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Ta 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#20632 <br /> 4627 Da Vinci Drive <br /> Stockton CA <br /> MW-7 <br /> 04/10/02 <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 /> 10116102 <12 <12 <12 <12 <1,200 32,000 31,000 <5,000 <500 <500 <500 12 795 000 -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 /> 08/01/03 <100 <100 <100 <100 <10,000 -- 47,000 38,000 <100 <100 <100 01 794 000 -521 <br /> 10/23/03 <100 <100 <100 <100 <10,000 -- 44,000 55,000 <100 <100 <100 14 723 000 -450 <br /> 01/12/04 <50 <50 <50 <50 <5,000 25,000 56,000 <50 <50 <50 03 613 000 -340 <br /> 04/27/04 <50 <50 <50 <50 <5,000 -- 19,000 62,000 <50 <50 <50 1 1 731 000 -458 <br /> 07/08/04 <0 50 <0 50 <0 50 <0 50 200 -- 17,000 55,000 <0 50 <0 50 19 09 761 000 -488 <br /> 10/08/04 <25 <25 <25 <25 <2,500 -- 43,000 68,000 <25 <25 <25 04 774 000 -501 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tort-amyl-methyl ether pgA-=micrograms per liter <br /> MtBE=Methyl-tent-butyl ether DTW=Depth to water mg/L=milligrams per liter <br /> TBA=Tert-butanol SPT=Separate-phase hydrocarbon thickness -=Not sampled/not measured <br /> DIPS=Ditsopropyl ether WTE=Water table elevation <br /> EtBE=Ethyt-tert-butyl ether TOC=Tog of casing elevation in feet above mean sea level <br /> Notes <br /> Historical data prior to 03/26/03 sample date provided by Shaw E&I <br /> Samples analyzed by EPA Method 8260B starting with 03/26/03 sample date <br /> a=Method Blank Contamination Method blank contains target analyte at a reportable level <br /> b=Estimated Benzene result Result concentration exceeds the calibration range <br /> c=Elevated reporting limit for MTBE,TBA,DIPE ELBE The reporting limit is elevated due to matrix interference <br /> d=Matrix Spike/Matnx Spike Duplicate Results for MtBE were affected by the analyte concentration already present in the un-spiked sample <br /> e=Analysis for TPHg was affected by short-term instrument contamination problem Normally,the sample would be re-analyzed,but the problem was not identified until after the hold time <br /> bme had expired It is likely that the actual concentration of TPHg is X50 pglL <br /> I <br /> 117-Elevenl7-11 Stores1206321Tables120632 Current Groundwater AsHistoncal Water Page 6 of 6 <br />