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What Does MS4 Mean to You?A study of sewer and storm drain cross contamination Presented by Bryn Evans
What will we talk about?
A little about surface water quality regulations
What a sewer agency is doing about them
MS4 and Sanitary Sewer
The goal:
A look at future regulations
Start thinking of how MS4 might affect sewer agencies…
Clean Water Act Regulatory Timeline
1970 1980 1990 2000 2010
POTWsIndustry
Construction
Phase I MS4s
Phase II MS4s
Industrial
Point Sources
StormwaterCWA amended (1987)
Municipal Stormwater Timeline
Monitoring,Program
Development
Monitoring, Pilots,
Program Enhancement
Monitoring, Pilots,
Enhancement, Implementation
1990 2000 2010 2020
‘New’ Stormwater (MS4) Permit
Watershed-based
Numerical goal compliance point
Bacteria is a priority pollutant
Priority Water Quality
ConditionsSources
Goals, Strategies, Schedules
Monitoring and
Assessment
Adaptive Management
Process
MS4 Water Quality Improvement Plan(s)
Source assessment
MS4 discharge-focused
Implementation strategies
City of Santa Barbara Studies
• Bacteria in storm drain
• Human-specific
• Sewer exfiltration shown to be source
Are Sewers an MS4 Bacteria Source?
(Sercu et al. 2011, ES&T)
Evaluate small sub-watershed area
Identify potential areas of: • Exfiltration
– and – • Infiltration
Determine frequency Prioritize potential next step
implementation
Sewer Exfiltration/MS4 Infiltration Pilot Study
Each phase narrows search• Ph I – “Desktop” Portion (GIS, rec dwgs, CCTV)• Ph II – Field Investigation (CCTV Storm Drains)• Ph III – Field Testing (dye, soil, sampling)• Ph IV – Pipe Repair/replacement
Pilot Study Phased Approach
Contributing Factors• Pipe crossings• Vertical separation• Sewer pipe condition• Storm drain Material/Size• Soil type
“Desktop” Investigation
Investigate:• Closed Pipe
– And – • Open Channels
Open Channel Storm Drain
Closed Channel Storm Drain
Sewer Pipe
Sewer and Storm Drain System
Legend
Sewer Crossing Storm Drain
GIS functions Combine sewer
data to storm drain and soil data
Sewer/Storm Drain Crossings
Compiled GIS data into categories Missing Data Use record drawings
Vert. Dist. SCORE Horz. Dist SCORE AVERAGE TOTAL SCORE In Valley? SCORE Swr Depth SCORE Vert. Dist. SCORE AVERAGE TOTAL SCORE Length Dia. Installed Flow Depth SCORE Rec. Dwg. Material Defect Severity SCORE EMA SCORE AVERAGE TOTAL SCORE Storm Drain ID SD Type SD Shape SD Material SCORE Size SCORE Age SCORE AVERAGE TOTAL SCORE Soil Type Perm. (in/hr) SCORE AVERAGE TOTAL SCORE93 SL 0 5 9 1 3.0 9.0 y 3 12 3 0 5 3.7 7.3 82 8 1986 0.5 0 D1818 PVC none 0 No 0 0.0 0.0 CC-02416 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 27 2 2.3 2.3 BlC2 3.18 3 3.0 6.0 24.7100 SL 0 5 9 1 3.0 9.0 n 1 11 3 0 5 3.0 6.0 261.55 8 1988 2.7 1 D3114 PVC none No 0 0.5 2.5 CC-02361 Pipe Culvert Circular Reinforced concrete pipe 2 42 3 30 2 2.3 2.3 DaC 0.13 1 1.0 2.0 21.8103 LA 4 3 0 3 3.0 9.0 n 1 5 1 4 5 2.3 4.7 257.5 8 1987 0.3 0 D3066 PVC none No 0 0.0 0.0 CC-00314 Pipe Culvert Circular Reinforced concrete pipe 2 18 2 26 2 2.0 2.0 LeD2 3.25 3 3.0 6.0 21.7116 SL 0 5 8 1 3.0 9.0 y 3 12 3 0 5 3.7 7.3 146 8 1986 0.5 1 D1818 PVC none No 0 0.5 2.5 CC-02416 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 27 2 2.3 2.3 BlC2 3.18 3 3.0 6.0 27.2169 SL 0.5 5 0 3 4.0 12.0 n 1 8 2 1 5 2.7 5.3 170 8 1997 1.7 1 D3509 PVC none No 0 0.5 2.5 CC-02350 Pipe Culvert Circular Reinforced concrete pipe 2 48 4 16 2 2.7 2.7 DaC 0.13 1 1.0 2.0 24.5176 SL 1 5 0 3 4.0 12.0 y 3 7 2 1 5 3.3 6.7 300 12 1983 3.9 2 D1875 PVC/DIP small No 0 1.0 5.0 CC-02087 Unknown Pipe Arch Structural Plate 2 96x72 5 30 2 3.0 3.0 SbC 0.415 1 1.0 2.0 28.7223 SL 0.5 5 0 3 4.0 12.0 y 3 2 1 1 5 3.0 6.0 278 8 1988 1.8 1 D3114 PVC/DIP none No 0 0.5 2.5 CC-02418 Trapezoidal Rectangular Reinforced concrete pipe 2 120x96 5 25 2 3.0 3.0 SbC, LpD2 0.415 1 1.0 2.0 25.5225 SL 0 5 4 2 3.5 10.5 y 3 6 2 0 5 3.3 6.7 118 8 1988 3.3 2 D3114 PVC none No 0 1.0 5.0 CC-02418 Trapezoidal Rectangular Reinforced concrete pipe 2 120x96 5 25 2 3.0 3.0 SbC, LpD2 0.415 1 1.0 2.0 27.2257 SL 2 4 0 3 3.5 10.5 y 3 3 1 2 5 3.0 6.0 261 12 1986 2.5 1 D1934 VCP small No 0 0.5 2.5 OC-00576 Trapezoidal Circular Corrugated metal pipe 3 24 3 27 2 2.7 2.7 SbC, DaD, LpD2 0.32 1 1.0 2.0 23.7276 SL 2 4 0 3 3.5 10.5 y 3 4 1 2 5 3.0 6.0 110 8 1987 1.6 1 D1973 PVC none No 0 0.5 2.5 CC-02377 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 23 2 2.3 2.3 DaC 0.13 1 1.0 2.0 23.3277 SL 0.5 5 0 3 4.0 12.0 y 3 4 1 1 5 3.0 6.0 203 8 1987 1.5 1 D1973 VCP/PVC small No 0 0.5 2.5 CC-02377 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 23 2 2.3 2.3 DaC 0.13 1 1.0 2.0 24.8278 SL 2 4 12 1 2.5 7.5 y 3 4 1 2 5 3.0 6.0 82.01 8 1979 1.9 1 D1545 VCP none Yes 1 1.0 5.0 CC-02377 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 23 2 2.3 2.3 DaC 0.13 1 1.0 2.0 22.8302 LA 0 5 0 3 4.0 12.0 n 1 4 1 0 5 2.3 4.7 243 8 1987 0.5 0 D1698 PVC medium No 0 0.0 0.0 CC-00319 Pipe Culvert Circular Reinforced concrete pipe 2 21 2 26 2 2.0 2.0 DaE2 0.13 1 1.0 2.0 20.7333 SL 0.5 5 0 3 4.0 12.0 y 3 10 2 1 5 3.3 6.7 267 10 1965 5.1 2 VSD001 VCP high No 0 1.0 5.0 CC-02381 Pipe Culvert Circular Corrugated metal pipe 3 54 4 48 3 3.3 3.3 WmC, LpD2 2.2825 3 3.0 6.0 33.0
361 SL 1 5 0 3 4.0 12.0 y 3 6 2 1 5 3.3 6.7 80 8 1987 0.6 1 D1973 PVC none No 0 0.5 2.5 CC-02374 Pipe Culvert Circular Reinforced concrete pipe 2 18 2 23 2 2.0 2.0 DaC 0.13 1 1.0 2.0 25.2362 SL 1 5 0 3 4.0 12.0 y 3 5 1 1 5 3.0 6.0 141 8 1987 1.1 1 D1973 PVC none No 0 0.5 2.5 CC-02367 Pipe Culvert Circular Reinforced concrete pipe 2 30 3 23 2 2.3 2.3 DaC 0.13 1 1.0 2.0 24.8368 SL 0 5 15 1 3.0 9.0 y 3 10 2 0 5 3.3 6.7 225 8 1967 0.7 1 D1046 VCP high No 0 0.5 2.5 CC-02306 Pipe Culvert Circular Orangeber Perforated 4 6 1 46 3 2.7 2.7 DaC, AwC 0.13 1 1.0 2.0 22.8382 SL 2 4 1 3 3.5 10.5 y 3 6 2 2 5 3.3 6.7 177 8 1987 0.8 1 D1973 PVC none No 0 0.5 2.5 CC-02374 Pipe Culvert Circular Reinforced concrete pipe 2 18 2 23 2 2.0 2.0 DaC 0.13 1 1.0 2.0 23.7590 LA 3 4 0 3 3.5 10.5 n 1 3 1 3 5 2.3 4.7 134 8 1982 0.6 1 D1487-S VCP medium Yes 1 1.0 5.0 CC-00368 Pipe Culvert Circular Corrugated metal pipe 3 18 2 35 2 2.3 2.3 LeC2, LeE3 3.25 3 3.0 6.0 28.5
6 SL -12 0 0 3 1.5 4.5 y 3 12 3 -12 1 2.3 4.7 300 8 1991 4.1 2 D3122 VCP No 0 1.0 5.0 CC-02593 Pipe Culvert Horizontal Elipse Reinforced concrete pipe 2 0 1 22 2 1.7 1.7 LpC2 0.415 1 1.0 2.0 17.810 SL -4 0 9 1 0.5 1.5 y 3 8 2 -4 3 2.7 5.3 319 8 1978 0.8 1 D1452-S VCP No 0 0.5 2.5 CC-02366 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 35 2 2.3 2.3 DaC 0.13 1 1.0 2.0 13.725 SL -14 0 10 1 0.5 1.5 y 3 14 3 -14 1 2.3 4.7 288 8 1989 4.1 2 D3210 PVC No 0 1.0 5.0 OC-00859 Trapezoidal Trapezoidal Natural Watercourse 4 24 3 100 3 3.3 3.3 WmC, LpD2 2.2825 3 3.0 6.0 20.539 SL -7 0 0 3 1.5 4.5 y 3 18 4 -7 1 2.7 5.3 350 12 1983 4.2 2 D1875 PVC No 0 1.0 5.0 CC-02086 Pipe Culvert Circular Reinforced concrete pipe 2 48 4 40 2 2.7 2.7 SbC, BlC2 1.7975 2 2.0 4.0 21.552 SL -10 0 15 1 0.5 1.5 y 3 10 2 -10 1 2.0 4.0 325.64 12 1983 5.3 2 D1875-S PVC No 0 1.0 5.0 OC-00515 Trapezoidal Trapezoidal Natural Watercourse 4 24 3 100 3 3.3 3.3 SbC 0.415 1 1.0 2.0 15.853 SL -10 0 15 1 0.5 1.5 y 3 10 2 -10 1 2.0 4.0 243.15 12 1983 5.8 2 D1875-S PVC No 0 1.0 5.0 OC-00515 Trapezoidal Trapezoidal Natural Watercourse 4 24 3 100 3 3.3 3.3 SbC, DaE2 0.2725 1 1.0 2.0 15.859 SL -16 0 0 3 1.5 4.5 y 3 16 4 -16 1 2.7 5.3 350 8 1983 4.2 2 D1875-S PVC No 0 1.0 5.0 OC-00515 Trapezoidal Trapezoidal Natural Watercourse 4 24 3 100 3 3.3 3.3 SbC 0.415 1 1.0 2.0 20.273 LA -1 0 0 3 1.5 4.5 n 1 6 2 -1 5 2.7 5.3 135 8 1985 0.8 1 D1777 PVC No 0 0.5 2.5 CC-00375 Pipe Culvert Circular Asbestos cement pipe 2 18 2 28 2 2.0 2.0 LeC2, LeE3 3.25 3 3.0 6.0 20.375 LA -3 0 12 1 0.5 1.5 n 1 3 1 -3 3 1.7 3.3 94.86 8 1982 0.5 0 D1487 VCP No 0 0.0 0.0 OC-00077 Trapezoidal Trapezoidal Portland Cement Concrete 2 12 2 35 2 2.0 2.0 LeE3 3.25 3 3.0 6.0 12.876 SL -4 0 11 1 0.5 1.5 n 1 4 1 -4 3 1.7 3.3 67 8 1990 0.6 1 D3299-S PVC No 0 0.5 2.5 OC-00577 Trapezoidal Trapezoidal Portland Cement Concrete 2 36 3 35 2 2.3 2.3 DaD 0.13 1 1.0 2.0 11.794 SL -4 0 0 3 1.5 4.5 y 3 11 3 -4 3 3.0 6.0 147 8 1986 0.9 1 D1818 VCP No 0 0.5 2.5 CC-02173 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 27 2 2.3 2.3 SbC 0.415 1 1.0 2.0 17.397 SL -6 0 0 3 1.5 4.5 n 1 6 2 -6 2 1.7 3.3 214 8 1988 0.4 0 D3114 PVC No 0 0.0 0.0 OC-00575 Triangular Triangular Portland Cement Concrete 2 12 2 30 2 2.0 2.0 LpD2 0.415 1 1.0 2.0 11.8102 SL -9 0 5 2 1.0 3.0 n 1 9 2 -9 1 1.3 2.7 10.16 8 2006 4.1 2 D3761 PVC No 0 1.0 5.0 OC-00883 Unknown Unknown Asphalt Cement 3 8 1 7 1 1.7 1.7 LpD2 0.415 1 1.0 2.0 14.3105 SL -10 0 11 1 0.5 1.5 n 1 10 2 -10 1 1.3 2.7 115 8 1985 0.4 0 D1818-S VCP No 0 0.0 0.0 OC-00514 Trapezoidal Trapezoidal Natural Watercourse 4 24 3 100 3 3.3 3.3 FeE2 3.465 3 3.0 6.0 13.5109 LA -3 0 12 1 0.5 1.5 n 1 3 1 -3 3 1.7 3.3 126.5 8 1982 0.9 1 D1487-S VCP No 0 0.5 2.5 OC-00077 Trapezoidal Trapezoidal Portland Cement Concrete 2 12 2 35 2 2.0 2.0 LeC2, LeE3 3.25 3 3.0 6.0 15.3113 SL -2 0 0 3 1.5 4.5 y 3 8 2 -2 4 3.0 6.0 295 8 1986 0.6 1 D1818 PVC none No 0 0.5 2.5 CC-02340 Pipe Culvert Circular Reinforced concrete pipe 2 18 2 27 2 2.0 2.0 BlC2, DaC 1.655 2 2.0 4.0 19.0115 SL -1 0 8 1 0.5 1.5 y 3 14 3 -1 5 3.7 7.3 172 8 1986 0.6 1 D1818 PVC none No 0 0.5 2.5 CC-02416 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 27 2 2.3 2.3 BlC2 3.18 3 3.0 6.0 19.7122 SL -3 0 0 3 1.5 4.5 n 1 9 2 -3 3 2.0 4.0 206 8 1986 0.9 1 D1818 PVC none No 0 0.5 2.5 CC-02419 Pipe Culvert Circular Reinforced concrete pipe 2 18 2 27 2 2.0 2.0 BlC2, DaC 1.655 2 2.0 4.0 17.0130 SL -9 0 17 1 0.5 1.5 n 1 9 2 -9 1 1.3 2.7 204 8 1985 0.4 0 D1818-S VCP No 0 0.0 0.0 OC-00514 Trapezoidal Trapezoidal Natural Watercourse 4 24 3 100 3 3.3 3.3 FeE2 3.465 3 3.0 6.0 13.5133 SL -1 0 17 1 0.5 1.5 n 1 11 3 -1 5 3.0 6.0 101 8 1988 1.7 1 D3114 PVC No 0 0.5 2.5 CC-02361 Pipe Culvert Circular Reinforced concrete pipe 2 42 3 30 2 2.3 2.3 DaC 0.13 1 1.0 2.0 14.3134 SL -2 0 17 1 0.5 1.5 n 1 10 2 -2 4 2.3 4.7 283 8 1988 1.0 1 D3114 PVC high No 0 0.5 2.5 CC-02361 Pipe Culvert Circular Reinforced concrete pipe 2 42 3 30 2 2.3 2.3 DaC, LpD2 0.2725 1 1.0 2.0 13.0
136 SL -1 0 0 3 1.5 4.5 n 1 9 2 -1 5 2.7 5.3 172 8 1989 1.4 1 D3214 PVC none No 0 0.5 2.5 CC-02348 Pipe Culvert Circular Reinforced concrete pipe 2 18 2 24 2 2.0 2.0 DaC, LpD2 0.2725 1 1.0 2.0 16.3147 SL -2 0 0 3 1.5 4.5 n 1 10 3 -2 4 2.7 5.3 25.75 8 1988 1.9 1 D3114 PVC No 0 0.5 2.5 CC-02361 Pipe Culvert Circular Reinforced concrete pipe 2 42 3 30 2 2.3 2.3 DaC 0.13 1 1.0 2.0 16.7153 SL -2 0 14 1 0.5 1.5 y 3 8 2 -2 4 3.0 6.0 94.02 8 1978 0.4 0 D1428-S VCP No 0 0.0 0.0 CC-02303 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 35 2 2.3 2.3 DaC 0.13 1 1.0 2.0 11.8154 SL -2 0 9 1 0.5 1.5 y 3 8 2 -2 4 3.0 6.0 312 8 1978 0.7 1 D1428-S VCP No 0 0.5 2.5 CC-02366 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 35 2 2.3 2.3 DaC 0.13 1 1.0 2.0 14.3166 SL -4 0 11 1 0.5 1.5 n 1 4 1 -4 3 1.7 3.3 135.2 8 1976 1.2 1 D1504-S VCP No 0 0.5 2.5 OC-00577 Trapezoidal Trapezoidal Portland Cement Concrete 2 36 3 35 2 2.3 2.3 DaD, AwC 0.13 1 1.0 2.0 11.7177 SL -2 0 0 3 1.5 4.5 y 3 8 2 -2 4 3.0 6.0 140 8 1986 1.4 1 D1818 PVC none No 0 0.5 2.5 CC-02411 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 27 2 2.3 2.3 BlC2 3.18 3 3.0 6.0 21.3178 SL -2 0 7 1 0.5 1.5 y 3 8 2 -2 4 3.0 6.0 64.33 8 1986 1.5 1 D1818 PVC none No 0 0.5 2.5 CC-02413 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 27 2 2.3 2.3 BlC2 3.18 3 3.0 6.0 18.3180 SL -2 0 7 1 0.5 1.5 y 3 8 2 -2 4 3.0 6.0 215 8 1986 1.0 1 D1818 PVC none No 0 0.5 2.5 CC-02413 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 27 2 2.3 2.3 BlC2 3.18 3 3.0 6.0 18.3188 SL -2 0 0 3 1.5 4.5 y 3 11 3 -2 4 3.3 6.7 173 8 1986 1.2 1 D1818 PVC none No 0 0.5 2.5 CC-02409 Pipe Culvert Circular Reinforced concrete pipe 2 18 2 27 2 2.0 2.0 SbC 0.415 1 1.0 2.0 17.7191 SL -1 0 0 3 1.5 4.5 y 3 13 3 -1 5 3.7 7.3 72 8 1986 1.8 1 D1818 PVC none No 0 0.5 2.5 CC-02414 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 27 2 2.3 2.3 BlC2 3.18 3 3.0 6.0 22.7192 SL -1 0 0 3 1.5 4.5 y 3 13 3 -1 5 3.7 7.3 125 8 1986 1.4 1 D1818 PVC none No 0 0.5 2.5 CC-02415 Pipe Culvert Circular Reinforced concrete pipe 2 24 3 27 2 2.3 2.3 BlC2 3.18 3 3.0 6.0 22.7196 SL -7 0 14 1 0.5 1.5 y 3 7 2 -7 1 2.0 4.0 263 8 1988 0.8 1 D3114 PVC No 0 0.5 2.5 OC-00575 Triangular Triangular Portland Cement Concrete 2 12 2 30 2 2.0 2.0 SbC, LpD2 0.415 1 1.0 2.0 12.0198 SL -14 0 18 1 0.5 1.5 n 1 16 4 -14 1 2.0 4.0 188 8 1967 1.8 1 NS793 VCP Yes 1 1.0 5.0 CC-02330 Pipe Culvert Circular Orangeber Perforated 4 6 1 39 2 2.3 2.3 DaC 0.13 1 1.0 2.0 14.8199 LA -2 0 1 3 1.5 4.5 n 1 4 1 -2 4 2.0 4.0 48.01 8 <Null> 0.9 1 <Null> <Null> No 0 0.5 2.5 CC-03735 Pipe Culvert Circular Reinforced concrete pipe 2 18 2 30 2 2.0 2.0 LeD2 3.25 3 3.0 6.0 19.0213 SL -2.0 0 19 1 0.5 1.5 n 1 9 2 -2 4 2.3 4.7 240 8 1985 0.4 0 D1818-S VCP No 0 0.0 0.0 CC-02081 Trapezoidal Circular Corrugated metal pipe 3 30 3 20 2 2.7 2.7 FeE2 3.465 3 3.0 6.0 14.8238 SL -2 0 14 1 0.5 1.5 y 3 9 2 -2 4 3.0 6.0 123 8 1986 1.2 1 D1818 PVC none No 0 0.5 2.5 CC-02410 Pipe Culvert Circular Reinforced concrete pipe 2 18 2 27 2 2.0 2.0 BlC2 3.18 3 3.0 6.0 18.0241 SL -2 0 0 3 1.5 4.5 y 3 9 2 -2 4 3.0 6.0 137 8 1986 1.2 1 D1818 PVC none No 0 0.5 2.5 CC-02410 Pipe Culvert Circular Reinforced concrete pipe 2 18 2 27 2 2.0 2.0 BlC2 3.18 3 3.0 6.0 21.0242 SL -2 0 0 3 1.5 4.5 y 3 7 2 -2 4 3.0 6.0 248 8 1988 1.1 1 D3114 PVC No 0 0.5 2.5 CC-02360 Triangular Circular Reinforced concrete pipe 2 18 2 30 2 2.0 2.0 SbC 0.415 1 1.0 2.0 17.0250 SL -6 0 11 1 0.5 1.5 n 1 6 2 -6 2 1.7 3.3 300 8 1988 0.5 0 D3114 PVC No 0 0.0 0.0 OC-00575 Triangular Triangular Portland Cement Concrete 2 12 2 30 2 2.0 2.0 LpD2 0.415 1 1.0 2.0 8.8269 SL -2 0 0 3 1.5 4.5 y 3 10 3 -2 4 3.3 6.7 320.08 12 1986 1.8 1 D1934 PVC No 0 0.5 2.5 OC-00576 Trapezoidal Trapezoidal Natural Watercourse 4 24 3 100 3 3.3 3.3 DaD 0.13 1 1.0 2.0 19.0273 SL -6 0 17 1 0.5 1.5 n 1 16 4 -6 2 2.3 4.7 156.62 8 1978 1.2 1 D1502 VCP No 0 0.5 2.5 CC-02330 Pipe Culvert Circular Orangeber Perforated 4 6 1 39 2 2.3 2.3 DaC 0.13 1 1.0 2.0 13.0297 LA -6 0 0 3 1.5 4.5 n 1 14 3 -6 2 2.0 4.0 188 8 1987 1.1 1 D1698 VCP No 0 0.5 2.5 CC-00318 Pipe Culvert Circular Reinforced concrete pipe 2 21 2 26 2 2.0 2.0 DaE2 0.13 1 1.0 2.0 15.0303 LA -2 0 8 1 0.5 1.5 n 1 7 2 -2 4 2.3 4.7 126 8 1987 0.7 1 D1698 VCP small No 0 0.5 2.5 CC-00319 Pipe Culvert Circular Reinforced concrete pipe 2 21 2 26 2 2.0 2.0 DaE2 0.13 1 1.0 2.0 12.7314 SL -9 0 5 2 1.0 3.0 n 1 14 3 -9 1 1.7 3.3 90 8 1979 2.4 1 D1545 VCP Yes 1 1.0 5.0 CC-02329 Pipe Culvert Circular Orangeber Perforated 4 6 1 39 2 2.3 2.3 DaC 0.13 1 1.0 2.0 15.7315 SL -9 0 0 3 1.5 4.5 n 1 18 4 -9 1 2.0 4.0 26.88 8 1979 2.2 1 D1545 VCP No 0 0.5 2.5 CC-02329 Pipe Culvert Circular Orangeber Perforated 4 6 1 39 2 2.3 2.3 DaC 0.13 1 1.0 2.0 15.3
Soil Priority FINAL SCORE
Site ID
HA Spatial Relationship Sewer Pipe Storm Drain PipeGround Water
Data Analysis
5 Categories, 12 sub categories Weighted scoring
Value Horz dist0 -1 5 to 20 ft2 2 to 5 ft3 0 to 2 ft45Score 1 3.0 3.0 9.0
Value Pipe in Valley? Sewer Depth Swr above SD1 no < 5 ft < -6 ft2 - 5 to 10 ft -4 to -6 ft3 yes 10 to 15 ft -2 to -4 ft4 15 ro 20 ft -1 to -2 ft5 > 20 ft > -1 ftScore 3 3 2 2.7 2.0 5.3
Value Defect Severity Flow Depth EMA listed0 none < 1/2" no1 minor defect 1/2" to 3" yes2 small 3" to 12"3 medium > 12"4 high5 seriousScore 2 0 1 1.0 5.0 5.0
Weight
Spatial Relationship Priority RatingSewer vert dist above SD Average Weight Score< 0 ft> 15 ft6 to 15 ft4 to 6 ft2 to 4 ft
Score
Weight Score
0 to 2 ft5
Sewer Pipe Priority RatingAverage
Ground Water RatingAverage
Value SD size Mat'l Age1 <12" HDPE < 15 yrs2 15" to 24" PVC, RCP, etc 15 to 40 yrs3 30" to 48" CMP > 40 yrs4 54" to 96" Perf, Natr'l5 > 96"Score 2 5 2 3.0 1.0 3.0
Value12345Score 1.0 2.0 2.0
Total 19.0
Average Weight Score
2 to 6.36.3 to 20> 20
1
Soil Priority RatingSoil Permeability (in/hr) Average Weight Score<.63.63 to 2
Storm Drain Pipe Priority Rating
Scoring Matrix
Recent CCTV available for all mains Identify defects relative to exfiltration
Sewer Pipe Deficiency Assessment
Based on scoring matrix Narrow search down
• 19 of 507 (4%) sewer pipes above storm drain• 12 of 19 (2%) also cross storm drain• 6 of 12 (1%) also have defect• 2 of 6 (0.3%) also in sandy soil highest rating
Vert. Dist. Horz. Dist Avg Total In Valley? Swr Depth Vert. Dist. Avg Total Flow Depth Defect SeverityEMA Avg Total SD Mat'l Size Age Avg Total Perm. (in/hr) Avg Total116 5 1 3.0 9.0 3 3 5 3.7 3.7 1 0 0 0.3 1.7 2 3 2 2.3 2.3 3 3.0 6.0 22.7 8176 5 3 4.0 12.0 3 2 5 3.3 3.3 2 2 0 1.3 6.7 2 5 2 3.0 3.0 1 1.0 2.0 27.0 3223 5 3 4.0 12.0 3 1 5 3.0 3.0 1 0 0 0.3 1.7 2 5 2 3.0 3.0 1 1.0 2.0 21.7 10225 5 2 3.5 10.5 3 2 5 3.3 3.3 2 0 0 0.7 3.3 2 5 2 3.0 3.0 1 1.0 2.0 22.2 9257 4 3 3.5 10.5 3 1 5 3.0 3.0 1 2 0 1.0 5.0 3 3 2 2.7 2.7 1 1.0 2.0 23.2 7277 5 3 4.0 12.0 3 1 5 3.0 3.0 1 2 0 1.0 5.0 2 3 2 2.3 2.3 1 1.0 2.0 24.3 5302 5 3 4.0 12.0 1 1 5 2.3 2.3 0 3 0 1.0 5.0 2 2 2 2.0 2.0 1 1.0 2.0 23.3 6333 5 3 4.0 12.0 3 2 5 3.3 3.3 2 4 0 2.0 10.0 3 4 3 3.3 3.3 3 3.0 6.0 34.7 1
368 5 1 3.0 9.0 3 2 5 3.3 3.3 1 4 0 1.7 8.3 4 1 3 2.7 2.7 1 1.0 2.0 25.3 4590 4 3 3.5 10.5 1 1 5 2.3 2.3 1 3 1 1.7 8.3 3 2 2 2.3 2.3 3 3.0 6.0 29.5 2
RankSoil Priority Rating FINAL
SCORESite ID
Spatial Relationship Sewer Pipe Priority Rating Storm Drain Pipe Priority RatingGround Water
Desktop Results
CCTV inspection of Storm Drain
Storm drain in poor condition orsigns of infiltration
Storm drain in good condition andno signs of infiltration
Water Sampling
Soil Samples
No Further Action
Dye Testing
Bacteroides detected at
both US and DS sampling
points
Bacteroidesdetected at
only DS sampling
point
Dye detectedin storm
drain
Dye not detectedin storm
drain
Bacteroides not detected
No Further Action
Bacteroidesdetected
Bacteroides notdetected
Repair/RehabSewer Pipe
No Flow or poor
conditions for accurate
sample
Future Phases: Field Investigations
Water Quality Improvement Plans required for municipalities
Bacteria is an MS4 issue• Sewer exfiltration may be a source
Process available to implement cost-effective pilot study
Allows prioritization of potential sites for next step implementation
Conclusions
Understand applicable MS4 water quality issues
Communicate with stormwater department/ municipal agencies
Evaluate “potential sites” for exfiltration issues
Leverage resources within/outside agency
What Can You Do?
Recommended