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TABLE 2 <br /> GROUNDWATER ANALYTICAL RESULTS(TPH and BTEX)t <br /> ALDEN PARK <br /> Tracy,California <br /> Concentrations reported inµg/L <br /> Date Ethyl- Total <br /> Well ED Sampled TPHd TPHdsg TP Benzene Toluene benzene Xylenes <br /> SCREENING WQO 1001 100 2 5 2 0.15 3 42 2 292 17 2 <br /> LEVELS ESL 100 5 1001 100 , 1 6 40 5 30 5 20 s <br /> MW-21 08/27/03 Not sampled due to the presence of SPO/sheen <br /> (cont.) 02/1.8/04 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 INot 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=U.S.Environmental Protection Agency <br /> ESL=Environmental Screening Level <br /> ID=Identification <br /> J=Indicates the reported value is an estimated concentration detected between the method detection limit and limit of quantitation <br /> gg/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 /> TPHd=Total petroleum hydrocarbons quantified as diesel-range organics(CIO-C25) <br /> TPHdsg=TPHd with silica gel-cleanup procedure <br /> TPHg=Total petroleum hydrocarbons quantified as gasoline-range organics(C6-C12) <br /> WQO=Water Quality Objective <br /> Page 15 of 16 From Science to Solutions <br />