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Table 1A Groundwater Analytical Data 7-Eleven Store#19976 1399 North Main Street Manteca California Well No/ Ethyl- MTBE Dissolved Elevation Date Benzene Toluene benzene Xylenes TPH-G 8020 8260 TBA DIPE ETBE TAME 1,2-DCA Ethanol Methanol Oxygen DTW SPT WTE (TOC) (pg/L) (pg1L) (pg1L) (pglL) (pglL) (pg/L) (pg1L) (pg/L) (pglL) (pglL) (pg/L) (pgIL) (rnglL) (mg1L) (mg1L) (ft) (ft) (ft) MW-5A*(cont) 01/30/02 <0 5 <0 5 <0 5 <0 5 <50 – <5 <20 <5 <5 <5 - - 1 1 1855 000 1293 04/04/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <05 <0 5 __ __ _ 09 1952 000 1196 07/08/02 <0 5 <0 5 <0 5 <0 5 <50 <5 2 5 <5 <0 5 <0 5 <0 5 - - 10 2085 000 1063 10/03!02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 -- -- -- 09 1985 000 1163 MW-6 3365 01124/00 11 327 183 173 1,010 <5 <5 <20 <5 <5 <5 - 09 1940 000 1425 04/06/00 <0 5 084 2 27 390 -- <1 <50 <2 <2 <2 - 12 1825 000 1540 07/21/00 <0 5 27 51 54 1,200 – <1 <50 <2 <2 <2 <1 <5 <5 07 1973 000 1392 10/12/00 061 <0 5 29 65 200 <1 <25 <2 <2 <2 <1 <5 <5 05 1985 000 1 1380 01/16/01 <0 5 05 30— 4 210 - <1 <50 <2 <2 <2 -- – – 1 0 1977 000 1388 04/02/01 <0 5 27 6 83 560 - <1 <50 <2 <2 <2 - - - 07 2056 000 1309 06/26/01 <0 5 <0 5 1 2 26 150 – <1 <50 <2 <2 <2 - – – 07 2250 000 11 15 11/28/01 1 <0 5 077 22 170 – <5 <20 <5 <5 <5 -- – - 14 2280 000 1085 01/30/02 <0 5 <0 5 <0 5 <0 5 88 -- <5 <20 <5 <5 <5 – – 1 2 2056 000 1309 04/04/02 <0 5 <0 5 <0 5 <0 5 180b 1 <5 063 76 <0 5 <0 5 <0 5 – – – 1 1 21 42 000 1223 07108/02 <0 5 085 <0 5 <0 5 100 <5 073 <5 <05 <0 5 <0 5 – – – 1 2 2255 000 11 10 10/03/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 – – – 1 0 2175 000 11 90 MW-7 3245 10/12/00 -- 01/16/01 01/16/01 0 95 <0 5 15*** 23 <100 - 56 1 <50 <2 <2 <2 - - – 06 1864 000 1381 04/02/01 <0 5 <0 5 1 2 27 150 -- 42 <50 <2 <2 <2 - -- - 1 0 1944 000 1301 06/26/01 <0 5 <0 5 1 5 27 170 - 55 <50 <2 <2 <2 – – - 09 21 70 000 1075 11/28/01 <0 5 <0 5 <0 5 <0 5 57 – <5 <20 <5 <5 <5 -- -- -- 1 0 2181 000 1064 01!30102 <0 5 <0 5 <0 5 052 91 - 13 <20 <5 <5 <5 – – – 1 0 1956 000 1289 04/04/02 <0 5 <0 5 <0 5 <0 5 <50 82 86 <5 <0 5 <0 5 <0 5 - – – 1 3 2037 000 1208 07/08/02 <0 5 085 1 <05 <0 5 69 1 <5 38 <5 1 <05 <05 <0 5 -- – – 1 1 21 50 000 1095 10/03/02 <0 5 <0 5 <05 <0 5 <50 <5 2 6 <5 <0 5 <0 5 <0 5 -- 1 1 20 80 0 00 11 65 Exn anatlon TPH G=Total petroleum hydrocarbons as-gasoline pg/L=micrograms per Liter MTBE=Methyl terl butyl ether mglL=milligrams per Liter TBA=tert Butanol —=Not analyzed/Not available DIPE=Dtisoprophyl ether '=Deep zone well ETRE=Ethyf Cert butyl ether " =Laboratory results for the 11104M samples collected from the nested wells MW 1 and MW 1A were switched The table shows corrected data TAME=tert Amylmethyl ether ""'=Method Blank Contamination The method blank contains the targeted analyte at a reportable level 1 2 DCA=t 2 dichloroethane 7-11/19976 tab As Page 5 of 5 11-01-02