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PART I <br />Page xxi <br />Permit No. CO-0043648 <br />When the most sensitive analytical method which complies will[ this part, has a detection limit greater than or equal to <br />the permit limit, the permil[ee shall report 'less than (the detectable limit),' as appropriate. Such reports shall not be <br />considered as violations of [he permit limit. The present lowest method detection limits for specific parameters <br />(which have limitations which are, in some cases, less than or equal to the detection limit) are as follows: <br />Arsenic O.OI mg/P <br />Benzene O.OOI mg/P <br />Total Residual Chlorine 0.05 mg/P <br />Cadmium 0.0003 mg/P <br />Chromium 0.01 mg/P <br />Chromium, Hexavaleut 0.01 mg/P <br />Copper 0.005 mglP <br />Lead 0.005 mg1P <br />Total Mercury 0.00015 mg/P <br />Nickel 0.05 mg/P <br />Selenium 0.01 mg/P <br />Silver 0.0002 mg/P <br />Zinc 0.05 mg/P <br />3. <br />These limits apply to the total recoverable or the potentially dissolved fraction of metals. <br />For hexavalent chromium, samples must be unacidified so that dissolved concentrations will be measured rather than <br />potentially dissolved concentrations. <br />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 nil/I. <br />Records <br />The permtllee 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 />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 <br />40 CFR 122.44 (i)(I)(iii). <br />The permittee shall retain for a minimum of three (3) years records of all monitoring information, including all <br />original strip chart recordings for continuous monitoring instrumentation, all calibration and maintenance records, <br />copses of all reports required by this permit and records of all data used to complete the application for this permit. <br />This period of retention shall be extended during the course of any unresolved litigation regarding the discharge of <br />pollutants by the permittee or when requested by the Division. <br />INebl' ~~4/9l <br />