The City of Mequon was experiencing basement backups and bypassing in the southeast portion of the City, with hundreds of homes impacted during wet weather events. Beyond this unsanitary, unpleasant situation for the residents of Mequon, Wisconsin Department of Natural Resources (WDNR) and Milwaukee Metropolitan Sewerage District (MMSD) regulations and restrictions were not being met. In conjunction with additional inflow and infiltration (I&I) studies and reduction projects, raSmith and AECOM teamed to complete the $15 million East Trunk Sewer design project.
This project included upsizing approximately 3,000 feet of existing 24-inch sanitary sewer and adding 8,000 feet of 48-inch sanitary sewer. The sewers will improve the sanitary system performance both with in-line storage and upsized conveyance systems. The final construction traversed alongside waterways and wetlands; beneath railroad and interstate freeways; and through parks, residential areas, city streets and county roads.
The scope of services included: route evaluations for 11,000 feet of new infrastructure; design memo, route recommendation; complete survey; modeling and design of all infrastructure improvements including microtunneling (7,000 feet of 48-inch pipe), open-cut excavation and pilot tube microtunneling (3,000 feet of 24-inch pipe); future planning, sizing and lift station siting for future growth areas within the City; diversion and bypass structure; permitting including DNR, Union Pacific RR, DOT, Ozaukee County, MMSD; utility coordination; easement acquisitions (15 properties); 16-inch force main design; constructability analysis and pipe design; discussing construction logistics with contractors during the design phase; erosion control, traffic control, construction sequencing and phasing over two-year construction period; landscape plans; multi-city jurisdictional coordination with MMSD, City of Bayside, City of Milwaukee and City of Mequon; construction administration, inspection and staking.
The East Trunk Sewer Design project was featured in Tunneling Business Magazine.