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! 1 Ile 29 December 2000 AGE-NC Project No 96-0235 ' Page 3 of 8 - ' 2 4 LOGGING ,Soil was extruded from a second brass sleeve or from the unpreserved portions of the soil in the core ' barrel samples and was 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 ' 2 5 WELL AND BORING COMPLETION , Borings MW-11A through MW-13B were completed as ground water monitoring wells MW-11A ' through MW-13B using two-inch diameter Schedule 40 PVC casing with 0 020-inch slotted screen, borings EW-1 and EW-2 were completed as ground water extraction wells EW-1 and EW-2 using ' four-inch diameter Schedule 40 PVC casing with 0 020-inch slotted screen, boring AS-1 was completed as an in-situ air sparging well using two-inch diameter Schedule 40 PVC casing with 0 020-inch slotted screen Soil borings MW-11A, MW-12A, MW-13A and EW-1 were advanced to 30 feet bsg, soil borings MW-11B, MW-12B, and MW-13B were advanced to 45 feet bsg, soil boring EW-2 was advanced ' to 50 feet bsg and soil boring AS-1 was advanced to 60 feet bsg Wells MW-11A, MW-12A, MW-13A and EW-1 were installed using 20 feet of screen from ' 'approximately.l 0 feet to 30 feet bsg and with blank casing extended to the surface Wells MW-11 B, MW-12B, and MW-13B were installed using 5 feet of screen from approxnnately 40 feet to 45 feet bsg Ground water extraction well EW-2 was installed using 20 feet of screen from approximately ' 30 feet to .50 feet bsg Air sparging well AS-1 was installed using 5 feet of screen from approximately 55 feet to 60 feet bsg The filter pack for MW-11A, 12A, 13A and EW-1 (No 3 Lonestar sand) was installed from 8 feet ' to 30 feet bsg The filter pack for MW-11B, MW-12B and MW-13B was mstalled from 38 feet to W 45 feet,bsg in the borings The filter pack for EW-2 was installed from 28 feet to 50 feet bsg in the borings The filter pack for AS-1 was installed from 53 feet to 60 feet bsg in the borings A nominal 2-foot bentonite-pellet plug was then installed above the filter pack in MW-11A through MW-13B and EW 1 and EW-2 A nominal 3-foot bentonite-chip plug was installed above the filter pack in AS-1 The bentonite plugs in the wells were hydrated for approximately thirty minutes The ground water monitoring wells were 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 C Advanced C,eoEuvironinental,Inc