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Last modified
1/26/2010 12:29:30 PM
Creation date
10/11/2006 10:12:50 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8272.100.60
Description
Colorado River Basin Salinity Control Forum
Basin
Colorado Mainstem
Water Division
5
Date
6/1/1996
Author
CRBSCF
Title
1996 Review - Water Quality Standards for Salinity - Colorado River System
Water Supply Pro - Doc Type
Report/Study
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<br />~ <br />f-' <br />o <br />o <br /> <br />CHAPfER 3 - WATER QUALITY STANDARDS FOR SALINITY <br /> <br />Overview of Standards <br /> <br />On December 18, 1974, the EPA promulgated a regulation (40 CFR 120; see Appendix A) <br />which set forth a basin-wide salinity control policy for the Colorado River Basin. This regulation <br />also established a standards procedure, and required the Colorado River Basin states to adopt and <br />submit to the EPA water quality standards for salinity, including numeric criteria and a plan of <br />implementation, consistent with the policy stated in the regulation. The Basin states, acting <br />through the FOrum, initially responded to this regulation by developing and submitting to the EPA <br />a report entitled Water Quality Standards for Salinity IncJudini Numeric Criteria and Plan of <br />Implementation for Salinity Control - Colorado River System dated June 1975. Since the states' <br />initial adoption, the water quality standards have been reviewed every three years (1978, 1981, <br />1984, 1987, 1990, and 1993) as required by Section 303(c)(1) of the Clean Water Act. This <br />report documents the seventh triennial review conducted by the Forum as required by law, <br /> <br />In 1975, the Forum proposed, the states adopted, and the EPA approved, water quality <br />standards, including numeric criteria and a plan of implementation to control salinity increases. <br />The Forum selected three lower Colorado River mainstem stations as being appropriate points in <br />the Colorado River system at which numeric criteria should be established as required by the 1974 <br />regulation. These stations are located at the following points on the Colorado River: (1) below <br />Hoover Dam; (2) below Parker Dam; and (3) at Imperial Dam. The plan of implementation, <br />developed in 1975 by the Forum and participating federal agencies, was designed to ensure <br />compliance with the water quality standards for salinity. During each triennial review, the plan <br />of implementation has been updated to ensure continuing compliance with the standards. <br /> <br />The standards require that a plan be developed that will maintain the flow-weighted <br />average annualsa1inity at or below the 1972 levels while the Basin states continue to develop their <br />compact-apportioned water supply. The plan of implementation was not established to reduce the <br />salinity of the river below levels that were caused by natural variations in river flows or human <br />activities prior to 1972, but to offset the effects of water resource development in the Colorado <br />River Basin after 1972. <br /> <br />The Colorado River water quality standards for salinity and the approach taken by the <br />Basin states in complying are unique. During the course of each triennial review, the Forum <br />projects the Basin states' use of compact-apportioned waters and the resulting changes in salinity. <br />The salinity projections are based on the use of the long-term mean water supply of 15 million <br />acre-feet per year. The plan of implementation is revised as necessary to ensure that the numeric <br />criteria will be maintained. <br /> <br />The regulation specifically stated that salinity control was to be implemented while the <br />Basin states continue to develop their compact-apportioned water. Historically, the Forum <br />designed the plan of implementation to maintain the numeric criteria for a period of 15-20 years <br /> <br />3-1 <br />
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