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CONFIDENTIAL INTERNATIONAL BOUNDARY AND WATER COMMISSION UNITED STATES AND MEXICO 206 SAN FRANCISCO STREET EL PASO, TEXAS 79950 MAILING ADDRESS: P.O. BOX 1859 Ciudad Juárez, Chih., July 1, 1964 MEMORANDUM OF CONVERSATION PARTICIPANTS: The two Commissioners and the two Secretaries. SUBJECT: Colorado River Salinity DISTRIBUTION: ARA/MEX; AmEmbassy, Mexico, D. F.; the Commissioner; PE(S); PE; OE; Secy. Colorado River Salinity: Commissioner Friedkin presented to the Mexican Commissioner the proposal for a permanent and effective solution contained in Annex B accompanying Washington Draft of June 30. He summarized orally the proposal, following in general the points covered in the attached out line drawn from the "United States Negotiating Position" memorandum (Annex A). In addition, he verbally provided the Mexican Commissioner with estimated figures on the probable minimum flows and range of salinity concentrations of sources of flows of the Colorado River at the northern international boundary anticipated in the immediate future, as follows: Probable Range Min. Flow in c.f.s. Concentration in p.p.m. 1) From Imperial Dam 500-600 800-900 2) Returns below imperial Dam (Except Wellton-Mohawk) 180-225 1450-1550 3) Returns from Welllton-Mohawk with River By-Pass Plan 200 Winter 3000-3500 Winter 300 Summer 3000-4000 Summer Commissioner Herrera Jordán listened most attentively and made personal and unofficial first observations in the sense that: 1. He regarded with some doubt the requirement in Alternative (a) of an even spread of greater rates of delivery in the remaining winter period. CONFIDENTIALEpson Perfection 4870 Photo, 400 dpi, 8 bit, 9,134,080 byte