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f Dopaco, Inc. -2 - 10 July 2012 800 W. Church St., Stockton San Joaquin County Upon completion of the MIP/CPT investigation, the results and maps of the sample locations will be provided in a letter report with location recommendations for a minimum of four groundwater monitoring wells, and proposed well construction details. Following regulatory approval of the wells work plan, the 2" diameter polyvinyl chloride (PVC) wells (DMW-1 through DMW-4) will be installed and screened in first water (historically 15' bgs to 20' bgs). DMW-1 through DMW-4 will be sampled and analyzed for toluene by USEPA Method 82606.:A final report of the investigation and monitoring wells installation will be submitted, and further recommendations will be made for additional work as warranted. The CPT/MIP investigation_(including the letter report) will be completed within 60 days of the Workplan approval pending subcontractor availability. A schedule for the wells installation and reporting will be included in the letter report. The Workplan is conditionally approved with the following additions: • Grab groundwater sample analyses for USEPA Method 82606 will report all peaks, including toluene, in the data provided in the reports. • Status reports, submitted to me at the email address below, are due on the 30th day of each month until completion of the approved work, and shall include any changes to the proposed schedule or other problems associated with the fieldwork. The first status report is due 30 July 2012. • The letter report/work:plan is due 15 September 2012. Please give the San Joaquin County Environmental Health Department and myself at least 3 working days' notice prior to initiating fieldwork. You may contact me with questions by phone at (916) 464-4615 or by email at ibartonCa�waterboards.ca.gov. /s/original signed by James L. L. Barton, P. G: Engineering Geologist UST Program cc: see attached list of interested parties