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Table 1 Historical Groundwater Monitoring and Analytical Data 7-Eleven Store#32262 2360 West Grant Line Road Tracy,CA Well ID! Ethyl- 1,2- Dissolved Elevation Date Benzene Toluene Benzene Xylene TPHg MtBE TBA DIPE ETBE TAME DCA EDB Notes Oxygen DTWSPT WTE (TOC) ( ) (P IL) 1 /L) (p /L) (Pg/L) (P /L) (p IL) (pg/L) WIL) ( /L) (P fL1 IPg/L) (m9/L) (feet) (feet) (feet) MW-6D 24.86 10/30/03 <0.50 <0.50 <0.50 <0.50 <50 270 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 0.8 6.85 0.00 18.01 01/14/04 <0.50 <0.50 <0.50 <0.50 <50 110 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 5.8 6.44 0.00 18.42 04/26/04 <0.50 <0.50 <0.50 <0.50 <50 25 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 7.9 6.72 0.00 18.14 07/30/04 <0.50 <0.50 <0.50 <0.50 <50 6.4 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 a 6.1 6.65 0.00 18.21 10/28/04 <0.50 <0.50 <0.50 <0.50 <50 5.0 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 6.5 6.14 0.00 18.72 01/24/05 <0.50 0.75 <0.50 0.55 <50 2.7 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 7.3 6.24 0.00 18.62 MW-7 24.97 07/30/04 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 0.3 8.72 0.00 16.25 10/28/04 <0.50 <0.50 <0.50 <0.50 <50 1.5 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 0.3 8.43 0.00 16.54 01/24/05 <0.50 <0.50 <0.50 <0.50 <50 8.7 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 0.3 8.77 0.00 16.20 MW-8 25.33 07/30/04 <0.50 <0.50 <0.50 <0.50 <50 210 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 0.9 11.18 0.00 14.15 10/28/04 <0.50 <0.50 <0.50 <0.50 <50 120 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 0.5 10.87 0.00 14.46 01/24/05 <0.50 0.71 <0.50 <0.50 <50 42 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 0.6 11.12 0.00 14.21 MW-9 25.23 07/30/04 <0.90 <0.90 <0.90 <0.90 <90 420 <5.0 <0.90 <0.90 <0.90 <0.90 <0.90 0.6 10.31 0.00 14.92 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 0.7 9.94 0.00 15.29 01/24/05 <0.50 <0.50 <0.50 <0.50 <50 300 <5.0 <0.50 <0.50 0.70 <0.50 <0.50 0.3 10.34 0.00 14.89 EX-1 08/12/04 <20 <20 <20 <20 <2,000 7,400 <200 <20 <20 22 - - 23.86 08/13/04 <10 <10 <10 <10 <1,000 5,400 <100 <10 <10 10 - - - - - -- Explanation TPHg=Total petroleum hydrocarbons-as-gasoline 1,2-DCA=1,2-Dichloroethane TOC=Top of casing elevation in feet above mean sea level MtBE=Methyl-tert-butyl ether EDB=1,2-Dibromoethane pg/L=micrograms per liter TBA=Tert-butanol DTW=Depth to water mg/L=milligrams per liter DIPS=Diisopropyl ether SPT=Separate-phase hydrocarbon thickness =Not sampled/not measured EtBE=Ethyl-tert-butyl ether WTE=Water table elevation TAME=Tert-amyl-methyl ether Notes Samples analyzed using EPA Method 82608. a=Matrix Spike/Matrix Spike Duplicate Results for the analyte MtBE were affected by the analyte concentrations already present in the un-spiked sample. b=TBA results may be biased slightly high. A fraction of MtBE(typically less than 1%)converts to TBA during the analysis of water samples. Kiff considers this conversion effect to be mathematically significant in samples that contain MtBEITBA in rations of over 20.1. c Page 3 of 3