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TABLE 2 (Continued) GROUNDWATER ANALYTICAL DATA USA STATION#110 STOCKTON,CALIFORNIA 104 �x s Well ID Date TPH G TPH D Benzene Toluene Ethyl- Xylene Total MTBE Sampled _ >benzene Lead ' (ug/l) {mgll}w �(ug/l {ug/l} (ugll) (nP,ll) (►n�) (ug/1) MW-1 01/24/97 1,100 NA 082 25 18 3 1 NA NA 04/21/97 1,400 NA 24 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 06 18 1 4 50 NA NA 01/22/98 1,100 NA 23 13 087 1 8 NA NA ' 04/16/98 430 NA ND(0 5) 20 ND(0 5) 22 NA ND(5 0) 07/17/98 520 NA ND(0 5) 99 058 1 3 NA ND(5 0) 10/20/98 220 NA 066 48 ND(0 5) 068 NA ND(5 0) 01/21/99 400 NA ND(0 5) 63 ND(0 5) 064 NA 300 04/30/99 380 NA 10 13 15 14 NA 130 07/07/99 750 NA 071 19 1 9 3 1 NA 64 10/21/99 260 NA ND(O S 56 ND(O 5 I NA 81 MW-2 01/24/97 74 NA ND(0 5) 70 ND(0 5) ND(0 5) NA NA 04/21/97 190 NA ND(0 5) 52 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(0 5) 5 1 ND(0 5) ND(0 S) NA NA 04/16/98 71 NA ND(0 5) 3 3 ND(0 5) ND(0 5) NA ND(5 0) 07/17/98 56 NA ND(0 5) ND(0 5) ND(0 5) ND(0 5) NA ND(5 0) 10/20/98 ND(50) NA ND(0 5) ND(0 5) ND(0 5) ND(0 5) NA ND(5 0) 01/21/99 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) ' 10/21/99 64 NA ND(0 5) 1 ND(0 5) ND(0 5) 1,D(0 5) NA ND(5 0) TPH G Total petroleum hydrocarbons in the gasoline range t TPH D Total petroleum hydrocarbons in the diesel range MTBE Methyl-tert-butyl-ether ug/l Micrograms per Iiter mg/l Milligrams per liter ND Not detected at the method detection limit NS Not sampled NA Not analyzed ( } Method detection Limit e ' * Unknown hydrocarbon present in the TPH G range ** Resampled,assumption that MW-3 and MW-6 were switched on October 20, 1998