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GEOMATRIX <br /> Ms.Katie Hower <br /> Chevron Pipe Line Company <br /> 9 July 1998 <br /> Page 2 <br /> that provide useful perimeter data but have not contained detectable concentrations of PHCs <br /> for four consecutive quarters or more (MW-5 and MW-14). <br /> Wells to be abandoned include distal cross/down-gradient wells that have not contained detect- <br /> able concentrations of PHCs for 4 consecutive quarters or more(MW-3, MW-9, and MW-11). <br /> It is proposed that well MW-13 also be abandoned due to its close proximity to well MW-8, <br /> which will be monitored semi-annually. Wells MW-6 and MW-7 best monitor the interior of <br /> the PHC plume(i.e., these wells exhibit the highest and lowest PHC concentrations within the <br /> plume,respectively); well MW-12 is duplicative and is recommended for abandonment. <br /> Additionally, all groundwater/vapor extraction wells installed as part of CPL'S remedial efforts <br /> at the site (EX-1 through EX-12) are recommended for abandonment. <br /> It is anticipated that RWQCB approval will'be required prior to implementing well abandon- <br /> ment procedures or revising MRP 96-814. Please call either of the undersigned if you.need <br /> any additional information. <br /> Sincerely, <br /> GEOMATRIX CONSULTANTS,INC. <br /> M in B. Bloes Dawn A. Ze o, C.E. <br /> nior Scientist Principal H drogeolo "st <br /> NOaIDnz(pp <br /> 1:\Pmject\395&\W L\abdn.1tr.doc <br /> Enclosures <br /> cc: Veen Chee Foong—Geomatrix Fresno <br /> I <br /> t <br />