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i <br /> COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br /> Rationale - Page 3. Permit No. CO-0039136 <br /> II. EFFLUENT LIMITATIONS, RATIONALE AND MONITORING FREQUENCIES: <br /> Table 2 below denotes effluent limitations and the rationale which <br /> determined the limitations. <br /> TABLE 2 <br /> Monitoring <br /> Parameter Limitation Rationale Frequency <br /> pH (s.u.) 6.5 - 9.0 e/ WQS Weekly <br /> Oil and Grease (mg/1) 10.0 e/ SES Weekly <br /> Total Suspended <br /> Solids (mg/1) 35/70 f/ BPT Monthly <br /> Total Iron (mg/1) 3.5/7.0 f/ BAT Monthly <br /> Settleable Solids (ml/1) 0.5 g/ BAT Monthly <br /> Flow (MGD) Monitoring only N/A Weekly <br /> Salinity Monitoring only N/A Quarterly h/ <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 <br /> precipitation. <br /> / 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 <br /> permittee shall sample for salinity in the wastewater effluent on a <br /> monthly basis until six samples have been analyzed. Thereafter, <br /> monitoring shall continue on a quarterly basis. The Division will <br /> review the first six months of data, and determine if a waiver of <br /> numeric limitations can be granted based on the salt-load to the river <br /> being less than one ton/day (or 350 tons/year) . If a waiver is not <br /> granted, the permittee has an additional six months to submit a report <br /> in accordance with the Salinity Regulations, addressing economic <br /> feasability of salt-removal. <br />