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Last modified
1/26/2010 2:27:09 PM
Creation date
10/12/2006 2:18:51 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8270.100
Description
Colorado River Basin Water Quality/Salinity -- Misc Water Quality
Basin
Colorado Mainstem
Water Division
5
Date
1/1/1985
Author
USDOI
Title
Quality of Water - Colorado River Basin - Progress Report No. 12 - January 1985 -- Part 1 of 2 -- Title Page through Part IX - page 128
Water Supply Pro - Doc Type
Report/Study
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<br />. <br /> <br />~"'. <br />l'') <br />~ <br /> <br />~::~ <br /> <br />. <br /> <br />. <br /> <br />PART I <br /> <br />INTRODUCTION <br /> <br />criteria and a basinwide plan of implementation for salinity control. <br />The Basin States held public meetings on the proposed standards as <br />required by the enacting legislation. The Forum recommended that the <br />individual Basin States adopt the report, Water Quality Standards for <br />Salinity Including Numeric Criteria and Plan of Implementation for <br />Salinity Control, Colorado River System. The proposed water quality' <br />standard called for maintenance of flow-weighted average total dissolved <br />solids (TDS) concentrations of 723 mg/L below Hoover Dam, 747 mg/L below <br />Parker Dam, and 879 mg/L betow Imperial Dam. Included in the plan of <br />implementation were four salinity control units and possibly additional <br />units, the application of effluent limitations, the use of saline water <br />whenever practicable, and future studies. The standards are to be <br />reviewed at 3-year intervals. All of the Basin States adopted the 1975 <br />Forum-recommended standards. <br /> <br />The Colorado River Basin Salinity Control Act of 1974 (Public <br />Law 93-320) provided the means to comply with United States obligations <br />to Mexico which included as a major feature a desalting plant and brine <br />discharge canal. These facilities will enable the United States to <br />deliver water to Mexico having an average salinity no greater than 115 <br />parts per million (ppm) + 30 ppm (United States count) over the annual <br />average salinity of Color~do River waters at Imperi~l Dam. The act also <br />authorized construction of 4 salinity control units and the expedited <br />planning of 12 other salinity control projects above Imperial Dam as <br />part of the basinwide salinity control plan. <br /> <br />In 1984, the Forum reviewed the salinity standards which were <br />adopted by all of the 7 Basin States and recommended the construction of <br />3 of the 4 salinity control units and 10 of the 12 projects identified <br />in the 1974 Act, the placing of effluent limitations on industrial and <br />municipal discharges, and the reduction of the salt loading effects of <br />irrigation return flows. The plan also called for the inclusion of <br />water quality management plans to comply with Section 208 provisions <br />after the adoption of the plans by the States and approval by EPA. It <br />also contemplated the use of saline water for industrial purposes and <br />future salinity use control methods. <br /> <br />The 98th Congress passed HR-2790 which amends Public Law <br />93-320, the Colorado River Basin Salinity Control Act. The President <br />signed the bill on October 30, 1984, and the legislative initiative <br />has become Public Law 98-569. This action is the culmination of a sig- <br />nificant 2 l/2-year effort by the Colorado River Basin States working in <br />close cooperation with the involved Federal agencies to amend. enhance, <br />and update the 10-year-old Salinity Control Act. <br /> <br />The Colorado River Basin Salinity Control Act, as now amended, <br />provides the authority for the pursuit of salinity control measures, <br />primarily by the Department of the Interior and the Department of Agri- <br />culture, that will allow for the necessary salinity controls on the <br />river to be put in place through the year 2000. It will insure, if <br />implemented, the compliance with the numeric criteria at least through <br />the year 2005. <br /> <br />5 <br />
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