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PARTI <br />Page 12 <br />Permit No. COG-500000 <br />E. DEFINITIONS (continued) <br />5. When the measurement frequency indicated is quarterly, the samples shall be collected during March, June, September, and <br />December, if a continual discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that <br />discharge occurs. <br />Salinity is measured as Total Dissolved Solids (TDS). <br />7. The seven (7) day average shall be determined by the arithmetic mean of all samples taken in a seven (7) day period. Samples <br />may not be used for more than one (1) reporting period. <br />8. The thirty (30) day average shall be determined by the arithmetic mean of all samples collected during a thirty (30)-consecutive-day <br />period. Samples shall not be used for more than one (1) reporting period. <br />9. A "visual" observation, for oil and grease monitoring requirements, is observing the discharge to check for the presence of a visible <br />sheen or floating oil. In the event an oil sheen or floating oil is observed, a grab sample shall be collected, analyzed, and <br />reported on the appropriate DMR or annual report. In addition, corrective action shall be taken immediately to mitigate the <br />discharge of oil and grease. A description of the corrective action taken should be included with the DMR or annual report. <br />10. "Water Quality Control Division" or "Division" means the State Water Quality Control Division as established in 25-8-101 et al. <br />F. GENERAL REQUIREMENTS <br />Representative Sampling <br />Samples and measurements taken as required herein shall be representative of the volume and nature of the monitored discharge. All <br />samples shall be taken at the monitoring points specified in this permit and, unless otherwise specified, before the effluent joins or is <br />diluted by any other wastestream, body of water, or substance. Monitoring points shall not be changed without notification to and <br />approval by the Division. <br />2. Analytical and Sampling Methods for Monitoring <br />Analytical and sampling methods utilized by the discharger shall conform to Colorado Regulations for Effluent Limitations, Section <br />62.5, and to regulations published pursuant to Section 304(h) of the Clean Water Act. <br />The analytical method selected for a parameter shall be the one that can measure the lowest detected limit for that parameter unless <br />the permit limitation or stream standard for those parameters not limited, is within the testing range of another approved method. <br />3. Records <br />The permittee shall establish and maintain records. Those records shall include the following: <br />a. The date, type, exact location, and time of sampling or measurements; <br />b. The individual(s) who performed the sampling or measurements; <br />C. The date(s) the analyses were performed; <br />d. The individual(s) who performed the analyses; <br />e. The analytical techniques or methods used; <br />f. The results of such analyses; and <br />g, Any other observations, which may result in, an impact on the quality or quantity of the discharge as indicated in 40 CFR <br />122.44 (i)(1)(iii). <br />The permittee shall retain for a minimum of three (3) years records of all monitoring information, including all original strip chart <br />recordings for continuous monitoring instrumentation, all calibration and maintenance records, copies of all reports required by this <br />permit and records of all data used to complete the application for coverage under this permit. This period of retention shall be <br />extended during the course of any unresolved litigation regarding the discharge ofpollutants by the permittee or when requested by <br />the Division or Regional Administrator of EPA.