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' 17 April 2002 . AGE-NC Project No. 97-0343 Page 2 of 6 Rinseate generated during drilling activities was containerized in properly labeled DOT-approved 55-gallon drums and was stored on-site in an area lacking public access. The CPT soil borings were backfilled over their entire depth range with a portland cement grout mix. 2.2. GROUND WATER SAMPLE COLLECTION Following advancement of the initial boring to collect litholo is data a H droPunch ground water sampling tool was attached to the hollow-stem rod assembly and utilized to collect grab ground water samples from specified depths of an immediately adjacent, twin soil boring. Ground water samples were collected from the specific depths based on the previously acquired CPT-lithology data indicating favorable conditions for sampling ground water. IThe HydroPunch sample tool was pushed into the specific depth interval, then withdrawn approximately four feet to expose an inlet screen. The interior of the sampling tool filled with water and a 1-inch outer diameter(O.D.)stainless steel bailer was lowered and utilized to extract a ground water sample. Following sample collection, the samples were placed in laboratory-supplied containers,properly labeled 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 and diesel (TPH-g and TPH-d) in accordance with EPA Method 8015-Modified; I • Benzene, toluene, ethylbenzene and total xylenes (BTEX) in accordance with EPA Method 8020; and • The fuel additives methyl tertiary-butyl ether (MTBE), di-isopropyl ether (D1PE), ethyl tertiary-butyl ether (ETRE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260-Modified. All rinseate generated during drilling activities was containerized in properly labeled DOT-approved 55-gallon drums, and was stored on-site in an area lacking public access. The twinned soil borings were backfilled over its entire depth with a portland cement grout mix. 2.3. SOIL SAMPLE COLLECTION Following advancement of an initial boring to collect lithologic data at location CPT-1, a 1.25-inch • diameter piston soil sampling assembly,loaded with two pre-cleaned brass sleeves,was attached to the hollow-stem rod assembly and used to collect a soil sample from 31 feet bsg in the twin CPT IAdvanced GeoEnvironmental,Inc. I