Laserfiche WebLink
E SECOR www secor cam <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C O R INCORPORATED Rancho Cordova CA 95670 <br /> 816-8$ -0400 TEL <br /> 816-86 <br /> 1-0430 Fax <br /> July 28, 2004 _ <br /> .Err <br /> Ms Liz Sewell JUL 3 0 2004 <br /> ConocoPhillips <br /> 76 Broadway ENVIRONMENT HEALTH <br /> Sacramento, CA 95818 PERMIT/SERVICES '-J'�rljo <br /> i <br /> rte' <br /> RE Quarterly Remedial Performance Summary- Second Quarter 2004 <br /> Circle K Store No 011193 <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> SECOR Project No 77CP 60004 01 0193/77BP 56193 02 0936 <br /> Dear Ms Sewell <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of ConocoPhilllps, <br /> presents a remedial action performance summary for the ozone infection system operating at the site <br /> referenced above Included in this report are tables and figures summarizing the system operation <br /> during the current quarter Field data sheets and laboratory reports are included as Attachments A <br /> and B, respectively A brief site background and the status of recent remedial activities are presented <br /> below <br /> SITE BACKGROUND <br /> The site is situated in a mixed commercial/residential area on the southwest corner of West Hammer <br /> Lane and Kelley Drive in Stockton, California The current station consists of two 12,000-gallon <br /> double-walled gasoline underground storage tanks (LISTS), two dispenser islands, associated <br /> product lines, and a station building Historical files indicate that British Petroleum (BP) acquired the <br /> site from Mobil in May 1989 The gasoline service station operated under BP ownership until Tosco <br /> purchased the property in August 1994 An ozone infection system was installed by SECOR, and <br /> started up on May 25, 2004 <br /> REMEDIAL PERFORMANCE SUMMARY <br /> Ozone Infection Operation <br /> The ozone infection system consists of a panel mounted KVA C-Spargelm System that produces 4 <br /> grams per hour (0 009 pounds per hour) of ozone The system infects to 10 sparge wells OZ-1 <br /> through OZ-10 System operational data is presented in Table 1 During the current quarter the <br /> system operated for 459 hours resulting in 98% operation System operational data is presented in <br /> Table 1 <br /> Ozone Injection Effectiveness <br /> The performance of the ozone infection system is evaluated by groundwater sampling Monthly <br /> groundwater samples were collected from monitoring wells VW-1, MW-2R, and MW-4 on May 25, <br /> and June 16, 2004 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 2 Certified laboratory <br /> analytical reports and chain-of-custody documentation for the groundwater monitoring events <br /> conducted during the second quarter of 2004 are provided in Attachment B <br /> I IConocoPhdicpslTosco Marketing11I1931Reports\QRPS111193 2004 QRPS doc <br />