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COLORADO DEPARTMENT OF PUBLIC HEALTHAND ENVIRONMENT, Water Quality Control Division Rationale -Page 9, Permit No. CO-0032115 Srormwater permitting issues jot this facility will be handled separately by the Division's Stormwater Unit, although this permit maybe reopened at a later date to incorporate stormwater provisions, if deemed appropriate. 4. Economic Reasonableness Evaluation: Section 25-8-503(8) of [he 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 impacu to the public and affected persons, and are in furtherance of the policies set forth in sections 25-8-192 and 15-8-104." The Colorado Discharge Permit System Regulations, Regulation No. 61, further define this requirement under 61.II and state: "Where economic, environmental, public health and energy impacts to thepublic and affectedpersons have been considered in the classifications and standards setting process, permits wrinen 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 not anh'cipated or considered at the time of the classification and standards rulemala'ng." The evaluation for this permit shows that the Water Quality Control Commission, during their proceedings to adopt the Classifications and Numeric Standards for Lower Colorado River Basin, 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 quality 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 funherance'bfthe policies set forth in Sections 25-8-102 and ]04. Ijthe perminee disagrees with this fording, pursuant to 6/.II(b)(ii) of the Colorado Discharge Permit System Regulations, theperminee shou/d submit allpertinent information to the Divrsion during the public notice period. B. Monitoring 1. Effuent Monitoring: Effluent monitoring will be required as shown in Tables V7-S, VI-6, and VI-~. Refer to the permit for Locations of monitoring points. VI-S - Flow, MGD TSS, mg/l pH, s, u. Oil and Grease, mg/1 TDS, mg/! WET, Acute All outfalls except 002 Outfa11002 017. 079.020. 027. 023 once per weer[ instantaneous or ~ Once per month Grab Once per week In-Situ Once per week Visual Once per quarter Grab Once per quarter Grab Semi-Annually a Grab Last Revised: 4/14!2004