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25 July 1995 <br /> AGE-NC-95-0130 <br /> Page 2 of 4 <br /> USTs are located in this area The fill ports are blocked at depths of approximately eighteen inches <br /> below surface grade, so the volume of the tanks can not be determined A plan to remove the <br /> remaining USTs is presently being considered by the property owners <br /> 3.0. PROCEDURES <br /> 3 1 MONITORING WELL SAMPLING <br /> On 24 April 1995,ground water depths m all the wells were measured relative to the top of the casing <br /> using a Solinst water level meter The relative piezometric levels and hydraulic gradient were <br /> determined from these data(Table 1) <br /> After ground water depths were measured, a clean PVC bailer was used to purge standing water <br /> from each well Approximately 10 gallons were removed to stabilize temperature, pH and <br /> conductivity (Appendix B) Stabilization parameters were measured at one-gallon intervals using a <br /> ICM water analyzer Purge water was placed in 55-gallon DOT drums and stored on-site <br /> Stabilization field sheets are included in Appendix A <br /> Ground water samples were collected from each well using a new, disposable plastic bailer Samples <br /> were collected in 40-m1 EPA VOA vials, logged on a chain-of-custody and placed in a chilled <br /> container for transmittal to a State-certified laboratory <br /> 3 2 LABORATORY ANALYSIS OF WATER SAMPLES <br /> The ground water samples were transported to ABC Laboratories - Pan-Ag Divsion and analyzed <br /> for TPH-g and BTE&X in accordance with EPA methods 5030/8015m and 602, respectively <br /> 4.0. FINDINGS <br /> 4 1 RELATIVE GRADIENT ELEVATION AND GRADIENT <br /> The relative elevation in each well was calculated by subtracting ground water depth from the <br /> surveyed casing elevation(Table 1) The ground water gradient was calculated to be 0 0016ft/ft or <br /> 0 9°, flowing S 60° E (Figure 3) <br />