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08 October 2002 .�` AGE-NC Project No. 98-0468 ' Page 2of6 , 2.1.- DRILLING On 18,20 and 23 February'and 08 March 2002,soil borings(B8,B9 and B10)were advanced at the site using a truck-mounted,CME-75 drill rig equipped with continuous flight 8.25-inch augers.The ' drill rig and two-man crew were provided by West Haz Mat Drilling of Rancho Cordova,California. Boring B8 was advanced to a total depth of 71 feet bsg,boring B9 was advanced to 75 feet bsg and ' boring B10 was advanced to 60 feet bsg.' , ' 2.2. GRAB GROUND WATER SAMPLE COLLECTION AND ANALYSIS Boring B8 and B9 were sampled for the collection of discrete ground water utilizing a HydroPunch ' water sampling assembly fitted with a pre-cleaned 2-inch diameter,0.01-inch slotted temporary well screen. The ground water sample was extracted by lowering a Teflon bailer into the screen section of the temporary wells. After sample retrieval, the water sampler was disassembled and cleaned. A new Teflon bailer was used to collect the sample. Grab ground water was sampled at depths of 60 and 71 feet bsg in boring B8 and 60 and 70 feet bsg • in boring B9. Each sample was transferred into three laboratory-supplied, 40-m1 volatile organic analysis (VOA) vials containing 0.5 ml hydrochloric acid (18%) as sample preservative. The containers were labeled and placed in a chilled container under ice, and transported under chain-of- custody to McCampbell Analytical Inc. (MAI), a Department of Health Services (DHS)-certified laboratory in Pacheco, California. ' Selected ground water samples were analyzed for: •. Total petroleum hydrocarbons as gasoline (TPH-g) in accordance with EPA Method'8015 ' Modified; Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether ' (MTBE) in accordance with EPA Method 8020 Modified; and • Fuel.-additives including MTBE, tertiary-butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), ethylene dibromide ' (EDB) and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260M. DECONTAMINATION 2.3. EQUIPMENT DECONT N O The hollow stem augers and water sampling tools were,steam-cleaned prior to utilization at each ' boring location. Wash and rinse water generated from decontaminating the equipment was placed . . g g g . in properly labeled DOT-approved model 17H 55-gallon drums and stored on-site. ' Advanced GeoEnvironmental, Inc.