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HomeMy WebLinkAboutWPO201100042 Calculations 2011-07-06 STORM WATER MANAGEMENT REPORT CROWN BMW RETAIL PARTS & SERVICE BUILDING CHARLOTTESVILLE, VA •- PREPARED FOR Asbury Automotive North Carolina, LLC 2905 Premier Parkway, Suite 300 Duluth, GA 30097 (770) 418- ,343_ mar k m 15 ARLES A. GARCIA y< No. 36014 �1A 2 "a i jO/�NP.L 1®00(0 y♦''?4'j vow PREPARED BY Freeland and Kauffman, Inc. 209 West Stone Avenue Greenville, South Carolina 29609 (864) 233-5497 (864) 233-8915 fax June 29, 201 1 r• INDEX 1 . STORM WATER MANAGEMENT NARRATIVE 2. EROSION & SEDIMENT CONTROL NARRATIVE 3. SUMMARY 4. TR-55 (PRE-DEV) CALCULATIONS & PRE-DEVELOPED FLOW CALCULATIONS 5. TR-55 (POST-DEV) CALCULATIONS & POST-DEVELOPED FLOW CALCULATIONS 6. STAGE-STORAGE-DISCHARGE COMPUTATION AND POND ROUTING 7. REMOVAL RATE CALCULATIONS 8. FILTERRA DETAILS 9. CATCH BASIN STORMFILTER DETAILS 10. STORM DRAIN COMPUTATIONS 11 . EXISTING 36" STORM DRAIN PIPE ANALYSIS 12. BASIN #1 DESIGN COMPUTATIONS 13. 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Zvi/r"" `e/•"9e _ 00 p, ce `'' '- 1 l 't• ,� -.._ ��� • ' _-.� + = f 'ice' _ J 3-1)TopoQuads Copyright G 1999 DeLorme Yarmouth,ME 04096 Source Data:USGS I - 50 ft Scale:1:12,000 Detail:13-3 Datum:WGS84 .r ar AMY 1 STORM WATER MANAGEMENT NARRATIVE FOR CROWN BMW RETAIL PARTS & SERVICE BUILDING Project Description: The site is located at the intersection of Richmond Road (Route 250) and People's Place in Albemarle County, Virginia. The proposed development consists of construction of+1- 1 4,269 sf Crown BMW retail parts and service building involving construction of parking lot, driveways, storm drain, underground detention system and other utilities. Existing Conditions: At present almost the entire site drains to existing inlet located at the south-east side of the project. There is a gravel area located on north side and rest of the site is grassed-wooded. Proposed Conditions: With the new development, a new underground detention pond will be constructed to provide required quantity control and five Filterra units, two Catch basin Stormfilters and one manhole stormfilter will be provided for required quality control. Quantity Control: For Pre-developed condition, as required by Albemarle County entire site has been assumed well forested (CN=51). For Post-developed condition, underground detention system has been proposed to •� control 1 .5, 2 and 10 yr storm. The underground detention system consists of(3) 10" dia CMP pipes which is designed by Contech. A weir plat has been provided to control 1.5, 2 ,�.. and 10 yr post developed flow so that it is less than or equal to pre developed flow. Quality Control: To provide quality control for this site, 5 Filterra units, 2 catchbasin stormfilters and 1 manhole stormfilter have been provided. Refer to Section 8 & 9 for Filterra and Stormfilter details. Refer to Section 7 for removal rate calculations as required by Albemarle County. 2 Var EROSION AND SEDIMENT CONTROL NARRATIVE FOR CROWN BMW RETAIL PARTS & SERVICE BUILDING PROJECT DESCRIPTION: The project consists of construction of 14,269 square feet Crown BMW retail parts and service building .w involving construction of parking lot,driveways, landscape areas, storm drain and other utilities. EXISTING SITE CONDITIONS: In existing condition the site is undeveloped.The northern half portion of the site consists asphalt and ... gravel area and southern half portion of the site is wooded. ADJACENT AREAS: The site is located at the intersection of Richmond Road(Route 250)and People's Place.The site is A. bounded to the east by an existing BMW dealership building ,Albemarle County Service Authority building on south side, Richmond Ave(Route 250)is on North side and People's Place is on west side. OFF-SITE AREAS: The off-site disturbed area includes construction of right turn lane along Route 250, replacement of VIP existing 36" CPP storm drain pipe with RCP and proposed sanitary sewer tie in to existing manhole. Contractor shall specify location of borrow site at the pre construction meeting.Approved borrow site shall have erosion control measures. SOILS: ,e, The soils present on the site are: 23B-Davidson clay loam, 2 to 7 percent slopes 'r 71D - Rabun clay loam, 15 to 25 percent slopes �► 88-Udorthents, loamy. ler CRITICAL AREAS: 'r" There are steep slopes present on the site as shown on Phase I plan.Also, steep slopes are present on the �• service authority property located at south-east side EROSION AND SEDIMENT CONTROL MEASURES: Unless otherwise indicated,all vegetative and structural erosion control practices shall be maintained and constructed according to minimum standards and specifications of the 1992 Virginia erosion and sediment control handbook.The minimum standard of the VESCH shall be adhered to unless otherwise waived or approved by a variance. ANY •p STRUCTURAL PRACTICES: Temporary Construction Entrance A temporary construction entrance with wash rack shall be installed as shown on the " plans. Construction vehicles will be required to wash their wheels before exiting onto mor Route 250&People's Place. r.. Storm drain Inlet Protection 400, Inlet protection shall be installed as shown on the Phase I, Phase II and Phase III plans. Temporary Diversion Dike A temporary diversion dike shall be installed as shown on Phase I and Phase II plan. Aur, Silt Fence Temporary silt fence shall be installed as shown on Phase I, Phase II and Phase III l" plan. Air Temporary Sediment Basin vs, 1 Temporary sediment basin shall be installed as shown on the Phase I and Phase II plans and per the Sediment Basin details provided on Phase I and Phase II plans. �.. PERMANENT STABILIZATION: All areas disturbed by construction shall be stabilized with Permanent seeding immediately following finish grading. Seeding shall be done according to Standard and Specification 3.32 "Permanent Seeding" of the Handbook. STORMWATER RUNOFF CONSIDERATIONS: One Underground Detention facility has been provided to control stormwater runoff. Stormwater from the underground detention facility will be discharged to 36" RCP which will ultimately discharge to Rivanna River. CALCULATIONS: ""' Refer to Stormwater management report for calculations. r INV gay IMP Vs, 3 DISCHARGE-SUMMARY SITE CONDITION D.A. RCN Tc DISCHARGE (CFS) (AC.) (Hr.) 1.5-YR 2-YR 10-YR PRE-DEV Study Point 2.26 51 0.1 0.3 0.38 3.08 �► STUDY POINT SITE CONDITION D.A. RCN Tc DISCHARGE (CFS) (AC.) (Hr.) 1.5-YR 2-YR 10-YR POST-DEV D.A. to 2.26 96 0.1 9.76 10.04 15.49 Underground Detention System Discharge from - - - 0.54 0.54 0.74 Underground Detention INF System =ftr UNDERGROUND POND SUMMARY Top of Dam Elev. Water Surface Elev. 1.5-YR 2-YR 10-YR Underground 373.0 368.47 368.63 372.27 Detention System 1.5, 2 &10 -Yr attenuations have been provided. S Hydrograph Summary Report 41, Hyd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph - No. type flow interval peak hyd(s) elevation storage description 411V (origin) (cis) (min) (min) (cult) (ft) (cuft) 1u1, 1 SCS Runoff 0.30 3 723 1,908 --- ----- Pre-Developed Flow +u1, 2 SCS Runoff 9.76 3 717 24,182 --- Post-Developed Flow 3 Reservoir 0.54 3 774 24,173 2 368.47 12,409 Pond Routing w1. 11. 1111. 1rr 1111. AMY 1,1. a1. rir IMP 11. 1,1. a1. 1111, 1v1, IOW +u1. 91. .1.r 11. 11.. 1111. 1tr are i1, FINAL POND (11-4-08).gpw Return Period:XYear Tuesday, Nov 4 2008, 11:53 AM .. �'5 Hydraflow Hydrographs by Intelisolve 11.. 4V 2 Hydrograph Summary Report Hyd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph 'r' No. type flow interval peak hyd(s) elevation storage description (origin) (cis) (min) (min) (cuft) (ft) (cuft) low 'ar 1 SCS Runoff 0.38 3 723 2,128 Pre-Developed Flow 111` 2 SCS Runoff 10.04 3 717 24,942 ---- Post-Developed Flow 4,r 3 Reservoir 0.54 3 774 24,934 2 368.63 12,848 Pond Routing 4r ler 4r 4r 4r ar 4Y VIP +rr 41110, .rr 4r 4r 4r 4r 4r 4/ 4r 40. WW 4r 4111, 4r • 4r FINAL POND (11-4-08).gpw Return Period: 2 Year Tuesday, Nov 4 2008, 11:53 AM w Hydraflow Hydrographs by Intelisolve 4W 3 1.11, Hydrograph Summary Report Hyd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph No. type flow interval peak hyd(s) elevation storage description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) err 1 SCS Runoff 3.08 3 720 7,829 ---- ---- Pre-Developed Flow „r 2 SCS Runoff 15.49 3 717 39,449 ---- --- Post-Developed Flow 3 Reservoir 0.74 3 783 39,441 2 372.27 21,397 Pond Routing .r .r rw wr eir ww +rr ww w ver ler *r SOP ww +r� .w -or .,. FINAL POND (11-4-08).gpw Return Period: 10 Year Tuesday, Nov 4 2008, 11:53 AM Hydraflow Hydrographs by Intelisolve w► 4 ®w. AW AW AK BMW SERVICE CENTER PRE-DEVELOPED Albemarle County, Virginia Sub-Area Time of Concentration Details +i +�w Sub-Area Flow Mannings's End Wetted Travel Identifier/ Length Slope n Area Perimeter Velocity Time (ft) (ft/ft) (sq ft) (ft) (ft/sec) (hr) err PRE-DEVEL SHEET 62 0.0160 0.011 0.013 am SHALLOW 95 0.3580 0.050 0.003 SHALLOW 103 0.0150 0.050 0.014 i CHANNEL 117 3.000 0.011 Time of Concentration 0.100 +rr mw yr AW W. Note AW Recmye4 0.k3 MbexYiai\C., CDu\-N AW MI he(9) been assn $ed folres+68- (c N = GI) MI AW AW A AW W wn WinTR-55, Version 1.00.00 Page 1 9/10/2008 2:03:45 PM mv mw wr ar Hydrograph Plot ,r„ Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:37 PM Hyd. No. 1 Pre-Developed Flow Hydrograph type = SCS Runoff Peak discharge = 0.30 cfs ... Storm frequency = Time interval = 3 min Drainage area = 2.26 ac Curve number = 51 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 6 min Total precip. = 3.60 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Hydrograph Volume=1,908 cult wn Air var Pre-Developed Flow Q(cfs) Hyd. No. 1 --)(Yr Q(cfs) 0.50 ‘•5 - 0.50 0.45 - - 0A5 0.40 - 0.40 0.35 0.35 +• 0.30 I+ 0.30 vs, 0.25 0.25 • 0.20 0.20 • 0.15 0.15 kir e.r 0.10 0.10 0.05 — 0.05 0.00 - 1 0.00 0 3 5 8 10 13 15 18 20 23 25 Time(hrs) Hyd No. 1 • Hydrograph Plot Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:38 PM Hyd. No. 1 Pre-Developed Flow Hydrograph type = SCS Runoff Peak discharge = 0.38 cfs Storm frequency = 2 yrs Time interval = 3 min Drainage area = 2.26 ac Curve number = 51 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 6 min Total precip. = 3.70 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Air Hydrograph Volume=2,128 cult e+w Pre-Developed Flow Q(cfs) Q(cfs) Hyd. No. 1 --2 Yr 0.50 0.50 .r 0.45 - 0.45 0.40 - 0.40 •` 0.35 0.35 Asr .r 0.30 - 0.30 0.25 - 0.25 0.20 0.20 �• 0.15 0.15 mr• 0.10 ' 0.10 0.05 0.05 0.00 0.00 0 3 5 8 10 13 15 18 20 23 25 w Hyd No. 1 Time(hrs) vw Hydrograph Plot Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:38 PM ver Hyd. No. 1 Pre-Developed Flow ■ Hydrograph type = SCS Runoff Peak discharge = 3.08 cfs Storm frequency = 10 yrs Time interval = 3 min Drainage area = 2.26 ac Curve number = 51 Basin Slope = 0.0 % Hydraulic length = 0 ft ,., Tc method = USER Time of conc. (Tc) = 6 min Total precip. = 5.60 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 rr Hydrograph Volume=7,829 cuft +In Pre-Developed Flow .. Q(cfs) Hyd. No. 1 -- 10 Yr Q (cfs) 4.00 - - 4.00 Air .r 3.00 3.00 rr 2.00 2.00 1.00 1.00 Ayr rr 0.00 - ` 0.00 0 3 5 8 10 13 15 18 20 23 25 «r Hyd No. 1 Time(hrs) 5 mer Amp my AK BMW SERVICE CENTER mme POST-DEVELOPED Albemarle County, Virginia tir Sub-Area Land Use and Curve Number Details +r ,W Sub-Area Hydrologic Sub-Area Curve Identifier Land Use Soil Area Number VW Group (ac) MW POST-DEVELOpen space; grass cover 50% to 75% (fair) B .1 69 Open space; grass cover 50% to 75% (fair) D .1 84 VW Paved parking lots, roofs, driveways B 1.15 98 Paved parking lots, roofs, driveways D .91 98 Total Area / Weighted Curve Number 2.26 96 my my, gr Amp .w+ Alp VW ar ®rr +w+ VW MW MW VW VW VW MW VW MW MI VW VW 7r ,r, WinTR-55, Version 1.00.00 Page 1 11/10/2008 4:45:15 PM VW VI MI VW mw VW VW low AK BMW SERVICE CENTER 'ow POST-DEVELOPED Albemarle County, Virginia mow Sub-Area Time of Concentration Details mow yr Sub-Area Flow Mannings's End Wetted Travel Identifier/ Length Slope n Area Perimeter Velocity Time row (ft) (ft/ft) (sq ft) (ft) (ft/sec) (hr) ,r POST-DEVEL SHEET 47 0.0250 0.011 0.009 ,00r SHALLOW 120 0.0330 0.025 0.009 CHANNEL 410 VW Time of Concentration 0.100 +®r VW VW VW VW VW VW VW ar VW VW VW err► VW VW VW VW Aro yr VW VW VW VW VW WinTR-55, Version 1.00.00 Page 1 9/10/2008 2.01.22 PM vs, vow vow r.. Virir Vir Hydrograph Plot Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:43 PM Hyd. No. 2 �► Post-Developed Flow Hydrograph type = SCS Runoff Peak discharge = 9.76 cfs -S Storm frequency yrs Time interval = 3 min Drainage area = 2.26 ac Curve number = 96 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 6 min Total precip. = 3.60 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 -- Hydrograph Volume=24,182 cuft yr Post-Developed Flow Q(cfs) Hyd. No. 2 -- CYr Q(cfs) 10.00 'S 10.00 ..r 8.00 8.00 vo, 6.00 6.00 4.00 - - 4.00 2.00 - 2.00 0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 Hyd No. 2 Time(hrs) Hydrograph Plot lerr Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:44 PM Hyd. No. 2 Post-Developed Flow Hydrograph type = SCS Runoff Peak discharge = 10.04 cfs Storm frequency = 2 yrs Time interval = 3 min Drainage area = 2.26 ac Curve number = 96 Basin Slope = 0.0 % Hydraulic length = 0 ft �,. Tc method = USER Time of conc. (Tc) = 6 min Total precip. = 3.70 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 „r,,, Hydrograph Volume=24,942 cult vow nr. Post-Developed Flow Ai, Q(cfs) Hyd. No. 2 --2 Yr Q (cfs) 12.00 - 12.00 10.00 10.00 8.00 8.00 6.00 - 6.00 4.00 - 4.00 2.00 - 2.00 0.00 - 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 Hyd No.2 Time(hrs) i. Hydrograph Plot Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:44 PM mar .�, Hyd. No. 2 Post-Developed Flow Hydrograph type = SCS Runoff Peak discharge = 15.49 cfs Storm frequency = 10 yrs Time interval = 3 min Drainage area = 2.26 ac Curve number = 96 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 6 min Total precip. = 5.60 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Hydrograph Volume=39,449 cuft +ar Post-Developed Flow Q(cfs) Hyd. No. 2-- 10 Yr Q(cfs) 18.00 - 18.00 15.00 I 15.00 Air 12.00 12.00 9.00 9.00 6.00 6.00 `s, 3.00 3.00 0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 Hyd No. 2 Time(hrs) 6 lor • 47dap ank�ay3 4a rWx y" Gsi , + - ,. � i j'' ! car '"3 -..,. rvf r°K s ti e` .. ,yav "e. ! 41 'U.Iw & '.i , :, .+.,t 'r: a,�'!/� r.✓,, i "N v.2 n a wY. r'J4is �• ` �,i s\ `C!f ., 0 1'� ads b :on4 wrb f�+:.,i av aS,s��, ;:„1, �r ),, ,F•1slM ✓"+Sze. g S..``x i ikt.: yi sou - '6Y Jy �^' v [ , ,ybf�ar"ff"f ?.4✓r s i a. }!• .r� Q ry aM "5, ","f,4.4,. 3i,i,,,+'ytrc ,i: -- 7N ;1; ....-GIG ....,4,,,,:,,,-,,,,,,,:+j 0,aTtiatr..»lEfri-Ya . . i S � Z. ilili 3, j c ^-rT c t0 t^� D tr0�Y N : iii fi ill:::;:i :'''''' v~ IDrm m ',m m m.m CO m V. rn o vA O{ O O 6•' c € o „',r'.Nr. .•� w N C U" in cr • N w Q ' CO . 61 4 co W 3 O uh,-o a ._ m - 0 3*E C 11111 N y V• Z U a . d C w ' ; : O C FIFO c am lit!-,', 'u3 IZ nI II ° r te co a ' NV O - N CU A ? 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Pond Report WV Hydraflow Hydrographs by Intelisolve Tuesday,Nov 4 2008, 11:55 AM , Pond No. 1 - Underground storage Pond Data 90.0 VW Pipe dia. = 10.00 ft Pipe length = 340 ft No. Barrels = 3.0 Slope = 0.00% Invert elev. = 363.00 ft Stage/Storage Table WI Stage(ft) Elevation(ft) Contour area(sqft) Incr.Storage(cuft) Total storage(cuft) wir 0.00 363.00 00 0 0 ft. 0.50 363.50 00 415 415 1.00 364.00 00 738 1,153 1.50 364.50 00 932 2,084 V"r 2.00 365.00 00 1,072 3,156 2.50 365.50 00 1,178 4,334 r "r' 3.00 366.00 00 1,258 5,592 3.50 366.50 00 1,323 6,915 "r' 4.00 367.00 00 1,360 8,275 4.50 367.50 00 1,398 9,673 - 5.00 368.00 00 1,406 11,079 5.50 368.50 00 1,405 12,484 arr. 6.00 369.00 00 1,398 13,882 6.50 369.50 00 1,367 15,249 is, 7.00 370.00 00 1,316 16,565 7.50 370.50 00 1,257 17,822 ,m„ 8.00 371.00 00 1,178 19,000 8.50 371.50 00 1,071 20,071 9.00 372.00 00 931 21,001 9.50 372.50 00 738 21,739 , 10.00 373.00 00 413 22,153 VIP Culvert/Orifice Structures Weir Structures lw [A] [B] [C] [D] [A] [B] [C] [D] ,,I, Rise(in) = 15.00 3.00 0.00 0.00 Crest Len(ft) = 6.60 0.00 0.00 0.00 Span(in) = 15.00 3.00 0.00 0.00 Crest El.(ft) = 372.27 0.00 0.00 0.00 .arr No.Barrels = 1 1 0 0 Weir Coeff. = 3.33 3.33 0.00 0.00 Invert El.(ft) = 363.00 363.00 0.00 0.00 Weir Type = Rect -- -- --- "r` Length(ft) = 29.00 0.00 0.00 0.00 Multi-Stage = Yes No No No Slope(%) = 2.20 0.00 0.00 0.00 vw N-Value = .013 .013 .000 .000 vs. Orif.Coeff. = 0.60 0.60 0.00 0.00 Multi-Stage = n/a Yes No No Exfiltration= 0.000 in/hr(Wet area) Tailwater Elev.= 0.00 ft Aar Note:Culvert/Orifice outflows have been analyzed under inlet and outlet control "' Stage/Storage/Discharge Table VI Stage Storage Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D E> l Total ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs m■ 0.00 0 363.00 0.00 0.00 --- --- 0.00 --- --- -- --- 0.00 0.50 415 363.50 0.14 0.14 - 0.00 - -- 0.14 1.00 1,153 364.00 0.21 0.21 --- --- 0.00 - -- -- --- 0.21 1.50 2,084 364.50 0.27 0.27 --- --- 0.00 -- -- -- -- 0.27 - 2.00 3,156 365.00 0.31 0.31 --- --- 0.00 --- -- --- -- 0.31 2.50 4,334 365.50 0.35 0.35 -- -- 0.00 -- --- --- --- 0.35 "" 3.00 5,592 366.00 0.39 0.39 --- -- 0.00 --- --- --- --- 0.39 3.50 6,915 366.50 0.43 0.42 --- - 0.00 --- --- --- -- 0.42 '. 4.00 8,275 367.00 0.46 0.45 - -- 0.00 -- --- --- - 0.45 4.50 9,673 367.50 0.48 0.48 -- -- 0.00 - -- -- -- 0.48 /r 5.00 11,079 368.00 0.51 0.51 -- --- 0.00 --- --- --- -- 0.51 5.50 12,484 368.50 0.54 0.54 --- --- 0.00 --- - --- --- 0.54 a. 6.00 13,882 369.00 0.56 0.56 -- --- 0.00 -- - -- --- 0.56 6.50 15,249 369.50 0.59 0.59 -- -- 0.00 --- -- --- --- 0.59 .rr 7.00 16,565 370.00 0.61 0.61 -- - 0.00 --- --- -- --- 0.61 7.50 17,822 370.50 0.64 0.63 --- -- 0.00 --- --- --- --- 0.63 VP, 8.00 19,000 371.00 0.67 0.65 -- -- 0.00 - --- --- --- 0.65 8.50 20,071 371.50 0.67 0.67 -- -- 0.00 - -- -- --- 0.67 9.00 21,001 372.00 0.70 0.69 --- --- 0.00 - --- -- --- 0.69 9.50 21,739 372.50 3.13 0.69 -- --- 2.42 - - - -- 3.12 10.00 22,153 373.00 14.16 0.45 -- -- 13.71 -- - -- -- 14.16 s` ar Hydrograph Plot r Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:47 PM Hyd. No. 3 Pond Routing Hydrograph type = Steservoir Peak discharge = 0.54 cfs Storm frequency yrs Time interval = 3 min Inflow hyd. No. = 2 Max. Elevation = 368.47 ft Reservoir name = Underground storage Max. Storage = 12,409 cuft Storage Indication method used. Hydrograph Volume=24,173 cuft Air a.. Air Pond Routing �.. Q (cfs) Hyd. No. 3--;1,Yr Q (cfs) 10.00 - 1'S - 10.00 8.00 - 8.00 6.00 - 6.00 4 4.00 - 4.00 vr- w �x 2.00 2.00 0.00 0.00 0 3 6 9 12 15 18 21 24 27 30 Time(hrs) .., Hyd No. 3 Hyd No. 2 1111111111 Req. Stor= 12,409 cuft ar Ayr Wr Hydrograph Plot Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:48 PM ler �,. Hyd. No. 3 �., Pond Routing Hydrograph type = Reservoir Peak discharge = 0.54 cfs Storm frequency 1=5tyrs Time interval = 3 min Inflow hyd. No. = 2 Max. Elevation = 368.47 ft Reservoir name = Underground storage Max. Storage = 12,409 cuft Storage Indication method used. Hydrograph Volume=24,173 cuft yr, vow wr w Pond Routing ,,, Elev(ft) Hyd. No. 3 --1--Yr Elev(ft) • �► 370.00 S - 370.00 1. 369.00 369.00 368.00 368.00 1" 367.00 367.00 Alr 366.00 366.00 Y.. 365.00 365.00 364.00 364.00 363.00 363.00 0 3 6 9 12 15 18 21 24 27 30 1. Underground storage Time(hrs) or Hydrograph Plot moo Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:48 PM irrr `., Hyd. No. 3 �.. Pond Routing Hydrograph type = Reservoir Peak discharge = 0.54 cfs Storm frequency = 2 yrs Time interval = 3 min Inflow hyd. No. = 2 Max. Elevation = 368.63 ft Reservoir name = Underground storage Max. Storage = 12,848 cuft Storage Indication method used. Hydrograph Volume=24,934 cuft wer wr vor rrr Pond Routing Q (cfs) Hyd. No. 3--2 Yr Q(cfs) 12.00 12.00 v.. 10.00 10.00 r .r 8.00 8.00 6.00 6.00 AY 4.00 4.00 +fir �r z. 'r 2.00 - 2.00 yaw „■, 0.00 0.00 0 3 6 9 12 15 18 21 24 27 30 Time(hrs) 411, Hyd No. 3 Hyd No. 2 11/1111111 Req. Stor= 12,848 cuft y.. Hydrograph Plot Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:48 PM Hyd. No. 3 Pond Routing Hydrograph type = Reservoir Peak discharge = 0.54 cfs Storm frequency = 2 yrs Time interval = 3 min Inflow hyd. No. = 2 Max. Elevation = 368.63 ft Reservoir name = Underground storage Max. Storage = 12,848 cuft Storage Indication method used. Hydrograph Volume=24,934 cuft low Wr1 4r. rir war Pond Routing 8181► Elev(ft) Elev(ft) Hyd. No. 3--2 Yr '81' 370.00 370.00 As. mir 369.00 369.00 4r' 368.00 368.00 367.00 367.00 r 366.00 366.00 365.00 365.00 yr 4811 364.00 364.00 Air 363.00 363.00 0 3 6 9 12 15 18 21 24 27 30 Time(hrs) 4811 1. Underground storage AISIP w1 q.r Hydrograph Plot Hydraflow Hydrographs by Intelisolve Monday, Nov 10 2008,4:49 PM °or Hyd. No. 3 - Pond Routing .. Hydrograph type = Reservoir Peak discharge = 0.74 cfs Storm frequency = 10 yrs Time interval = 3 min Inflow hyd. No. = 2 Max. Elevation = 372.27 ft Reservoir name = Underground storage Max. Storage = 21,397 cuft Storage Indication method used. Hydrograph Volume=39,441 cuft rr Air Pond Routing Q(cfs) Hyd. No. 3-- 10 Yr Q(cfs) mip 18.00 - - 18.00 - �,,, 15.00 15.00 it wr 12.00 12.00 gar 9.00 9.00 6.00 6.00 'i• 3.00 - 3.00 .r 0.00 — — 0.00 0 4 7 11 14 18 21 25 28 32 35 Time(hrs) qw, Hyd No. 3 Hyd No. 2 1111111111 Req. Stor=21,397 cuft vir .r. ,.o .r Hydrograph Plot Hydraflow Hydrographs by Intelisolve Monday,Nov 10 2008,4:49 PM war v„ Hyd. No. 3 Pond Routing v. Hydrograph type = Reservoir Peak discharge = 0.74 cfs Storm frequency = 10 yrs Time interval = 3 min Inflow hyd. No. = 2 Max. Elevation = 372.27 ft Reservoir name = Underground storage Max. Storage = 21,397 cuft Storage Indication method used. Hydrograph Volume=39,441 cuft wr +rr .r. srr Pond Routing Elev ft ( Elev(ft) Hyd. No. 3-- 10 Yr 375.00 375.00 ver r, 373.00 373.00 371.00 371.00 369.00 369.00 367.00 367.00 ..r ,.. 365.00 365.00 W 1110' 363.00 363.00 0 4 7 11 14 18 21 25 28 32 35 1. Underground storage Vie Time (hrs) wr 7 BMW Retail Parts & Service Building (Charlottesville, VA) Removal rate computations for Catch basin Stormfilters: Total drainage area to Catch basin Stormfilters = 0.87 AC In, Pre-developed Condition, impervious area is 0.25 AC Ipre = 0.25 / 0.87 = 0.287 = 28.7% Lpre = 8.77 x (0.05+ 0.9x Ipre) x Cw x A = 8.77 x (0.05 + 0.9 x 28.7) x 0.7 x 0.87 = 138.22 In post-developed condition, impervious area is 0.8 AC Ipost = 0.8 / 0.87 = 0.919 = 91 .9% Lpost = 8.77 x (0.05+ 0.9x Ipost) x Cw x A = 8.77 x (0.05 + 0.9 x 91 .9) x 0.7 x0.87 = 442.0 RR = (Lpost — f x Lpre) x 100 / Lpost = (442 — 0.9 X 138.22) x 100 / 442 = 71 .86 (Since Ipre is greater than 20%, f value has taken as 0.9) BMW Retail Parts & Service Building (Charlottesville, VA) Removal rate computations for Filterra: Total Drainage area to Filterra = 1 .03 AC In, Pre-developed Condition, impervious area is 0.23 AC Ipre = 0.23/ 1 .03 = 0.223 = 22.3% • Lpre = 8.77 x (0.05+ 0.9x Ipre) x Cw x A = 8.77 x (0.05 + 0.9 x 22.3) x 0.7 x 1 .03 = 127.2 In post-developed condition, impervious area is 0.92 AC Ipost = 0.92 / 1 .03 = 0.893 = 89.3% Lpost = 8.77 x (0.05+ 0.9x Ipost) x Cw x A = 8.77 x (0.05 + 0.9 x 89.3) x 0.7 x 1 .03 �. = 508.5 RR = (Lpost - f x Lpre) x 100 / Lpost = (508.5 - 0.9 X 127.2) x 100 / 508.5 = 77.5 (Since Ipre is greater than 20%, f value has taken as 0.9) 8 War 64) it filterra ® Filterra® Overview Bioretention Systems Stormwater Bioretention Filtration System Save valuable space with small footprint $16 for urban sites -4 -,. Improve BMP aesthetics with attractive trees or shrubs Aorip- Reduce lifetime cost with safer and less - expensive maintenance `'°` Remove Pollutants and Comply with NPDES Filterra®is well-suited for the ultra-urban environment with high removal efficiencies for many "` pollutants such as petroleum,heavy metals,phosphorus,nitrogen,TSS and bacteria. Filterra®is similar .,,► in concept to bioretention in its function and applications,with the major distinction that Filterra®has been optimized for high volume/flow treatment and high pollutant removal. It takes up little space (often 0.33%Filter Surface Area/Drainage Area)and may be used on highly developed sites such as �.► landscaped areas,green space,parking lots and streetscapes. Filterra®is exceedingly adaptable and is the urban solution for Low Impact Development. °•' Stormwater flows through a specially designed filter media mixture contained in a landscaped concrete �, container. The filter media captures and immobilizes pollutants;those pollutants are then decomposed, volatilized and incorporated into the biomass of the Filterra®system's micro/macro fauna and flora. Stormwater runoff flows through the media and into an underdrain system at the bottom of the container, ANY where the treated water is discharged.Higher flows bypass the Filterra®via a downstream inlet structure, curb cut or other appropriate relief. V.. Expected Average Pollutant Removal Rates (Ranges Varying with Particle Size.Pollutant Loading and Site Conditions) �,. TSS Removal 85% Phosphorous Removal 73% Nitrogen Removal 43% Heavy Metal Removal 33%- 82% Fecal Coliform 57%- 76% * ,,,, Predicted Oil&Grease >85% * Standard Blend www.filterra.com VA` IMP .„r INV :. terra �r Table 1: Filterra®Quick Sizing Table �• (Mid-Atlantic Region -v03) rr "'` Available Filterra®Box Sizes Recommended Commercial Contributing Drainage Area(acres) Outlet Pipe (feet) where C=0.85 4x6 or 6x4 up to 0.20 4"SDR-35 PVC w 4x8 or 8x4 0.20 to 0.26 4"SDR-35 PVC .or Standard 6x6 0.27 to 0.29 4"SDR-35 PVC law 6x8 or 8x6 or 4x12 or 12x4 0.30 to 0.39 4"SDR-35 PVC VIP 6x10 or 10x6 0.40 to 0.49 6"SDR-35 PVC war 6x12 or 12x6 0.50 to 0.59 6"SDR-35 PVC 7x13 or 13x7 0.60 to 0.74 6"SDR-35 PVC Available Filterra®Box Sizes Recommended Residential (feet) Contributing Drainage Area(acres) Outlet Pipe ,,. where C=0.50 .r 4x6 or 6x4 up to 0.33 4"SDR-35 PVC ,,, 4x8 or 8x4 0.34 to 0.45 4"SDR-35 PVC vs, Standard 6x6 0.46 to 0.50 4"SDR-35 PVC 6x8 or 8x6 or 4x12 or 12x4 0.51 to 0.67 4"SDR-35 PVC 6x10 or 10x6 0.68 to 0.83 6"SDR-35 PVC wrr 6x12 or 12x6 0.84 to 1.00 6"SDR-35 PVC 7x13 or 13x7 1.01 to 1.27 6"SDR-35 PVC Air - Notes: <+r 1.All boxes are a standard 3.5 feet depth(INV to TC) 2.A standard SDR-35 PVC pipe coupling is cast into the wall for easy connection to discharge drain mow 3.Dimensions shown are internal.Please add 1'to each for external(using 6"walls) 4. In line with TR55 data,for Commercial Developments a minimum(runoff coefficient)C factor of 0.85 is wr recommended. For Residential Developments,use of C factors less than 0.5 require individual site review by Filterra. "sr 5.Please ask for Sizing Tables for other target treatment goals,e.g.uniform intensity 0.3 in/hr 6.This sizing table is valid for VA(treating 90%of annual runoff)and typical for the Mid-Atlantic region vrr° 10-16-07 wwwflterracom Toll Free:(866)349-3458 wr aar Aar *ar rw IOW terra Bioretention Systems Filterra® Standard Plan Notes MOP Construction & Installation A. Each unit shall be constructed at the locations and elevations according to the sizes shown on the approved drawings.Any modifications to the elevation or location shall be at the direction of and approved by the Engineer. we. B. If the Filterra®is stored before installation,the top slab must be placed on the box using the 2x4 wood provided,to prevent any contamination from the site.All internal fittings supplied(if any), must be left in place as per the delivery. C. The unit shall be placed on a compacted sub-grade with a minimum 6-inch gravel base matching the final grade of the curb line in the area of the unit. The unit is to be placed such that the unit AO, and top slab match the grade of the curb in the area of the unit. Compact undisturbed sub-grade „P► materials to 95%of maximum density at+1-2%of optimum moisture. Unsuitable material below sub-grade shall be replaced to the site engineer's approval. Air D. Outlet connections shall be aligned and sealed to meet the approved drawings with modifications necessary to meet site conditions and local regulations. E. Once the unit is set,the internal wooden forms and protective mesh cover must be left intact. Remove only the temporary wooden shipping blocks between the box and top slab.The top lid should be sealed onto the box section before backfilling,using a non-shrink grout,butyl rubber or similar waterproof seal.The boards on top of the lid and boards sealed in the unit's throat must �., NOT be removed.The Supplier(Americast or its authorized dealer)will remove these sections at the time of activation. Backfilling should be performed in a careful manner, bringing the ap- propriate fill material up in 6"lifts on all sides. Precast sections shall be set in a manner that will w. result in a watertight joint.In all instances, installation of Filterra®unit shall conform to ASTM specification C891 "Standard Practice for Installation of Underground Precast Utility Structures", r unless directed otherwise in contract documents. F. Curb and gutter construction(where present)shall ensure that the flow-line of the Filterra®units is at a greater elevation than the flow-line of the bypass structure or relief(drop inlet,curb cut or v"' similar).Failure to comply with this guideline may cause failure and/or damage to the Filterra® environmental device. G. Each Filterra®unit must receive adequate irrigation to ensure survival of the living system during „�. periods of drier weather. This may be achieved through a piped system,gutter flow or through the tree grate. 'MK Mir www.filterra.com rof 4.. wW filterra Bioretention Systems Activation Al" A. Activation of the Filterra®unit is performed ONLY by the Supplier. Purchaser is responsible for Filterra®inlet protection and subsequent clean out cost. This process cannot commence until the project site is fully stabilized and cleaned(full landscaping,grass cover,final paving and street sweeping completed),negating the chance of construction materials contaminating the Filterra® sow system. Care shall be taken during construction not to damage the protective throat and top plates. wwr ,.. B. Activation includes installation of plant(s)and mulch layers as necessary. vair Air 1111, Included Maintenance A. Each correctly installed Filterra®unit is to be maintained by the Supplier,or a Supplier approved contractor for a minimum period of 1 year.The cost of this service is to be included in the price of each Filterra®unit. Extended maintenance contracts are available at extra cost upon request. wr B. Annual included maintenance consists of a maximum of(2)scheduled visits.The visits are .r. scheduled seasonally;the spring visit aims to clean up after winter loads that may include salts w. and sands. The fall visit helps the system by removing excessive leaf litter. Air C. Each Included Maintenance visit consists of the following tasks. ww 1. Filterra®unit inspection 2. Foreign debris,silt,mulch&trash removal • 3. Filter media evaluation and recharge as necessary 4. Plant health evaluation and pruning or replacement as necessary 5. Replacement of mulch 411"` 6. Disposal of all maintenance refuse items 7. Maintenance records updated and stored(reports available upon request) sir D. The beginning and ending date of Supplier's obligation to maintain the installed system shall be — determined by the Supplier at the time the system is activated. Owners must promptly notify the Supplier of any damage to the plant(s),which constitute(s)an integral part of the bioretention technology. ww wiir wr VIP www.filterra.com aw. ,or ior S w. w. w,-\I%UTCwu® e.%.7� 1 • ` TY. The Stormwater Management CONSTRUCTION PRODUCTS INC. StormFilter Sizing Summary rr Crown BMW �.. Charlottesville, Virginia Stormwater Treatment System - Design Summary June 29`h, 2011 w. Information provided by Ankita Kot: Structure ID Contributing Impervious Water Quality Peak 10-Yr Area (ac) Area (ac) Flow (cfs) Flow Rate (cfs) Vi,, 2A (CBSF#1) 0.18 0.16 0.85 0.053 1.11 2B (MHSF#2) 0.32 0.32 0.90 0.100 2.09 3 (CBSF#3 0.37 0.32 0.85 0.110 2.08 wr • Presiding agency=VDCR w. ,r„ Design Criteria: • Design storm= Modified Rational method • Rainfall intensity=0.35in/hr(currently accepted by the VDCR) • Media=Zeolite/Perlite/GAC • Head Requirement(Operating Head-Outlet Elevation) = 33"for 27"Cartridges, 24"for 18"Cartridges, 18"for 18" Low- w,. Drop Cartridges • Cartridge Operating Flow @ 2 gpm/sf=22.5 gpm (27"), 15 gpm (18"), 10 gpm(18" Low-Drop) Size estimates: The Stormwater Management StormFilter® is a passive, siphon-actuated, flow-through stormwater filtration system consisting of a structure that houses rechargeable, media-filled filter cartridges. The StormFilter works by passing stormwater through the media-filled cartridges, which trap particulates and adsorb pollutants such as dissolved metals, nutrients, and hydrocarbons. The StormFilter system is VDCR verified and as a result has received approval for 80% TSS and 50% TP removal(65%TP Removal in some locations). mir ... The StormFilter is a flow-based system utilizing cartridges flowing at 2 gpm/ft2 of filter media. The system is sized by calculating the peak water quality flow rate associated with the design storm. The water quality flow rate was calculated using the ' Modified Rational Method assuming a rainfall intensity of 0.35 inches per hour. w.r Given the information above the treatment flow rate was determined to be: Y,. 2A (CBSF#1) w~ QJreat =CiA=0.85x0.35'% x0.18=0.053cfs Air area, x 449 gl% 0.053cfs x 449 gP%f. Ncartridges = = z =1.58- use(2)18"cartridges 1 { gp/z rr' SAcar,r,dge x Qspecfic(cart) 7.5 0 f x 2 m fJ w. w• 2B (MHSF#2) w. Q,rea, =CiA=0.85 x 0.35 i�Y x 0.32=0.100cfs 605 Global Way,Suite 113,Linthicum,MD 21090 ow Toll-free:866.740.3318 Fax:866.376.8511 Provided By CONTECH on: 6/30/2011 .w may vow 11407411011711 r`t�r� The Stormwater Management CONSTRUCTION•R`UC S INC. StormFilter Sizing Summary Qtreat x 449 gp/fs 0.100cfs x 449 gp�fs — ,� N cartridges = = z —2.99 use(3)18 cartridges { gpm �' SA cartridge X Qspec�frc(cart) 7.50 ft X 2 f, 3 (CBSF#3) areal =CiA=0.90x0.35inhrx0.32=0.100cfs Iry "' Qtreat x 449 '%rs 0.100cfs x 449 gPnXfs == = 2 / —2.99-3 use(3)18"cartridges ( gpm '� Acartndge X Qspecr0c(cart) 7.50 ft X 2 ftz atlr ,., Structure ID # of 18" cartridges required Recommended StormFilter Configuration 2A (CBSF#1) 2 2 cartridge "deep" steel catch basin 2B (MHSF#2) 3 48" diameter manhole 3 (CBSF#3) 3 3 cartridge "deep" steel catch basin Amy The 18"tall cartridge contains 7.50 square feet of media and a radial media depth of seven inches.The estimated cost of this system,complete and delivered to the job site, is available upon request. The contractor is responsible for setting the StormFilter .. vault and all external piping. ..r Maintenance: ,.. The StormFilter requires regular maintenance to operate effectively. CONTECH recommends annual inspections, with full maintenance typically required every 24-36 months. Disposal of material should be handled in accordance with 00. local regulations. Please contact CONTECH's Maintenance Department for all questions regarding maintenance at 866- 740-3318 or visit our website at www.contech-cpi.com/maintenance. w ASP 605 Global Way,Suite 113,Linthicum,MD 21090 Toll-free:866.740.3318 Fax:866.376.8511 Provided By CONTECH on: 6/30/2011 •■• 9 ilk 1/ 1■111illE/PALL.11® 0 .211,:i\.. ■ r��— STORM VATER - �'°- —'SOLUTIONS INC. Filtration Products fr, . b k9 s1 i tar 1 111. i 1111. "' 4rrZ W"+2eE W 4a 3rd. — "'` ;t .-4 '-..+.ter^ —r ix t 41110 1 ill. r - -� ; i "^r. -Y..?.,-A.o,«�-�,..., -'»4�..�tr v7 4` -+Sp-er4- S^Ps" "'.. : i a ' The Stormwater Management lit for +' StormFilter MFS Iwo it , W kW law w "r low StormFIIter .-,} �.. tom .�.,sue.:. i. ti..�.�.�. vt�_#..3t. :'". �...,. fi E `t"�,.-..?�t"+x- _ ;` .: me Stormwater rn.nxyemet r.• Siphon-actuated filtration StormFilter The Stormwater Management StormFilter®products clean stormwater through a patented passive ifiltration system,effectively removing pollutants to meet the most stringent regulatory requirements. ® Highly reliable,easy to install and maintain,and proven performance over time,StormFilter products are recognized as a versatile BMP for removing a variety of pollutants,such as sediments,oil and O grease, metals,organics,and nutrients.These systems come in variable configurations to match local conditions and come with prolonged maintenance periods to ensure long-term performance and fb reduce operating costs. i How does it work? 0 i LIFTING TAB AIR LOCK CAP WITH CHECK VALVE During a storm,runoff passes through the filtration 410 iiii media and starts filling the cartridge center tube.Air � FLOAT VALVE below the hood is purged through a one-way check valve I 'j "" - - P 9 9 Y "r' ti F —HOOD as the water rises.When water reaches the top of the FILTER MEDIA s . OUTER MESH float,buoyant forces pull the float free and allow filtered *sr i2 a F ,. µ5i CENTER TUBE ,I`Ht L k-'I k---vi,i': water to drain. \ - After the storm,the water level in the structure starts •rIr y �. -i- _; 1 falling.A hanging water column remains under SCRUBBING REGULATOR ` / UNFILTERED WATER the cartridge hood until the water level reaches the �r t ` ,, •°r scrubbing regulators.Air then rushes through the TN .e I ,F FILTERED WATER I giel -� �A� regulators releasing water and creating air bubbles UNDER-DRAIN MANIFOLD • , that agitate the surface of the filter media,causing accumulated sediment to drop to the vault floor. This _ ,r00.....4'° ` patented surface-cleaning mechanism helps restore the FILTERED WATER "° VAULT FLOOR filter's permeability between storm events. vow '' .ile P:. UNDER-DRAIN MANIFOLD i CAST INTO VAULT FLOOR r Oar FLOW SPREADER ' .°' "u StormFilter ''`` te7''- �,. .� / INLET PIPE lar L JA's • Extensive field verification studies prove ,_ - ,,:- �'"" performance .7� _ . - '"`4,' . ' .,,a� ; `a 'mo p INTERNAL HIGH 0. !.. '.R 4 °'. 'ia.L.,t ' "� 't FLOW BYPASS •ra 'a rS . 5? fi .-4`. 4 'F$",i?s e S i '€}a:,ry .� • Surface cleaning mechanism extends maintenance intervals - - ` ,� -t -.27t..14,- AIW j • Uniform sediment loading increases I ,4 , --2 t __' = i -_ cartridge longevity OUTLETPPE A I �, vow • Five optimized configurations fit different , / I ,Or applications UNDER DRAIN OUTLETS- •,' - ` / I - :v . • Cartridge-based system provides exact OUTLET BAY z._,. a FILTRATION BAY sizing UNDER DRAIN MANIFOLD I OP • Dry sump means no water to remove during maintenance 0 I i • ---emr,4=. ,,,, „,==- .s+ts»a 4 -+ r g.`—.77:- � ,1 —,. [ 2 x�-aw a� `r ',7 y 4 � 6F �Y,..R +s R� ffi +, 4"^^ h , pp#M,+� .. .. _ _ .. .- F • t • (€ • ! 1 • i f io likw i 1 1 F S _ � ; _ r�,�...�.� :, 2 ---;;„ ..3„"4t2", — :`e „ "gam 3 ;���'7id's,�,t�v^; 4 - i , Media Filtration System Iwo The MFS media filtration system utilizes variable flow controls,media-filled cartridges,and * " tea.. `'+ vow storage sump to capture and retain a broad spectrum of pollutants to meet stringent =F.°" - regulatory requirements.Variable flow controls insure the system matches the influent flow `or to lower the average treatment flow rate and maximize performance.The large storage 11111, sump ensures system longevity on sites with heavy loading and eliminates the need for an upstream storage sump in roadway applications.With scalable cartridges available in * � ' f — multiple heights,the system can be sized to meet specific flow rates and stay within the = t ,,R. { available hydraulic grade line on the project. - .� 'sry j 1 How does It work? `' � 1 i Stormwater runoff entering the system is diverted by a weir and flows to the portion of the vault beneath the cartridges,where larger solids will settle and be captured. As the water level rises,the variable flow controls,which include the outlet box, slide gate and float system restrict cartridge flow rate,causing the system to fill OFTING HANDLE OM OVERFLOW OUTLET - vrr and submerge the cartridges.The polluted stormwater enters the cartridge and F 4;- 4 is filtered through the media bed before entering the perforated center tube,and © ' 0 out into the collector manifold. OUTER SCREEN ,� O I I Ii`7TI"� '' 1L1Ii .,> © ! The variable flow controls remain closed until the water level reaches the top ;'a?I 0 itp p ' low of the cartridges and the media is fully submerged.Once submerged the net t { ; CENTER TUBE �q1 1 Ilfflf =g,41,,a Air pressure distribution across the vertical media face is uniform to minimize the "➢( G I,Iy FILTER MEDIA IMO hydraulic loading rate and ensuring equal usage of the entire media bed. ill,1 G - 1 , ; ■ © 4t. As the water level rises above the cartridge the float valve opens the slide gate SCREEN FRAME d'h I 0 �{ 7� UNFRTEREU WATER •are to increase the treatment flow rate. For small storms the slide gate only opens , or�,i; 0( .rr • s e enough to match the influent flow rate reducing the average treatment flow "' =4* �• rate.The slide only opens completely at the design storm flow rate,which is Air infrequent. — At the end of the storm event,the remaining water is slowly filtered at the 1-3 rr gpm per cartridge flow rate until the vault is drained to the invert of the outlet pipe. LADDER VIP MFS .r. "T , FLOAT ARM • Provides storage space for gravity settlement � aK ' and storage of larger sized sediments err s • Cartridges can be designed using different , s}, �_ Jr� FLOAT heights INLET PIPE a --yt v -1" ' 'I'd" �{ _ r ,f� 1—OUTLET •• Variable flow control y""""" , ,. i.NE ....,p`: -_'�" • - • Cartridges designed to accept various types of vow I t �" media '� � SLIDE GATE """ R i Iii-r-,-`` €� 1 14,41 , .- • Proven performance verified through testing in w I ' accordance with accepted protocols = - i _ OUTLET BOX • Available in manhole,vault, high flow,catch 4 basin, curb inlet and volume configurations R� , COLLECTOR BOX CARTRIDGES COLLECTOR MANIFOLD `.' SUPPORT RACK l • 0 i 40 IOW VP Media and Accessories r . .... n vw vow Media Choices yr Our filtration products can be customized using different filter media to target site-specific pollutants. ,r A combination of media is often recommended to maximize pollutant removal effectiveness. Asp -r .1: ` 3 .` °* Perlite is naturally occurring puffed volcanic ash. Effective for Perlite CSF MetalRx Zeolite GAC removing TSS,oil and grease. Sediments Oil and Grease CSF" Leaf Media and MetalRx" are created from deciduous leaves Soluble VP' processed into granular,organic media.CSF is most effective for Metals • removing soluble metals,TSS,oil and grease,and buffering acid Organics rain. MetalRx,a finer gradation,is used for higher levels of metal removal. Nutrients • • k Note:Indicated media are most effective for associated pollutant type.Other media may treat pollutants,but to a /iO4%a Zeol■to is a naturally occurring mineral used to remove soluble lesser degree. ,�,V`f .5 a metals,ammonium and some organics. ',low hr GAC(Granular Activated Carbon)has a micro-porous structure with 4110 an extensive surface area to provide high levels of adsorption.It is primarily used to remove oil and grease and organics such as PAHs and phthalates. StormFilter Accessories ' Drain-Down err • Provides complete dewatering of the StormFilter vault by gradually removing residual water in the sump after the storm event mow • Aids in vector control by eliminating mosquito-breeding habitat 1110, •• Eliminates putrefaction and leaching of collected pollutants �"' • Lowers maintenance cost by reducing decanting and disposal volume • hr Sorbent Hood Cover ?' ` • Absorbs free surface oil and grease on contact • Will not release captured oil,even when saturated . • Made from recycled synthetic fiber ;7-^-5----' jq AO mriM a ;E7}1 ...f iII ' 3=t` y v • h S IAA• . 4 "Iii-"Iii- 0,k ,lr� 11110 -..s 7 -* r- a a ,acs = -* v. ...y,a,:g":4+ : x . . ,C'"sue - 3., z ro- , -4 0,Ye -'a n` c n '� .7.1;",,; - *e tkazaa ^'' a' 't,l' '0,1 +- —:',7:7,'-'-": r* sir .F,x^.,f 4..n_:e .' _.a--+as�«;t• two d it ip w Configurations and Flow Rates b. Cartridge Flow Rate . Specific Flow Rate 'StormFilter MFS t q (gpmlft2) 18" 12 22'. 12" i" if; 4111100 .1 7.5 gpm 5 gpm 18 gpm 5 gpm •0 �, 2 15gpm 10gpm 9gpm 10gpm 41100 , — StormFilter MFS it Vir Model Description Hdr.Ltc Inle_Iype , :' ,-: Dr3p/Depth ' s •.:,.. .v � lir x" `�aa�e 3i pia tb t `ft ixaltt. r +11110 Vault/Manhole • Treats small to medium sized sites / f v.:;:,,a.: :;, 2.3(inlet 700 Conveyed Flow • Simple installation-arrives on-site fully � {" to outlet) Pipe(s) +0 assembled -,d .' +r High Flow • Treats flows from large sites 2.3(inlet 700 Conveyed Flow • Consists of large,precast components to outlet) Pipe(s) designed for easy assembly on-site # ' 'Or f gip DryWell • Provides treatment and infiltration in one , 1.75(inlet to 530 Conveyed Flow (only available structure a €'. fortheStormFilter I'; filtration deck) Pipe(s)or wp cartridge) • Available for new construction and retrofit I = $ r Sheet Flow applications i� Inlet Grate +rrr • Easy installation \ ,► s `� \ t I. CatchBasin • Provides a low cost, low drop,point-of-entry --)- I configuration 2.3(inlet 700 Sheet Flow _ to outlet) Inlet Grate • Treats sheet flow from small sites w� and/or Pipe • Uses drop from the inlet grate to line ..r conveyance pipe to drive the passive �' *$ filtration cartridges r'- 4' low Volume • Meets volume-based stormwater treatment ! ` 2.0 700 Conveyed Flow regulations , Pipe(s) • Captures and treats site specific Water AIR Quality Volume(WQv) • StormFilter cartridges provide treatment and control the discharge rate • Can be designed to capture all,or a portion, Air of the WQv Curb-Inlet • Provides a low drop,point-of-entry configuration 5 1520 Gutter Flow IAl► • Accommodates curb inlet openings from 3 "` 4 �'.((top of curb Curb-Inlet ,- 4 - -rte to outlet) and/or Pipe to 10 feet long %,_ — • Uses drop from the curb inlet to the +IMr conveyance pipe to drive the passive - filtration cartridges w page 5 'fir+ tom+ NW r Iry toy vow 1410 r filtration !oi Low Drop Sites 7 -. Air Designing for Limited Drop lior In some cases,site constraints limit the hydraulic drop that is available to drive the passive filtration cartridges.Following are a variety of solutions to either create the required drop or work around the limited drop without impacting the performance of the system. Filter configuration 11110 using low drop cartridges -1.8 ft from inlet to outlet '`111/ * (compared to 2.3 ft for 18" _,t , cartridges) 111110 , IV tilir "-L. r hir / mow . -----1 —I \o 1.8 ft from inlet to ■ outlet for low drop , �'(\ "\ "\ �' configurations,2.3 ft :::;:• � ,• ,, , for 18"cartridges w • '— - '— _•_- l l gar Solutions for Low Drop Sites ilist -`' Few 4 i4: p i" vs r 1#7 r.. - e M _x fig Iirf Reduce Pipe Use an alternate pipe material with a lower Use Low Drop The MFS and StormFilter can be configured with low NV Slope Manning's n value for a portion of the site and Cartridges drop cartridges that activate at 12",reducing the overall reduce the pipe slope. head loss to only 1.8 ft, compared to 2.3 ft for the VW standard cartridge. The tradeoff, however, is a larger Reduce Pipe Use ductile iron pipe(DIP)or controlled density fill Cover (CDF) at the front end of the conveyance system system requiring 50%more cartridges. to minimize pipe cover and raise the conveyance Surcharge the Backing up water into the conveyance system can create system.CDF,a method of pouring concrete with fine Inlet Pipe the necessary drop to drive the StormFilter cartridges. aggregate(sand vs.gravel)around pipe,allows the This will affect the HGL and increase the volume of water use of most pipe materials with limited cover. required to activate the cartridges, which could have a wY detrimental affect on system longevity. The following Drain Inlet Substitute several shallow inlet configurations for the design modifications mitigate these risks: Treatment single end-of-pipe system. Shallow options include • Confer with a CONTECH stormwater design engineer the CatchBasin StormFilter, Curblnlet StormFilter before surcharging the inlet pipe VIP and the Linear StormFilter. These systems still re- • Verify this is an acceptable practice in your local quire the normal drop(2.3 ft for 18"cartridges)but jurisdiction utilize the drop into the conveyance system to drive • Modify the overall system design to accommodate the the cartridges. increased HGL w Provide CONTECH Stormwater Solutions offers the IPS • Surcharge up to.7 ft—add 20%more cartridges Pumping (Integrated Pumping System)that can be designed • Surcharge up to 1.3 ft—add 30%more cartridges IOW System in tandem with filtration system sizing. • Surcharge up to 1.8 ft (max) — add 40% more cartridges • Limit backwater to a maximum of 500 gallons 1111110 ' Evaluate The StormVault,which utilizes volumetric separation to StormVault treat stormwater, requires no drop across the structure 411110 and provides a high level of treatment that is fully • approved in many jurisdictions. It can also provide storage in addition to treatment. Itor tillf 111+ Vir Maintenance - : _. .. r .! Ili The primary purpose of CONTECH Stormwater Solutions The CONTECH Stormwater Solutions maintenance team is +r filtration products is to filter out and prevent pollutants from available to assist customers with their maintenance needs. We entering our waterways.Like any effective treatment system, offer both long-term contracts and single maintenance plans. r.r periodically these pollutants must be removed to restore the Our team can perform full-service maintenance or provide the .ry filter to its full efficiency and effectiveness. necessary support for the owner to do it themselves. 11W Maintenance requirements and frequency are dependent on As part of our cartridge recycling program,our cartridges are the pollutant load characteristics of each site.Our filtration emptied,washed,and refurbished for reuse. rr systems are typically designed for a one year maintenance .r. cycle. tir vr. 1 �' ,4se Pik Fe?1p11 Y ..p .V ...F _ T . gig �"` • l '-'G '• Yk > e1 iw+ Y M § r } S �(1 F'.r V t'� • .,,44,4.1* ... . 5. --- _. -\ fi. $ 3'i y-- T.,e.-;', " 6'.,s -� i }si•. „-.y s� 3 t t"4-'� • 'kt r .x _ _ i r �,?Vw.i a '- 4.- ' �., .. .5r'� - Y IMP S^ +..�, � � f .a-m F % � � a r,v , 11 � µ: f e � t Y i1.# ` •w tit, : ‘ 7:4°.17",„!'f)17.„:",:,:ti...6",i4,. .4,„:;17,;,„-. 1ft,...-.0.''. 1-a,..3..._--- 4,-:: -_-.--.1'—;1. :r.: • ''''--.7 'I'f '' ' ::,47.f'14*..::-7;'''''''717'.7::.. :,4:::;::,:::.:4:'-,,..' :17.-:;;1;14;7: 4.trE.,,4- p eat ''p, t€ _ a�sL{ ;;;,;:: 4'.---n ; . ''fit r _ -�, 'A .'- i 1 t 'i'n' . -.-'777-,,,-,4,`,."7 _ � } ,y��, �,{�� pia •� L � 1 l� G �-`-myy"�"� r.__... -, .c ' a_;.,,-,...- _ is ,tr' 1,,.:',i:•,• -•,...„.,.--' .,., . s- , '- _ r,4.- a♦ 4o _�•'---•• im]c.. . 'TY r .. t �� _ e .S _ i.-e s:"" ,z, ( V,...wz,z , : ,.s,asr M'.. .. . _iR-' 1E,0*".,, 7'.,,54x; gg'a-.; c - _ tnr r-t gam= , y Itars i tow tier §lIr err► larr Customer Support .: y ;, y h ..a Engineering Design & Technical Support 411. To ensure optimum performance of our products in residential,commercial,municipal and r• *sr industrial applications,our dedicated team provides the highest level of customer service - +rr and engineering support. "� ik � + .J gee Research & Development :; p tit: --*_ Z At our state-of-the-art laboratories,CONTECH Stormwater Solutions engineers and loro 4 '` xf •, scientists conduct ongoing research to further the understanding of non-point source f _ — mor pollution and develop practical product solutions. ) +rr Our products are continually tested and refined,both in the lab and the field to ensure -- , I •rile maximum reliability and performance. r ... 4 1.,,,,,„; . • 041!-. 'MY rf. I Installation Support Air CONTECH Stormwater Solutions'products are some of the easiest to install in the industry. { ..i"a- t ,,,,J I •ar We provide comprehensive installation details and instructions,as well as full technical "� "� support on every project. ^: r low yr i"` �. 1 ~t 4. r 3 t. J '. 1a.1.774,';'.t.1".,3..4 'J`• b jx�" r ,. z kw q =G 41FP11%av mw Support STORPAWATER `--5 11JON5_ iiiv • Drawings and specifications are available at contechstormwater.com. • Site-specific design support is available from our engineers. 800.925.5240 ‘1110 contechstormwater.com ©2007 CONTECH Stormwater Solutions CONTECH Construction Products Inc.provides site solutions for the civil engineering industry.CONTECH's portfolio includes bridges,drainage,sanitary sewer,stormwater and earth stabilization products.For information on other CONTECH division IV offerings,visit contech-cpi.com or call 800.338.1122 Nothing in this catalog should be construed as an expressed warranty or an implied warranty of merchantability or fitness for ar, any particular purpose.See the CONTECH standard quotation or acknoweldgement for applicable warranties and other terms •rte and conditions of sale. The product(s)described may be protected by one or more of the following US patents: 5,322,629;5,624,576;5,707,527;5,759,415;5,788,848;5,985,157;6,027,639;6.350,374; ■ ilipo 6,406,218;6,641,720;6,511,595;6,649,048;6,991,114;6,998,038;7,186,058;related foreign patents or other patents pending. The Stormwater Management StormFilter,MFS and CDS are trademarks,registered trademarks,or licensed trademarks of CONTECH Construction Products Inc. �`r�i_ti 10 INV i lEalter Ell ... STORtu�tilVA1FR - , SOLUTIONS. Air StormFilter Inspection and . Maintenance Procedures to t a H y Frm "✓ t. i 4. °o�.ce'ai( a" ., PI - t o x , %•*q ,l f ^x A I � � 1ht S4ia++*�Y�"!f 41t,49l+n n[ { mir StormFilter I . r 4 4 Air Maintenance Guidelines In addition to these two activities,it is important to check The primary purpose of the Stormwater Management the condition of the StormFilter unit after major storms for 'NW StormFilter' is to filter out and prevent pollutants from entering potential damage caused by high flows and for high sediment +rr accumulation that may be caused by localized erosion in the our waterways. Like any effective filtration system, periodically these pollutants must be removed to restore the StormFilter to its drainage area.It may be necessary to adjust the inspection/ qw full efficiency and effectiveness. maintenance schedule depending on the actual operating conditions encountered by the system. In general,inspection any Maintenance requirements and frequency are dependent on the activities can be conducted at any time,and maintenance should +err pollutant load characteristics of each site. Maintenance activities occur, if warranted,in late summer to early fall when flows into may be required in the event of a chemical spill or due to the system are not likely to be present. `rf' excessive sediment loading from site erosion or extreme storms.It is a good practice to inspect the system after major storm events. Maintenance Frequency 111111, The primary factor controlling timing of maintenance of the Maintenance Procedures StormFilter is sediment loading. - Although there are likely many effective maintenance A properly functioning system will remove solids from water by yaw options, we believe the following procedure is efficient and q can be implemented using common equipment and existing trapping particulates in the porous structure of the filter media maintenance protocols. A two step procedure is recommended inside the cartridges.The flow through the system will naturally as follows: decrease as more and more particulates are trapped. Eventually the flow through the cartridges will be low enough to require vr► 1. Inspection replacement.It may be possible to extend the usable span of the Inspection of the vault interior to determine the need for cartridges by removing sediment from upstream trapping devices "r"' on a routine as-needed basis in order to prevent material from maintenance, being re-suspended and discharged to the StormFilter treatment vw 2. Maintenance system. q, Cartridge replacement Sediment removal Site conditions greatly influence maintenance requirements. ,�„ StormFilter units located in areas with erosion or active Inspection and Maintenance Timing construction may need to be inspected and maintained more 'o` At least one scheduled inspection should take place per year with often than those with fully stabilized surface conditions. �, maintenance following as warranted. The maintenance frequency may be adjusted as additional First,an inspection should be done before the winter season. monitoring information becomes available during the inspection °` program.Areas that develop known problems should be During the inspection the need for maintenance should be ++w determined and,if disposal during maintenance will be required, inspected more frequently than areas that demonstrate no samples of the accumulated sediments and media should be problems,particularly after major storms. Ultimately,inspection ar obtained. and maintenance activities should be scheduled based on the • historic records and characteristics of an individual StormFilter - Second,if warranted,a maintenance(replacement of the filter system or site. It is recommended that the site owner develop cartridges and removal of accumulated sediments)should be a database to properly manage StormFilter inspection and +rr performed during periods of dry weather. maintenance programs. ■ 'ow Prior to the development of the maintenance database,the +rr following maintenance frequencies should be followed: ,.r Inspection k- a- 4 . _ One time per year `�1 After major storms �'A ` ' `3, Maintenance � �' ;;� r r' As needed, based on results of inspection(The average 8 ' "': _.. + `' maintenance lifecycle is approximately 1-3 years) , ±? r, y 4 Per Regulatory requirement 31,:,, .x . - . In the event of a chemical spill ' ' ". a z1 ,—,--- - Frequencies should be updated as required.The recommended " = initial frequency for inspection is one time per year.StormFilter .�. '°" '' } z units should be inspected after major storms. i i i 2 141. IV wr .,r .r Sediment removal and cartridge replacement on an as needed 7.Remove safety equipment. basis is recommended unless site conditions warrant. 8.If appropriate,make notes about the local drainage area rr Once an understanding of site characteristics has been relative to ongoing construction,erosion problems,or high 'M` established, maintenance may not be needed for one to three loading of other materials to the system. years, but inspection is warranted and recommended annually. 9.Discuss conditions that suggest maintenance and make vo decision as to weather or not maintenance is needed. Inspection Procedures Maintenance Decision Tree The primary goal of an inspection is to assess the condition of The need for maintenance is typically based on results of the '"" the cartridges relative to the level of visual sediment loading as inspection. The following Maintenance Decision Tree should be used as r, it relates to decreased treatment capacity. It may be desirable to a general guide. (Other factors,such as Regulatory Requirements,may conduct this inspection during a storm to observe the relative need to be considered) .r► flow through the filter cartridges. If the submerged cartridges are severely plugged,then typically large amounts of sediments `j will be present and very little flow will be discharged from the '* `' : ! ,_ ri drainage pipes. If this is the case,then maintenance is warranted _ "'< , and the cartridges need to be replaced. . :- +rr Warning: In the case of a spill,the worker should abort - inspection activities until the proper guidance is obtained. # : • • Notify the local hazard control agency and CONTECH ." , Stormwater Solutions immediately. s i To conduct an inspection: ti Important:Inspection should be performed by a person who is familiar with the operation and configuration of the StormFilter treatment unit. c� d r <. 1.If applicable,set up safety equipment to protect and notify `� -. . surrounding vehicle and pedestrian traffic. 2.Visually inspect the external condition of the unit and take 1.Sediment loading on the vault floor. iM notes concerning defects/problems. a. If>4"of accumulated sediment,maintenance is 11W = ,'r 1 required. • . , f"j - r�. ` 2.Sediment loading on top of the cartridge. * } ..%' a. If>1/4"of accumulation, maintenance is required. 1",--.4.,--",, - -. w,;z-'r`, ° - � 3.Submerged cartridges. rYn . u .� a. If>4"of static water in the cartridge bay for more ..•�,r.,!.as _ - , that 24 hours after end of rain event,maintenance is U .. required. -, 4.Plugged media. ril► - a. If pore space between media granules is absent, �+ � _ maintenance is required. s� "- 5.Bypass condition. Irv " "1` a. If inspection is conducted during an average rain fall P 9 9 � - event and StormFilter remains in bypass condition t ` (water over the internal outlet baffle wall or submerged • M+► 01 .. ' _- cartridges),maintenance is required. A or 3.Open the access portals to the vault and allow the system vent. 6.Hazardous material release. 4.Without entering the vault,visually inspect the inside of the a. If hazardous material release(automotive fluids or other) Iv unit,and note accumulations of liquids and solids. is reported,maintenance is required. w. 5.Be sure to record the level of sediment build-up on the floor of 7.Pronounced scum line. the vault,in the forebay,and on top of the cartridges. If flow w a. If pronounced scum line(say? 1/4"thick)is present • is occurring,note the flow of water per drainage pipe.Record above top cap,maintenance is required. ally all observations. Digital pictures are valuable for historical documentation. 8.Calendar Lifecycle. +r 6.Close and fasten the access portals. a. If system has not been maintained for 3 years maintenance is required. 3 arr w ler mow Apr Assumptions • No rainfall for 24 hours or more t - k; may • No upstream detention(at least not draining into StormFilter) .v, �4 • Structure is online "i „„ • Outlet pipe is clear of obstruction ' U• - 'V to ar. • Construction bypass is plugged = 6 <;. , Maintenance - +� � F � fir, Depending on the configuration of the particular system, f z f •wr , . . maintenance personnel will be required to enter the vault to perform the maintenance. Y Important:If vault entry is required,OSHA rules for confined 4 # - - � space entry must be followed. j# '� t :�, • vr+ Filter cartridge replacement should occur during dry weather. �' rt 4 r - — It may be necessary to plug the filter inlet pipe if base flows is F occurring. . i Replacement cartridges can be delivered to the site or customers I ,,- - k .rr facility.Information concerning how to obtain the replacement i- ' ` - E % ". cartridges is available from CONTECH Stormwater Solutions. ' 4 ` y` . - - :s.:.:I 1- Warning: In the case of a spill,the maintenance personnel """ q t should abort maintenance activities until the proper a f- 7 guidance is obtained. Notify the local hazard control ,.--_ wow agency and CONTECH Stormwater Solutions immediately. vll/ To conduct cartridge replacement and sediment removal - ,yp maintenance: Important:Note that cartridges containing leaf media(CSF)do 1.If applicable,set up safety equipment to protect maintenance not require unscrewing from their connectors.Take care personnel and pedestrians from site hazards. not to damage the manifold connectors.This connector tio• 2.Visually inspect the external condition of the unit and take should remain installed in the manifold and could be notes concerning defects/problems. capped during the maintenance activity to prevent nlrr sediments from entering the underdrain manifold. 3.Open the doors(access portals)to the vault and allow the Nor system to vent. B. Remove the used cartridges(up to 250 lbs.each)from the 4.Without entering the vault,give the inside of the unit, vault. • • including components,a general condition inspection. Important:Care must be used to avoid damaging the 5.Make notes about the external and internal condition of cartridges during removal and installation.The cost of the vault.Give particular attention to recording the level of repairing components damaged during maintenance sediment build-up on the floor of the vault,in the forebay, will be the responsibility of the owner unless CONTECH • and on top of the internal components. Stormwater Solutions performs the maintenance activities 6.Using appropriate equipment offload the replacement and damage is not related to discharges to the system. C. Set the used cartridge aside or load onto the hauling cartridges(up to 150 lbs.each)and set aside. 7.Remove used cartridges from the vault using one of the truck. following methods: D. Continue steps a through c until all cartridges have been Method 1: removed. r A. This activity will require that maintenance personnel enter the vault to remove the cartridges from the under drain Method 2: 4111, manifold and place them under the vault opening for A. Enter the vault using appropriate confined space AW lifting(removal). Unscrew(counterclockwise rotations) protocols. each filter cartridge from the underdrain connector. B. Unscrew the cartridge cap. vow Roll the loose cartridge,on edge,to a convenient spot beneath the vault access. C. Remove the cartridge hood screws(3)hood and float. w Using appropriate hoisting equipment,attach a cable D. At location under structure access,tip the cartridge on its 'w'` from the boom,crane,or tripod to the loose cartridge, side. Contact CONTECH Stormwater Solutions for suggested attachment devices. isr 4 • Nor w MAY w * Important Note that cartridges containing media other than 11.Close and fasten the door. • the leaf media require unscrewing from their threaded 12. Remove safety equipment. connectors.Take care not to damage the manifold 13. Finally,dispose of the accumulated materials in accordance connectors.This connector should remain installed in the with applicable regulations. Make arrangements to return the manifold and capped if necessary. used empty cartridges to CONTECH Stormwater Solutions. D. Empty the cartridge onto the vault floor.Reassemble the +r empty cartridge. rr E. Set the empty,used cartridge aside or load onto the r t ` hauling truck. 'tom """.' F. Continue steps a through e until all cartridges have been war removed. `' .-- S PI v _ :._f ‘5 * .rYt ,1-,-7a-. 1�.y 31 VM • - - tl ,- • rl' .. �.A l," mar '/ G it, -.; aka - ten*` St 44 in. AW Y Ilir * _ri�x � 5b Si . rW a Ski. !�,r r r it k: .r r"I i a r Allr 8. Remove accumulated sediment from the floor of the vow vault and from the forebay.This can most effectively be _ accomplished by use of a vacuum truck. &-..t---1,0,-= , 9.Once the sediments are removed,assess the condition of the x T = ..,x +1 vault and the condition of the connectors.The connectors " -, .- •-�:-� °' § • are short sections of 2-inch schedule 40 PVC,or threaded .` s schedule 80 PVC that should protrude about 1"above the — .' ' • floor of the vault.Lightly wash down the vault interior. _ a. If desired,apply a light coating of FDA approved • silicon lube to the outside of the exposed portion of - •� • the connectors.This ensures a watertight connection between the cartridge and the drainage pipe. Cr b. Replace any damaged connectors. • 10. Using the vacuum truck boom,crane,or tripod,lower and • install the new cartridges.Once again,take care not to , damage connections. • f • i 410, i' 5 t ver Related Maintenance Activities - Material Disposal •.r Performed on an as-needed basis The accumulated sediment found in stormwater treatment StormFilter units are often just one of many structures in a more and conveyance systems must be handled and disposed of in mop comprehensive stormwater drainage and treatment system. accordance with regulatory protocols. It is possible for sediments to contain measurable concentrations of heavy metals and `tl1� In order for maintenance of the StormFilter to be successful, it organic chemicals(such as pesticides and petroleum products). is imperative that all other components be properly maintained. Areas with the greatest potential for high pollutant loading The maintenance/repair of upstream facilities should be carried include industrial areas and heavily traveled roads. +.• out prior to StormFilter maintenance activities. Sediments and water must be disposed of in accordance with 441. In addition to considering upstream facilities,it is also important all applicable waste disposal regulations.When scheduling to correct any problems identified in the drainage area. Drainage maintenance,consideration must be made for the disposal of area concerns may include:erosion problems,heavy oil loading, solid and liquid wastes.This typically requires coordination with rr and discharges of inappropriate materials. a local landfill for solid waste disposal. For liquid waste disposal a number of options are available including a municipal vacuum VIP truck decant facility,local waste water treatment plant or on-site treatment and discharge. +fir err IOW +r irr ar 911' RECYCLED PAPER wr ijfLy t 3HlRVW'Wid[ � - mar "�—���34Ltf11UN5. 800.925.5240 "" contechstormwater.com +r. Support • Drawings and specifications are available at contechstormwater.com. • Site-specific design support is available from our engineers. ©2007 CONTECH Stormwater Solutions • CONTECH Construction Products Inc.provides site solutions for the civil engineering industry.CONTECH's portfolio includes "■■• bridges,drainage,sanitary sewer,stormwater and earth stabilization products.For information on other CONTECH division offerings,visit contech-cpi.com or call 800.338.1122 w Nothing in this catalog should be construed as an expressed warranty or an implied warranty of merchantability or fitness for ®r any particular purpose.See the CONTECH standard quotation or acknowledgement for applicable warranties and other terms and conditions of sale. .r. 'r ,w VIM Inspection Report _ 1111, Date: Personnel: Location: System Size: System Type: Vault Cast-In-Place Linear Catch Basin n Manhole❑ Other❑ .rr Date: Sediment Thickness in Forebay: Sediment Depth on Vault Floor: VIP Structural Damage: �.r Estimated Flow from Drainage Pipes(if available): ar Cartridges Submerged: Yes El No El Depth of Standing Water: irr StormFilter Maintenance Activities(check off if done and give description) Alp ❑Trash and Debris Removal: 'i` Minor Structural Repairs: �,. Drainage Area Report — Excessive Oil Loading: Yes El No Source: 'r I Sediment Accumulation on Pavement: Yes n No Source: Erosion of Landscaped Areas: Yes J No LJ Source: wr Items Needing Further Work: Owners should contact the local public works department and inquire about how the department disposes of their street waste residuals. vr. Other Comments: WSW rr .rr � ®rr ar .r 160, Air +r yr► wr � A,�ii�uTCAV® %►∎:11 • STORMWATER .. - ,- LUTIO S... *sr .r° Review the condition reports from the previous inspection visits. StormFilter Maintenance Report +rr Date: Personnel: AMY Location: System Size: System Type: Vault ❑ Cast-In-Place ❑ Linear Catch Basin❑ Manhole ❑ Other❑ List Safety Procedures and Equipment Used: IOW System Observations Months in Service: Aro Oil in Forebay: Yes ❑ No Sediment Depth in Forebay: I Sediment Depth on Vault Floor: w Structural Damage: w+ I Drainage Area Report Excessive Oil Loading: Yes ❑ No❑ Source: I Sediment Accumulation on Pavement: Yes ❑ No ❑ Source: I `ir Erosion of Landscaped Areas: Yes ❑ No ❑ Source: I ar StormFilter Cartridge Replacement Maintenance Activities +'' Remove Trash and Debris: Yes ❑ No ❑ Details: Replace Cartridges: Yes ❑ No ❑ Details: I — Sediment Removed: Yes ❑ No ❑ Details: Quantity of Sediment Removed(estimate?): Minor Structural Repairs: Yes ❑ No ❑ Details: law 411, Residuals(debris,sediment)Disposal Methods: mgr Notes: I +ar .r I .r ar, Tcwu® A��li th,q% EA;n I STORMWATER SOLUTIONSN�. 10 VIr ,1111,. STORM DRAIN COMPUTATIONS IOW 1111 RUNOFF COEFFICIENT CALCULATIONS vir Inlet# Total A Impery Cl Pery C2 C 2A 0.18 0.16 0.90 0.02 0.40 0.84 Air 2B 0.32 0.32 0.90 0.00 0.40 0.90 4 0.42 0.37 0.90 0.05 0.40 0.84 6 0.70 0.62 0.90 0.08 0.40 0.84 8 0.25 0.00 0.90 0.25 0.40 0.40 vir 25 0.37 0.32 0.90 0.05 0.40 0.83 26 0.23 0.23 0.90 0.00 0.40 0.90 21 0.27 0.00 0.90 0.27 0.40 0.40 ftr Aar Amy Air«.r (Imperv. Area*C1)+(Perv. Area*C2) C= Total Area r ler Air No. vity AEI *NW �r• ti.. 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O) a) N- y V CO N U w ► 61 C) 6) N- C0O r) Q) a) C) N CD V U) N VW O CI y V D V co 1---- CD CO CO V V 00 Vr 1-w -U. '- O '- T '- V '- T. Cn mow C4= L r` O O 00 CO 0 O 01 3- r• r` C/) Z"' . C) O O r) M M O (-6 0 0 CO >- r _ O �' = r` CO O CO r• r jC c' O O CV N O O O 0 O 11 Co N O O N (N N O N I` 0 0 'O U O I- VI, C O O O O O O O O O O O CO. O C E O O O O — O O O O CO CO C VII 0 N o O CO O O co co co O 0 N- T C) CC `® N 0 0 N N O 0 O CO O F O O T. a- — O '- O O O Crj 2 N- 0 'W Q .- O O O O N 0 O O O N- 6) *a C 0 0 0 0 N 0 0 0 0 CO CU O O O O O O O O O O O O +fir O o C d (� O O O O O O O O O 0 CO O O O O V O O O O CO CO E + mew CC c) O O O O O O O O O O O C!1 a) Cti N — C E F G V m v O O O O O 0 O O O O 0 CO 0 0 CO CO N O N N N 0 (U H 5- O O 5- O e- O O C C 446. L c \Y m ` V O O O O LO O O O O O CO 0 O rC 0 C-2.- 0 O O O LO O 0 O O N O O O O O O O O O O O N co 0 O O O O 11 Amy Cl) co c O O O O N O 0 0 O o N CO 0 N N- N. CC) N C _ N VI E !L C E C C a U — �, o H J w v In CD CO C) CO vi co m a 4 c ,o ,- air J N C7 V Cc) 0 r• CO O) Z VI Vi Vb Full Flow Capacity of 9-EX19(24" RCP) .u.a, -fir.;x�;.r.°:_x,r,:fai`:<w fiTait':<nc......,.x,,":W:... _ _ _ _ _..•t•' _ - _ __ -.}_.. ;:.y':' _ Fr0165t Description '"" Friction Method Manning Formula Solve For Full Flow Capacity ®► Input Data.=. ., a. „ Roughness Coefficient 0.013 ,r, Channel Slope 0.22200 ft/ft Normal Depth 2.00 ft Diameter 2.00 ft «sr Discharge `106.58 ft'/s, Air Discharge 106.58 ft'/s 'r► Normal Depth 2.00 ft Flow Area 3.14 ftz imp Wetted Perimeter 6.28 ft sr Top Width 0.00 ft Critical Depth 2.00 ft vas. Percent Full 100.0 % Critical Slope 0.21789 ft/ft err Velocity 33.93 ft/s 'o' Velocity Head 17.89 ft „r Specific Energy 19.89 ft Froude Number 0.00 Maximum Discharge 114.65 ft'/s Discharge Full 106.58 ft'/s r Slope Full 0.22200 ft/ft Flow Type SubCritical "GVF Input bat? _ ' •-. 'v.t-.—[-r-.eir.—::v.,.CI i r.<.... ., _ ... ....f w>...e .4-. J ... ..... ....r_ ..i.T r. Mir Downstream Depth 0.00 ft Length 0.00 ft ar Number Of Steps 0 GVF Output Data Aar Upstream Depth 0.00 ft +rr Profile Description ++� Profile Headloss 0.00 ft Average End Depth Over Rise 0.00 % Normal Depth Over Rise 100.00 % wr. Bentley Systems,Inc. Haestad Methods Solution Center Bentley FlowMaster [08.01.066.00] 11/11/2008 10:25:38 AM 27 Slemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-755-1666 Page 1 of 2 ar, wr wr VI NV Vir Full Flow Capacity of 9-EXI9(24" RCP) Nor Downstream Velocity Infinity ft/s low Upstream Velocity Infinity ft/s Normal Depth 2.00 ft *ow Critical Depth 2.00 ft Channel Slope 0.22200 ft/ft -411, Critical Slope 0.21789 ft/ft 401, 44IW 4111 ,41W 1111/ ass* 41111, .11Ir 1111W Ail Ilr AEI Mir 4111, 111, IMF iwr Bentley Systems,Inc. 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(with or without an emergency spillway) Project Cisoo3Y1 Bmv3 k i \ Pay}s S. 5 ti ce, Bu.‘1(1 M"` Basin # Location Cha1tottesv11I1e) \I A Total area draining to basin: j• 7- acres. vier l.. Basin Volume Design Wet Storage: ter 1. Minimum required volume = 67 cu. yds. x Total Drainage Area (acres). 67 cu. yds. x t• acres = y 3.9 cu. yds. 2. Available basin volume = cu. yds. at elevation 36g•2. (From storage - elevation curve) 3. Excavate 1\1-. g cu. yds. to obtain required volume*. * Elevation corresponding to required volume = invert of the dewatering .40 orifice. ivy 4. Available volume before cleanout required. w. 33 cu. yds. x (• - acres = 56. t cu. yds. 5. Elevation corresponding to cleanout level = 364. 0 . (From Storage - Elevation Curve) 6. Distance from invert of the dewatering orifice to cleanout level = t• 2 ft. •` (Min. = 1.0 ft.) lir ""' Dry Storage: 7. Minimum required volume = 67 cu. yds. x Total Drainage Area (acres). 67 cu. yds. x . 4- acres = t‘3•q cu. yds. ,�,. III - 112 Air w 1992 3.14 8. Total available basin volume at crest of riser* = 235-4, cu. yds. at .. elevation 310 . (From Storage - Elevation Curve) * Minimum = 134 cu. yds./acre of total drainage area. = 13y X I. �- — 224-. co. jds 9. Diameter of dewatering orifice = 2. in. 10. Diameter of flexible tubing = L1 in. (diameter of dewatering orifice plus 2 inches). .,, Preliminary Design Elevations 11. Crest of Riser = 3T0 .Q Top of Dam = 3' -3 . "' Design High Water = 3 l • 0 Upstream Toe of Dam = 365 . 0 Basin Shape 12. Length of Flow L = Li Li AMP Effective Width We I3 If > 2, baffles are not required '• If < 2, baffles are required Runoff 13. Q2 = cfs (From Chapter 5) IOW 14. Q25 = .G cfs (From Chapter 5) dOr Principal Spillway Design 15. With emergency spillway, required spillway capacity Op = Q2 = cfs. (riser and barrel) Without emergency spillway,required spillway capacity Q = Q25 = 14.5 cfs. (riser and barrel) I1I - 113 ler 1. w.. .� 1992 3.14 16. With emergency spillway: ( N I A) Assumed available head (h) = ft. (Using Q2) '4` h = Crest of Emergency Spillway Elevation - Crest of Riser Elevation Without emergency spillway: •w Assumed available head (h) = ft. (Using Q25) h = Design High Water Elevation - Crest of Riser Elevation .,, 17. Riser diameter (Dr) =r in. Actual head (h) = ft. (From Plate 3.14-8.) (°S 6 .X�S� � S uCk tkr6°. d.t.7 iY i05%QY• COnt'So\) Note: Avoid orifice flow conditions. 18. Barrel length (1) = 1 VC ft. Head (H) on barrel through embankment = 23•( ft. (From Plate 3.14-7). 19. Barrel diameter = Li2 in. gCP (05e ex;ski 9 re) (From Plate 3.14-B [concrete pipe] or Plate 3.14-A [corrugated pipe]). 20. Trash rack and anti-vortex device .► Diameter = 42. inches. Height = 2.1 inches. (From Table 3.14-D). Emergency Spillway Design ( /A) 21. Required spillway capacity Qe = 025 - Qp = cfs. vir 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). . .• • III - 114 1992 3.14 vir Anti-Seep Collar Design Car P) 23. Depth of water at principal spillway crest (Y) = ft. Slope of upstream face of embankment (Z) = _ ;1• Slope of principal spillway barrel (Sb) = Length of barrel in saturated zone (LS) = ft. 24. Number of collars required = dimensions = (from Plate 3.14-12). Final Design Elevations 25. Top of Dam = 313 .0 Design High Water = X4.1 • 0 Emergency Spillway Crest = N I A Principal Spillway Crest = 33-0,0 Dewatering Orifice Invert = 3 f, • 2. Cleanout Elevation = 3 6 •O- Ay Elevation of Upstream Toe of Dam or Excavated Bottom of"Wet Storage Area" (if excavation was performed) = 3S. 0 • Air 115 mar Pond Report Hydraflow Hydrographs by Intelisolve Friday, Nov 14 2008, 1:38 PM .r Pond No. 1 - Basin#1 -• Pond Data ,,.r Pond storage is based on known contour areas.Average end area method used. "a' Stage 1 Storage Table go, Stage(ft) Elevation(ft) Contour area(sqft) Incr.Storage(cuft) Total storage(cuft) 0.00 365.00 557 0 0 1.00 366.00 803 680 680 2.00 367.00 1,083 943 1,623 'my 3.00 368.00 1,396 1,240 2,863 • 4.00 369.00 1,743 1,570 4,432 11" 5.00 370.00 2,123 1,933 6,365 6.00 371.00 2,336 2,230 8,595 vir 7.00 372.00 2,983 2,660 11,254 8.00 373.00 3,454 3,219 14,473 air Culvert/Orifice Structures Weir Structures [A] [B] [C] [D] [A] [B] [C] [D] Rise(in) = 0.00 0.00 0.00 0.00 Crest Len(ft) = 0.00 0.00 0.00 0.00 mew Span(in) = 0.00 0.00 0.00 0.00 Crest El.(ft) = 0.00 0.00 0.00 0.00 v, No.Barrels = 0 0 0 0 Weir Coeff. = 0.00 0.00 0.00 0.00 Invert El.(ft) = 0.00 0.00 0.00 0.00 Weir Type = --- -- --- -- - Length(ft) = 0.00 0.00 0.00 0.00 Multi-Stage = No No No No Slope(%) = 0.00 0.00 0.00 0.00 ier N-Value = .000 .000 .000 .000 Air Orif.Coeff. = 0.00 0.00 0.00 0.00 Multi-S tage = n/a No No No ExfiItration= 0.000 in/hr(Wet area) Tailwater Elev.= 0.00 ft Mir Note:Culvert/Orifice outflows have been analyzed under inlet and outlet control .■r. Stage I Storage I Discharge Table Stage Storage Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Ell Total °er ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs Aa' 0.00 0 365.00 --- --- --- --- -- --- --- --- --- 0.00 1.00 680 366.00 --- --- --- --- --- --- --- --- --- 0.00 yew 2.00 1,623 367.00 --- --- --- --- --- --- --- --- --- 0.00 3.00 2,863 368.00 --- --- -- --- --- -- --- --- --- 0.00 my 4.00 4,432 369.00 -- --- --- --- -- -- -- --- --- 0.00 5.00 6,365 370.00 --- --- --- --- --- --- --- --- --- 0.00 ' mal. 6.00 8,595 371.00 --- --- --- --- --- --- -- --- --- 0.00 , 7.00 11,254 372.00 --- --- --- --- --- --- --- -- --- 0.00 ' AIM 8.00 14,473 373.00 -- --- --- -- --- --- --- - -- 0.00 yr .rr wr 4110 ASP VW VW AlIr . wr MP VW Nor I wr mr mr AK BMW SERVICE CENTER VW POST-DEVELOPED Albemarle County, Virginia Hydrograph Peak/Peak Time Table wr► Sub-Area Peak Flow and Peak Time (hr) by Rainfall Return Period air or Reach 25-Yr Identifier (cfs) v. (hr) r, SUBAREAS POST-DEVEL 14.47 11.93 low mow REACHES ww OUTLET 14.47 mot VW AW AW VW VW AW wr AW VW VW VW VW VW VW AW AW Vs AW A V, WinTR-55, Version 1.00.00 Page 1 11/14/2008 1:35:43 PM mw AV ar VW VW VW VP VW AK BMW SERVICE CENTER moo POST-DEVELOPED Albemarle County, Virginia VW .w+ Sub-Area Time of Concentration Details V` Sub-Area Flow Mannings's End Wetted Travel Identifier/ Length Slope n Area Perimeter Velocity Time Air (ft) (ft/ft) (sq ft) (ft) (ft/sec) (hr) - POST-DEVEL SHEET 47 0.0260 0.011 0.009 +r SHALLOW 64 0.4530 0.050 0.002 - CHANNEL 235 5.000 0.013 yr Time of Concentration 0.100 mw err rr mw mw mw s mw err rr rr VW VP VW VW VW VW VW VW VW VW VW VW Air +rr WinTR-55, Version 1.00.00 Page 1 11/14/2008 1:35:53 PM ar my VW AW ,r vw AK BMW SERVICE CENTER ler POST-DEVELOPED Albemarle County, Virginia Sub-Area Land Use and Curve Number Details vir wr Sub-Area Hydrologic Sub-Area Curve Identifier Land Use Soil Area Number `r Group (ac) ® POST-DEVELNewly graded area (pervious only) D 1.7 94 air Total Area / Weighted Curve Number 1.7 94 wW 'qtr VW MI MW MW VW VW VW VW VW MI VW VW VW VW Vw VW wr .ter VI VW VW VW VW M+'` WinTR-55, Version 1.00.00 Page 1 11/14/2008 1:36:00 PM mw v. are BASIN#1 �• CALCULATION FOR DIAMETER OF THE DEWATERING ORIFICE Q= S / 21,600 CFS S =Total storage available in dry storage area = 118.1cuyd =3,189 cu f t Q = 3,189 / 21,600=0.15 cis h = Maximum head possible =371 — 370= 1 feet A= Q / (64.32xh/2)"2 (0.6) =0.15 / (64.32 x 1/2)1' (0.6) =0.04 sq ft d =2 (A/3.14)12 =2 (0.04 / 3.14)"2 =0.23 ft = 2.76 inch Take d = 2 inch «• Diameter of flexible tubing = 2 +2 =4 inch IOW IOW ..r S=D 1V= BASI\ SC-=MATIC L-VATIO\S imr WOW CREST OF EMERGENCY SPILLWAY .r DESIGN NIGH WATER (25—YR. STORM ELEV.) li low MIN. 1.0 w► ' MIN. L 0.5 vow O' t } mms RISER CREST 67 C.Y./ AC. �.— . " DRY " STORAGE DEWATERING v %Kg DEVICE 67 C.Y./ AC. + ' WET " STORAGE ...,..::...•MOP .. ✓r SEDIMENT CLEANOUT POINT .r. ( " WET " STORAGE REDUCED TO 34 C.Y./ ACRE) DESIG\ ELEVATIONS WITH ®r EMERGE\CY SPILLWAY ,., 373.0 DESIGN MGN WATER ""' (25—YR. STORM ELEV.) MIN. 2.0' y 371.0 i MIN. 3.0' MIN. O.5'1 MIN. 1.0' 370.0 67 C.Y./ AC. DRY " STORAGE Mill w IIC! RISER CREST 67 C.Y./ AC. ""' " WET " STORAGE DEWATERING •.r DEVICE (368.2) ,— 365.0 .... SEDIMENT CLEANOUT POI T (367.0) mor DESIGN ELEVATIONS WITI-TOUT EMERGENCY SPILLWAY (RISER PASSES 25-YR. EVENT) "'OW SOURCE: VA. DSWC PLATE. 3.14-2 ®r S. ior vow RECOMMENDED DEWATERING SYSTEM FOR SEDIMENT BASINS "" PROVIDE ADEQUATE Ar STRAPPING ..OLYETHYLENE CAP 3695 Asir I.. I a.. 4' DIA. DEPTH +r. TACK WELD VARIES AS PERFORATED POLYETHYLENE FEQUIRED E FOR` DRY .ow DRAINAGE TUBING, DIAMETER STORAGE VARIES (SEE CALCULATIONS IN APPENDIX 3.I4-A) T DIA. - 368.2 WET • FERNCO-STYLE COUPLING STORAGE is. ler / DEWATERING ORIFICE, SCHEDULE 40 STEEL STUB I-FOOT MINIMUM, DIAMETER VARIES (SEE CALCULATIONS IN CORRUGATED METAL RISER APPENDIX 3.I4-A) NOTE= DEWATERING DEVICE TO BE INSTALLED DURING EROSION «r CONTROL PHASE. UPON COMPLETION OF EROSION CONTROL, CONTRACTOR SHALL REMOVE DEWATERING DEVICE AND PLUG — THE HOLE MADE DURING INSTALLATION OF DEWATERING DEVICE. Air NOTE= WITH CONCRETE RISER, USE PVC SCHEDULE 40 STUB „w FOR DEWATERING ORIFICE s DRAINAGE TUBING SI-TALL COMPLY WITH ASTM F667 AND AASHTO M294 `wr SOURCE: VA. DSWC PLATE. 3.14-15 imp v. 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