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Tail1 • Groundwater Monitoring Data Former Dolly Madison Facility 1426 South Lincoln Street Stockton, California Top of Static Water Groundwater Top of Well Casing Level Elevation Screen Ethyl- Total ID Date feet feet feet feet TPHG Benzene Toluene benzene Xylenes MTBE[11 Observations— MW-1 03/06/97 903 23 81 -1478 12 18,000 4,400 280 890 1,200 <300* FP=No,S=No MW-1 05/19/97 903 23 08 -1405 7,300 1,200 12 360 550 NA FP=No,S=No MW-1 08/11/97 903 23 77 -1474 860 130 <0 5 25 66 NA FP=No,S=No MW-1 1.1/17/97 903 2453 -1550 280 56 <0 5 15 14 NA[2] FP=No,S=No MW-1 02/11/98 903 2168 -1265 1,600 130 11 20 260 NA[2] FP=No,S=No MW-1 05/21/98 903 1856 -953 1,050 325 <5 291 63 9 <50 FP=No,S=No MW-1 08/11/98 9 03 1861 -958 251 289 <0 5 520 627 <5 FP=No,S=No MW-1 11/09/98 903 19 70 -1067 975 517 <0 5 <0 5 0 684 <5 FP=No,S=No MW-2 03/06/97 9 17 23 55 -1438 15 220 33 11 2 5 23 <3 FP=No,S=No MW-2 05/19/97 917 2326 -1409 100 <0 5 <0 5 <0 5 <0 5 NA FP=No,S=No MW-2 08/21/97 9 17 2414 -1497 240 20 <0 5 18 53 NA FP=No,S=No MW-2 11/17/97 9 17 25 16 -1599 290 48 <0 5 31 2 8 NA[2] FP=No,S=No MW-2 02/11/98 917 2145 -1228 69 28 <0 5 11 055 NA[2] FP=No,S=No MW-2 05/21/98 917 18 65 -948 <50 <0 5 <0 5 <0 5 <0 5 <5 FP=No, S=No MW-2 08/11/98 9 17 1883 -966 210 3 61 <0 5 776 862 <5 FP=No,S=No MW-2 11/09/98 9 17 19 93 -1076 206 0 893 <0 5 287 0 832 <5 FP=No,S=No Results in parts per billion •=The method reporting limits was elevated due to high analyte concentration requiring sample dilution <=Less than the detection limits used by laboratory PHG=Total petroleum hydrocarbons as gasoline TBE=Methyl tert-butyl ether A=Not analyzed FP=Floating product =Sheen [1]=MTBE was analyzed using USEPA Method 8020 L21=See Table 2 TBE analysts using USEPA Method 8260 CP1E\IBCIQTP LYIIBCQ498 XLS Emcon Table 1 12/4/98