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i 04 October 2000 AGE-NC Project No 97-0290 Page 2 of 9 ' 20 feet bsg in SW3 and SW4, 15 feet bsg in SW5, SW8, and SW9, and 10 feet bsg In SW6 and SW7 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 I logs Sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to avoid cross-contamination I 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 McCampbell Analytical, Inc (MAI), a State of California Department of Health Services I (DHS)-certified analytical laboratory 22 LOGGING Soil 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 Sall Classification System (see Appendix A) I23 WELL AND BORING COMPLETION Borings VW2 through VW7 were completed as vapor extraction wells using two-inch diameter AVC casing with 0 020-Inch slotted screen VW2 was drilled at a 15 degree angle from vertical and was completed to a total depth of 52 feet bsg with two ten-foot screen Intervals V W3 was drilled at 25 I degrees from vertical to a total depth of 55 feet bsg with a 10-, 12-, and 16-foot screen Interval V W4 and VW5 were drilled to a total depth of approximately 50 feet bsg with three ten-foot screen Intervals VW6 and VW7 were drilled to depths of 55 and 50 feet bsg, respectively VW6 was completed with one 15-foot and one 10-foot screen Interval, and V W7 was completed with two ten- foot screen intervals Borings SW3 through SW9 were completed as air sparging wells using two- inch diameter PVC casing with 0 020-Inch slotted screen SW3 and SW9 were drilled to a total depth of 60 feet bsg with a 2 5-foot screen Interval SW4, SW6, and SW8 were drilled at 25 degrees from vertical to a total depth of 66 feet bsg with a 2 5-foot screen Interval SW5 and SW7 were drilled at 10 degrees from vertical to a total depth of 61 feet bsg with a 2 5-foot screen Interval The filter pack (No 2/12 Lonestar sand) was installed approximately 0 5 feet to 2 feet above the screened Intervals in wells VW2 through VW7 and SW3 through SW9 A nominal 1 5-foot to 4-foot Ibentonite pellet 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 Appendix A AdvarrcedCeoEnvironmental,Inc