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�.. N.1 <br /> TABLE 1 <br /> Concentrations of Selected Constituents in Groundwater in Wells South of Site <br /> Del Monte Foods Disco Site <br /> Stockton,California <br /> Concentration(ug/L) <br /> Monitoring Well# Sample Date TPH-g 1,2 DCA Benzene Toluene Ethyl- Xylene <br /> benzene <br /> MCL NA 0.5 1 150 300 1,750 <br /> RWQCB ESL Nola 1 100Notez 200 540 380,000 170,000 160,000 <br /> MW-DIS-15 3/4/2003 ND 10 ND ND ND ND <br /> 5/19/2003 ND 8.2 ND ND ND ND <br /> 7/29/2003 ND 10 ND ND ND ND <br /> 11/11/2003 ND " 8.4 ND ND ND ND <br /> 2/18/2004 ND 5.8 ND ND ND ND <br /> 6/2/2004 ND 7.8 - ND ND ND ND <br /> 9/13/2004 ND 2.1 ND ND ND ND <br /> 12/20/2004 ND 1.9 ND ND ND ND <br /> 3/21/2005 ND<50 1.7 ND<0.5 ND <0.5 ND<0.5 ND<0.5 <br /> 6/20/2005 ND<50 .0.97 ND<50 ND<50 ND<50 ND<50 <br /> 8/29/2005 ND<50 1.0 ND<50 ND<50 ND<50 ND<50 <br /> 12/9/2005 ND<50 1-.0 - ND<50 ND<50 ND<50 ND<50 <br /> 2/22/2006 ND<50 1.2 ND<0.5 I ND<0.5 ND<0.5 ND<0.5 <br /> 5/30/2006 ND<50 0.96. ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> 8/22/2006 ND<50 ND<1 ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> 11/29/2006 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> 3/6/2007 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> 6/14/2007 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> 9/18/2007 <50 ND<0.5 <0.5 <0.5 <0.5 <0.5 <br /> 12/11/2007 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> 3/12/2008 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> 6/3/2008 ND<50 ND<0.5 I ND<0.5 I ND<0.5 I ND<0.5 ND<0:5 <br /> NA-=Not Available <br /> NO1e t ESLs are RWQCB Environmental Screening Levels(ESLs)based on vapor intrustion into buildings. <br /> Note 2A vapor intrusion ESL is not available for TPH. Value shown is the SFRWQCB ESL based on drinking <br /> water toxicity and taste and odor threshold. <br /> Shaded values exceed MCLs. <br /> Page 4 of 4 The Source Group,Inc. <br />