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i 23 April 2001 • AGE-NC Project No 96-0263 Page 2 of 5 2 2 GROUND WATER SAMPLE COLLECTION Following advancement of an initial boring to collect lithologic data,the CPT drill ng equipped with a HydroPunch ground water sampling tool was utilized to collect grab ground water samples from specified depths of a twin soil boring The HydroPunch sample tool was pushed into the specified zone, then withdrawn approximately four feet to expose an inlet screen The interior of the sampling I tool filled with water and a 0 5-inch outer diameter (O D ) stainless steel bailer was lowered and utilized to extract a ground water sample Ground water samples were collected from selected depth intervals (zone) based on previously acquired CPT-lithology data interpreted to indicate favorable ' conditions for sampling ground water All rinseate generated during drilling activities was containerized in properly labeled DOT-approved 55-gallon drums, and was stored on-site The twinned soil borings were backfilled over their entire depth with a portland cement grout mix ' Followmg sample collection, the samples were placed in laboratory-supplied containers and transported under chain-of-custody to McCampbell Analytical Inc (MAI), a California Department ' of Health Services (DHS)-certified laboratory Samples were analyzed for ' . • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 503018015-modified, • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether ' (MTBE) in accordance with EPA Method 8020, • Fuel oxygenates - MTBE, di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), ' tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) in accordance with EPA Method 8260M, and • Ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA ' Method 8260M ' 23 SOIL SAMPLE COLLECTION ' The CPT drill rig, equipped with 2-inch diameter hollow-stern rods fitted with 1 25-inch diameter piston soil sampling assembly loaded with a pre-cleaned brass sleeve, was used to collect soil samples from 35 feet and 44 feet bsg in the twin of boring CPT-2 and from 30 feet bsg in the twin ' of boring CPT-3 ' Upon soil sample retrieval, the brass sleeve was removed from the sampler The ends of the brass sleeve were immediately covered with Teflon sheets, sealed with plastic end caps, secured with tape . and immediately placed in a chilled container for transportation to a DHS-certified laboratory Each ' Advanced GeoEnvironmental,lac