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TABLE 1 SUMMARY OF SOIL ANALYTICAL RESULTS(TPHc and BTEX)' US CAN-WELTY ROAD Vernalis,San Joaquin County,California Concentrations in mg/kg Sample Depth Date Ethyl- Total Boring ID (feet bgs) Sampled TPHc Benzene Toluene benzene Xylenes SCREENING RSL -- 0.00023 4 0.76 5 0.0019 4 0.23 4 LEVELS ESL 3706 0.044 7 2.9 8 2.3 s 2.3 a SB-44 5 7/20/2010 <4.0 <0.0005 <0.0009 <0.0009 <0.0009 SB-44 36 7/20/2010 <4.0 <0.0005 <0.001 <0.001 <0.001 SB-45 5 7/20/2010 10 J <0.0005 <0.00l <0.001 <0.001 SB-45 38 7/22/2010 <4.0 <0.0005 <0.0009 <0.0009 <0.0009 SB-46 5 7/21/2010 <4.0 <0.0005 <0.0009 <0.0009 <0.0009 SB-46 38 7/21/2010 <4.0 <0.0005 <0.001 <0.001 <0.001 SB-46 44.5 7/21/2010 <4.0 <0.0005 <0.0009 <0.0009 <0.0009 SB-47 5 7/21/2010 <4.0 <0.0005 <0.0009 <0.0009 <0.0009 SB-47 1 34.5 1 7/21/2010 <4.0 <0.0005 1 <0.001 <0.001 <0.001 Abbreviations: bgs=Below ground surface BTEX=Benzene,toluene,ethylbenzene,and total xylenes EPA=United States Environmental Protection Agency ESL=Environmental Screening Level ID=Identification J=Estimated concentration detected between MDL and LOQ LOQ=Limit of Quantitation MCL=Maximum Contaminant Levels MDL=Method Detection Limit mg/kg=Milligrams per kilogram RSL=Regional Screening Level RWQCB=Regional Water Quality Control Board SAIC-Benham=The Benham Companies,LLC,an SAIC Company TPHc=Total petroleum hydrocarbons quantified as crude oil <=Denotes analyte not detected at or above the laboratory reporting limit --Not available Notes: 1. Samples were collected by SAIC-Benham and analyzed by Lancaster Laboratories,Inc.for TPHc using EPA Method 8015B modified(C 10-C36)and BTEX using EPA Method 8260B. 2. Results in bold exceed RSLs and/or ESLs. 3. See Appendix F for data validation results. 4. Risk-based screening level for protection of groundwater. 5. MCL-based screening level for protection of groundwater. 6. ESL Direct Exposure(Human Health) 7. ESL"Leaching to Groundwater"concentration in soil for the protection of groundwater(drinking water source), based on concentration modeled to leach to groundwater at or above the health-based screening level. 8. ESL"Leaching to Groundwater"concentration in soil for the protection of groundwater(drinking water source), based on ceiling value. Sources: RSLs from EPA Regional Screening Levels(RSL)for Chemical Contaminants at Superfund Sites ,September 2008. ESLs from the San Francisco Bay RWQCB Screening for Environmental Concerns at Sites with Contaminated Soil and Groundwater (Interim Final),May 2008. The Bonham Companies,LLC nwhony0.MSu6,idary Page] of 1 F,",„s