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SECOR www secorcom <br /> INTERNATIONAL <br /> SE C ® R iNCORPORATED 3017 Kilgore Road Suite 100 <br /> Rancho Cordova GA 95670 , <br /> 916-861-0400 TEL <br /> 916-861-0430 Fnx <br /> March 3, 2005 m1D ECENED 6t" iYV <br /> MAR 7 — Z005 <br /> Ms Victoria L McCartney ENVIRONMENT HEALTH ' 0 yVd <br /> San Joaquin County Environmental Health Department pE** R=ES �y,vv�-(t/- <br /> ; S� <br /> 304 East Weber Avenue, Third Floor S 5 <br /> Stockton, California 95202-2708 s <br /> RE Quarterly Groundwater Monitoring Report and Remedial Performance <br /> Summary- Fourth Quarter 2004 {t.Of 0 <br /> 76 (Former BP) Service Station No 11193 <br /> 3202 West Hammer Lane �13° <br /> Stockton, California <br /> SECOR Project Nos 77CP 60193 01 0001/77BP 50193 02 0427 ,{ <br /> 77CP 60004 01 0193/77BP 56193 02 0936 <br /> Dear Ms McCartney <br /> SECOR International Incorporated (SECOR) is providing this report to summarize the fourth <br /> quarter 2004 groundwater monitoring event at the site referenced above (Figure 1) This <br /> �} report also presents a remedial action performance summary for the ozone injection system <br /> operating at the site A brief site background, quarterly monitoring and sampling status <br /> report, and remedial performance summary report are presented below <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 INVESTIGATIONS AND REMEDIAL ACTION <br /> M <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 soil sample was collected from the base of the <br /> excavation at approximately 10 feet below ground surface (bgs) Laboratory analytical <br /> results reported gravimetric waste oil as petroleum oil at 55 parts per million (ppm, EMCON, <br /> •� 1994) <br /> r <br />