ARCHIVED REPORTS_ANNUAL 2014 GRAOUNDWATER MONITORING AND SAMPLING REPORT

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TABLE 4 GROUNDWATER ANALYTICAL RESULTS(TPH and BTEX)t,2,3 ALDEN PARK Tracy,San Joaquin County,California Concentrations reported in gg/L Date I Ethyl- Total Well ID Sampled TPHd TPHdsg I TPHg Benzene Toluene benzene Xylenes SCREENING WQO too, too, 5^ 0.15 s 42° 29° 17° I LEVELS ESL 100 6 100`' 100 6 1 7 40 30 e 20 e 07/26/01 15,000 200/120 9 <250" <2.5 s <2.5 " <2.5 K <2.5" 07/26/01 D 13,000 210/150 <250 s <2.5 " <2.5 " <2.5 s <2.5" 10/30/01 8,500 120/77 ' <250" <2.5" <2.5" <2.5" Q.5 s 10/30/01 D 8,400 110/77° <250" <2.5" <2.5" <2.5 s <2.5" 01/31/02 12,000 870/210 9 <250" <2.5 s <2.5 a <2.5" <2.5" 01/31/02 D 14,000 1,500/190, <250" <2.5 " <2.5 n <2.5 <2.5" 04/23/02 11,000 110/<50`' <500" <5 N <5" <5" <5 x I 04/23/02 D 12,000 120/<50 ' <500" <5 8 <5" <5" <5" 07/24/02 13,000 250/110 ' <500" <5" <5" <5 8 <5 x 07/24/02 D 11,000 92/68'' <500" <5 R <5" <5" <5" 11/25/02 15,000 87/83 <250" <5 " <5 B <5 N <5" 11/25/02 D 16,000 110/86 <250" <2.5 a <2.5 " <2.5 s <2.5 " 03/11/03 13,000 83/74'' NS NS NS NS NS 03/11/03 D 13,000 90/65`' NS NS NS NS NS MW-5 08/27/03 15,000 200/150 ' NS NS NS NS NS (cont.) 08/27/03 D 14,000 180/150 9 NS NS NS NS NS 02/18/04 Not sampled due to the presence of SPO/sheen I 08/05/04 Not sampled due to the presence of SPO;oleophilic sock placed in well 02/23/05 Not sampled due to the presence of SPO;oleophilic sock placed in well 08/18/05 Not sampled due to the presence of SPO;oleophilic sock placed in well I 02/16/06 Not sampled due to the presence of SPO;oleophilic sock placed in well 08/01/06 Not sampled due to the presence of SPO;oleophilic sock placed in well 01/29/07 Not sampled due to the presence of SPO;oleophilic sock placed in well 02/01/08 Not sampled due to the presence of SPO;oleophilic sock placed in well I 01/15/09 Not sampled due to the presence of SPO;oleophilic sock placed in well 01/07/10 Not sampled due to the presence of SPO;oleophilic sock placed in well 03/07/11 Not sampled due to the presence of SPO;oleophilic sock placed in well 03/19/12 Not sampled due to the presence of SPO;oleophilic sock placed in well 03/18/13 Not sampled due to the presence of SPO;oleophilic sock placed in well 03/28/14 '�Not sampled due to the presence of SPO. MW-6 lWell not sampled due to the presence of SPO 04/25/96 <500 NA <500 <0.2 <0.2 <0.3 <0.4 04/02/97 NS NS NS NS NS NS NS 07/08/97 NA <50 <50 <0.5 <0.5 <0.5 <2 I 10/07/97 NA <50 80 <0.5 <0.5 <0.5 <2 10/07/97 D NA <50 80 <0.5 <0.5 <0.5 <2 01/30/98 NA <50 <50 <0.5 <0.5 <0.5 <1.5 MW-7 <0.5 <0.5 <0.5 <1.5 01/30/98 D NA <50 60 07/20/00 320 54 <50 <0.5 <0.5 <0.5 <0.5 10/17/00 510 <50 <50 <0.5 <0.5 <0.5 <0.5 01/23/01 NS NS NS NS NS NS NS I 05/30/01 NS NS NS NS NS NS NS 04/23/02 200 <50 <50 <0.5 <0.5 <0.5 <0.5 '00' leidos I Page 3 of 10 I