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<br /> <br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 6. Permit No. CO-0036684. <br />VI. TERMS AND CONDITIONS OF PERMIT <br />Table VI-2 -- Federal Standards <br />Parameter <br />Total Suspended Solids, mg/1 <br />Total Iron, mg/1 <br />35 <br />3.5 <br />Daily Maximum <br />70 <br />7.0 <br />The above federal limits are from Subpart D of 40 CFR 434, Alkaline <br />Mine Drainage. Although the effluent at this facility is not <br />actually mine drainage, spoil springs water is present, which can <br />be very simi]ar to mine drainage. Therefore, the limitations for <br />mine drainage are applied. This means that the allowance for <br />different limitations in the case of precipitation-induced <br />discharge are not applicable to the facility. (This is a change <br />from the previous permit, which did allow such exceptions.) <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 for 011 and Grease is based on this <br />regulation. <br />4. Discussion of Limitations: <br />a) Salinity (Total Dissolved Solids): The Regulation for <br />Implementation of the Colorado Salinity Standards Through the <br />Colorado Discharge Permit Program (3.10.0), addresses the <br />discharge of total dissolved solids (TDS) to the Colorado River <br />Basin. It is a requirement of this regulation that all <br />discharges into the Colorado River basin be monitored for TDS on <br />a continual basis. Therefore, in compliance with this <br />regulation the permittee must monitor for salinity on a <br />quarterly basis. <br />As noted in a permit amendment dated August 24, 1990, the <br />permittee established a correlation between Total Dissolved <br />Solids (TDS) and electrical conductivity. (For this facility, a <br />TDS value of 3000 mg/1 correlates to 2577 micromhos/cm for <br />electrical conductivity.) Therefore, salinity will be monitored <br />in this permit by using electrical conductivity. <br />5. Whole Effluent Toxicity (WET) Testing: For this facility, acute <br />and chronic WET testing are required. (See Parts I.A and I.B of <br />the permit.) Monitoring shall be performed commencing with the <br />first full calendar quarter following the permit effective date. <br />Avg. of Daily Values <br />for 30 Consecutive Days <br />