GENERAL55820 - Laserfiche WebLink

Home Browse Search

~: As shown in the Espey, Huston 8 Associates report (page c-34a and appendix R of the permit application) the 1JotF~ern No. 1 Sedimentation Pond is designed to contain the 10 Year-24 hour storm. Also the spillway was designed to Safely pass the 25 year-24 hour event. The amount the 1,- inch gated spillway on the Northern No. 1 Sedimentation Pond r...:-t be opened to allow for automat lc deuatering with an average rEi•_~:ion time of 24 hours is 2 inches (see attached calculations). FF'F rC OISPOSA - RR R FOND • `J Rs shown fn the Es.p ey, Huston b Associates report (pages 13-11 and 13-52 of the mine per-~n~t application) the F,•~fuse Disposal Sedimentation Pond is designed to cc•-.tain the 10 year-~-l hour storm. Also the sp SllwaY was designed to safely pass the ~. •~~e ar-24 hour event. The Refuse Disposal ~,rcr wand has an opera This pond was evid Exit ];• designed to average retention tirc~~ of 24 hours. The maintain an average retention time of 24 second (see attachetl calculations). The . inch iron pipe using the Haz in-Wi11iaR~ F~ cubic feet per second (see attached calci~ an average retention time of approximatEi. inch iron outlet pipe. ~ticaly dewater with an tity of flow required to is 0.84 cubic feet per :r,~Vm flow through the 6 la was found to be 0.74 .`ons). Therefore providing hio urs. As shown in Rppendix ^-2R3 & 4, Modific<~ ~,~ No. 2 of the permit application and the Panorama Resource Ser•c~:~rs report of Rugust 1, 1984 the Sedimentation Pond A was constructed tc• r.ontain in excess of a 10 year-24 hour event. Also the spillway was _=_ianed to pass safely the 25 year-24 hour event. The amount the 12 inch gated spillway on the Rienau No. 2 Sedimentation Pond A rrK+st be opened to allow for automatic dewater ing with an average retention period of 24 hours is 1.5 inches (See attached calculations).