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Table A ' Groundwater Monitoring Analytical Results Fourth Quarter 1999 ' TPHg Benzene Toluene Ethyl- Total MTBE TBA 1,2-DCA well I.D. (pgtL) (Ag/L) (Pg/L) benzene Xylenes (Pg/L) (AWL) (AWL) (llg/L) (ug/]L) Domestic <50 <0 50 <0 50 <0 50 <0 50 <5 0 <20 <5 0 Well t] 680 170 29 5.5 28 <250 <1,000 <250 ' MW-2 89,000 13,000 13,000 300 7,900 <5 0 <20 61 MW-3 670 45 44 81 47 <5 0 <20 <5 0 MW4 66 19 3.9 090 50 <5 0 <20 <5 0 Notes < Not detected above laboratory's indicated reportable detection lmut DIPE,ETBE,and TAME were not detected in the five samples Refer to laboratory report for detection Imuts 8.0 DISCUSSION Total xylenes were not detected in the domestic well sample above the laboratory detection limit of concentration of 0 50 gg/L 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 implement an appropriate ' mitigation measure 9.0 LIMITATIONS This report was prepared in accordance with generally accepted standards of environmental 1 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 ' 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 10.0 REFERENCES RWQCB, 1998,A Compilation of Water Quality Goals, California Environmental Protection 1 Agency, Regional Water Quality Control Board, Central Valley Region, March, 1998 S—Rte, 074W179_ern Q--1-1 1M 4