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PART 1 Page 10 of 26 Permit No.:CO0000003 17. "Practical Quantitation Limit(PQL)"means the minimum concentration of an analyte(substance)that can be measured with a high degree of confidence that the analyte is present at or above that concentration. The use of PQL in this document may refer to those PQLs shown in Part I.D of this permit or the PQLs of an individual laboratory. 18. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter if a continual discharge occurs. If the discharge is intermittent,then samples shall be collected during the period that discharge occurs. 19. "Recorder"requires the continuous operation of a chart and/or totalizer(or drinking water rotor meters or pump hour meters where previously approved.) "Seven(7)day average" means,with the exception of fecal coliform or E. coli bacteria(see geometric mean),the arithmetic mean of all samples collected in a seven(7)consecutive day period. Such seven(7)day averages shall be calculated for all calendar weeks,which are defined as beginning on Sunday and ending on Saturday. If the calendar week overlaps two months(i.e.the Sunday is in one month and the Saturday in the following month),the seven(7)day average calculated for that calendar week shall be associated with the month that contains the Saturday. Samples may not be used for more than one (1)reporting period. (See the"Analytical and Sampling Methods for Monitoring and Reporting Section in Part I.D.3 for guidance on calculating averages and reporting analytical results that are less than the PQL). 20. "Thirty(30)day average" means,except for fecal coliform or E. coli bacteria(see geometric mean),the arithmetic mean of all samples collected during a thirty(30)consecutive-day period. The permittee shall report the appropriate mean of all self- monitoring sample data collected during the calendar month on the Discharge Monitoring Reports. Samples shall not be used for more than one(1)reporting period.(See the"Analytical and Sampling Methods for Monitoring and Reporting Section in Part I.D.3 for guidance on calculating averages and reporting analytical results that are less than the PQL). 21. Toxicity Identification Evaluation(TIE)is a set of site-specific procedures used to identify the specific chemical(s)causing effluent toxicity. 22. "Total Metals" means the concentration of metals determined on an unfiltered sample following vigorous digestion(Section 4.1.3),or the sum of the concentrations of metals in both the dissolved and suspended fractions,as described in Manual of Methods for Chemical Analysis of Water and Wastes,U.S.Environmental Protection Agency,March 1979,or its equivalent. 23. "Total Recoverable Metals"means that portion of a water and suspended sediment sample measured by the total recoverable analytical procedure described in Methods for Chemical Analysis of Water and Wastes, U.S.Environmental Protection Agency,March 1979 or its equivalent. 24. Toxicity Reduction Evaluation(TRE)is a site-specific study conducted in a step-wise process to identify the causative agents of effluent toxicity, isolate the source of toxicity,evaluate the effectiveness of toxicity control options,and then confirm the reduction in effluent toxicity after the control measures are put in place. 25. "Twenty four(24)hour composite" sample is a combination of at least eight(8)sample aliquots of at least 100 milliliters, collected at equally spaced intervals during the operating hours of a facility over a twenty-four(24)hour period. For volatile pollutants,aliquots must be combined in the laboratory immediately before analysis. The composite must be flow proportional;either the time interval between each aliquot or the volume of each aliquot must be proportional to either the wastewater or effluent flow at the time of sampling or the total wastewater or effluent flow since the collection of the previous aliquot. Aliquots may be collected manually or automatically. 26. "Twice Monthly" monitoring frequency means that two samples shall be collected each calendar month on separate weeks with at least one full week between the two sample dates. Also,there shall be at least one full week between the second sample of a month and the first sample of the following month. 27. "Visual"observation is observing the discharge to check for the presence of a visible sheen or floating oil. 28. "Water Quality Control Division" or"Division"means the state Water Quality Control Division as established in 25-8-101 et al.) Additional relevant definitions are found in the Colorado Water Quality Control Act,CRS §§25-8-101 et sea.,the Colorado Discharge Permit System Regulations,Regulation 61 (5 CCR 1002-61)and other applicable regulations.