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TABLE 3 <br /> GROUNDWATER CHEMICAL ANALYTICAL RESULTS—PAHs' <br /> US CAN-WELTY ROAD <br /> Vernalis, California <br /> Concentrations reported in itg/L <br /> Abbreviations: <br /> <=Analyte not detected at or above the laboratory reporting limit shown <br /> D=Duplicate sample <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 MDL and LOQ <br /> LOQ=Limit of qualification <br /> MCL=Maximum contaminant level <br /> MDL=Method detection limit <br /> MW=Monitoring well <br /> ND=Not detected at or above the laboratory reporting limit <br /> NS=Not sampled <br /> PAHs=Polynuclear aromatic hydrocarbons <br /> RWQCB=Regional Water Quality Control Board <br /> SIM=Selective ion monitoring <br /> SPO=Separate-phase oil <br /> µg/L=Micrograms per liter <br /> WFSMW=Western Farm Service monitoring well <br /> WQO=Water Quality Objective <br /> Notes: <br /> Values in Bold exceeds either the WQO or ESL or both. <br /> *Starting with the second quarter 2006,laboratory analytical data are being qualified and flagged as appropriate. Please see the respective Data Usability Summary section of the reports for detailed information on the qualifiers used. <br /> 1. PAHs were analyzed by Lancaster Laboratories,Inc.using EPA Method 8270C SIM. <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 in groundwater for the protection of ecological receptors. <br /> 6. ESL in surface water for protection of human health. <br /> 7. ESL in surface water for protection of ecological receptors. <br /> 8. ESL in groundwater for human health protection,based on direct contact exposue pathways and the California Primary MCL. <br /> 9. Not sampled due to the presence of SPO. <br /> 10. Insufficient water volume in the well to sample. <br /> 11. PAH results are reported for the sample collected on March 30,2006. <br /> 12. Not accessible due to parked car. <br /> 13. The duplicate sample was labeled differently on the chain-of-custody form. <br /> 14. Well located on Western Farm Service Property. <br /> Sources: <br /> ESLs from"Screening for Environmental Concerns at Sites with Contaminated Soil and Groundwater"(Interim Final),San Francisco Bay RWQCB(February 2005).Most conservative levels are used. <br /> WQOs from"Water Quality Control Plan(Basin Plan)for the Sacramento River Basin and the San Joaquin River Basin,"4th ed.(WQOs used are the most conservative outlined in the letter from RWQCB dated April 16,2004-Appendix A- <br /> Reports Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites). <br /> Page 3 of 3 From Science to SoNlims <br />