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PART I Page xvi Permit No. CO-0043567 F. GENERAL REQUII2Ei\fENTS Reoresenlative Samolin Samples and measurements taken as required herein shall be representative of the volume and nature of the monitored discharge. 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 not be changed without notification to and approval by the Division. 2. Analytical and Sam~linn Methods for Monitorine The perrruttee shall install, calibrate, use and maintain monitoring methods and equipment, including biological and indicated pollutant monitoring methods. Analytical and sampling methods utilized by the discharger shall be approved methods as defined by Colorado Regulations for Effluent Limitations (5 CCR 1002-3, 10.1.5), and federal regulations (40 CFR 136) and any other applicable State or Federal regulations. 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 parameters is within the testing range of another approved method. Wrtten requested in writing, the Water Quality Control 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 lirrut greater than or equal to the permit limit, the permittee shall report "less than (the detectable limit)," as appropriate. Such reports shall not he considered as violations of the permit limit. "Fhe procedure for determining settleable solids rs contained in 40 CFR 434.64. The method detection linut for measurine settleable solids under thrs pan shall be 0.4 ml/1. 3. Records The permntee shall estabiish 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; r) The analytical techniques or methods used; I) The results o(such analyses; and _~) An.• other observations which may result in an impact on the quality or quantity of the discharge as indicated m 40 CFR 122Ad (i)(1)(iii). The permntee shall retain for a minimum of three (3) years- records of all monitoring information, includine all original strip chart rccordines for continuous monitoring mstrumentahon, all calibration and maintenance rccerds, copies of all reports iryunrd be this pcrrrui and records of all data used to complete the application for this permit. This period.of retention ,hull be evrndcd durine the course of any unresolved litigation regardme the discharge of pollutants by the permiure or when rcyuracd by the Division. 4. Flow \leasurin ~ Der'ice II not already a part of the permitted facility, within ninety (90) days after the effective date of the permit, a flow meusunng Javier shall be installed to give representative values of effluent quantities at the respective discharee points. Unless speci hcally exempted, or modified in Part LB.2 of this permit, a flow measuring device will be applicable at all Jesi~~mued th ~rlt:{ree points. v the request of the \t afar Qualm Control Division, the permitter .hall shoss proof of the nxuracv of any Ilrn~-measu rin_ d~ ~ ire uti::d in ebtaimn~~ data suhmittrJ m the momtorim~ rtport. The tlosv-measurin_~ dr~~ic~ muss indic:ne s~alurs wuhin t:n i Ill) prr~ent of the actual flow bane Discharged from the facility.