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Mr. Nam Baek -2- 26 August 2011 <br /> , <br /> Based on the April 2011 investigations, GHS proposes to: <br /> a. excavate soil to remove source area contaminated soil in the vicinity of well <br /> PW26. The propose6soil excavation includes excavating soil from a 3890 ft2 <br /> 'to the depth of the water table. Assuming a depth approximately 13 feet bgs, <br /> approximately 1,873 cubic-yards of soil will be removed and replaced with clean <br /> material. <br /> b. abandon monitoring wells PW26-086, PW26-154, and PW26-199, located <br /> within the proposed excavation area. The abandoned wells will be replaced by <br /> new monitoring wells PW27-40, PW28-40, PW29-40. Additionally, intermediate <br /> and deep zone monitoring wells PW26-154 and PW26-199 will be relocated <br /> approximately 10 feet north of their current locations and renamed PW26A-154, <br /> and PW26A-199. <br /> c. expand the current, on-site extraction network by installing a new extraction <br /> well EW-09 to expedite the removal of sulfolane affected groundwater in the <br /> shallow groundwater zone. <br /> Central Valley Water Board staff concludes that source area soil removal is an appropriate <br /> cleanup action to prevent continued contamination of groundwater by sulfolane leaching from <br /> contaminated soil. Therefore, staff concurs with the work proposed in the Work Plan. <br /> Monitoring wells PW26-086, PW26-154, and PW26-199 need to be destroyed in compliance <br /> with San Joaquin County Environmental Health Department requirements. Please-obtain all <br /> necessary permits from local or State agencies, as needed. Provide at least one-week notice <br /> of field activities to allow Central Valley Water Board staff to observe. By 16 December 2011, <br /> submit the results in a report. If you have questions or comments, please contact Siddharth <br /> Sewalia at 916-464-4658, or by e-mail at ssewalia waterboards.ca. ov <br /> r <br /> Siddharth Sewalia <br /> Water Resource Control'Engineer <br /> Private Sites Cleanup <br /> Cc: Mr. Tim Van Domelen, J.R. Simplot Company, Lathrop <br /> Ms. Liz Sewell, ARCADIS Inc., Roseville <br /> Mr. Alan L. Prouty, J.R. Simplot Company, Boise, 1D <br /> Mr. Garrett Backus, San Joaquin County Environmental Management Department, <br /> Stockton <br />