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02 October 2000 AGE-NC Project No. 00-699 Page 4 of 8 approximately 30 feet northeast of the former UST area.The soil boring was advanced using a CME- 75 drill rig,equipped with 8.25-inch diameter hollow-stem augers to advance boring MW 1.The drill rig and three-man crew were supplied by Cascade Drilling.Auger returns generated by drilling were stored on-site,pending laboratory analysis. LAO 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 boring MW 1 every 18 inches, beginning at 5 feet bsg using a 140-pound hammer to advance the sampler. The number of blows required to advance the sampler in 6-inch increments 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. LW For each sample,both ends of the leading sleeve 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 Alpha Analytical Laboratories,Inc. (AAI), a State of California Department of Health Services (DHS)-certified analytical laboratory. �• 3.2. LOGGING Soil was extruded from the 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). ly 3.3. WELL AND BORING COMPLETION Boring MW 1 was completed as a groundwater monitoring well using two-inch diameter PVC casing with 0.010-inch slotted screen installed from approximately 69 feet to 49 feet bsg and with blank casing extended to the surface. The filter pack(No. 2/12 Lonestar sand)was installed from 70 feet to approximately 48 feet bsg.A nominal 2-foot bentonite chipp lug was then installed above the filter pack and hydrated.A water-tight,traffic-rated well box was then installed over the well.An as built well diagram is depicted on the boring log in Appendix A. ' 3.4. LABORATORY ANALYSES OF SOIL SAMPLES Selected soil samples were analyzed for: f Advanced GeoEnvironmental,Inc. L