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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 />.J 709 <br /> <br />TO: <br /> <br />Dan Law <br /> <br />U"'I' j"" <br />. ,,,' f::: (,-; ), <br />.~ "- l1.U 1J. <br /> <br />FROM: <br /> <br />Dean Stindt <br /> <br />DATE: <br /> <br />January 4, 1982 <br /> <br />((s,.b{',,~f 'Ve<.<u"bcr Z.3,1'it:>i) <br /> <br />SUBJECT: Significance of NPDES Municipal Discharges to <br />Colorado River Salinity <br /> <br />The subject analysis considers all municipal discharges to <br /> <br />the Colorado River Basin through the NPOES permit program. Of <br />the 75 permits involved, annual salt loading was determined in 28 <br />cases. Twenty-nine permittees are not m6nitoring for salinity, 8 <br /> <br />permittees report no discharge for the past several years, and <br /> <br />monitoring records for 10 permits are lacking information that <br /> <br />would allow an accurate assignment of annual salt loading. Many <br /> <br />of the 29 permits for which salinity is not being monitored were <br /> <br />issued several years ago and are currently being considered for <br /> <br />re-issuance. The new permits will stipulate salinity monitoring. <br /> <br />Annual salt loading for several permits was determined on <br /> <br />the assumption that the TDS concentration of intake (raw) water <br /> <br />was 200 mg/L in cases where the permittee had failed to report <br /> <br />this information. These salt loading determinations are marked <br /> <br />by an asterik.Vhere monitoring records were only slightly <br /> <br />incomplete, averages were used to fill the gaps. <br /> <br />-42- <br />