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COLORADO DEPARTMENT OF GIC HEALTH AND ENVIRONMENT, Wale ality Control Division <br />Rationale - Page 4, CO- 0027529 <br />VI. TERMS AND CONDITIONS OF PERMIT <br />A. Determination of Effluent Limitations <br />1. Effluent Limitations - The following limits will apply and are discussed in Sections VI A.2 and VI A.3. <br />Table VI-1 — Effluent Limits <br />Effluent Parameter <br />Whole Effluent Toxicity, Chronic <br />Discharge Limitations <br />Maximum Concentrations <br />30 -Day Avg. 7 -Day Avg. Daily Max Rationale <br />Limits for Point 004A <br />Flow, MGD (min -max) N/A N/A Report Discharge Assessment <br />pH, su (min -max) N/A N/A 7.0 - 10.0 Best Professional Judgment <br />Oil and Grease, mg /1 N/A N/A 10 State Effluent Regulations <br />TSS, mg /1 20 30 N/A Best Professional Judgment <br />Cadmium, Total, mg /I 0.05 N/A 0.10 Best Professional Judgment <br />Copper, Total, mg /I 0.15 N/A 0.30 Best Professional Judgment <br />Lead, Total, mg/1 0.30 N/A 0.60 Best Professional Judgment <br />Zinc, Total, mg /I 0.75 N/A 1.5 Best Professional Judgment <br />TDS, mg /1 N/A N/A Report Salinity Regulations <br />Limits for Point 004X - Only Applicable Until Treatment of Cement Creek Has Begun <br />3. Discussion of Effluent Limitations <br />N/A N/A No Significant <br />Difference <br />Discharge Permit <br />Regulations <br />a. Regulations for Effluent Limitations: The Regulations for Effluent Limitations (10.1.0), apply to the <br />conventional pollutants. For this facility the limitation for oil and grease is based on this regulation. <br />b. Applicable Federal Effluent Guidelines and Standards: Since no active mining is occurring, no federal <br />guidelines apply to this type of facility. <br />c. Flow Limitation: The permittee has entered into a consent agreement with the State, which specifies how the <br />combination ofAmerican Tunnel flow and the flows Cement Creek and its tributaries will be routed through <br />the treatment plant. The flow routing procedure may be relatively complicated and specification of a single <br />flow limit may not be possible. Therefore, only flow reporting, without a limit, will be required. <br />d. Limits Based Upon Best Professional Judgment: The previous permit contained effluent limits for TSS and <br />metals that were based upon the federal effluent regulations (BAT). And, the pH limit was based upon a BPJ <br />adjustment to the State Effluent Regulation limit, which resulted from the Division's consideration of impacts <br />to the receiving stream. <br />No active mining is currently occurring. Therefore federal BAT limitations are not directly applicable. <br />However, as a result of the consent agreement between the permittee and the state, the permittee will operate <br />the treatment plant in the same manner as that which was done during the term of the previous permit, and <br />effluent concentrations will likely be similar to those discharged in the past. Therefore, the same limits for <br />TSS, metals and pH contained in the previous permit will be implemented in this renewal permit. <br />