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10 January 2001 AGE-NC Project No 98-0521 Page 3 of 7 _ I The monitoring well was designed with a 0 02-mch slotted screen installed from depths of approximately 5 to 20 feet bsg and with blank casing extending to the surface A falter pack of#2112 Lonestar sand was installed from 4 to 20 feet bsg Bentonite chips were used to create a one-foot transition seal above the sand pack The remaining annular space was backfilled to within six inches of surface grade with portland cement A traffic-rated well box (8-inch diameter) was installed over _ each well, in accordance with San Joaquin County regulations Monitoring well design specifications are depicted on the^boring logs to Appendix A- On 16 October 2000, well MW-4 was developed in order to increase water flow into the well and to minimize the-amount of fine-grained sediment drawn into the well during purging and sampling 3 3 GROUND WATER MONITORING ACTIVITIES On 07 September 2000, ground water monitoring activities were performed at the site The ' monitoring activities included the measurement of depths to the ground water surface within wells and collection of ground water samples from the three monitoring wells The water level in monitoring wells MW-1 through MW-3 were measured relative to the tops of the well casings using a Solinst water level meter After water levels were measured, a two-stage submersible pump was used to purge each well Ten gallons (a minimum of three well volumes) of ' - water were removed from wells MW-1 and MW-3 and twenty-seven gallons of water were removed from well MW-2 ' -On 20 October 2000, one ground water monitoring well was sampled The sampling activities included the measurement of ground water levels and collection of ground water samples from the newly installed monitoring well MW-4 The water level in monitoring wells MW-1 through MW-4 was measured relative to the tops of the ' well casings using a Solinst water level meter After the water levels were measured, a two-stage r submersible pump was used to purge only well MW-4 Six gallons(a minimum of three casing-water volumes) of water were removed from well MW-4 t - - Temperature, pH and conductivity of the purged water were measured at two-gallon intervals for MW-1, MW-3 and MW-4 and nine-gallon intervals for MW-2 Temperature, pH and conductivity ' of the purged water was measured using an ICM water analyzer (Appendix B) Purged water was stored on-site in 55-gallon, DOT-approved drums - t Advanced GeoEnvironmental,Inc Tr - ,