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ConocoPhillips 2705445 SECOR January 15, 2007 Page 3 Laboratory analytical data for groundwater samples collected during this investigation indicate the following: • The highest concentrations of GRO (6,000 ug/L)and BTEX (150 ug/L, 970 ug/L, 200 ug/L and 1,000 ug/L)were reported for the B-7 groundwater sample. The highest concentrations of MTBE and TBA were detected in the groundwater sample collected from B-11 at 60,000 ug/L and 7,700 ug/L, respectively. QA/QC Method blank for DRO analysis on samples B-7@55'contained a target compounds above the reporting limit. The sample contained greater than 10X the value found in the method blank; therefore, re-extraction and or re-analysis of the sample was not performed. Method blanks for DRO analysis on samples B-9@50', B-8@50', B-10@35,' B-1 0@50', B- 7@20',and B-1 @55', contained a target compounds above the reporting limit. None of the samples associated with the method blank contained the target compound; therefore, re- extraction and or re-analysis of the sample was not performed. Surrogate recoveries were not reported for sample B-7@20' due to required dilution. Waste Removal Soil cuttings and decontamination rinsate water generated during the site assessment activities were stored in Department of Transportation (DOT)approved 55-gallon capacity steel drums. The drums were staged onsite pending laboratory characterization as non-hazardous waste. Filter Recycling Services (FRS) of Colton, California transported the drums to their licensed facility in Rialto, California for disposal on February 3,2007. Waste disposal details will be submitted under a separate cover on a later date. Limitations This site assessment report has been prepared for the exclusive use of ConocoPhillips and its representatives as it pertains to the property located at 1206 E. March Lane, Stockton, California. Evaluations of the geologic conditions at the site for the purposes of this investigation are inherently limited due to the number of observation points. There are no representations, warranties, or guarantees that the points selected for sampling are representative of the entire site. Data from this report reflects the conditions at specific locations at a specific point in time. No other interpretation, representations,warranties, guarantees, express or implied, are included or intended in the report findings. SECOR assumes no responsibility for exploratory borings or data provided or reported by other consultants or contractors. hConocoPhillips\Due Diligence\2705445\report\2705445 Due Diligence report.doc