Comprehensive Sewer Planning Update Meeting Leeann Butschlick, Director of Public Works Mustafa Emir, Village Engineer June 5, 2017

Tonight’s Agenda Recap of 2011 Comprehensive Facility Plan Summary of Combined Area Studies by Shorewood Summary of MMSD Initiatives in the Combined Area

Facility Plan Goals GOAL 1 - Provide basement back-up protection for 2 inches of rain in 1 hour throughout the Village by 2015 GOAL 2 - Reduce Inflow and Infiltration (I&I) in separated area by 40% by 2035 and 80% long-term, for back-up protection for 4 inches of rain in 1 hour GOAL 3 - Separation of the sanitary and storm sewer in the combined area will be completed by 2035, resulting back-up protection against a minimum of 4 inches per 1 hour in this area GOAL 4 - Reduce street flooding throughout the Village to provide a minimum of 2 feet freeboard during 3 inch per hour rainfall by 2020.

Sewer Planning Recap July ‘10 Nearly1,000 homes damaged from flooding and basement back-ups caused by July 15 and July 22 storms. August ‘10 Four public meetings Village made sewers a “top priority” Performance Goals Established. Village staff began developing “Comprehensive Sanitary Sewer, Stormwater and Drainage Facility Plan” Sept. ‘10 – Feb. ‘11 Village completes a full study of Village’s sewers; problems and solutions identified; initial plan was drafted Six public update meetings Village pre-qualified four firms for plan review and Pre-Design Memoranda

Sewer Planning Recap… March ‘11 – May ‘11 Four firms reviewed the plan and developed Pre-Design Memoranda. The plan was revised to include recommendations from Pre-Design Memoranda. May ’11 Village Board approved the plan Four firms were hired to complete design and engineering for sewer projects June ‘11 Village approves contract modifications to incorporate sewer improvements into 2011 Downer Avenue road project July ’11 Surveys sent out to all Shorewood property owners to gauge support for a proposed funding plan for sewer projects Sept. ’11 Village receives survey results from UW-Milwaukee Center for Urban Initiatives and Research Feb ‘11 – Nov “11 3 Public Meetings and Village Board updates in February, April, and November

Sewer Planning Recap… 2012 Basin 1 and 6 Sewer Improvement Design Basin 1 and 6 Sewer Improvement Construction 2014 Phase II(a) of Basin 6 sewer improvement construction Separation of Basin 6 from Whitefish Bay Continued refinement of Facility Plan recommendations for Combined Sewer Service Area Update provided to Village Board in August MMSD Evaluation of Combined Sewer Alternatives completed in November (consultant: CDM/Smith) 2015 Independent Cost estimates that compare Combined Service Area alternatives (consultant: Concord Group) Update presented to Village Board in March 2015 2016 Study on Environmental Impacts of the new Storm Sewer outlet to Milwaukee River (consultant: Baxter & Woodman) 2017 MMSD finalizes internal study to reconfigure MMSD systems to increase service to Shorewood and Milwaukee

Facility Plan Project Summary Inflow-Infiltration reduction in public and private sewers throughout the Village - ONGOING Basin 1 Sanitary and Storm Sewer Construction - COMPLETE Basin 6 Sanitary and Storm Sewer Construction - COMPLETE Combined Area North Combined Sewer Construction - COMPLETE Combined Area South Combined Sewer and Storm Sewer Construction - PLANNED

Combined Sewer Service Area South Planning Summary Starting in 2011, Shorewood develops a plan to install a new storm sewer outfall to Milwaukee River to collect street runoff instead relying only on combined sewers. The concept is further developed in 2014 by MMSD studies and measures to further reduce runoff in the combined sewers are proposed. This was presented to the Board in 2015. Following that meeting in 2015, Shorewood conducts a study to evaluate the regulatory feasibility of the Milwaukee River Outfall. At the same time MMSD starts planning for combined sewer capacity improvements to better serve Shorewood and Milwaukee.

Summary of the Milwaukee River Outfall Solution The Outfall idea conceived by Ruekert-Mielke in 2011 Refined by CDM/Smith on behalf of MMSD in 2014 – 2015 Regulatory and Phasing considerations by Baxter & Woodman in 2016

Village of Shorewood Existing Combined Sewer System

Village of Shorewood Existing Basement Backup Risk – Computer Modeling Emphasize that this map shows backup “potential” base on these assumptions: gravity sewer (no overhead plumbing), no or inoperable backflow/backwater valve, and elevation of basement floor less than or equal to 6 feet below the elevation of the street; during a 3-inch, 1-hour precipitation event.

Village of Shorewood Existing Surface Ponding – Computer Modeling

Village of Shorewood Alternatives Analysis Full Sewer Separation New Storm Sewer System to Milwaukee River Water Quality Permitting Issues Low Pressure Sewers Overhead / Hung Plumbing in Basements 980 Basement Conversions - Private Improvements Does not Solve Sewage Overflows or Street Flooding Overflow Storm Sewer System aka “Virtual Separation” Recommended Alternative

Village of Shorewood Recommended Improvements Overflow Storm Sewers w/Outfall to Milwaukee River Remove Bottlenecks in Combined Sewer System

Village of Shorewood Regulatory Review – Key Findings Permitting: MMSD; Wisconsin DNR; US Army Corps of Engineers Water Quality Best Management Practices Continued Treatment of the First Flush and Low Flow by MMSD Green Infrastructure Measures Not Needed At This Time To Meet Current Regulations Draft water quality study completed by WDNR / MMSD for Milwaukee River Total Maximum Daily Load (TMDL) for Certain Pollutants

Village of Shorewood Existing Basement Backup Risk

Village of Shorewood Basement Backup Risk – Following Improvements

Intentional, by design, street flow <6” Intentional, by design, street flow <6”. Still a some ponding – mostly south blocks

Village of Shorewood Proposed Overflow Sewer System New Storm sewer to take surcharge of basements (disconnect downspouts and sump pumps) – criteria: during the 3-inch 1-hr storm – HGL below basements (6’ freeboard), 6” max in street, 9” max in sags. 2 hour ponding duration

Village of Shorewood Improvement Summary Provide Basement Backup Protection / Reduce Street Flooding Overhead Sewer / Hung Plumbing in Selected Basements Removing Bottlenecks in Combined Sewer System Overflow Storm Sewers w/Outfall to Milwaukee River Continued Treatment of the First Flush and Low Flow by MMSD

Everything comes together Baxter & Woodman shows us the regulatory framework for the proposed Milwaukee River Storm outfall. Baxter & Woodman also tell us that, without combined sewer capacity increases envisaged by MMSD, the way to address flooding is to provide the Milwaukee River outfall FIRST, so other pipes can connect to it in future years and expand coverage. With Combined sewer capacity increase by MMSD, the sequence of implementation will be different…

When MMSD increases combined sewer capacity: Instead of having to build the Milwaukee River outfall at great initial expense, Shorewood will be able to construct individual segments of combined sewer to provide significant flood protection. Increased flood protection will allow for the optimization of the most expensive segments of the Milwaukee River outfall and reduce the price tag of the overall response With increased flood protection in place, the planning, permitting, and financing the Milwaukee River outfall can proceed without the pressure of time hanging over us. The expansion of the Milwaukee River outfall service area in future years will increase the storm sewer service area and achieve the Goals of the Facility Plan.

In Plain English We thought our strongest option was to build a big and expensive pipe to Milwaukee River and keep building a network of storm sewers to achieve flood protection. BIG Money by Shorewood with no significant immediate relief, but increasing benefits as more pipes are built We now have MMSD building a big and expensive pipe connecting to their Deep Tunnel, and we can build a network of less expensive combined sewers to deal with flooding BIG Money by MMSD with immediate benefits, and increasing benefits as more pipes are built.