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<br />t''' <br />CJ1 <br />l\J <br />N <br /> <br />years before any significant effects are felt at the three <br />lower mainstem stations. <br /> <br />.. <br /> <br />,- <br /> <br />Salinity concentrations for 1984 (provisional) are about <br />l12 mg/l below the numeric criteria at Hoover Dam, 105 mg/l <br />below the criteria at Parker Dam, and at Imperial Dam, about <br />209 mg/l below the numeric criteria. Considering current <br />levels of salinity in the lower mainstem, the high level of <br /> <br />reservoir storage and volume weighted salinity of the water <br />in storage as well as the present level of water demand in <br />the Basin, it is clear that the criteria will not be exceeded <br /> <br />during the next twelve-month period. <br />Studies by the Forum and Reclamation show that salinity <br /> <br />concentrations will increase unless salinity control measures <br /> <br />are implemented. In many cases, it takes more than 10 years <br />for the full impact of control measures to show results at <br /> <br />Imperial Dam. <br /> <br />The planning and implementation of the <br /> <br />salinity control program requires a considerable period of <br /> <br /> <br />time because of the many uncertainties associated with the <br /> <br />complex and unique technologies required for salinity <br />control. Therefore, it is imperative that the salinity <br />control program be carried out as expeditiously as possible. <br /> <br />. ,- <br /> <br />. <br />. <br /> <br />. ., <br /> <br />-46- <br />