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Par[ 1 Page No. 11 Permit No.: CO-0046348 GENERAL MONITORING, SAMPLING, AND REPORTING REQUIREMENTS 3, Analytical and Cami ling Methndc fnr Mnnitnrinn The permittee shall install, calibrate, use and maintain monitoring methods and equipment and indicated pollutant-monitoring methods. All sampling shall be performed by the permittee 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 pazanreter shall be the one that can measure the lowest detection limit for that pazameter 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 1nnit greater than or equal to the permit litni[, 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 which are, in some cases, less than or equal to the detection limit) aze as follows: Arsenic 10 µg/1 Benzene 1µg/1 Total Residual Chlorine 50 µg/I Cadmium 1µg/1 Chromium ]0µg/1 Clu•onrium, Hexavalent 10 µg/I Copper 5µg/1 Cyanide, Free 20 µg/I Lead 5 µg/I Total Mercury 0.0025 µg/I Nickel 50 µg/1 Selenium 10 µg/I Silver 1 µgA Sulfide 2µg/1 Zinc 50 µg/1 These limits apply to the total recoverable, potentially dissolved, or dissolved fraction of metals. The detection limit specified for "free" cyanide is the lowest presently achievable and may be higher due to sample interferences or laboratory equipment limitations. For hexavalent clu'omium, samples must be unacidified so that dissolved concentrations will be measured rather than potentially dissolved concentrations. 4. Becords The pem>ittee shall establish and maintain records. Those records shall include the following: (a) The date, type, exact location, and time of sampling or measurements; (b) The individual(s) who performed the sampling or measurements; (c) The date(s) the analyses were performed; (a) The individual(s) who performed the analyses; (e) The analytical techniques or methods used; (f) The results of such analyses; and (g) Any other observations which may result in an impact on the quality or quantity of the discharge as indicated in 40 CFR 122.44 (i)(1)(iii). The permittee shall retain for a minimum of three (3) years records of all monitoring information, including all original strip chart recordings for continuous monitoring ntstmmentation, all calibration and maintenance records, copies of all reports required by this permit and records of all data used to complete the application for this permit. This period of retention shall be extended during the course of any unresolved litigation regarding the dischazge of pollutants by the permittee or when requested by the Division or EPA.