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• Termination requirements: The permittee may initiate termination of permit coverage by submitting a "CDPS Permits <br />and Authorization Termination Form." This form is available on the Division's web site (www.coloradowaterpermits.com.) <br />and must be signed by the legal contact. <br />• Analytical and sampling methods for monitoring: The permittee shall install, calibrate, use and maintain monitoring <br />methods and equipment, including biological and indicated pollutant monitoring methods. All sampling shall be <br />performed by the permittee according to specified methods in 40 C.F.R. Part 136; methods approved by EPA pursuant to <br />40 C.F.R. Part 136; or methods approved by the Division, in the absence of a method specified in or approved pursuant to <br />40 C.F.R. Part 136. <br />If the permit contains a numeric effluent limit for a parameter, the analytical method and PQL selected for all monitoring <br />conducted in accordance with this permit for that parameter shall be the one that can measure at or below the numeric <br />effluent limit. If all specified analytical methods and corresponding PQLs are greater than the numeric effluent limit, then <br />the analytical method with the lowest PQL shall be used. <br />If the permit contains a report only requirement for a parameter, the analytical method and PQL chosen shall be one that <br />can measure at or below the benchmark, or water quality standard, or other level approved by the Division. If all analytical <br />methods and corresponding PQLs are greater than the benchmark, or water quality standard, or other level, then the <br />analytical method with the lowest PQL shall be used. <br />If the permit contains an interim effluent limitation (a limit is report until such time as a numeric effluent limit becomes <br />effective) for a parameter, the analytical method and PQL chosen for all monitoring conducted in accordance with this <br />permit for the parameter shall be one that can measure to the final numeric effluent limit. If all analytical methods and <br />corresponding PQLs are greater than the final numeric effluent limit (s), then the analytical method with the lowest PQL <br />shall be used. <br />For parameters such as TIN, the analytical methods chosen shall be those that can measure to the potential or final <br />numeric effluent limit, based on the sum of the PQLs for nitrate, nitrite and ammonia. <br />When the analytical method which complies with the above requirements has a PQL greater than the permit limit, and the <br />permittee's analytical result is less than the PQL, the permittee shall report "BDL" on the DMR. Such reports will not be <br />considered as violations of the permit limit, as long as the lowest available PQL is used for the analysis. When the analytical <br />method which complies with the above requirements has a PQL that is equal to or less than the permit limitation, and the <br />permittee's analytical result is less than the PQL, "< X" (where X = the actual PQL achieved by the laboratory) shall be <br />reported on the DMR. For parameters that have a report only limitation, and the permittee's analytical result is less than <br />the PQL, "< X" (where X = the actual PQL achieved by the laboratory) shall be reported on the DMR. <br />In the calculation of average concentrations (i.e. 7- day average, 30 -day average, 2 -year rolling average), any individual <br />analytical result that is less than the PQL shall be considered to be zero for the calculation purposes. When reporting: <br />If all individual analytical results are less than the PQL, the permittee shall report either "BDL" or " <X" (where X = the <br />actual PQL achieved by the laboratory), following the guidance above. <br />If one or more individual results is greater than the PQL, an average shall be calculated and reported. Note that it does <br />not matter if the final calculated average is greater or less than the PQL, it must be reported as a value. <br />Note that when calculating T.I.N. for a single sampling event, any value less than the PQL (for total ammonia, total <br />nitrite, or total nitrate) shall be treated as zero. The T.I.N. concentration for a single sampling event shall then be <br />determined as the sum of the analytical results (zeros if applicable) of same day sampling for total ammonia and total <br />nitrite and total nitrate. From these calculated T.I.N. concentrations, the daily maximum and thirty day average <br />concentrations shall be calculated and must be reported as a value. <br />The present lowest PQLs for specific parameters, as determined by the State Laboratory (November 2008) are provided <br />below. If the analytical method cannot achieve a PQL that is less than or equal to the permit limit, then the method, or a <br />more precise method, must achieve a PQL that is less than or equal to the PQL in the Table H -1 below. A listing of the PQLs <br />for organic parameters that must meet the above requirement can be found in the Division's Practical Quantitation <br />Limitation Guidance Document, July 2008. <br />