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TABLE 4 <br /> GROUNDWATER ANALYTICAL RESULTS(TPH and BTEX)t•2,3 ! <br /> ALDEN PARK <br /> Tracy,San Joaquin County,California <br /> Date <br /> Concentrations reported inµg/L ! <br /> Ethyl- Total <br /> Well ID Sampled TPHd TPHdsg TPHg Benzene Toluene benzene Xylenes <br /> SCREENING WQO 100^ 100° 5^ 0.15 5 42° 29° 17° <br /> LEVELS ESL 100 e 100° 100° 1 7 40 e 30`' 20 <br /> 10/17/00 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> 01/23/01 NS NS NS NS NS NS NS <br /> 05/30/01 NS NS NS NS NS NS NS <br /> 03/11/03 NS NS NS NS NS NS NS <br /> MW-17 08/26/03 <50 NA NA NS NS NS NS <br /> (cont.) 02/18/04 <50 NA NA NS NS NS NS ! <br /> 08/05/04 <50 NA NA NS NS NS NS <br /> 02/23/05 <50 NA NA NS NS NS NS <br /> 08/18/05 <29 NA NA NS NS NS NS <br /> 02/16/06 <50 NA NA NS NS NS NS ! <br /> MW-18 Well not sampled due to the presence of SPO <br /> MW 19 04/03/97 660 230 200 <0.5 <0.5 <0.5 <2 <br /> (well properly 04/03/97 D 1,200 480 140 NA NA NA NA ■ <br /> destroyed in 07/09/97 NA 530 130 <0.5 <0.5 <0.5 <2 I <br /> 3/00) 10/08/97 NA 400 60 <0.5 <0.5 <0.5 <2 <br /> 01/30/98 NA 100 <50 <0.5 <0.5 <0.5 <1.5 <br /> MW-20 Well not sampled due to the presence of SPO ! <br /> 04/03/97 2,600 320 150 <0.5 <0.5 <0.5 <2 <br /> 07/09/97 NA 440 140 <0.5 <0.5 <0.5 <2 <br /> 10/08/97 NA 2,100 70 <0.5 <0.5 <0.5 <2 ! <br /> 01/30/98 NA 150 100 <0.5 <0.5 <0.5 <1.5 <br /> 07/20/00 4,000 2,100 <50 <0.5 <0.5 <0.5 <0.5 <br /> 10/17/00 2,100 1,100 <250 <2.5 " <2.5" <2.5" <2.5" <br /> 01/23/01 2,400 1,300 <250 <2.5 " <2.5 <2.5 s <2.5" ! <br /> 05/30/01 830 110/110, <250 <2.5 " <2.5 " <2.5" <2.5 s <br /> 07/26/01 1,900 480 <250 <2.5 " <2.5 " <2.5" <2.5 a <br /> 10/30/01 1,900 1,000/760'' <250 Q.5 " <2.5" <2.5" <2.5 s <br /> MW-21 01/31/02 1,800 210/150 � <250 <2.5" <2.5 s <2.5 a <2.5 s <br /> 01/31/02 (F) 1,500 150/<50'' NA NA NA NA NA <br /> 04/23/02 2,100 540/450'' <500" <5" <5" <5 B <5" <br /> 07/24/02 2,400 270/230 <250" <2.5" <2.5" <2.5" <2.5 s <br /> 11/25/02 2,100 780/590 <250" <2.5" Q.5" <2.5" Q.5" <br /> 03/11/02 2,000 260/260'' NA NA NA NA NA <br /> 08/27/03 Not sampled due to the presence of SPO/sheen <br /> 02/18/04 Not sampled due to the presence of SPO/sheen <br /> 08/05/04 Not sampled due to the presence of SPO;oleophilic sock placed in well <br /> 02/23/05 Not sampled due to the presence of SPO;oleophilic sock placed in well <br /> 08/18/05 Not sampled due to the presence of SPO;oleophilic sock placed in well <br /> 02/16/06 lNot sampled due to the presence of SPO;oleophilic sock placed in well <br /> I <br /> Page 9 of 10 40leidos <br />