Laserfiche WebLink
Quarterly: Temperature, Conductivity, pH, Suspended Solids, flow rate, <br />Acidity, Dissolved Solids, Suspended Solids, Chloride, Iron and <br />Manganese. <br />The Yampa River monitoring stations, Y -1 and Y -2 were monitored in conjunction <br />with the No. 9 Mine and are no longer monitored. These stations will be re- <br />established prior to the development of the North Mains. <br />E. NPDES Discharge Monitoring <br />Monitoring locations covered under NPDES permit CO- 0034142 include No. 5 <br />Mine (NPDES No. 003), No. I 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: Temperature, Conductivity, pH, Flow Rate, and <br />Oil /grease. <br />Bimonthly: Temperature, Conductivity, pH, Suspended Solids, <br />Flow Rate, Oil and Grease and Total Suspended Solids. <br />Monthly: Temperature, Conductivity, pH, Suspended Solids, Flow <br />Rate, Iron and Zinc. <br />Quarterly: Temperature, Conductivity, pH, Suspended Solids, <br />Flow Rate, Total Dissolved Solids. <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. <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 />Williams Fork Mines 23 Permit Renewal 06 <br />C- 1981 -044 December 8, 2014 <br />