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SECOR <br />' International lnco)por caled <br />' September 18, 2002 <br /> Project 77CH.43445.00.0370 SEP 9, 4 20OZ <br />' F�1�VItiu, .. `t'�LTH <br /> Margaret Lagorio PERI'Vil?ISLf�VICES <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br />' 304 East Weber Avenue, Third Floor rJ ' <br /> Stockton, California 95202 <br />' Re: Well Installation and Ozone Sparging Pilot Test Progress Report <br /> Chevron Service Station #9-0557 (I' �_e >� <br /> 139 South Center Street <br /> Stockton, California <br />' Dear Ms. Lagorio: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Products Company <br /> (Chevron), presents the results of well installation activities and ozone sparging (OS) pilot <br /> test progress for the above-referenced site (Figure 1). These activities have been performed <br /> in accordance with SECOR's Work Plan for Feasibility Testing/Corrective Action Plan <br />' Preparation (CAP Work Plan), dated June 1, 2001, and two subsequent addendums to the <br /> CAP Work Plan, dated November 28, 2001 and January 4, 2002, respectively. All <br />' groundwater monitoring wells proposed in the CAP Work Plan, as well as the spargepoints <br /> for the OS pilot test, have been installed. This report summarizes the installation of the <br /> wells. This report also includes a progress report of the ongoing OS pilot test. Other <br />' feasibility testing proposed in the CAP Work Plan, including aquifer testing and dual-phase <br /> extraction testing, has also been performed. Results and conclusions from these tests, as well <br /> as final results from the OS test, will be included in the CAP. <br /> SITE BACKGROUND <br /> The site is an operating Chevron Service Station located on the northwest corner of <br /> Washington Street and South Center Street in Stockton, California, and is within an area of <br /> primarily commercial use. Existing features at the site include two pump islands under a <br />' common canopy, four double-walled, fiberglass underground storage tanks (USTs), and a <br /> station building (Figure 2). Topography in the area of the site is relatively flat, and is <br /> approximately 12 feet above mean sea level (ms]). The nearest surface water bodies are the <br /> Mormon Slough located approximately 114-mile south of the site, the Yacht Harbor located <br /> approximately 1/4-mile north of the site, and the Port of Stockton located approximately one <br /> t3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax uvu%secor.com <br /> l <br />