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1 <br /> 1 . 15 August 1996 <br /> d g � <br /> AGE-NC Project No. 95-0185 <br /> Page 5 of 8 <br />' volumes)to diminish the amount of silt content in each well's filter pack. Thirty gallons of water <br /> were removed from MW-4 to develop the well filter pack. <br /> Ground water parameters were measured at four-gallon intervals,using an ICM water analyzer,until <br /> temperature,pH and conductivity had stabilized (Appendix D). Purged water was stored on-site in <br /> 55-gallon DOT drums. <br /> 1 <br />' 3.2.5. COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each well using a new disposable plastic bailer. Each water <br />' sample was collected in two 40-m1 VOA vials and one 1-liter amber bottle. After collection, the <br /> samples were placed in a chilled container and transported under chain-of-custody to MAI. Each <br /> sample was analyzed for TPH-g, TPH-d, BTE&X and MTBE in accordance with EPA methods <br />' 5030/8015m, 5030/8015m, 602 and 602, respectively. <br /> 4.0. FINDINGS <br /> 4.1. STRATIGRAPHY <br />' Fine to coarse-grained, silty and clayey sand was encountered in each boring p from depths of <br /> approximately 5 to 20-feet bsg. Silty sand and coarse-grained sand were encountered from depths <br />' of 20 to 33 feet bsg at the site. Ground water was encountered at depths of approximately 18 to 21 <br /> feet bsg in each boring at the site. Figures 4 and 5 are stratigraphic cross sections of the site, showing <br /> general lithology and hydrocarbon-impacted soil. <br /> 1 <br />' 4.2. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The relative elevation of ground water in each well was calculated by subtracting the ground water <br /> depth from the surveyed casing elevation (Table 1). Monitoring well casing elevations were <br /> surveyed relative to a MW-4, which was assigned an arbitrary elevation of 60 feet above sea level. <br /> The relative ground water elevation ranges from 39.70 feet in MW-4 to 40.00 feet in MW-1. <br /> The relative ground water elevation at the site are contoured ori Figure 3 -Relative Ground Water <br /> Elevation. Ground water flow at the site varies from southeast to northeast toward an eastward <br /> plunging trough between MW-1 and MW-2. The regional ground water flow direction is generally <br /> southwest and the observed gradient is a variation from the regional trend.This variation may be due <br /> in part to seasonal changes in the local ground water flow patterns: <br /> F <br /> 1. <br />