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STATE OF CALIFORNIA, ARNOLD SCHWARZENEGGER, Governor <br /> CALIFORNIA STATE LANDS COMMISSION PAUL D. THAYER, Executive Officer <br /> 100 Howe Avenue, Suite 100-South r�•'.` (916) 574-1800 FAX (916) 574-1810 <br /> Sacramento, CA 95825-8202 <br /> •iir Relay Service From TDD Phone 1-800-735-2929 <br /> c from Voice Phone 1-800-735-2922 <br /> Contact Phone: (916) 574-0200 <br /> t - Contact FAX. (916) 574-1925 <br /> July 31, 2009 <br /> File Reference: SD 2008-08-08.1 <br /> Judy Bendix <br /> Mosaic Associates <br /> 647 Tennent Avenue, Suite 102 <br /> Pinole, CA 94564 <br /> Dear Ms. Bendix: <br /> SUBJECT: Geotechnical Work in Old River for the 2-Gate Fish Protection <br /> Demonstration Project, Contra Costa and San Joaquin Counties <br /> This letter is in response to your July 17, 2009 request for authorization to <br /> proceed with conducting five geotechnical borings in the bed of the Old River in <br /> conjunction with the 2-Gate Fish Protection Demonstration Project in Contra Costa and <br /> San Joaquin counties, prior to formal consideration by the California State Lands <br /> Commission (CSLC). <br /> The facts, as we understand them, concerning the proposed project consist of <br /> the following: <br /> The San Luis and Delta Mendota Water Authority (SLDMWA) is proposing to <br /> have five geotechnical borings within the.Old River. The borings will be drilled to a <br /> depth of approximately 60' below the mud line. Thin wall samples will also be taken. A <br /> rotary drilling method will be used and all drilling fluids will be kept in a closed system. <br /> Upon completion of each boring, the borehole will be backfilled with grout in accordance <br /> with the requirements of the San Joaquin County Department of Environmental Health. <br /> The information collected from the borings will be used for the design and future <br /> placement of a gate system designed to restrict sensitive Delta species from moving <br /> into the Old River where they are subject to entrainment by export pumps. <br /> Due to an expedited time schedule, the SLDMWA is requesting permission to <br /> conduct the boring activities in August or September of this year. The SLDMWA <br /> anticipates that the geotechnical work will take approximately one week to complete. <br />