Effectiveness of Private Property Infiltration and Inflow Reduction efforts in East Tosa October 14, 2014: Wauwatosa Budget and Finance Committee Meeting

Overview Background Completed Work Reduction Effectiveness Summary 2

Background 3

MMSD notified Wauwatosa that the MS0411 meter basin flows were too high and not compliant with MMSD Chapter 3 Rules (“flow performance standard”) MS0411 Normal dry weather flow 4 Peak flow is 20 times higher than average flow!

Where is Infiltration and Inflow from? Private Property Line Roof Drain Connection (illegal) Connected Foundation Drain Catch Basin to Sanitary (illegal)

Background 2011 Sanitary Sewer System Evaluation Wauwatosa East Tosa Area Sewersheds WA4001, WA4002, WA4035 Alternatives may include: Disconnect Foundation Drains sump pumps Upsize pipes increase capacity Storage Tank for excess flow Rehabilitate Public mains and manholes reduce I/I Rehabilitate Private Laterals reduce I/I 6

MMSD’s PPIIR Program Established in response to July 2010 severe storms Each community has an allocated amount of funds for use on qualifying activities For work on private property 7 $$$$ How to best use the money? basementconnection.mmsd.com

Investigations Yard slope to house Private Property Right-of-way Storm water Sanitary sewer main Foundation drain Downspout to ground Yard slope to street curbStreetsidewalk basement Lateral Sanitary sewer manhole Catch basin

Sources of I/I Private Property Right-of-way Storm water Sanitary sewer main Foundation drain Downspout to ground Yard slope to street Yard slope to house Catch basin curb Street sidewalk basement Lateral Sanitary sewer manhole 2.5 gpm 46% Foundation Drain 1.8 gpm 0.8 gpm 0.3 gpm 34% Private Lateral 5% Public Sanitary Manhole 15% Public Sanitary Main Estimates primarily based on MMSD Private Property Infiltration/Inflow Pilot Project Report (August 1981) and from physical observations in Wauwatosa MS0411 meter basin Average of 5.4 gpm per property (estimated) 9

Completed Work 10

Project Area

Meter Basin Boundaries 12 Center St 60 th St Vliet St North Ave FM6 MS0411 WA4001 WA4002 WA4035 MI4067 MI4075 Metershed MS0411 Wauwatosa 79% of area Milwaukee 21% of area 60 th St

13 Lateral Grouting Grouting device placed into manhole Grout released into lateral

14 Lateral Lining Cleanout installed near house Liner installed in lateral

Flow Meter Basin: FM6 N. 65 th Pilot Area Sanitary Main Relay ($369,000) Lined 77 Laterals ($414,000) Balance of FM6 Area Grouted 388 Laterals for first 5 feet of lateral ($145,000) Total cost of all work: $928, FM6 North Ave. Clarke St Wright St Meinecke Ave 65 th St 61 st St

FM6 Basin: Extent of Sewer Rehab 16 Private Property Right-of-way Storm water Sanitary sewer main Foundation drain Downspout to ground Yard slope to street Yard slope to house Catch basin curb Street sidewalk basement Lateral Sanitary sewer manhole LEGEND Pilot Lateral Lining Grouting 2.5 gpm 46% Foundation Drain 1.8 gpm 0.8 gpm 0.3 gpm 34% Private Lateral 5% Public Sanitary Manhole 15% Public Sanitary Main

17 26% Reduction in 5-year Peak Hour Flow $1/gpd 5-year event I/I removed 5-year FM6: Comparison of Pre- and Post-Rehab Peak Hour Flows

Includes FM6 work Analysis was of work through June 2014 As of June, grouted 1485 laterals for first 5 feet of lateral (1097 if exclude FM6) 50% of total laterals in basin Cost of $632,000 ($486,586 if exclude FM6) Flow Meter Basin: MS0411 Grouting 18 FM6: Completed Completed In progress during evaluation

MS0411 Basin: Extent of Sewer Rehab 19 Private Property Right-of-way Storm water Sanitary sewer main Foundation drain Downspout to ground Yard slope to street Yard slope to house Catch basin curb Streetsidewalk basement Lateral Sanitary sewer manhole LEGEND Extent of Grouting 2.5 gpm 46% Foundation Drain 1.8 gpm 0.8 gpm 0.3 gpm 34% Private Lateral 5% Public Sanitary Manhole 15% Public Sanitary Main

20 17% Reduction in total 5-year Peak Hour Flow (Milwaukee and Wauwatosa) with 50% of laterals grouted in Wauwatosa 5-year MS0411: Comparison of Pre- and Post-Rehab Peak Hour Flows

Wauwatosa Portion of MS0411 Approx. 16% reduction from City’s grouting work Cost ratio of $0.61/gpd to remove flow just with grouting 21

N. 65 th St. Lateral Lining Pilot Project Area 3 blocks 15 acres 82 laterals 94% participation North Ave Clarke St Meinecke Wright St 22

2 blocks 10 acres 44 laterals 98% participation Center St Wauwatosa Ave 23 Eagle St. Lateral Lining Pilot Project Area 80 th St

Dye colored gusher at tee joint Pre-Rehab 40 gpm Dye colored gusher from lateral Post-Rehab 0.25 gpm 24 Flow Reductions were Visually Estimated

Results Summary Pilot areas are leakier than the metershed average flow. Overall reduction may be smaller when applied to less leaky areas. 25

*Not an official MMSD evaluation for Chapter 3 compliance purposes Close to the performance standard with 50% of laterals grouted and additional rehab work to be completed in

Comparison of Rain Events Brown and Caldwell 27

FM6 Depths: July 2010 Brown and Caldwell 28 Top of Pipe (18” diameter) 2-foot surcharge above the top of the pipe

FM6 Depths: June 2014 Brown and Caldwell 29 Top of Pipe (18” diameter) No surcharge

Summary Private property I/I contribution previously identified Flow reduction effectiveness evaluated for meter basins MS0411 and FM6 (a subbasin of MS0411) Lateral grouting was 50% complete at time of evaluation Flows in FM6 basin reduced by 26% Wauwatosa flows in MS0411 basin reduced by 16% Lateral grouting cost ratio: $0.61/gpd Lateral lining cost ratio: $1.66/gpd MMSD will continue to monitor flows at MS0411 and will determine if the flows are in compliance 30