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,n ne� , eelseeR PETE WILSON, Qovemor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 Rodder Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> PHONE: (916) 255-3000 <br /> FAX: (916) 255-3015 <br /> 12 January 1996 <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 /> PROPOSAL TO REPLACE EXTRACTION WELL EW-4, OCCIDENTAL CHEMICAL <br /> CORPORATION, LATHROP, CALIFORNIA <br /> We are in receipt of your letter dated 3 January 1996 proposing the subject EW-4 replacement. I <br /> have discussed the matter with Mr. Erik Friedrich of TreaTek and he has agreed to some additional <br /> details not found in the written proposal. Those details are to increase the borehole diameter to 14 <br /> inches, using centralizers during construction of the well, and attempting to use a PVC -wrapped <br /> screen instead of the regular slotted PVC screen. The latter is contingent on locating a source of the <br /> wrapped screen and the availability of the screen. The reason for requesting the screen change is to <br /> increase the efficiency of the well since there is a considerable more open area on the wrapped- <br /> screen than the slotted screen. <br /> We have discussed this matter with Mr. Tom Dahl of the United States Environmental Protection <br /> Agency and Mr. Marvin Woods of the Department of Toxic Substances Control and we have their <br /> concurrence with this response. <br /> If you have any question regarding this matter, please call me at (916) 255-3025. <br /> AX41'1�r 9 <br /> ALEXANDER MA ONALD <br /> Program Coordinator <br /> cc: Mr. Tom Dahl, U.S. Environmental Protection Agency, Denver <br /> Mr. Marvin Woods, Department of Toxic Substances Control, Sacramento <br /> Mr. Erik Friedrich, TreaTek-CRA Company, Stockton A <br /> bbl <br /> ' Yv �a <br />