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' ~ COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 7. Permit No. CO-0040827. <br />VI. TERMS AND CONDITIONS OF PERMIT <br />b) Post-Mining Areas - 001, 003, 004, 005, 007, 008: Commencing at <br />t e time active mining as cease an sur ace areas have been <br />returned to the required contour, all applicable discharges' <br />shall be subject to limitations other than those specified in <br />Part I.A.1. These post-mining limitations shall remain in <br />effect until bond release. The permittee shall notify the <br />Division upon cessation of active mining so that appropriate <br />permit modifications can be made. Limitations as noted in this <br />permit are in effect until such a modification is made. <br />3. Regulations for Effluent Limitations: The Regulations for Effluent <br />Limitations 10.1.0 apply to the conventional pollutants. For <br />this facility the limitation for 011 and Grease is based on this <br />regulation. <br />4. Discussion of Limitations: <br />a) Salinity (Total Dissolved Solids): The Regulation for <br />Implementation of the Colorado Salinity Standards Through the <br />Colorado Discharge Permit Program (3.10.0), addresses the <br />discharge of total dissolved solids (TDS) to the Colorado River <br />Basin. It is a requirement of this regulation [hat all <br />discharges into the Colorado River basin be monitored for TDS on <br />a continual basis. Therefore, in compliance with this <br />regulation the permittee must monltor for TDS on a quarterly <br />basis. <br />5. Whole Effluent Toxicity (WET) Testing: For this facility, acute <br />WET testing is required at 002. (See Parts I.A and I.6 of the <br />permit.) Mouitoring shall be performed commencing with the first <br />full calendar quarter following the permit effective date. <br />a) Purpose of WET Testing: Section 6.9.7 of the Regulations for <br />the State Discharge Permit System (6.1.0), passed by the Water <br />Quality Control Commission (WQCC), has established the use of <br />WET testing as a method for identifying and controlling toxic <br />discharges from wastewater treatment facilities. WET testing is <br />being utilized as a means to ensure that there are no discharges <br />"in amounts, concentrations or combinations which are harmful to <br />the beneficial uses or toxic to humans, animals, plants, or <br />aquatic life" as required by Section 3.1.11 (1)(d) of the Basic <br />Standards and Methodologies. <br />Chemical analysis of effluent has provided only a partial <br />evaluation of the potential impact a discharge could have on the <br />receiving stream. Also, chemical analysis cannot evaluate the <br />synergistic or antagonistic effect of compounds. There are also <br />compounds for which an accurate or reproducable method of <br />chemical analysis has not ye[ been developed, as well as <br />compounds which are just beginning to be evaluated for toxic <br />