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~~ PARTI ' Permit No. CO-0032638 Page No. 15 E. GENERAL MONITORING, SAMPLING AND REPORTING REQUIItEMENTS 1. Routine Renortinp of Data (continued) The DMR forms consist of four pages -the top "original" copy, and three attached no-cazbon-required copies. After the DMR form has been filled out and signed, the four copies must be sepazated and distributed as follows: The first anginal signed copy of each dischazge monitoring report (DMR) shall be submitted to the Division at the following address: Colorado Department of Public Health and Environment Water Quality Control Division WQCD-P-B2 ' 4300 Cherry Creek Drive South Denver, Colorado 80246-1530 Additional copies aze for the pemattee records. The Discharge Monitoring Report forms shall be filled out accurately and completely in accordance with requirements of this pemtit and the instructions on the fomts. An authorized person as identified in Part I.E.6 shall sign them. Calculations for all limitations, which require the averaging of measurements, shall utilize an azithmetic mean unless otherwise specified by the Division in the permit. 2. Representative Samnline Samples and measurements taken as required herein shall be representative of the volume and nature of the monitored discharge. All samples shall 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 and approval by the Division. If the permitiee monitors at the point of dischazge any pollutant limited by the pemtit more frequently than required by the pemvt, using approved test procedures or as specified in the pemvt, the result of this monitoring shall be included in the calculation and reporting of data to the Division. 3. Analytical and Samoline Methods for Monitoring The pemtittee shall install, calibrate, use and maintain monitoring methods and equipment, including biological and indicated pollutant monitoring methods. All sampling shall be performed by the permittee according to specified methods in 40 C.F.R. Part 136; methods approved by EPA pursuant to 40 C.F.R Part 136; or methods approved by the Division, in the absence of a method specified in or approved pursuant to 40 C.F.R Part 136. The analytical method selected for a parameter shall be the one that can measure the lowest detected limit for that parameter unless the pernrit limitation or stream standazd for those pazameters not limited, is within the testing range of another approved method. When requested in writing, the Division may approve an alternative analytical procedure or any significant modification to an approved procedure.. When the most sensitive analytical method which complies with this part, has a detection limit greater than or equal to the pemvt limit, the permittee shall report "less than (the detectable limit)," as appropriate. Such reports shall not be considered as violations of the permit limit. The present lowest method detection limits for specific pazameters (which have limitations that aze, in some cases, less than or equal to the detection limit) aze as follows: e -~ 'acne ~ e . Total Mercury. 0.00025 These limits apply to the total recoverable or the potentially dissolved fraction of metals. The procedure for determining settleable solids is contained in 40 CFR 434.64. The method detection limit for measuring settleable solids under this part shall be 0.4 mUl.