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<br />4\ <br /> <br /> <br />. e <br />United States Department of the Interior <br /> <br />RECEl\fED <br /> <br />',. <br />'~ <br /> <br />('REPLY <br />REFER TO: <br />LC-430 <br /> <br />BCREAV OF RECLAMA nON <br />LOWER COLORADO REGIONAL OFFICE <br />P.O, BOX 427 <br />BOULDER CITY, NEVADA 89005 <br />I <br /> <br />JUN 1 2 " -1 <br /> <br />OOWRAOO ~VA TEA <br />~ATION <br />, D <br /> <br />~1::> ~. <br /> <br />. -' .;, ..~. . lI'\ <br />'';';~;.JJ <br /> <br />APR 1 2 1989 <br /> <br />1.~}9 <br /> <br />Mr. Dennis B. Underwood <br />Executive Director <br />Colorado River Board of California <br />107 South Broad~ay, Room 8103 <br />Los Angeles CA 90012 <br /> <br />T <br />I <br />, <br /> <br />I COU.l",,~ _./ATER <br />"CoNSERVA -nON <br />pr- <br /> <br />Subject: Salinity Differential Bet~een Imperial Darn and the Northerly <br />International Bou~dary ~ith Mexico (NIB) (Salinity, Salinity <br />Management, Salinity Control Coordination, Water Use, Water <br />Utilization, Water Quantity, Water Quality, Water Quality Study, <br />Water Supply, Water Policy) <br /> <br />Dear Mr. Underwood: <br /> <br />As requested at our quarterly Eeeting on January 20, 1989, enclosed for your <br />information is a document entitled "Salinity Monitoring and Decision Making <br />Process in Support of Minute 242." This document describes the assumptions <br />used in calculating the annual salinity differential between Imperial Dam and <br />NIB an( the sources of data used in these calculations. Also presented is a <br />descrir:ion of the decision making process used to decide if any actions ~re <br />necessary and possible actions that might be taken to assure that the <br />requirements of ~inute 2u2 aTe met, prior to the operation of the Yuma <br />Desalting Plant. <br /> <br />If you have any questions, plezse do not hesitate to contact us. <br /> <br />Sincerely, <br /> <br /> <br />~ <br /> <br />Edward M. Hallenbeck <br />ACTING fOlgional Director <br /> <br />Enclosures <br /> <br />cc: Project Manager, Yuma AZ <br />Attention: YPO-430 <br />(w/cy of end) <br />