Laserfiche WebLink
COLORADO DEPARTMENT OF ffEALTH, Water Quality Control Division <br />Rationale - Page 8. Permit No. CO-0036595. <br />VI. TERMS AND CONDITIONS OF PERMIT <br />b} post-Mining Areas - 001 and 002: Commencing at the time active <br />mining has ceased and surface areas have been returned to the <br />required contour and the permit has been modified, all <br />applicable discharges shall be subject to limitations other than <br />those specified in Part I.A.1. These post-mining limitations <br />shall remain in effect until bond release. The permittee shall <br />notify the Division upon cessation of active mining so that <br />appropriate permit modifications can be 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 far Oil and Crease is based on this <br />regulation. <br />5. Whole Effluent Toxicity (WET) Testing: For this facility, acute <br />WET testing is required at discharge points 004 and 005. (See <br />Parts I.A and I.B of the permit.) Monitoring shall be performed <br />commencing with the first full calendar quarter following the <br />permit effective date. <br />a) Purpose of WET Testing: Section G.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. ITES 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 ~fetliodologies. <br />Chemical analysis of efFluent has provided only a partial <br />evaluation of Che 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 yet been developed, as well as <br />compounds which are just beginning to be evaluated for toxic <br />effects. WET testing will provide a more comprehensive means of <br />evaluating the toxicity of a discharge than could otherwise <br />currently be accomplished. <br />b) Instream Waste Concentration (IWC): As a condition of the <br />permit, the permittee will be required to conduct routine <br />monitoring for acute toxicity. Acute toxicity occurs when there <br />is a statistically significant difference in the mortality <br /> <br />