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i, 15 September 1999 AGE-NC Project No 98-0592 Page 2 of 7 the direction of AGE personnel, and were conducted in accordance with the Preliminary Site Assessment Work Plan dated 26 April 1999, prepared by AGE, as approved by the PHS-EHD 3 1 SOIL BORINGS AND MONITORING WELL INSTALLATION On 10 and I1 June 1999, AGE advanced five borings BI, B2, B3, B4, and B5, to depths of 64, 55, 30, 30, and 55 feet below surface grade (bsg), respectively One of the five borings (B1/MW-1) was completed as a ground water monitoring well Soil borings were advanced utilizing a truck-mounted drill rig equipped with 8-inch diameter hollow stem augers The drill rig and three man crew were supplied by Cal-Nev Drilling of Rancho Cordova, California The soil boring/monitoring well locations are depicted in Figure 2 3 2 SOIL AND GRAB GROUND WATER SAMPLE COLLECTION Discrete soil samples were collected at 5-foot intervals, beginning at 15 feet bsg from soil boring B1, and from 5 feet bsg from borings B2, B3, B4 and B5 Soil samples were collected utilizing a California split-spoon sampler loaded with three 2-inch by 6-mch brass sleeves The sampler was driven by dropping a 140-pound weight from a height of 30 inches The number of blows required to drive each 6-inch interval of the sampler (blow counts) was recorded on boring logs by an AGE staff geologist 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 Selected soil samples were logged on a chain-of-custody, transported to a State of California Department of Health Services (DHS)-certified laboratory and analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 5030/8015M, • Total petroleum hydrocarbons quantified as diesel (TPH-d), and motor oi. (TPH-mo) in accordance with EPA Methods 3550/8015M, • Volatile aromatics (benzene, toluene, ethylbenzene and xylene BTEX) with methyl tertiary- butyl ether (MTBE) in accordance with EPA Method 8020, and • Duel oxygenates, including tertiary butanol (TBA), di-isopropyl ether(DIPS),ethyl tert-butyl ether (ETBE) and tert-amyl methyl ether (TAME) and MTBE in accordance with EPA Method 8260M Adianced GeoEn%ironmtnial,inc