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<br />o <br />CJl <br />w. <br />o <br /> <br />Salinity concentrations for 1987 (provisional) were 206 <br />mg/l below the numeric criteria at Hoover Dam, 209 mg/l belQw <br />the criteria at Parker Dam, and 266 mg/l below the criteria <br />at Imperial Dam. Based on the current level of salinity in <br />the lower mainstem, the high level of reservoir storage, the <br />volume weighted salinity of the water in storage and the <br />present level of water USe in the Basin, it is clear that the <br />criteria will not be exceeded during the next twelve-month <br /> <br />period . <br />Al though current salini ty levels in the Color ado River <br />System are below the criteria level, studies by the Forum and <br />Reclamation show that' salinity concentrations will again <br /> <br />increase. <br /> <br />If planned salinity control measures are <br /> <br />implemented, the man caused increases in salinity can be held <br />within the prescribed numeric criteria through the year 2010, <br />based on average water supply conditions. While the levels <br />of salinity concentrations will increase slowly, efforts to <br /> <br />control salinity take many years to accomplish. <br /> <br />Once <br /> <br />completed, a salinity control project will take a number of <br />ye~rs (4-5) for the full impact of ~he control measures to <br />show results at Imperial Dam. Planning and implementation of <br />the salinity control program also requires considerable time <br />because of the many uncertainties associated with the complex' <br />and unique technologies required for salinity control. <br />Therefore, it is imperative that. the salinity control program <br />as Set forth in the 1987 Review be carried out as scheduled. <br /> <br />-26- <br />