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Table A Groundwater Monitoring Analytical Results First Quarter 2000 TPHg Benzene Toluene Ethyl- TotalMTBE TBA 1,2-DCA Well I D. (A ms) (µms) (µms) benzene Xylenes (µms) (µms) (A ms) (Ag/L) (!sem) Domestic <50 <0 3 0.91 <0 3 <0 3 <5 0 <50 <5 0 Well MW-1 1,900 130 6.1 <0 3 4.5 <5 0 <50 39 MW-2 59,000 7,700 6,900 970 5,200 <50 <500 <50 MW-3 <50 0.70 <0 3 <0 3 <0 3 <5 0 <50 <5 0 MW4 350 5.9 0.44 <0 3 3.9 <5 0 <50 <5 0 MCL's 5 1 42 29 17 NA NA NA Notes < Not detected above laboratory's indicated reportable detection lmmrt RIPE,ETBE, and TAME were not detected in the five samples Refer to laboratory report for detection limits MCL's Maximum Contaminant Levels(US EPA Federal Register of 1989,for taste and odor thresholds) NA Not Applicable 8.0 DISCUSSION Total xylenes were not detected in the domestic well sample above the laboratory detection Inert of concentration of 0 50µg2 Water from the domestic supply well currently does not pose a health and taste and odor concern as regulatory guidelines have not been exceeded The domestic well should be continued to be sampled on a quarterly basis If an increasing trend in hydrocarbon impact is identified, an appropriate plan for mitigation should be prepared 9.0 1,13IITATIONS 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 contammatmon 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,rI Compilation of Water Quality Goals,California Environmental Protection Agency,Regional ' Water Quality Control Board, Central Valley Region,March, 1998 ,1 Status Repo"_07400178 Fust Qumte 2000 4