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GEOMATRIX <br /> Mr. Robert Mihalovich <br /> Chevron Environmental Management Company <br /> April 3, 2002 <br /> Page 6 <br /> analyses both with and without a silica gel preparation procedure prior to analysis using EPA <br /> Method 3630 Modified. <br /> DATA EVALUATION AND REPORT PREPARATION <br /> Upon completion of field activities and receipt of laboratory results, Geomatrix will prepare a <br /> report documenting field activities and analytical results for submittal to ChevronTexaco. The <br /> report will include a screening level HRA evaluating potential future residential use of the prop- <br /> erty. <br /> Please call either of the undersigned at (510) 663-4100 if you have any questions. <br /> Sincerely, <br /> GEOMATRIX CONSULTANTS, INC. <br /> Todd N. Loar dor Marti B. Bloes <br /> Staff Geologist Seni Scientist <br /> TNUMBB/PP <br /> L\Doc Safe\5000s\5011.001Wemalis WP.doc <br /> Attachments: <br /> Table 1 Historical Soil Analytical Results — 1995 Investigation <br /> Table 2 Historical Soil Analytical Results: Total Petroleum Hydrocarbons and <br /> Related Constituents— 1998 Investigation <br /> Table 3 Historical Soil Analytical Results: Polynuclear Aromatic Hydrocarbons — <br /> 1998 Investigation <br /> Table 4 Historical Groundwater Analytical Results — 1998 Investigation <br /> Figure 1 Site Location Map <br /> Figure 2 Site Plan and Historical Boring and Monitoring Well Locations <br /> Figure 3 Groundwater Analytical Results and Potentiometric Surface <br /> Figure 4 Proposed Boring Locations <br /> Appendix A Boring Logs <br />