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' 14 August 2000 iAGE-NC Protect No 95-0128 ' Page 2 of 10 ' 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 Sampling equipment was washed in an Alconox solution and rinsed with water pnor to each ' sampling run to avoid cross-contamination For each 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 McCambell Analytical, Inc (MAI), a State of California Department of Health Services (DHS)-certified analytical laboratory I 22 LOGGING ISoil was extruded from a second brass sleeve or from the unpreserved portions of the soil in the core barrel samples and were 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) 2 3 WELL AND BORING COMPLETION Borings MW8 through MW 10 were completed as ground water monitoring wells MW-8 through I MW-10 using two-inch diameter PVC casing with 0 020-mcb slotted screen installed from approximately 45 feet to 25 feet bsg and with blank casing extended to the surface The filter pack (No 2112 Lonestar sand) was installed from 45 feet to approximately 24 feet bsg in boring MW8 and from approximately 45 feet to 23 feet in borings MW9 and MW 10 A nominal 2-foot bentonite chip plug was then Installed above the filter pack and hydrated Bonngs MW11 and MW12 were finished as dual-completed ground water monitoring wells MW- I IA/B and MW-12A/B, using two-inch diameter PVC casing with 0 020-inch slotted screen installed from approximately 60 feet to 55 feet bsg and 45 feet to 25 feet bsg with blank casing extended to the surface The filter pack(No 2112 Lonestar sand) was installed from approximately 60 feet to 54 feet bsg and from approximately 45 feet to 23 feet bsg An Interim filter of No 2112 Lonestar sand was installed from approximately 47 feet to 45 feet bsg in bonngs MW 11 and MW 12 While a bentonite pellet plug was installed from approximately 54 feet to 47 feet bsg and from approximately 23 feet to 21 feet bsg Advanced GeoEnvironmenta!Inc