S02 Atch D 20220114 TD2 Geotechnical Report - 9 pages.pdf

This document is a Geotechnical Exploration Report prepared by Thompson, Dreessen & Dorner, Inc. for Alesia Architecture, P.C. regarding VA EHRM Upgrades at 2201 North Broadwell Avenue in Grand Island, Nebraska. The report details soil conditions and recommendations for a mechanical room addition, based on a single soil boring (B-1) advanced to a depth of 20 feet.

Key findings include the presence of man-placed fill overlying natural alluvium, consisting of Poorly Graded Sand (SP) with a lean clay (CL) classification. The site surface is landscape grass-covered with approximately 1 foot of relief. Laboratory analysis showed the fill material has a moisture content of 14.2%, a dry unit weight of 111.2 pounds per cubic foot, and a confined compressive strength of 0.93 tons per square foot. The report provides detailed recommendations for foundation construction, including footing design, soil compaction, drainage, and potential challenges with trench construction due to sandy soil conditions.