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I07 March 2002 . AGE-NC Project No 99-0637 ' Page 2 of 6 generate a general lithology type and display on a CPT boring log (See Appendix A) 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 soil borings were backfilled over their entire depth range with a portland cement grout mix 2 2 GROUND WATER SAMPLE COLLECTION Following advancement of an initial boring to collect lithologic data,the CPT drill rig equipped with a HydroPunch ground water sampling tool was utilized to collect gab ground water samples from specified depths of the twin soil boring The HydroPunch sample tool was pushed into the specified zone,then withdrawn approximately four feet to expose an inlet screen The Interior of the sampling Itool filled with water and a 1-mch outer diameter (O D ) stainless steel bailer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 Indicating favorable conditions for sampling groundwater All rinseate generated dunng dnlling activities was containerized In properly labeled DOT-approved 55-gallon drums,and was stored on-site in an area lacking public access The lietwinned soil boring was backfilled over Its entire depth with a portland cement gout mix Following sample collection, the samples were placed in laboratory-supplied containers and I 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 • Fuel additives - methyl tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl I tertiary-butyl ether (ETBE), 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 I I23 SOIL SAMPLE COLLECTION Following advancement of an initial boring to collect lithologic data,the CPT drill rig equipped with Ia 1 25-inch diameter piston soil sampling assembly loaded with two pre-cleaned brass sleeves,was • used to collect a soil sample from 35 feet bsg in the twin of boring CPT-1 Advanced GeoEnvironmental,Inc