ARCHIVED REPORTS_ANNUAL 2010 GROUNDWATER MONITORING AND SAMPLING REPORT

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TABLE 2 GROUNDWATER ANALYTICAL RESULTS (TPH and BTEX)12,1 ' ALDEN PARK Tracy, California Concentrations reported in pWL ' Date Ethyl- Total Well ID Sampled TPHd TPHdsg TPHg Benzene Toluene benzene Xylenes SCREENING WQp 100 4 1001 54 0.15 ' 42 ° 29" 17 a LEVELS ESL 1006 100 6 1001 1 7 40 6 30 6 20 6 MW1202/18/04 <50 NA NA NS NS NS NS (cont.) 08/05/04 <50 NA NA NS NS NS NS 02/23/05 <50 NA NA NS NS NS NS 08/17/05 <29 NA NA NS NS NS NS ' 02/16/06 <50 NA NA NS NS NS NS 08/02/06 <50 NA NA NS NS NS NS 01/31/07 <50 NA NA NS NS NS NS 01/31/08 <50 NA NS NS NS NS NS 01/15/09 <50 NA NS NS NS NS NS 01/05/10 <50 NA NS NS NS NS NS 04/23/96 600 NA <500 <0.2 <0.2 <0.3 <0.4 04/02/97 NS NS NS NS NS NS NS 07/07/97 NS NS NS NS NS NS NS ' 10/08/97 NS NS NS NS NS NS NS 01/30/98 NS NS NS NS NS NS NS 08/03/00 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 10/17/00 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 MW-13 01/23/01 NS NS NS NS NS NS NS (well properly destroyed in 05/30/01 NS NS NS NS NS NS NS 4/06) 03/11/03 NS NS NS NS NS NS NS 08/26/03 <50 NA NA NS NS NS NS 02/18/04 60 NA NA NS NS NS NS ' 08/05/04 <50 NA NA NS NS NS NS 02/23/05 <50 NA NA NS NS NS NS 08/17/05 <29 NA NA NS NS NS NS 02/16/06 <50 NA NA NS NS NS NS 02/16/06 D <50 NA NA NS NS NS NS 04/22/96 <500 NA <500 <0.2 <0.2 <0.3 <0.4 04/02/97 NS NS NS NS NS NS NS 07/07/97 NS NS NS NS NS NS NS 10/08/97 NS NS NS NS NS NS NS 01/30/98 NS NS NS NS NS NS NS 07/20/00 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 MW-14 10/17/00 60 <50 <50 <0.5 <0.5 <0.5 <0.5 01/23/01 NS NS NS NS NS NS NS 05/30/01 NS NS NS NS NS NS NS 03/11/03 NS NS NS NS NS NS NS 08/26/03 <50 NA NA NS NS NS NS 02/18/04 <50 NA NA NS NS NS NS ' 08/06/04 1 50 NA NA NS NS NS NS ' 47The Benham Companies LLC Page 10 �`' FNTally pwn[d 5ub5Niary € vom sne�re io sormmo.