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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division Rationale -Page 8, Permit No. CO-0036595 5. Economic Reasonableness Evaluation: Section 25-8-503(8) of the revised (June 1985) Colorado Water OualiN 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 afeected persons, and are in furtherance of the policies set forth in sections 25-8-/92 and 25-8-104. " The Regulations for the State Discharge Permit Syslem, 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 ojthe classification and standards rulemaking, or b) In the case oja continuing discharge, additional information or factors have emerged that were not anticipated or considered at the time of the classification and standards rulemaking. " The evaluation for this permit shows that the Water Quality Comrol Commission, during their proceedings to adopt the Classification and Numeric Standards for the Arkansas River Basin, considered tconomic reasonableness. Furthermore, this is nor a new discharger and no new information has been presented regarding the classifications and standards. Therefore, the water quality standard-based tffluent limitations of this permit are determined to be reasonably related to the economic, environmental, public health and energy impacts to the public and affected persons and are in furtherance ojthe policies set forth in Sections 25-8-102 and 704. ljthe permitree disagrees with this finding, pursuant to 6.72.0(2)(6) tJte permittee should submit all pertinem information to the Division during the public notice period. B. Monitoring • 1. Ellluent Monitoring: Efl4uem monitoring will be required as shown in Tables VI-4 and VI-5. Refer to the permit for locations of monitoring poius. Table VI-4 -Monitoring Requirements for OutjaUs OOI, 002 and 005 Pamreter : :::. ':. :: ' :::. Measurement Freauencv:' ' . Samale Tvye . Flow, MGD Weekly Instantaneous or Continuous TSS, mg/P Monthly Grab Total Iron, mg/P Monthly Grab Settleable Solids, mP/P Monthly Crab Oi! and Grease, mg/P Weekly Visual pH, s. u. Weekly /n-situ Table VI-5 -Monitoring Rcquircmcnu for Ouljal! 004 ' Parameter . Measurement Freoucacv . '.Sample Tvne .:. Flow, MGD Weekly Instantaneous ~ or Continuous TSS, mg/P Monthly Crab Total Iron, mg/l Monthly Grab . Oil and Grease, mg/P Weekly Visual ~ pH, s.u. Weekly In-situ Whole Effluent ToziciN. Acute Semi-Annually Grab