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• TABLE 1 <br />DISCHARGE LIMITATION <br />Dischazge Limitation <br />Effluent Parameter (Daily Maximum Concentration) Sample Type' <br />Flow, MGD Report' Instantaneous or Continuous <br />pH, standard units 6.5-9.0 Grab <br />(minimum-maximum) <br />Oil and Grease (mg/I) l0' Visual' <br />(no visible sheens) <br />Settleable Solids (mg/I)' 0.5 Grab <br />' Definitions of Sample Type <br />A 'grab" sample, for monitoring requirements, is a single "dip and take" sample. <br />An 'instantaneous" measurement, for monitoring requirements, is a single reading, observation, <br />or measurement performed on site. <br />• A 'continuous" measurement, for flow monitoring requirements, is a measurement obtained from <br />an automatic recording device which continually measures flow. <br />A "visual" observation, for oil and grease monitoring requirements, is observing the discharge to <br />check for the presence of a visible sheen or floating oil. <br />Monitoring only as required by Pan I.B.2.b. <br />' 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 [o mitigate the discharge of oil and <br />grease. <br />' Procedure for determining settleable solids is contained in 40 CFR 434.64. The method detection limit <br />for measuring settleable solids under this part will be 0.4 ml/I. <br />Sources: Colorado Department of Health, 7/8/92 and 40 CFR Pan 434.64. <br />• <br />