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' 08 June 2001 AGE-NC Pioject No 95-0137 ' Page 2 of 9 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 prior to each sampling run to reduce cross-contamination For each recovered sample, both ends of a 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 ' 22 LOGGING ' Soil was extruded from a second brass sleeve or froze 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 t (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 ' �_ Pp �'Rgs )I, Bonngs IAS 1 through IAS4 were completed as air sparging wells using two-inch diameter PVC casing with 0 020-inch slotted screen Each well y1e drilled to a total depth of 25 feet bsg and was ' completed with a 5-foot screen interval as Borings VW3A, VW8 and VW9A were completed as vapor extraction wells using two-inch diameter PVC casing with 0 020-inch slotted screen These borings were drilled to a total depth of approximately 13 feet bsg and completed with a 5-foot screen intervals ' Borings VW3B,VW4, VW5, VW6, VW7, VW9B , VWIO and VW11 were completed as vapor extraction wells using two-inch diameter PVC casing with 0 020-inch slotted screen These borings were drilled to a total depth of approximately 18 feet bsg and completed with a 5-foot screen ' intervals i ' The filter pack (No 2112 Lonestar sand) was installed approximately I foot above the screened intervals in the air-sparge wells IAS-1 to IAS-4 and vapor wells VW-3 through VW-I 1 A nominal 1 5-foot bentonite 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 1 Advanced GcoEnviron[nental,Inc 1