ARCHIVED REPORTS_ANNUAL 2014 GRAOUNDWATER MONITORING AND SAMPLING REPORT

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i TABLE 4 GROUNDWATER ANALYTICAL RESULTS(TPH and BTEX)1,2,3 ALDEN PARK Tracy,San Joaquin County,California Concentrations reported inµg/L Date Ethyl- Total Well ID Sampled TPHd TPHdsg TPHg Benzene Toluene benzene Xylenes SCREENING WQO 100° 100° 5 4 0.15 5 42° 29° 17° LEVELS ESL 100 e 100 6 100 e 1 7 40 e 30 20 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 i 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 i MW-1/KJC 10/17/00 75 <50 <50 <0.5 <0.5 <0.5 <0.5 (well properly 01/23/01 NS NS NS NS NS NS NS destroyed in 05/30/01 NS NS NS NS NS NS NS 4/06) 03/11/03 NS NS NS NS NS NS NS i 08/26/03 <50 NA NS NS NS NS NS 02/18/04 <50 NA NS NS NS NS NS 08/05/04 59 NA NS NS NS NS NS i 02/23/05 <50 NA NS NS NS NS NS 08/17/05 <29 NA NS NS NS NS NS 02/16/06 <50 NA NS NS NS NS NS MW-1 Well not sampled due to the presence of SPO i 04/26/96 <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 i 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-2 10/17/00 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 i (well properly 01/23/01 NS NS NS NS NS NS NS 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 Well contained insufficient water to purge and sample i 02/18/04 Well contained insufficient water to purge and sample 08/05/04 Well contained insufficient water to purge and sample 02/23/05 75 NA NS NS NS NS NS i 08/18/05 <29 NA NS NS NS NS NS 02/16/06 <50 NA NS NS NS NS NS MW-3 Well not sampled due to the presence of SPO i 04/22/96 <500 NA <500 <0.2 <0.2 <0.3 <0.4 04/02/97 NS NS NS NS NS NS NS MW-4 07/08/97 NA <50 <50 <0.5 <0.5 <0.5 <2 10/08/97 NA <50 50 <0.5 <0.5 <0.5 <2 i i i leidos i Page 1 of 10 I