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Table 1 <br /> Comparison of Monitoring Well Sampling Results with Screening Levels <br /> Fonner Heintz Facility <br /> Tracy, California <br /> Sample Total <br /> Location Date TPH-G TPH-D Benzene Toluene Ethylbenzene Xylenes MTBE <br /> Site-specific <br /> GW RBSL NA NA 5,500 17,000,000 54,000,000 39,000,000 NA <br /> GW ESL for <br /> VI-CDM NA NA 1,800 530,000 I70,000 160,000 80,000 <br /> GW ESL for <br /> VI-RES NA NA 540 380,000 170,000 160,000 24,000 <br /> Tank 1 Area <br /> MW-1 11/05/09 452 NA 5.9 2.6 18 12.7 NA <br /> MW-3 09/29/04 <50 NA <0.5 <0.5 <0.5 <1.0 NA <br /> MW-4 11/05/09 20,000 NA <13 135 1,030 2,160 NA <br /> MW-7 09/29/04 <50 NA <0.5 <0.5 <0.5 <1.0 NA <br /> Tank 2 Area <br /> MW-2 11/05/09 <50 NA <0.5 <0.5 <0.5 <1 NA <br /> MW-5 09/29/04 <50 NA <0.5 <0.5 <0.5 <1.0 NA <br /> MW-6 11/05/09 3,290 NA 95 13.6 64.4 74.1 NA <br /> MW-6 Dup 11/05/09 3,020 NA 93 13.8 66.4 74.9 NA <br /> MW-8 09/29/04 <50 NA <0.5 <0.5 <0.5 <1.0 NA <br /> Notes: <br /> All sample.results are given in micrograms per liter (µg/L). <br /> TPH-D=total petroleum hydrocarbons as diesel <br /> TPH-G= total petroleum hydrocarbons as gasoline <br /> MTBE= methyl tertiary butyl ether <br /> GW RBSL=groundwater risk based screening level (ERM,April 2000) <br /> GW ESL for VI-RES=Groundwater Environmental Screening Level for Evaluation <br /> of Potentail Vapor Intrusion Concerns -Residential Land Use(RWQCB,2007) <br /> GW ESL for VI-COM =groundwater Environmental Screening Level for Evaluation <br /> of Potentail Vapor Intrusion Concerns -Commercial/Industrial Land Use(RWQCB,2007) <br /> NA=not analyzed, not available <br /> Dup=duplicate sample analysis <br /> ERM Page 1 of 1 HEINZ TRACY/0106834-3/24/2010 <br />