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d <br /> 45 East Harding Way, Stockton, California July 22, 1992 <br /> Chevron U S A Products Company Page 4 <br /> i <br /> 3 0 SCOPE OF WORK <br /> 3 1 Site-Specific Health and Safety Pian/Background Review/Permitting <br /> Groundwater Technology prepared a Site-Specific Health and Safety Plan required by the <br /> Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations <br /> and Emergency Response" guidelines (29 CFR 1910 120) The Site-Specific Health and Safety <br /> Plan was prepared by a Groundwater Technology personnel, following a complete review of site <br /> conditions and any existing Site-Specific Health and Safety Plans for the site with the project <br /> manager The document was reviewed and signed by all Groundwater Technology personnel <br /> and subcontractors performing work at the site <br /> Groundwater Technology conducted a technical review of all pertinent information prior to <br /> proceeding with assessment work at the site All applicable permits pertaining to monitoring <br /> well installation were obtained (Appendix A) <br /> 32 Soil Borings <br /> On May 11 and 12, 1992, Groundwater Technology drilled three sod borings utilizing a truck- <br /> mounted drill rig equipped with 8-inch diameter (steam cleaned) hollow-stem augers Two of <br /> the soil borings were drilled to depths of 75-feet below grade to accommodate installation of <br /> monitoring wells MW-10 and MW-11 The boring for the vapor extraction well (V-6) was <br /> drilled to a depth of 29 feet The field geologist maintained a log of the materials encountered <br /> during drilling using the Unified Sod Classification System (Appendix B) The drilling operation <br /> was supervised by a California registered geologist The soil from the borings was placed on <br /> plastic sheeting and covered pending characterization and disposal at a later date <br /> 33 Sod Sampling <br /> During the drilling operations, soil samples were collected at five-foot intervals, and notable <br /> lithologic changes beginning at approximately 5 feet below grade to the bottom of the boring <br /> Samples were collected using a 2 5-inch outside diameter (0 D ) split-spoon sampler, lined with <br /> three 2-inch-diameter by 6-inch-long brass sample tubes The sampler was driven 18 inches <br /> I GROUNDWATER <br /> Y TECHNOLOGY <br />