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TABLE 2(Continued) GROUNDWATER ANALYTICAL DATA USA STATION 9110 STOCKTON,CALIFORNIA Well ID Date TPH G TPH D Benne' Tolneire Ethyl- Xylene Tetsl MTBE Sampled benzene Lead (no' . ( (u2!1): ( JO ice} (URM010) (ieM:.. . MW-1 01/24/97 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(O.5) NA NA 10/31/97 1,800 NA 0.6 18 1.4 5.0 NA NA O V22/98 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) 01/21/99 400 NA ND(0.5) 6.3 ND(0.5) 0.64 NA 300 04130/99 380 NA 1.0 13 1.5 1.4 NA 130 07/07/99 750 NA 0.71 19 19 3.1 NA 64 10/21/99 260 NA ND(0.5) 5.6 ND(0.5) 1 NA 81 01/13/00 160 NA ND(O.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 07/11100 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(O.5) NA 12 01/11/01 160 NA ND(0.5) 7.9 ND(0.5) ND(0.5) NA 65 04/30/01 610 NA 1 0.77 20 ND(O.5) 2.1 NA 47 MW-2 01/24/97 74 NA ND(0.5) 7.0 ND(0.5) ND(0.5) NA NA 04/21/97 190 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(0.5) ND(0.5) ND(0.5) NA NA 10/31/97 NS NS NS NS NS NS NS NS 01/22/98 140 NA ND(O.5) 5.1 ND(0.5) ND(0.5) NA NA • 04/16/98 71 NA ND(0.5) 3.3 ND(O.5) ND(0.5) NA ND(5.0) 07/17/98 56 NA ND(0.5) ND(O.5) ND(O.5) ND(0.5) NA ND(5.0) 10/20/98 ND(50) NA ND(0.5) ND(0.5) ND(O.5) ND(0.5) NA ND(5.0) 01/21/99 ND(50) NA ND(0.5) ND(O.5) ND(O.5) ND(O.5) NA ND(5.0) 04/30/99 ND(50) NA ND(O.5) ND(0.5) ND(O.5) ND(0.5) NA ND(5.0) 07/07199 ND(50) NA ND(0.5) ND(0,5) ND(O.5) ND(O.5) NA ND(5.0) 10/21/99 64 NA ND(O.5) ND(0.5) ND(O.5) ND(O.5) NA ND(5.0) 01/13/00 ND(50) NA ND(O.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(O.5) NA ND(5.0) 07/11/00 ND(50) NA ND(0.5) ND(O.5) ND(0.5) ND(0.5) NA ND(5.0) 10/31/00 ND(50) NA ND(O.5) 1.7 ND(O.5) ND(0.5) NA ND(5.0) O1/11101 ND(50) NA ND(O.5) ND(0.5) ND(O.5) ND(O.5) NA ND(5.0) 04/30/01 65 NA ND(0.5) 0.92 ND(0.5) 2.1 NA b5 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 ug/l Micrograms per liter mg/l Milligrams per liter ND Not detected at the method detection limit * Unknown hydrocarbon present in the TPH G range ** Ressampled,assumption that MW-3 and MW-6 were switched on October 20,1998 1