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PART <br />Page 9 <br />Permit No. COG - 603000 <br />Water Quality Control Division <br />WQCD -P -B2 <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80246 -1530 <br />All additional copies are for the permittee records. The Discharge Monitoring Report forms shall be filled out accurately and <br />completely in accordance with requirements of this permit and the instructions on the forms. They shall be signed by an <br />authorized person as identified in Part I.E.6. <br />Calculations for all limitations which require the averaging of measurements shall utilize an arithmetic mean unless <br />otherwise specified in the permit <br />2. Representative Sampling <br />Samples and measurements taken as required herein shall be representative of the volume and nature of the monitored discharge. <br />All samples shall be taken at the monitoring points specified in this permit and, unless otherwise specified, before the effluent <br />joins or is diluted by any other wastestream, body of water, or substance. Monitoring points shall not be changed without <br />notification to and approval by the Division. <br />If the permittee monitors at the point of discharge any pollutant limited by the permit more frequently than required by the <br />permit, using approved test procedures or as specified in the permit, the result of this monitoring shall be included in the <br />calculation and reporting of data to the Division. <br />3. Analytical and Sampling Methods for Monitoring <br />The permittee shall install, calibrate, use and maintain monitoring methods and equipment, including biological and indicated <br />pollutant monitoring methods. All sampling shall be performed by the permittee according to specified methods in 40 CFR <br />Part 136; methods approved by EPA pursuant to 40 CFR Part 136; or methods approved by the Division, in the absence of a <br />method specified in or approved pursuant to 40 CFR Part 136. The analytical method selected for a parameter shall be <br />the one that can measure the lowest detected limit for that parameter unless the permit limitation or stream standard <br />for those parameters not limited, is within the testing range of another approved method. When requested in writing, <br />the Division may approve an alternative analytical procedure or any significant modification to an approved procedure. <br />When the most sensitive analytical method which complies with this part, has a detection limit greater than or equal to the permit <br />limit, the permittee shall report 'less than (the detectable limit)," as appropriate. Such reports shall not be considered as <br />violations of the permit limit. The present lowest method detection limits for specific parameters (which have limitations that <br />are, in some cases, less than or equal to the detection limit) are as follows: <br />Effluent Characteristic <br />Arsenic <br />Cadmium <br />Chromium <br />Chromium, Hexavalent <br />Copper <br />Iron <br />Lead <br />Manganese <br />Mercury <br />Nickel <br />Phenols <br />Selenium <br />Silver <br />Zinc <br />Method Detection Limits, me/1 <br />0.010 <br />0.005 <br />0.010 <br />0.010 <br />0.005 <br />0.1 <br />0.005 <br />0.6 <br />0.000003 <br />0.020 <br />0.050 <br />0.010 <br />0.0002 <br />0.010 <br />These limits apply to the total recoverable or the potentially dissolved fraction of metals. <br />For hexavalent chromium, samples must be unacidified so dissolved concentrations will be measured rather than potentially <br />dissolved concentrations. <br />Monitoring is required only when chlorine is present in any concentration in the source water or is added. For purposes of <br />this permit the method detection limits of the DPD colorimetric and the amperometric titration methods of analysis for total <br />residual chlorine are as follows: <br />