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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />lmendmem No. 2 -Rationale -Page 5, Permit No. CO-0000221 <br />4) General lnfomtation: The permirrce should read the WET testing sections ojPart I.B.S. of the permit carefully. <br />Zhe permit outlines the test requiremcros and the required jollow-up actions the permitree must take to resolve <br />a loziciry incidem. The permittee should read, along with the dacumems listed in Parr I.B.S. (a) of the permit, <br />the Colorado Water OualiN Control Divisiors Biomonitorin2 Guidance Document. dated July 1, 1993. This <br />document outlines the criteria used by the Division in such areas as granting relief from WET testing, modifying <br />test methods and changing test species. The permitree should be aware that some of the conditions outlined <br />above may be subject to change ijrhe jaciliry experiences a change in discharge, as outlined in Parr II.A.1 of <br />the permit. Such clurnges shall be reported ra the Division immediately. <br />B. Monitoring <br />I. Eliluent Monitorinz: Effluent monitoring will be required as shown in Table Vl-3. Refer ro the permit for locations of <br />monitoring points. <br />Table VI-3 -Monitoring Requirements jot Outja(Is 010 and 011 <br />,.... <br />Patnmeter .:. ::. Measurement I'}eouency Samole TWpe <br />\J <br />Flow, MGD Weekly Instantaneous <br /> or Cominuous <br />TSS, mg/f Monthly Grab <br />Total Iron, mg/P Momh[y Grab <br />Settleable Solids, mP/P Momhly Grab <br />Oil and Grease, mg/P Weekly Visual <br />pH, s.u. Weekly In-situ <br />Whole Effluent Toxicity, Acute Ouarter(y Grab <br />The permittee should note that the sample type jot pH has been changed from 'grab' to "in-situ ". This is simply a <br />clarification, not a significant change. Approved methodology states that samples be awlyzed as soon as possible and <br />practical after collection. Some permitrces have not been aware ojthis and have had a contract laboratory analyze for <br />pH with other parameters, sometimes one ar more days later. This does not assure reliable and represemative results <br />since the pH can change while the sample sits in the sample bottle. <br />VII. PERMIT PAGES AFFECTED BY THIS AMENDMENT <br />This amendmeN results in amending ojpermit pages Ib, !c, Id, le, Ij, Ig, IL, IL(i), IL(ii) and IL(iii). In addition, two <br />new figures are added, Figures 4 and 5, ro be on pages Ip and Iq. Figure 4 is an overall location map showing the Seneca <br />II mine, the Seneca I/ West mine and the Yoast mint, as well as the surrounding area including the Town of Hayden. Figure <br />5 shows the new outfal(s OIO and 011. <br />Jon C. Kubic <br />April 11, 1996 <br />VII/. PUBLIC NOTICE COMMENTS <br />• <br />The only commems received were from the permitree. Their only comments concerned change ojfacility comacts. These <br />contacts have been changed in section II. of this rationale. <br />Jon C. Kubic <br />June 11, 1996 <br />