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02 February 2000 <br /> AGE-NC Project No 97-0301 <br /> 1 Page 4 of 7 <br /> 2 2 QUARTERLY MONITORING AND SAMPLING ACTIVITIES <br /> On 20 December 1999, ground water monitoring and sampling was performed on monitoring wells <br /> MW-1,MW-2,MW-3 and MW-4 Depths to ground water and total well depths were measured to <br /> the nearest 0 01-foot utilizing a Solmst water level meter Ground water elevations were calculated <br /> by subtracting the depth to ground water from the surveyed casing elevations(Table 2),ground water <br /> ' elevations were plotted and contoured on a scaled site plan (Figure 9) <br /> The ground water levels from all four monitoring wells achieved a mimmum of 80 percent recharge <br /> prior to sample collection Ground water samples were collected utilizing disposable polyethylene <br /> bailers Ground water samples from the four wells were transferred into EPA-approved 40-m1 VOA <br /> vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and into one-liter amber <br /> bottles Care was taken to ensure that visible air bubbles were not present in the VOAs after filling <br /> ' 1 with the well designation, date time <br /> and capping The ground water sample containers were labeled gn , <br /> and sampler's initials <br /> ' <br /> Following collection, each sample was togged on a chain-of-custody form, placed in a chilled <br /> . container and transported to a DHS-certified laboratory for analysis in accordance with <br /> - d <br /> • EPA Method 8015 Modified for TPH g, TPH-d an TPH-k, <br /> • EPA Method 8020 for BTEX with MTBE, and <br /> • EPA Method 8260 Modified for TBA,DIPE, ETBE, TAME and MTBE <br /> ' The results of the analysis are contained in Table 3 <br /> 1 <br /> 3.0. FINDINGS <br /> ' Soil descriptions were utilized to construct geologic cross sections of the site Field data was utilized <br /> to select samples for laboratory analysis and to determine ground water flow direction and gradient <br /> Hydrocarbon impact to soil and ground water was assessed and quantified by laboratory analysis <br /> Laboratory analysis of fifteen soil samples detected TPH-g, TPH-d, TPH-k and BTEX compounds <br /> in three soil samples, no fuel oxygenated compounds were detected during the laboratory analysis <br /> 31 STRATIGRAPHY <br /> Generally, a pale gray to dark brown, very stiff to hard, fine sandy silt was encountered between 5 <br /> feet bsg and 10 feet bsg A pale brown to pale gray, moist, medium dense to dense, silty fine sand <br /> Advanced GeoEnvironmentai,Inc <br />