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dewatering mechanism because the surrounding ground elevations are higher than the sediment <br />pond bottom elevations. The emergency spillways are designed to pass the 25-year, 24-hour <br />peak flow. The outflow below the spillway is to be riprapped where necessary to control <br />erosion. <br />With the exception of approved small area exemptions, all surface runofffrom disturbed areas is <br />routed through one of eight sediment ponds (note that Ponds 1 and 2 have been combined and <br />now form a single pond): <br />Area of Disturbance Sediment Ponds Other Structures <br /> <br />Rail Loadout Pond #1 and #2 Berrn, short ditch <br />North Portal Pond #13 Diversion, berms and ditches <br />North Decline Pond #7 Berm, ditches, sumps <br />South Portal Ponds #8, #9 Diversion, berms, pipes <br />CRDA-1 Pond #6 Berm, underdrain, ditches <br />CRDA-2 Pond # 10 Diversion, ditches <br />CBA-2 Pond #11 <br />There is no Sediment Pond #3. Former Ponds 4, 5, and 12 have been reclaimed. <br />E. Impoundments <br />The only impoundments existing within the permit area in addition to sediment ponds are <br />sewage lagoons, and three non-discharging sumps. Former Mine-water treatment pond 12 has <br />been reclaimed. A set of evaporative, non-discharging sewage lagoons has been permitted near <br />the loadout for treating water from the Roadside Mine and the loadout. <br />Two small sumps were constructed in the North Decline reclamation area and one sump was <br />constructed in the Cameo Borrow Area #1 (CBA-1) to serve to capture and treat mnoff from <br />reclaimed lands. These sumps are adequately sized to contain runoff from a 25-yeaz, 24-hour <br />storm event. <br />F. Surface and Groundwater Monitoring <br />The permittee will conduct monitoring of groundwater in a manner approved by the <br />Division. The groundwater monitoring plan is detailed in Tab 18 of the permit application. <br />Piezometers have been installed in various permit area locations to monitor water level <br />and/or quality in alluvium, refuse fill, the Rollins Sandstone and abandoned sections ofthe <br />South Portals Mine. Monitoring locations are shown on "Roadside and Cameo No.l <br />Mines Hydrologic Monitoring Map" (Exhibit 56), in Tab 18. The groundwater <br />monitoring plan is outlined below; for additional detail refer to Tab I S of the approved <br />permit. (4.05.13(1)) <br />Rapid Creek and Cottonwood Creek Piezometers <br />GWMS-OIA, OI B, 02A, 02B, 03A, and 03B, monitor water levels May and September. <br />Permit Revision No. 3 Permit No. C-1981-041 <br />July 30, 2007 Page 25 <br />