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COLORADO DEPARTMENT OF HEALTH, R'attr Quality Control Division <br />Rationale -Page 2. Permit No. CO-0029955 <br />Ill. PURPOSE OF AMENDMENT.• <br />T7u permittee has an e,(Jlutnt limit jor told phosphorus and utilizes a trcauntnt prouss that is mast e,(J"icient at <br />a pH ojslightly above 6.0 s.u.. Tlu pernduee can more economically that jor phosphorus jf the effluent limit <br />could be set d a pH of 6.0. <br />By amendnunt number 2 to tlu txisdng permit, the effluent pH limit was changed to a range of 6.3 to 9.0 <br />standard snits. Since that armendment, the water quality limits jor Soda Creek have been lowered to a mnge of <br />6.0 to 9.0 standard units. Due to the dihdion avorlablt in Dillon Reservoir and the normally high pH in the <br />reservoir, a discharge of 6.0 pH In Soda Creek should not lower the pH ojlhQon Reservoir to a level below the <br />6.5 minimum pH estabdshed by tht waur quality standards jar t/u nurvdr. <br />A bridge txists across tlu Soda Creek Amt ojlXRon Reservoir below tlu discharge point and Just above the <br />cogJluenee with the Snakt River. Although the division will not require insercam monitoring, the phmitlee may <br />wish to measure pH in Dillon Reservoir d this porn! to prove the the wrier quality standard Ls not being <br />violated. <br />Page Ic of the permit will be changed to reflect a minimum e,(Jluent limit jor pH of 6.0 standard units. <br />John R. Blair, P.B. <br />March 3l, 1994 <br />