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APPENDIX D(Continued) <br /> HISTORICAL GROUNDWATER ANALYTICAL DATA <br /> USA STATION#110 <br /> STOCKTON,CALIFORNIA <br /> Well ID Date TPH G. TPH D Benzene Toluene:` Et6yI- Xylene Total MTBE <br /> Sampled <br /> enzen <br /> b e' Lead. <br /> . . <br /> (m9/1) {pg/l}, (119/1) (139/1) (u" (mi) <br /> MW-61' 10/10/95 ND(50) ND(10) ND(0.5) ND(0.5) ND(0.5) ND(0.5) ND(OA02) NA <br /> 01/18/96 ND(50) ND(0.05) 4.3 6.5 0.78 4.8 ND(0.002) NA <br /> 04/26/96 ND(50) ND(0.05) ND(0.5) ND(0.5) ND(0.5) ND(0.5) ND(0.002) NA <br /> 07/19/96 ND(50) ND(0.05) ND(0.5) ND(0.5) ND(0.5) ND(0.5) ND(0.003) ND(5.0) <br /> 10/30/96 ND(50) ND(0.05) ND(O.5) ND(O.5) ND(0.5) ND(0.5) ND(0.002) ND(5.0) <br /> 01/24/97 ND(50) NA ND(0.5) ND(O.5) ND(0.5) ND(0.5) NA NA <br /> 04/21/97 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) <br /> 07/30/97 ND(50). NA ND(O.5) ND(0-5) ND(0.5) ND(0.5) NA NA <br /> 10/31/97 ND(50) NA ND(0.5) ND(O.5) ND(O.5) ND(O.5) NA NA <br /> 01/22/98 ND(50) NA ND(O.5) ND(O.5) ND(0.5) ND(0.5) NA NA <br /> 04/16/98 57 NA 0.73 3.9 ND(0.5) 2.5 NA ND(5.0) <br /> 07/17/98 ND(50) NA ND(0.5) ND(0.5) ND(O.5) ND(O.5) NA ND(5.0) <br /> 10/20/98 --_-- -__-- __--- <br /> MW-1 01/24/97 1,100 NA 0.82 25 1.8 <br /> 3.1 NA NA <br /> 04/21/97 1,400 NA 2.4 13 1.6 5.7 NA ND(5.0) <br /> 07/30/97 1,200* NA ND(0.5) ND(0.5) ND(O.5) ND(0.5) NA NA <br /> 10/31/97 1,800 NA 0.6 18 1.4 5.0 NA NA <br /> 01/22/98 1,100 NA 2.3 13 0.87 1.8 NA NA <br /> i. 04/16/98 430 NA ND(0.5) 20 ND(O.5) 2.2 NA ND(5.0) <br /> 07/17/98 520 NA ND(O.5) 9.9 0.58 I.3 NA ND(5.0) <br /> 10/20/98 220 NA 0.66 4.8 ND(O.5) 0.68 NA ND(5.0) <br /> MW-2 01/24/97 74 NA ND(O.5) 7.0 ND(O.5) ND(0.5) NA NA <br /> 04/21/97 190 NA ND(0.5) 5.2 ND(O.5) ND(0.5) NA ND(5.0) <br /> 07/30/97 ND(50) NA ND(0.5) ND(0.5) ND(O.5) ND(0.5) NA NA <br /> 10/31/97 NS NS NS NS NS NS NS <br /> NS <br /> + 01/22/98 140 NA ND(0.5) 5.1 ND(O.5) ND(0.5) NA NA <br /> 04/16/98 71 NA ND(0.5) 3.3 ND(O.5) ND(O.5) NA ND(5.0) <br /> 07/I7/98 56 NA ND(0.5) ND(O.5) ND(0.5) ND(0.5) NA ND(5.0) <br /> 10/20/98 ND(50) NA ND(0.5) ND(0.5) ND(O.5) ND(0.5) NA ND(5.0) <br /> TPH G Total petroleum hydrocarbons in the gasoline range NS <br /> TPH D Total petroleum hydrocarbons in the diesel ran Not sampled <br /> a <br /> MTBE Methyl-tert-butyl-ether g NA Not analyzed <br /> ug/1 Micrograms per liter O Method detection Limit <br /> mg/1 Milligrams per liter . <br /> ND Not detected at the method detection limit <br /> Unknown hydrocarbon present in the TPH G range <br /> ** Resampled,assumption that MW-3 and MW-6 were switched on October 20, 1998 <br /> G:\DATA\5007\GWDataot-02app4.wb3 <br /> 0 <br /> / <br />