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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division Rationale -Page I2, Permit No. CO-0027146 TDS, mg/¢ Quarterly Grab Whole EJfluetu Toxicity, Quarterly Crab Acute* * In a continuation of a procedure established under the previous permit for outfa!!s 001 and 002, the permiaee shall collect a grab sample consisting of effluent from both outfalls and proportioned according to the flow rate at the time of sample collection. This combined sample sha/! be identified as outfall "RSM W'. Table V/-7 - Mnnitnrinn gwirementc fns Oa(falLs 005. OOh. OOZ OOR. 009_ 010. 011. 0I3. 074 .. .... Parameter Measurement Frequency Sample.Type :: : Flow, MGD Weekly Instantaneous or Continuous TSS, mg/¢ Momhly Crab Total Iron, mg/¢ Monthy Grab Settleable Solids, m¢/¢ Monthly Grab Oil and Grease, mg/¢ Weekly Visual g/ pH, s.u. Weekly In-situ Table VI-R - Mnnitnrinn Reouirementc fnr Ontfal[ 012 :. ... ..:...~. Parameter . ? Measurement Fre ei:c Sam le T e qu Y P YP :::. ; .:: . Flow, MGD Weekly Instamaneous or Continuous Settleable Solids, m¢/¢ Momhly Grab Oi! and Grease, mg/¢ Weekly Ytsual g/ pH, s.u. Weekly In-situ g/ If a visible sheen is noted, a grab sample shall be collected and analyzed for oil atd grease. The results are to be reported on the DMR under parameter 03581. C. Repotting I. Dischargg Monitotinn Reoort: Powderhorn Coal Company must submit a Discharge Monitoring Report (DMR) on a quarterly basis to the Division. This report should comain the required summarization of the test results jor parameters shown In Tables VI-6, V!-7 and VI-8 and Part /.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 evem of a spill, bypass, or other noncompliance. Please refer to Pan II.A. for notification requirements.