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~} ~ : ~~ <br />COLORADO DEPARTMENT OF H TH, Water Quality Control Divis• <br />Rationale - Page 16. Permit No. CO-0024562. <br />7. Antidegradation: An antidegredation review as required by section <br />3.1.8 of "Basic Standards and Methodologies for Surfact Water" <br />3.1.0 (5 CCR 1002-8) has been performed for this facility. The <br />passible change in loading to Fourmile Creek due to the change in <br />water quality standards is not considered to result in significant <br />degradation to Fourmile Creek. No limits have been changed as a <br />result of this review. <br />B. Monitoring and Reporting <br />1. Monitoring: Table VI-4 lists the monitoring requirements for this <br />facility, including sample type and frequency. <br />Table VI-4a -- Monitoring Requirements - no active mining or exploration <br />Measurement <br />Parameter Frequency Sample Type <br />Flow, MGD <br />Total Suspended Solids, mg/1 <br />Oil and Grease, iqg/1 <br />pH, s.u. <br />Potentially Dissolved Silver, mg/1 <br />Potentially Dissolved Zinc, ~/1 <br />Potentially Dissolved Lead, mg/1 <br />Potentially Dissolved Copper, m&/1 <br />Whole Effluent Toxicity, Acute <br />Whole Effluent Toxicity, Chronic <br />Through June 30, 1995 <br />Twice Monthly <br />Twice Monthly <br />Twice Monthly <br />Twice Monthly <br />Twice Monthly <br />Twice Monthly <br />Twice Monthly <br />Twice Monthly <br />Quarterly <br />Semiannually <br />Instantaneous <br />or Continuous <br />Grab <br />Visual or Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Table VI-4b -- Monitoring Requirements - active mining or exporation <br />Measurement <br />Parameter Frequency Sample Type <br />Flow, MGD <br />Total Suspended Solids, mg/1 <br />011 and Grease, mg/1 <br />pH, s.u. <br />Potentially Dissolved Silver, mg/1 <br />Potentially Dissolved Zinc, ~/1 <br />Potentially Dissolved Lead, mgll <br />Potentially Dissolved Copper, mg/1 <br />Potentially Dissolved Cadmium, mg/1 <br />Total Mercury, mg/1 <br />Whole Effluent Toxicity, Acute <br />Whole Effluent Toxicity, Chronic <br />Through June 30, 1995 <br />Weekly Instantaneous <br /> or Continuous <br />Weekly Grab <br />Weekly Visual or Grab <br />Weekly Crab <br />Weekly Grab <br />Weekly Grab <br />Weekly Grab <br />Weekly Grab <br />Weekly Grab <br />Weekly Grab <br />Quarterly Grab <br />Semiannually Grab <br />