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' 25 November 2001 A AGE-NC Project No 99-0592 ' Page 2 of 6 ' i ' 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 ' To preserve each collected sample, both ends of the leading 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 McCampbell Analytical, Inc (MAI), a State of California Department of Health Services (DHS)-certified analytical laboratory ' 2 2 LOGGING OG G iSoil was extruded from a second brass sleeve and was screened for the presence of organic vapor using an organic vapor meter (OVM) equipped with a photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene), and the OVM readings were recorded on the boring log The soil was then visually described in accordance with the Unified Soil Classification System (see Appendix A) 1* 2 3 WELL AND BORING COMPLETION Pilot borings MW-2, MW-3 and MW-4 were completed as ground water monitoring wells using two-inch diameter PVC casing with 0 020-inch slotted screen installed from approximately 75 feet to 55 feet bsg and with blank casing extended to the surface The filter pack (No 3 Lonestar sand) was installed from 75 feet to approximately 53 feet bsg A nominal 2-foot bentonite chip plug was then installed above the filter pack and hydrated The wells were then grouted to near surface grade with portland cement Water-tight, traffic-rated well boxes were then installed over the wells ' As-built well diagrams are depicted on the boring logs in Appendix A I r Ir 2 4 LABORATORY ANALYSES OF SOIL SAMPLES Selected soil samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g) in accordance with EPA Method 8015 Modified, i • Volatile aromatic hydrocarbons-benzene,toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020, Advanced GeoEnvironmental,Inc i i