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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 ReporttZ~ Monthly Instantaneous <br />or Continuous <br />pH, standard units 6.5-9.0 Monthly Grab <br />(minimum-maximum) <br />Oil and Grease (mg/I) lOt" Monthly Visuals" <br />(no visible sheen) <br />Settleable Solids (mg/I)' 0.5 Monthly Grab <br />t't Definitions of Sample Type <br />A "grab" sample, for monitoring requirements, is a single "dip and take" sample. <br />An "ins[antaneous" measurement, far monitoring requirements, is a single reading, <br />observation, or measurement performed on site. <br />• A "continuous" measurement, for (low monitoring requirements, is a measurement obtained <br />from an automatic recording device which continually measures Oow. <br />A'wisual" observation, for oil and grease monitoring requirements, is observing the discharge <br />to check for the presence of a visible sheen or floating oil. <br />m This limitation is determined by a single sample or set or of samples as required by Part I B.3, Sample <br />Type. <br />r'I In the event an oil sheen or floating oil is observed, a grab sample will be collec[ed, analyzed, and <br />reported. In addition, corrective action will be taken immediately to mitigate the discharge of oil and <br />grease. <br />~'~ 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 ml/I. <br />Sources: Colorado Department of Health, Permit No.: COG-850010 and 40 CFR Pan 434.64. <br />u <br />