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{ SECOR www secorcom <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916$61-0400 TEL <br /> 816-061-0430 FAX <br /> March 24, 2005 <br /> nLD <br /> n ECE YE <br /> Ms Victoria L McCartney D <br /> San Joaquin County Environmental Health Department POAR 9 p 2005 <br /> 304 East Weber Avenue, Third Floor ENVlRONhRENT HEALTH <br /> Stockton, California 95202-2708 pERM1T/SEROrES <br /> RE Off-Site Monitoring Well Installation Report <br /> 76 (Former BP) Service Station #11193 <br /> 3 <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> SECOR Project Nos 77BP 50193 04 0146/77CP 60193 04 0012 <br /> Dear Ms McCartney <br /> SECOR International Incorporated (SECOR) has prepared this letter report, on behalf of <br /> ConocoPhillips and British Petroleum (BP), to document the installation of two offsite <br /> shallow monitoring wells at the site listed above (Figure 1) The objective of this work is to <br /> delineate the extent of dissolved phase petroleum hydrocarbons in the groundwater down <br /> gradient from the site This work was proposed in SECOR's Revised Interim Remedial <br /> Action Plan and Work Plan for Ozone Sparge Well Installation and Additional Off-Site <br /> Assessment dated September 15, 2003, which was approved by the San Joaquin County <br /> Environmental Health Department (SJCEHD) in correspondence dated December 26, 2003 <br /> (Attachment 1) <br /> 3 <br /> SITE BACKGROUND <br /> The site is situated in a mixed commercial/residential area on the southwest corner of West <br /> Hammer Lane and Kelley Drive in Stockton, California The current station configuration <br /> consists of three 10,000-gallon double-walled (two gasoline and one diesel) underground <br /> storage tanks (USTs), two dispenser islands, associated product lines, and a station <br /> building In May-2004, one of the 10,000-gallon USTs (previously utilized for gasoline) was <br /> converted for diesel storage, and the station began dispensing diesel fuel <br /> Historical files indicate that BP acquired the site from Mobil in May 1989 The gasoline <br /> service station operated under BP ownership until Tosco purchased the property in August <br /> 1994 Historical UST permit application information suggests that the site historically <br /> operated as a gasoline service station since at least 1978 (EMCON, 1994) <br /> PREVIOUS ASSESSMENTS AND REMEDIAL ACTION <br /> In April 1987, KEI observed the removal of one 1,000-gallon waste oil UST in the <br /> southwestern portion of the site One sod sample was collected from the base of the <br /> 10) excavation at approximately 10 feet below ground surface (bgs) Laboratory analytical <br />