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PARTI <br />Page No. l3 <br />Permit No.: CO-0027146 <br />Calculations for all limitations which requue the averaging of measurements shall utilize an azithmetic mean unless otherwise <br />specified by the Division in the pemvt <br />2. Renresentative Samnlin¢ <br />Samples and measurements taken as required herein shall be representative of the volume and nature of the monitored <br />discharge. All samples shall be taken at the monitoring points specified in this permit and, unless otherwise specified, before <br />the effluent joins or is diluted by any other wastestream, body of water, or substance. Monitoring points shall not be changed <br />without notification to and approval by the Division. <br />If the permittee monitors at the point of discharge any pollutant limited by the pemut 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 Samnline Methods for MonitorinE! <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 pemrittee according to specified methods in 40 C.F.R. <br />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 <br />method specified in or approved pursuant to 40 C.F.R. part 136. The analytical method selected for a pazameter shall be the <br />one that can measure the lowest detected limit for that pazameter unless the permit limitation or stream standazd for those <br />pazameters not limited, is within the testing range of another approved method. When requested in writing, the Division may <br />approve an al[emative 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 <br />permit limit, the pemtittee shall report "less than (the detectable limit)," as appropriate. Such reports shall not be considered <br />as violations of the permit limit. The present lowest method detection limits for specific pazameters (which have limitations <br />that aze, 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 />Lead <br />Total Mercury <br />Nickel <br />Selenium <br />Silver <br />Zinc <br />Method Detection Limits, me/1 <br />0.01 <br />0.0003 <br />0.01 <br />0.01 <br />0.005 <br />0.005 <br />0.00025 <br />0.05 <br />0.01 <br />0.0002 <br />0.05 <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 wil! be measured rather than potentially <br />dissolved concentrations. <br />The procedure for determining settleable solids is contained in 40 CFR 434.64. The method detection limit for measuring <br />settleable solids under this part shall be 0.4 mlll. <br />4. Records <br />The permittee shall establish and maintain records. Those records shall include the following: <br />a. The date, type, exact location, and time 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 />INDperBP.dac <br />Revised 09/15/01 <br />