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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale - Page 12. Permit No. CO-0000221. VI. TERMS AND CONDITIONS OF PERMIT regardless of the dilution ratio. If the receiving water is classified. aquatic life class 2 with all appropriate aquatic life-based numeric standards and if the chronic stream flow-to-design flow ratio is less than 19:1, chronic WET testing is required. If the receiving water has no aquatic life classification with numeric standards, chronic monitoring is not required. In this case, discharge points 002, 003, 005 and 006 discharge to a receiving water which is classified as aquatic life class 2 with no aquatic life-based numeric standards, and so chronic WET testing is not required. However, discharge points 004 and 008 discharge to a receiving water which is classified as aquatic life class 1, and so chronic wET testing is required. Such testing shall be semi-annually, with two species for the first year, and with only the moat sensitive species during years two and three. A written request from the permittee, however, will be required before relief from two species testing will be allowed. After the third year of monitoring, the chronic testing requirement ends unless applicable regulations are adopted and the permit is modified for such new requirements. The permit has already been conditioned for termination of chronic monitoring after 3 years, beginning in July, 1992 and lasting through June, 1995. The permittee should read the WET testino sections of Part I.A. and I.B. of the permit carefully, and should note that the test methods for the toxici~ tests are described in detail in the Division guidance document, Guideline for Conductino Whole Effluent Toxicity Tests. This document should be read thoroughly prior to commencing the required WF.T testing, to ensure that the permittee is aware of the various test conditions that could affect the test results (e.g., sample holding time). 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. 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. B. Monitoring and Reporting 1. Monitoring: Monitoring requirements have not changed from the previous permit with the following exceptions: - WET testing has been added for discharge points 002, 003, 004, 005, 006 and 008