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SECOR www secor com <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C Q R INCORPORATED Rancho Cordova CA 95670 <br /> 916 861-0400 rex <br /> 916-861 0430 vnx <br /> April 6, 2004 <br /> Mr Ed Ralston <br /> APR 0 8 2004 <br /> ConocoPhillips ENVIRONMENT HEALTH <br /> 76 Broadway PERMIT/SERVICES <br /> Sacramento, CA 95818 <br /> RE Quarterly Remedial Performance Summary-Third and Fourth Quarter 2003 <br /> ConocoPhillips Station No 5886 <br /> F01 West March Lane <br /> tockton, CA <br /> SECOR Project No 77CP 60004 01 5886 <br /> Dear Mr Ralston <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of ConocoPhilllps, <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 fourth quarter <br /> 2003 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 at the intersection of West March Lane and Brookside road in Stockton, <br /> California The site is currently an operating 76 service station During the first quarter 2002 an <br /> ozone microsparge system was Installed and activated at the site SECOR took over site operation in <br /> September 2003 <br /> REMEDIAL. PERFORMANCE EVALUATION <br /> Ozone Infection Operation <br /> The ozone Injection systems consist of panel mounted KVA C-SpargeTm Systems that produce 4 <br /> grams per hour (0 009 pounds per hour) of ozone The system injects to ten sparge points in eight <br /> wells AS1 through AS5, AS7, AS8, and AS10, and nested wells AS6S/D and AS9S/D During the <br /> third and fourth quarter of 2003 the system operated at 1 3% runtime The system was shutting off <br /> immediately after startup because the breaker was tripping The distributor was called out to the site <br /> during the first quarter 2004 and SECOR believes that the problem has been resolved <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-1, MW-2, and MW-3 on July 7, September 26, October 31, November 25, and <br /> December 17, 2003 and analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX compounds), and methyl tert-butyl ether (MtBE) <br /> Results of monthly groundwater sampling events are summarized in Table A-2 Concentration <br /> versus time graphs for dissolved TPHg, benzene, and MtBE In monitoring wells MW-1, MW-2, and <br /> MW-3 are provided in Figures A-1, A-2, and A-3 Certified laboratory analytical reports and chain-of- <br /> custody documentation for the groundwater monitoring events conducted during the third and fourth <br /> quarter of 2003 are provided in Attachment C <br /> 11ConocoPhilhpslTosco Marketing158861Reports\QRPS15886 4Q03 QRPS doc <br />