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(:) industrial uses which are expected to add less salts to the system, and other '. -~ possible alternativeso to- 00 .- -.1 Numerical Standards for the Colorado River The EPA has concluded that P.L. 92-500, "Federal Water Pollution Act Amend- ments of 1972", mandates the establishment of numerical standards for the Colorado River. In March 1973, the Colorado River Basin states were requested by letters from the EPA to amend their water quality standards for interstate waters of the Colorado River so as to include the Conclusions and Recommendations of the Seventh Session of the Enforcement Conference. This action was required so as to place the states in compliance with P.L. 92-500. The Act also specifies that standards are to be reviewed and revised as necessary at 3-year intervals, and, in keeping with the requirement, the March letters also requested the states to undertake "tudies and negotiations to develop numerical salinity standards and a detailed plan of implementationo On September 10, 1973, the Regional Director of the EPA approved California's grant application for funds pursuant to P.L. 92-500, but provided that about one half could be withheld subject to the completion of a number of conditionso The condition that concerns Colorado River salinity is the requirement to estab- ,ish, by December 31, 1973, procedures which will lead to adoption of numerical criteria for total dissolved solids in the Colorado River System by October 18, 1975. The letter to California stated that identical conditions have also been ;lnposed on the grants to Arizona and Nevada. It is understood that the other EPA cegions are to impose similar conditions on the four Upper Basin states. The Getting of any numerical standards will require extensive coordination and coop- "ration betvleen the states. Installation of Tile Drains In ord("r' to combct the high salj,ll.ity of C01o:<:-.:lcO River 'i'TatE"r app~i.~r1. to th';Lr 16