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• Talk 0 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7 Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton CA <br /> Well Ethyl- MtBE 1,2- Meth Eth- Ace- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPS EtBE TAME DCA EDS enol enol tone Notes Oxygen DTVY SPT WTE <br /> TOC 1L IL IL IL L L L IL 1L L L L L IL L (mall-) feet feet feet <br /> MW-7 <br /> 1 19 11/05/01 <0 5 <0 5 <0 5 <0 5 <50 — <5 <20 <5 <5 <5 <5 <5 - — — 1 0 1020 000 -901 <br /> 153 01/08/02 — — — — -- — -- — — — — — — — _ — 09 — 000 — <br /> 04/12102 <0 5 <0 5 <0 5 <0 5 <50 <5 24 <5 <0 5 <0 5 <0 5 — — __ _ _ 10 747 000 -594 <br /> 07109/02 <05 <0 5 <0 5 <05 <50 <5 24 <5 <0 5 <0 5 <05 — — -- — — 1 1 790 000 -637 <br /> 10116/02 <0 5 <0 5 <05 <0 5 <50 <5 052 15 <0 5 <0 5 <0 5 -- — — - — 10 943 000 -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 /> 05/29/03 <0 50 <0 50 <0 50 <0 50 <50 — 42 <5 0 <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 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 <5 0 23 954 000 -856 <br /> 12/02/03 <0 50 <0 50 <0 50 <0 50 <50 — 17 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 -- 01 909 000 -811 <br /> 03103104 <br /> <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 /> 06/09/04 - - - -- - -- - - - - - - -- - - - <br /> 09116l04 <0 50 <0 50 <0 50 <0 50 <50 1 1 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 32 981 000 -883 <br /> MWS <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 <5G <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 — 00 985 000 -795 <br /> 03/03/04 56 140 59 1 360 2,500 — 67 140 <0 50 <0 50 <0 50 <0 50 <0 50 — — — d 03 747 000 -557 <br /> 061091041 85 200 63 370 3,500 — 110 130 <0 50 <0 50 <0 50 <0 50 <0 50 -- — — 02 8 99 0 00 -7 09 <br /> 09/16/04 32 6o 12 68 670 61 65 <0 50 <0 50 <0 50 <0 50 <0 50 18 1052 000 -862 <br /> ExplanahOn <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tertamyl-methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl-tert butyl ether 12 DCA=1 2-dichloroethene pgA.=micrograms per liter <br /> TBA=Tert-Butanol EDB=1 2-dibromoethane mgr-=milligrams per liter <br /> DIPE=Drlsopropyl ether DTVV=Depth to water —=Not sampled/not measured <br /> ELBE=Ethylert-butyl ether SPT=Separate-phase hydrocarbon thickness <br /> WTE=Water table elevation <br /> Notes <br /> Historical data prior to 03/17103 sample date provided by Shaw E&I BTEX TPHg and MTBE analyzed using EPA Method 6020/8015 Modrhed <br /> Samples analyzed using EPA Method 82606 starting with 03117103 sample date <br /> a=Method Blank Contamination The associated method blank contains the target analyte at a reportable level <br /> b=Matrix spike/Matnx 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=Matra Sprke/Matnx 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 /> 157-ElevenV 11 StoreS1141171Tables114117 Current GroundwateridsHistoncal Water Page 6 of 6 <br />