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Coca-Cola Enterprises-West <br /> USTEC job No.90054.03 <br /> general accordance with the Tri-Regional Board Staff Recommendations for Preliminary <br /> Evaluation and Investigation of Underground Storage Tank Sites,the Leaking Underground Fuel <br /> i Tank Field (LUFT) Manual, and the California Well Standards Bulletin 74-90. All work was <br /> conducted under the supervision of a USTEC geologist registered in the State of California. The <br /> F procedures used by USTEC personnel during the field investigation are described in the <br /> i <br /> following sections. <br /> 3.1.1 Drillingand Subsurface Soil Sam lin <br /> f <br /> Eleven additional soil borings were drilled at the Coca-Cola site to evaluate the vertical and <br /> t lateral extent of contamination, to provide a stratigraphic description of the subsurface,and to <br /> obtain selected soil samples for chem'. 1 analysis. Boring locations were selected in the field on <br /> visual observations made during the previous <br /> the basis of the soil gas survey results, <br /> investigation,and overall vertical and lateral site coverage. The soil boring locations are shown <br /> r on Figure 3. <br /> i <br /> Soil samples were collected at 5 or 10-foot intervals starting at depths of 5 or 10 feet bgs and <br /> continuing to the full depth of exploration. All soil samples were collected in general accordance <br /> i --- <br /> i with American Society of Testing and Materials(ASTM)method D-1586. Samples were collected <br /> - t <br /> with a 3-inch O.D.modified California split-barrel sampler containing three 21/2-inch diameter <br /> by!-inch long brass sample retainers. The sampler was lowered through the center of the auger <br /> i — <br /> and driven in front of the auger bit into the undisturbed soil with a 140-pound drop hammer. <br /> The sampler was then withdrawn and opened to obtain the samples. The penetration resistance <br /> values (i.e.blow counts)for each sample interval are recorded on the edited stratigraphic logs. <br /> The edited stratigraphic logs are presented in Appendix D. <br /> Upon retrieval,soil from the upper retainer was examined visually for organic contamination <br /> by the USTEC field geologist and then classified in general accordance with the Unified Soil <br /> Classification System(ASTM Standard D-2487). The middle sample retainer was prepared for <br /> submittal to Sequoia_Analytical Laboratory,Redwood City,California,for chemical analysis. The _ _..... <br /> 1 <br /> 9 <br />