South County Sanitary Relief

Summary

Kaskaskia Engineering Group, LLC (KEG) provided geotechnical and environmental services to the Metropolitan St. Louis Sewer District (MSD), as a sub-consultant to Wood. The South County Sanitary Relief project is for 9,238 feet of proposed sanitary trunk sewer to upgrade and replace an existing trunk sewer located along the banks of Sugar Creek in the City of Oakville in unincorporated St. Louis County, Missouri.

Project

KEG provided field exploration, laboratory testing, analysis, and reporting for the entire trunk alignment and proposed appurtenances, such as manholes and laterals. Thirty-eight borings were completed for the project to depths of as much as 25 feet below existing grades. Rock coring was also performed where impacted. KEG’s coordination with property owners was a critical part of obtaining access to drilling locations and for the successful completion of the exploration within the project schedule.

Reporting consisted of both a Geotechnical Data Report (GDR) and a Geotechnical Interpretive Report (GIR) for inclusion in contractor bidding specifications. Details of these reports included location and general description of existing fill materials, the influence of groundwater and/or rock on design and construction, and further geotechnical construction recommendations.

In addition, the KEG Environmental team completed a Waters of the U.S. Report, wetland survey, and bat habitat survey for the project. KEG completed a site reconnaissance and data collection visit to delineate any potential wetlands and Waters of the U.S. within the project area. Five wetlands (2.1 acres) and 15 streams (1,744.1 linear feet) were present within the survey area. Wetland and stream boundaries were recorded using GPS. Bat habitat was also evaluated based on the 2017 USFWS Bat Summer Survey Guidance. Information was presented in a waters and wetland delineation report and bat habitat report.