ATT 10 - GEO Reports B20.pdf

This document is a Geotechnical Engineering Study prepared by Lambert and Associates for a proposed VA Hospital Building #20 Addition in Grand Junction, Colorado. The study, conducted on November 14, 2007, involved two test borings to evaluate subsurface soil conditions and provides detailed recommendations for foundation design, construction considerations, and potential geotechnical challenges.

Key findings include encountering sandy clay fill material and silty clay with gravelly cobbles at various depths, with free subsurface water detected at 6-8 feet below existing site grades. The report recommends several critical considerations for construction, including proper foundation support, potential use of driven piles or drilled piers, compacted structural fill placement, drainage systems, and mitigation of potential soil swell and settlement issues. The engineers suggest careful attention to excavation techniques, foundation embedment, and moisture control during construction to ensure structural integrity and minimize potential foundation performance problems.