SITE INFORMATION AND CORRESPONDENCE FILE 2

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S E C O R --- - DATE: January 29, 2007 QUARTERLY REPORT Station Number: 11192 Site Address: 1403 West Country Club Boulevard, Stockton, California Consulting Company: SECOR International, Inc. — Ms. Catherine Spelis SECOR Project No.: 77BP.50192.00 and 77CP.02390.00 Primary Agency/Contact: San Joaquin County Environmental Health Department (SJCEHD) Mr. Mike Infurna WORK PERFORMED THIS QUARTER [Fourth —2006] 1. SECOR submitted the Quarterly Groundwater Monitoring and Remediation Progress Report— Third Quarter 2006 on November 9, 2006. 2. Groundwater monitoring and sampling activities were performed by SECOR on November 6, and 7, 2006. 3. Continued operation, and performed monthly maintenance of the Ozone Sparge (OS) system. WORK PROPOSED FOR NEXT QUARTER [First—2007] 1. Groundwater monitoring and sampling event will be performed by SECOR. 2. Continue operation and perform monthly maintenance of the on-site OS system. OR will 'reevaluate the number and location of the additional groundwater monitoring wells proposed in the approved Work Plan for Additional Site Assessment dated October 18, 2005. t ro se changes to the workptatt in an addendum which will be submitted dunng ° "' DISCUSSION The site is located at 1403 West Country Club Boulevard in Stockton, California, and is currently an operating 76 service station (Figure 1). The operating facility consists of a station building, a car wash, an auto service bay, an oil change building, four dispenser islands, a canopy, three 10,000-gallon gasoline (double-walled) underground storage tanks (USTs), one 2,500-gallon waste oil UST (operated by others), and associated product lines. The site was operated as a gasoline service station by Mobil Oil Company (Mobil), following the installation of two 10,000-gallon unleaded gasoline USTs, one 10-000-gallon leaded gasoline UST, three 3,000-gallon motor oil USTs, and one 3,000-gallon used oil UST, associated piping and dispensers, and other facility structures in 1976. The site was purchased by BP Oil (BP) in May 1989. The site was operated under BP ownership until Tosco Corporation (now ConocoPhillips) assumed operations in 1994. Properties in the site vicinity are primarily residential and commercial developments. A former Shell Service Station was located across Pershing Avenue, east of the site (1267 Country Club Boulevard) (Figure 2). Previous investigation information and site history is included in Attachment A. The current and historical groundwater monitoring and sampling data are included in Tables 1 and 2, and are presented in Figures 3 through 7. The current and historical groundwater split samples collected from the Shell Service Station at 1267 Country Club Lane are included as Table 3. The current and historical groundwater flow direction and hydraulic gradient are summarized in Table 4 and Figure 8. Well construction details are found in Table 5. Operational and monitoring data for the OS system are summarized in Tables 6 and 7. SECOR's 1x 1:1BP-ARC0'\05 BP-COP Sites\1 1 192\Reports\QMR-QRPS\2006\11192 4Q2006.doc SECOR Intemational Inc.