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-Discontinue analyzing samples from MW-1 for HVOC's, SVOC's, total oil and grease, and <br /> soluble metals <br /> -Begin analyzing samples from all site-related wells for various parameters to assist in the <br /> evaluation of the potential for intrinsic bioremediation <br /> -Discontinue mapping the potentiometric surface <br /> -Begin reporting results of quarterly monitoring on a semi-annual frequency <br /> In addition to the evaluation of the potential for intrinsic bioremediation, Chevron will continue pursuing <br /> the source for the unidentified hydrocarbons at each well Also, the distribution of dissolved hydrocarbons <br /> will be looked at to determine the extent of plume migration and to determine the possibility of an offsite <br /> source <br /> The proposed modifications would maintain Chevron's ability to effectively evaluate groundwater <br /> conditions beneath the subject site and would provide the information in the most cost effective manner <br /> Subsequent changes to the proposed program may be necessary depending on the evaluation of future <br /> results Pending approval from your agency, Chevron will implement this proposal beginning second <br /> quarter of this year <br /> If you have any questions or comments, please contact me at(510) 842-8695 <br /> Sincerely, <br /> /J'aT <br /> Brett L Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br /> Attachment <br /> cc Elizabeth Thayer, Central Valley RWQCB, Sacramento, CA <br /> Kathryn Pudenz, 519 Castro St, Box 88, San Francisco, CA 94114 <br /> Stella Rickman,P O Box 244, Tracy, CA 95378 <br /> Rudy Sancliez, Tracy Express Wash&Lube, 2480 Tracy Blvd ,Tracy, CA 95376 <br /> Fran Thie, Blaine Tech Services, Inc , 1680 Rogers Ave, San Jose, CA 95112 (w/o attach) <br /> Bette Owen, Chevron Products Company, San Ramon, CA (w/o attach) <br /> I <br />