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Tajo . <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7 Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton CA <br /> WeIIID! Ethyl- MtBE 1,2- Meth- Eth- Ace- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 6020 MtBE TBA DIPS EtBE TAME DCA EDS anol anol tone Notes Oxygen DTW SPT WTE <br /> TOC L 1L L 1L) (jigiL) (Mg1L 1L IL 1L iL IL L /L IL 1L ItialL, frnaILIfeet <br /> MW-7 <br /> 1 19 11/05/01 <0 5 <0 5 <0 5 <0 5 <50 <5 <20 <5 <5 <5 <5 <5 -- - 10 1020 000 -901 <br /> 1 53 01/08/02 — — — — - — — — — 09 -- 000 — <br /> 04112/02 <0 5 <0 5 <0 5 <0 5 <50 <5 24 <5 <0 5 <0 5 <0 5 - 10 747 000 -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 /> 10116/02 <0 5 <0 5 <0 5 <0 5 <50 <5 052 15 <0 5 <0 5 <0 5 - — — 10 943 000 -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 /> 05/29/03 <0 50 <0 50 <0 50 <0 50 <50 42 <5 0 <0 50 <0 50 <0 50 - — 14 794 000 -641 <br /> 098 09118/03 <0 50 <0 50 <0 50 <0 50 160 — 36 <5 0 <0 50 <050 <0 50 <0 50 <0 50 <50 <5 0 <5 0 23 954 11011 -856 <br /> 12/02/03 <0 50 <0 50 <0 50 <0 50 <50 17 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 — 01 909 000 -811 <br /> MW-8 <br /> 1 90 09/18/03 25 130 64 340 3,200 22 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 <8 0 c 08 1061 000 -871 <br /> 12/02/03 22 43 4 7 13 320 079 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 — 00 985 000 -795 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-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 pgIL=micrograms per liter <br /> TBA=Tert Butanol EDB=1 2-dibromoethane mgrL=milligrams per liter <br /> DIPE=Diisopropyl ether DTW=Depth to water —=Not sampled/not measured <br /> EtBE=Ethyl tert-butyl ether SPT=Separate phase hydrocarbon thickness EPA=Environmental Protection Agency <br /> W TE=Water table elevabon =Not detected above the laboratory method reporting limit <br /> Notes <br /> Historical data prior to 03!17103 sample date provided by Shaw E&I BTEX TPHg and MtBE analyzed using EPA Method 8020!8015 Moddied <br /> Samples analyzed using EPA Method 8260B starting with 03/17103 sample date <br /> a=Method Blank Contammation The associated method blank contains the target artalyte at a reportable level <br /> b=Matrix SpikelMatnx Spike Duplicate for the analytes Benzene MtBE was affected by the analyte concentrations already present in the un spiked sample <br /> c=The Method Reporting Limit for Acetone has been increased due to the presence of an interfering compound <br /> 147 ElevenV-11 Stores1141171Tables114117 03-4Q AsHistorical Water Page 6 of 6 <br />