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' 20 July 1998 AGE-NC Project No 95-0137 Page 3 of 8 ' MW-8,respectively The wells were constricted using two 2-mch diameter,schedule 40 PVC casing with the following designs and material • Wells VW-1 and VW-2 were completed with 0 02-inch slotted screen, the screen interval was installed from depths of 35 to 30 feet bsg and 20 to 5 feet bsg A sand filter pack was installed using #2 Lonestar sand from 35 to 30 feet Bentonite chips were used to make an ' 8-foot plug between the two filter sand packs A filter pack was installed using 42 Lonestar sand from 22 to 5 feet bsg Bentonite chips were used to make a two-foot transition seal ' above the sand pack The remaining annular space was backfilled to the surface with portland cement A traffic-rated well box (12-inch diameter) was installed over each well, in accordance with County regulations ' Monitoring wells MW-6, MW-7 and MW-8 were completed with 0 02-inch slotted screen, the screen interval was installed from depths of 30 to 15 feet bsg A filter pack was installed using#3 Lonestar sand from 30 to 13 feet bsg Bentonite chips were used to make a two-foot transition seal above the sand pack The remaining annular space was backfilled to the surface with portland cement A traffic-rated well box (8-inch diameter) was installed over ' . each well, in accordance with County regulations • As-built monitoring well diagrams are depicted in Appendix B 1 2 14 MONITORING WELL DEVELOPMENT AND PURGING ' On 21 May 1998, a Solmst water level meter was used to measure the depth to ground water in each well relative to the top of the well casings After ground water depth measurements were collected, ' monitoring wells MW-6 through MW-8 and vapor/ias wells VW-I and VW-2 were purged using a two-stage PVC submersible pump Approximately 25 to 30 gallons of water were evacuated from each new monitoring well and approximately 15 gallons of water were evacuated from each new ' vapor/ias well Temperature,pH and conductivity were measured at 3-gallon intervals using an ICM model 5200 water analyzer _ 2 2 MONITORING WELL PURGE PROCEDURES On 29 May 1998,a SoIinst water level meter was used to measure the depth to ground water in wells MW-1 through MW-8 and vaporhas wells VW-I and VW-2 The relative ground water elevation ' in each well The hydraulic gradient were calculated from these data The depths to ground water are summarized in Table 1 - Relative Ground Water Elevation Data Each monitoring well was purged of approximately 6 to 10 gallons of water(a minimum of three,well volumes)per well using Advanced GeoEnvironroental,]ne