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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 />37J8 <br /> <br />Assuming that 10,000 tons of sal t would have to be removed <br />from the river system in order to reduce the TDS concentration at <br />Imperial Dam by 1 mg/L, the best case achievement of zero salt <br />discharge for all 28 municipal dischargers considered would only <br />reduce the salt concentration at Imperial Oam hy .7 mg/L. <br />relative to other sources of salinity to the river, Colorado <br />municipal discharges through the NPDES program appear to be <br />insignificant. Due to the relatively small amount of salt (7,249 <br />tons) and the relatively low salt concentrations (357 mg/L) <br />associated with the municipal discharges, the potential for <br />significantly improving Colorado River water quality with better <br />control over municipal discharges appears low. The cost- <br />effectiveness of achieving zero discharge treating such low <br />concentrations of TOS is extremely poor. <br /> <br />Although this investigation considered salt loading only <br /> <br /> <br />from discharges for which the appropriate information was <br /> <br /> <br />available, it serves well to assess the relative importance of <br /> <br /> <br />municipal discharges to the Colorado River system. <br /> <br />DRS/gl <br /> <br />-51- <br />