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SECOR <br /> International Incorporated <br /> November 28, 2001 <br /> Project 077.43445.331 (��� � 'YEp <br /> Rebecca Setliff NOV 2 9 2001 <br /> San Joaquin County Environmental Health Division ENMR,}4 VENT HEALTH <br /> 304 East Weber Avenue, Third Floor PEl�lt"; f"ERVIr.ES <br /> Stockton, California 95202 <br /> Re: Addendum to Work Plan for Feasibility Testing/ <br /> Corrective Action Plan Preparation <br /> Chevron Service Station#9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> Dear Ms. Setliff: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Products Company <br /> (Chevron), presents this addendum to the Work Plan For Feasibility Testing/Preparation <br /> Corrective Action Plan Preparation (the Work Plan), dated June 1, 2001, for the above <br /> referenced site (Figure 1). The San Joaquin County Environmental Health Division <br /> (SJCEHD) approved the Work Plan on June 11, 2001. This addendum to the Work Plan has <br /> been prepared to outline the performance of an additional feasibility test to assist in the <br /> evaluation of potential groundwater remedial alternatives for the site. SECOR proposes to <br /> perform an ozone sparging (OS)pilot test, in addition to the aquifer testing and dual-phase <br /> extraction testing, which was proposed in the Work Plan. This addendum includes a <br /> discussion of the rationale and scope for the OS pilot test, as well as a revised schedule for <br /> completion of feasibility testing and preparation of the Corrective Action Plan (CAP). <br /> OZONE SPARGING PILOT TESTING <br /> Overview of Ozone Sparging <br /> Ozone is a strong oxidant capable of reacting with hydrocarbons in the gas and dissolved <br /> liquid phases. Previous work has documented the degradation of many constituents by <br /> ozone, including chlorinated and petroleum hydrocarbons. The treatment process forms non- <br /> toxic dissolved by-products including water and carbon dioxide. <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br />