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PART I Page 15 Permit No. COG-Stb000 FOOTNOTES -APPLICABLE TO PRECEDING PAGES g! When the measurement frequency indicated is quarterly, the samples shall be collected during March, June, September and December, if a continua] discharge occurs. If the discharge is intermittent, then samples shall be collected during ' the period that discharge occurs. If the permittee, using the approved analytical methods, monitors any parameter more frequently rhea required by this permit, then the results of such monitoring shall be included in the calculation and reporting of the values required in the Discharge Monitoring Report Form or other forms as required by the Division. Such increased frequency shall also be indicated. h/ Definitions of Sample Type I. A 'composite' sample, for monitoring requirements, is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and proportioned according [o Flow. 2. A "grab" sample, for monitoring requirements, is a single "dip and lake" 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. 5. A 'visual' observation, for oil end grease monitoring requirements, is observing the discharge to check for the presence of a visible sheen or Floating oil. 6. An 'insi[u' measurement, for monitoring requirements, is defined as a single reading, observation or measurement taken in the field at Ute point of discharge. 7. A "24 hour composite" sample is a combination of at least eight (8) sample aliquots of at least Iq0 milliliters, collected at equally spaced intervals during the operating hours of a facility over atwenty-four (24) hour period. For volatile pollutants, aliquots must be combined in the laboratory immediately before analysis. The composite must be flow proportional; either the time interval between each aliquot or the volume of each aliquot must be proportional to either the wastewater or effluent flow at the time of sampling or the total wastewater or effluent flow since the collection of the previous aliquot. Aliquots may be collected manually or automatically. i/ In the event an oil sheen or Floating oil is observed, a grab sample shall be collected, analyzed, and reported on the appropriate DMR or annual report. In addition, corrective action steal! be taken immediately to mitigate the discharge of oil and grease. A description of the corrective action taken should be included with the DMR or annual report. j! 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 (TDS) 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. GENERAL REQUIREMENTS Representative Samplirtg Samples and measurements takes as required herein shall be representative of the volume and nature of the monitored discharge. All samples shag be taken at the monitoring points specified in this permit and, unless otherwise specified, before the effluent joins or is diluted by any other wastestream, body of water, or substance. Monitoring points shall not be changed without notification to end approval by the Division.