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{ <br /> /-d <br /> SECOR www secor com <br /> INTERNATIONAL 3017 Kilgore Road Suete 100 <br /> S E C O R <br /> INCORPORATED Rancho Cordova CA 95870 <br /> 916$610400 TEL <br /> 916 6661 0430 F.vc <br /> ME 17 <br /> April 30, 2004 <br /> MAY 0 5 2004 <br /> Mr Ed Ralston E p� RM1T PERMIT/SERVICES <br /> ONMENI H <br /> ConocoPhillips <br /> 76 Broadway <br /> Sacramento, CA 95818 <br /> RE Quarterly Remedial Performance Summary-First Quarter 2004 <br /> 76 Service Station No 5886 <br /> 3701 West March Lane <br /> Stockton, 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 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 /> iSITE 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 mlcrosparge 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-Sparge TM 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 AS6SID and AS9SID During the <br /> current quarter the system operated for only 8 hours due to an electrical problem A circuit breaker <br /> has been tripping immediately after startup Records show that this has been a problem for several <br /> years An electrician has been scheduled to inspect the system and determine the cause of the <br /> problem <br /> Ozone Infection Effectiveness <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 January 8, February 27, and March 31, 2004 and <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHg), 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 <br /> dissolved TPHg, benzene, and MtBE in monitoring wells MW-1, MW-2, and MW-3 are provided in <br /> Figures A-1, A-2, and A-3 Certified laboratory analytical reports and chain-of-custody <br /> documentation for the groundwater monitoring events conducted during the first quarter of 2004 are <br /> provided in Attachment C <br /> I IConocoPhill ips\Tosco Marketing158861ReportslQRPS15886 1 Q04 QRPS doc <br />