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…

History

Cuyahoga River 1969

Clean Water Act Regulatory Timeline

1970 1980 1990 2000 2010

POTWsIndustry

Construction

Phase I MS4s

Phase II MS4s

Industrial

Point Sources

StormwaterCWA amended (1987)

Define MS4

Municipal Separate Storm Sewer System (MS4)

Gutters/inlets

Outfalls

Pipes

Channels

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)

San Diego County Application

Highly Urbanized Area

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

Watershed Study Area

Sewer Collection System

Sewer Pipe

Legend

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

107 (21%) sewer pipes selected for further study

GIS/data accuracy key

GIS Selection Results

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 24.7

100 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 11.8

102 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?

Bryn Evans, CPSWQDudekbevans@dudek.com760.479.4143

Questions?