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SECOR www secorcom <br /> NTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C O R INCORPORATED Rancho Cordova CA95670 <br /> n ER 7t-,i� <br /> May 4, 2004 MAY 0 6 2004 <br /> ENVIRONMENT HEALTH <br /> Mr Ed Ralston <br /> PERMIT/SERVICES <br /> ConocoPhillips <br /> 76 Broadway <br /> Sacramento, CA 95818 <br /> RE Quarterly Remedial Performance Summary-First Quarter 2004 <br /> Circle K Store No 011192 <br /> 1403 Country Club Drive <br /> Stockton, CA <br /> SECOR Project No 77CP 60004 01 11192 <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 at the intersection of Country Club Drive and North Pershing Avenue in Stockton, <br /> California The site is currently an operating 76 service station In December 2002, an ozone sparge <br /> system was installed and brought online 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 ten ozone wells SP- <br /> A through SP-H, SP-J, and SP-K System operational data is presented as Table A-1 The system <br /> was placed into operation on December 20, 2001 During the current quarter the system operated at <br /> 22% runtime The system was down during most of the first quarter due to a failed compressor The <br /> compressor was replaced and the system restarted on March 10, 2004 <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 MW4 on January 20, February 12, and March 31, 2004, and analyzed <br /> for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX compounds), methyl tert-butyl ether (MtBE), and tert-butyl alcohol (TBA) Results of <br /> monthly groundwater sampling events are summarized In Table A-2 Concentration versus time <br /> graphs for dissolved TPHg, benzene, MtBE, and TBA in monitoring wells MW-3 and MW-4 are <br /> provided in Figures A-1 and A-2 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 <br /> I\ConocoPhdlips\Tosco Markettng1111921QRPS111 192 1404 QRPS doc <br />