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TabIP2 Historical Groundwater Monitoring and Analytical Data 7-Eleven Store#20632 4627 Da Vinci Drive Stockton CA jela'IDl Hyl- MtBE �`tion ©ate Benzene Toluene Benzene Xylene PHg 8 Q M aas_ m : Oft TOC f+ie�l (N9/L) lWaL# iv tual lPu , . MW-6 04/10/02 <0 5 <0 5 <0 5 <0 5 <50 <5 1 1 <5 <05 <0 5 <0 5 60 670 000 -- 238 07/10/02 <0 5 <0 5 <0 5 <0 5 <50 <5 13 <5 <0 5 <0 5 <0 5 14 712 000 -474 10/16/02 <0 5 <0 5 <0 5 <0 5 <50 <5 14 <5 <0 5 <0 5 <0 5 10 740 000 -502 03/26/03 <0 50 091 <0 50 084 <50 -- 23 <50 <0 50 <0 50 <0 50 1 3 656 000 -418 05/20/03 <0 50 <0 50 <0 50 <0 50 <50 -- 14 <5 0 <0 50 <0 50 <0 50 d 06 677 000 -439 08/01/03 <0 50 <0 50 <0 50 <0 50 <50 -- 1 1 <5 0 <0 50 <0 50 <0 50 02 741 000 -503 10/23/03 <0 50 <0 50 <0 50 <0 50 <50 -- 14 <5 0 <0 50 <0 50 <0 50 14 676 000 -438 01/12/04 <0 50 <0 50 <0 50 <0 50 <50 33 66 <0 50 <0 50 <0 50 07 558 000 -320 04127104 <0 50 <0 50 <0 50 <0 50 <50 -- 23 <5 0 <0 50 <0 50 <0 50 1 1 676 000 -438 MW-7 04/10/02 <5 77 <5 52 <500 13,000 22,000 <5,000 <500 <500 <500 57 720 000 -- 273 07/10/02 <10 <10 <10 <10 <1,200 21,000 30,000 <10,000 <1,000 <1,000 <1,000 1 3 765 000 -492 10/16/02 <12 <12 <12 <12 <1,200 32,000 31,000 <5,000 <500 <500 <500 12 795 000 -522 03/26/03 <100 <100 <100 <100 <10,000 -- 56,000 28,000 <100 <100 <100 07 714 000 -441 05/20/03 <200 <200 <200 <200 <20,000 54,000 44,000 <200 <200 <200 04 733 000 -460 08/01/03 <100 <100 <100 <100 <10,000 -- 47,000 38,000 <100 <100 <100 01 794 000 -521 10/23/03 <100 <100 <100 <100 <10,000 -- 44,000 55,000 <100 <100 <100 14 723 000 -450 01/12/04 <50 <50 <50 <50 <5,000 -- 25,000 56,000 <50 <50 <50 03 613 000 -340 04/27/04 <50 <50 <50 <50 <5,000 -- 19,000 62,000 <50 <50 <50 1 1 731 000 -458 Explanation TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert-amyl-methyl ether pg1L=micrograms per liter MtBE=Methyl-tert-butyl ether DTW=Depth to water mg/L=m,illigrams per liter TBA=Teri-butanol SPT=Separate-phase hydrocarbon thickness -=Not sampled/not measured DIPS=Dnsopropyl ether WTE=Water table elevation EtBE=Ethyl-tert-butyl ether TOC=Top of casing elevation in feet above mean sea level Notes Historical data prior to 03/26/03 sample date provided by Shaw E&I Samples analyzed using EPA Method 8260E starting with 03/26/03 sample date a=Method Blank Contamination Method blank contains target analyte at a reportable level b=Estimated Benzene result Result concentration exceeds the calibration range c=Elevated reporting limit for MOE TBA DIPS,ELBE The reporting limit is elevated due to matrix interference Id=Matrix Spike/Matrix Spike Duplicate Results for MtBE were affected by the analyte concentration already present in the un-spiked sample 117-Eleven`17-11 Stores1206321Tables120632 04-20 AsHistoncal Water Page 6 of 6