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U 13 December 2002 AGE-NC Project No. 02-0926 Page 2 of 4 DRILLING AND SAMPLE COLLECTION On 17 October 2002, three soil probe borings (B-1 through B-3) were advanced at the site as part of the assessment activities.The field work was conducted as outlined in the AGE-prepared Revised Work Plan Addendum -July 2002, dated 18 July 2002. The soil probe borings were advanced utilizing a van-mounted Geoprobe 5400, equipped with 1.25-inch diameter probe rods with an attached 1.50-inch diameter soil sampler, using a hydraulic hammer to drive the soil sampler to the specified depths.The three borings were advanced vertically to depths of 15 feet below surface grade(bsg). During the boring operation,soil samples were collected at 5-foot intervals,beginning at 5 feet bsg, to the total depth of each boring. Each sample was collected utilizing a 1.50-inch Geoprobe soil sampling assembly loaded with four six-inch brass sleeves.After collection,the ends of the second brass sleeve were covered with Teflon sheets,capped and sealed with tape. The sleeve was labeled with soil probe boring location,depth,time,date and sampler's initials and then placed in a chilled container.Then the soil from one of the three remaining sleeves was field-screened for the presence ofvolatile organic compounds,using an organic vapor meter(OVM)equipped with photo-ionization detector(PID). Soils encountered in the borings were also visually classified by an AGE geologist in accordance with the Unified Soil Classification System(USCS).Following soil sample collection, all probe-boring locations were abandoned by backfilling with portland cement from the total depth to surface grade. EQUIPMENT DECONTAMINATION Prior to sample collection,the Geoprobe soil sampling equipment was thoroughly rinsed twice with clean water after being washed with a solution of Alconox. In addition, the Geoprobe rods were thoroughly cleaned prior to soil probe boring advancement. ANALYTICAL METHODS Three selected soil samples were transported under chain-of-custody to McCampbell Analytical,Inc. (MAI), a California Department of Health Services-certified laboratory, for analysis for: • Total petroleum hydrocarbons as gasoline(TPH-g)as diesel (TPH-d) and motor oil(TPH- mo)in accordance with EPA Method 8015M; • Volatile organic compounds by EPA Method 8260; and Advanced GwEnvironmental.Inc.