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i <br /> TABLE 4 <br /> GROUNDWATER ANALYTICAL RESULTS(TPH and BTEX)t'2,3 <br /> ALDEN PARK <br /> Tracy,San Joaquin County,California <br /> Concentrations reported inµg/L ' <br /> Date Ethyl- Total <br /> Well ID Sampled TPHd TPHdsg TPHg Benzene Toluene benzene Xylenes <br /> SCREENING WQO 100° 100° 5° 0.15 s 42" 29^ 17° <br /> LEVELS ESL 100 6 100 100 1 7 40 30`' 20 <br /> 04/24/96 <500 NA <500 <0.2 <0.2 <0.3 <0.4 <br /> 04/02/97 <50 NA <50 <0.5 <0.5 <0.5 <2 <br /> 07/08/97 NA <50 <50 <0.5 <0.5 <0.5 <2 <br /> 10/08/97 NA <50 <50 <0.5 <0.5 <0.5 <2 <br /> 01/30/98 NA <50 <50 <0.5 <0.5 <0.5 <1.5 <br /> 07/20/00 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 ' <br /> 10/17/00 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> 01/23/01 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> 05/30/01 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> 07/26/01 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> 10/30/01 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> 01/31/02 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> 04/23/02 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> 07/24/02 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> 11/25/02 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> MW-12 03/11/03 <50 <50 NA NS NS NS NS <br /> 08/26/03 <50 NA NA NS NS NS NS <br /> 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 I <br /> 08/17/05 <29 NA NA NS NS NS NS <br /> 02/16/06 <50 NA NA NS NS NS NS <br /> 08/02/06 <50 NA NA NS NS NS NS <br /> 01/31/07 <50 NA NA NS NS NS NS <br /> 01/31/08 <50 NA NS NS NS NS NS <br /> 01/15/09 <50 NA NS NS NS NS NS <br /> 01/05/10 <50 NA NS NS NS NS NS <br /> 03/08/11 <110 NA NS NS NS NS NS <br /> 03/20/12 <110 NA NS NS NS NS NS <br /> 04/17/13 <50 NA NS NS NS NS NS <br /> 03/28/14 <50 NA NS NS NS NS NS <br /> 04/23/96 <500 NA <500 <0.2 <0.2 <0.3 <0.4 <br /> 04/02/97 NS NS NS NS NS NS NS <br /> 07/07/97 NS NS NS NS NS NS NS I <br /> 10/08/97 NS NS NS NS NS NS NS <br /> MW-l3 01/30/98 NS NS NS NS NS NS NS <br /> (well properly 08/03/00 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <br /> destroyed in <br /> 4/06) 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 /> 08/26/03 <50 NA NA NS NS NS NS <br /> leidos <br /> Page 7 of 10 <br />