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<br />. <br /> <br />. <br /> <br />Title I provides the means of accomplishing the requirements of <br /> <br /> <br />Minute 242 which requires that the water delivered to Mexico be no <br /> <br /> <br />more than 115 ppm ~ 30 ppm higher in salinity than the Colorado River <br /> <br /> <br />water arriving at Imperial Dam upstream of the United States-Mexican <br /> <br /> <br />border (ppm is a measure of the parts per million concentration of <br /> <br />total dissolved solids, an indicator of salinity concentration and <br /> <br /> <br />is essentially equivalent to concentrations expressed in mg/L). <br /> <br />Title II of the act provides for programs to control the salinity of <br /> <br /> <br />the Colorado River upstream from Imperial Dam to meet the salinity <br /> <br />standards established by the basin states. It also authorized the <br /> <br />construction of four salinity control units: Paradox Valley Unit, <br /> <br />Grand Valley Unit, Crystal Geyser Unit, and Las Vegas Wash Unit. <br /> <br />Title II also authorized and directed the Secretary of the Interior to <br />expedite the completion of the planning reports listed in the <br /> <br />Secretary's Report, "Colorado Ri ver Water Qua 1 i ty Improvement Program, <br /> <br />February 1972" which is essentially the Colorado River Water Quality <br /> <br /> <br />Improvement Program. The Water Quality Improvement Program is a <br /> <br /> <br />general investigation program developed in early 1971 by the Water and <br /> <br />Power Resources Service which includes the PVID Unit. <br /> <br />Previous and Related Investigations <br /> <br />The PVID Unit was included as part of a water quality study of the <br /> <br />entire Colorado River system by the Federal Water Pollution Control <br /> <br />Administration (FWPCA) between 1963 and 1970. Joint investigations <br /> <br /> <br />of the salinity problem and possible control measures werr~~!fd <br /> <br />2 <br />