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. . w ~ Numeric criteria and plan of implementation. The major output W of the Forum has been preparation of Water Quality Standards for Salin- ~ ity Includin~ Numeric Criteria and Plan of Implementation in 1975 and a revision in 1978. Allor parts of these documents have been adopted as water quality regulations by each of the seven Basin states. lVhile the numeric criteria remain constant,6 the federal and nonfederal mea- sures which make up the plan of implementation have evolved as know- ledge about the salinity problem increases. Major components of the plan include construction and operation of those salinity control units found feasible and authorized by Title II of P.L. 93-320; placing of ef- fluent limitations on industrial and municipal discharges; and inclusion of the sections of the 208 Water Quality Management Plans that deal with salinity control as part of the Forum plan. The document also includes agricultural improvements in on-farm and irrigation system practices, use of saline water for industrial purposes, and recommended studies of both structural and nonstructural measures to control salinity. Over the years of its active participation in addressing salinity-control issues, the Forum has gained a certain influence over the actions of federal agencies and has acted as a regional unit to ob- tain maximum salinity control benefits for the seven states as a nation- al obligation. At the same time, through discussion at Forum meetings and the research and liaison activities provided by the Forum work group, the Forum has encouraged each state to adopt the Plan of Implementation as water quality regulation and to enact programs and'po1icies peculiar to each state which might affect salinity control. For example, Cali- fornia and Arizona have both arranged for power plant cooling water de- rived from saline return flow, and Clark County, Nevada (Las Vegas area), has proposed a number of reuse projects to alleviate both water shortages and salt buildup. Industrial reuse policy, On September 11, 1980, the Forum \ adopted a policy calling for the exercise of all feasible measures to \ achieve the use of brackish and/or saline water for industrial purposes. \ ~~~~ ~~t~a~~ ~~~.~~~e~_,,-i~~:~~\I!Y~~~S~;P:~:'~_~sJ:~!itr;:~;~:;~:~a.r::~- .- ~I"~_enj;iar::--stat_~_acUll.itY_:l,P. tl1i'_..~1.inity control program. Califor- nia, Nevada, and Wyoming all have similar.poJ:i-c-t-es.-inforfua1Ty in effect while most of the other states have instances of industrial use of sa- line water. Since much of the brackish and/or saline water referred to in the policy is collectable from irrigation return flow (and a few other uses), the policy also represents a major endorsement of planned reuse, 6Colorado River Basin Salinity Control Forum, Water Quality Stan- dards for Salinity Including Numeric Criteria and Plan of Implementation for Salinity Control (n,p,), June 1975; revision, August 1978. II-7 ,