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GEO MATRIX <br /> Ms. Katie Hower <br /> Chevron Pipe Line Company <br /> 19 MarcTi 1 007 <br /> Page 5 <br /> previous experience, Old Valley Pipeline sites are typically a hybrid between a vadose zone case <br /> and a groundwater case as defined in the RWQCB criteria because the petroleum has reached the <br /> water table, but groundwater is minimally impacted by dissolved constituents (if at all). Because <br /> Old Valley Pipeline "soil-only"cases will be handled by the County (see Step 2), cases handled by <br /> RWQCB will be defined as "groundwater" cases. Closure request documentation will conform, as <br /> applicable, to Appendix B of the Tri-Regional Guidelines (RWQCB, 1994). Ultimately, the age <br /> of the release(s), the weathered nature of the petroleum, and steady-state conditions at these sites <br /> will allow for decisions based on site data to be made with a high degree of confidence. <br /> We appreciate the opportunity to continue to provide our environmental consulting services to <br /> Chevron Pipe Line Company. Please call me if you have any questions about this approach. <br /> Sincerely yours, <br /> GEOMATRIX CONSULTANTS, INC. <br /> Dawn A. oydrogeolog* <br /> Principalt <br /> DAZtpp <br /> 1A WPDOCSU76110 V P•TASE.DOC <br /> Attachment: References <br /> Figures 1 and 2 <br />