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<br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 6. Permit No. CO-0026981 <br />EFFLUENT LIMITATIONS, RATIONALE, AND MONITORING FREQUENCIES: <br />Table IV <br />Applicable Facility Permit Effluent Limitations for <br />January 1, 1989 through June 30, 1992 <br />Monitoring <br />Parameter Effluent Limitation Frequency/Type <br />TSS, mg/1 <br />pH, s.u. <br />Oil and Grease, mg/1 <br />Total Recoverable Cadmium, mg11 <br />Total Recoverable Copper, mg/1 <br />Total Recoverable Lead, mg/1 <br />Total Mercury, mg/1 <br />Total Recoverable Zinc, mg/1 <br />Salinity as TDS, mg/1 <br />Flow, PfGD <br />Total Cyanide, mg/1 f/ e/ <br />20!30 a/ <br />6.5 - 9.0 b/ <br />10.0 c/ <br />0.0013!0.0026 a/ <br />0.014/0.028 a/ <br />0.008410.017 a/ <br />0.000059/0.00012 a/ f/ <br />0.33/0.66 a1 <br />N/A - Monitor d/ <br />6.64 g/ <br />N/A - Monitor a/ <br />3 X Monthly/Grab <br />Weekly /Grab <br />Weekly /Grab <br />or Visual <br />3 X Monthly/Grab <br />3 X Monthly/Grab <br />3 X Monthly/Grab <br />3 X Monthly/Grab <br />3 X Monthly/Grab <br />Quarterly/Grab <br />Weekly/Instantaneous <br />or Continuous <br />Monthly/Grab <br />a/ 30-day average limitation/daily maximum limitation <br />b/ Daily minimum - daily maximum limitation <br />c/ Daily maximum limitation; a grab sample shall be taken if a visual sheen is <br />observed <br />d/ In compliance with the "Regulations for Implementaton of the Colorado <br />Salinity Standards Through the NPDES Permit Program", the permittee shall <br />continued to sample for salinity in the wastewater effluent on a quarterly <br />basis. <br />e/ See footnote e/ on page 5 of the rationale. <br />f/ Samples with mercury concentrations below the lowest present analytical <br />level of detection of 0.00025 mg/1 shall be reported as "less than 0.00025 <br />mg/1. <br />g/ 30-day average limitation for discharge point 001. Not applicable for <br />discharge points 002, 003, 004 and 005. This flow limitation is based on <br />the assumption that t}ie major source of discharge is from 001. If <br />continuous or increased flows do occur from discharge points 002, 003, 004 <br />or 005, the flow limitation will be reevaluated and may be amended. <br />All limitations other than flow are applicable to all the discharge points. <br />