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■ <br /> 18 September 1998 <br /> AGE-NC Project No 95-0173 <br /> Page 4 of 8 <br /> depths and total well depths were measured in wells MW-i through MW-12, VW-1, AW-1 B and <br /> AW-2B to the nearest 0 01 foot utilizing a Solinst water level meter Ground water elevations were <br /> calculated by subtracting the depth to ground water from the surveyed casing elevations (Table 2) <br /> Ground water elevations were plotted and contoured on a scaled site map (Figure 6) <br /> After water levels were measured, a minimum of three well volumes of ground water were purged <br /> from wells MW-1 through MW-12, VW.1, AW-1B and AW-2B by hand bailing and using a two- <br /> stage submersible pump Ground water stabilization parameters, including temperature, pH and <br /> conductivity, were measured at regular purge volume intervals utilizing an ICM model 52200 water <br /> analyzer Stabilization data and field logs are contained in Appendix C Purged ground water was <br /> stored in 55-gallon drums on-site in an area lacking public access <br /> The ground water levels from monitoring wells MW-1 through MW-12,VW-1,AW-1B and AW-2B <br /> achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were <br /> collected utilizing disposable polyethylene bailers Upon retrieval, each sample was transferred to <br /> EPA-approved 40-m1 VOA vials,containing 0 5 ml 18%hydrochloric acid as a sample preservative, <br /> and into 1-liter amber bottles Care was taken to ensure that visible air bubbles were not present in <br /> 10 the VOAs after filling and capping Ground water sample containers were labeled with the well <br /> designation, date, time, and sampler's initials <br /> Following collection, each sample was logged on a chain-of-custody form, placed in a chilled <br /> container and transported to a DTSC-certified laboratory in accordance with <br /> E • EPA Method 8015M for TPH-g and TPH-d, respectively, <br /> • EPA Method 8020 for BTEX with MTBE, and <br /> • EPA Method 8260 for TBA, DIPE, ETBE and TAME, and to confirm and quantify MTBE <br /> if detected by EPA Method 8020 <br />' The results of the analysis are contained in Table 3 <br /> 3.0. FINDINGS <br /> Results of field observations and laboratory analysis of soil and ground water samples are as follows <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />