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TABLE 1 <br /> 'OF PRE-EXCAVATION INVESTIGATION SOIL ANALYTICAL RESULTS <br /> TRACY PUMP STATION <br /> Tracy,San Joaquin County,California <br /> ' Concentrations in m <br /> Sample <br /> Depth Date Ethyl- Total <br /> ' <br /> Boring ID (feet bgs) Sampled Benzene Toluene benzene Xylenes <br /> 5B-42 9.5 5/2512011 <0.0066 <0.0066 <0.0066 <0.0066 <br /> SB-43 9 5/25/2011 <0.0065 <0.0065 <0.0065 <0.0065 <br /> ' SB-44 3 5/26/2011 <0.0063 <0.0063 <0.0063 <0.0063 <br /> 4 5/26/2011 <0,0065 <0.0065 <0.0065 <0.0065 <br /> SB45 6 5/26/2011 <0.880 <0.880 0.048 J 0.159 J <br /> ' 9 5/26/2011 <0.0064 <0.0064 <0.0064 1 <0.0064 <br /> SB46 5 5/26/2011 <0.0065 <0.0065 <0.0065 <0.0065 <br /> SB-47 3 5/26/2011 <0.0060 <0.0060 <0,0060 <0.0060 <br /> ' SB-48 5 5/26/2011 <0.0062 <0.0062 <0.0062 <0.0062 <br /> SB-49 3 1 526/2011 1 <0.0062 1 <0.0062 <0.0062 <0.0062 <br /> Abbreviations: <br /> ' bgs=Below ground surface <br /> BTEX=Benzene,toluene,ethylbenzene,and total xylenes <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=SAIC Energy,Emirrnrment 8t Wirastructme,LLC <br /> <=Denotes analyte not detected at or above the laboratory LOQ <br /> Notes. <br /> ' 1. Samples were collected by SAIC and analyzed by Calscience Environmental Laboratories,Inc. <br /> BTEX using EPA Method 8260B- <br /> 2. Results in bold exceed RSLs andtor ESLs. <br /> ' 3. See Appendix D for data validation results. <br /> 4. Risk-based screening Ievel for protection of groundwater. <br /> 5. MCL-based screening level for protection of groundwater. <br /> 6. ESL"Leaching to Groundwater"concenttation in soil for the protection of groundwater <br /> ' (drinking water source),based on ceiling value. <br /> 7. ESL Direct Exposure(Human Health) <br /> 8. ESL"Leaching to Groundwater"concentration in soil for the protection of groundwater <br /> (drinking water source),based on concentration modeled to leach to groundwater at or above the <br /> ' health-based screening level. <br /> Sources: <br /> RSLs from EPA Regional Screening Le vis for Chemical Contaminants at Superftrnd Sites, <br /> September 2008. <br /> ESLs from the San Francisco Bay RWQCB Screening for Environmental Concerns at Sites with <br /> Contaminated Sail and Groundwater(Interim Final May 2008). <br /> Page 2 of 2 SAIE <br />