VAR10 Page 8 of 23 isr (3) Prevent the discharge of soaps, solvents, detergents, and wash water from construction materials, including the clean-up of stucco, paint, form release oils, and curing compounds (e.g., providing (i) cover (e.g., plastic sheeting or temporary roofs) to prevent contact with stormwater; (ii) collection and proper disposal in a manner to prevent contact with stormwater; and (iii) a similarly effective means designed to prevent discharge of these pollutants); (4) Minimize the discharge of pollutants from vehicle and equipment washing, wheel wash water, and other types of washing (e.g., locating activities away from surface waters and stormwater inlets or conveyance and directing wash waters to sediment basins or traps, using filtration r devices such as filter bags or sand filters, or using similarly effective controls); (5) Direct concrete wash water into a leak-proof container or leak-proof settling basin. The container or basin shall be designed so that no overflows can occur due to inadequate sizing or precipitation. Hardened concrete wastes shall be removed and disposed of in a manner consistent with the handling of other construction wastes. Liquid concrete wastes shall be removed and disposed of in a manner consistent with the handling of other construction wash waters and shall not be discharged to surface waters; sis (6) Minimize the discharge of pollutants from storage, handling, and disposal of construction products, materials, and wastes including (i) building products such as asphalt sealants, copper flashing, roofing materials, adhesives, and concrete admixtures; (ii) pesticides, herbicides, insecticides, fertilizers, and landscape materials; and (iii) construction and domestic wastes such as packaging materials, scrap construction materials, masonry products, timber, pipe and electrical cuttings, plastics, Styrofoam, concrete, and other trash or building materials; (7) Prevent the discharge of fuels, oils, and other petroleum products, hazardous or toxic wastes, and sanitary wastes; and (8) Address any other discharge from the potential pollutant-generating activities not addressed above; and f. Describe procedures for providing pollution prevention awareness of all applicable wastes, including any wash water, disposal practices, and applicable disposal locations of such wastes, to personnel in order to comply with the conditions of this general permit. The operator shall implement the procedures described in the SWPPP. 5. SWPPP requirements for discharges to impaired waters, surface waters with an applicable TMDL wasteload allocation established and approved prior to the term of this general permit, and - exceptional waters. The SWPPP shall: a. Identify the impaired water(s), approved TMDL(s), pollutant(s) of concern, and exceptional waters identified in 9VAC25-260-30 A 3 c,when applicable; b. Provide clear direction that: MN (1) Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site; (2) Nutrients shall be applied in accordance with manufacturer's recommendations or an approved nutrient management plan and shall not be applied during rainfall events; and (3) A modified inspection schedule shall be implemented in accordance with Part I B 4 or Part I B 5. General Permit No.: VAR10 Page 9 of 23 6. Qualified personnel. The name, phone number, and qualifications of the qualified personnel conducting inspections required by this general permit. 7. Delegation of authority. The individuals or positions with delegated authority, in accordance with Part III K, to sign inspection reports or modify the SWPPP. 8. SWPPP signature. The SWPPP shall be signed and dated in accordance with Part III K. rrr B. SWPPP amendments, modification, and updates. 1. The operator shall amend the SWPPP whenever there is a change in the design, construction, ismoperation, or maintenance that has a significant effect on the discharge of pollutants to surface waters and that has not been previously addressed in the SWPPP. 2. The SWPPP must be amended if, during inspections or investigations by the operator's qualified personnel, or by local, state, or federal officials, it is determined that the existing control measures are ineffective in minimizing pollutants in discharges from the construction activity. Revisions to the SWPPP shall include additional or modified control measures designed and implemented to correct +�+• problems identified. If approval by the VESCP authority, VSMP authority, or department is necessary for the control measure, revisions to the SWPPP shall be completed no later than seven calendar days following approval. Implementation of these additional or modified control measures must be accomplished as described in Part II G. 3. The SWPPP must clearly identify the contractor(s) that will implement and maintain each control measure identified in the SWPPP. The SWPPP shall be amended to identify any new contractor that will implement and maintain a control measure. 4. The operator shall update the SWPPP no later than seven days following any modification to its implementation. All modifications or updates to the SWPPP shall be noted and shall include the - following items: a. A record of dates when: (1) Major grading activities occur; (2) Construction activities temporarily or permanently cease on a portion of the site; and (3) Stabilization measures are initiated; b. Documentation of replaced or modified controls where periodic inspections or other information - have indicated that the controls have been used inappropriately or incorrectly and where modified as soon as possible; c. Areas that have reached final stabilization and where no further SWPPP or inspection requirements apply; d. All properties that are no longer under the legal control of the operator and the dates on which the operator no longer had legal control over each property; e. The date of any prohibited discharges, the discharge volume released, and what actions were taken to minimize the impact of the release; all f. Measures taken to prevent the reoccurrence of any prohibited discharge; and g. Measures taken to address any evidence identified as a result of an inspection required under "" Part II F. General Permit No.:VAR10 Page 10 of 23 5. Amendments, modifications, or updates to the SWPPP shall be signed in accordance with Part III K. C. Public Notification. Upon commencement of land disturbance, the operator shall post conspicuously a copy of the notice of coverage letter near the main entrance of the construction activity. For linear projects, the operator shall post the notice of coverage letter at a publicly accessible location near an active part of the construction project (e.g., where a pipeline crosses a public road). The operator shall .r maintain the posted information until termination of general permit coverage as specified in Part I F. D. SWPPP availability. 1. Operators with day-to-day operational control over SWPPP implementation shall have a copy of the SWPPP available at a central location on-site for use by those identified as having responsibilities under the SWPPP whenever they are on the construction site. rr 2. The operator shall make the SWPPP and all amendments, modifications, and updates available upon request to the department, the VSMP authority, the EPA, the VESCP authority, local government officials, or the operator of a municipal separate storm sewer system receiving discharges from the construction activity. If an on-site location is unavailable to store the SWPPP when no personnel are present, notice of the SWPPP's location must be posted near the main entrance of the construction site. 3. The operator shall make the SWPPP available for public review in an electronic format or in hard copy. Information for public access to the SWPPP shall be posted and maintained in accordance with Part II C. If not provided electronically, public access to the SWPPP may be arranged upon request at efta time and at a publicly accessible location convenient to the operator or his designee but shall be no less than once per month and shall be during normal business hours. Information not required to be contained within the SWPPP by this general permit is not required to be released. E. SWPPP implementation. The operator shall implement the SWPPP and subsequent amendments, modifications, and updates from commencement of land disturbance until termination of general permit coverage as specified in Part I F. 1. All control measures must be properly maintained in effective operating condition in accordance with good engineering practices and, where applicable, manufacturer specifications. If a site inspection required by Part II F identifies a control measure that is not operating effectively, corrective action(s) shall be completed as soon as practicable, but no later than seven days after discovery or a longer period as established by the VSMP authority, to maintain the continued effectiveness of the control measures. 2. If site inspections required by Part II F identify an existing control measure that needs to be modified or if an additional control measure is necessary for any reason, implementation shall be completed prior to the next anticipated measurable storm event. If implementation prior to the next anticipated measurable storm event is impracticable, then alternative control measures shall be implemented as soon as practicable, but no later than seven days after discovery or a longer period as established by the VSMP authority. F. SWPPP Inspections. 1. Personnel responsible for on-site and off-site inspections. Inspections required by this general permit shall be conducted by the qualified personnel identified by the operator in the SWPPP. The operator ... is responsible for insuring that the qualified personnel conduct the inspection. 2. Inspection schedule. a. Inspections shall be conducted at a frequency of: • w General Permit No.: VAR10 Page 11 of 23 11110 (1) At least once every five business days; or ., (2) At least once every 10 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted no later than the next business day. b. Where areas have been temporarily stabilized or land-disturbing activities will be suspended due to continuous frozen ground conditions and stormwater discharges are unlikely, the inspection frequency may be reduced to once per month. If weather conditions (such as above freezing temperatures or rain or snow events) make discharges likely, the operator shall immediately resume the regular inspection frequency. ,., c. Representative inspections may be utilized for utility line installation, pipeline construction, or other similar linear construction activities provided that: (1) Temporary or permanent soil stabilization has been installed and vehicle access may .is compromise the temporary or permanent soil stabilization and potentially cause additional land disturbance increasing the potential for erosion; (2) Inspections occur on the same frequency as other construction activities; r (3) Control measures are inspected along the construction site 0.25 miles above and below each access point (i.e., where a roadway, undisturbed right-of-way, or other similar feature All intersects the construction activity and access does not compromise temporary or permanent soil stabilization); and (4) Inspection locations are provided in the report required by Part II F. AO 3. Inspection requirements. r a. As part of the inspection, the qualified personnel shall: (1) Record the date and time of the inspection and when applicable the date and rainfall amount of the last measurable storm event; (2) Record the information and a description of any discharges occurring at the time of the inspection; (3) Record any land-disturbing activities that have occurred outside of the approved erosion and sediment control plan; (4) Inspect the following for installation in accordance with the approved erosion and sediment control plan, identification of any maintenance needs, and evaluation of effectiveness in minimizing sediment discharge, including whether the control has been inappropriately or incorrectly used: ar (a) All perimeter erosion and sediment controls, such as silt fence; (b) Soil stockpiles, when applicable, and borrow areas for stabilization or sediment trapping measures; (c) Completed earthen structures, such as dams, dikes, ditches, and diversions for stabilization; 4 a General Permit No.:VAR10 Page 12 of 23 (d) Cut and fill slopes; (e) Sediment basins and traps, sediment barriers, and other measures installed to control sediment discharge from stormwater; (f) Temporary or permanent channel, flume, or other slope drain structures installed to convey concentrated runoff down cut and fill slopes; (g) Storm inlets that have been made operational to ensure that sediment laden stormwater does not enter without first being filtered or similarly treated; and (h) Construction vehicle access routes that intersect or access paved roads for minimizing sediment tracking; - (5) Inspect areas that have reached final grade or that will remain dormant for more than 14 days for initiation of stabilization activities; (6) Inspect areas that have reached final grade or that will remain dormant for more than 14 days + for completion of stabilization activities within seven days of reaching grade or stopping work; (7) Inspect for evidence that the approved erosion and sediment control plan, "agreement in lieu of a plan," or erosion and sediment control plan prepared in accordance with department- "' approved annual standards and specifications has not been properly implemented. This includes but is not limited to: (a) Concentrated flows of stormwater in conveyances such as rills, rivulets or channels that have not been filtered, settled, or similarly treated prior to discharge, or evidence thereof; (b) Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; (c) Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance, or inadequate design are considered unprotected; (d) Sediment deposition on any property (including public and private streets) outside of the construction activity covered by this general permit; (e) Required stabilization has not been initiated or completed on portions of the site; (f) Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; me (g) Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and (h) Land disturbance outside of the approved area to be disturbed; •+ (8) Inspect pollutant generating activities identified in the pollution prevention plan for the proper implementation, maintenance and effectiveness of the procedures and practices; (9) Identify any pollutant generating activities not identified in the pollution prevention plan; and a General Permit No.: VAR10 Page 13 of 23 (10) Identify and document the presence of any evidence of the discharge of pollutants prohibited by this general permit. ,. 4. Inspection report. Each inspection report shall include the following items: a. The date and time of the inspection and when applicable, the date and rainfall amount of the last measurable storm event; b. Summarized findings of the inspection; .d c. The location(s)of prohibited discharges; d. The location(s)of control measures that require maintenance; ,., e. The location(s) of control measures that failed to operate as designed or proved inadequate or inappropriate for a particular location; f. The location(s)where any evidence identified under Part II F 3 a (7) exists; 110 g. The location(s) where any additional control measure is needed that did not exist at the time of inspection; h. A list of corrective actions required (including any changes to the SWPPP that are necessary) as a result of the inspection or to maintain permit compliance; i. Documentation of any corrective actions required from a previous inspection that have not been implemented; and j. The date and signature of the qualified personnel and the operator or its duly authorized •• representative. The inspection report and any actions taken in accordance with Part II must be retained by the operator as part of the SWPPP for at least three years from the date that general permit coverage expires or is ""' terminated. The inspection report shall identify any incidents of noncompliance. Where an inspection report does not identify any incidents of noncompliance, the report shall contain a certification that the construction activity is in compliance with the SWPPP and this general permit. The report shall be signed in accordance with Part III K of this general permit. G. Corrective actions. .. 1. The operator shall implement the corrective action(s) identified as a result of an inspection as soon as practicable but no later than seven days after discovery or a longer period as approved by the VSMP authority. If approval of a corrective action by a regulatory authority (e.g., VSMP authority, VESCP authority, or the department) is necessary, additional control measures shall be implemented to minimize pollutants in stormwater discharges until such approvals can be obtained. 2. The operator may be required to remove accumulated sediment deposits located outside of the construction activity covered by this general permit as soon as practicable in order to minimize environmental impacts. The operator shall notify the VSMP authority and the department as well as obtain all applicable federal, state, and local authorizations, approvals, and permits prior to the removal of sediments accumulated in surface waters including wetlands. i.r General Permit No.: VAR10 Page 14 of 23 r PART III CONDITIONS APPLICABLE TO ALL VPDES PERMITS rr NOTE: Discharge monitoring is not required for this general permit. If the operator chooses to monitor stormwater discharges or control measures, the operator must comply with the requirements of subsections A, B, and C, as appropriate. A. Monitoring. 1. Samples and measurements taken for the purpose of monitoring shall be representative of the monitoring activity. 2. Monitoring shall be conducted according to procedures approved under 40 CFR Part 136 or sui alternative methods approved by the U.S. Environmental Protection Agency, unless other procedures have been specified in this general permit. Analyses performed according to test procedures approved under 40 CFR Part 136 shall be performed by an environmental laboratory certified under regulations adopted by the Department of General Services(1 VAC30-45 or 1 VAC30-46). 3. The operator shall periodically calibrate and perform maintenance procedures on all monitoring and analytical instrumentation at intervals that will ensure accuracy of measurements. B. Records. 1. Monitoring records and reports shall include: a. The date, exact place, and time of sampling or measurements; b. The individual(s)who performed the sampling or measurements; c. The date(s)and time(s)analyses were performed; d. The individual(s)who performed the analyses; e. The analytical techniques or methods used; and „, f. The results of such analyses. 2. The operator shall retain records of all monitoring information, including all calibration and maintenance records and all original strip chart recordings for continuous monitoring instrumentation, .. copies of all reports required by this general permit, and records of all data used to complete the registration statement for this general permit, for a period of at least three years from the date of the sample, measurement, report or request for coverage. This period of retention shall be extended automatically during the course of any unresolved litigation regarding the regulated activity or regarding control standards applicable to the operator, or as requested by the board. C. Reporting monitoring results. 1. The operator shall update the SWPPP to include the results of the monitoring as may be performed in accordance with this general permit, unless another reporting schedule is specified elsewhere in this general permit. 2. Monitoring results shall be reported on a discharge monitoring report (DMR); on forms provided, approved or specified by the department; or in any format provided that the date, location, parameter, method, and result of the monitoring activity are included. • own General Permit No.:VAR10 Page 15 of 23 3. If the operator monitors any pollutant specifically addressed by this general permit more frequently than required by this general permit using test procedures approved under 40 CFR Part 136 or using other test procedures approved by the U.S. Environmental Protection Agency or using procedures ,,,, specified in this general permit, the results of this monitoring shall be included in the calculation and reporting of the data submitted in the DMR or reporting form specified by the department. 4. Calculations for all limitations which require averaging of measurements shall utilize an arithmetic mean unless otherwise specified in this general permit. D. Duty to provide information. The operator shall furnish,within a reasonable time, any information which the board may request to determine whether cause exists for modifying, revoking and reissuing, or terminating this general permit or to determine compliance with this general permit. The board, department, EPA, or VSMP authority may require the operator to furnish, upon request, such plans, specifications, and other pertinent information as may be necessary to determine the effect of the wastes from his discharge on the quality of surface waters, or such other information as may be necessary to accomplish the purposes of the CWA and the Virginia Stormwater Management Act. The operator shall also furnish to the board, department, EPA, or VSMP authority, upon request, copies of records required to be kept by this general permit. E. Compliance schedule reports. Reports of compliance or noncompliance with, or any progress reports on, interim and final requirements contained in any compliance schedule of this general permit shall be submitted no later than 14 days following each schedule date. F. Unauthorized stormwater discharges. Pursuant to § 62.1-44.5 of the Code of Virginia, except in compliance with a state permit issued by the department, it shall be unlawful to cause a stormwater discharge from a construction activity. G. Reports of unauthorized discharges. Any operator who discharges or causes or allows a discharge of sewage, industrial waste, other wastes or any noxious or deleterious substance or a hazardous .. substance or oil in an amount equal to or in excess of a reportable quantity established under either 40 CFR Part 110, 40 CFR Part 117, 40 CFR Part 302, or§62.1-44.34:19 of the Code of Virginia that occurs during a 24-hour period into or upon surface waters or who discharges or causes or allows a discharge that may reasonably be expected to enter surface waters, shall notify the Department of Environmental Quality of the discharge immediately upon discovery of the discharge, but in no case later than within 24 hours after said discovery. A written report of the unauthorized discharge shall be submitted to the department and the VSMP authority within five days of discovery of the discharge. The written report shall contain: 1. A description of the nature and location of the discharge; 2. The cause of the discharge; 3. The date on which the discharge occurred; 4. The length of time that the discharge continued; 5. The volume of the discharge; 6. If the discharge is continuing, how long it is expected to continue; 7. If the discharge is continuing, what the expected total volume of the discharge will be; and arr 8. Any steps planned or taken to reduce, eliminate and prevent a recurrence of the present discharge or any future discharges not authorized by this general permit. General Permit No.: VAR10 Page 16 of 23 Discharges reportable to the department and the VSMP authority under the immediate reporting requirements of other regulations are exempted from this requirement. ,,,r, H. Reports of unusual or extraordinary discharges. If any unusual or extraordinary discharge including a "bypass" or"upset," as defined herein, should occur from a facility and the discharge enters or could be expected to enter surface waters, the operator shall promptly notify, in no case later than within 24 hours, the department and the VSMP authority by telephone after the discovery of the discharge. This notification shall provide all available details of the incident, including any adverse effects on aquatic life and the known number of fish killed. The operator shall reduce the report to writing and shall submit it to the department and the VSMP authority within five days of discovery of the discharge in accordance with Part III 12. Unusual and extraordinary discharges include but are not limited to any discharge resulting r. from: 1. Unusual spillage of materials resulting directly or indirectly from processing operations; 2. Breakdown of processing or accessory equipment; 3. Failure or taking out of service of some or all of the facilities; and MN 4. Flooding or other acts of nature. I. Reports of noncompliance. The operator shall report any noncompliance which may adversely affect surface waters or may endanger public health. 1. An oral report to the department and the VSMP authority shall be provided within 24 hours from the MINtime the operator becomes aware of the circumstances. The following shall be included as information that shall be reported within 24 hours under this subdivision: a. Any unanticipated bypass; and die b. Any upset that causes a discharge to surface waters. 2. A written report shall be submitted within five days and shall contain: ,rr a. A description of the noncompliance and its cause; b. The period of noncompliance, including exact dates and times, and if the noncompliance has not been corrected,the anticipated time it is expected to continue; and c. Steps taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance. The department may waive the written report on a case-by-case basis for reports of noncompliance under Part III I if the oral report has been received within 24 hours and no adverse impact on surface waters has been reported. Ira 3. The operator shall report all instances of noncompliance not reported under Part III 11 or 2 in writing as part of the SWPPP. The reports shall contain the information listed in Part III 12. NOTE: The reports required in Part III G, H and I shall be made to the department and the VSMP authority. Reports may be made by telephone, email, or by fax. For reports outside normal working hours, leaving a recorded message shall fulfill the immediate reporting requirement. For emergencies, the Virginia Department of Emergency Management maintains a 24-hour telephone service at 1-800-468- 8892. ir. General Permit No.: VAR10 Page 17 of 23 4. Where the operator becomes aware of a failure to submit any relevant facts, or submittal of incorrect information in any report, including a registration statement, to the department or the VSMP authority, the operator shall promptly submit such facts or correct information. J. Notice of planned changes. 1. The operator shall give notice to the department and the VSMP authority as soon as possible of any - planned physical alterations or additions to the permitted facility or activity. Notice is required only when: a. The operator plans an alteration or addition to any building, structure, facility, or installation that may meet one of the criteria for determining whether a facility is a new source in 9VAC25-870- 420; b. The operator plans an alteration or addition that would significantly change the nature or increase the quantity of pollutants discharged. This notification applies to pollutants that are not subject to effluent limitations in this general permit; or �+ 2. The operator shall give advance notice to the department and VSMP authority of any planned changes in the permitted facility or activity, which may result in noncompliance with state permit requirements. K. Signatory requirements. 1. Registration statement.All registration statements shall be signed as follows: rr a. For a corporation: by a responsible corporate officer. For the purpose of this chapter, a responsible corporate officer means: (i) a president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function, or any other person who performs similar policy-making or decision-making functions for the corporation; or(ii) the manager of one or more manufacturing, production, or operating facilities, provided the manager is authorized to make management decisions that govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long-term compliance with environmental laws and regulations; the manager can ensure that the necessary systems are established or actions taken to gather complete and accurate information for state permit application requirements; and r where authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures; b. For a partnership or sole proprietorship: by a general partner or the proprietor, respectively; or c. For a municipality, state, federal, or other public agency: by either a principal executive officer or ranking elected official. For purposes of this chapter, a principal executive officer of a public agency includes: (i) the chief executive officer of the agency or (ii) a senior executive officer " having responsibility for the overall operations of a principal geographic unit of the agency. 2. Reports, etc. All reports required by this general permit, including SWPPPs, and other information requested by the board or the department shall be signed by a person described in Part III K 1 or by a duly authorized representative of that person.A person is a duly authorized representative only if: a. The authorization is made in writing by a person described in Part III K 1; b. The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the operator. (A duly authorized rr General Permit No.:VAR10 Page 18 of 23 r. representative may thus be either a named individual or any individual occupying a named position); and c. The signed and dated written authorization is included in the SWPPP.A copy must be provided to the department and VSMP authority, if requested. 3. Changes to authorization. If an authorization under Part III K 2 is no longer accurate because a +� different individual or position has responsibility for the overall operation of the construction activity, a new authorization satisfying the requirements of Part III K 2 shall be submitted to the VSMP authority as the administering entity for the board prior to or together with any reports or information to be rr signed by an authorized representative. 4. Certification. Any person signing a document under Part III K 1 or 2 shall make the following certification: "I certify under penalty of law that I have read and understand this document and that this document and all attachments were prepared in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the +■ person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." air L. Duty to comply. The operator shall comply with all conditions of this general permit. Any state permit noncompliance constitutes a violation of the Virginia Stormwater Management Act and the Clean Water Act, except that noncompliance with certain provisions of this general permit may constitute a violation of the Virginia Stormwater Management Act but not the Clean Water Act. Permit noncompliance is grounds for enforcement action; for state permit termination, revocation and reissuance, or modification; or denial of a state permit renewal application. d+ The operator shall comply with effluent standards or prohibitions established under§ 307(a) of the Clean Water Act for toxic pollutants within the time provided in the regulations that establish these standards or prohibitions or standards for sewage sludge use or disposal, even if this general permit has not yet been modified to incorporate the requirement. M. Duty to reapply. If the operator wishes to continue an activity regulated by this general permit after the expiration date of this general permit, the operator shall submit a new registration statement at least 90 ,,, days before the expiration date of the existing general permit, unless permission for a later date has been granted by the board. The board shall not grant permission for registration statements to be submitted later than the expiration date of the existing general permit. N. Effect of a state permit. This general permit does not convey any property rights in either real or personal property or any exclusive privileges, nor does it authorize any injury to private property or invasion of personal rights, or any infringement of federal, state or local law or regulations. O. State law. Nothing in this general permit shall be construed to preclude the institution of any legal action under, or relieve the operator from any responsibilities, liabilities, or penalties established pursuant to any other state law or regulation or under authority preserved by§ 510 of the Clean Water Act. Except as provided in general permit conditions on "bypassing" (Part III U) and "upset"(Part III V), nothing in this general permit shall be construed to relieve the operator from civil and criminal penalties for noncompliance. P. Oil and hazardous substance liability. Nothing in this general permit shall be construed to preclude the institution of any legal action or relieve the operator from any responsibilities, liabilities, or penalties to which the operator is or may be subject under§§62.1-44.34:14 through 62.1-44.34:23 of the State Water Control Law or§311 of the Clean Water Act. rrr General Permit No.: VAR10 Page 19 of 23 Q. Proper operation and maintenance. The operator shall at all times properly operate and maintain all facilities and systems of treatment and control (and related appurtenances), which are installed or used by the operator to achieve compliance with the conditions of this general permit. Proper operation and maintenance also includes effective plant performance, adequate funding, adequate staffing, and adequate laboratory and process controls, including appropriate quality assurance procedures. This provision requires the operation of back-up or auxiliary facilities or similar systems, which are installed by the operator only when the operation is necessary to achieve compliance with the conditions of this rr general permit. R. Disposal of solids or sludges. Solids, sludges or other pollutants removed in the course of treatment or management of pollutants shall be disposed of in a manner so as to prevent any pollutant from such " materials from entering surface waters and in compliance with all applicable state and federal laws and regulations. S. Duty to mitigate. The operator shall take all steps to minimize or prevent any discharge in violation of this general permit that has a reasonable likelihood of adversely affecting human health or the environment. .r T. Need to halt or reduce activity not a defense. It shall not be a defense for an operator in an enforcement action that it would have been necessary to halt or reduce the permitted activity in order to maintain compliance with the conditions of this general permit. U. Bypass. 1. "Bypass," as defined in 9VAC25-870-10, means the intentional diversion of waste streams from any all portion of a treatment facility. The operator may allow any bypass to occur that does not cause effluent limitations to be exceeded, but only if it also is for essential maintenance to ensure efficient operation.These bypasses are not subject to the provisions of Part III U 2 and 3. 2. Notice. a. Anticipated bypass. If the operator knows in advance of the need for a bypass, the operator shall submit prior notice to the department, if possible at least 10 days before the date of the bypass. b. Unanticipated bypass. The operator shall submit notice of an unanticipated bypass as required in Part III I. 3. Prohibition of bypass. a. Except as provided in Part III U 1, bypass is prohibited, and the board or department may take enforcement action against an operator for bypass unless: (1) Bypass was unavoidable to prevent loss of life, personal injury, or severe property damage. Severe property damage means substantial physical damage to property, damage to the treatment facilities that causes them to become inoperable, or substantial and permanent loss of natural resources that can reasonably be expected to occur in the absence of a bypass. Severe property damage does not mean economic loss caused by delays in production; (2) There were no feasible alternatives to the bypass, such as the use of auxiliary treatment facilities, retention of untreated wastes, or maintenance during normal periods of equipment .. downtime. This condition is not satisfied if adequate back-up equipment should have been installed in the exercise of reasonable engineering judgment to prevent a bypass that occurred during normal periods of equipment downtime or preventive maintenance; and "" (3) The operator submitted notices as required under Part III U 2. r. General Permit No.: VAR10 Page 20 of 23 .r b. The department may approve an anticipated bypass, after considering its adverse effects, if the department determines that it will meet the three conditions listed in Part III U 3 a. V. Upset. 1. An "upset," as defined in 9VAC25-870-10, means an exceptional incident in which there is unintentional and temporary noncompliance with technology-based state permit effluent limitations 'e because of factors beyond the reasonable control of the operator. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or improper operation. 11111` 2. An upset constitutes an affirmative defense to an action brought for noncompliance with technology- based state permit effluent limitations if the requirements of Part III V 4 are met. A determination made during administrative review of claims that noncompliance was caused by upset, and before an action for noncompliance, is not a final administrative action subject to judicial review. 3. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventative maintenance, or .r careless or improper operation. 4. An operator who wishes to establish the affirmative defense of upset shall demonstrate, through properly signed, contemporaneous operating logs or other relevant evidence that: a. An upset occurred and that the operator can identify the cause(s)of the upset; b. The permitted facility was at the time being properly operated; c. The operator submitted notice of the upset as required in Part III I; and d. The operator complied with any remedial measures required under Part III S. 5. In any enforcement proceeding, the operator seeking to establish the occurrence of an upset has the burden of proof. W. Inspection and entry. The operator shall allow the department as the board's designee, the VSMP authority, EPA, or an authorized representative of either entity (including an authorized contractor), upon presentation of credentials and other documents as may be required by law to: 1. Enter upon the operator's premises where a regulated facility or activity is located or conducted, or where records must be kept under the conditions of this general permit; 2. Have access to and copy, at reasonable times, any records that must be kept under the conditions of this general permit; "' 3. Inspect and photograph at reasonable times any facilities, equipment (including monitoring and control equipment), practices, or operations regulated or required under this general permit; and 4. Sample or monitor at reasonable times, for the purposes of ensuring state permit compliance or as otherwise authorized by the Clean Water Act or the Virginia Stormwater Management Act, any substances or parameters at any location. - For purposes of this section, the time for inspection shall be deemed reasonable during regular business hours, and whenever the facility is discharging. Nothing contained herein shall make an inspection unreasonable during an emergency. General Permit No.: VAR10 Page 21 of 23 X. State permit actions. State permits may be modified, revoked and reissued, or terminated for cause. The filing of a request by the operator for a state permit modification, revocation and reissuance, or termination, or a notification of planned changes or anticipated noncompliance does not stay any state permit condition. Y. Transfer of state permits. 1. State permits are not transferable to any person except after notice to the department. Except as provided in Part III Y 2, a state permit may be transferred by the operator to a new operator only if the state permit has been modified or revoked and reissued, or a minor modification made, to identify the new operator and incorporate such other requirements as may be necessary under the Virginia �r Stormwater Management Act and the Clean Water Act. 2. As an alternative to transfers under Part III Y 1, this state permit may be automatically transferred to a Ira new operator if: a. The current operator notifies the department at least 30 days in advance of the proposed transfer of the title to the facility or property; r b. The notice includes a written agreement between the existing and new operators containing a specific date for transfer of state permit responsibility, coverage, and liability between them; and MIR c. The department does not notify the existing operator and the proposed new operator of its intent to modify or revoke and reissue the state permit. If this notice is not received, the transfer is effective on the date specified in the agreement mentioned in Part III Y 2 b. 3. For ongoing construction activity involving a change of operator, the new operator shall accept and maintain the existing SWPPP, or prepare and implement a new SWPPP prior to taking over operations at the site. Z. Severability. The provisions of this general permit are severable, and if any provision of this general permit or the application of any provision of this state permit to any circumstance, is held invalid, the application of such provision to other circumstances and the remainder of this general permit shall not be "" affected thereby. rr w General Permit No.: VAR10 Page 22 of 23 rr DEFINITIONS "Business day"means Monday through Friday excluding state holidays. rr "Commencement of land disturbance" means the initial disturbance of soils associated with clearing, grading, or excavating activities or other construction activities(e.g., stockpiling of fill material). +■ "Construction site" means the land where any land-disturbing activity is physically located or conducted, including any adjacent land used or preserved in connection with the land-disturbing activity. irr "Final stabilization" means that one of the following situations has occurred: 1. All soil disturbing activities at the site have been completed and a permanent vegetative cover has been established on denuded areas not otherwise permanently stabilized. Permanent vegetation ;,,,,,11 shall not be considered established until a ground cover is achieved that is uniform (e.g., evenly distributed), mature enough to survive, and will inhibit erosion. 2. For individual lots in residential construction, final stabilization can occur by either: a. The homebuilder completing final stabilization as specified in subdivision 1 of this definition; or b. The homebuilder establishing temporary soil stabilization, including perimeter controls for an .. individual lot prior to occupation of the home by the homeowner, and informing the homeowner of the need for, and benefits of,final stabilization. 3. For construction projects on land used for agricultural purposes, final stabilization may be accomplished by returning the disturbed land to its preconstruction agricultural use. Areas disturbed that were not previously used for agricultural activities, such as buffer strips immediately adjacent to surface waters, and areas that are not being returned to their preconstruction agricultural use must +�+ meet the final stabilization criteria specified in subdivision 1 or 2 of this definition. "Immediately" means as soon as practicable, but no later than the end of the next business day, following the day when the land-disturbing activities have temporarily or permanently ceased. In the context of this general permit, "immediately" is used to define the deadline for initiating stabilization measures. "Impaired waters"means surface waters identified as impaired on the 2012 § 305(b)/303(d)Water Quality Assessment Integrated Report. "Infeasible" means not technologically possible or not economically practicable and achievable in light of best industry practices. "Initiation of stabilization activities"means: 1. Prepping the soil for vegetative or nonvegetative stabilization; rie 2. Applying mulch or other nonvegetative product to the exposed area; 3. Seeding or planting the exposed area; 4. Starting any of the above activities on a portion of the area to be stabilized, but not on the entire area; or 5. Finalizing arrangements to have the stabilization product fully installed in compliance with the applicable deadline for completing stabilization. This list is not exhaustive. rr reg General Permit No.: VAR10 Page 23 of 23 "Measurable storm event" means a rainfall event producing 0.25 inches of rain or greater over 24 hours. "Stabilized" means land that has been treated to withstand normal exposure to natural forces without incurring erosion damage. .r IIIM Jim Free State SWPPP Inspection Log Inspection: Last Rainfall: Date Time Date Rainfall Amount Summary(requirements on back of sheet): all r Locations of: • Prohibited discharges • Controls needing maintenance all • Failed controls: r • Evidence that ESCP has not been properly implemented: • Additional measures needed: Corrective actions required: Unimplemented corrective actions from previous inspection: gal — Inspector Signature Date Operator Signature Date .r� Inspections shall be completed at least once everyfour business days; or at least once every 5 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days,the inspection shall be conducted on the next business day. Inspection requirements: Describe discharges at time of inspection Record land-disturbing activities outside approved ESCP Inspect proper installation, maintenance needs, and effectiveness of: — Perimeter controls, such as silt fence — Soil stockpiles and borrow areas — Completed earthen structures(dams,dikes, ditches, diversions, etc.) — Cut and fill slopes — Sediment basins and traps,sediment barriers,etc. — Channels,flumes, slope drains,etc. — Operational storm inlets — Construction vehicle access routes Areas at final grade or to remain dormant for more than 14 days: — Initiate stabilization activities — Complete stabilization activities within 7 days of stopping work Evidence that ESCP has not been properly implemented: — Concentrated flows of stormwater in conveyances such as rills,rivulets or channels that have not been filtered, settled,or similarly treated prior to discharge, or evidence thereof; 60 I — Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; r — Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance,or inadequate design are considered unprotected; — Sediment deposition on any property(including public and private streets)outside of the construction activity covered by this general permit; — Required stabilization has not been initiated or completed on portions of the site; — Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; .,. — Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and — Land disturbance outside of the approved area to be disturbed Pollutant generating activities from PPP: implementation, maintenance,and effectiveness Pollutant generating activities not identified in PPP , .; .. Free State SWPPP Inspection Log Inspection: Last Rainfall: NIB Date Time Date Rainfall Amount Summary(requirements on back of sheet): Locations of: • Prohibited discharges MS ON • Controls needing maintenance • Failed controls: • Evidence that ESCP has not been properly implemented: •. • Additional measures needed: Corrective actions required: Unimplemented corrective actions from previous inspection: .. Inspector Signature Date Operator Signature Date •r t Inspections shall be completed at least once every four business days;or at least once every 5 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days,the inspection shall be conducted on the next business day. Inspection requirements: Describe discharges at time of inspection Record land-disturbing activities outside approved ESCP Inspect proper installation, maintenance needs, and effectiveness of: — Perimeter controls,such as silt fence — Soil stockpiles and borrow areas — Completed earthen structures(dams,dikes, ditches,diversions, etc.) — Cut and fill slopes — Sediment basins and traps, sediment barriers,etc. — Channels,flumes,slope drains, etc. — Operational storm inlets — Construction vehicle access routes Areas at final grade or to remain dormant for more than 14 days: — Initiate stabilization activities — Complete stabilization activities within 7 days of stopping work Evidence that ESCP has not been properly implemented: — Concentrated flows of stormwater in conveyances such as rills,rivulets or channels that have not been filtered,settled,or similarly treated prior to discharge, or evidence thereof; — Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; — Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance, or inadequate design are considered unprotected; — Sediment deposition on any property(including public and private streets)outside of the construction activity covered by this general permit; — Required stabilization has not been initiated or completed on portions of the site; — Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; — Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and — Land disturbance outside of the approved area to be disturbed Pollutant generating activities from PPP: implementation, maintenance,and effectiveness Pollutant generating activities not identified in PPP am Free State SWPPP Inspection Log Inspection: Last Rainfall: Date Time Date Rainfall Amount �- Summary(requirements on back of sheet): Locations of: • Prohibited discharges ma • Controls needing maintenance am • Failed controls: ims • Evidence that ESCP has not been properly implemented: -• • Additional measures needed: Corrective actions required: Unimplemented corrective actions from previous inspection: NM Inspector Signature Date Operator Signature Date r r 1 Inspections shall be completed at least once everyfour business days; or at least once every 5 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days,the inspection shall be I conducted on the next business day. Inspection requirements: Describe discharges at time of inspection Record land-disturbing activities outside approved ESCP Inspect proper installation, maintenance needs,and effectiveness of: I — Perimeter controls,such as silt fence — Soil stockpiles and borrow areas — Completed earthen structures(dams, dikes, ditches, diversions,etc.) — Cut and fill slopes — Sediment basins and traps,sediment barriers, etc. — Channels,flumes,slope drains,etc. — Operational storm inlets — Construction vehicle access routes Areas at final grade or to remain dormant for more than 14 days: — Initiate stabilization activities — Complete stabilization activities within 7 days of stopping work Evidence that ESCP has not been properly implemented: — Concentrated flows of stormwater in conveyances such as rills,rivulets or channels that have not been filtered,settled,or similarly treated prior to discharge,or evidence thereof; — Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; — Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance,or inadequate design are considered unprotected; — Sediment deposition on any property(including public and private streets)outside of the construction activity covered by this general permit; — Required stabilization has not been initiated or completed on portions of the site; — Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; — Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and — Land disturbance outside of the approved area to be disturbed Pollutant generating activities from PPP: implementation, maintenance, and effectiveness Pollutant generating activities not identified in PPP i Free State SWPPP Inspection Log Inspection: Last Rainfall: Date Time Date Rainfall Amount "' Summary(requirements on back of sheet): ✓ •` Locations of: • Prohibited discharges ..r • Controls needing maintenance • Failed controls: • Evidence that ESCP has not been properly implemented: • Additional measures needed: Corrective actions required: Unimplemented corrective actions from previous inspection: 11011 w Inspector Signature Date Operator Signature Date rn 1 Inspections shall be completed at least once everyfour business days; or at least once every 5 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days,the inspection shall be conducted on the next business day. Inspection requirements: I Describe discharges at time of inspection Record land-disturbing activities outside approved ESCP Inspect proper installation, maintenance needs,and effectiveness of: — Perimeter controls,such as silt fence — Soil stockpiles and borrow areas — Completed earthen structures(dams,dikes,ditches, diversions,etc.) — Cut and fill slopes — Sediment basins and traps,sediment barriers, etc. — Channels,flumes, slope drains,etc. — Operational storm inlets — Construction vehicle access routes Areas at final grade or to remain dormant for more than 14 days: 1 — Initiate stabilization activities — Complete stabilization activities within 7 days of stopping work Evidence that ESCP has not been properly implemented: — Concentrated flows of stormwater in conveyances such as rills,rivulets or channels that have not been filtered, settled,or similarly treated prior to discharge, or evidence thereof; — Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; • — Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance, or inadequate design are considered unprotected; — Sediment deposition on any property(including public and private streets)outside of the construction activity covered by this general permit; — Required stabilization has not been initiated or completed on portions of the site; — Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; — Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and — Land disturbance outside of the approved area to be disturbed Pollutant generating activities from PPP: implementation, maintenance,and effectiveness Pollutant generating activities not identified in PPP 1 1 rr Free State SWPPP Inspection Log Inspection: Last Rainfall: +r. Date Time Date Rainfall Amount ••• Summary(requirements on back of sheet): as Locations of: • Prohibited discharges rr n• • Controls needing maintenance MN • Failed controls: • Evidence that ESCP has not been properly implemented: it • Additional measures needed: Corrective actions required: ars Unimplemented corrective actions from previous inspection: irm Inspector Signature Date Operator Signature Date rr 1 Inspections shall be completed at least once everyfour business days; or at least once every 5 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days,the inspection shall be 1 conducted on the next business day. Inspection requirements: 1 Describe discharges at time of inspection Record land-disturbing activities outside approved ESCP Inspect proper installation, maintenance needs,and effectiveness of: — Perimeter controls, such as silt fence — Soil stockpiles and borrow areas — Completed earthen structures(dams, dikes, ditches, diversions, etc.) — Cut and fill slopes — Sediment basins and traps, sediment barriers, etc. — Channels,flumes, slope drains, etc. — Operational storm inlets — Construction vehicle access routes Areas at final grade or to remain dormant for more than 14 days: — Initiate stabilization activities — Complete stabilization activities within 7 days of stopping work Evidence that ESCP has not been properly implemented: — Concentrated flows of stormwater in conveyances such as rills,rivulets or channels that have not been filtered, settled,or similarly treated prior to discharge,or evidence thereof; — Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; — Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance, or inadequate design are considered unprotected; — Sediment deposition on any property(including public and private streets)outside of the construction activity covered by this general permit; — Required stabilization has not been initiated or completed on portions of the site; — Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; — Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and — Land disturbance outside of the approved area to be disturbed Pollutant generating activities from PPP: implementation, maintenance,and effectiveness Pollutant generating activities not identified in PPP 1 1 �- Free State SWPPP Inspection Log Inspection: Last Rainfall: Date Time Date Rainfall Amount Summary(requirements on back of sheet): ma Locations of: • Prohibited discharges Oh • Controls needing maintenance air • Failed controls: rr • Evidence that ESCP has not been properly implemented: +r. r. • Additional measures needed: rrr Corrective actions required: r. Unimplemented corrective actions from previous inspection: Oil IMO Inspector Signature Date Operator Signature Date rr rr 1 Inspections shall be completed at least once everyfour business days; or at least once every 5 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days,the inspection shall be conducted on the next business day. Inspection requirements: Describe discharges at time of inspection Record land-disturbing activities outside approved ESCP Inspect proper installation, maintenance needs, and effectiveness of: — Perimeter controls,such as silt fence — Soil stockpiles and borrow areas — Completed earthen structures(dams,dikes, ditches, diversions,etc.) — Cut and fill slopes — Sediment basins and traps,sediment barriers, etc. — Channels,flumes, slope drains, etc. — Operational storm inlets — Construction vehicle access routes Areas at final grade or to remain dormant for more than 14 days: — Initiate stabilization activities — Complete stabilization activities within 7 days of stopping work Evidence that ESCP has not been properly implemented: — Concentrated flows of stormwater in conveyances such as rills,rivulets or channels that have not been filtered, settled,or similarly treated prior to discharge,or evidence thereof; — Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; — Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance,or inadequate design are considered unprotected; — Sediment deposition on any property(including public and private streets)outside of the construction activity covered by this general permit; — Required stabilization has not been initiated or completed on portions of the site; — Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; — Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and — Land disturbance outside of the approved area to be disturbed Pollutant generating activities from PPP: implementation, maintenance, and effectiveness Pollutant generating activities not identified in PPP 1 1 Free State SWPPP Inspection Log Inspection: Last Rainfall: Date Time Date Rainfall Amount No Summary(requirements on back of sheet): r• Locations of: • Prohibited discharges • Controls needing maintenance • Failed controls: r • Evidence that ESCP has not been properly implemented: r. • Additional measures needed: Corrective actions required: Unimplemented corrective actions from previous inspection: WI .r• r•• Inspector Signature Date Operator Signature Date r• 1 Inspections shall be completed at least once everyfour business days; or at least once every 5 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days,the inspection shall be 1 conducted on the next business day. Inspection requirements: Describe discharges at time of inspection Record land-disturbing activities outside approved ESCP Inspect proper installation, maintenance needs, and effectiveness of: — Perimeter controls,such as silt fence — Soil stockpiles and borrow areas — Completed earthen structures(dams,dikes,ditches,diversions,etc.) — Cut and fill slopes — Sediment basins and traps,sediment barriers,etc. — Channels,flumes,slope drains, etc. — Operational storm inlets — Construction vehicle access routes Areas at final grade or to remain dormant for more than 14 days: — Initiate stabilization activities — Complete stabilization activities within 7 days of stopping work Evidence that ESCP has not been properly implemented: — Concentrated flows of stormwater in conveyances such as rills,rivulets or channels that have not been filtered, settled,or similarly treated prior to discharge, or evidence thereof; — Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; — Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that 1 discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance, or inadequate design are considered unprotected; — Sediment deposition on any property(including public and private streets)outside of the construction activity covered by this general permit; — Required stabilization has not been initiated or completed on portions of the site; — Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; — Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and — Land disturbance outside of the approved area to be disturbed Pollutant generating activities from PPP: implementation, maintenance,and effectiveness Pollutant generating activities not identified in PPP 1 I Free State SWPPP Inspection Log Inspection: Last Rainfall: stir Date Time Date Rainfall Amount ✓ Summary(requirements on back of sheet): a.r Locations of: • Prohibited discharges ✓r • Controls needing maintenance • Failed controls: • Evidence that ESCP has not been properly implemented: rr +• • Additional measures needed: Corrective actions required: Unimplemented corrective actions from previous inspection: ✓ ✓r IMOInspector Signature Date Operator Signature Date rr MID 1 Inspections shall be completed at least once everyfour business days;or at least once every5 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days,the inspection shall be conducted on the next business day. Inspection requirements: Describe discharges at time of inspection Record land-disturbing activities outside approved ESCP Inspect proper installation, maintenance needs, and effectiveness of: — Perimeter controls,such as silt fence — Soil stockpiles and borrow areas — Completed earthen structures(dams,dikes, ditches, diversions,etc.) — Cut and fill slopes — Sediment basins and traps,sediment barriers, etc. — Channels,flumes,slope drains,etc. — Operational storm inlets — Construction vehicle access routes Areas at final grade or to remain dormant for more than 14 days: — Initiate stabilization activities — Complete stabilization activities within 7 days of stopping work Evidence that ESCP has not been properly implemented: — Concentrated flows of stormwater in conveyances such as rills,rivulets or channels that have not been filtered, settled,or similarly treated prior to discharge,or evidence thereof; — Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; — Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance,or inadequate design are considered unprotected; — Sediment deposition on any property(including public and private streets)outside of the construction activity covered by this general permit; — Required stabilization has not been initiated or completed on portions of the site; — Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; — Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and — Land disturbance outside of the approved area to be disturbed Pollutant generating activities from PPP: implementation, maintenance, and effectiveness Pollutant generating activities not identified in PPP 1 1 Free State SWPPP Inspection Log Inspection: Last Rainfall: Date Time Date Rainfall Amount Summary(requirements on back of sheet): Locations of: • Prohibited discharges • Controls needing maintenance • Failed controls: • Evidence that ESCP has not been properly implemented: • Additional measures needed: Corrective actions required: Unimplemented corrective actions from previous inspection: rr rr. Inspector Signature Date Operator Signature Date rr 1 Inspections shall be completed at least once everyfour business days;or at least once every5 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days,the inspection shall be conducted on the next business day. Inspection requirements: Describe discharges at time of inspection Record land-disturbing activities outside approved ESCP Inspect proper installation, maintenance needs, and effectiveness of: — Perimeter controls,such as silt fence — Soil stockpiles and borrow areas — Completed earthen structures(dams,dikes,ditches,diversions,etc.) — Cut and fill slopes — Sediment basins and traps, sediment barriers, etc. — Channels,flumes,slope drains, etc. — Operational storm inlets — Construction vehicle access routes Areas at final grade or to remain dormant for more than 14 days: — Initiate stabilization activities — Complete stabilization activities within 7 days of stopping work Evidence that ESCP has not been properly implemented: — Concentrated flows of stormwater in conveyances such as rills,rivulets or channels that have not been filtered, settled,or similarly treated prior to discharge, or evidence thereof; — Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; — Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance,or inadequate design are considered unprotected; — Sediment deposition on any property(including public and private streets)outside of the construction activity covered by this general permit; — Required stabilization has not been initiated or completed on portions of the site; — Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; — Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and — Land disturbance outside of the approved area to be disturbed Pollutant generating activities from PPP: implementation, maintenance,and effectiveness Pollutant generating activities not identified in PPP 1 1 •• Free State SWPPP Inspection Log Inspection: Last Rainfall: Date Time Date Rainfall Amount Summary(requirements on back of sheet): Locations of: • Prohibited discharges • Controls needing maintenance err • Failed controls: err • Evidence that ESCP has not been properly implemented: rrr • Additional measures needed: Corrective actions required: +r Unimplemented corrective actions from previous inspection: ari r.r Inspector Signature Date Operator Signature Date .7; rr . 1 Inspections shall be completed at least once every four business days;or at least once every 5 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted on the next business day. Inspection requirements: Describe discharges at time of inspection Record land-disturbing activities outside approved ESCP Inspect proper installation, maintenance needs, and effectiveness of: — Perimeter controls, such as silt fence — Soil stockpiles and borrow areas — Completed earthen structures(dams, dikes, ditches,diversions, etc.) — Cut and fill slopes — Sediment basins and traps,sediment barriers,etc. — Channels,flumes,slope drains, etc. — Operational storm inlets — Construction vehicle access routes Areas at final grade or to remain dormant for more than 14 days: — Initiate stabilization activities — Complete stabilization activities within 7 days of stopping work Evidence that ESCP has not been properly implemented: — Concentrated flows of stormwater in conveyances such as rills,rivulets or channels that have not been filtered,settled,or similarly treated prior to discharge,or evidence thereof; — Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; — Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance, or inadequate design are considered unprotected; — Sediment deposition on any property(including public and private streets)outside of the construction activity covered by this general permit; — Required stabilization has not been initiated or completed on portions of the site; — Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; — Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and — Land disturbance outside of the approved area to be disturbed Pollutant generating activities from PPP: implementation, maintenance,and effectiveness Pollutant generating activities not identified in PPP RECEIVED 0EC292015 /ELOPMENT