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CULORADU DEPAR'I'~I}';J'f OF HEALTH <br />Water Quellty Control Division <br />Rationale - Page 3 <br />Permit No. CU-UUU0:13 <br />EFFLUENT LIMITATIONS, RATlONALF, AND MONITORING FREQUENCIES: <br />Table 2 below denotes effluent limitations and the rationale which determined <br />the limitations. <br />Table 2 <br />Monitoring <br />Parameter Limitation Rationale Frequencyt <br />pH, s.u. 6.5 - 9.0 e/ WQS Weekly <br />011 and Grease, mg/1 10.0 e/ SE5 Weekly <br />Total Suspended Solids, <br />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 &/ BAT Weekly <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 applicable to discharges during periods of no precipitation <br />• and may apply to discharges during periods of precipitation. <br />g/ This limitation may apply to discharges during periods of precipitation less <br />than or equal to the 10-year, 24-hour event for this facility. <br />h/ In compliance with the "Regulation for Implementation of the Colorado River <br />Salinity Standards Through the NPDES Permit Program", the permittee shall <br />sample for salinity in the wastewater effluent on a monthly basis until sin <br />samples have been analyzed. Thereafter, monitoring shall continue on a <br />quarterly basis. The Division will review the first aiz months of data, and <br />determine if a waiver of numeric limitations cae be granted based on the <br />salt-load to the river befog leas than one ton/day (or 350 tons/year). If a <br />waiver is not granted, the permittee hoe an additional six months to submit <br />a report in accordance with the Salinity Regulations, addressing economic <br />feasability of salt-removal. <br />• R See discussion. <br />DISCUSSION: <br />1. Total Suspended Solids - E.P.A. promulgated BAT regulations on November <br />26, 1982, but BCT Beat Conventional Pollutant Control Technology) ie <br />being reserved pending finalization of EPA's BCT coat methodology. <br />Therefore, BPT shall apply. The SES limitation Sa not applicable <br />pursuant to Section 10.1.3(3) of the State Regulations foe Effluent <br />Limitations, which states that when EPA has effluent limitations for an <br />industry, the federal limitations shall take precedence. <br />• <br />1-6-30 <br />