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TABLE 2 <br /> GROUNDWATER ANALYTICAL RESULTS(TPH and BTEX)t <br /> ALDEN PARK <br /> Tracy,California <br /> Concentrations reported inµg2 <br /> Notes: <br /> Values in bold exceed the WQO or ESL or both. <br /> 1. TPHd(CIO to C25)by EPA Method 8015M used prior to third quarter 2006;starting with third quarter 2006, <br /> EPA Method 8015B used.TPHd with silica-gel preparation,EPA Method 8015 M used prior to third quarter 2006; <br /> starting with third quarter 2006. TPHg (C6 to C12)by EPA Method 8015M used prior to third quarter 2006, <br /> starting with third quarter 2006,EPA Method 8015B used. BTEX were analyzed using EPA Method 8021B. <br /> 2. WQO(Tastes and Odors)that prohibits adverse tastes and odors or nuisance conditions. <br /> 3. WQO(Toxicity)that prohibits toxic chemicals in toxic amounts. <br /> 4 ESL for groundwater protection(drinking water source),based on"Ceiling Level(Nuisance/Aesthetic Concerns)." <br /> 5. ESL for groundwater protection(drinking water source),based on"Ceiling Level(Nuisance/Aesthetic Concerns)." <br /> 6. ESL in groundwater for human health protection,based on direct contact exposure pathways and the California Primary MCL. <br /> 7. Detection limits were raised due to dilution. The sample was diluted due to matrix effect(foamy). <br /> 8. Results after a second silica gel-preparation procedure. <br /> Sources: <br /> ESLs from San Francisco Bay RWQCB Screening for Environmental Concerns at Sites with Contaminated,Soil and Groundwater <br /> (Interim Final May 2008). <br /> WQOs defined in San Francisco Bay Basin(Region 2)Water Quality Control Plan(Basin Plan) January 2007. <br /> WQOs may be stated in either numerical or narrative form. Narrative water quality objectives are interpreted by values <br /> from SWRCB A Compilation of Water Quality Goals-July 2008. <br /> Page 16 of 16 From Science to SaIVIVnS <br />