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10 March 1998 <br /> AGE-NC Project No 95-0135 <br /> Page 5 of 9 4 <br /> • Well MW-1 was completed with 0 02-inch slotted screen, the screen interval was installed <br /> I <br /> from depths of 65#0 60 feet bsg and 45 to 25 feet bsg A bentonite clop and water mix were <br /> used to make a 20-foot plug below the sand pack to fill the void from the bottom of the <br /> boring A'fiIter pack was installed using#2 Lonestar sand from 65 to 58 feet Bentonite chips <br /> were used to make a 13-foot plug between the two filter sand packs A filter pack was <br /> installed using #2 Lonestar sand from 45 to 23 feet bsg Bentonite chips were used to make <br /> a two-foot transition seal above the sand pack The remaining annular space was backfilled <br /> to the surface with portland cement A traffic-rated well box (8-inch diameter) was installed <br /> over each well, in accordance with County regulations <br /> • Well MW-2 'was completed with 0 01-inch slotted screen, the screen interval was installed <br /> from depths of 65 to 60 feet bsg and 45 to 25 feet bsg'A filter pack was installed using#2112 <br /> Lonestar sand from 65 to 58 feet and from 45 to 23 feet bsg Bentonite chips were used to <br /> make a 13-foot plug between the two filter sand packs Bentonite chips were used to make <br /> a two-foot transition seal above the sand pack The remaining annular space was backfilled <br /> to the surface with portland cement <br /> • Wells MW-3 was completed with 0 01-inch slotted screen, the screen interval was installed <br /> ifrom depths of 65 to 60 feet bsg and 40 to 20 feet bsg,A filter pack was installed using #2/12 <br /> Lonestar sand from 65 to 58 feet and 40 to 18 feet bsg Bentonite chips were used to make <br /> an 18-foot plug between the two filter sand packs The bentonite chips expanded beyond <br /> their anticipated volume and therefore reduced boring volume Bentonite chips were again <br /> to used to make a two-foot transition seal above the sand pack The remaining annular space <br /> was backfilled to the surface with portland cement I n <br /> A traffic-rated well box (8-inch diameter) was installed over each well, in accordance with <br /> County regulations , <br /> • As-built monitoring well diagrams are depicted in Appendix B <br /> 3 3 MONITORING WELL SURVEY AND PURGE PROCEDURES <br /> On I$ December 1997, the casing elevation of each new well was surveyed relative to the elevation <br /> of the City of Stockton Bench Mark number 28 (BM#28- 12 IT) On 24 September 1997, a Solinst <br /> water level meter was used to measure the depth to ground water in each well relative,to the top of <br /> the well casings After ground water depth measurements were collected, each monitoring well was <br /> purged using a two-stage submersible pump Approximately 6 to 8 gallons of water (minimum of <br /> I 3 well volumes per well) were evacuated from upper screens, while 18 gallons of water were from <br /> lower screens of the wells MW-I(A/B)through MW-3(A/B) Temperature,pH and conductivity of <br /> the purging water were measured at 2-gallon intervals using an TCM model 52200 water analyzer <br /> Advanced GeoEm ironmental,Inc <br />