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COLORADO DEPART<tifENI OF PUBLIC HEALTH AND EtWIRONMENI, Water Quc+liry Control Division Rationale -Page 16, Permit No. CO-0045161 VII. REFERENCES A. CO Dept. of Public Health and Environment, Water Quality Control Commissi,~n Regulation 31. Basic Standards ar:d Methodol~ies~r Surface Water (5 CCR 1002-31). Denver: CDPHE, .zr revised (/12/98 and effective 3/2/98. B. CD Dept. of Public Health and Environment, Water Quality Control Commissi.~n Regulation 37. Classifications and Nrtmeric Standards for the Lower Coforado River Basin f5 CCR 1002-37). Denver: CDPHE, as revised 7/14/97 and effective 8/30/97. C. CO Dept. of Public Health and Environment, Water Quafiry Control Commission Regulation 62. Regulations for fluent Limitations (S CCR 1002-62). Denver.• CDPHE, as revised 11/18/S'8 and effective 12/30/98. D. G~ Dept. of Public Health and Environment, Water Quality Control Commission Regulation 61. Colorado p,~crharge Permit System Regulations (5 CCR 1002-61). Denver: CDPHE, ,xs revised 3/10/98 and effective 4/30/98. E. CO Dept. of Public Health and Environment, Water Quality Control Division.. Coforado Total Maximum Daily Load and Wasreload Allocation Guidance. Denver: CDPHE, as revised 11/91. F. G~ Dept. of Public Health and Environment, Water Quality Control Division. Biomonitoring Guidance Document. Deenver.• CDPHE, July 1, 1993. G. U. S. Government, Office of the Federal Register, National Archives and Records Administration. Code of Federal Rtgulations (Part 434). Washington: 1997. VIII. PUBLIC NOTICE COMMENTS FIRST' PUBLIC NOTIC The Division received substantial comments from the permittee and from the Colorado Division of Minerals and Geology (CDMG). The Division prepared and mailed comment letters to the permittee and the CDMG responding in extensive detail. The permit and rationale have been modified in accordance with these comments. This section will more genercilly describe the concerns expressed and the changes the Division has deemed appropriate to make as a result. After comments were received, the permitree submitted to the CDMG a request far a technical revision (IR4I) to the mining permit to approve modification of all sedimentation ponds so that they operate in the "treatment" mode, i. e. the ponds will have automaric discharge structures. After moth, fication, tieere will be no rotuine need to open lower pond gates, this should only occur when the pond needs to be dewatered for maintenance purposes. The modifications should be in place around the time this permit is issued. Many of the permitree's and CDMG's comments referred to prior pond operations, thus they are no longer pertinent. Zhis section will describe changes to the permit and rationale that occur as a result of the pond reconfiguration and relatecf events. Please refer to section IV.B. for a description of the new pond configuration and the new internal outfalls. The perminee supplied volume and flow data for the new pond configurations. Ihese data have been included in Table !V-2. Tables 11-I and IV-2 have been modified to include information about five internal discharge points. Four of these internal points are points where pit water is pumped to the corresponding sedimentation ponds. Zhe fifth point serves as the discharge point from the Washbay Pond, which contains and treats wastewater from vehicle washing operations, to the Work Area/Warehouse Pond. which discharges to Taylor Creek. The permiaee has preliminarily agreed to meet limitations for, total suspended solids and total recoverable iron at these points (see section VI. for a complete listing of all limitations and monitoring requirements and the basis for their imposition). By demonstrating that these limitations are mat at these points, this will enable them to seek alternate limitations for discharges from the ponds when commingling of pit water or vehicle wash water and surface runo/j occurs. As a matter of practicality, the perminee would not be normally expected to be pumping pit water and/or vehicle wash water during significant storm event discharges from the sedimentation ponds, thus the pit water and/or vehicle wash water is not likely to appreciably reduce capacity in the ponds when it is needed for storm event water.