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<br /> <br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />• Rationale - Page 2. Permit No. CO-0036684 <br />III. RECEIVING STREAM: <br />A. Identification, Classification and Standards <br />1. Identification: The discharge goes to Fish Creek (Segment 13b), <br />which is tributary to Trout Creek. Trout Creek is tributary to <br />the Yampa River. <br />2. Classification: Segment 13b is classified for the following <br />uses: Recreation, Class 1; Aquatic Life, Class 1 (Cold); <br />Agriculture. <br />3. Numeric Standards: The standards which have been assigned in <br />accordance with the above classifications can be found in 3.3.0 <br />Classifications and Numeric Standards for the Upper Colorado <br />River Basin and North Platte River (Planning Region 12) (5 CCR <br />1002 -8 ), as amended July 6, 1988. It should be noted that this <br />facility does not discharge pollutants which are limited by <br />water quality standards with the exception of pH. <br />B. Receiving Water Data <br />• 1. Stream Low Flow: Not Applicable; effluent limitations are not <br />flow based. <br />IV. PURPOSE OF AMENDMENT: <br />The purpose of this amendment (Amendment No. 2) is to change monitoring <br />for salinity from total dissolved solids to electrical conductivity for <br />discharge point 001. <br />V. DISCUSSION OF AMENDMENT: <br />The permittee has requested this amendment in a letter dated June 4, <br />1990 from Marcus A. Middleton, Environmental Specialist with Cyprus <br />Yampa Valley Coal Corporation. <br />Using data from 1979 through 1989 for three different permits <br />(COG~50013, CO-0027154, and CO-0036684) which have historically <br />experienced regular discharge, the permittee reviewed and established <br />relationships between field conductivity and total dissolved solids <br />(TDS) for five discharge points. Based upon review by the Division, .3 <br />correlation was established between these two parameters. For this <br />permit, a TDS value of 3000 mg/1 correlates to 2577 micromhos/cm for <br />electrical conductivity. <br />n <br />LJ <br />