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Tal <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#20632 <br /> 4627 Da Vinci Drive <br /> Stockton,CA <br /> Well 101 ,y�.v <br /> Ele�ti d teM a- Senzen a oluen e1nzle P r <br /> (TOCY- `��a m � (pg ) 9t Tdf�gtG}* <br /> MW4 <50 <5 1 1 <5 <0 5 <0 5 <0 5 6 0 6 70 0 00 <br /> 04110!02 <0 5 <0 5 <0 5 <0 5 -- <br /> 238 07110/02 <0 5 <0 5 <0 5 <0 5 <50 <5 13 <5 <0 5 <0 5 <0 5 14 712 000 -4 74 <br /> 10/16/02 <0 5 <0 5 <br /> <0 5 <0 5 <50 <5 14 <5 <0 5 <0 5 <0 5 1 0 740 000 -502 <br /> 03/26/03 <0 50 091 <0 50 0841 <50 -- 23 <5 0 <0 50 <0 50 <0 50 13 656 000 -418 <br /> 05120/03 <br /> <0 50 <0 50 <0 50 <0 50 <50 - 14 <50 <0 50 <0 50 <0 50 d 06 677 000 -439 <br /> Mw-7 <br /> 04110/02 <5 77 <5 52 <500 13,000 22,000 <5,000 <500 <500 <500 57 720 000 -- <br /> 273 07/10/02 <10 <10 <10 <10 <1,200 21,000 30,000 <10,000 <1,000 <1,000 <1,000 13 765 000 -492 <br /> 10/16/02 <12 <12 <12 <12 <1,200 32,000 31,000 <5,000 <500 <500 <500 1 2 795 000 -522 <br /> 03/26/03 <100 <100 <100 <100 <10,000 -- 56,000 28,000 <100 <100 <100 07 714 000 -441 <br /> 05/20/03 <200 <200 <200 <200 <20,000 — 54,000 44,000 <200 <200 <200 04 733 000 460 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert-amyl-methyl ether pg1L=micrograms per liter <br /> MtBE=Methyl-tent-butyl ether DTW=Depth to water mg1L=milligrams per liter <br /> TBA=Tart butanol SPT=Separate-phase hydrocarbon thickness It=feet <br /> DIPE=Dusopropyl ether WTE=Water table elevation =Not sampledlnot measured <br /> ELBE=Ethyl-tert butyl ether TOC=Top of casing elevation in feet above mean sea level <br /> Notes <br /> Historical data prior to 03126!03 sample date provided by Shaw E&I <br /> All samples analyzed using EPA Method 8260E starting with 03/26/03 sample date <br /> a=Method Blank Contamination Method blank contains target analyte ata reportable level <br /> b=Esbmated Benzene result Result concentration exceeds the calibration range <br /> c=Elevated reporting limit for MtBE TBA DIPE EtBE The reporting limit is elevated due to matrix interference <br /> d=Matrix SpikelMatrix Spike Duplicate Results for MtBE were affected by the analyte concentration already present in the un-spiked sample <br /> I <br /> 117-Elevenl7-11 Stores1206321Tables120632 03-2Q xlsHistorical Water Page 5 of 5 <br />