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Table A Groundwater Monitoring Analytical Results Third Quarter 1999 1 Ethyl- Total TPHg Benzene Toluene MTBE TBA 1,2-DCA WellI.D (per) (ug/L) (A�) benzene xylenes Domestic <50 <0 3 <0 3 <0 3 0.92 <0 50 <5 0 <0 50 Well MW-1 1,200 30 60 053 3.5 6.6 56 45 MW-2 39,000 8,100 11,000 730 3,800 18 39 X20 MW-3 <10 2.7 2 7 0.65 3 0 <0 50 20 1 8 MW4 1,200 57 3 0 0 63 20 <0 50 6.0 1.3 Notes < Not detected above laboratory's indicated reportable detection hunt DIPS,ETBE, and TAME were not detected m the five samples Refer to laboratory report for detection Imuts 8.0 DISCUSSION Total xylenes were detected in the domestic well sample at a concentration of 0 92 µg/]L The concentration yielded from the well is significantly less than the California Department of Health Services primary maximum contaminant level (MCL) of 1,750 µg/L and the taste and odor threshold of 17 gg/L (RWQCB, 1998) At the detected concentration, water from the domestic supply well currently does not pose a health or taste and odor threat according to regulatory standards BSK will continue to sample the domestic well on a quarterly basis If an increasing trend in hydrocarbon impact is identified, BSK will work with the County and responsible party to develop and unplement an appropriate mitigation measure 9.0 LIMITATIONS This report was prepared in accordance with generally accepted standards of environmental practice in California at the time groundwater monitoring was performed Our services were ' conducted solely for the purpose of evaluating the general condition of groundwater beneath the subject site with regards to possible petroleum-hydrocarbon contamination Environmental I conditions of groundwater, with respect to petroleum hydrocarbons, is based on limited data available through existing groundwater-monitoring wells No other opinion as to groundwater conditions or quality is stated or should be inferred Statue Report 07400178 Third Quertc 1999 4 r �