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STATE OF CALIFORNIA- Environmental Protection Agency PETE WILSON, Govem <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 Routier Road, Suite A • <br /> Sacramento, CA 95827-3098 INVIROi ME.M i AL HEAU11 <br /> PH E 5-3 <br /> : (916) 25000 PER�'li,'r SERVICE <br /> F1VJB)255-3015 <br /> 95 MAR 16 RM 11' lab 24 January 1995 <br /> Mr. John R. Nichter <br /> Operations Manager <br /> Special Environmental Programs <br /> Occidental Chemical Corporation <br /> P.O. Box 728 <br /> Niagara Falls, New York 14302-0728 <br /> WELL ABANDONMENT FORS PLAN ANIS SOIL REMOVAL WORK PLAN, OCCIDENTAL <br /> CHEMICAL CORPOR�dT701V (® CHEM), GROUND �g.A REMEDY pROGR,4M <br /> L 47HROP, CALIFORNIA <br /> Thank you for the submittal of the subject work plans. Regional Board staff have reviewed them <br /> and present the following comments which have the concurrence of Mr. Tom Dahl of the United <br /> States Environmental Protection Agency and.Mr. Jose Salcedo of the California Department of Toxic <br /> Substances Control: <br /> 1. The proposal for removal of the soils contaminated by DBCP and EDB is acceptable and <br /> Oxychem may proceed. <br /> 2. The ground water monitor wells scheduled for abandonment are depicted in the well logs of <br /> being gravel packed from the ground surface to the total depth of the well. If this is actually <br /> the case, then the proposal for filling the wells with cement grout using a tremie pipe is not <br /> sufficient. The well will need to be perforated along the entire Iength and the abandoned by <br /> pressure grouting. The grouting of the well should be perforated so as to completely fill the <br /> casing and the gravel pack. The work plan should be modified to provide the details of <br /> abandonment in this manner. We understand that it is desired to abandon the wells in a <br /> timely manner so as to allow development of the property near well cluster PW-17. We will <br /> commit to reviewing the revisions within one week of receiving them. <br /> The soil removal is not contingent upon the approval of the well abandonment work plan and <br /> Oxychem need not delay in its implementation. <br /> If you have any question regarding this matter, please call me at (916) 255-3025. <br /> /XAANDER MA ONALD <br /> Program Coordinator <br /> cc: Mr. Tom Dahl U.S. <br /> Environmental Protection Agency, Deaver <br /> Mr. Jose Salcedo, Department of Toxic Substances Control, Sacramento <br /> Mr. Erik Friedrich, Treatek-CRA, Inc., Stockton <br />