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' 24 October 2005 . AGE-NC Project No 95-0167 ' Page 2 of 10 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 Sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to minimize cross-contamination ' For each sample, both ends of the second or other selected sleeve were covered with Teflon sheets, capped, and sealed with tape The samples were labeled, 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 laboratory, for analysis for the following constituents ' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) 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 ' • 2 12 Logging Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapor ' using an organic vapor meter (OVM) equipped with a photo-ionization detector (PID Thermo Environmental 580, 10 0 eV,calibrated to isobutylene), OVM readings were recorded on the boring ' logs The soil was then visually described in accordance with the Unified Soil Classification System Boring logs are provided in Appendix B ' 2 13 Well Completions ' Pilot borings MW-7 and MW-8 were completed as ground water monitoring wells of the same designations using 2-inch diameter,Schedule 40 polyvinylchloride(PVC)casing,0 020-inch slotted screen was installed from approximately 10 feet to 25 feet bsg in both borings with blank casing ' extending to the surface The filter pack (No 3 Lonestar sand) was installed from approximately 8 feet to 25 feet bsg, with a nominal 2-foot bentonite chip plug placed above the filter pack and hydrated The wells were grouted from 6 feet bsg to near the surface with portland cement and water- tight,traffic-rated well boxes were installed over the wells As-built well diagrams are depicted on Y _ the boring logs in Appendix B 1 ' Advanced GcoEnvironmentai,Inc