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' ~I.ORADO DEPARTMENT OF HEALTH, Water Quality Control Div isio• tionale - Page 11 Permit No. CO-0043168 ;; 5. Whole Effluent Toxicity (WETI Testing: (Continued} The permittee should read the WET testing sections of Part I.A and I.B of the permit carefully, and should note that the test methods for the toxicity tests are described in detail in the Division guidance document, Guidelines for Conducting_Whole Effluent Toxicity Tests. This document should be read thoroughly prior to commencing the required WET testing, to ensure that the permittee is aware of the various test conditions that could affect the test results (e.g., sample holding time). The permittee should be aware that some of the conditions outlined above may be subject to change if the facility experiences a change in discharge, as outlined in Part II.A.1 of the permit. Such changes shall be reported to the Division immediately. Part I.B. of the permit contains a very rigorous automatic compliance schedule which the permittee is required to follow, if an unacceptable level of toxicity is detected in the discharge. The permit is primarily conditioned so that Division notification provisions of the compliance schedule are triggered from the date of receipt, at the Division, of mailed documents. As every day beyond the allotted time may constitute a day of violation, it may be in the best interest of the permittee to mail documents certified-return receipt requested, so as to establish a record of the submittal. 6. Antideeradatf.on Review: An antidegradacion evaluation was 3one by the Division on April 3, 1992. Since the classifications for Gregory Gulch and North Clear Creek (segment 13) are use protected, an antidegradation review is not required pursuant to section 3.1.8(1)(b)(iii) of the Basic Standards and Methodologies for Surface Water (reference A). 7. Economic Reasonableness Evaluation: Section 25-8-503(8) of the Colorado Water Quality Control Act required the Division to "determine whether or not any or all of the water quality standard based effluent limitations are reasonably related to the economic, environmental, public health and energy impacts to the public and affected persons, and are in furtherance of the policies set forth in sections 25-8-192 and 25-8-104." The Regulations fot the State Discharge Permit System, 6.1.0, further define this requirement under 6.12.0 and state: "Where economic, environmental, public health and energy impacts to the public and affected persons have been considered in the classifications and standards setting process, permits written to meet the standards may be presumed to have taken into consideration economic factors unless: a) Anew permit is issued where the discharge was not in existence at the time of the classification and standards rulemaking, or