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Qulk Stop No 121 22-Oct-01 CCI Project No 12118-6 TABLE 2(cont SUMMARY OF MONITORING WELL.GROUNDWATER SAMPLE ANALYSIS Quik Stop No 121 1196 West Louise Avenue Manteca,CA Ethyl Total Well Date TPHg Benzene Toluene Benzene Xylenes MTBE Number Sampled (ugll) (ug/1) (ug/1) (ug/1) (ug/1) (ug11) MW-4 111012001 1,400 <10 <10 <10 <10 3,500 4118/2001 86 <0 5 <0 5 <0 5 <1 1,200 7/1712001 760 <0 5 1 <0 5 <0 5 <0 5 70,000 1014/2001 <100,004 1 <2 000 1 <2 000 <2 000 <2 000 38,000 MW-5 1/10/2001 <50 <0 5 <0 5 <0 5 <0 5 92 4/18/2001 54 09 <05 <0 5 <1 310 7117/2001 80 <0 5 <0 5 <0 5 <0 5 120 101412001 320 <1 <1 <1 <1 100 MW-6 111012001 <50 <0 5 <0 5 <0 5 <05 <5 4/1812001 78 1 3 07 3 29 150 <0 5 <0 5 <0 5 <05 30 7!1712001 101412001 150 <0 5 <0 5 <05 <0 5 21 i MW-7 111012001 <50 <0 5 <05 <0 5 <0 5 64 4118120011 75 <0 5 <0 5 <0 5 <1 2 7117/2001 <50 <0 5 <0 5 <0 5 <0 5 <5 101412001 <50 <0 5 <0 5 <0 5 <05 <0 5 MW-8 1 4/1812001 <50 <0 5 <0 5 05 2 08 7/1712001 Well Dry- No Sample Collected 101412001 Well Dry- No Sam le Collected RW-1 1110120011 <100 <100 <100 <100 84,000 4/18/2001 520 6 <0 5 <0 5 <1 180,000 7/1712001 5,300 F 17 <5 <5 <5 120,000 101412001 <50 000 <1 000 11,000 <1 000 <1 000 100,000 MW-9 811712001 <50 <05 <0 5 <0 5 <0 5 <5 1 OW20011 <50 <1 <1 <1 <1 <0 5 MW 10 8/17/2001 <50 <0 5 <0 5 <0 5 <0 5 <5 101412001 150 <1 <1 <1 <1 <0 5 MW-11 8/1712001 <50 <0 5 <05 <0 5 <0 5 <5 101412001, <50 <1 <1 <1 <1 <0 5 i TPHg Total Petroleum Hydrocarbons as Gasoline Current Central Valley RWQCB Water Quality Goals ugA Micrograms per Liter < Below laboratory Detection Limit Toluene 42 ppb N R Note Requested Ethyl Benzene 29 ppb MTBE Methyl tertiary butyl ether Xylenes 17 ppb NIA Not Available Benzene 1 ppb TPHg 5 ppb • FCompliance Foot Notes 1 Results within quanbtabon range chromatographic pattern not typical of fuel Note Subject to change as reviewed by the Department of S Heath Services Closure. Inc.