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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Dtvision <br />• Rationale Amendment No. 4 - Paee 3. Permit No. CO-0021154 <br />__ E0005 = daily total recoverable maneanase affluent <br />concentration from discharge point 005, mall <br />E0007 = daily total recoverable maneanase affluent <br />concentration from discharge point 007, me/1 <br />ECtotal = daily total racoverabla maneanase affluent <br />concentrations from all discharges (001, 005, 0071 <br />The equation on the previous page is used to determine the total recoverable <br />maneanase concentration for [he three discharges for assessment of daily <br />maximum values. For determining [he 30-day avaraea concentration for total <br />racoverabla manganese, the average monthly concentrations from each of the <br />threw discharge points and the avaraea monthly flows from each of the throe <br />discharges should be used. <br />CYCC believes that this amendment, based upon Che WLA method, will eliminate <br />the occurrence of permit limit exceedances. Based upon the data supplied by <br />CYCC from January 1988 throu¢h Mav 15, 1989 theca would be few if env <br />violations of the tnstream water duality standards for total racoverabla <br />maneanase when the WLA method is used for da[~rmining the discharee <br />limitations. Only one month (April 1988) showed an exceedance of the 30-day <br />avaraea and daily maximum limitations for manganese. However, since [his <br />study was done on a worst case proiec[ed basis, CYCC feels that few if env now <br />exceedance would be occurine when the WLA method is utilized for determinin¢ <br />• the total racovarable maneanase limits. <br />In order to provide sufficient information to confirm the actual WLA-derived <br />concentrations for total racoverabla maneanase, CYCC is required [o submit for <br />each of the outfalls the actual flow data, the total racoverabla maneanase <br />data, and the daily and 30-day avaraea calculations. This summary should ba <br />attached to each monthly discharge monitoring report. <br />PERMIT CHANGES RESULTING FROM AMENDMENT 114: <br />Paee ~ Change to page: <br />lb, lc Added monitorine requirements for total <br />recoverable maneanase at discharee point 005. <br />la, if Deleted total racovarable maneanase limitation for <br />outfall 007, and added reportoring requirement for <br />total recoverable manganese at this discharee <br />point. <br />lf(i), lf(fi) Delzted total recoverable maneanase limitation for <br />outfall OOI, and added reportorine requirement for <br />total racoverabla maneanase at this discharee <br />point. <br />• <br />