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Tal <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7 Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton CA <br /> Well lt)1 Ethyl- MtBE 1,2- Meth- Eth Ace- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME DCA EDB anal anol tone Notes Oxygen E3TW SPT WTE <br /> TOC 1L 1L IL L IL IL L 1L L L L 1L 1L 1L m 1L feet feet feet <br /> MW-7 <br /> 1 19 11/05/01 <05 <0 5 <0 5 <0 5 <50 — <5 <20 <5 <5 <5 <5 <5 - — -- 10 1020 000 -901 <br /> 153 01/08/02 — — — — -- — — — -- — — — -- — — - 09 — 000 — <br /> 04/12/02 <0 5 <0 5 <0 5 <05 <50 <5 24 <5 <0 5 <05 <0 5 -- — — - — 10 747 000 -594 <br /> 07/09/02 <0 5 <0 5 <0 5 <0 5 <50 <5 24 <5 <0 5 <05 <0 5 — — — — — 1 1 790 000 -637 <br /> 10/16/02 <0 5 <0 5 <0 5 <0 5 <50 <5 052 15 <05 <0 5 <0 5 — — -- — — 1 0 943 000 -790 <br /> 03/17103 <0 50 <0 50 <0 50 <0 50 110 — 86 <50 <0 50 <0 50 <0 50 -- — - — — 12 767 000 -614 <br /> 05129/03 <0 50 <0 50 <0 50 <0 50 <50 — 42 <50 <0 50 <0 50 <0 50 — — - — - 14 794 000 -641 <br /> 098 09/18/03 <0 50 <0 50 <0 50 <0 50 160 — 36 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 <5 0 23 954 000 -856 <br /> 12/02103 <0 50 <0 50 <0 50 <0 50 <50 — 17 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 — 01 909 000 -811 <br /> 03/03/04 <0 50 <0 50 <0 50 <0 50 <50 — 054 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — — — d 02 668 000 -570 <br /> 06/09104 - -- -- - -- -- - - - -- - - -- - - -- - -- - - <br /> MW-8 <br /> 190 09/18/03 25 130 64 340 3,200 — 22 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 <8 0 c 08 1061 000 -871 <br /> 12/02/03 22 43 47 13 320 — 079 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 — 00 985 000 -795 <br /> 03/03104 56 140 59 360 2,500 67 140 <0 50 <0 50 <0 50 <0 50 <0 50 — -- d 03 747 000 -557 <br /> 06/09/04 85 1 200 63 1 370 1 3,500 — 110 130 <0501 <050 <0 50 <0 50 <0 50 — - — 02 8 99 000 -709 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tertamyl methyl ether TOC=Top of rasing elevation in feet above mean sea level <br /> MtBE=Methyl-tent-butyl ether 12 RCA=1 2-dichioroethane pg/L=micrograms per liter <br /> TBA=Tart Butanol EDB=1 2-libromoethane mglL=milligrams per liter <br /> DIPE=011sopropyl ether DTW=Depth to water —=Not sampled/not measured <br /> EtBE=Ethyl-tert-butyl ether SPT=Separate-phase hydrocarbon thickness <br /> WTE=Water table elevation <br /> Notes <br /> Historical data prior to 03/17/03 sample date provided by Shaw E81 STEX TPHg and MtBE analyzed using EPA Method 802018D15 Modred <br /> Samples analyzed using EPA Method 82608 starting Hath 03117/03 sample date <br /> a=Method Blank Contamination The associated method blank contains the target analyte ata reportable level <br /> b=Matrix SpikelMatnx Spike Duplicate for the analytes Benzene MtBE was affected by the analyte concentrations already present in the un-spiked sample <br /> c=The Method Reporting Limit for Acetone has been increased due to the presence of an interfering compound <br /> d=Matrix SpikelMatnx Spike Duplicate Results for the analyte MtBE were affected by the analyte concentrations already present in the un-spiked sample <br /> e=Hydrocarbons reported as TPHg do not exhibit a typical Gasoline chromatographic pattern <br /> 1\7 Elevenl7 11 Stares114117\Tables\14117 04.20 xisHistoncal Water Page 6 of 6 <br />