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Pond <br />Stormwater <br />Basin <br />10 -YR Event <br />Runoff <br />25 -YR Event <br />Runoff <br />100 -YR Event <br />Runoff <br />Pond <br />Capacity' <br />Sediment Pond 1 <br />SWB -6 <br />0.55 ac -ft <br />0.84 ac -ft <br />1.05 ac -ft <br />1.06 ac -ft <br />Sediment Pond 2 <br />SWB -7 <br />0.39 ac -ft <br />0.66 ac -ft <br />0.87 ac -ft <br />1.59ac -ft <br />Sediment Pond 3 <br />SWB -8 <br />0.07 ac -ft <br />0.15 ac -ft <br />0.21 ac -ft <br />0.48 ac -ft <br />Table G -7 — Pond Capacities <br />easure d at the emergency spillway <br />4.6 Site Discharges <br />There are three discharges from sediment ponds. These are Outfalls 001,002, and 003 in the CDPHE <br />Discharge Permit. All sediment ponds will be designed to fully contain the 25 -YR 24 -HR storm inflow <br />from their respective drainage areas and will only discharge when a very large event occurs. For <br />normal operation, the 4" primary spillway pipe will remain closed and will only discharge when the <br />water passes the CDPHE discharge limits. This is expected to be within 72 hours of any storm event. <br />The ponds will be emptied as soon as possible following a storm event to maximize available capacity <br />for future events. <br />Revenue Mine August 2012 G -22 <br />