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TABLE 1 <br /> SUMMARY OF SOIL ANALYTICAL RESULTS (TPHc and BTEX) <br /> US CAN-WELTY ROAD <br /> ' Vernalis, San Joaquin County, California <br /> Concentrations in mg/kg <br /> Depth Date Etbyl- Total <br /> Boring ID (feet bgs) I Sampled TPHc Benzene Toluene benzene Xylenes <br /> SCREENING RSL 0.00023 4 0.76 5 0.0019 4 0.23 4 <br /> LEVELS ESL 370 6 0.044 7 2.9 8 2.3 s 2.3 s <br /> SB-34 5 11/17/2008 19 <0.0005 <0.001 <0.001 <0.001 <br /> 43.5 11/20/2008 4,800 <0.023 <0.046 <0.046 <0.046 <br /> SB-35 5 11/17/2008 5.4 J <0.0005 <0.001 <0.001 <0.001 <br /> 41.5 11/24/2008 6.7 J <0.0005 <0.001 <0.001 <0.001 <br /> SB-36 5 11/17/2008 4.0 J <0.0005 <0.0009 <0.0009 <0.0009 <br /> 38 11/24/2008 <4.0 <0.0005 <0.001 <0.001 I <0.001 <br /> ' SB-37 42 11/20/2008 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> SB-38 42.5 11/25/2008 <4.0 <0.0005 E <0.001 E <0.001 E <0.001 E <br /> SB-39 39 11/25/2008 <4.0 <0.0005 <0.001 I <0.001 <0.001 <br /> SB-40 5 3/4/2009 4.2 J <0.0005 <0.001 <0.001 <0.001 <br /> 43.5 3/4/2009 4.6 J <0.0005 <0.001 <0.001 <0.001 <br /> SB-41 5 3/4/2009 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> ' 42 3/4/2009 5.7 J <0.0005 <0.001 <0.001 <0.001 <br /> SB-42 5 3/3/2009 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> 29.5 3/5/2009 4.5 J <0.0005 <0.001 <0.001 I <0.001 <br /> SB-43 5 3/4/2009 43 J <0.0005 <0.001 <0.001 <0.001 <br /> 29 3/5/2009 4.3 J <0.0005 <0.001 <0.001 <0.001 <br /> Abbreviations: <br /> bgs=Below ground surface <br /> ' BTEX=Benzene,toluene,ethylbenzene,and total xylenes <br /> E=Estimated value based on surrogate recovery levels <br /> EPA=U.S.Environmental Protection Agency <br /> ESL=Environmental Screening Level <br /> ' ID=Identification <br /> J=Estimated concentration detected between MDL and LOQ <br /> LOQ=Limit of Quantitation <br /> MCL=Maximum Contaminant Level <br /> MDL=Method Detection Limit <br /> mg/kg=Milligrams per kilogram <br /> RSL=Regional Screening Level <br /> ' RWQCB=Regional Water Quality Control Board <br /> SAIC=Science Applications International Corporation <br /> TPHc=Total petroleum hydrocarbons quantified as crude oil <br /> <=Denotes analyte not detected at or above the laboratory reporting limit <br /> Notes: <br /> 1. Samples were collected by SAIC and analyzed by Lancaster Laboratories,Inc.for TPHc using EPA Method <br /> 8015B modified(CIO-C36)and BTEX using EPA Method 8260B. <br /> 2. Results in bold exceed RSLs and/or ESLs. <br /> 3. See Appendix E.1 for data validation results. <br /> 4. Risk-based screening level for protection of groundwater. <br /> 5. MCL-based screening level for protection of groundwater. <br /> 6. ESL Direct Exposure(Human Health). <br /> 7. ESL"Leaching to Groundwater"concentration in soil for the protection of groundwater(drinking water source), <br /> based on concentration modeled to leach to groundwater at or above the health-based screening level. <br /> 8. ESL"Leaching to Groundwater"concentration in soil for the protection of groundwater(drinking water source), <br /> ' based on ceiling value. <br /> Sources: <br /> RSLs from EPA Regional Screening Levels(RSL)for Chemical Contaminants at Superfund Sites,September 2008. <br /> ESLs from the San Francisco Bay RWQCB Screening for Environmental Concerns at Sites with Contaminated Soil and <br /> ' Groundwater (Interim Final May 2008). - - -- <br /> ori C C1 <br /> Page 2 of 2 From science to Solutlons <br />