K. Singh & Associates, Inc. (KSingh) was retained by the Milwaukee Metropolitan Sewerage District to provide on-call engineering services for concrete removal for the Menomonee River Channel between Wisconsin Avenue and IH94 west of the Valley Park subdivision.
KSingh provided Geotechnical Engineering, Phase I & II Environmental Site Assessments (ESA’s), Structural Engineering and Cost Estimating for this project. KSingh also did a feasibility study for the placement of spoils on a parcel of land owned by the MMSD. A Phase II ESA was conducted and showed that the parcel would accept low impact soils. Based on KSingh’s work, the site received WDNR approval as a low hazard spoils site.
After conducting the Phase I ESA, it was recommended that a limited Phase II Sediment Characterization be conducted to develop a soil management plan for the excavated sediments.
KSingh also performed a structural (wall) assessment, as part of the planned work for rehabilitation and naturalization of the Menomonee River channel in the reach between West Wisconsin Avenue and Interstate 94. This work was in conjunction with the USACE.
The Phase II Sediment Characterization program was performed under difficult conditions as the steep side slopes of the channel with low friction from the concrete, limited access, and high water levels of the Menomonee River presented many challenges to mechanical sampling. The challenges were overcome and soil sampling and sediment characterization were completed which allowed the project to move forward on schedule. Issues identified included the presence of metals and PAHs in sediments, which were managed as beneficial reuse material, and chlorinated hydrocarbons, which were managed as special waste under a “contained out” decision.