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January 9, 2002 <br />Project 077.43452.570 <br />Mr. Marty Hartzell <br />Regional Water Quality Control Board <br />(RWQCB)-Central Valley Region <br />3443 Routier Road, Suite A <br />Sacramento, CA 95827-3098 <br />ILIXE: Final Remediation Plan Addendum <br />Former Chevron #9-5775 <br />301 West Kettleman Lane <br />Lodi, California <br />Cleanup and Abatement Order No. 5-00-704 <br />Dear Mr. Hartzell: <br />E <br />S COR <br />International Incorporated <br />JAN 14 2002 <br />ENVIRONMENT HEALTH <br />PERMIT/SERVICES <br />This letter, prepared by SECOR International Incorporated (SECOR) on behalf of <br />Chevron Products Company (Chevron), presents a second addendum to the problem <br />assessment report/final remediation plan (PAR/FRP) dated September 22, 2000. The <br />most recent previous addendum was dated June 5, 2001. The changes proposed in this <br />current addendum were discussed in our November 13, 2001 meeting and are as <br />follows: <br />• Due to the declining concentrations of constituents of concern both onsite and <br />offsite, the design and installation of an offsite remedial system, as proposed in <br />the June 5, 2001 addendum, will be postponed indefinitely. <br />• Offsite monitoring wells located on the south side of West Kettleman Lane with <br />confirmed concentrations of methyl tert-butyl ether (MtBE) at or above 5 <br />micrograms per liter (ug/1) may be subject to interim remediation consisting of a <br />batch extraction of groundwater. If batch extraction fails to sufficiently reduce <br />MtBE concentrations, additional remedial measures, including the possible <br />installation of an offsite remedial system, will be considered and discussed with <br />the RWQCB. <br />2301 Leghorn Street, Mountain View, CA 94043 650.691.0131 650.691.9837 Fax www.secor.com <br />