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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />• Rationale Amendment No. 4 - Pace 3. Permit No. CO-0021154 <br />_ E0005 = daily total racoverabla maneanes~ affluant <br />concentration from discharea point 005, me/1 <br />E0007 = dally total recoverable manganese affluant <br />concentration from discharea point 007, me/1 <br />ECtotal = daily total recoverable manganese affluent <br />concentrations from all discharges (001, 005, 0071 <br />Tha equation on the previous pa¢a is used to determine the total recoverable <br />maneanasa concentration for the three dischareos for assessment of daily <br />maximum values. For detarminine the 30-day averaee concentration for total <br />racoverabla manganese, the avara¢a monthly concentrations from each of the <br />three discharea points and the averaee monthly flows from each of the three <br />discharges should ba used. <br />CYCC believes that this amendment, based upon the WLA method, will eliminate <br />the occurrence of permit limit exceedances. Based upon the data supplied by <br />CYCC from January 1988 throueh May 15, 1989 there would be few if any <br />violations of the instream velar quality standards for total recovarabla <br />maneanasa when the WLA method is used for detarminine the discharea <br />limitations. Only one month (April 19881 showed an exceedance of the 30-day <br />averaee and daily maximum limitations for maneanasa. However, since this <br />study was done on a worst case oroiected basis, CYCC feels that Eew if env new <br />axceedance would ba occuring when the WLA method is utilized for datarminin_e <br />[he total recoverable manganese limits. <br />In order to provide sufficient information to confirm the actual WLA-derived <br />concentrations for total racoverabla maneanasa, CYCC is required to submit for <br />each of the outfalls the actual flow data, the total racoverabla maneanasa <br />data, and [he daily and 30-day averaee calculations. This summary should be <br />attached to each monthly discharea monitoring report. <br />PERMIT CHANGES RESULTING FROM AMENDMENT 114: <br />Page U Chanea to page: <br />lb, lc Added monitoring reauiremen[s for total <br />recovarabla maneanasa at dischar¢e point 005. <br />la, if Deleted total racovarable maneanasa limitation for <br />outfall 007, and added raportorine reauirament for <br />total racovarable man_eanase a[ this dischar_a <br />point. <br />lf(i), if(ti) Deleted total racoverabla maneanasa limitation for <br />outfall 001, and added reoortorine reauirament for <br />total recoverable maneanasa at this disc har¢e <br />point. <br />• <br />