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�2 ! <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7 Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton CA <br /> Well IDI Ethyl- MtBE 1,2- Meth- Eth- Ace Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME DGA EDB anal anol tone Notes -oxygen 07WSPT WTE <br /> TOG 1L L 1L L li- L L 1L !L L L 1L 1L 1L m 1L111feetIfeet) feet <br /> MW-8 <br /> 190 09/18/03 25 130 64 340 3,200 — 22 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 <80 c 08 1061 000 -871 <br /> 12/02/03 22 43 47 13 320 - 079 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 — 00 985 000 -795 <br /> 03/03/04 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 85 200 63 370 3,500 — 110 130 <0 50 <0 50 <0 50 <0 50 <0 50 — 02 899 000 -709 <br /> 09116/04 32 60 12 68 670 — 61 65 <0 50 <0 50 <0 50 <0 50 <0 50 — - 18 1052 000 -862 <br /> 12121/04 <0 50 <0 50 <0 50 <0 50 <50 — <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 - — 10 1015 000 -825 <br /> 01128/05 10 1 2 <0 50 075 <50 — 42 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 - — 07 883 000 -693 <br /> 06/27/05 25 51 28 150 11100 -- 76 79 <0 50 <0 50 <0 50 <0 50 <0 50 — — — 1 5 829 000 -639 <br /> 09/30/05 120 220 100 460 3,300 — 190 170 <0 50 <0 50 <0 50 <0 50 <0 50 - 25 889 000 -699 <br /> 12/09/05 24 45 40 160 1,200 180 150 <0 50 <0 50 <0 50 <0 50 <0 50 — — — 09 923 000 -733 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Teri amyl-methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> MTBE=Methyl-tert butyl ether 12 DCA=1 2-0rchloroethane pg/L=micrograms per ider <br /> TBA=Teri Butanol EDB=12 dibromoethane mgA.=milligrams per Icer <br /> DIPE=Dusopropyt ether DTW=Depth to water —=Not sampledtnot measured <br /> ELBE=Ethyl-tert-butyl ether SPT=Separate-phase hydrocarbon thickness <br /> WTE=Water table elevation <br /> hLqtes <br /> Historical data prior to 03/17103 sample date provided by Shaw E&I BTEX TPHg and MtBE analyzed using EPA Method 8020/8015 Modified <br /> Samples analyzed by EPA Method 82608 starting with 03/17103 sample date <br /> a=Method Blank Contamination The associated method blank contains the target analyte at a reportable level <br /> b=Matnx 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 Aoetone has been increased due to the presence of an interfering compound <br /> d=Matrix Spike/Matnx Spike Duplicate Results for the analyte MTBE were affected by the anayte concentrations already present in the un-spiked sample <br /> e=Hydrocarbons reported as TPHg do not exhibit a typical Gasoline chromatographic pattern <br /> f=Matrix Spike/Matnx Spike Duplicate Results for the analyte Benzene were affected by the einatyte concentrations already present in the un-spiked sample <br /> I <br /> I <br /> 117 ElevenU 11 Stores1141171TablesL14117 Current Groundwater AsHistoncal Water Page 9 of 9 <br />