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Report OFFICE COPY AA I afghan associates,inc. ENGINEERING • Kiddie Academ - Ti and STORM WATER REPORT & CALCULATIONS 16145 Upper Boones Ferry Rd Tigard, Oregon siszozi - 00001 1 � 2p24 Ecs - GPRO C'V O Gp1V\S\0 gU1\10\N OWN wi Ci i f c • I PR S:613')1 Revised December 6th, 2020 Revised November 16th, 2020 May 21th, 2020 The information contained in this report was prepared by and under direct supervision of the undersigned: Craig Harris, PE AAI Engineering 4875 S.W. Griffith Drive Suite 300 Beaverton, Oregon 97005 PH 503.620.3030 FX 503.620.5539 johnm@aaieng.com AAI Project Number: A20043.11 ;e. l /1 I afghan associates,inc. • ENGINEERING Kiddie Academ - Ti • ard STORMWATER REPORT & CALCULATIONS 16145 Upper Boones Ferry Rd Tigard, Oregon • i C'I ij��A4A r9 N KS,tot arr'. 54 1 ) E tal •, ae.o N.` t <y 75.. ,,r' t' I, rrfr«:`.&1KW `.( 1 Revised December 6th, 2020 Revised November 16th, 2020 May 21th, 2020 The information contained in this report was prepared by and under direct supervision of the undersigned: Craig Harris, PE AAI Engineering 4875 S.W. Griffith Drive Suite 300 Beaverton, Oregon 97005 PH 503.620.3030 FX 503.620.5539 johnm@aaieng.com AAI Project Number: A20043.11 • KIDDIE ACADEMY - TIGARD Table of Contents I. Project Summary 3 II. Stormwater Design 3 ill. Operations and Maintenance 4 IV. Engineering Conclusion 4 Appendices Appendix A Existing Conditions Appendix B Hardscape Plan Appendix C Utility Plans Appendix D Conveyance Calculations Appendix E HydroCAD Calculations Appendix E Operations and Maintenance • 2 KIDDIE ACADEMY - TIGARD I. Project Summary The proposed project is located at 16145 SW Upper Boones Ferry Road in Tigard, Oregon. The total site area is approximately 53,810 SF and the existing site is predominantly hard packed gravel. See Appendix A— Existing Conditions. The onsite project will consist of the construction of a 10,682 SF building, 20,412 SF of AC parking with associated pedestrian pathways and utilities. The post construction site will contain 37,141 sf of impervious area and 16,669 sf of landscaping. Offsite public frontage improvements are planned on the northwest side of SW Upper Boones Ferry. The improvements include the relocation of a curb and a public sidewalk. See Appendix B — Hardscape Plan. Water quality systems will also be constructed to manage runoff from proposed building and proposed parking areas and sidewalks. The stormwater management required for this project will be designed according to the requirements outlined in the "Design and Construction Standards" by Clean Water Services, dated April 2019. See Appendix C — Utility Plans. • Onsite stormwater management is achieved through Peak Flow Match Detention per section 4.08.6 through the use of detention piping and a flow control manhole. See Appendix D— Conveyance Calculations See Appendix E — Hydro CAD Calculations II. Stormwater Design The site is a medium sized project (more than 12,000 SF but less than 80,000 SF), is in Development Class "Developed" and Risk Level "Medium" as it ultimately discharges into Fanno Creek which is a medium risk receiveing water body at the point of discharge and for a distance greater than a '/4 mile downstream. This project is a category 2 and therefore we chose to meet Peak Flow Matching Detention per Section 4.08.6.c. Stormwater management will be accomplished through the use of roof drains and catch basins that then lead to 600 LF of 48" CMP pipe and a flow control manhole. Through this method, runoff from the improved site will be matched to the same or lower rates when compared to the existing site. See Appendix C — Utility Plan. • 3 KIDDIE ACADEMY - TIGARD • III. Operation and Maintenance See Appendix F— Operation and Maintenance. IV. Engineering Conclusion Based on the requirements of the Clean Water Services R&O 17-05 "Design and Construction Standards", the proposed site facilities are adequately designed to manage the proposed development conditions • 1111/ Project Name: Kiddie Academy Tigard Design Frequency: 25yr Designed By: NWS Date: 12.04.2020 Project#: A20043.10 Checked By: CNH Time of Min. Capacity Velocity Total Total Time Average Flow Upstream downstream Runoff Equiv Concept of Rainfall Design IE(in) IE(out) PipeInvert Pipe Size Flowing Flowing Drainage Length Time Structure Structure Area Area Coeff. Area g Or Flow Discharge g Full Full Area Time Concept. IntensitySlope (A) (A) (c) (CA) (CA) (t) (T) (I) (Q) (L) (s) (D) (Q) (V) (t) sqft acres acres acres min min inihr cfs ft ft ft % in cfs fps min SFCB-01 212 1655.28 0.038 0.90 0.034 0.034 5.0 5.0 3.40 0.116 138.21 136.89 202.63 0.7% 6 0.45 2.31 1.5 CB-01 SFCB-02 1437.48 0.033 0.90 0.030 0.030 5.0 5.0 3.40 0.101 142.13 141.71 44.00 1.0% 6 0.55 2.80 0.3 SFCB-02 212 5270.76 0.121 0.90 0.109 0.109 5.0 5.0 3.40 0 370 141.71 136.89 21.66 22 3% 6 2.65 13.51 0.0 212 DETENTION 6926.04 0.159 0.90 0.143 0.143 5.0 5.0 3.40 0.487 136.89 136.44 70.12 0.7% 8 0.98 2 80 0 4 RD-01 195 1810.17 0.042 0.90 0.037 0.037 5.0 5.0 3.40 0.127 143.20 140.95 82.73 2.7% 6 0.93 4.72 0.3 RD-02 195 1810.17 0.042 0.90 0.037 0.037 5.0 5.0 3.40 0.127 143.20 140.95 2.00 112.5% 6 5.96 30.37 0.0 195 198 3620.34 0.083 0.90 0.075 0.075 5.0 5.0 3.40 0 254 140.95 138.93 74.55 2.7% 6 0.93 4.71 0.3 RD-03 198 1810.17 0.042 0.90 0.037 0.037 5.0 5.0 3.40 0 127 143.20 138.93 2.00 213.5% 6 8.22 41.84 0.0 198 WQMH-01 5430.51 0.125 0.90 0.112 0.112 5.0 5.0 3.40 0.381 138.93 137.11 66.93 2.7% 6 0.93 4.72 0.2 RD-04 206 1810.17 0,042 0.90 0.037 0.037 5.0 5.0 3.40 0.127 143.20 139.21 130.72 3 1% 6 ` 0.98 5.00 0.4 RD-05 206 1810.17 0.042 0.90 0.037 0.037 5.0 5.0 3.40 0.127 143.20 139.21 2.00 199.5% 6 7.94 40.44 0.0 206 207 3620.34 0.083 0.70 0.058 0.058 5.0 5.0 3.40 0.198 139.21 138.45 24.65 3.1% 6 0.99 5.0 RD-06 207 1810.17 0,042 0.90 0 037 0.037 5.0 5.0 3.40 0 127 143.20 138.45 2.00 237 5% 6 8.66 44.13 0,0 207 WQMH-01 5430.51 0.125 0.90 0.112 0.112 5.0 5.0 3.40 0.381 138.45 137.11 13.47 9 9% 6 1.77 9.03 0 0 WQMH-01 DETENTION 10861.02 0.249 0.90 0.224 0.224 5.0 5.0 3.40 0.763 137.40 136.43 18.04 5.4% 6 1.30 6.64 0.0 CB-02 214 4617.36 0.106 0.90 0.095 0.095 5.0 5.0 3.40 0.324 142.88 142.18 70.83 1.0% 6 0.56 2.85 0 4 CB-03 214 3397.68 0.078 0.70 0.055 0.055 5.0 5.0 3.40 0.186 142.34 142.18 16.79 1 0% 6 0.55 2.80 0.1 214 SFCB-03 8015.04 0.184 0.90 0.166 0.166 5.0 5.0 3.40 0.563 142.18 141.67 52.01 1.0% 8 1.20 3.44 0.3 SFCB-03 DETENTION 10323.72 0.237 0.90 0.213 0.213 5.0 5.0 3.40 0.725 141.67 136.86 25.53 18 8% 8 5.26 15.06 0.0 DETNETION FCMH-01 28110.78 =0.645 0.90 0.581 0.581 5.0 5.0 3,40 1_975 134.43 134.30 18.11 0,7% 12 3.03 3.85 0.1 FCMH-01 MAIN 28110.78 0.645 0.90 0.581 0.581 5,0 5.0 3.40 1.975. 134.30 133.92 76.48 0 s% 12 2.52 3.20 0.4 Page 1 • • • < Is > Pre-developed Conditions • 2S h 1 P Post-developed 48" CMP Conditions ubcat Reach Pon Link Routing Diagram for Kiddie Academy Tigard • { Prepared by AAI Enginering Inc., Printed 11/17/2020 HydroCAD®10.00-26 sin 01638 ©2020 HydroCAD Software Solutions LLC Kiddie Academy Tigard • Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCADO 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 1.235 75 Ex Conditions (1S) 0.355 98 Existing roof (2S) 0.989 98 Roof, Paved parking, Concrete HSG B (2S) 2.580 87 TOTAL AREA • • Kiddie Academy Tigard Type IA 24-hr 2yr Rainfall=2.50" Prepared by AAI Enginering Inc. Printed 11/17/2020 • HydroCAD® 10.00-26 sin 01638 ©2020 HydroCAD Software Solutions LLC Page 3 Time span=0.00-25.00 hrs, dt=0.05 hrs, 501 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Pre-developed Runoff Area=53,810 sf 0.00% Impervious Runoff Depth=0.65" Tc=5.0 min CN=75 Runoff=0.13 cfs 0.067 af Subcatchment 2S: Post-developed Runoff Area=58,557 sf 100.00% Impervious Runoff Depth=2.27" Tc=5.0 min CN=98 Runoff=0.79 cfs 0.254 af Pond 1P: 48" CMP Peak Elev=138.05' Storage=7,100 cf Inflow=0.79 cfs 0.254 af Outflow=0.06 cfs 0.096 af Total Runoff Area = 2.580 ac Runoff Volume=0.321 af Average Runoff Depth = 1.49" 47.89% Pervious= 1.235 ac 52.11% Impervious= 1.344 ac • • Kiddie Academy Tigard Type IA 24-hr 2yr Rainfall=2.50" Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 4 Summary for Subcatchment 1S: Pre-developed Conditions Runoff = 0.13 cfs @ 8.00 hrs, Volume= 0.067 af, Depth= 0.65" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.05 hrs Type IA 24-hr 2yr Rainfall=2.50" Area (sf) CN Description 53,810 75 Ex Conditions 53,810 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, 5 Subcatchment 1S: Pre-developed Conditions Hydrograph ®Ru O.1d;J - Runoff (owdsl 0.13r Type IA 24-hr410 .. 0.,2 2yr Rainfall=2.50" 0.117 Runoff Area=53,810 sf n.o9a Runoff Volume=0.067 af 04 Runoff Depth=0.65" 007 Tc=5.0 min o � r4 .i, WIW GN=75 003 0.0z' 001_ - .r If5f. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hours) • Kiddie Academy Tigard Type IA 24-hr 2yr Rainfall=2.50" 0 Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 6 Summary for Pond 1 P: 48" CMP . Inflow Area = 1.344 ac,100.00% Impervious, Inflow Depth = 2.27" for 2yr event Inflow = 0.79 cfs @ 7.86 hrs, Volume= 0.254 af Outflow = 0.06 cfs @ 23.98 hrs, Volume= 0.096 af, Atten= 92%, Lag= 967.0 min Primary = 0.06 cfs @ 23.98 hrs, Volume= 0.096 af Routing by Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.05 hrs Peak Elev= 138.05' @ 24.00 hrs Surf.Area= 1,487 sf Storage= 7,100 cf Plug-Flow detention time= 526.2 min calculated for 0.096 af (38% of inflow) Center-of-Mass det. time= 225.9 min ( 897.8- 671.9 ) Volume Invert Avail.Storage Storage Description #1 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 '/' #2 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 'I' #3 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003'/' #4 134.54' 1,508 cf 48.0" Round Pipe Storage L= 120.0' S= 0.0003 '1 • 7,540 cf Total Available Storage Device Routing Invert Outlet Devices #1 Primary 134.30' 1.1" Horiz. 2yr C= 0.600 Limited to weir flow at low heads #2 Primary 138.05' 12.0" Horiz. 5yr, 10yr, Emergency Overflow C= 0.600 Limited to weir flow at low heads rimary OutFlow Max=0.06 cfs @ 23.98 hrs HW=138.05' (Free Discharge) 1=2yr (Orifice Controls 0.06 cfs @ 9.33 fps) 2=5yr, 10yr, Emergency Overflow (Weir Controls 0.00 cfs © 0.11 fps) • Kiddie Academy Tigard Type IA 24-hr 2yr Rainfall=2.50" Prepared by AAI Enginering Inc. Printed 11/17l2020 HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 7 • Pond 1 P: 48" CMP Hydrograph ®Inflow 085 o�as ®Primary 03. Inflow Area=1.344 ac D75 ;_..Peak-Elev=138.05' 065 Storage=7,100 cf O6. 0.55: ... 0.5^ u - 0 45 0.4-7 0.35 .... 02: 01 05 %/!!//���z //i.�f,00:e�Js�r eer4Wet9//s007,4 t/07:,e%�i/./®./i/r✓/.�1�.�/ / 0 1 2 3 4 5 6 7 8 9 1D 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hours) • • Kiddie Academy Tigard Type IA 24-hr 5yr Rainfall=3.10" Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 8 Time span=0.00-25.00 hrs, dt=0.05 hrs, 501 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Pre-developed Runoff Area=53,810 sf 0.00% Impervious Runoff Depth=1.03" Tc=5.0 min CN=75 Runoff=0.25 cfs 0.106 of Subcatchment 2S: Post-developed Runoff Area=58,557 sf 100.00% Impervious Runoff Depth=2.87" Tc=5.0 min CN=98 Runoff=0.99 cfs 0.321 of Pond 1P: 48" CMP Peak Elev=138.09' Storage=7,161 cf Inflow=0.99 cfs 0.321 af Outflow=0.16 cfs 0.163 af Total Runoff Area= 2.580 ac Runoff Volume=0.427 af Average Runoff Depth= 1.99" 47.89% Pervious= 1.235 ac 52.11% Impervious= 1.344 ac Kiddie Academy Tigard Type IA 24-hr 5yr Rainfall=3.10" Prepared by AAI Enginering Inc. Printed 11/17/2020 • HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment 2S: Post-developed Conditions Runoff = 0.99 cfs @ 7.86 hrs, Volume= 0.321 af, Depth= 2.87" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.05 hrs Type IA 24-hr 5yr Rainfall=3.10" Area (sf) CN Description 43,075 98 Roof, Paved parking, Concrete HSG B 15,482 98 Existing roof 58,557 98 Weighted Average 58,557 100,00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: Post-developed Conditions / Hydrograph fi ®Runoff 1 .. 1999 cis " Type IA 24-hr 5yr Rainfall=3.10" Runoff Area=58,557 sf Runoff Volume=0.321 af Runoff Depth=2.87" Tc=5.0 min CN=98 so- o0 0 1 2 3 4 5 6 7 6 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hours) • Kiddie Academy Tigard Type IA 24-hr 5yr Rainfall=3.10" Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCADO 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 11 Summary for Pond 1 P: 48" CMP Inflow Area = 1.344 ac,100.00% Impervious, Inflow Depth = 2.87" for 5yr event Inflow = 0.99 cfs @ 7.86 hrs, Volume= 0.321 af Outflow = 0.16 cfs @ 12.55 hrs, Volume= 0.163 af, Atten= 84%, Lag= 281.4 min Primary = 0.16 cfs @ 12.55 hrs, Volume= 0.163 af Routing by Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.05 hrs Peak Elev= 138.09' @ 12.55 hrs Surf.Area= 1,421 sf Storage= 7,161 cf Plug-Flow detention time= 516.5 min calculated for 0.163 af(51% of inflow) Center-of-Mass det. time= 253.1 min ( 918.5 -665.4 ) Volume Invert Avail.Storage Storage Description #1 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 '/' #2 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 '/' #3 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 '/' #4 134.54' 1,508 cf 48.0" Round Pipe Storage L= 120.0' S= 0.0003'/' 7,540 cf Total Available Storage • Device Routing Invert Outlet Devices #1 Primary 134.30' 1.1" Horiz. 2yr C= 0.600 Limited to weir flow at low heads #2 Primary 138.05' 12.0" Horiz. 5yr, 10yr, Emergency Overflow C= 0.600 Limited to weir flow at low rimary OutFlow Max=0.15 cfs @ 12.55 hrs HW=138.09' (Free Discharge) 1=2yr (Orifice Controls 0.06 cfs @ 9.38 fps) 2=5yr, 10yr, Emergency Overflow (Weir Controls 0.09 cfs @ 0.68 fps) Kiddie Academy Tigard Type IA 24-hr Syr Rainfall=3.10" Prepared by AAI Enginering Inc. Printed 11117l2020 • HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 12 Pond 1 P: 48" CMP Hydrograph 0 Inflow r r p o96 da ®Primary Inflow rc =1 .344 ac 1- *j' Peak Elea-138.09' h.` Storage=71 6i1 cf li o •• } LL 4 ar'srsF �?,d:-.°i;t.' r/ s //rri1�.1+e�°...___�:.�IA/ZdI#� i��a1.1. 17.%:..�.//� ���y a /.✓✓✓rjee011i'°r./�/��>'°f !l�s//sal'/ �, �,, _,... ,,..,, , ..�' ' , 21 .m.23 • 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time ihours) • Kiddie Academy Tigard Type lA 24-hr 10yr Rainfall=3.45" Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCAD® 10.00-26 sin 01638 ©2020 HydroCAD Software Solutions LLC Page 13 • Time span=0.00-25.00 hrs, dt=0.05 hrs, 501 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Pre-developed Runoff Area=53,810 sf 0.00% Impervious Runoff Depth=1.27" Tc=5.0 min CN=75 Runoff=0.33 cfs 0.130 af Subcatchment 2S: Post-developed Runoff Area=58,557 sf 100.00% Impervious Runoff Depth=3.22" Tc=5.0 min CN=98 Runoff=1.10 cfs 0.360 af Pond 1P: 48"CMP Peak Elev=138.11' Storage=7,191 cf Inflow=1.10 cfs 0.360 af Outflow=0.24 cfs 0.202 of Total Runoff Area= 2.580 ac Runoff Volume=0.491 af Average Runoff Depth =2.28" 47.89% Pervious = 1.235 ac 52.11% Impervious= 1.344 ac • 1110 Kiddie Academy Tigard Type IA 24-hr 10yr Rainfall=3.45" t Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCAD 10,00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 14 Summary for Subcatchment 1S: Pre-developed Conditions Runoff = 0.33 cfs @ 7.98 hrs, Volume= 0.130 af, Depth= 1.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.05 hrs Type IA 24-hr 10yr Rainfall=3.45" Area (sf) CN Description " 53,810 75 Ex Conditions 53,810 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, 5 Subcatchment 1S: Pre-developed Conditions Hydrograph _.. . . 034: i033dll 1 y. 032; .. . 24-hr Type IA • 03; 10yr Rainfall=3.45" 026. ,. _: Runoff Area=53,810 sf... 024 1Runoff VoIume=0.130 af 022, ... 02: - Runoff Depth=1.27" o,$ Tc=5,0 min oa � CN--75 0123 , 00s;' 0.04] 01 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hours) • Kiddie Academy Tigard Type IA 24-hr 10yr Rainfall=3.45" Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 15 • Summary for Subcatchment 2S: Post-developed Conditions Runoff = 1.10 cfs @ 7.86 hrs, Volume= 0.360 af, Depth= 3.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.05 hrs Type IA 24-hr 10yr Rainfall=3.45" Area (sf) CN Description 43,075 98 Roof, Paved parking, Concrete HSG B " 15,482 98 Existing roof 58,557 98 Weighted Average 58,557 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: Post-developed Conditions Hydrograph Q Runoff Type IA 24-hr • 10yr Rainfall=3.45" Runoff Area=58,557 sf Runoff Volume=0.360 af Runoff Depth=3.22" VA LL Tc=5.0 min CN=98 r�s 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hours) Kiddie Academy Tigard Type IA 24-hr 10yr Rainfall=3.45" • Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 16 Summary for Pond 1 P: 48" CMP Inflow Area = 1.344 ac,100.00% Impervious, Inflow Depth = 3.22" for 10yr event Inflow = 1.10 cfs @ 7.86 hrs, Volume= 0.360 af Outflow = 0.24 cfs @ 10.07 hrs, Volume= 0.202 af, Atten= 79%, Lag= 133.0 min Primary = 0.24 cfs @ 10.07 hrs, Volume= 0.202 af Routing by Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.05 hrs Peak Elev= 138.11' @ 10.07 hrs Surf.Area= 1,385 sf Storage=7,191 cf Plug-Flow detention time= 472.7 min calculated for 0.202 af(56% of inflow) Center-of-Mass det. time= 226.9 min ( 889.4-662.5) Volume Invert Avail.Storage Storage Description #1 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 '/' #2 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 '/' #3 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 '/' #4 134.54' 1,508 cf 48.0" Round Pipe Storage L= 120.0' S= 0.0003 'P • 7,540 cf Total Available Storage Device Routing Invert Outlet Devices #1 Primary 134.30' 1.1" Horiz. 2yr C= 0.600 Limited to weir flow at low heads #2 Primary 138.05' 12.0" Horiz. 5yr, 10yr, Emergency Overflow C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.23 cfs @ 10.07 hrs HW=138.11' (Free Discharge) t1=2yr (Orifice Controls 0.06 cfs @ 9.40 fps) 2=5yr, 10yr, Emergency Overflow (Weir Controls 0.17 cfs @ 0.83 fps) 9 Kiddie Academy Tigard Type IA 24-hr 10yr Rainfall=3.45" Prepared by AAI Enginering Inc. Printed 11/17/2020 • HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 17 Pond 1 P: 48" CMP / Hydrograph / J ElInflow i l i..on� ®Primary Inflow Area=1.344 ac Peak Elev=138.11' a: Storage=7,191 cf w �� s'y r. .�>' S'* a s .t+d's re ,��',.. te�rr'' Adiii .:14 0 1 2 3 4 5 fi 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hours) • 0 Kiddie Academy Tigard Type IA 24-hr 100yr Rainfall=4.50" • Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 18 Time span=0.00-25.00 hrs, dt=0.05 hrs, 501 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Pre-developed Runoff Area=53,810 sf 0.00% Impervious Runoff Depth=2.05" Tc=5.0 min CN=75 Runoff=0.58 cfs 0.211 af Subcatchment 2S: Post-developed Runoff Area=58,557 sf 100.00% Impervious Runoff Depth=4.26" Tc=5.0 min CN=98 Runoff=1.45 cfs 0.478 af Pond 1P: 48" CMP Peak Elev=138.22' Storage=7,332 cf Inflow=1.45 cfs 0.478 af Outflow=0.82 cfs 0.319 af Total Runoff Area= 2.580 ac Runoff Volume= 0.689 of Average Runoff Depth = 3.20" 47.89% Pervious= 1.235 ac 52.11%Impervious= 1.344 ac • • Kiddie Academy Tigard Type IA 24-hr 100yr Rainfall=4.50" Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 19 • Summary for Subcatchment 1S: Pre-developed Conditions Runoff = 0.58 cfs @ 7.97 hrs, Volume= 0.211 af, Depth= 2.05" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.05 hrs Type IA 24-hr 100yr Rainfall=4.50" Area (sf) CN Description 53,810 75 Ex Conditions 53,810 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, 5 Subcatchment 1S: Pre-developed Conditions Hydrograph 0.6- lauds 0.55 t Type IA 24-hr 05= 100yr Rainfall=4.50" 04$: Runoff Area=53,810 sf 04 Runoff Volume=0.211 af 035: Runoff Depth=2.05" 03. 0 Tc=5.0 min LL 025- :. 02 CN=75 0is, . 00$- (144 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 2425 Time (hours) • Kiddie Academy Tigard Type IA 24-hr 100yr Rainfall=4.50" ill Prepared by AAI Enginering Inc. Printed 11/17/2020 HydroCAD® 10.00-26 stn 01638 ©2020 HydroCAD Software Solutions LLC Page 20 Summary for Subcatchment 2S: Post-developed Conditions Runoff = 1.45 cfs @ 7.85 hrs, Volume= 0.478 af, Depth= 4.26" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.05 hrs Type IA 24-hr 100yr Rainfall=4.50" Area (sf) CN Description 43,075 98 Roof, Paved parking, Concrete HSG B * 15,482 98 Existing roof 58,557 98 Weighted Average 58,557 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (fUft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: Post-developed Conditions Hydrograph ®Runoff (las trii Type IA 24-hr 100yr Rainfall=4.50" IV Runoff Area 58,557 sf Runoff Volume=0.478 af Runoff Depth=4.26" LL Tc=5.0 min tv CN=98 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hours) • Kiddie Academy Tigard Type IA 24-hr 100yr Rainfall=4.50" Prepared by AA! Enginering Inc. Printed 11/17/2020 • HydroCAD® 10.00-26 s/n 01638 ©2020 HydroCAD Software Solutions LLC Page 21 Summary for Pond 1P: 48" CMP Inflow Area = 1.344 ac,100.00% Impervious, Inflow Depth = 4.26" for 100yr event Inflow = 1.45 cfs @ 7.85 hrs, Volume= 0.478 af Outflow = 0.82 cfs @ 8.18 hrs, Volume= 0.319 af, Atten= 44%, Lag= 19.8 min Primary = 0.82 cfs @ 8.18 hrs, Volume= 0.319 af Routing by Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.05 hrs Peak Elev= 138.22' @ 8.18 hrs Surf.Area= 1,176 sf Storage= 7,332 cf Plug-Flow detention time= 370.0 min calculated for 0.318 af (67% of inflow) Center-of-Mass det. time= 167.6 min (823.8 -656.2 ) Volume Invert Avail.Storage Storage Description #1 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 '1 #2 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 '/' #3 134.44' 2,011 cf 48.0" Round Pipe Storage L= 160.0' S= 0.0003 '/' #4 134.54' 1,508 cf 48.0" Round Pipe Storage L= 120.0' S= 0.0003 '/' 7,540 cf Total Available Storage 111/ Device Routing Invert Outlet Devices #1 Primary 134.30' 1.1" Horiz. 2yr C= 0.600 Limited to weir flow at low heads #2 Primary 138.05' 12.0" Horiz. 5yr, 10yr, Emergency Overflow C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.81 cfs @ 8.18 hrs HW=138.22' (Free Discharge) t1=2yr (Orifice Controls 0.06 cfs @ 9.54 fps) 2=5yr, 10yr, Emergency Overflow (Weir Controls 0.74 cfs @ 1.36 fps) • 1 Kiddie Academy Tigard Type IA 24-hr 100yr Rainfall=4.50" Prepared by AAI Enginering Inc. Printed 11/17/2020 • HydroCAD® 10.00-26 sin 01638 ©2020 Hy droCAD Software Solutions LLC Page 22 Pond 1 P: 48" CMP Hydrograph a Inflow sMs as a Primary Inflow Area-1 .344 ac Peak Elv=1 38.22' Storage=7,332 cf I i o 4'0- ..aidi 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hours) • Kiddie Academy - Tigard STORMWATER OPERATIONS & MAINTENANCE PLAN Kiddie Academy - Tigard December 06, 2020 Prepared by: Craig Harris AM Engineering 4875 SW Griffith Drive, Suite 300 Beaverton, OR 97005 Responsibility The Catchbasins, Conveyance Piping, Flow Control Manhole, Water Quality Manhole and Water Quality Filter Catchbasins are to be maintained by the owner. These facilities have been designed for ease of maintenance outlined herein. • Contact info: Primary: TBD Address: Tel: Email: Department of Environmental Quality - (503) 229-5696 Oregon Emergency Response System - (800)452-0311 Description The runoff from the roof and new asphalt/concrete will be collected in new downspouts (Roof) and catchbasins (AC). The runoff from the roof and paved surfaces will be routed through a 48" detention pipe facility prior to Flow Control and then to a Water Quality Filter Vault for treatment. • Kiddie Academy - Tigard • Facilities Description Table Facility Name Type Size (SF) Area Treated * IA Treated Discharge Point (SF) 48" Detention Detention 48"Dia. N/A N/A Existing Storm Piping CMP piping Flow Control Flow Manhole N/A N/A Existing Storm Manhole Control piping WQ Filter Water 3x Asphalt+ 17,2508SF Existing Storm Catchbasins Quality (1 cart ea.) Concrete (Total) piping WQ Manhole Water 60" Roof 10,682SF Existing Storm Quality W/3' sump piping * IA=Impervious Area • The Water Quality Filter Catchbasins will filter the runoff as it flows through engineered media cartridges. The Water Quality manhole will filter the runoff as it has a built-in sump to catch particulates and a baffle (snout)to trap floatable. There is a flow control riser installed in a Flow Control Manhole that restricts the release rate of the facility to jurisdictional rates. An emergency overflow is provided in the structure to allow the larger flow storms to drain out of the Detention Piping to avoid ponding or surcharging the upstream piping. Once treated the runoff is conveyed to an existing public storm main. Inspection/Maintenance Schedule Each part of the system shall be inspected and maintained quarterly and within 48 hours after each major storm event. For this O&M Plan, a major storm event is defined as 1.0 inches of rain (or more) in 24 hours. All components of the storm system as described above must be inspected and maintained frequently or they cease to function effectively. The Facility owner shall keep a log, recording all inspection dates, observations, and maintenance activities. Receipts shall be saved when maintenance is performed and there is record of expense The following items shall be inspected and maintained as stated: • Kiddie Academy - Tigard Catchbasins,Water Quality Manhole,Flow Control Manhole and Pipes (Conveyance and Detention): • Sediment shall be removed biannually, more frequently if site produces a high volume of sediment. • Debris shall be removed from inlets and outlets quarterly, or as necessary to maintain free flow of runoff. • Quarterly inspections for clogging shall be performed, or if"ponding" is observed at Catchbasin inlets. • Grates shall be tamper proof. Water Quality Filter Catchbasins: • See manufactures specific O&M manual (attached) Source Control • Source control measures prevent pollutants from mixing with stormwater. Typical non-structural control measures include raking and removing leaves, pavement sweeping, vacuum sweeping, and limited and controlled application of pesticides, herbicides and fertilizers. • Source control measures shall be inspected and maintained quarterly. • Signage shall be maintained. Spill Prevention Spill prevention measures shall be exercised when handling substances that can contaminate stormwater. Virtually all sites present dangers from spills. It is important to exercise caution when handling substances that can contaminate stormwater. Activities that pose the chance of hazardous material spills shall not take place near collection facilities. • The proper authority and property owner shall be contacted immediately if a spill is observed. • A spill kit shall be kept near spill-prone operations and refreshed annually. • Employees shall be trained on spill control measures. • Shut-off valves shall be tested quarterly. • Release of pollutants shall be corrected within 12 hours. Insects and Rodents • Insects and Rodents shall not be harbored in any part of the storm system. Kiddie Academy - Tigard • • Pest control measures shall be taken when insects/rodents are found to be present. Standing water and food sources shall be prevented. • Holes in the ground shall be filled. • Inlets and outfalls shall be inspected and cleaned regularly to ensure no rodent activity, which can clog or decrease the efficiency of the storm system. • Pest control measures shall be taken when insects/rodents are found to be present. Standing water and food sources shall be prevented. Access Access shall be maintained for the Catchbasins, Detention Piping, Flow Control Manhole and Water Quality Vault so operations and maintenance can be performed as regularly scheduled. • Kiddie Academy - Tigard Stormwater Facility Monitoring Log Pollution prevention • All sites shall implement best management practices (BMP's), to prevent hazardous wastes, litter, or excessive oil and sediment from contaminating stormwater. Record Time/Date, weather and site conditions if site activities are found to contaminate stormwater. Maintenance • Record date, description and contractor (if applicable) for all structure repairs, landscape maintenance and facility cleanout activities. Date: Initials: Work performed by: • Work performed: Details: Date: Initials: Work performed by: Work performed: Details: • CONTECH® OPERATION AND ENGINEERED SOLUTIONS MAINTENANCE A CatchBasin StormFilter" Important: These guidelines should be used as a part of your site stormwater plan. Overview The CatchBasin StormFilter' (CBSF) consists of a multi-chamber The concrete and plastic units operate similarly minus the steel, concrete, or plastic catch basin unit. The steel CBSF is presence of the inlet chamber or deep sump. offered both as a standard and as a deep unit for additional internal overflow and sediment capacity. Once in the cartridge chamber, polluted water ponds and percolates horizontally through the media in the filter cartridges. The CBSF is installed flush with the finished grade and is Treated water collects in the cartridge's center tube from where applicable for both constrained lot and retrofit applications. it is directed to the outlet chamber and discharged to the outlet Steel and concrete units can accept surface and piped influent pipe on the downstream side of the overflow weir. for roof leaders or similar applications. When influent flows exceed the water quality design value, The steel, concrete and plastic CBSF units have capacities of excess water spills over the overflow weir, bypassing the 4, 8 and 2 cartridges, respectively. Internal overflow capacity cartridge bay, and discharges to the outlet pipe. varies by system type from 0.5 cfs for the plastic, 1.3 cfs for the concrete and 1.0 or 1.8 cfs for the steel unit. Applications • The CBSF is particularly useful where small flows are being Design Operation treated or for sites that have little available hydraulic head. The The CBSF is installed as the primary receiver of runoff, similar unit is ideal for applications in which standard catch basins are to a standard, grated catch basin. The steel and concrete CBSF to be used. Both water quality and catchment issues can be units have an H-20 rated,traffic bearing lid that allows the filter resolved with the use of the CBSF. to be installed in parking lots, and for all practical purposes, takes up no land area. Plastic units can be used in landscaped areas or other non-traffic-bearing applications_ Retro-Fit The retrofit market has many possible applications for the CBSF. The CBSF can be installed by replacing an existing catch basin The steel CBSF consists of a sumped inlet chamber and without having to "chase the grade,"thus reducing the high cost cartridge chamber(s). Runoff enters the sumped inlet chamber of re piping the storm system. either by sheet flow from a paved surface or from an inlet pipe discharging directly to the unit vault. The inlet chamber is equipped with an internal baffle,which traps debris and floating oil and grease, and an overflow weir. While in the inlet chamber, heavier solids are allowed to settle into the deep sump, while lighter solids and soluble pollutants are directed into the cartridge chamber through a port between the baffle and the overflow weir. 0 Page 1 www.ContechES.com/stormwater 1800-338-1122 ©7020 Canlech Engineered Solutions,a Ouikrele Company C=::=NTECH® OPERATION AND ENGINEERED SOLUTIONS MAINTENANCE CatchBasin StormFilterTM Maintenance Guidelines Mosquito Abatement Maintenance procedures for typical catch basins can be applied In certain areas of the United States, mosquito abatement is to the CatchBasin StormFilter (CBSF). The filter cartridges desirable to reduce the incidence of vectors. contained in the CBSF are easily removed and replaced during maintenance activities according to the following guidelines. In BMPs with standing water, which could provide mosquito breeding habitat, certain abatement measures can be taken. 1. Establish a safe working area as per typical catch basin service activity. 1. Periodic observation of the standing water to determine if the facility is harboring mosquito larvae. 2. Remove steel grate and diamond plate cover (weight 100 lbs. each) or plastic grating. 2. Regular catch basin maintenance. 3. Turn cartridge(s) approximately '/a turn counter-clockwise to 3. Use of larvicides containing Bacillus thuringiensis israelensis disconnect from pipe manifold. (BTI). BTI is a bacterium toxic to mosquito and black fly larvae. 4. Remove cartridge(s)from catch basin by hand or with In some cases,the presence of petroleum hydrocarbons may appropriate hoisting equipment. interrupt the mosquito growth cycle. 5. Remove accumulated sediment via vactor truck from all interior chambers. b. Rinse interior of both bays and vactor remaining water and Using Larvicides in the CatchBasin StormFilter sediment. Larvicides should be used according to manufacturer's recommendations. 07. Install fresh cartridge(s), by rotating Y turn clockwise,taking Two widely available products are Mosquito Dunks and Summit care not to damage cartridge connectors. B.t.i. Briquets. For more information, visit https:/Ivrww.amvac. 8. Replace cover(s). cam/products/summit-bti-briquets. 9. Dispose of accumulated debris and spent media in The larvicide must be in contact with the permanent pool. The accordance with local regulations. larvicide should also be fastened to the CatchBasin StormFilter 10. Return used, empty cartridges to Contech for refurbishing. to prevent displacement by high flows.A magnet can be used Media may be removed from the filter cartridges using the with a steel catch basin. vactor truck before the cartridges are removed from the catch For more information on mosquito abatement in stormwater basin structure once the top cap and hood are removed. The BMPs, refer to the following: https•Uanrcofa) ycanredul vactor truck must be equipped with a hose capable of reaching pdf/8125.pdf. areas of restricted clearance. Empty cartridges can be easily removed from the catch basin structure by hand. Empty cartridges should be reassembled and returned to Contech as appropriate. Refurbished cartridges are available from Contech on an exchange basis. Contact the maintenance department of Contech at 513-645-7770 for more information. Onsite maintenance is estimated at 26 minutes once setup for a single cartridge unit. Add approximately 5 minutes for each additional cartridge. • Page 2 www.ContechES.com/stormwater ( 800-338-1122 2020 Conloch Engineered Solutions,a Quikreie Company C ioNTECH ENGINEERED SOLUTIONS StormFilter Inspection and Maintenance Procedures • F3 5\ r f • • The Stormwater Management Storm Filter Maintenance Guidelines In addition to these two activities,it is important to check the condition of the StormFilter unit after major storms for The primary purpose of the Stormwater ManagementStorm potential damage caused by high flows and for high sediment • waterways. isto filter and prevent pollutants from enteringly oure accumulation that may be caused by localized erosion in the waterways.Like any effective filtration system, periodically these drainage area.It may be necessary to adjust the inspection/ pollutants must be removed to restore the StormFilter to its full maintenance schedule depending on the actual operating efficiency and effectiveness. conditions encountered by the system. In general, inspection Maintenance requirements and frequency are dependent on the activities can be conducted at any time, and maintenance should pollutant load characteristics of each site. Maintenance activities occur, if warranted,during dryer months in late summer to early may be required in the event of a chemical spill or due to fall. excessive sediment loading from site erosion or extreme storms. It is a good practice to inspect the system after major storm events. Maintenance Frequency The primary factor for determining frequency of maintenance for Maintenance Procedures the StormFilter is sediment loading. Although there are many effective maintenance options,we A properly functioning system will remove solids from water by believe the following procedure to be efficient,using common trapping particulates in the porous structure of the filter media equipment and existing maintenance protocols.The following inside the cartridges.The flow through the system will naturally two-step procedure is recommended:: decrease as more and more particulates are trapped.Eventually 1. Inspection the flow through the cartridges will be low enough to require • Inspection of the vault interior to determine the need for replacement. It may be possible to extend the usable span of the maintenance, cartridges by removing sediment from upstream trapping devices on a routine as-needed basis,in order to prevent material from 2.Maintenance being re-suspended and discharged to the StormFilter treatment • Cartridge replacement system. • Sediment removal The average maintenance lifecycle is approximately 1-5 years. Inspection and Maintenance Timing Site conditions greatly influence maintenance requirements. At least one scheduled inspection should take place per year with StormFilter units located in areas with erosion or active fip maintenance following as warranted. construction may need to be inspected and maintained more often than those with fully stabilized surface conditions. First,an inspection should be done before the winter season. During the inspection the need for maintenance should be Regulatory requirements or a chemical spill can shift maintenance determined and, if disposal during maintenance will be required, timing as well.The maintenance frequency may be adjusted as samples of the accumulated sediments and media should be additional monitoring information becomes available during the obtained. inspection program.Areas that develop known problems should be inspected more frequently than areas that demonstrate no Second,if warranted,a maintenance(replacement of the filter problems, particularly after major storms. Ultimately, inspection cartridges and removal of accumulated sediments)should be and maintenance activities should be scheduled based on the performed during periods of dry weather. historic records and characteristics of an individual StormFilter system or site. It is recommended that the site owner develop a database to properly manage StormFilter inspection and maintenance programs.. 'f r Y T 2 Maintenance Decision Tree • The need for maintenance is typically based on results of the inspection. The following Maintenance Decision Tree should be used as a general guide.(Other factors,such as Regulatory Requirements,may need to be considered). tyx''ia. n . 4107 s • .,,v-. ,q' Please note Stormwater Management StormFiter devices installed •Pt � downstream of,or integrated within,a stormwater storage facility me 'x typically have different operational parameters(i.e.draindown time). In these cases,the inspector must understand the relationship between the retention/detention facility and the treatment system by evaluating ., ' f site specific civil engineering plans,or contacting the engineer of record, TTjj and make adjustments to the below guidance as necessary. Sediment deposition depths and patterns within the StormFilter are likely to be quite different compared to systems without upstream storage ' s, and therefore shouldn't be used exclusively to evaluate a need for -r4 :r � .3� :...� • maintenance. Inspection Procedures 1. Sediment loading on the vault floor. a. If>4"of accumulated sediment, maintenance is The primary goal of an inspection is to assess the condition of the required. cartridges relative to the level of visual sediment loading as it relates to decreased treatment capacity. It may be desirable to conduct this 2. Sediment loading on top of the cartridge. inspection during a storm to observe the relative flow through the a. If>1/4"of accumulation, maintenance is required. filter cartridges. if the submerged cartridges are severely plugged, then typically large amounts of sediments will be present and very 3. Submerged cartridges. little flow will be discharged from the drainage pipes. If this is the a. If>4"of static water above cartridge bottom for more case, then maintenance is warranted and the cartridges need to be than 24 hours after end of rain event, maintenance replaced. is required.(Catch basins have standing water in the cartridge bay.) Warning: In the case of a spill,the worker should abort • inspection activities until the proper guidance is obtained 4. Plugged media. Notify the local hazard control agency and Contech Engineered a.While not required in all cases, inspection of the media Solutions immediately ,- " c4y r %, ., _ within the cartridge may provide valuable additional information. To conduct an inspection: 3 b. If pore space between media granules is absent, Important: Inspection should be perform byed a person who rs familiar with the operation and configuration of the StormFilter "'r maintenance is required. treatment unit and the unit's role,relative to detention or 5. Bypass condition. retention fay lines onsite, a, If inspection is conducted during an average rain fall 1. If applicable, set up safety equipment to protect and notify event and StormFilter remains in bypass condition surrounding vehicle and pedestrian traffic. (water over the internal outlet baffle wall or submerged 2. Visually inspect the external condition of the unit and take notes cartridges), maintenance is required. concerning defects/problems. 6. Hazardous material release. 3. Open the access portals to the vault and allow the system vent. a. If hazardous material release(automotive fluids or other) 4. Without entering the vault,visually inspect the inside of the is reported, maintenance is required. unit,and note accumulations of liquids and solids. 7. Pronounced scum line. 5. Be sure to record the level of sediment build-up on the floor of the vault, in the forebay,and on top of the cartridges. If flow 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. all observations. Digital pictures are valuable for historical documentation. 6. Close and fasten the access portals. 7. Remove safety equipment. B. If appropriate, make notes about the local drainage area relative • to ongoing construction, erosion problems, or high loading of other materials to the system. 9. Discuss conditions that suggest maintenance and make decision as to whether or not maintenance is needed. 3 Maintenance Depending on the configuration of the particular system, I"' maintenance personnel will be required to enter the vault to ft ` perform the maintenance. _ .-- Important If vault entry is required,OSHA rules for confined 1rr j w spacear must be followed ;;3' _ ``x f' Pik F - Filter cartridge replacement should occur during dry weather. _ :' It may be necessary to plug the filter inlet pipe if base flows is r occurring. I ii Replacement cartridges can be delivered to the site or customers facility. Information concerning how to obtain the replacement cartridges is available from Contech Engineered Solutions. 'w P. ti, Warning:In the case of a spill,the maintenance personneliiigie # *t ;t ,-_ should abort maintenance activities until the proper guidance „" ,_ Ni.,,,,, is obtained.Notifythe local hazard control agency and ` k t_ 9 Y r '' Contech Engineered Solutions immediately. �. �� ' - I i 4. il - /- To conduct cartridge replacement and sediment removal yw maintenance: izr i , 4, 11`> Ilk' , 1. If applicable,set up safety equipment to protect maintenance :. ' ..... .,� r p.j personnel and pedestrians from site hazards. 2. Visually inspect the external condition of the unit and take notes concerning defects/problems. '; .F 3. Open the doors(access portals)to the vault and allow the system to vent. r, ., : ti ;*% fa 4. Without entering the vault, give the inside of the unit, Important:Care must be used to avoid'damaging f'h % `'- including components,a general condition inspection. cartridges during removal and installation.The cost of7 :. 5. Make notes about the external and internal condition of repairing components damaged during maintenance will be the vault.Give particular attention to recording the level of the responsibility of the owner. sediment build-up on the floor of the vault, in the forebay, C. Set the used cartridge aside or load onto the hauling and on top of the internal components. truck. 6. Using appropriate equipment offload the replacement cartridges(up to 150 lbs.each)and set aside. D. Continue steps a through c until all cartridges have been 7. Remove used cartridges from the vault using one of the removed. following methods: Method 2: Method 1: A. This activity will require that maintenance personnel enter A. This activity will require that maintenance personnel enter the vault to remove the cartridges from the under drain the vault to remove the cartridges from the under drain manifold and place them under the vault opening for manifold and place them under the vault opening for lifting (removal). Disconnect each filter cartridge from the lifting (removal). Disconnect each filter cartridge from the underdrain connector by rotating counterclockwise 1/4 of underdrain connector by rotating counterclockwise 1/4 of a turn. Roll the loose cartridge, on edge,to a convenient a turn. Roll the loose cartridge,on edge,to a convenient spot beneath the vault access. spot beneath the vault access. B. Unscrew the cartridge cap. Using appropriate hoisting equipment, attach a cable C. Remove the cartridge hood and float. from the boom, crane,or tripod to the loose cartridge. Contact Contech Engineered Solutions for suggested D. At location under structure access,tip the cartridge on its attachment devices. side. B. Remove the used cartridges(up to 250 lbs. each)from the E. Empty the cartridge onto the vault floor. Reassemble the • vault, empty cartridge. F. Set the empty, used cartridge aside or load onto the hauling truck. G. Continue steps a through e until all cartridges have been removed. 4 I 8, Remove accumulated sediment from the floor of the Material Disposal vault and from the forebay.This can most effectively be The accumulated sediment found in stormwater treatment accomplished by use of a vacuum truck. and conveyance systems must be handled and disposed of in • 9. Once the sediments are removed,assess the condition of the accordance with regulatory protocols. It is possible for sediments vault and the condition of the connectors. to contain measurable concentrations of heavy metals and 10.Using the vacuum truck boom, crane,or tripod, lower and organic chemicals(such as pesticides and petroleum products). install the new cartridges. Once again,take care not to Areas with the greatest potential for high pollutant loading damage connections. include industrial areas and heavily traveled roads. 11.Close and fasten the door. Sediments and water must be disposed of in accordance with 12.Remove safety equipment. all applicable waste disposal regulations.When scheduling 13.Finally,dispose of the accumulated materials in accordance maintenance,consideration must be made for the disposal of with applicable regulations. Make arrangements to return the solid and liquid wastes.This typically requires coordination with used empty cartridges to Contech Engineered Solutions. a local landfill for solid waste disposal.For liquid waste disposal a number of options are available including a municipal vacuum truck decant facility,local waste water treatment plant or on-site treatment and discharge. Related Maintenance Activities - Performed on an as-needed basis StormFilter units are often just one of many structures in a more u° comprehensive stormwater drainage and treatment system. In order for maintenance of the StormFilter to be successful, it is imperative that all other components be properly maintained. The maintenance/repair of upstream facilities should be carried out prior to StormFilter maintenance activities. t In addition to considering upstream facilities,it is also important to correct any problems identified in the drainage area. Drainage area concerns may include:erosion problems, heavy oil loading, _ and discharges of inappropriate materials. !r:s asri` a h x, fib.r _ , ." tt.:e:' ✓1M. .t'm.a� 5 Inspection Report Date: Personnel: Location: System Size: Months in Service: System Type: Vault ❑ Cast-In-Place P Linear Catch Basin ❑ Manhole ❑ Other: Sediment Thickness in Forebay: Date: Sediment Depth on Vault Floor: Sediment Depth on Cartridge Top(s): Structural Damage: Estimated Flow from Drainage Pipes(if available): Cartridges Submerged: Yes ❑ No ❑ Depth of Standing Water: StormFilter Maintenance Activities(check off if done and give description) ❑ Trash and Debris Removal: ❑ Minor Structural Repairs: ❑ Drainage Area Report Excessive Oil Loading: Yes ❑ No ❑ Source: Sediment Accumulation on Pavement: Yes No ❑ Source: Erosion of Landscaped Areas: Yes ❑ No ❑ Source: • Items Needing Further Work: Owners should contact the local public works department and inquire about how the department disposes of their street waste residuals. Other Comments: Review the condition reports from the previous inspection visits. • StormFilter Maintenance Report Date: Personnel: • Location: System Size: System Type: Vault❑ Cast-In-Place ❑ Linear Catch Basin ❑ Manhole ❑ Other: List Safety Procedures and Equipment Used: System Observations Months in Service: Oil in Forebay(if present): Yes ] No ❑ Sediment Depth in Forebay(if present): Sediment Depth on Vault Floor: Sediment Depth on Cartridge Top(s): Structural Damage: Drainage Area Report Excessive Oil Loading: Yes ❑ No ❑ Source: Sediment Accumulation on Pavement: Yes ❑ No ❑ Source: Erosion of Landscaped Areas: Yes ❑ No ❑ Source: StormFilter Cartridge Replacement Maintenance Activities Remove Trash and Debris: Yes ❑ No ❑ Details: Replace Cartridges: Yes ❑ No ❑ Details: Sediment Removed: Yes ❑ No [ Details: Quantity of Sediment Removed(estimate?): Minor Structural Repairs: Yes E No E Details: Residuals(debris, sediment) Disposal Methods: Notes: • • Cp PAPF KECYRGED C ► NTECH` ENGINEERED SOLUTIONS ®2020 CONTECH ENGINEERED SOLUTIONS LLC,A QUIKRETE COMPANY 800-338-1122 www.ContechES.com All Rights Reserved.Printed in the USA. Contech Engineered Solutions LLC 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 www.ContechES.com or call 800.338.1122. Support • Drawings and specifications are available at www.conteches.com. • Site-specific design support is available from our engineers. NOTHING IN THIS CATALOG SHOULD SE CONSTRUED AS A WARRANTY.APPLICATIONS SUGGESTED HEREIN ARE DESCRIBED ONLY TO HELP READERS MAKE THEIR OWN EVALUATIONS AND DECISIONS,AND ARE NEITHER GUARANTEES NOR 4110 WARRANTIES OF SUITABILITY FORA Y APPLICATION,CONTECH MAKES NO WARRANTY WHATSOEVER,EXPRESS OR IMPUED, RELATED TO THE APPLICATIONS,MATERIALS,COATNGS,OR PRODUCTS DISCUSSED HEREIN ALL RAKED WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE ARE DISCLAIMED BY CONTECH. SEE CONTECH'S CONDITIONS OF SALE(AVAILABLE AT W WW.CONTECHES.COM/COS)FOR MORE INFORMATION. 800.338.1122 www.conteches.com StormFilter Inspection and Maintenance Procedures 4/20