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' Bndgestone/Firestone, Inc. 400 N. El Dorado, Stockton, Califorma <br /> February 2, 1994 Site Assessment Report—RMI 207201 Page 4 of 12 <br /> 3.2 Driller Identification <br /> All boring and sampling activity was performed as prescribed in the California Code <br /> of Regulations, Title 23, Chapter 16 The drilling subcontractor, Spectrum <br /> Exploration, Inc of Stockton, California, possesses a current C-57 State of <br /> California Well Contractor's License (512268), and is experienced in environmental <br /> drilling practices and associated industry standards <br /> 3.3 Drilling Equipment/Methods <br /> ' On-site equipment included a <br /> truck-mounted CME-75 drill rig, a moble B-24 skid <br /> mounted drill rig, and one support vehicle furnished with a self-contained, high- <br /> pressure steam decontamination system <br /> Soil borings were drilled using 6 25-, 4 25-, and 2 25-inch inside diameter hollow- <br /> stem augers Soil samples were collected using a 2-inch inside diameter, 18-inch <br /> length, California-modified, split-spoon, drive-tube sampling device lined with clean <br /> 6-inch length brass sleeves The drive tube was employed at 5-foot intervals <br /> ' throughout the soil boring profile with a 140-pound hammer, 30-inch drop, <br /> repetitive impact procedure on all three sal borings completed outside of the <br /> building The sample tube was driven hydraulically in the two borings completed <br /> inside of the budding This approach yielded relatively undisturbed samples for field <br /> vapor screening, visual inspection, and possible laboratory analysis within each <br /> split-spoon sampling event Subsurface drilling equipment (bits, auger flights, split <br /> spoons, drill rod, and pins) was decontaminated prior to arrival at the site with <br /> high-pressure steam spray The split-spoon apparatus was decontaminated with <br /> a phosphate-free soap and detonized water mixture prior to each sample collection <br />' event <br />' 3.4 Soil Classification <br /> The subsurface soil profile was classified in the field by Mr John Axelson, <br />' environmental geologist for Ryan-Murphy The Unified Soil Classification System <br /> (USCS) was utilized to define physical soil matrix characteristics throughout the <br /> vertical profile. <br /> RYAN RMpHY, INCORP'ORA'TED Deaver <br /> FuvirommutaE Conslrnctim Manageovent Las Angebs <br />