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COLO ~-.DO DEP.~,.R~-':T C: HEALTH <br />• late: !;ualit~ Contro] Division <br />Rationale - Page 5 <br />Pe wit `:o,: CO-OD3fi:,== <br />EFFLCEST LIMITATIO;iS, R4TIONALE and MONITORING FREQUENCIES: <br />Outfal] 004 <br />Table 2 below shows the effluent limitations selected for outfall 'x`004, <br />the rationale for their selection and the frequencies of monitoring. A <br />discussion will follow to explain how the limitations were chosen. <br />Table 2 <br />Monitoring <br />Parameter Limitation Rationale Frequencies <br />Flo•.+ (MAD) N/A Monitoring l:eekly <br />Total suspended <br />Solis, (mg/1) 35/70 BPT Monthly <br />Tocai l: on (mg/1) 3.5/7.0 BAT Monthly <br />BOD3 (m~!1) 30/45 SES :Monthly <br />Fecal Co'_iform <br />(r°!1~_~0 al) 6000/12000 SES Monthly <br />Tonal ~.:=idual <br />• ;i.__-:~e ;mg/1) 0.5 SES b'eekly <br />Oil a~.' Grease (mg/1) '_0.0 SES Weekly <br />p:t (s,u,) 6.5-9.0 WQS Weekly <br />Saiir.ityl/ N/A Pfonitoring Quarterly <br />Some of the limitations above are specifically applicable to just one of <br />the wastewater sources. Bu[, because the four sources are commingled, <br />limitations must be effective for the total combined discharge. <br />Mor.ito:ing for two do¢=_s[ic wastewater parameters, BOD and TSS, will be <br />required of the ~"dTF influent, in addition to the combined effluent, to <br />deter ire [hat the wastewater treatment plan[ is operating properly (in <br />complia:ce with domestic treatment regulations), (All limited parameters <br />will be aoni[ored at [he final outfall). <br />j/ lr. compliance with the "Regulations for Implementation of [he <br />Colorado River Salinity Standards Through the NPDES Permit Program", <br />::~~; permittee shall sample fot salinity in the wastewater effluent <br />~z a monthly basis until six samples have been anal}'zed. Thereafter <br />monitoring shall continue on a quarterly basis. The Division will <br />review [he first six months of data and determine if a s+aiver of <br />numeric limitations can be granted based on [he salt-load to [he <br />river being less than one ton/day (or 350 tons/year), If a waiver <br />is not granted, [hen the permittee has an additional six months to <br />• submit a report in accordance with [he Salinity Regulations, <br />addressing economic feasibility of salt-removal. <br />