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Mr. George Luxbacher -2 - 30 May 2013 <br /> On 8 October 2012, a camera survey of well EW-04, which was recently approved to be <br /> converted to an injection well, indicated severe fouling in the well's screened intervals. Due to <br /> this fouling, GHS attempted to redevelop the well. Although the well redevelopment activities <br /> did yield improvement in specific capacity of the well, it was not to a level suitable to <br /> accommodate the proposed injection rates. Therefore, GHS proposes to install injection well <br /> .INJ-14 at an alternate location south of EW-04. The purpose of proposed injection well INJ-14 <br /> is to accelerate the groundwater remedy by introducing treated oxygenated water into targeted <br /> zones to both enhance in-situ aerobic biodegradation of sulfolane and achieve accelerated <br /> pore-volume flushing of COCs towards the extraction wells. <br /> Central Valley Water Board staff concurs with the proposed work in the Report. Please provide <br /> at least a one-week notice of field activities to allow Central Valley Water Board staff the <br /> opportunity to observe the fieldwork. <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. LONGLEY SCD, P.E.,CHAIR I PAMELA C. CREEDON P.E., BCEE,EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley <br /> Cp RECYCLED PAPER <br />