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Table 2 <br /> Historical Groundwater Monitoring and Analytical Data r <br /> 7 Eleven Store#32262 <br /> 2360 West Grant Line Road <br /> Tracy,CA <br /> Well ID/ Ethyl- 1,2- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg MtBE TBA DIPS ETBE TAME DCA EDB Notes Oxygen DTW SPT WTE <br /> (TOC) 641/0 UMIL) (pg1L) (pa/LGdl UM/L) (ug/L) (ugIL1 mg/L) (feet) (feet) feet) <br /> Grab Water Samples <br /> W1 05/03/02 <500 <500 <500 <500 <50,000 510,000 79,000 <500 <500 1,500 - - <br /> W2 05/03/02 <250 <250 <250 <250 <25,000 110,000 23,000 <250 <250 350 _ <br /> W3 06/02/03 <50 <50 <50 <50 <5,000 26,000 6,600 <50 <50 71 <br /> TP-1 02/04/04 <0 50 <0 50 <0 50 <050 <50 31 <5 0 <0 50 <0 50 <0 50 <br /> Monrtonng Wells <br /> MW-1 10/30/03 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 D <0 50 <0 50 <0 50 <0 50 7-50 1 5 924 000 1653 <br /> 2577 <br /> MW-2 25 32 10/30/03 <2 5 <2 5 <2 5 <2 5 <250 1,700 <25 <2 5 <2 5 26 <2 5 <2 5 a 08 9 29 000 16 03 <br />� <br /> MW-3 10/30/03 <0 50 <0 50 <0 50 <0 50 <50 95 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 1 3 902 000 1607 <br /> 2509 <br /> MW-4 10/30/03 <0 50 <0 50 <0 50 <0 50 <50 1 9 <50 <0 50 <0 50 <0 50 <0 50 <0 50 1 8 799 000 1,578 <br /> 237 <br /> MW-5 10/30/03 <200 <200 <200 <200 <20,000 120,000 15,000 <200 <200 210 <200 <200 1 5 833 000 1555 <br /> 2388 <br /> MW-6D 10/30/03 <0 50 <0 50 <0 50 <0 50 <50 270 <50 <0 50 <0 50 <0 50 <0 50 <0 50 08 685 000 1801 <br /> 24 86 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons as gasoline 1 2 DCA=1,2 Dichloroethane TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl tert butyl ether EDB=1,2 Dibromoethane ug/L=micrograms per liter <br /> TBA=Tert butanol TOE=Trichloroethene mg/L=milligrams per liter <br /> DIPE=Dusopropyl ether DTW=Depth to water It=feet <br /> EtBE=Ethyl cert butyl ether SPT=Separate phase hydrocarbon thickness - =Not sampled/not measured <br /> TAME=Tert amyl methyl ether WTE=Water table elevation <br /> Notes <br /> All samples analyzed using EPA Method 8260B <br /> a=Matrix Spike/Matrix Spike Duplicate Results for the analyte MtBE were affected by the analyte concentrations already present in the un spiked sample <br /> 117 Elevenl7 11 Stores1322621Tables132262 03-4Q xlsHistoncal Water Page 1 of 1 <br />