SITE INFORMATION AND CORRESPONDENCE_2

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y -J Disco Property 110 Filbert Street, Stockton - 2 - 30 October 2001 CPT-23. A cluster of monitoring wells is needed either at CPT-23 or downgradient of CPT-23, near CPT-17, to monitor the intermediate and deep water-bearing zones identified. On 30 October 2001, I spoke with Mr.Keith Sheets from CH2M Hill regarding this issue, and we agreed that an intermediate (90 to 100 feet) and deep (145 to 155 feet) cluster near CPT-17 would be appropriate to monitor contamination downgradient of CPT-23. Please install intermediate and deep zone monitoring wells near CPT-17. In our 2 January 2001 letter, we approved the installation and aquifer testing of an on-site extraction well screened across the intermediate sand zone. An aquifer test was planned as part of a feasibility study to determine if groundwater extraction will effectively capture contamination in the source area. In following meetings, the County agreed that interim remediation could be postponed while assessment was completed. However, now that the CPT investigation has been completed and additional monitoring wells are being installed, we would like this extraction well installed and the aquifer test completed as soon as possible. Therefore, by 3 December 200 , please submit a schedule to complete the following tasks: • Install the approved on-site extraction well; • Complete the necessary aquifer testing; and • Submit a Corrective Action Plan (CAP) as presented in Article 11 of the Underground Storage Tank Regulations to address the soil and groundwater contamination remaining both on-site and off-site. The CAP must include a feasibility study to determine the most cost effective remediation alternative to reduce contamination relating to the former underground storage tanks at the Disco property. All drilling and encroachment-permits must be secured through the County and the San Joaquin County Public Works prior to any site work. Please contact Mr. Mike Infurna at (209) 468-3454 at the County and me at least five business days prior to any site work to schedule an inspection appointment. If you have any questions or comments,please call me at(916) 255-3115. M Hartzell, R.G. Associate Engineering Geologist cc: Mr. Mike Infurna, San Joaquin County EHD, Stockton Mr. Mark Owens,UST Cleanup Fund, SWRCB, Sacramento Mr. Steven Erickson, Del Monte Foods, Walnut Creek Mr. Keith Sheets, CH2M Hill, Oakland