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24 <br />effluent limits at Pond 007 may be exceeded. Thus the operator will operate this pond <br />with the gates normally closed, until such time as it can be demonstrated, either by <br />maintenance or reclamation practices, that effluent limitations will be met. All <br />sampling during discharge events will be conducted in accordance with the approved <br />NPDES permit to determine actual compliance with limitations. <br />The SedCad analysis for Ponds 005 and 007 was an analysis of an installed <br />perforated riser at each pond under existing sub watershed conditions that had been <br />previously analyzed in the permit. The data used in this analysis, including <br />watershed area calculations, was taken from calculations performed for the design <br />specification of Pond 5 and 7 in Exhibit 19 of the permit. The drainage areas map in <br />Exhibit 19 shows the watershed drainages for ponds 5 and 7. Drainage area 005-1 is <br />the total drainage area for Pond 005. Drainage areas 006-1 through 006-5 and 007-1 <br />through 007-6 all constitute the total drainage area for Pond 007. The operator will <br />also open the gates on all other sites. A staff gage will be installed on or adjacent to <br />the riser pipe of Pond 007 identifying the water level (7373.3 ft.) adequate to retain a <br />10 -year 24-hour storm without discharging over the emergency spillway. This <br />elevation was arrived at through a review of the Pond 007 as -built stage volume <br />curve dated 5/31/85 in Exhibit 19. The crest invert emergency spillway volume is 9.2 <br />acre-feet and the l 0 -yr 24 -hr runoff volume is 6.6 acre-feet, resulting in an allowable <br />permanent storage and sediment volume of 2.6 acre-feet. <br />The operator has received approval from CDPH&E, Water Quality Control Division <br />to use a flocculent to settle suspended solids in pond water during emergency <br />situations of for water discharges associated with pond cleaning activities. <br />All materials removed through the cleaning or excavation of sediment and/or <br />treatment ponds will be disposed of at the development wastes pile. <br />Exploratory holes will be drilled within the permit boundary. Run-off from the <br />related drill pads may not go through a treatment facility such as a sediment pond. <br />Run-off from the pads that does not report to a sediment pond will be filtered through <br />a sediment fence. Design of sediment fences for drill pad configurations are <br />presented in Exhibit 19(20) pages 1-17. The typical sediment fence configuration <br />and berms are shown on Map 25. <br />Silt fences will be used to treat run-off from exploration holes drilled along the rail <br />corridor similar to what is shown on Map 25. The rail corridor is considered an <br />industrial area. Once the rail corridor drill site is re -graded, no ongoing <br />sedimentation control is required. <br />Section 2.05 RN -6 10/17/2016 <br />