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• 27 September 1999 AGE-NC Project No 95-0167 Page 5 of 9 • Monitoring well MW-1 was completed with 0 02-inch slotted screen,the screen interval was installed from depths of 15 to 35 feet bsg A filter pack was installed using 43 Lonestar sand from 13 to 35 feet bsg Bentonite clips were used to make a one-foot transition seal above the sand pack • Monitoring wells MW-2 through MW-4 were completed with 0 02-inch slotted screen, the screen interval was installed from depths of 10 to 30 feet bsg A filter pack was installed using #3 Lonestar sand from 9 to 30 feet bsg Bentonite chips were used to make 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 County regulations Monitoring well design specifications are depicted In Appendix B • A summary of monitoring well construction specifications Is presented In Table 2 Following well installation, the wells were developed in order to Increase water flow into the well . and minimize the amount of fine-grained sediment drawn Into the well during pumping or balling 4 4 GROUND WATER MONITORING ACTIVITIES On 29 July, a ground water monitoring event was performed at the site Ground water monitoring activities Included the measurement of ground water levels and collection of ground water samples from the monitoring wells (MW-1 through MW-4) The water level in each monitoring well was measured relative to the tops of the well casings using a Solinst water level meter After water Ievels were measured, a two-stage submersible pump was used to purge each well Ten to twelve gallons (minimum of three well volumes) of water were removed from each well Temperature, pH and conductivity were measured at two-gallon purge- volume intervals using an ICM water analyzer during purging, the measurements had generally stabilized by the end of the purging process (Appendix E) Purged water was stored on-site in 55- gallon, Department of Transportation (DOT)-approved drums 4 5 COLLECTION OF GROUND WATER SAMPLES x Prior to collection of ground water samples,the depth to ground water was measured in each purged . well to ensure that a minimum of 80% of the well volume had recharged Water samples were collected from each well using a new disposable plastic bailer Each water sample was transferred Advanced GeoEnwonmental,Inc