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' TABLE2 <br /> GROUNDWATER ANALYTICAL RESULTS(TPH and BTEX)t,z,a <br /> ' ALDEN PARK <br /> Tracy,California <br /> Concentrations reported in pg/L <br /> ' Date Ethyl- Total <br /> Well ID Sampled TPHd TPHdsg TPHg Benzene Toluene benzene Xylenes <br /> SCREENING WQO 1004 100 4 5 4 0.15 5 42 ^ 29 4 17 4 <br /> LEVELS ESL 1001 1006 1001 1 4 40 e 30 e 20 a <br /> MW-21 01/23/01 2,400 1,300 <250 <2.5 s <2.5 " Q.5 s Q.5 e <br /> (cont.) 05/30/01 830 110/110 N <250 <2.5 s <2.5 " <2.5 x <2.5 " <br /> 07/26/01 1,900 480 <250 Q.5 s <2.5 s Q.5 e <2.5 s <br /> 10/30/01 1,900 1,000/760 9 <250 <15 s <2.5 s <2.5 " <2.5 s <br /> 01/31/02 1,800 210/1509 <250 Q.5 s Q.5 s <2.5 s <2.5 s <br /> 01/31/02 (F) 1,500 150/<50 9 NA NA NA NA NA <br /> 04/23/02 2,100 540/4509 <500 x <5 s <5 s <5 s <5 1 <br /> 07/24/02 2,400 270/230 v <250 s <2.5 s <2.5 e Q.5 s <2.5 s <br /> 11/25/02 2,100 780/590 9 <250 s <2.5 s <2.5 s <2.5 " <2.5 s <br /> 03/11/02 2,000 1 260/260 9 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 Not sampled due to the presence of SPO;oleophilic sock placed in well <br /> ' 08/01/06 Not sampled due to the presence of SPO;oleophilic sock placed in well <br /> 01/29/07 Not sampled due to the presence of SPO;oleophilic sock placed in well <br /> 02/01/08 Not sampled due to the presence of SPO;oleophilic sock placed in well <br /> 01/15/09 Not sampled due to the presence of SPO; oleophilic sock placed in well <br /> 01/07/10 Not sampled due to the presence of SPO;oleophilic sock placed in well <br /> Abbreviations: <br /> ' (F)=Results for analysis of filtered sample <br /> D=Duplicate sample <br /> E=Indicates the reported value is estimated due to associated quality control results <br /> ' EPA=United States Environmental Protection Agency <br /> ESL=Environmental Screening Level <br /> ID=Identification <br /> I=Indicates the reported value is an estimated concentration detected between the method detection limit and limit of quantitation <br /> ' ag l- Micrograms per liter <br /> MCL=Maximum Contaminant Level <br /> MW=Monitoring well <br /> NA=Not analzyed. <br /> ' ND=Not detected at or above laboratory detection limit <br /> NS=Not sampled <br /> RWQCB=Regional Water Quality Control Board <br /> SPO=Separate-phase oil <br /> ' SWRCB=State Water Resources Control Board <br /> TPHd=Total petroleum hydrocarbons quantified as diesel-range organics(C,,,-C,,) <br /> TPHdsg=TPHd with silica gel-cleanup procedure <br /> TPH,=Total petroleum hydrocarbons quantified as gasoline-range organics(C6-C,2) <br /> ' WOO=Water Quality Objective <br /> ' + eam1 The Benham Companies LLC <br /> j RWM1aIIy Ownad 5uMW4ry <br /> Page 901 10 from5cence la SdnGorrs <br />