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PARTI Page No. 14 Permit No.: CO-0036251 GENERAL MONITORING, SAMPLING AND REPORTING REQUIREMENTS 1. Routine Reporting of Data (Continued) Additional copies are for the pertnittee records. The Discharge Monitoring Report fortes shall be filled out accurately and completely in accordance with requirements of this pemtit and the instructions on the forms. They shall be signed by an authorized person as identified in Part LE.6. Calculations for all limitations which require the averaging of measurements shall utilize an arithmetic mean unless otherwise specified by the Division in the permit. 2. Representative Sampling 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 effluentjoins 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 permittee monitors at the point of discharge any pollutant limited by the permit more frequently than required by the pemtit, using approved test procedures or as specified in the permit, the result of this monitoring shall be included in the calculation and reporting of data to the Division. 3. Analvtical and Sampling Methods for Monitoring The permittee shall install, calibrate, use and maintain monitoring methods and equipment, including biological and indicated pollutant monitoring methods. All sampling shall be performed by the pettnittee 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 permit limitation or stream standard for those parameters 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 pemait 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 parameters (which have limitations that aze, in some cases, less than or equal to the detection limit) are as follows: Effluent Characteristic Method Detecfion Limits, mall Zinc 0.05 These limits apply to the total recoverable or the potentially dissolved fraction of metals. For hexavalent chromium, samples must be unacidified so dissolved concentrations will be measured rather than potentially dissolved concentrations. The procedure for detemunittg settleable solids is contained in 40 CFR 434.64. The method detection limit for measuring settleable solids under this part shall be 0.4 m]/1.