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I <br /> 17 May 1999 <br /> AGE-NC Project No 96-0249 <br /> Page 3 of 9 <br /> 580A, 10 0 eV, calibrated to isobutylene) and were visually described on boring logs in accordance <br />' with the Unified Soil Classification System (USCS) Boring Iogs are included as Appendix A <br /> General lithology beneath the site in cross sectional view is depicted on Figures 3, 4 and 5 <br /> 2 1 4 Monitoring Well Completion <br />' Soil borings MW-1 through MW-6 were single-completed as ground water monitoring wells <br /> utilizing schedule 40, 2-inch diameter blank polyvinylchloride (PVC) well casing and perforated, <br /> 2-inch diameter PVC well casing (0 020-inch slot) <br /> Each well was installed by placing a PVC vaell casing assembly through the hollow stem of the <br /> augers to the total depth of the boring The augers were incrementally raised as Lonestar Lapis <br /> Luster sand (filter pack) was slowly poured down the annulus between the well casing and the inner <br /> wall of the hollow stem auger The filter pack was placed adjacent to the screened casing from the <br /> bottom of the boring to a point approximately two feet above the top of the screen, following filter <br /> pack placement, a surge block was inserted into the well casing and was alternately raised and <br /> lowered(surged)repeatedly for approximately 10 minutes Two feet of bentonite chips(annular seal) <br /> were placed above the filter pack and hydrated with clean tap water The remaining annular space <br /> was backfilled with portland cement As-built monitoring well-construction diagrams are included <br /> as Figures 6 through 11 <br />' 2 1 5 Surveying of Monitoring Wells <br /> On 10 May 1999, AGE surveyed a reference point on the top of wells MW-1 through MW-6 to the <br /> Inearest 0 01-foot relative to the San Joaquin County Bench Mark Datum 4 ZAA-13 4 The results <br /> of the monitoring well survey are contained in Table 2 <br /> 2 1 6 Well Development Activities <br /> IOn 02 April 1999, monitoring wells MW-1 through MW-6 were developed utilizing a Teflon hand <br /> bailer and a two-stage submersible pump <br /> ApproxlmateIy 20 to 30 gallons of ground water were purged from each monitoring well until <br /> ground water produced was visually sediment free Purged ground water was containerized in <br /> properly labeled D O T -approved model 17H 55-gallon drums and was stored on-site In an area <br /> lacking public access Monitoring well field logs for development activities are included In <br /> Appendix B <br /> Advanced GeoEnvironmental,Inc <br />