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Quarterly: <br />Temperature Acidity (CaCO3) <br />Conductivity Dissolved solids <br />pH Iron <br />Suspended solids Manganese <br />Flow rate <br />E. NPDES Discharge Monitoring <br />Monitoring locations covered under NPDES permit CO-0034142 include No. 5 <br />Mine (NPDES No. 003), No. 1 Strip Pit (NPDES No. 022), 7 North Angle Well <br />(NPDES No. 024) and Sewage Treatment Ponds (NPDES No. 023). The first three <br />locations are monitored weekly, bimonthly, monthly, and quarterly for the <br />following parameters: <br />Weekly Bimonthly <br />Temperature Same as weekly <br />Conductivity plus suspended <br />pH solids, <br />Water level/ visual oil and <br />Flow rate grease, <br />Visual oil zinc <br />and grease <br />Monthly uarterl <br />Same as Bimonthly <br />bimonthly parameters <br />plus Iron plus total <br /> dissolved <br /> solids <br /> WET (acute) <br />Whole Effluent Toxicity (WET) testing for Chronic Biomonitoring is required for <br />outfall 003. <br />The sewage treatment ponds (outfall 023) require weekly analyses for oil and <br />grease (visual), residual chlorine, pH, and flow rate weekly, plus monthly analyses <br />for BOD (five-day), suspended solids, and fecal coliform. Total dissolved solids are <br />analyzed quarterly. Outfall 023 is exempt from WET testing requirements. <br />F. Probable Hydrologic Consequences <br />Projected Impacts <br />Section 2.05 of the permit application includes an assessment of the probable <br />hydrologic consequences of the mining operation. Those consequences are <br />summarized as: <br />1) Maximum inflow of ground water into the mines during mining will be an <br />estimated 2490 gpm. <br />2) Continued drawdown in the Middle Sandstone will be the most significant <br />impact caused by Mines 5 and 6. <br />Eagle Mine Complex 22 Permit Renewal 05 <br />C-1981-044 May 22, 2009