Geotech_Report.pdf

This document is a geotechnical exploration report prepared by Midland Standard Engineering & Testing, Inc. for Civiltech Engineering, Inc. regarding the 90 North Park Shared Street Improvements project located in Schaumburg, Illinois. The report documents a subsurface exploration and analysis conducted to determine existing soil conditions for a planned alignment and to assess the types of soil encountered at the proposed pavement subgrade elevation. The investigation included seven soil borings drilled to a depth of fifteen feet, with field and laboratory testing performed to analyze soil characteristics, density, strength, and water levels.

The report reveals predominantly clay and sandy clay soil conditions with varying densities and consistencies. Key findings include a minor grade raise planned for the project, with most soil layers being very stiff to hard clay with moisture contents ranging from 16-20% and unconfined compressive strengths between 2.0 and 5.04 tons per square foot. The investigation also identified water-bearing granular layers at several boring locations and recommended specific treatment approaches for subgrade preparation, including potential removal of unsuitable materials, aggregate subgrade improvements, and considerations for utility trench backfilling. Additionally, environmental testing detected arsenic concentrations in some soil samples, which may impact excavation and disposal requirements for certain sections of the project area.