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TABLE 2(Continued) GROLTNDWATER ANALYTICAL DATA ' USA STATION#110 STOCKTON.CALIFORYIA Well ED Date TPH G TPH D Benzene Toluene. Ethyl- xylene Total LM BE ' Sampled lxnzens Lead (ug/1) (mg/1) (10€11) NO) (ugn) (ugm (010) (ua.,m ' MW-1 0124197 1,100 NA 0.82 25 1.8 3.1 NA NA 04/21/97 1,400 NA 2.4 13 1.6 5.7 NA ND(5.0) 07/30/97 1.200* NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA NA 10/31/97 1,800 NA 0.6 18 1.4 5.0 NA NA ' 0122198 1.100 NA 2.3 13 0.87 1.8 NA NA 04/16/98 430 NA ND(0.5) 20 ND(0.5) 2.2 NA ND(5.0) 07/17/98 520 NA ND(0.5) 9.9 0.58 1.3 NA ND(5.0) 10/20/98 220 NA 0.66 4.8 ND(0.5) 0.68 NA ND(5.0) 01121/99 400 NA ND(0.5) 6.3 ND(0.5) 0.64 NA 300 ' 04/30/99 380 NA 1.0 13 1.5 1.4 NA 130 07/07/99 750 NA 0.71 19 1.9 3.1 NA 64 1021/99 260 NA ND(0.5) 5.6 ND(0.5) 1 NA 81 01/13/00 160 NA ND(0.5) 7.4 ND(0.5) ND(0.5) NA ND(5.0) ' 04/06/00 720 NA ND(0.5) 19 1.0 1.7 NA 67 07/11/00 160 NA ND(0.5) 4.6 ND(0.5) 0.70 NA 28 10/31/00 76 NA ND(0.5) 4.4 ND(0.5) ND(0.5) NA 12 01/11/01 160 NA ND(0.5) 7.9 1 ND(0.5) ND(0.5) NA 65 ' MW-2 01/24/97 74 NA ND(0.5) 7.0 ND(0.5) ND(0.5) NA NA 0421197 190 NA ND(0,5) 5.2 ND(0.5) ND(0.5) NA ND(5.0) 07/30/97 ND(50) NA ND(0.5) ND(O.5) ND(0.5) ND(0.5) NA NA ' 10/31/97 NS NS NS NS NS NS NS NS 0122/98 140 NA ND(0.5) 5.1 ND(0.5) ND(0.5) NA NA 04/16/98 71 NA ND(0.5) 3.3 ND(0.5) ND(0.5) NA ND(S.0) 07/17/98 56 NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) 1020/98 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) 0121199 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) 04/30/99 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) 07/07/99 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) 1021199 64 NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) ' 01/13/00 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) 04/06/00 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) 07/11100 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) 10/31/00 ND(50) NA ND(0.5) 1.7 ND(0.5) ND(0.5) LNA LND(5.0)01/11/01 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA D(5,0) TPH G Total petroleum hydrocarbons in the gasoline range NS Not sampled TPH D Total petroleum hydrocarbons in the diesel range NA Not analyzed MTBE Methyl-tert-butyl-ether ( ) Method detection Limit USA Micrograms per liter mg/[ Milligrams per liter ' ND Not detected at the method detection limit • Unknown hydrocarbon present in the TPH G range *� Resampled,assumption that MW-3 and MW-6 were switched on October 20,199 9 ' G:1Data\500711 stQtr200 i G W,wb3