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30 June 1995 <br /> AGE-NC-95-0101 <br /> Page 3 of 6 <br /> B9 was advanced to a depth of 75 feet,boring B 10 was advanced to a depth of 80 feet Soil cuttings <br /> were placed in 55-gallon drums and stored on-site <br /> For both borings, discrete soil samples were collected ahead of the drill bit at 5-foot intervals using <br /> a split-tube sampler loaded with pre-cleaned 2-inch by 6-inch brass sleeves To avoid cross <br /> contamination, the sampling equipment was washed in an alconox solution and rinsed twice with <br /> water prior to each sampling run For each sample, both ends of the lead tube were covered with <br /> aluminum sheets, capped and sealed with tape <br /> Ground water was allowed to enter the bottom of both bonngs A ground water sample was then <br /> collected from each boring using a disposable bailer Samples were collected in 40ml EPA vials <br /> preserved with hydrochloric acid <br /> Samples were then stored on ice and transported under chain-of-custody to McCampbell Analytical, <br /> Inc (MAI) in Pacheco, California Selected samples were analyzed for TPH-g and BTE&X in <br /> accordance with EPA methods 8015m/GCFID5030 and 80201602, respectively <br /> 3 2 LOGGING <br /> Soil was extruded from the second brass tube and screened for the presence of organic vapors using <br /> a photo-ionization detector(PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene), <br /> and the readings were recorded on the Boring Logs The soil was then described in accordance with <br /> the Unified Soil Classification System(see Boring Logs, Appendix A) <br /> 3 3 BORING COMPLETION <br /> Boring B9 was backfilled from 80 feet to 50 feet with Portland Cement and bentonite The boring <br /> was then completed as vadose zone well VW-1 using 2-inch diameter, 0 020 slotted PVC casing from <br /> 30 feet to 50 feet Blank PVC casing was installed from the surface to a depth of 30 feet The filter <br /> pack (#3 Lonestar Sand) was installed from 29 feet to 50 feet, a bentonite plug was installed from <br /> 26 feet to 29 feet, and the boring was backfilled to the surface with Portland Cement Boring B 10 <br /> was backfilled in the entire depth with Portland Cement <br /> 3 4 MONITORING WELL PURGE PROCEDURES <br /> On 8 May 1995, a Sohnst water level meter was used to measure the depth to ground water to each <br /> well relative to the top of the casing The relative ground water elevations and hydraulic gradient <br />