GRAEF-USA Inc.

108th Street Sanitary Sewer Relay

The Village of Hales Corners was periodically experiencing sanitary sewer back-ups in the Village’s most developed drainage basin. It was determined that the area served by the interceptor sewer had expanded well beyond the capacity of the sanitary sewer installed in the early 1900’s. During periods of heavy rainfall, the poorly sloped sewer would backup and flood basements and require bypass pumping. The Milwaukee Metropolitan Sewerage District (MMSD) and the Wisconsin Department of Natural Resources (WDNR) required the Village to take measures so that this would no longer occur. The interceptor was located in an extremely busy section of State Trunk Highway 100 and that section was to be repaved later that year.

GRAEF was asked to look at several alternatives for the replacement of the interceptor and develop costs for these alternatives to identify the most cost effective approach. GRAEF evaluated alternatives within and outside of the highway’s right-of-way as well as relaying the sewer on an adjacent local street. The costs estimates indicated the least expensive construction approach would be to relay the sewer within the heavily traveled six lane highway. GRAEF studied several sewer alignments in an attempt to limit the traffic disruption on the heavily traveled highway. With the majority of the existing sewer laterals on the west side of the highway, GRAEF chose the outside lane of the southbound lanes for the sewer relay. This alignment limited traffic disruptions and allowed the contractor to proceed safely while maintaining traffic flow.

The existing 12-inch and 8-inch sanitary sewer was replaced with an enlarged interceptor consisting of a combination of 18-inch, 15- inch, 12-inch and 8-inch sections. The total length of the relay was 3,700 lineal feet, ranging between 12-24 feet of depth, from Janesville Road to two blocks north of Grange Avenue. Since closing the section of street was not an option, extensive traffic control was required to complete the operation. Restoration of the trenches occurred block by block as the sewer relay progressed. Construction began in April and ended in July of 2006. During construction soils that required remediation were encountered from a former gas station site. GRAEF sampled the trench materials to determine which layers of soils required remediation and the contractor removed the minimum amount of soil for treatment and disposal.
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LOCATION Hales Corners, WI

FACTS Services Provided: Sewer Relay Design, Traffic Control, Soil Remediation, Survey, Construction Administration & Inspection, Record Drawing, Basement Back-up Elimination