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Mr. George Luxbacher - 2 - 11 January 2013 <br /> 2. Advance multi-level monitoring well cluster (approximately 200 feet bgs) located <br /> directly south of warehouse 1, to assess the southeastern extent of sulfolane. <br /> 3. Install a multi-level monitoring well cluster (in intermediate and deep zones) next to <br /> LP002 to assess the extent of sulfolane between the former sulfolane source area <br /> (EW-09) and the PSW. <br /> Based on the findings and the conclusions provided by GHS, the Central Valley Water Board <br /> concurs with the proposed work. Provide at least a one-week notice of field activities to allow <br /> Central Valley Water Board staff the opportunity to observe. <br /> If you have questions or comments, please contact me at 916-464-4658, or by E-mail at <br /> ssewalia@waterboards.ca.gov <br /> Siddharth Sewalia <br /> Water Resource Control Engineer <br /> Private Sites Cleanup Unit <br /> cc: Mr. John L. Yanak, J.R. Simplot Company, Lathrop <br /> Ms. Liz Sewell, ARCADIS Inc., Roseville <br /> Mr. Alan L. Prouty, J.R. Simplot Company, Boise, ID <br /> Mr. Brian Crets, J.R. Simplot Company, Lathrop <br /> Mr. Garrett Backus, San Joaquin County Environmental Management Department, <br /> Stockton <br /> KARL E. LONGLEV Sc D, P.E.. CHAIR I PAMELA C. CRBEDOt4 P.E., BCEE,EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95070 1 www.waterboard5.ca.gov/centralvalley <br /> c0—C.......... <br />