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TA <br /> Fourth Quarter 2004 Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#20632 <br /> 4627 Da Vinci Drive <br /> Stockton,CA <br /> MW-1 10/08/04 <0 50 055 <0 50 <0 50 110 16 90 <0 50 <0 50 <0 50 a 01 646 000 -473 <br /> 173 <br /> MW-2 10/08/04 <1 0 <1 0 <1 0 <1 0 <100 490 100 <1 0 <1 0 <1 0 02 782 000 -500 <br /> 282 <br /> MW-3 10/08/04 <0 50 <0 50 18 63 1,500 27 <5 0 <0 50 <0 50 <0 50 d 02 775 000 493 <br /> 2821 <br /> MW-4R 10/08/04 140 <10 60 31 1,200 1,500 14,000 <10 <10 <10 01 727 000 490 <br /> 237 <br /> MW-5 10/08/04 075 <0 50 082 062 78 110 41 066 <0 50 <0 50 d 01 750 000 493 <br /> 257 <br /> MW-6 10/08/04 <0 50 <0 50 <0 50 <0 50 <50 15 <50 <0 50 <0 50 <0 50 d 02 722 000 -484 <br /> 238 <br /> MW-7 10/08/04 <25 <25 <25 <25 <2,500 13,000 68,000 1 <25 <25 <25 04 774 000 -501 <br /> 273 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert-amyl-methyl ether Vg1L W micrograms per liter <br /> MtBE=Methyl-tert-butyl ether DTW=Depth to water mg/L=milligrams per liter <br /> TBA=Tert-butanol SPT=Separate-phase hydrocarbon thickness <br /> DIPE=Dusopropyl ether WTE=Water table elevation <br /> ELBE=Ethyl-tert-butyl ether TOC=Top of casing elevation in feet above mean sea level <br /> Notes <br /> Samples analyzed by EPA Method 8260B <br /> d=Matnx SpikelMatnx 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 /> time had expired It is likely that the actual concentration of TPHg is<50 pg1L <br /> _ Page 1 of 1 <br /> 7 Elevenl7 11 SEore1206321Tables120632 Current Groundwater xis 9 <br />