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Yart I Page No. 18 Permit No.: CO-0043648 2. Analytical and Sampling Methods for Monitorint[ The petmittee shall install, calibrate, use and maintain monitoring methods and equipment, including biological and indicated pollutant monitoring methods. Analytical and samplmg methods utilized by the discharger shall be approved methods as defined by Colorado Regulations for E6luent Limitations (6 CCR 1002-3, 10. I.5), and federal regulations (40 CFR 136) and any other applicable Stale or Federal regulations. The analytical method selected for a parameter shall be the one that cap measure the lowest detected limit for that parameter unless the permit limitation or stream standard for those parameters is within the testing range o(another approved method. When requested in writing, the Water Quality Control Diviston 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 limit greater than or equal to the permit lunit, the permittee shall report "less than (the detectable limit)," as appropriate. Such reports shall not be considered as violations of the petmit 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) are as follows: Arsenic 0.01 mg/P Benzene 0.001 mg/P Total Residual Chlorine 0.05 mg/P Cadmium 0.0003 mg/P Chromium 0.01 mg/P Chromium, Hexavalenl 0.01 mg/P Copper 0.005 mg/P Cyanide, Weak Acid Dissociable 0.010 mg/P Lead 0.005 mg/P Total Mercury 0.00025 mg/P Nickel 0.05 mg/P Selenium 0.01 mg/P Silver 0.0002 mg/P Zinc 0.05 mg/P These limits apply to the total recoverable or the potentially dissolved fraction of metals. For hexavalent chromium, samples must be unacidified so that dissolved concentrations will be measured rather than potentially dissolved concentrations. Procedure for determining settleable solids is contained in 40 CFR 434.64. The method detection limit for measuring settleable solids under this pari shall be 0.4 ml/1. 3. Records The pertnit[ee 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; d) 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 o(the discharge as indicated in 40 CFR 122.44 (t)(I)(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 instnanentation, all calibration and maintenance records, copies of all reports required by this permit and records of all data used to complete the application for [his permit. This period of retention shall be extended during the course of an}' unresolved litigation regarding the discharge of pollutants by the permittee or when requested by the Division.