Laserfiche WebLink
this period. These ponds are described in the Summary, <br /> "Description of Operations Plan" section of this document. <br /> References to designs for these ponds and their locations are found <br /> in Table 2.05.3 of the permit application. <br /> All pond and ditch designs were checked using Soil Conservation <br /> Service "Peak Flows" methods for compliance with the design <br /> standards in Rule 4.05. All the ponds are designed to contain the <br /> runoff from a 10-year , 24-hour runoff event and one or three years ' <br /> sediment accumulation, as predicted by the universal soil loss <br /> equation. <br /> The principal and emergency spillways of seven ponds are designed <br /> to route flow through corrugated metal pipes . Three ponds are <br /> designed with pumps as the principal dewatering mechanism. The <br /> principal spillway designs include a manually operated gate and are <br /> to be located directly above the three-year sediment storage <br /> level . Likewise, the pumps in the two ponds without principal <br /> spillways will be located above the three-year sediment storage <br /> level . The emergency spillways are designed to pass the 25-year , <br /> 24-hour peak flow. The outflow below the spillway is to be <br /> riprapped where necessary to control erosion . The permittee has <br /> submitted evidence that the sediment ponds were constructed as <br /> designed. <br /> E. Impoundments <br /> Other than sediment structures, the only impoundments existing <br /> within the permit area are sewage lagoons and sumps . A set of <br /> lagoons has been permitted near the loadout for treating water from <br /> the Roadside Mine and the loadout. An additional sewage lagoon is <br /> present near the Cameo Mine No. 1 Portal but is no longer in <br /> operation. All of these sewage lagoons are evaporative and do not <br /> discharge to surface waters . <br /> Two small sumps were proposed and constructed in the North Decline <br /> reclamation area to serve to capture and treat runoff from <br /> reclaimed lands. These sumps are adequately sized to contain <br /> runoff from a 25-year , 24-hour storm event. <br /> F. Surface and Ground Water Monitoring <br /> 1 . The permittee will conduct monitoring of ground water in a <br /> manner approved by the Division. The ground water monitoring <br /> plan is as follows : (4.05. 13( 1 ) ) <br /> The Roadside and Cameo Mines are required to submit to the <br /> Division an Annual Hydrologic Report that provides information <br /> on the water quantity and quality for both the surface and <br /> ground waters in the permitted area. In addition, quarterly <br /> NPDES reports are submitted to the Division and the Department <br /> of Health to comply with the current laws governing point <br /> sources . In the event of an effluent discharge that is not <br /> within compliance parameters , a written notice will be <br /> forwarded to the Division and the Department of Health. <br /> -21 - <br />