SITE INFORMATION AND CORRESPONDENCE

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Shell Station (former) page 2 1267 Country Club, Stockton April 5, 2010 It was stated in the SR that Shell is awaiting a response from the EHD on Shell's recommendation to prepare a feasibility study. In the EHD correspondence dated August 25, 2008, Shell was advised that the pending report of findings for Shell's July 31, 2007, approved work plan that was completed on August 11, 2008 (S-12 installation), was to include either a work plan for additional investigation or a feasibility study. The Shell report of findings did not include the feasibility study or a work plan. The EHD has reviewed the laboratory data for this site and has determined that Shell has not characterized the site completely. It appears that multiple plumes are present on site. The EHD is concerned with how each of these areas are contributing to groundwater quality degradation. Include a discussion of this concern and the following concerns in the feasibility study or work plan due on Geotracker by May 3, 2010: 1. The lack of lateral and vertical delineation of the dissolved petroleum groundwater plume in and around monitoring well S-14. The source of this elevated level of dissolved petroleum hydrocarbons is to be evaluated by Shell and a plan to continue the required delineation in this area is to be included. 2. The lack of the lateral and vertical delineation of dissolved motor oil and oil/grease in the groundwater around monitoring well S-13. 3. The groundwater quality in new monitoring well S-12 and how it fits into Shell's previous hypothesis that the contamination in this area is from the ConocoPhillips site to the west. In order to continue the delineation investigation around the former waste oil tank, the EHD directs Shell to analyze groundwater samples collected from monitoring wells S-1, S- 7, S-13, S-14, and S-16 for Oil & Grease (1664A) and Motor Oil (8015m) during the second quarter 2010. After the event has been conducted if the results are non-detect at acceptable LUFT detection limits, Shell may discontinue the analyses for these constituents. Status reports (SR) submitted in the future are to include a status update of the site during the reporting period. Typical status comments include a brief discussion concerning whether or not the site's soil and groundwater plumes are delineated, what the investigative and/or remediation status of the site is during the reporting period and a brief description of any reports or work plans that may be pending or are due at the EHD in the near future. If you have any questions, please call Michael Infurna at (209) 468-3454. /l Michael J. Infurna Jr., REHS Nuel C. Henderson Jr., PG Senior Registered Environmental Health Specialist Engineering Geologist c: Mr. James L. Barton, CVRWQCB, Underground Storage Tank Unit, 11020 Sun Center Drive, #200, Rancho Cordova, CA 95670-6114 Mr. Mark Owens, SWRCB, Division of Clean Water Programs, Underground Storage Tank Program, P.O. Box 944212, Sacramento, CA 94244-2120 Mr. Tom Sparrowe, Conestoga-Rovers & Assoc., 5900 Hollis St., Suite A, Emeryville, CA 94608 Ms. Penny Jasper or Mr. Phil Metzger, Bank of the West, 1450 Treat Blvd., Walnut CrPPk CA 9459E