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<br />COLORADO DEPARTMENT OF HEALTH <br />Water Quality Control Division <br />Rationale - Page 4 <br />Permit No. CO-0035653 <br />EFFLUENT LIMITATIONS, RATIONALE AND MONITORING FREQUENCIES: (Continued) <br />e/ This limitation shall apply at all times. <br />f/ This limitation shall apply to discharges during periods of no <br />precipitation and may apply to discharges during periods of precipitation. <br />g/ This limitation may apply to discharges during periods of precipitation <br />less than or equal to the 10-year, 24-hour event for this facility. <br />h/ In compliance with the "Regulations for Implementation of the Colorado <br />River Salinity Standards Through the NPDES Permit Program", the permittee <br />shall sample for salinity in the wastewater effluent on a monthly basis <br />until si: samples have been analyzed. Thereafter, monitoring shall <br />continue on a quarterly basis. The Division will review the first six <br />months of data and determine if a waiver of numeric limitations can be <br />granted based on the salt-load to the river being less Chan one too/day <br />(or 350 tone/year). Lf a waiver is not granted, the permittee has an <br />additional eiz months to submit a report i^ accordance with the Salinity <br />Regulations, addressing economic feasabillty of salt-removal. <br />The proposed effluent 1lmitationa for outfalls 002, 003, 004 and 005 are show <br />Sa Table 4 below, as are the rationale for their choice and the monitoring <br />frequencies. <br />Table 4 <br />Monitoring <br />Parameter Limitation Rationale Frequencies <br />Flow, MGD NA Monitoring Monthly <br />pH, s.u. 6.5-9.0 YQS Monthly <br />011 and Grease, mg/1 10.0 SES Monthly <br />Settleable Solids, ml/1* 0.5 BAT Monthly <br />Salinity NA Monitoring Quarterly <br />=This parameter is not applicable to discharges caused by precipitation <br />greater than the 10-year, 24 hour event (ar equivalent enowmelt volume). <br />