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. 13 September 2001 ' AGE-NC Project No 95-0128 Page 2 of 7 ' Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler loaded with three pre-cleaned 2-inch by 6-inch brass sleeves The samples were collected from ' monitoring well pilot borings MW 13 through MW 16 at five-foot intervals, beginning at 25 feet bsg to total depth using a 140-pound hammer to advance the sampler The number of blows required to advance the sampler over each 6-irich 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 avoid cross-contamination ' For each sample collected, 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 22 LOGGING lieSoil 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 I Borings MW 13 through MW 16 were completed as ground water monitoring wells MW-13 through MW-16 using two-inch diameter PVC casing with 0 020-inch slotted screen installed from approximately 25 feet to 45 feet bsg and with blank casing extended to the surface The filter pack (No 3 Lonestar sand) was installed from 45 feet to approximately 24 feet bsg in the annular space around the well screen and casing A nominal 2-foot bentonite chip plug was then installed above the filter pack and hydrated The wells were then grouted to near the surface 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 IAppendix A I • I Advanced GeoEnvxronmeWid Inc