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TABLE 1 <br /> SUMMARY OF SOIL ANALYTICAL RESULTS(TPHc and BTEX)t,z <br /> MOUNTAIN HOUSE DEVELOPMENT SITE#6 <br /> Mountain House,San Joaquin County,California <br /> Concentrations in mg/kg <br /> Sample <br /> Depth Date Ethyl- Total <br /> Boring ID (feet bgs) Sampled TPHc Benzene Toluene benzene Xylenes <br /> SB-37 5 11/11/09 <4.0 <0.0005 <0.0009 <0.0009 <0.0009 <br /> 13 11/11/09 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> SB-38 5 11/12/09 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> 13 11/12/09 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> 5 11/17/09 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> SB-39 20 11/17/09 6,900 <0.025 0.054 J 0.051 J 0.13 J <br /> 26 11/17/09 5.3 J <0.0005 <0.001 <0.001 <0.001 <br /> SB-40 5 11/17/09 93 <0.0005 <0.0009 <0.0009 <0.0009 <br /> 23 11/17/09 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> 5 11/16/09 4.7 J <0.0005 <0.001 <0.001 <0.001 <br /> SB-41 18 11/16/09 12 <0.0005 <0.001 <0.001 <0.001 <br /> 22 11/16/09 230 <0.0005 <0.001 <0.001 <0.001 <br /> 29 11/16/09 4.2 J <0.0005 <0.001 <0.001 <0.001 <br /> 5 11/16/09 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> SB-42 26 11/16/09 15 <0.0005 <0.001 <0.001 <0.001 <br /> 35 11/16/09 4.6 J <0.0005 <0.001 <0.001 <0.001 <br /> SB-43 22 11/12/09 1,200 <0.0005 <0.0009 <0.0009 <0.0009 <br /> 29 11/12/09 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> SB-44 5 11/18/09 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> 22 11/18/09 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> Abbreviations: <br /> bgs=Below ground surface <br /> BTEX=Benzene,toluene,ethylbenzene,and total xylenes <br /> D=Duplicate Sample <br /> E=Estimated value based on surrogate recovery levels <br /> EPA=United States 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 Levels <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 /> ---=Not available <br /> Notes: <br /> 1. Samples were collected by SAIC and analyzed by Lancaster Laboratories,Inc.for TPHc using EPA Method <br /> 8015B modified(CLQ-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 usability summary. <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 <br /> and Groundwater(Interim Final May 2008). <br /> 94-. <br /> Fmm Scierrca to 5vluNans <br /> Page 3 of 3 <br />