2003-09-29_REVISION - M1977378 - Laserfiche WebLink

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COLORADO DEPARTMENT OFPU&~[CHEALTHAND ENVIRONMENT, Water ~iualiry Control Division Rationale -Page 6, CO-0027529 6. Economic Reasonableness Evaluation Section 25-8-503(8) of the revised (June 1985) Colorado Water Quality Control Act required the Division to "determine whether or not any or all of the water quality standard based effluen[ limitations are reasonably related to the economic, enviromnenta[, 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 Colorado Discharge Permit System Regulations, Regulation No. 62 (5 CCR ]002-62), further define this requirement 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 b) In the case of a continuing discharge, additional information or factors have emerged that were noe anticipated or considered at the time of the classification and standards rulemaldng. " The evaluation for this permit shows chat the Water Quality Control Commission, during their proceedings to adopt the Classification and Numeric Standards for the Snn Juan River and Dolores River Basins, considered economic reasonableness. Furthermore, this is not a new discharger and no new information has been presented regarding the classifications and standards. Therefore, the water gualiry standard-based effluent 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 of the policies set forth in Sections 15-8-102 and 104. B. Monitoring 1. Effluent Monitoring: Effluent monitoring will be required as shown in Table V/-2. Refer to the permit for locations of the monitoring point. Table V/-2 -Effluent Mnnitorin¢ Requirements for f?utfall 004 t'low, MGD Weekly Instantaneous pH, s. u. Weekly In-Situ Oil and Grease, mg/1 Weekly Visual Total Suspended Solids, mg/1 Weekly Grab Tonal Cadmium, mg/1 Weekly Grab Total Copper, mg/1 Weekly Grab Total Lead, mg/l Weekly Grab Total Zinc, mg/1 Weekly Grab Total Dissolved Solids, mg/l Quarterly Grab For every outfall with oil and grease monitoring, in the event an oil sheen or flaazing ail is observed, a grab sample shall be collected, analyzed, and reported on the appropriate DMR. In addition, corrective action shall be taken immediately to mitigate the discharge of oil and grease. A description of the corrective action taken should be included with the DMR.