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<br />l\) <br />~ <br />t- <br />O) <br /> <br />reason for this salt load reduction in this reach has not yet <br /> <br />been detemined, it appearst.hat for the 1955 period it is <br />mostly due to data errors. A mass balance analysis of inflow <br />to and outflow from Lake Powell for the period 1963 through <br />1976 results in a net loss of salt, indicating that some <br />precipitation of salt is occurring in the Lake. <br />Baseline Values <br /> <br />The concept of baseline or benchmark values was intro- <br /> <br /> <br />duced at the December 8-10, 1974 Work Group meeting in San <br /> <br />Francisco, as an alternative to state-line standards as pro- <br />posed by EPA. Baseline values are a relationship between <br />salinity and flow at select'(3d sites. There is no intent to <br /> <br />make baseline values standards or are they to be considered <br />or interpreted as standards for salinity. <br /> <br />The 1975 Forum report called for the development of <br /> <br />baseline salinity values for monitoring points on the main- <br /> <br /> <br />stem and major tributaries as part of the process of identi- <br /> <br /> <br />fying and evaluating progress in salinity control. The 1978 <br /> <br /> <br />Forum report indicated that the baseline values would be <br /> <br />developed by the Forum in 1979. <br /> <br />Because salinity at any point is influenced by a number <br /> <br />of factors, it was concluded that baseline values would be <br /> <br />represented by a salinity range rather than a single value, <br /> <br />This range is represented by a broad band superimposed on a <br />best-fit curve of the relationship between annual salinity <br />and flow at a given station, The relationships developed are <br /> <br />25 <br />