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' 07 September 2005 AGE-NC Project No 98-0540 ' Page 3 of 9 ' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified, and • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and the fuel additives methyl ' tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether(TAME),tertiary-butyl alcohol(TBA), 1,2-dibromoethane(EDB), and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B All rinseate generated during drilling activities was containerized in properly labeled,DOT-approved ' 55-gallon drums and stored on-site in an area lacking public access The twinned soil boring was backfilled over its entire depth with a portland cement grout mix ' 2 2 MONITORING WELL INSTALLATION AND DEVELOPMENT ' Two additional ground water monitoring wells(MW-4 and MW-5)were installed on 09 and 10 June 2005, developed on 13 June 2005, and sampled on 14 June 2005 2 2 1 Drillingd Sampling anp g ' On 09 and 10 June 2005, a CME-75HT truck-mounted drill rig was utilized to advance pilot soil borings MW-4 and MW-5 to 93 feet and 95 feet bsg,respectively,using 8 25-inch diameter hollow- stem augers The drill rig and three-man crew were supplied by Mitchell Drilling Environmental of Eureka,California Auger returns generated by dnIling were containenzed in properly labeled,DOT- approved 55-gallon drums and stored on-site pending proper disposal ' Soil samples were collected ahead of the drill bit using a California modified, 18-inch split-spoon sampler loaded with three pre-cleaned, 2-inch by 6-inch brass sleeves The samples were collected ' from the pilot borings at 5-foot intervals, beginning at 5 feet bsg, using a 140-pound hammer to advance the sampler The number of blows required to advance the sampler over each 6-inch increment of the 18-inch sampling interval was recorded on the boring logs After sample recovery, ' both ends of the middle sleeve were covered with Teflon sheets, capped, and sealed with tape The sample sleeves were labeled, stored on ice, and transported under chain of custody to CTEL for analysis Selected soil samples were analyzed for the constituents listed in Section 2 12 ' All sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to minimize cross-contamination ' Advanced GeoEnvironmental,Inc