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10 May 2000 AGE-NC Project No. 99-0641 Page 2 of 5 quantified as gasoline (TPH-g), total petroleum hydrocarbons quantified as diesel (TPH-d), total — petroleum hydrocarbons quantified as motor oil (TPH-mo), volatile aromatic compounds: benzene, toluene, ethylbenzene, and total xylenes (BTEX), and total lead in accordance with the appropriate EPA Methods. TPH-g and TPH-mo were not detected at concentrations equal to or above laboratory reporting limits _ in the soil samples collected beneath the former UST bottoms. TPH-d was detected in soil sample T3N collected beneath a former UST bottom at a concentration of 100 milligrams per kilogram (mg/kg). BTEX compounds were detected in soil samples collected beneath the former USTs at concentrations as high as 440 micrograms per kilogram (}ug/kg). TPH-g and TPH-mo were detected in soil samples collected from the stockpiled soil at concentrations as high as 6.3 mg/kg and 48 mg/kg, respectively. Lead was detected in one composite soil sample collected from the stockpiled soil at a concentration of 38 mg/kg. PROBING AND SA.NIPLING On 17 March 2000, AGE advanced two soil probe borings at the site. The soil probe borings were advanced using AGE's van-mounted Geoprobe 5400 direct-push probing unit equipped with 1.25- inch probing rods. The Geoprobe advances soil probe borings by hydraulic pushing and/or pneumatic hammering to drive soil and ground water sampling tools to specified depths. Probe borings B 1 and B2 were advanced and sampled to depths of 30 feet below surface grade (bsg), exceeding the proposed 20 feet bsg. Discrete soil samples were collected using the Geoprobe push-dm en 2-inch diameter sampler fitted with four six-inch long brass sleeves at 5-foot intervals, beginning at 5 feet bsg from both soil _ borings. Soil samples were preserved by covering both ends of the second brass sleeve with Teflon sheets, capping and sealing with tape. Each preserved sample sleeve was labeled with soil boring location, depth, time, date and sampler's initials and was stored in a chilled container under ice. Soil samples were field screened for the presence of volatile organic compounds using an organic vapor meter(OVM). Selected soil samples were logged on a chain-of-custody form, transported to — a State of California Department of Health Services (DHS)-certified laboratory and were analyzed for: • TPH-g and TPH-d in accordance with EPA Method 5030/8015M; • BTEX compounds in accordance with EPA Method 8020; Advanced GevEmironmental,Inc_