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TABLE 2 GROUNDWATER CHEMICAL ANALYTICAL RESULTS-TPH,BTEX,AND MTBEI US CAN-WELTY ROAD Vernalis,California Concentrations reported in pg/L Date Ethyl- Total Sample ID Collected TPHd TPHdsg TPHg TPHmo Benzene Toluene benzene Xylenes MTBE SCREENING WQO 100 2 100 0.15 3 42 2 29 2 17 2 LEVELS ESL 100 5 J 100 5 1 5,6 40 5'' 30 5,7 20 5,7 WFSMW-115 04/21/05 71 NA <50 NA <0.1 <1 <1 <1 NA (cont.) 07/27/05 170 <50 <50 NA <0.5 <0.5 <0.5 <0.5 NA 10/18/05 240 94 <50 NA <0.5 <0.5 <0.5 <0.5 NA 02/14/06 6611 <50 <50 NA <0.5 <0.5 <0.5 <1.5 NA 05/03/06 19016 <50 <50 NA <0.5 <0.5 <0.5 <1.5 NA 05/03/06D 16016 <50 <50 NA <0.5 <0.5 <0.5 <1.5 NA 08/16/06 230 11,12 E <50 <50 NA <0.5 <0.5 <0.5 <1.5 NA 08/16/06D 120 11,12 E <50 <50 NA <0.5 <0.5 <0.5 <1.5 NA 11/08/06 97011,12 <50 <50 NA <0.5 <0.5 <0.5 <1.5 NA 01/23/07 39011,12 <50 NA NA NA NA NA NA NA 04/30/07 63011 <50 NA NA NA NA NA NA NA Abbreviations: Notes:(cont.) <=Analyte not detected at or above the laboratory reporting limit show] 1. TPHd(CIO to C25)by EPA Method 8015M prior to third quarter 2006;starting with third quarter 2006, BTEX=Benzene,toluene,ethylbenzene,and total xylenes EPA Method 8015B used.TPHd with silica-gel preparation,EPA Method 8015 M used prior to third quarter 2006; D=Duplicate sample starting with third quarter 2006,EPA Method 8015B used. TPHg (C6 to C12)by EPA Method 8015M prior to third quarter DRO=Diesel-range organics 2006;starting with third quarter 2006,EPA Method 8015B used. BTEX were analyzed using EPA Method 8021B. E=Indicates the reported value is estimated due to associated quality control results 2. WQO(Tastes and Odors)that prohibits adverse tastes and odors or nuisance conditions. EPA=U.S.Environmental Protection Agency 3. WQO(Toxicity)that prohibits toxic chemicals in toxic amounts. ESL=Environmental Screening Level 4. WQO(Chemical Constituents)that requires compliance with California drinking water MCLS and generally ID=Identification prohibits adverse effects on beneficial uses. MCL=Maximum contaminant level 5. ESL for groundwater protection(drinking water source),based on"Ceiling Level(Nuisance/Aesthetic Concerns)." MTBE=Methyl tertiary butyl ether 6. ESL in groundwater for human health protection,based on direct contact exposure pathways and the California MW=Monitoring well Primary MCL. NA=Not analyzed 7. ESL in surface water for the protection of human health. NS=Not sampled 8. Not sampled due to the presence of SPO. RWQCB=Regional Water Quality Control Board 9. Insufficient water in the well to sample. SPO=Separate-phase oil 10.TPHg and BTEX results are reported for the samples collected on February 14,2006. TPHd results are TPH=Total petroleum hydrocarbons reported for the sample collected on March 30,2006. TPHd=TPH quantified as diesel-range organics without silica-gel preparation 11.The observed sample pattern includes#2 fuel/diesel and an additional pattern that elutes later in the DRO range. TPHdsg=TPHd with silica-gel preparation 12.DRO were detected in the method blank.The blank value was not subtracted from the analytical result. TPHg=TPH quantified as gasoline-range organics 13.Well was not accessible. TPHmo=TPH quantified as motor oil 14.The duplicate sample was labeled differently on the chain-of-custody form. gg/L=Micrograms per liter 15 Well located on Western Farm Service Property. WFSMW=Western Farm Service monitoring well 16.The observed sample pattern includes#2 fuel/diesel,an additional pattern that elutes later in the DRO range WQO=Water Quality Objective and individual peaks eluting in the DRO range. Notes: Sources: Values in Bold exceeds either the WQO or ESL or both. ESLs from"Screening for Environmental Concerns at Sites with Contaminated Soil and Groundwater"(Interim Final), *Starting with the second quarter 2006,laboratory analytical data are being qualified and San Francisco Bay RWQCB(February 2005).Most conservative levels are used. flagged as appropriate. Please see the respective Data Usability Summary section of the WQOs from"Water Quality Control Plan(Basin Plan)for the Sacramento River Basin and the San Joaquin River Basin,"4th ed. reports for detailed information on the qualifiers used. (WQOs used are the most conservative outlined in the letter from RWQCB dated April 16,2004-Appendix A-Reports Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites). =moi i ZZ ��✓f`s Frpm Science l0501!l71ppS Page 3 of 3