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� Former Discovery Chevrolet <br /> t" ifi March 22 1996 <br /> Cl-HCs were not detected in the groundwater sample from well MW-3, but this sample did <br /> contain TPHd at a concentration of 60 ppb. TPHg and BTEX were not detected in the trip <br /> blank. These data have been used to construct a TPHg/Benzene/TPHd Concentration Map <br /> (Figure 4). <br /> Disposition of Well Purge Water <br /> Approximately 75 gallons of water generated during the second, third, and fourth quarters <br /> of 1995 were removed from the site on February 12, 1996. The water was removed by <br /> Evergreen Environmental Services and taken to their facility in Newark, California, for <br /> disposal. A copy of the disposal manifest is attached in Appendix B. Purge water generated <br /> during the first quarter 1996 sampling of groundwater monitoring wells MW-1 through <br /> MW-3 was discharged to properly labelled drums and stored at the site pending disposal. e <br /> DISCUSSION AND CONCLUSIONS i <br /> During the first quarter 1996 groundwater was measured 0.31 to 0.61 feet above levels <br /> measured during the fourth quarter 1995. Groundwater levels measured during the first <br /> quarter 1996 are the highest levels recorded to date. During the fust quarter 1996 ` <br /> groundwater appeared to flow toward the northwest under a gradient of 0.02. These data <br /> sr} <br /> ._: ., appear generally consistent with_historical monitoring data. j <br /> TPHg and benzene were detected upgradient (well MW-1) and downgradient (well MW-2) <br /> of the former gasoline USTs. TPHd were detected downgradient of the former waste oil <br /> UST (well MW-3). From fourth quarter 1995 to first quarter 1996 hydrocarbon <br /> concentrations decreased in both wells MW-1 and MW-2. <br /> TPHg, BTEX, or Cl-HCs have never been detected in groundwater samples from well <br /> MW-3. Clearly the groundwater downgradient of the former waste oil UST in the vicinity <br /> of well MW-3 has not been impacted by these hydrocarbons. TPHd has been detected in the <br /> groundwater samples from well MW-3 only during two of the six quarterly sampling events <br /> at concentrations of 60 and 200 ppb. <br /> NEXT QUARTER'S PLANNED ACTIVITIES <br /> F <br /> Activities planned for the second quarter 1996 at the subject site include: <br /> R <br /> Monitoring, purging, and sampling all on-site groundwater monitoring wells. <br /> Groundwater samples from wells MW-1 and MW-2 will be analyzed for TPHg and <br /> BTEX. The groundwater sample from well MW-3 will be analyzed for TPHg, BTEX, k <br /> TPHd and Cl-HCs. <br /> 8146,03-1 4 <br /> I <br /> €1 <br /> 44 <br /> E <br />