Material Property Investigation for Project Middle Gust, Events 1, 2, and 4: Report 1, Subsurface Exploration and Laboratory Test Results

This report documents the results of a site investigation conducted to support free-field ground shock calculations and field operations for Project MIDDLE GUST, Events I, II, and III. The site is characterized by a 6- to 9-ft-thick section of sandy clay (CL) and clayey sand (SC) overburden overlying almost 500 ft of clay shale of the Pierre Formation which overlies older sedimentary rocks. A perched groundwater table in the overburden, approximately 4 ft below the ground surface, is fed by water from the Colorado Canal, which borders the site on three sides.