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COLORADO DEPARTMEiJT O~ALTH • <br />'.Jzter Quality Control ision <br />Summary of Rationale Page 2 <br />PERMIT IJUMBER: CO-0036731 <br />• <br />• <br />Proposed Effluent Limitations and Rationale <br />Parameter Limitations Rationale <br />pH (standard units) 6-9 State Effluent Standards <br />Oil and Grease (mg/1) 10 State Effluent Standards <br />Total Suspended Solids (mg/1) 20,30 Best Practicable Technology <br />Total Copper (mg/1) 0.15,0.30 Best Practicable Technology <br />Total Zinc (mg/1) 0.75,1.5 Best Practicable Technology <br />Total Lead (mg/1) 0.3,0.6 Best Practicable Technology <br />Total Mercury (mg/1) 0.001,0.002 Best Practicable Technology <br />Salinity N/A Monit oring Only <br />Discussion: <br />A. Salinity <br />On 11arch 7, 1973, the Colorado Water <br />Quality Control Commission adopted the <br />"Regulation for Implementation of the <br />Colorado River Salinity Standards Through <br />[he NPDES Permit Program." <br />The first step towards complying with the <br />regulation for the permit will be monitoring <br />for salinity on a monthly basis for the <br />first six (6) months. Thereafter, monitoring <br />will be a quarterly basis. Monitoring will <br />be required at the wastewater discharge. <br />Analysis for salinity may be either as <br />Total Dissolved Solids (TDS) or by <br />electrical conductivity where a satisfactory <br />correlation ~~ith TDS has been established. <br />The correlation should be based on a <br />minimum of five (5) different samples. <br />L J <br />