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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale - Page 17. Permit No. CO-0027146 VI. TERMS AND CONDITIONS OF PERMIT A. Effluent Limitations (continued) 6. Economic Reasonableness Evaluation: (continued) The Regulations for 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 co the public and affected persons have been considered in the classifications and standards setting process, permits written co meet the standards may be presumed co have taken into consideration economic factors unless: a) Anew permit is issued where the discharge was not in existence ac the time of the class ificacion and standards rulemaking, or b) In the case of a continuing discharge, additional information or factors have emerged chat were not anticipated or considered at the time of the classification and standards rulemaking." The evaluation for this permit shows that Che Water Quality Control Commission, during their proceedings co adopt the Classification and Numeric Standards for the Lower Colorado River Basin, considered economic reasonableness. Furthermore, this is not a uew discharger and no new informatior. has been presented regarding the classifications and standards. Therefore, the water quality standard-based effluent limitations of this permit are determined co be reasonably related Co the economic, environmental, public health and energy impacts co the public and affected persc-s and are in furtherance of the _policies set forth in Sections 15-8-102 and 104. If the ' permittee disagrees with ;,his finding, pursuant co 6.12.0(2)(b) j the permittee should submit all pertinent information co the ,Division during the public notice period. 7. Antidegradation: These are not reviewable waters pursuant co Section 3.1.8(3)(a) of the Basic Standards and Methodologies for Surface Water (SGCR 1002.2), based on a finding of no increased water quality impact. B. Monitoring and Reporting 1. Monitoring: Monitoring requirements have not changed from the previous permit with the exception of the addition of whole effluent toxicity (WET) testing chat is now required for outfalls 001, 002 and 004. The reason for the change is the addition of section 6.9.7 to the Regulations for the Scace Discharge Permit System. This section addresses WET casting requirements.