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' 18 May 2006 AGE-NC Project No 04-1239 ' Page 2 of 7 ' generated by drilling were containerized in properly labeled,Department of Transportation(DOT)- approved 55-gallon drums and stored on-site pending disposal Soil samples in all three pilot borings 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 in ' boring MW 12 and at 45 feet bsg in borings MW 13 and MW 14, 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 All sample sleeves were labeled with the sample location, date, time, designation, and sampler's ' initials, then stored on ice and transported under chain of custody to Cal Tech Environmental Laboratories(CTEL),a State of California Department of Health Services(DHS)-certified analytical laboratory in Paramount, California Selected soil samples were analyzed for ' Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified, and ' • p Benzene,toluene,ethylbenzene, and total xylenes(BTEX)and fuel oxygenates di-isopropyl ether (D1PE), methyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dichloroethane (1,2- DCA), and 1,2-dibromoethane (EDB) by EPA Method 8260B All sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to minimize cross-contamination I 212 Logging Soil was extruded from the remaining brass sleeves and visually described in accordance with the Unified Soil Classification System (USCS) by an AGE geologist (Appendix B - boring logs) 2 13 Well Completions Pilot borings MW12 through MW14 were completed as ground water monitoring wells MW-12 through MW-14 using 2-inch diameter, Schedule 40 polyvinylchloride (PVC) casing with a 0 010-inch slotted screen installed from 19 feet to 39 feet bsg in well MW-12 and from 55 feet to . 65 feet bsg in wells MW-13 and MW-14 The filter pack(No 2/12 Lone star sand)was installed from Advanced GeoEnvironmental,Inc I