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<br />E. DEFINftTONS (continued) <br />Pnxrt <br />Page 13 <br />Pmirit No. COG-500000 <br />5. When the measurement frequency indicated is quarterly, the samples shall be collected during Mazch, June, September, and <br />December, if a comimtal discharge occurs. ff the discharge is intermittent, then samples shall be collected during the period that <br />discharge occurs. <br />6. Salinity is measured as Total Dissolved Solids (7'DS). <br />7. The seven (~ day average ahafl be determined by the arithmetic mean of all samples taken in a seven (~ day period. Samples <br />may not be rued for more than one (I) reporting period. <br />8. The thirty (30) day average shall be determined by the arithmetic mean ofall samples collected during a thirty (30)-consecutive-day <br />period. Samples shall not be used far more than one (1) reporting period. <br />9. A "visual" observation, for oil and grease monitoring regturmunts, is observing the discharge to check for the presence ofa visible <br />ahem or floating or7. In the event an oil shoes or floating oil is observed, a grab sample shall be collected, analyzed, and <br />reported on the appropriate DMR or antral 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 />] 0. "Water Quality Control Division" or "Division" means the State Water Quality Control Division as established in 25-8-101 et aL <br />F. GENERAL REQUIREMEN75 <br />1. R~resortative Satrroline <br />Samples and measurements taken as zegttired herein shall be representative ofthevohmte andnattue ofthe monitored discharge. All <br />samples shall be taken at the monitoring points specified in this pemrit and, tutless otherwise specified; before the eflhiort joins or is <br />diluted by any other wastestream, body ofwater, or substance. Monitoring points shall not be changed without noti5catioa to and <br />approval by tite Division.. <br />2. Analvtcal and Samoline Methods for Monitorine <br />Analytical and sampling methods atiliud by the discharger shall conform to Colorado Regulations for Elfluem Limitations, Section <br />62.5, and to regulations published pursuant to Section 304(h) of the Clean Water Act. <br />The analytical method selected foz a parameter shall be the one that cau measure the lowest detected limit for that parameter unless <br />the permit limitation or stream standard for those para>tttets not limited, is within the testing range of another approved method. <br />3. Rec r <br />The permittee shall establish and maintain records. Those records shall inchtde the following: <br />a The date, type. exact location, and tithe 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 amlyses; and <br />g. Any other observations, which may result in, an impact on the quality or quantity of the discharge as indicated is 40 CFR <br />122.44 (i)(1)(iii). <br />The pemilttee shall retain for a mini~im of three (3) years records of all monitoring information, including all original strip chart <br />recordings for continuous monitoring;a~+*+~ntation, all cahbration and maintenance records, copies ofall reports required by this <br />permit and records of all data used to complete the application for coverage under this permit. This period of retortion shall be <br />extended during the course ofany unresolved litigation regarding the discharge ofpollutaau by the permittee or when requested by <br />the Division or Regional Administrator of EPA. <br />