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GEOMATR X <br /> Mr. Robert Mihalovich , <br /> Chevron Environmental Management Company <br /> July 12, 2001 <br /> Page 7 <br /> RWQCB approves the decommissioning of these two wells in 2001 in accordance with San <br /> Joaquin County and State of California requirements. <br /> We look forward to working with the RWQCB towards obtaining final resolution on this site. <br /> Please call either of the undersigned if you have questions. <br /> Sincerely yours, <br /> GEOMATRIX CONSULTANTS, INC. <br /> I <br /> Veen Chee Foong, PE M in B. Bloes <br /> Senior Engineer Se 'or Scientist <br /> VCF/MBB/pp <br /> I:\Doc_Safe\2000s\C2463\corralhollowresp 6nal.doc <br /> Attachments: Figure 1 Groundwater Elevations and BTEX Concentrations in Selected <br /> Wells I <br /> Figure 2 Declining Benzene Concentrations in Groundwater <br /> Figure 3 Groundwater Elevations and Analytical Results—May 2001 <br /> Groundwater Monitoring <br /> Table 1 Alternative 3: ORC (3 Change Outs per Year) <br /> Table 2 Alternative 3: ORC (1 Change Out per Year) <br /> Table 3 Conceptual ORC Pilot Study Cost Estimate <br /> I <br /> Appendix A ORC Replacement Calculations <br /> Appendix B Hydraulic Parameters at the Site <br /> i <br /> i <br /> I <br /> i <br /> II <br /> i <br /> I <br /> I <br />