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Table 1 <br /> Historical Groundwater Monitoring and Analytical Data <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 DIPE ETBE TAME DCA ED8 Notes Oxygen DTW SPT WTE <br /> (TOC) ( ) (pg1L) (pgfL) (pg L) f iglL) (WA) I (pgfL) (pg/L} I (pg)L) (pglLL) (mglL) (feet) (feet) (feet) <br /> MW-9 <br /> 2523 07130/04 <0 90 <0 90 <0 90 <0 90 <90 420 <5 0 <0 90 <0 90 <0 90 <0 90 <0 90 06 1031 000 1492 <br /> 10/28/04 <1 5 <1 5 <1 5 <1 5 <150 590 <7 0 <1 5 <1 5 <1 5 <1 5 <1 5 07 994 000 1529 <br /> 01/24/05 <0 50 <0 50 <0 50 <0 50 <50 300 <5 0 <0 50 <0 50 070 <0 50 <0 50 03 1034 000 1489 <br /> 05/09/05 <0 50 <0 50 <0 50 <0 50 <50 380 <5 0 <0 50 <0 50 067 <0 50 <0 50 14 1019 000 1504 <br /> 07/26/05 <0 50 <0 50 <0 50 <0 50 <50 130 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 16 1045 000 1478 <br /> EX-1 <br /> 2386 08/12/04 <20 <20 <20 <20 <2,000 7,400 <200 <20 <20 22 -- — -- -- -- -- <br /> 08/13/04 <10 <10 <10 <10 <1,000 5,400 <100 <10 <10 10 -- — -- -- -- -- <br /> 09112/05 <0 90 <0 90 <0 90 <0 90 <90 360 <5 0 <0 90 <0 90 <0 90 -- — -_ 775 <br /> 09/16/05 <2 0 <2 0 <2 0 <2 0 510 11100 <9 0 <2 0 <2 0 <2 0 — -- c -- -- -- — <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 pglL=micrograms per liter <br /> TBA=Tert-butanol DTW=Depth to water mglL=milligrams per liter <br /> DIPE=Dusopropyl ether SPF=Separate-phase hydrocarbon thickness —=Not sampled/not measured <br /> ELBE=Ethyl-tent-butyl ether WTE=Water table elevation <br /> TAME=Tert-amyl-methyl ether <br /> Notes <br /> Samples analyzed using EPA Method 62608 <br /> a=Matrix SpikelMatnx Spike Duplicate Results for the analyte MtSE were affected by the analyte concentrations already present in the un spiked sample <br /> b=TBA results maybe biased slightly high A fraction of MtBE(typically less than 1%)converts to TBA during the analysis of water samples Kiff considers this conversion <br /> effect to be mathematically significant in samples that contain MtBEITBA in rations of over 201 <br /> c=Hydrocarbons reported as TPHg do not exhibit a typical gasoline chromatographic pattern <br /> d=Matrix SpikeNatnx Spike Duplicate Results for the analyte Benzene were affected by the analyte concentrations already present in the un-spiked sample <br /> I <br /> I V-Elevenl7 11 Stores1322621Tables132262 Current Groundwater AsHistoncal Water Page 4 of 4 <br />