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PARTI <br />Page No. 13 <br />Permit No.: CO-0044776 <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 <br />permit limit, the permittee shall report "less than (the detectable limit)," as appropriate. Such reports shall not be considered <br />as violations of the pemtit limit. The present lowest method detecfion limits for specific parameters (which have limitations <br />that are, in some cases, less than or equal to the detection limit) aze as follows: <br />Effluent Characteristic <br />Arsenic <br />Total Residual Chlorine <br />Cadmium <br />Chromium <br />Copper <br />Lead <br />Total Mercury <br />Nickel <br />Selenium <br />Silver <br />Zinc <br />Method Detection Limits, me/I <br />0.01 <br />0.05 <br />0.0003 <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 [he potentially dissolved fraction of metals. <br />The procedtue 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 ml/i. <br />4. Records <br />The permittee shall establish and maintain records. Those records shalt include the following: <br />a. The date, type, exact location, and time of sampling or measurements; <br />b. The individual(s) who perforrrted the sampling or measurements; <br />c. The date(s) the analyses were performed; <br />d. The individual(s) who performed the analyses; <br />e. The analytical techniques or methods used; <br />f. The results of such analyses; and <br />g. Any other observations which may result in an impact on the quality or quantity of the discharge as indicated in 40 CFR <br />122.44 (i)(I)(iii). <br />The pemtittee shall retain for a minimum of three (3) years records of all monitoring information, including all original strip <br />chart recordings for continuous monitoring instrumentation, all calibration and maintenance records, copies of all reports <br />required by this permit and records of all data used to complete the application for this permit. This period of retention shall <br />be extended during the course of any tmresolved litigation regarding the discharge of pollutants by the permittee or when <br />requested by the Division or EPA. <br />5. Flow Measuring Device <br />If not already a part of the perttiltted facility, within ninety days after the effective date of the permit, a flow measuring device <br />shall be installed to give representative values of effluent quantities at the respective discharge points. Unless specifically <br />exempted, or modified in Part I.E.S of [his permit, a flow measuring device will be applicable at all designated discharge <br />points. <br />