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TABLE 2 SUMMARY OF GROUNDWATER ANALYTICAL RESULTS(TPH,BTEX,AND MTBE)1 US CAN-WELTY ROAD Vernalis,California Concentrations reported in gg/L Date Ethyl- Total Sample ID Collected TPHd TPHdsg TPHg TPHmo Benzene Toluene benzene Xylenes MTBE SCREENING WQO 100 2 100 2 5 2 0.15 3 42 2 292 17 2 5° LEVELS ESL 100 5 100 5 100 5 1 6 40 5 30 5 20 5 5 5 WFSMW-115 01/23/07 3901Q11 <50 NA NA NA NA NA NA NA (cont.) 04/30/07 63010 <50NA NA NA NA NA NA NA 08/07/0712 NS NS NS NS NS NS NS NS NS Monitoring discontinued on 08/21/07 per RWQCB. Abbreviations: <=Analyte not detected at or above the laboratory reporting limit shown BTEX=Benzene,toluene,ethylbenzene,and total xylenes D=Duplicate sample DRO=Diesel-range organics E=Indicates the reported value is estimated due to associated QC results EPA=U.S.Environmental Protection Agency ESL=Environmental Screening Level GRO=Gasoline-range organics ID=Identification MCL=Maximum contaminant level MTBE=Methyl tertiary butyl ether NA=Not analyzed NS=Not sampled QC=Quality control RWQCB=Regional Water Quality Control Board SPO=Separate-phase oil SWRCB=State Water Resources Control Board TPH=Total petroleum hydrocarbons TPHd=TPH quantified as DRO without silica-gel preparation TPHdsg=TPHd with silica-gel preparation TPHg=TPH quantified as GRO TPHmo=TPH quantified as motor oil µg/L=Micrograms per liter WFS=Western Farm Service WQO=Water Quality Objective Notes: Values in bold exceeds either the WQO or ESL or both. *Starting with the second quarter 2006,laboratory analytical data are being qualified and flagged as appropriate. See the respective Data Usability Summary section of the reports for detailed information on the qualifiers used. L TPHd(C1O to C25)analyzed using EPA Method 8015M prior to third quarter 2006;starting with third quarter 2006,EPA Method 8015B used.TPHd with silica-gel preparation analyzed with EPA Method 8015M prior to third quarter 2006;starting with third quarter 2006,EPA Method 8015B used. TPHg (C6 to C12)analyzed using EPA Method 8015M prior to third quarter 2006;starting with third quarter 2006,EPA Method 8015B used. BTEX and MTBE analyzed using EPA Method 8021B. 2. WQO(Tastes and Odors)that prohibits adverse tastes and odors or nuisance conditions. 3. WQO(Toxicity)that prohibits toxic chemicals in toxic amounts. 4. WQO(Chemical Constituents)that requires compliance with California drinking water MCLS and generally prohibits adverse effects on beneficial uses. 5. ESL(for protection of current or potential drinking water resource)based on Ceiling Value. 6. ESL(for protection of current or potential drinking water resource)based on Drinking Water Toxicity.Primary MCL. 7. Not sampled due to the presence or historical presence of SPO. 8. Insufficient water in the well to sample. 9. TPHg and BTEX results are reported for the samples collected on February 14,2006.TPHd results are reported for the sample collected on March 30,2006. 10.The observed sample pattern includes#2 fuel/diesel and an additional pattern that elutes later in the DRO range. 11.DRO detected in the method blank.The blank value was not subtracted from the analytical result. 12.Well was not accessible. 13.Sample surrogate date was outside the QC limits.The hold time had expired prior to the reextraction so all results are reported from the original extract. 14.The duplicate sample was labeled differently on the chain-of-custody form. 15.Well located on WFS property. Sources: WQOs defined in San Francisco Bay Basin(Region 2)Water Quality Control Plan(Basin Plan) January 2007. WQOs may be stated in either numerical or narrative form Narrative WQOs are interpreted by values from SWRCB A Compilation of Water Quality Goals-July 2008. ESLs from the San Francisco Bay RWQCB Screening for Environmental Concerns at Sites with Contaminated Soil and Groundwater(Interim Final May 2008). SUE7. Page 3 of 3 � W Pram Sel to s ?A%