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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />• Rationale - Page 3. Permit No. CO-0027154 <br />V. DISCUSSION OF AMENDMENT: <br />The permit[ee 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 for <br />five discharge points. Based upon review by the Division, a correlation <br />was established between these two parameters. Thus, monitoring for this <br />permit is now specified for salinity as electrical conductivity for <br />discharge points 001, 002, 003, 004, 005, 006, 007, and 008. Thus, <br />pages la, lb, lc, ld, le, lf, lf(i), lf(ii), lg, and lh of the permit <br />have been modified accordingly. <br />For outfalls 001 and 007, a 5000 mg/1 Total Dissolved Solids limitation <br />has previously been applicable. With the change from Total Dissolved <br />Solids to Electrical Conductivity, a change in this limitation is also <br />appropriate. From correlation equations developed for three outfalls of <br />this permit, the values of Electrical Conductivity which correlate to <br />• 5000 mg/1 Total Dissolved Solids were: <br />Outfall 001: 6485 micromhos/cm Electrical Conductivity <br />Outfall 005: 5337 micromhos/cm Electrical Conductivity <br />Outfall 007: 5146 micromhos/cm Electrical Conductivity <br />Thus, an Electrical Conductivity limitation of 6485 micromhos/cm is no:+ <br />the limit for discharge point 001, and 5150 micromhos/cm is the limit <br />for discharge point 007,. These changes have been made for outfalls ~:OL <br />and 007 on pages le, lf, lf(1), and lf(ii) of the permit. <br />Ln addition, corrections were made to the references to the burden ~~ <br />proof requirements (in Part I.A.1.7 of the permit) on the applicabl.~ <br />permit pages. <br />Since this is a minor modification, no public notice is required. <br />Don Holmer <br />August 23, 1990 <br />• <br />