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' Table 1 <br />Discharge Limitation <br />Discharge Limitation Measurement <br />Effluent Parameter (Daily Maximum Concentration) Frequenry Sample Typet't <br />' Flow, MGD Reportt'-t Monthly Instantaneous <br /> or Continuous <br />pH, standard units 6.5-9.0 Monthly Grab <br />' <br />(minimum-maximum) <br />Oil and Grease (mg/I) lOt~~ Monthly Visualt't <br />' (no visible sheens) <br />Settleable Solids (mg/I)ti~ 0.5 Monthly Grab <br />' Total Dissolved Solids (mgll) Report Quarterly Grab <br />' t" Definitions of Sample Type <br />A "grab" sample, for monitoring requirements, is a single "dip and [ake" sample. <br />An "instantaneous" measurement, For monitoring requirements, is a single reading, <br />observation, or measurement performed on site. <br />A "continuous" measurement, for flow monitoring requirements, is a measurement obtained <br />from an automatic recording device which continually measures flow. <br />' A "visual" observation, for oil and grease monitoring requirements, is observing the discharge <br />to check for the presence o[ a visible sheen or floating oil. <br />trt This limitation is determined by a single sample or set or of samples as required by Part I B.3, Sample <br />1 ~. <br />t't In the event an oil sheen or floating oil is observed, a grab sample will be collected, analyzed, and <br />reported. In addition, corrective action will be taken immediately to mitigate the discharge of oil and <br />grease. <br />' tot Procedure for determining settleable solids is contained in 40 CFR 434.64. The method detection <br />limit for measuring settleable solids under this part will be 0.4 mIA. <br />Sources: Colorado Department of Health, (Coal Mining General Permit) and 40 CFR Part 434.64. <br />1 <br /> <br /> <br />1 <br />