Laserfiche WebLink
The flocculent will allow all solids to settle out in the initial area of the sluice tails pond. This pond <br />is excavated in native material — glacial debris and alluvium, and has shown itself to not drain to the <br />surrounding area. As the pond is used, silt and fines will build up within the pond, further reducing <br />its permeability. <br />Material safety data sheets for the Hyperfloc chemical can be found in Appendix 2. <br />5.2 Pond Cleanout <br />Using the laboratory test result of 3.4% solids in the dirty water, this means that, for a total flow of <br />185 cubic feet/minute, the solids are 6.3 cubic feet per minute. Assuming that the settled solids have <br />40% water by weight, this means that 8.8 cubic feet/minute of "muck" will be produced from the <br />sluice. For 10 hours of operation, this is 5,280 cubic feet per day, or 196 cubic yards. Cleanout of <br />the pond will may not be needed since the pond area will be reclaimed by the deposition of sluice <br />tails, however, some quantity of fines may be used as a topsoil substitute for reclamation or <br />backfilling purposes elsewhere, and these calculations provide an estimate of how much material <br />could be provided. Any muck extracted will be allowed to drain for a few days and the semi -dry <br />material will be hauled to various locations on site for possible use as substitute topsoil in the <br />reclamation. Much of the water will drain rapidly from the muck as it is placed on the bank along <br />the pond. The dry solids removed from the pond are expected to be approximately 116 cubic yards. <br />5.3 Water Transmission <br />The sluice pond is not lined with a synthetic liner. The pond has been excavated in native material which <br />has a significant proportion of fines within it. The ground water table (which is the alluvial aquifer of the <br />river) is at least 100 feet below the sluice pond bottom. Sluicing operations into the pond will decrease the <br />permeability of the pond even further, as silt and fines build up in the bottom. Water will leave this pond in two <br />ways: recycling to the sluice itself, and evaporation. Infiltration will be negligible. <br />It is also known that the ponds cannot be receiving spring water to any significant degree since the water <br />table is at least 100 feet below the bottom of the ponds. <br />Any overflow from the sluice ponds will be contained on site by the existing site berms. <br />Fairplay Au Pit March 201 .7 D-7 X <br />