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"rit"10 <br /> Chevron <br /> Chevron Pipe Line Company <br /> July 23, 1998 4000 Executive Parkway,Suite 400 <br /> San Ramon,CA 94583 <br /> P.O.Box 6059 <br /> Mr. Kit Custis San Ramon.CA 94583-0759 <br /> California Regional Water.Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3003 <br /> PROPOSED REVISIONS TO MONITORING AND REPORTING <br /> PROGRAM No. 96-814 CORRAL HOLLOW AND GRANT LINE ROAD <br /> Dear Kit: <br /> Per our meeting earlier this year, Chevron Pipe Line Company (CPL)has prepared and submits <br /> the enclosed document prepared by Geomatix Consultants, Inc. entitled"Proposal for Revising <br /> Groundwater Monitoring Frequency and Performing Well Abandonment Corral Hollow and <br /> Grant Line Roads Tracy, California" for your review and consideration. Close to ten years of <br /> groundwater monitoring data indicate a stable petroleum hydrocarbon plume beneath the site <br /> with no off-site migration. Further, CPL'S operation of a groundwater remediation system <br /> detailed in the January 1998 "Remediation Performance Evaluation Report", dramatically <br /> decreased residual petroleum hydrocarbon concentration in the affected area. <br /> The proposed revisions to Monitoring and Reporting Program No. 96-814 (MRP) reflect our <br /> discussion earlier this year with a few modifications: <br /> 01 CPL proposes an increase in monitoring frequency for two wells; <br /> 0 CPL proposes semi-annual monitoring rather than quarterly; and <br /> • CPL proposes abandonment of all extraction wells used for the remedial effort as well as <br /> several monitoring wells. <br /> If you are in agreement with the proposed revisions to the MRP, please initiate the modifications <br /> and issue a new MRP. Following you review of the enclosed proposal,please contact Mr. Dan <br /> Lapporte at (925) 842-6718 with any questions or concerns. <br /> Sincerely, <br /> i <br /> K. L. Hower <br /> Project Manager <br /> California Site Remediation <br /> cc: Dave Weinstein, Cardoza Properties <br /> Marty Bloes, Geomatrix Consultants <br /> i <br /> i <br />