Laserfiche WebLink
COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br /> Amendment No. 2 Rationale - Page 6. Permit Number CO-0000396 <br /> V. DISCUSSION OF AMENDMENT: (Continued) <br /> Alternatives: (Continued) <br /> 6) Mine flows will be routed to the WWTP. Overflow from the <br /> hydroclone/recycle sump will go to the 020 pond for "finishing" and <br /> then will discharge to Coal Creek. Underflow will go to the plant <br /> refuse filter. <br /> 7) Mine flows will be routed to the WWTP. Overflow from the <br /> hydroclone/recycle sump will go to the 020 pond for "finishing" and <br /> then will discharge to Coal Creek. Underflow will go to the raw <br /> coal sump, thickener, and plant refuse filter. <br /> Attachments 4 through 11 to the October 19, 1990 submittal letter from <br /> Mid-Continent show schematic diagrams of the above seven options. <br /> Revised Diagram of the New Water Treatment Plant System: Refer to the <br /> amended figure 4 of the permit for the diagram of the new WWTP and the <br /> other ponds which will be utilized for treatment. <br /> Discharge Points 020 and 028 - The revised present (surface water runoff <br /> only) and later (WWTP discharge/surface water runoff) limitations and <br /> monitoring requirements for discharge point 020 are listed in the <br /> following Tables Al through B3. The WWTP discharge limitations and <br /> monitoring for 020 will become effective at a later time when the <br /> wastewater treatment plant is in operation. The discharge requirements <br /> from the WWTP for outfall 028 are indicated in Table Bl. <br /> Limitations for Discharge Points 020 and 028: <br /> Table Al - Present Effluent Limits for Discharge Point 020 (Surface Water Only) <br /> Parameter Limit Rationale <br /> Flow, MGD Report d/ Flow Assessment <br /> Oil and Grease, mg/1 10.0 b/ State Effluent Regulations <br /> pH, s.u. 6.5 - 9.0 c/ Water Quality Standards <br /> Total Suspended Solids, mg/l 35/70 d/e/ Best Pract. Control Technology <br /> Total Recoverable Iron, mg/1 3.5/7.0 d/e/ Water Quality Standards <br /> Total Dissolved Solids, mg/1 Report b/ Salinity Regulations <br /> a/ - 30-day average b/ - Daily Maximum <br /> c/ - Minimum-Maximum d/ - 30-Day Average/Daily Maximum <br /> e/ - For storm event related discharges, see Tables A2 and A3 on the next page. <br />