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Table 2 Historical Groundwater Analytical Data 7-Eleven Store#14117 2725 Country Club Boulevard Stockton California Well ID/ 11 Ethyl- MTBE Dissolved Elevation Date Benzene Toluene benzene Xylenes TPH-G 8021 BI 8260 TBA RIPE ETRE TAME 1,2-DCA EDB Oxygen , DTW SPT WTE (TOC) (ljgL) WL) (PgL) (ljgL) (ugL) (PgL) I INgL) (pgL) (PgL) (4r9L) (11gL) (IjgL) (POL) (m /C) {feet) (feet) (feet) MW-5 163 11105/01 <0 5 <0 5 <0 5 <0 51 <50 <5 <20 <5 <5 <5 <5 <5 09 :9 73 0001 -820 126 01/08/02 <5 <5 <5 <5 <50 - <10 23 <5 <5 <5 - 08 660 0 00 -534 04/12/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0.5 <5 <0 5 <0 5 <0-5 - 08 722 -000 -5.96 07/09/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 - 08 740 000 -614 10/16/02 <0 5 <0 5 <0 5 <0 S <50 <5 <0.5 <5 <0 5 <0 5 <0 5 0 9 9 00 000 -774 MW-6 126 11/05/01 <0 5 28 <0 5 0,99 <50 <5 <20 <5 <5 <5 <5 <5 10 944 000 -818 1 19 01/08/02 <5 <5 <5 <5 e50 -- <10 <20 <5 <5 <5 10 754 000 -635 04112102 <0 5 <0-5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0-5 - 12 726 000 -607 07/09/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 - -- 10 535 000 -416. 10116/02 <0 5 <0 51 <0 5 <0 5 <50 <5 <0.5 <5 <05- <0 5 <0 5 10 9.00 0001 -7 81 MW-7 119 11/05/01 <0 5 <0 5 <0 5 <0 51 <50 <5 <20 <5 <5 <5 <5 <5 10 1020 000 -901 153 01/08/02 -- - - -- - -- 09 -- 000 - 04/12/02 <0 5 <0 5 <0 5 <0 5 <50 <5 2.4 <5 <0 5 <0 5 <0.5 - - 10 747 000 -594 07!09102 <0 5 <0 5 <0 5 <0 5 <50 <5 24 <5 <0 5 <0 5 <0 5 -- 1 1 790 000 -637 10116/02 <0.5 <0 5 <0 5 <0 5 <50 <5 052 15 <0 5 <0 5 <0 5_ 10 93 50-0 -7 90 Explanation TBA=tert-butanol 1 2-DCA=1,2-dichloroelhane pg/L=Micrograms per liter RIPE=dusopropyl ether ED8=1 2-dibromoethane mg1L=Milligrams per liter ETBE=ethyl-tent butyl ether MTBE=methyl tert-butyl ether TAME=tert-amylmethyl ether TPH-G=total petroleum hydrocarbons-as-gasoline —=Not availablelnot analyzed 'Method Blank Contamination The associated method blank contains the target analyte at a reportable level 7-11\1 41 1 7 tbl As 3 of 3 01-30-03