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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMEM', Water Quality CoNrot Division Rationale -Page I5, Permit No. CO-0100012I Table VI-IO -Monitoring Requinmerus jot Outfalls 000• and 008• Paramuer Measuroment Fiegrtertcy-_ SampltType Flaw, MGD Weekly Instantaneous or Conrinuous TSS, mg/P Moinhly Grab Total Recoverable Iron, Monthly Grab mg/P Settleable Solids, mPlP Monthly Grab Oil and Grease, mg/P Weekly Visrtal a/ pH, s.u. Weekly In-situ TDS, mg/P Quanerly Grab Whole EJfiuein Toxicity, Qtmnerty** 3 Grabs/I'est Chronic Table VI-II -Monitoring Requirements jot Outfall 009' Parameter- Measurement Frequency :, : Sample Type Flow, MGD Weekly Instainaneous or Continuous TSS, mg/P Monthly Grab • Total Iron, mg/P Monthly Grab Settleable Solids, mP/P Monthly Grab Oil and Grease, mg/P Weekly Visual a/ pH, s. u. Weekly /n-situ TDS, mg/P Quanerly Grab • Ste Wimcr Mowonne Elemption discussion fhat faUows. •• W£r monitoring is wowed Jas the first Calendar quarters and may b[ waived for The fourth quarters if inaccessibility v demonstra7cd. 7R means The rata/ reroverable frarnan, as defrnrd in the Basic Sfandardt and Me7hodoloeies Pot Surfac[ Waf[r (3.1.01. of If a viribtr shrm is no7ed, a grab sample shall br Collected and awtvud for oil and grease. the r[su(tr are !o be reported on the DMR under parameter 0358:. Winter Monitoring Exemption: The pennirtee asked for acarry-over of the monitoring exemption jot pH, oil and grease and Jlow jot outfalls 004 and 008. This exemption allows rnoinhly monitoring in lieu of x~teklp monitoring during [he period from November through February due to adverse weather conditions. The permittee also asked that this exemption be extended to ourjalls 005, 009 and 011 on the same basis. The exemption is grained, however more specific language has been included in the permit to rlanjy that this exemption is only available where access would be hazardous to personnel. This is consistent with monitoring exemptions granted to other permittees and is the only basis under which the Division believes we are justified in granting such an exemption. C. Reporting 1. Discharge Monitoring Report: Seneca Coal Company must submit a Discharge Monitoring Report (DMR) on a • quarterly basis to the Division. This report should contain the required summarization of the test results for parameters shown in Tables VI-9 through VI-11 and Pan I. B.1 of the permit. See the permit, Part /. E. 1. for details on such submission. 2. Special Reports: Special reports are required in the event oja spill, bypass, or other noncompliance. Please refer to Pan I. E. of the permit jot reporting requirements and Pan II.A. for notification requiremeins.