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• (c)(i) Mine inflows will not be impounded above the normal ground level at the lowest <br />portal. In the Roadside South Mine, water will be allowed to fill abandoned areas <br />below an elevation of 4762 feet; the ground elevation of the Northwest Intake <br />portal. A siphon has been installed in this portal seal to allow discharge through <br />outfall 002 of the NPDES permit. <br />During March of 2000 a 4-inch diameter pipe was installed from the No. 2 South <br />Mains Sump to outfall 001. The pipe penetrates the South Portal seal as shown <br />on Figure 14-2. The pipe intercepts water that flows to the Northwest Intake <br />Pool and therefore increases the overall mine discharge capability. <br />The Roadside North Mine is entirely below the portal elevation and will fill to the <br />normal groundwater level which is approximately 50 feet below the reclaimed <br />surface at the portal area. <br />• <br />• <br />17-6 (Rev 3/01/00) <br />