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SECOR www.Secor,com <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C 0 R INCORPORATED Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 FAX <br /> May 4, 2004 <br /> MAY 0 6 2004 <br /> Mr, Ed Ralston ENVIRONMENT HEALTH <br /> ConocoPhillips PERMIT/SERVICES <br /> 76 Broadway <br /> Sacramento, CA 95818 <br /> RE: Quarterly Remedial Performance Summary-First Quarter 2004 <br /> 76 (Former BP) Station No. 11195 <br /> 16500 South Interstate 5 "Fi VC " <br /> Lathrop, CA <br /> SECOR Project No.: 77CP.60004.01.11195 <br /> Dear Mr. Ralston: <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of ConocoPhillips, <br /> presents a remedial action performance summary for the ozone injection system operating at the site <br /> referenced above. Attachment A presents the remedial performance summary for the first quarter <br /> 2004. Field Data Sheets are presented as Attachment B. Certified laboratory analytical reports and <br /> chain of custody documentation are presented as Attachment C. A brief site background and the <br /> status of recent remedial activities are presented below. <br /> SITE BACKGROUND <br /> The site is located just off of Interstate 5 South in Lathrop, California. The site is currently an <br /> operating 76 service station. An ozone sparge system was placed into operation on December 20, <br /> 2002. SECOR took over site operation in September 2003. <br /> REMEDIAL PERFORMANCE EVALUATION <br /> Ozone Injection Operation <br /> The ozone injection system consists of a panel mounted KVA C-SpargeTM System that produces 4 <br /> grams per hour (0.009 pounds per hour) of ozone. The system injects ozone to fifteen ozone wells: <br /> SP-1 through SP-15. System operational data is presented in Table A-1. The system was down for <br /> the first part of the first quarter due to electrical problems. It as restarted on February 17, 2004, <br /> however, it was shut down again on March 31, 2004 due to line leaks. System will be repaired and <br /> restarted during the second quarter 2004. <br /> i <br /> Ozone Injection Performance <br /> The performance of the ozone injection system in causing breakdown of contaminants beneath the <br /> site is determined by groundwater sampling. Monthly groundwater samples were collected from <br /> monitoring wells MW-3 and MW-10 on January 20, and February 27, and March 31, 2004 and <br /> analyzed for total petroleum hydrocarbons as gasoline (TPH9), benzene, toluene, ethylbenzene, and <br /> total xylenes (BTEX compounds), and methyl tert-butyl ether (MtBE), Results of monthly <br /> groundwater sampling events are summarized in Table A-2. Concentration versus time graphs for I <br /> dissolved TPHg, benzene, and MtBE in monitoring wells MW-3 and MW-10 are provided in Figures <br /> A-1 and A-2. Certified laboratory analytical reports and chain-of-custody documentation for the <br /> groundwater monitoring events conducted during the first quarter of 2004 are provided in Attachment <br /> C. <br /> I <br /> I:IConocoPhillips\Tosco Marketing1111951QRPS111195 1Q04 QRPS,cloc <br />