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Appendix 4.7-8 <br />PART III <br />Page 31 of 31 <br />Permit No.: C00048972 <br />40. "Toxicity Reduction Evaluation (TRE)" is a site-specific study conducted in a step -wise process to identify the <br />causative agents of effluent toxicity, isolate the source of toxicity, evaluate the effectiveness of toxicity control <br />options, and then confirm the reduction in effluent toxicity after the control measures are put in place. <br />41. 'Twenty four (24) hour composite" sample is a combination of at least eight (8) sample aliquots of at least 100 <br />milliliters, collected at equally spaced intervals during the operating hours of a facility over a twenty-four (24) <br />hour period. For volatile pollutants, aliquots must be combined in the laboratory immediately before analysis. <br />The composite must be flow proportional; either the time interval between each aliquot or the volume of each <br />aliquot must be proportional to either the wastewater or effluent flow at the time of sampling or the total <br />wastewater or effluent flow since the collection of the previous aliquot. Aliquots may be collected manually or <br />automatically. <br />42. 'Twice Monthly" monitoring frequency means that two samples shall be collected each calendar month on separate <br />weeks with at least one full week between the two sample dates. Also, there shall be at least one full week <br />between the second sample of a month and the first sample of the following month. <br />43. "Visual" observation is observing the discharge to check for the presence of a visible sheen or floating oil. <br />44. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in 25-8- <br />101 et at.) <br />45. "Water Quality Standards" - means a narrative and/or numeric restriction established by the Commission applied to <br />state surface waters to protect one or more beneficial uses of such waters. Whenever only numeric or only <br />narrative standards are intended, the wording shall specifically designate which is intended. See 5 CCR 1002- <br />31.5(37). <br />Additional relevant definitions are found in the Colorado Water Quality Control Act, CRS SS 25-8-101 et seq., the <br />Colorado Discharge Permit System Regulations, Regulation 61 (5 CCR 1002-61) and other applicable regulations. <br />