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Part 1 <br />Page 4 of 21 <br />Permit No.: CO-0046540 <br />B. N(ONITORING REQUIREMENTS <br />1. Frequency and Sample Type <br />In order to obtain an indication of the probable compliance or noncompliance with the effluent (imitations specified in <br />Part LA.I, the permittee shalt monitor alt effluent parameters at the following frequencies. Such monitoring will begin <br />immediately and last for the life of the permit unless otherwise noted. The results of such monitoring shall be reported <br />on the Dischazge Monitoring Report farm (See Part I.E.) <br />a. Outfall 001 and Outfall 002 <br />Parameter Measurement Fre uency Sam le Tye '~ d iv <br />Flow, MGD Monthl Instantaneous or Continuous <br />Total Sus ended Solids, m !1 Monthl Grab <br />Oil and Grease, m /I Monthf Visual i/ <br />H, s.u. Monthl Grab <br />b. Outfall MONl <br />Parameter Measurement Fre uenc Sam le T e v <br />Aluminum, fret, u /I Monthl Grab <br />Arsenic, fret, u /1 Mont}tl Grab <br />Cadmium, PD, u /1 Monthl Grab <br />Chromium <br />Trivalent, fret, ug/I <br />Hexavatent, Dis, u /I <br />Monthly <br />Monthl <br />Grab <br />Grab <br />Co er, PD, u /1 Monthl Grab <br />Iron, fret, u /1 Mon[hl Grab <br />Cyanide, weak acid dissociable, <br />m /1 Monthly Grab <br />Lead, PD, u /I Monthl Grab <br />Man anese, PD, u /1 Mon[hl Grab <br />Mercu , total, u /I Monthl Grab <br />Nickel, PD, u /( Monthl Gtab <br />Selenium, PD, u /1 Monthl Grab <br />Silver, PD, u /1 Monthl Grab <br />Zinc, PD, u /1 Monthl Grab <br />Self-monitoring sampling by the permittee for compliance with the monitoring requirements specified above shall be <br />performed at the following location(s): Outfalls 001, 002 and MONl, prior to the discharge mixing with any other <br />discharge, of entering Fourmile Creek.. <br />If the pertttittee, using the approved analytical methods, monitors any parameter mare frequently than required by this <br />permit, then the results of such monitoring shall be included in the calculation and reporting of the values required in the <br />Dischazge Monitoring Report Form (DMRs) or other forms as required by the Division. Such increased frequency shall <br />also be indicated. <br />i/ This parameter is subject to "Noncompliance Notification" requirements of Part ILA.4.b.(4) of this permit for <br />violations of the Daily Maximum limi[ation for this parameter. <br />c. OIl and Grease Mottitorine <br />For every outfall with oIl and grease monitoring, in the event an oil sheen or floating oil is observed, a grab sample <br />shall be collected, analyzed, and reported on the appropriate DMR. In addition, corrective action shall be taken <br />immediately to mitigate the discharge of oil and grease. A description of the corrective action taken should be <br />included with the DMR. <br />MODIFICATION ISSUED AND EFFECTIVE MARCH 27 2006 EXPIRATION MARCH 31 2011 <br />