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Table 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Ston:#14117 <br /> 2725 Country Club Boulevard <br /> Stockton CA <br /> Well IDI Ethyl- MtBE 1,2- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME DCA EDB Notes Oxygen DTW SPT WTE <br /> TOC IL IL IL 1L /L IL IL IL IL !L IL 1L !L m IL feet feet feet <br /> MW-5 <br /> 153 11/05/01 <0 5 <0 5 <0 5 <0 5 <50 -- <5 <20 <5 <5 <5 <5 <5 09 973 000 -820 <br /> 126 01/08/02 <5 <5 <5 <5 <50 - <10 23 <5 <5 <5 -- -- 08 660 000 -534 <br /> 04/12/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 -- -- 08 722 000 -596 <br /> 07/09/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 - - 08 740 000 -614 <br /> 10/16/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 -- 09 900 000 -774 <br /> 03/17/03 <0 50 <0 50 97 <0 50 470 <0 50 <5 0 <0 50 <0 50 <0 50 -- — 14 724 000 -598 <br /> MW-6 <br /> 1 26 11/05/01 <0 5 28 <0 5 099 <50 -- <5 <20 <5 <5 <5 <5 <5 1 0 944 000 -818 <br /> 119 01/08/02 <5 <5 <5 <5 <50 <10 <20 <5 <5 <5 -- - 10 754 000 -635 <br /> 04/12/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 -- -- 12 726 000 -607 <br /> 07/09/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 -- -- 10 535 000 416 <br /> 10!16102 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 — 10 900 000 -781 <br /> 03/17/03 <0 50 <0 50 <0 50 <0 50 <50 — <0 50 <5 0 <0 50 <0 50 <0 50 -- 14 791 000 -672 <br /> MW-7 <br /> I <br /> 1 19 11/05/01 <0 5 <0 5 <0 5 <0 5 <50 -- <5 <20 <5 <5 <5 <5 <5 1 0 1020 000 -901 <br /> 153 01/08/02 -- -- — -- -- -- _ __ _ — _ __ 09 — 000 -- <br /> 04/12/02 <0 5 <0 5 <0 5 <0 5 <50 <5 24 <5 <0 5 <0 5 <0 5 -- 1 0 747 000 -594 <br /> 07/09/02 <0 5 <0 5 <0 5 <0 5 <50 <5 24 <5 <0 5 <0 5 <0 5 -- -- 1 1 790 000 -637 <br /> 10/16/02 <0 5 <0 5 <0 5 <0 5 <50 <5 052 15 <0 5 <0 5 <0 5 -- -- 1 0 943 000 -790 <br /> 03/17/03 <0 50 <0 50 <0 50 <0 50 110 86 <5 0 <0 50 <0 50 <0 50 -- -- 12 767 000 -614 <br /> I <br /> Explanation <br /> TPHg=Total petroleum hydrocarbonsas-gasoline TAME=Tert-amyl-methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl-tert-butyl ether 1 2-DCA=1 2-dichloroethane pg1L=micrograms per liter <br /> TBA=Tert-Butanol EDB=1,2-dibromoethane mg/L=milligrams per liter <br /> DIPE=Dusopropyl ether DTW=Depth to water ft=feet <br /> EtBE=Ethyl-tent-butyl ether SPT=Separate-phase hydrocarbon thickness —=Not sampledlnot measured <br /> WTE=Water table elevation <br /> Notes <br /> Historical data prior to 03/17/03 sample date provided by Shaw E&I BTEX,TPHg and MIBE analyzed using EPA Method 8020/8015 Modified <br /> All samples analyzed using EPA Method 82608 starting with 03/17/03 sample date <br /> a=Method Blank Contamination The associated method blank contains the target analyte at a reportable level <br /> 14117 03-1 QHistoncal Water Page 3 of 3 <br />