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' 02 September 2003 i AGE-NC Project No. 98'0468 i ' Page 7 of l 1 ' 4.2.. GROUND WATER SAMPLE COLLECTION Grab ground water and soil samples were collected in a twin soil boring advanced immediately adjacent to the initial CPT boring. The samples were collected utilizing the 25-ton truck-mounted CPT drill rig equipped with 1.75-inch diameter hollow-stem rods fitted with a HydroPunch ground . water or a piston soil sampling assembly,which was pushed to specified sampling depths in each, ' soil boring. Discrete ground water or soil samples were collected based on' the acquired CPT-lithology data ' indicating favorable conditions for sampling. For groundwater, a HydroPunch sampling tool'was pushed into the specified zone, then withdrawn approximately four feet to expose an inlet screen; the interior of the sampling tool filled with water and a 1-inch outer diameter(O.D.) stainless steel '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extract a ground water sample.For soil,a steel-tipped soil sampler was pushed into the specified zone, then,the tip was withdrawn to expose a core barrel; the soil sampler was pushed down again to retrieve a 1-foot soil sample. 1 Ground water samples were collected from the CPT boring locations at the following intervals: ' CPT-1 was sampled between 82 feet and 86 bsg feet bsg and'between 102 feet and 106'feet bsg, CPT-2 was sampled between 55 feet and 59 feet bsg, 71 feet and 75 feet bsg and between ' 102 feet and 106 feet bsg. Following sample collection, the samples were placed in laboratory-supplied containers, properly labeled and transported under chain-of-custody to Cal Tech Environmental Laboratories,Inc(CTEL) of Paramount, a State of California Department of Health Services (DHS)-certified laboratory (#2424). All samples were analyzed far: ' • Total petroleum hydrocarbonsquantified as gasoline (TPH-g) in accordance with EPA Method 8015-Modified; and ' Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8021B The following fuel additives: di-isopropyl ether (DIPE); ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), 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 soil borings were backfilled completely with a Portland cement grout mix. 1 Advanced GeoEnvironmcotal,Inc.