_GENERAL DOCUMENTS - C1981017 (302)

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PART I Page 6 Permit NO.: COG-070000 ' B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Continued) e/ - Definitions of Sample Type 1. A "composite" sample, for monitoring requirementk, is a minimum of four(4) grab samples collected at equally spaced two (2) hour intervals and proportioned according to flow. 2. A "grab" sample, for monitoring requirements, is a single "dip and take" sample. 3. An "instantaneous" measurement, for monitoring requirements, is a single reading, observation, or measurement performed on site. 4. A "continuous" measurement, for flow monitoring requirements, is a measurement obtained from an automatic recording device which continually measures flow. S. An "in-situ" measurement, for monitoring requirements, is defined as a single reading, observation or measurement taken in the field at the point of discharge. 6. A "visual" observation, for oil and grease monitoring requirements, is observing the discharge to check for the presence of a visible sheen or floating oil. V - In the event an oil sheen or floating oil is observed, a grab sample shall be collected, analyzed, and reported. In addition, corrective action shall be taken immediately to mitigate the discharge of oil and 8rease. g/ - Where based on a minimum of 5 samples, the permittee demonstrates,.to the satisfaction of the Water Quality Control Division, that the level of Total Dissolved Solids (IDS) in the effluent can be calculated based upon the level of electrical conductivity, the permittee may measure and report TDS in terms of electrical conductivity. h/ - Total Dissolved Solids monitoring is required only for discharges to the Colorado River Basin. See specific facility certification rationale to determine whether TDS monitoring is required. C. REPORTING REQUIREMENTS 1. Revresentative Sampling Samples and measurements taken as required herein shall be representative of the volume and nature of the monitored discharge.