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A 1 S ! GROUNDWATER ELEVATION AND ANALYTICAL DATA Former Dolly Madison Facility 1426 South Lincoln Street Stockton,California Top of Static Water Groundwater Top of Ethyl- Total Well Sampling Casing Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MTBE ID Date feet msl (feet b s) (feet msl) (feet b s) (µ L /L) (µ /L) (µ L) (µ L) (USEPA 8020 MW-2 03/06/97 9 17 23 55 -1438 15 220 33 1 1 2 5 2 3 <3 05/19/97 23 26 -1409 100 <0 5 <0 5 <0 5 <0 5 NA 08/21/97 24 14 -1497 240 20 <0 5 18 5 3 NA 11/17/97 25 16 -1599 290 48 <0 5 31 2 8 NA 02/11/98 2145 -1228 69 2 8 <0 5 1 1 0 55 NA[2] 05/21/98 18 65 -948 <50 <0 5 <0 5 <0 5 <0 5 NA[2] 08/11/98 1883 -966 210 361 <0 5 776 862 <5 11/09/98 1993 -1076 206 0 893 <0 5 2 87 0 832 <5 05/25/98 1958 -941 63 6 0 553 <0 5 109 2 15 <5 08/18/99 1957 -104 124 2 0 585 0 929 0 748 <5 10/11/99 2206 -1289 130 <0 5 <0 5 0 91 <0 5 NA[2] 03/01/00 1881 -964 120 <0 5 <0 5 <0 5 <0 5 NA[2] 06/01/00 1847 -9 3 110 <0 5 <0 5 <0 5 <0 5 NA[2] 08/30/00 1919 -1002 <50 <0 5 <0 5 <0 5 <0 5 NA[2] 11/21/00 2004 -1087 77 <0 5 <0 5 <0 5 <0 5 NA[2] 03/08/01 1941 -1024 0 051 <0 5 <0 5 <0 5 <0 5 NA[2] 05/17/01 1948 -1031 <50 <0 5 <0 5 <0 5 <0 5 NA[2] 08/16/01 2082 -1165 120 <0 5 <0 5 <0 5 <0 5 NA[2] 12/06/01 21 69 -1252 66 <0 50 <0 50 <0 50 <0 50 NA[2] 02/14/02 2041 -1124 71 <0 50 <0 50 <0 50 <0 50 NA[2] 05/03/02 2040 -1123 57 <0 50 <0 50 <0 50 <0 50 NA[2] 08/22/02 21 63 -1246 150 <0 50 <0 50 <0 50 <0 50 NA[2] •=The method reporting limits was elevated due to high analyze concentration requiring sample dilution <=Less than the detection limits used by laboratory TPHG=Total petroleum hydrocarbons as gasoline MTBE=Methyl tertiary butyl ether NA=Not analyzed NA[2]=See Table 2(MTBE analysis by USEPA Method 8260) bgs=below ground surface msl=mean sea level IBC_Stocktor_Quarterly_Data As Page 2 of 2 5TRATU5