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PART I Page No. 13 Permit No. COG-850000 D. GENERAL MONITORING, SAMPLING AND REPORTING REQUIItEMENTS 2. Reoortine - Stormwater Anneal Retrort (continued) Colorado Department of Public Health and Environment WQCD-PE-B2 4300 Cherry Creek Drive South Denver, CO 80222-1530 3. Reresentative Samaline Samples and measurements taken as required herein shall be representative of the volume and nature of the monitored dischazge. All samples shall be taken at the monitoring points specified in this permit and, unless otherwise specified, before the effluent joins or is diluted by any other wastestream, body of water, or substance. Monitoring points shall no[ be changed without notification to and approval by the Division. [f the permittce monitors at the point of discharge any pollutant limited by the permit more frequently than required by the permit, using approved test procedures or as specified in the permit, the result of this monitoring shall be included in the calculation and reporting of data to the Division. 4. Analvtical and Semolina Methods for Monitorine The permittee shall install, calibrate, use and maintain monitoring methods and equipment, including biological and indicated pollutant monitoring methods. All sampling shall be performed by the permittce according to specified methods in 40 CFR Part 136; methods approved by EPA pursuant to 40 CFR Part 136; or methods approved by the Division, in the absence of a method specified in or approved pursuant to 40 CFR Part 136. The analytical method selected for a parameter shall be the one that can measure the lowest detected limit for that parameter unless the: permit limitation or stream standard for those patamctets 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 limit greater [hen or equal to the permit limit, the permittce shall report "less than (the detectable limit)," as appropriate. Such reports shall not be considered as violations of the permit limit. The method detection limit for measuring settleable solids tinder this part shall be 0.4 mP/P. 5. Records The permittce shall establish and maintain rewrds. Those records shall include the following: a. The date, type, exec[ 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 of the dischazge as indicated in 40 CFR 122.44 (I)(I)(iii). The permittce shall retain for a minimum of three (3) years records of all monitoring information, including all original strip chart recordings for continuous monitoring instmmentation, all calibration and maintenance records, espies 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 discharge of poilu[ants by the permittce or when requested by the Division or EPA.