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1.,2 June 1996 <br /> AGE-NC Project No. 95-0130 <br /> FINDINGS <br /> 41. RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The relative elevation of ground water in each well was calculated by subtracting the ground water <br /> asing elevation (Table 1 <br /> depth from the surveyed relative c - Ground y�ater Elevations). Ground <br /> to 51.35 feet. Ground water at <br /> water depths at the site ranged from 50.30 the site rose an average of <br /> 80 feet between January 1996 and April 1996. <br /> Ground water is.currently 5 to 10 feet above the tops of the screen intervals of monitoring wells <br /> the to of the screen interval -5. <br /> jviW;l through MW-4, and is approximately 0.5 feet belowp of MW <br /> t Ground water.flow direction at the site is generally toward the southeast at an approximate gradient <br /> of'0.006-ft/ft, or 32 feet per mile (Figure 3 -Relative Ground Yi aler Elevations p) <br /> ,4.2:. : LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> •. _ TPH was detected in ground water samples from well MW-2,MW-3, and MW-5 at concentrations <br /> g <br /> '.-of: 86Q'par-ts per billion (ppb, reported as micrograms per liter), 150 ppb, and 13,000 ppb, <br /> `respectively. <br /> :;:�Beniene was detected in ground water samples from wells MW-2 through MW-5 at concentrations <br /> U <br /> of 83 ppb, 2:7 ppb, 2.8 ppb,.and 2,000 ppb, respectively. Toluene, ethyl benzene and xylene were <br /> -''Y -,•• - <br /> ;detected in:wells MW-2, MW-3 and MW-5 at concentrations ranging from non-detect to 1,000 ppb. <br /> MTBE"was detected in:ground water samples collected from MW-2 and MW-4 at concentrations <br /> 58 ppb,and 0.53 ppb,respectively. The analytical results of ground water samples are summanzed <br /> ;11-Table 2::The laboratory report (CAL Laboratory No. 742) and chain-of-custody are included in <br /> Appendix B. <br /> 5.0:- CONCLUSIONS & RECOMMENDATIONS <br /> Y`.Ground water flow direction and gradient has remained relatively constant at the site over the past <br /> ear.Monitorin well MW-S is located up-gradient of the UST area, while monitoring well MW-4 <br /> _' _ is•located'down-gradient. <br /> H- concentrations in well MW-2 increased, while TPH-g concentrations in <br /> DI'= ApH1.1996, TP g <br /> wells MW-3 and MW-5 decreased. BTE&X concentrations increased in wells MW-2 and MW-4, <br />