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1 ' 16 Janu • ary 2001 ' AGE-NC Protect No 98-0505 Page 2 of 9 ' metamorphic and igneous in origin The Great Valley Province is subdivided into two mayor subdivisions designated the Sacramento and San Joaquin Valleys ' 3.0. PROCEDURES ' On 25 and 26 October 2000, AGE directed the advancement of three pilot soil borings and their completion as monitoring wells to investigate the petroleum hydrocarbon impact to soil and ground water Tasks and procedures for the subsurface investigation were completed by AGE personnel, or under ' the direction of AGE personnel, and were conducted in accordance with the Monitoring Well Installation Work Plan dated 24 March 2000, prepared by AGE, as approved by the PHS-EHD ' 3 1 DRILLING AND SAMPLING ' On 25 and 26 October 2000, three soil borings (MW-6, MW-7, and MW-8) were advanced at the site using a Boart Longyear 81 drill ng, equipped with 8 25-inch diameter hollow-stem augers The drill ng and two-man crew were supplied by V &W Drilling Auger returns generated by drilling were stored on-site in properly labeled DOT-approved model 17H 55-gallon drums, pending laboratory analysis Soil samples from MW-7 and MW-8 were collected ahead of the drill bit using a California modified split-spoon sampler loaded with three pre-cleaned 2-inch by 6-inch brass sleeves Samples were collected at five--foot intervals, beginning at 20 feet bsg using a 140-pound hammer to advance the sampler Soil boring MW-6 soil samples were collected using a two-foot continuous core sampler, beginning at 5 feet bsg The number of blows required to advance the split-spoon sampler over each 6-inch increment of the 18-inch sampling interval was recorded on the boring logs Sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to avoid cross-contamination Soil samples collected using the split-spoon sampler were preserved by covering both ends of the leading or other selected sleeve with Teflon sheets, capping with plastic and sealing with tape For ' soil samples collected utilizing the two-foot continuous core sampler, upon removal from the core sampler, soil samples were collected by pushing a '2-inch by 6--inch long brass sleeve into the recovered soil and the exposed ends of the sleeves were covered with Teflon sheets, capped and I seated with tape The samples were labeled, stored on ice and transported under cham-of-custody to Castle Analytical Laboratory (CAL) Samples were subsequently transported by CAL to i McCampbell Analytical, Inc (MAI) for EPA Method 8260 Modified analysis Both CAL and MAI Advanced GeoEnviranmental,Inc