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M <br /> 25 August 1 <br /> 999 <br /> AGE-NC Project No 98-0448 <br />' Page 3 of 10 r <br /> I213 Logging <br /> Dunng,dnllmg activities, sample duplicates were monitored for the presence of organic vapor using <br />' an organic vapor meter equipped with a photo-ionization detector (PID Thermo Environmental <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 logs are included as Appendix A <br />' 2 14 Ground Water Well Completion <br /> Soil boring MW-8 was single-completed as a ground water monitoring well utilizing schedule 40, <br />' 2-inch diameter blank polyvinylchloride (PVC) well casing and perforated, 2-inch diameter PVC <br /> well casing (0 010-inch slot), soil boring EW-1 was single completed as a ground water extraction <br /> well utilizing schedule 40, 6-inch diameter blank PVC well casing and perforated, 6-inch diameter <br />' PVC well casing (0 010-inch slot) <br /> lie <br /> Each well was installed by placing a PVC well casing assembly through the hollow stem of the <br /> augers to the total depth of the boring The augers were incrementally raised as a No 212 Lonestar <br /> Lapis Luster sand (filter pack) was slowly poured down the annulus between the well casing and the <br />' inner wall of the hollow stem auger The filter pack was placed adjacent to the screened casing from <br /> the bottom of the boring to a point approximately two feet above the top of the screen, following <br /> filter 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`remalning annular space <br /> was backfilled with portland cement As-built well-construction diagrams are included as Figures <br /> I5and 6 <br />' 2 1 5 Well Survey <br />' On 11 August 1999, wells MW-8 and EW-1 were surveyed to the nearest 0 01-foot relative to the <br /> City of Stockton Bench Mark Datum # COS 258 The results of the monitoring well survey are <br /> contained in Table 2 <br /> I <br /> 2 16 Well Development Activities <br />' On 22 June 1999, monitoring wells MW-8 and EW-1 were developed utilizing a stainless steel hand <br /> • <br /> Advanced GcoEn\Ironmental,Inc <br /> J <br />