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•1 1 <br />COLORADO DEPARTMENT OF HEALTH <br />• Water Quality Control Division <br />Rationale - Page 2 <br />Permit No: CO-0036684 <br />rFFLUET~T LI"ffTATIONS: <br />Discharge limitations for discharge point 001, during dry weather, are outlined <br />in Table 1 below. <br />TABLE 1 <br />Parameter <br />• <br />Flow <br />pY., (s.u.) <br />Total Suspended <br />Solids (mg/1) <br />Total Iron (mg/1) <br />Oil and Grease, (mg/1) <br />Salinity <br />1/ k'ater Quality Standard <br />Monitoring <br />Limitation Rationale Frequency <br />Ar/A Monitoring Weekly <br />6.5 - 9.0 WQS 1/ Weekly <br />35/70 BPT ?/ Monthly <br />3.5/7.0 BAT 3/ Monthly <br />10.0 SES 4/ Weekly <br />Monitoring Colorado River 5/ Quarterly <br />Salinity Regulations <br />2/ Under HAT, EPA has withheld Best Conventional Technology for TSS. Thus <br />BPT limitations will apply. BPT: Best Practicable Control Technology <br />Currently Available. <br />3/ Federal Best Available Technology Economically Achievable <br />4/ State Effluent Standard <br />5/ Monitoring will be required under the "Regulations for Implementation of <br />the Colorado River Salinity Standards through the CDPS Permit Program". <br />The permittee shall sample for salinity on a monthly basis uatil six <br />samples have been analyzed. Thereafter monitoring shall continue on a <br />quarterly basis. The Division will review the first six months of data <br />and determine if a waiver of numeric limitations can be granted based on <br />the salt-load to the river being less than one ton/day (or 350 <br />tons/year). If a waiver is not granted, then the permittee has an <br />additional six months to submit a report in accordance with the Salinity <br />Regulations, addressing the economic feasibility of salt removal. <br />• <br />