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• COLORADO DEPARTMENT OF HEALTH <br />Water Quality Control Division <br />Rationale - Page 11 <br />Permit No. CO -0034142 <br />EFFLUENT LIMITATIONS, RATIONALE AND MONITORING FREQUENCY: (Continued) <br />TABLE 6 <br />(Outfall 023) <br />Monitoring <br />Parameter Limitation Rationale Frequency <br />Flow, MGD <br />PH, s.u. <br />Oil 6 Grease, mg/l <br />TRC, mg/l <br />BOD5, mg/l (lb/day) <br />TSS, mg/1 (lb/day) <br />FC, no/100 ml <br />Organic Loading <br />Capacity, lb/day: BOD <br />Salinity <br />0.012 <br />6.0-9.7 <br />10 <br />0.5 <br />30/45 (3.0/4.5) l/ <br />75/110 (7.5/11.0) 1/ <br />6000/12000 <br />25 <br />NA <br />• l/ 30 -day average/7-day average <br />2/ influent monitoring required at same frequency <br />DISCUSSION: <br />1. Outfall 003 designation <br />Design Flow <br />Weekly <br />SES <br />Weekly <br />SES <br />Weekly <br />SES <br />Weekly <br />SES <br />Monthly 2 <br />SES <br />Monthly 2 <br />SES <br />Monthly <br />SES NA <br />Monitoring Quarterly <br />The previous permit incorrectly designated outfall 003 as discharging to <br />the Yampa River. This renewal will correct this. <br />2. Total Recoverable Metals <br />By federal register of September 26, 1984, EPA now allows the use of total <br />recoverable metals effluent limitations in permits. Such limitations are <br />no more restrictive than total metals limitations and may be less <br />restrictive. This change will not alter the sampling and sample <br />preservation technique, but does warrant a change in the analytical <br />procedure. It is therefore important that the permittee alert its <br />laboratory to this change. <br />3. Dissolved Oxygen Monitoring <br />It is important that the permittee maintain a dissolved oxygen content of <br />2.0 mg/l or greater within the domestic lagoon system. Low D.O. in the <br />. lagoon may result in high BOD5 concentrations in the effluent and <br />subsequent permit violations. <br />