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' TABLE 2 <br /> GROUNDWATER ANALYTICAL RESULTS(TPH and BTEX)""j <br /> ' ALDEN PARK <br /> Tracy,California <br /> Concentrations reported in pg/L <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. TPH9 (C6 to q2)by EPA Method 8015M used prior to third quarter 2006, <br /> starting with third quarter 2006,EPA Method 80158 used. BTEX were analyzed using EPA Method 8021B. <br /> 2. Results in bold exceed WQOs and/or ESLs. <br /> 3. See Appendix C for data usability summary. <br /> ' 4. WQO(Tastes Bud Odors)that prohibits adverse tastes and odors or nuisance conditions. <br /> 5. WQO(Toxicity)that prohibits toxic chemicals in toxic amounts. <br /> 6. ESL(for protection or current or potential drinking water resource)based on Ceiling Value, <br /> ' 7. ESL(for protection or current or potential drinking water resource)based on Drinking Water Toxicity. <br /> 8. Detection limits were raised due to dilution. The sample was diluted due to matrix effect(foamy). <br /> 9. Results after a second silica gel-preparation procedure. <br /> ' Sources: <br /> ESLs from San Francisco Bay RWQCB Screening for Environmental Cancer=at Sites with Contaminated Sail and Groundwater <br /> (Interim Final), May 2008. <br /> WQOs defined in the Central Valley RWQCB Water Quality Control Plan(Basin Plan)for the Sacramento River Basin and San Joaquin River Basin <br /> (Fourth Edition),October 2007. <br /> WQOs may be stated in either numerical or narrative form. Narrative water quality objectives are interpreted by values from S WRCBA Compilation of <br /> Water Quality Goals-July 2008. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> ' j�A ieeee The Benham Companley LLC <br /> Page 10 of 10 roan s��a�e rusowmrs <br />