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COLORADO DEPAR?MENT OF HEALTH <br />Water Quality Control Division <br />Summary of Rationale Paqe 5 <br />Permit Number: CO-00001244 <br />II. EFFLOENT LIMITATIONS AND RATIONALE: (continued) <br />Limitations for most parameters in the permit are based on the South Platte Stream <br />Standards as adopted by the Water Quality Control Commission. Radium and barium <br />limitations are present in order to protect downstream water supplies. TSS and COD <br />limitations are based on federal BPT limitations for uranium mines. <br />Ambient levels for uranium to be used during the temporary modification will be <br />based on Federal BPT limitations, 2 coq/1-4 mgjl. <br />Monitoring for selenium, nickel, silver, boron, mercury and sulfate are deemd <br />necessary due to the elevated levels shown on the consolidated permit application <br />that may cause exceedance of water quality standards. If the data over a one year <br />period indicate that effluent limits to insure compliance with water quality standards <br />cannot be me[ by certain parameters, then the permit will be re-opened and effluent <br />limitations will 6e set for those parameters and a compliance schedule will be <br />included that will establish when stream standards will be me[. <br />Sulfate concentrations will be monitored in Ralston Reservoir at monitoring point <br />002 as shown in Figure 1, page 17. The monitoring point shall be in [hie reservoir <br />and shculd allow for complete mixing. <br />This permit dill be reopened and modified as explained on pages 13 an~i 14, if a <br />significant chance in operations occurs, if changes occur in the slate or federal <br />water quality standards or if the Water Quality Control Commission changes the <br />time frame on the temporary modification. <br />At [his time the final treatment plant design for both [he uranium treatment and <br />metal treatment facilities are unkno~,~n. Because of the unknown charac::eristics of <br />wastes from the treatment processes plus concern of indirect impact of seepage on <br />surface waters, the ^ermit will require retention facilities for the ne:w treatment <br />systems to be lined structures and non-discharging if they are used. .See page ,). <br />The Submittal of a plan will be required and subject to Division approval, prior <br />to construction. In addition, it is recommended that the retention facilities be <br />located outside of the 100 year floodolain of Ralston Creek. <br />Donald H. Simpson <br />Octo'oer 5, 193t <br />S <br />