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TABLE 2 <br /> SUMMARY OF SOIL ANALYTICAL RESULTS(TPHc and BTEX) 1'2'3 <br /> MOUNTAIN HOUSE DEVELOPMENT SITE#6 <br /> Mountain House,San Joaquin County,California <br /> Concentrations in mg/kg <br /> Sample <br /> DepthDate Ethyl- Total <br /> Boring ID (feet bgs) Sampled TPHc Benzene Toluene benzene Xylenes <br /> SCREENING PRG --- 0.002 4 0.6 4 10 4 <br /> LEVELS 3 0.044 6 2.9 7 2.3 7 <br /> SB-26 5 3/31/2008 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> 13.5 3/31/2008 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> 5 4/1/2008 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> SB-27 9.5 4/1/2008 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> 21 4/1/2008 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> SB-28 5 4/1/2008 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> 9 4/1/2008 <4.0 <0.0005 <0.0009 <0.0009 <0.0009 <br /> SB-29 5 4/1/2008 <4.0 <0.0005 <0.001 <0.001 <0.001 <br /> 9 4/1/2008 <4.0 <0.0005 <0.0009 <0.0009 <0.0009 <br /> Abbreviations: <br /> <=Denotes analyte not detected at or above the laboratory reporting limit <br /> bgs=Below ground surface <br /> BTEX=Benzene,toluene,ethylbenzene,and total xylene <br /> E=Estimated value based on surrogate recovery level <br /> EPA=U.S.Environmental Protection Agency <br /> ESL=Environmental Screening Leve <br /> ID=Identification <br /> J=Estimated concentration detected between MDL and LOC <br /> LOQ=Limit of Quantitation <br /> MDL=Method Detection Limii <br /> mg/kg=Milligrams per kilogran <br /> PRG=Preliminary Remediation Goa] <br /> RWQCB=Regional Water Quality Control Boarc <br /> SAIC=Science Applications International Corporatior <br /> TPHc=Total petroleum hydrocarbons quantified as crude oil <br /> Notes: <br /> 1. Samples were collected by SAIC and analyzed by Lancaster Laboratories,Inc.for TPHc using EPA Methoc <br /> 8015B modified(CIO-C36)and BTEX using EPA Method 8260B. <br /> 2. Results in bold exceed PRGs and/or ESLs. <br /> 3. See Appendix E.1 for data validation results, <br /> 4. PRG Soil Screening Level for the protection of groundwater(dilution attenuation factor of 1) <br /> 5. ESL Direct Exposure(Human Health) <br /> 6. 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 leve <br /> 7. ESL"Leaching to Groundwater"concentration in soil for the protection of groundwater(drinking water source) <br /> based on ceiling value. <br /> Sources: <br /> PRGs from EPA"Region 9 PRGs Table"(October 2004). <br /> ESLs from the San Francisco Bay RWQCB Screening for Environmental Concerns at Sites with Contaminated Soil and <br /> Groundwater (Interim Final November 2007[Revised May 2008]). <br /> = fly <br /> MMWFr>aff%�® <br /> Fmm Science to Soiufions <br /> Page 3 of 3 <br />