HYDRO30182 - Laserfiche WebLink

Home Browse Search

Part I Page No. 4 Permit No.: CO-0045225 iv. No discharge from the lower pond is allowed except as follows: a) Overflow releases (the pond volume being exceeded) are allowed; however, the permittee must take all reasonable steps to minimize the amount of overflow, and all monitoring and notification requirements of the permit must be complied with. b) Releazes to regenerate the pond's capacity to contain the volume of runoff resulting from a 10- yr/24-hr precipitation event are authorized. The volume of water that may be rele.3sed is limited to that amount required to regenerate [he capacity to contain the volume of nutoff resulting from a 10-year, 24-hour precipitation event, for the area tributary to the lower pond. The release must be commenced within a time window of belwcen 24 hours to 48 hours following the end of the storm event which first resulted in the loss of a full 10-year/24-hour storm holding capacity. The release may lazt for a maximum of 24 hours. c) Additional discharges are allowed to the extent that the permince can provide evidence that such dischazges were, or will be, accomplished without violation of water quality standards in Cripple Creek, without discharge concentrations exceeding federal ELG's, and that the discharge is accomplished within 24 hours. 2. Haul Road a. The holding capacity of the settling pond below the haul road is just over the volume of runoff resulting from a l0-year, 24-hour precipitation event. Until commencement of reclamation of the haul road, the size of the pond in relation to the size of the drainage area must be maintained. b. The pond embankment must be constructed to withstand the peak flow azsociated with at least a 10-yr/24- hour storm event, and the downsveam face of the embanlanent must be constructed of materials that are not eazily eroded. An overflow spillway must be provided which will protect the structural integrity of the embankment, az well az avoid excessive erosion of the downsveam stream bed. c. Overflow releases (the pond volume being exceeded) are allowed; however, the permittce must take all reasonable steps to minimize the amount of overflow, and all monitoring and notification requiremenu of the permit must be complied with. 3. Crusher Area in Arequa Gulch a. The holding capacity of this pond is over three times the volume of runoff resulting from a 10-year, 24-hour precipitation event. Until all ore is removed and crushing activities cease within the area contributing flow to the pond, the size of the pond must be maintained at least 2 times the volume of runoff resulting from a l0-year, 24-hour precipitation event. b. The pond embanlmiem must be constructed to withstand the peak flow associated with at least a 10-yr/24- hour storm event, and the downstream face of the embanl~ent must be constructed of materials that are not easily eroded. An overflow spillway must be provided which will protect the structural integrity of the embardmtent, as well az avoid excessive erosion of the downstream sveam bed. c. Overflow releases (the pond volume being exceeded) are allowed; however, the permittce must take all reasonable steps to minimize the amount of overflow, and all monitoring and notification requirements of the permit must be complied with.