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TABLE 2 GROUNDWATER CHEMICAL ANALYTICAL RESULTS(TPH,BTEX,AND MTBEJl US CAN-WELTY ROAD Vernalis, California Concentrations reported inµg2 Date Ethyl- Total Sample ID Collected TPHd TPHdsg TPHg TPHmo Benzene Toluene benzene Xylenes MTBE SCREENING WQO MMqW,002 IV 100 2 5 2 42 2 29 17 2 5 2'4 LEVELS ESL 1001 1001 100 5,6 40 5'' 30 5'' 20 5,' 5 5,6 WFSMW-115 04/30/07 630 " <50 NA NA NA NA NA NA NA (cont.) 8/7/200713 NS NS NS NS NS NS NS NS NS Sampling discontinued on 8/21/2007 per California Regional Water Quality Control Board request. Abbreviations: Notes:(cont.) <=Analyte not detected at or above the laboratory reporting limit shown 1. TPHd(C11 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 (C 6 to C12)by EPA Method 8015M prior to third DRO=Diesel-range organics quarter 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 GRO=Gasoline-range organics prohibits adverse effects on beneficial uses. ID=Identification 5. ESL for groundwater protection(drinking water source),based on"Ceiling Level(Nuisance/Aesthetic Concerns)." MCL=Maximum contaminant level 6. ESL in groundwater for human health protection,based on direct contact exposure pathways and the California MTBE=Methyl tertiary butyl ether Primary MCL. MW=Monitoring well 7. ESL in surface water for the protection of human health. NA=Not analyzed 8. Not sampled due to the presence of SPO. NS=Not sampled 9. Insufficient water in the well to sample. RWQCB=Regional Water Quality Control Board 10.TPHg and BTEX results are reported for the samples collected on February 14,2006. TPHd results are SPO=Separate-phase oil reported for the sample collected on March 30,2006. TPH=Total petroleum hydrocarbons 11.The observed sample pattern includes#2 fuel/diesel and an additional pattern that elutes later in the DRO range. TPHd=TPH quantified as DRO without silica-gel preparation 12.DRO were detected in the method blank.The blank value was not subtracted from the analytical result. TPHdsg=TPHd with silica-gel preparation 13.Well was not accessible. TPHg=TPH quantified as GRO 14.The duplicate sample was labeled differently on the chain-of-custody form. TPHmo=TPH quantified as motor oil 15.Well located on Western Farm Service Property. gg/L=Micrograms per liter 16.The observed sample pattern includes#2 fuel/diesel,an additional pattern that elutes later in the DRO range WFSMW=Western Farm Service monitoring well and individual peaks eluting in the DRO range. WQO=Water Quality Objective Sources: Notes: ESLs from Screening for Environmental Concerns at Sites with Contaminated Soil and Groundwater (February2005). Values in Bold exceeds either the WQO or ESL or both. (Interim Final),San Francisco Bay RWQCB *Starting with the second quarter 2006,laboratory analytical data are being qualified and WQOs from Water Quality Control Plan(Basin Plan)for the Sacramento River Basin and the San Joaquin Rive r flagged as appropriate. Please see the respective Data Usability Summary section of the Basin,4th ed.(revised August 2006). reports for detailed information on the qualifiers used. =si i ON MMEFJW%t`® Page 4 of 4 FmmScience fOSe7dWs