APPCOR12349 - Laserfiche WebLink

Home Browse Search

610.41 HYDROLO~ DAL.4:dCE (con't) • EFC has tal-en appropriate measures to prevent increases in erosion and provide detention to ensure that suspended solids are less than the effluent limitations. All reco~rmended practices have been planned. In addition, check da~.s and contour furrowing will be used to detain sediment close to its source. These measures are described in detail in later sections. 3. Description of Applicant's ?roposal The Eckman Park watershed is approximately 3200 acres. All runoff from this area will eventually be detained in Pond A. A11 mining is on areas tributary to South Fork. Per~anent diversion - ditches will is*_ercept surface flow upstream and downstream of the two pe rnanent spoil areas. One of these locations is on a sloe drain to a tributary of South Forl;. Permanent ditch 2b-1 prevents upstream overland flow from entering the spoils area to minimize water quality degradation. Permanent ditch 2b-2 will take runoff from the spoils along a path designed to minimize channel gradient. The flow is returned to the natural streambed in a manner designed to minimize erosion. The second spoil pile will be located in the east fork of Foidel.Creek, just upstream from Pond A. Two percanent diversion ditches will take surface runoff directly into Pond A. Runoff upstream of the spoil will be prevented from entering the spoil by diversion ditches. These same ditches intercept the runoff from the spoil itself. Temporary ditches in the Eckman Park area will be used to collect surface runoff before it enters the mining area. After they are no longer needed, the temporary ditches and affected area of Sediment Pond A will be regraded and revegetated. The permanent diversion ditches will be repaired, cleared and revegetated as necessary. They are designed as grass-lined channels during all phases of use. The permanent diversions and sediment pond will be constructed before any disturbance of the surface. Contour furrowing and check dams will be regraded to match original contours and drainage patterns after mining is completed.