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N ' <br /> /9� <br /> GEOMATRIX <br /> Mr. M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> September 29, 2003 <br /> Page 2 <br /> 3. Historical aerial photographs of the properties have been requested from various <br /> sources by Geomatrix. These photographs will be reviewed to identify areas of <br /> potential environmental concerns that may be related to the operations of the <br /> former pump station. Other features not related to the former pump station that <br /> may influence the site evaluation will also be identified. <br /> 4. Based on the results of the first three tasks, a work plan for a preliminary soil and <br /> groundwater investigation at the Arcos property will be prepared for <br /> ChevronTexaco's submittal to the RWQCB in accordance with ChevronTexaco's <br /> Consistent Technical Approach I. <br /> 5. The field sampling activities for the preliminary soil and groundwater investigation <br /> at the Arcos property have been tentatively scheduled for the last week of October <br /> 2003. <br /> 6. After completion of the preliminary soil and groundwater investigation at the <br /> Arcos property and receipt of analytical results from the laboratory, a report will be <br /> prepared for ChevronTexaco's submittal to the RWQCB. It is anticipated the <br /> report will be available 60 days after the receipt of data. <br /> Because both the Bellini and Arcos properties were part of the former Vernalis Pump Station, <br /> we propose to combine in one report the results of the recently completed investigation at the <br /> Bellini property with the proposed investigation at the Arcos property. We anticipate a final <br /> report can be prepared for ChevronTexaco's submittal to the RWQCB by end of this year, if <br /> there are no project delays due to contractor's availability or weather. We recommend that <br /> ChevronTexaco request an extension from the RWQCB for the submittal of the investigation <br /> report for the Bellini property. <br /> Sincerely yours, <br /> GEOMATRIX CONSULTANTS, INC. <br /> Veen Chee Foo7-1 P.E. <br /> Senior Engineer <br /> t SECOND DRAFT Revised Technical Approach to Site Evaluation and Decision-Making,Old Valley Pipeline <br /> Sites,Central Valley Region,prepared by Geomatrix on behalf of ChevronTexaco,December 2002. <br /> I:\PROJECTl5000s15011.000\Roberts rpt extension request.doc <br />