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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale -Page 23, Permit No. CO-0043648 9. Economic Reasonableness Evaluation: Section 25-8-503(81 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 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 25-8-104. " The Regulations for the State Discharge Permit System, 6.1.0, funkier deftne 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 c[assiftcarions and standards seeing process, pernuu written to meet the standards may be presumed to have taken into consideration economic factors unless: aJ Anew permit is issued where the discharge was not in existence at the trine of the classification and standards rulemaldng, or 6J In the case of a continuing discharge, additional information or factors have emerged that were not anticipated or considered at the time of the classification and standards rulemaldng. " The evaluation for this permit shows that this is a new facility not in existence at the time of water quality standards rulemaking. However, based on available data, the resulting water quality standard-based e,~7uenr limitations are determined to be reasonably related to the economic, environmental, public health, and energy impacts to the public and affected persons. if the permiuee disagrees with this ftnding, pursuant to 6.12.0(2)(6) the permrnee should submit all pertinent information to the Division during the public notice period. B. Monitoring 1. Monitorine -Monitoring will be required as shown in the following tables. Refer to the permit for locations of monitoring points. Table V/-6 Monitoring jot: ' Points OOIA (na s[ormwmer) and 0018 (including stormwmer) - Areqrta Grtlch m Station AG-I.S; Poim 004A - Springs forming Aregtra Gulch within Aregrta Gulch Rock Storage Area; Point OOSA - Non-Spring Seepage from Arequa Gulch Roek Storage Area (does not include stormwmer), At Discharge /mo Diversion Ditch Surrounding the Valley Leach Facility; Poim 006A - Non-Spring Seepage from Aregrta Gulch Rock Storage Area, Mixed With Stormwmer, At Disclwrge From Diversion Ditch to Arequa Gulch Below the Valley Leach Facility Point 007A - Discharges From the Valley Leach Facility T/un Qrralijy for Annrtal Precipitation ar Storm EjJ(ttent Parameter Measuremem Frequency Sample Type Flaw, MGD Exemption Discharges - 007A Daily (Or Continuous) Instantaneous (Or Recorder) Points OOIA, OOIB, 004A, Continuous Recorder OOSA, 006A pH, su (minimum-maximum) 2 Tunes/Week In-Situ TSS, mg/! Weekly Composite Tornl Hardness, rrtg/1 Weekly Composite Amrnonin, Total, mg/[ (Ibs/day) Not Required Until Cbanide Removal Process Is Beeun Cynnuh•, WAD, mq/! (llac/day) 2 Times/Week Grn6 conr'd