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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3669 <br /> <br />description of the recommended or selected plan as determined by <br />the investigating agency. where determined, the updated <br />cost-effectiveness of each proposal is discussed as well as <br />anticipated reductions in salt concentrations at Imperial Dam. <br />Each summary is concluded by a statement regarding the current <br />status of the investigation. <br /> <br />Work activities during the remainder of the quarter centered <br />around an investigation of the significance of municipal and <br />industrial discharges to Colorado River salinity which was based <br />on information from the NPDES permit program. Initially, all <br />Colorado municipal and industrial discharges to the Colorado <br />River Basin were identified. Monitoring records for these <br />permits were then examined to determine the availability of flow <br />and total dissolved solids (TDS) data. Where this data was <br />available, the cummulative annual salt loading was then <br />calculated for the discharge point. Total flows, average TDS <br />concentrations, and total salt yields were then used to assess <br />the significance of these discharges relative to other sources of <br />salinity. The investigations and conclusions reached are <br />presented in memoranda dated November 30, 1981, and December 23, <br />1981. <br /> <br />Work in the next quarter will concentrate on the collection, <br />review, and analysis of salt loading information from several <br />sub-basins of the Colorado River within Colorado. The <br />information will be gathered from publiShed reports and from <br />personal interviews where possible. Conflicts and/or gaps in the <br />data will be determined. <br /> <br />gl <br /> <br />-2- <br />