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z <br /> ' 12 March 1999 <br /> AGE-NC Protect No 95-0121 <br /> Page 2 of 7 <br />' 2 1 1 Equipment Decontamination <br /> The hollow stem augers were steam cleaned prior to each bore hole advancement Following drilling <br />' activities, rinseate generated from decontaminating the equipment was placed in properly labeled <br /> DOT-approved model 17H 55-gallon drums and was stored on-site in an area lacking public access <br /> 212 Logging <br />' Soil sample duplicates from the bottom of each SVE boring (20 feet bsg) and IAS boring (30 feet <br /> bsg) were monitored for the presence of organic vapor using an organic vapor meter equipped with <br /> a photo-ionization detector(PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutyiene) <br /> and were visually described on boring logs according to the Unified Soil Classification System <br /> (USCS) Boring logs are included as Appendix A <br /> 2 13 Soil Vapor Extraction Well Completion <br /> Soil borings VW-3 through VW-9 were single-completed as SVE wells utilizingfive feet t of <br /> schedule 40, 2-inch diameter blank polyvinylchloride (PVC) well casing and 15 feet of perforated, <br /> 2-inch diameter PVC well casing (0 020-inch slot) <br /> Each well was installed by placing the 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 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 Approximately <br /> two feet of bentonite chips (annular seal) were placed above the filter pack and hydrated with clean - <br /> tap water The remaining annular space was backfilled with pordand cement A typical as-built well- <br />'\ construction diagram for wells VW-3 through VW-9 is included as Figure 3 <br /> 2 14 ' In-Situ Air Sparge Well Completion <br /> Soil borings AW-1 through`AW-5 were single-completed as IAS wells utilizing 25 feet of schedule <br /> 40, 2-inch diameter blank polyvinylchloride (PVC) well casing and five feet of perforated, 2-inch <br /> diameter PVC well casing (0 020-inch slot) <br /> Each well was installed by placing the 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 Lonestar Lapis <br /> Advanced Ceo£mironmental,Inc <br />