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i <br /> 18 April 1997 <br /> AGE-NC Project No 95-0141 <br />' Page 4 of 5 <br /> In February 1997, the gradient was calculated at 0 005 ft/ft(approximately 26 feet per rile) Ground <br /> water monitoring data collected in the area of MW-1 through MW-3 suggested that ground water <br /> flow direction was toward the north, northeast and northwest Ground water elevation contours <br /> appear to have a domed configuration in the MW-1 through MW-3 area Ground water monitoring <br /> data in the area of MW-4 and MW-5 suggest that ground water flow direction was toward the <br /> northwest (Figure 3 -Relatii�e Ground Water Elevations Map) <br /> I <br /> 42 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected ing samples round water les from wells MW-1, MW-2, MW-3, and MW-5 at <br /> concentrations ranging between 77 yg/l and 31,000 ,ug/l <br /> I Benzene was detected inround water samples from wells MW-1 through MW-5 at concentrations <br /> g P g <br /> I ranging between 0 74 and 5,200,ugA The other volatile aromatic compounds (toluene, ethylbenzene <br /> and xylenes)were detected from wells MW-I through MW-5 at concentrations as high as 2,200,ug/l <br /> During this quarterly sampling event, MTBE was not detected in ground water samples collected <br /> from MW-I though MW-5 Analytical results of ground water samples are summarized in Table 2 - <br /> Analytical Results of Ground Water Samples The laboratory report (CAL Laboratory No 1023) and <br />' chain-of-custody are included in Appendix B <br />' 50. CONCLUSIONS/SUMMARY <br /> • Locally, ground water monitoring data in the area of MW-1 through MW-3 suggested that <br />' ground water flow direction was toward the north, northeast and northwest Furthermore, in <br /> the area of MW-1 through MW-3, ground water elevation contours appear to have a domed <br /> configuration <br />' a Ground water monitoring data in the area of MW-4 and MW-5 suggest that ground water <br /> flow direction was toward the northwest <br />' 9 Concentrations of benzene detected in MW-I through MW-4 exceeded the State of California <br /> Maximum Contaminant Levels (MCLs) for drinking water of I 0µg/l <br />' • Concentrations of toluene detected in MW-I and MW-3 exceeded the State of California <br /> MCLs for drinking water of 150 ugA <br />' • Concentrations of ethylbenzene detected in MW-I exceeded the State of California MCLs for <br /> drinking water of 700 pg/l <br /> • Concentrations of xylenes detected in MW-3 exceeded the State of California MCLs for <br /> 1 <br />