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i <br /> 16 October 1996 <br /> AGE-NC Project No 96-0211 <br /> Page 3 of 6 ' <br /> 1 4 <br /> During drilling, auger returns were monitored for the presence of organic vapors using a photo- <br /> ionization detecior (PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) Auger <br />! returns were stored on-site pending laboratory analysts and disposal at a licenced facility <br /> 3 12 LOGGING <br /> 5 I <br /> Soil was extruded from the second brass sleeve and screened for the presence of organic vapor, using <br />' a PID and the readings were recorded on the boring logs The soil was then descnbed in accordance <br /> t <br /> with the Unified Soil Classification System (see Boring Logs, Appendix A) <br /> 3 1 3 WELL COMPLETION <br /> Barings were completed as two-inch diameter ground water monitoring wells using schedule 40 <br /> PVC casing with 0 02-inch slotted screen from approximately 4 to 14 feet bsg The filter pack, #2 <br /> Lonestar sand, was installed from 2 to 15 feet bsg Bentonite chips were used to make a one-foot <br /> plug and the remaining annular space was backfilled to the surface with Portland cement <br /> A tiaffic-rated well box (8- or 12-inch diameter) was installed over each well, in accordance with <br /> County regulations An `as built' monitoring well diagram is depicted in Appendix B <br /> 3 2 MONITORING WELL PURGE PROCEDURES <br /> 3 2 1 WELL DEVELOPMENT AND PURGING <br /> On I 1 July 1996, a Solin`st water level meter was used to measure the depth to ground water in each <br /> well relative to the tops of the well casings The ground water elevation in each well was determined <br /> fromlthese data Ground water elevations are summarized in Table 1 <br /> After ground water depth measurements were collected, each monitoring well was purged using a <br /> two-stage submersible pump Approximately 20 gallons of water(minimum of 3 well volumes)were <br /> J <br /> evacuated from monitoring wells MW-1 and MW-2 Due to poor well recharge, only.-three gallons <br /> of water were rerrioved from monitoring well MW-3 Temperature, pH and conductivity were <br /> measured at,2-gallon intervals (except for MWµ3), using an ICM model 52200 water analyzer <br /> Ground water parameters stabilized during purging Stabilization data and field logs are included in <br /> Appendix C Purged water was contained in 55-gallon drums for temporary storage on-site <br /> r <br />