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COLORADO DEPARTMEM OF HEALTH, Water Quality Control Division <br />Rationale -Page 4, Permit No. CO-0034142 <br />Allowable Instrecvn Total Ammonia <br />In order to insure the inrtrtam standard for un-ionized ammonia will be protected, ejjluent limitations jot rota! <br />anunonia were valuated. To do sa, the Division standardty uses the Colorado Anvnonia Model when <br />sufficiem stream and ejlluent pH and temperature data arc available. In this case, such data were not <br />available. It wat• therefore necessary to ust the results of regional analyses that have been performed for the . <br />emire State of Colorado. <br />From these analyses, the following Jnasimran allowable instream total amtnonio concentrations below the <br />discharge have b~:en estimated. <br />Table /I/ - 2 - A4aximum AUowabk /nsJnam Total Ammonia, mg/l as 1V (Chtronic Conditions) <br />16fonth... ..: . <br />Concenttn7ton, :ing/1.:';::.:..'.:: ; Montle::: ':: ::...':Concenttntion;: mg/1: <br />Jan 6.0 Jul 1.2 <br />Feb 4.8 Aug 1.2 <br />Mar 2.8 Sep 1. <br />Apr 2.0 Oct 1.1 <br />May 1. S Nov 1.8 <br />Jun /.3 Dcc 5.1 <br />E•[fluent limitatiortr based upon the allowable instream rota! ammonia concentrations lLrted in the above table <br />are discussed in : ection VLA. <br />B. Receiving Water Data <br />1. uali -Water quality data for the Williams Fork River are available from sampling conducted by the <br />permiaee in the application for renewal, dated June 29, 1990. The samples were taken on May 31, 1990. <br />The data are shown in Table 77/-3. <br />