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Appendix C <br /> Page 67 of 67 <br /> Permit No.:COG500000 <br /> 53. "Toxicity Reduction Evaluation (TRE)"is a site-specific study conducted in a step-wise process to identify the causative agents of <br /> effluent toxicity,isolate the source of toxicity,evaluate the effectiveness of toxicity control options,and then confirm the <br /> reduction in effluent toxicity after the control measures are put in place. <br /> 54. "Twenty four(24)hour composite"sample is a combination of at least eight(8)sample aliquots of at least 100 milliliters, <br /> collected at equally spaced intervals during the operating hours of a facility over a twenty-four(24)hour period. For volatile <br /> pollutants,aliquots must be combined in the laboratory immediately before analysis. The composite must be flow proportional; <br /> either the time interval between each aliquot or the volume of each aliquot must be proportional to either the wastewater or <br /> effluent flow at the time of sampling or the total wastewater or effluent flow since the collection of the previous aliquot. <br /> Aliquots may be collected manually or automatically. <br /> 55. "Twice Monthly"monitoring frequency means that two samples shall be collected each calendar month on separate weeks with <br /> at least one full week between the two sample dates. Also,there shall be at least one full week between the second sample of <br /> a month and the first sample of the following month. <br /> 56. "Visual"observation is observing the discharge to check for the presence of a visible sheen or floating oil. <br /> 57. "Water Quality Control Division"or"Division" means the state Water Quality Control Division as established in 25-8-101 et al.) <br /> 58. "Water Quality Standards" -means a narrative and/or numeric restriction established by the Commission applied to state <br /> surface waters to protect one or more beneficial uses of such waters.Whenever only numeric or only narrative standards are <br /> intended,the wording shall specifically designate which is intended.See 5 CCR 1002-31.5(37). <br /> 59. "Wet pit"—generally,a non-navigable waters(frequently a flooded dry pit),from which raw material is extracted using dragline <br /> or barge-mounted dredging equipment(hydraulic dredge), both above and below the water table. (40 CFR 436). <br /> Additional relevant definitions are found in the Colorado Water Quality Control Act,CRS§§25-8-101 et sea.,the Colorado Discharge <br /> Permit System Regulations, Regulation 61(5 CCR 1002-61)and other applicable regulations. <br />