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<br />PART I <br />Page lk of 14 <br />Permit No. CO-0027154 <br />B. MONITORING REQUIREMENTS <br />1. Frequency and Sample Type For Outf alls 001 005 007 and 019 (continued) <br />Weekly total recoverable manganese concentrations shall be reported as the result of the <br />following calculation. The 30-day average concentration shall be determined using a normal <br />arithmetic mean of all weekly results per calendar month. <br />M019 = ~QOO1)(MOO1) + (O005)(M005) + (O007)(M007) <br />Q019 <br />Where: M019 = Calculated flow weighted mean concentration for outfall 019; <br />0001 Maximum daily flow during period for outfall 001; <br />M001 = Effluent concentration for outfall 001; <br />Q005 = Maximum daily flow during period for outfall 005; <br />M005 = Effluent concentration for outfall 005; <br />Q007 Maximum daily flow during period for outfall 007; <br />M007 Effluent concentration for outfall 007; <br />Q019 = Combined maximum daily flow for outfalls 001, 005 and 007. <br />2. Frequency and Sample Type For Outfalls 002, 003 004, 006, 008, 009 010 016 017 and <br />020 <br />In order to obtain an indication of the probable compliance or non- compliance with the <br />effluent limitations specified in Part I.A.2., the permittee shall monitor all effluent <br />parameters at the following frequencies, the results to be reported on the Discharge <br />Monitoring Report (See Part i, Section B.3.): <br />a) Outfalls 002, 003, 004, 006 and 008 <br />Effluent Parameter Measurement Frequency d/ Sample Type e/ <br />Flow, MGD Weekly Instantaneous <br /> or Continuous <br />Total Suspended Solids, mg/1 Monthly Grab <br />Total Iron, mg/1 Monthly Grab <br />Oil and Grease, mg/1 Weekly Visual f/ <br />pH, s.u. Weekly Grab <br />Settleable Solids, ml/1 j/ Monthly Grab <br />Electrical Conductivity, umho/cm Quarterly Grab <br />b) Outf alls 009, 010, 016 and 017 <br />Effluent Parameter Measurement Frequency d/ Sample Type e/ <br />Flow, MGD Weekly Instantaneous <br /> or Continuous <br />Oil and Grease, mg/1 Weekly Visual f/ <br />pH, s.u. weekly Grab <br />Settleable Solids, ml/1 i/ Monthly Grab <br />Electrical Conductivity, umho/cm Quarterly Grab <br />Sampling for compliance with the monitoring requirements specified above shall be <br />performed at the following locations: flow measuring devices at the authorized outfalls <br />(002, 003, 004, 006, 008, 009, 010, 016 and 017) from the various ponds to State waters. <br />See Part I.D. for Footnotes <br />Amendment No. 4 Issued Effective <br />