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Alma Placer Mine <br />M-1985-029 <br />Addendum to Mining Plan -Item 1.2 Sediment Control Systems for Gold Operations <br />To Allow Use of Flocculent Chemical <br />August 3, 2006 <br />1. Background Data <br />Currently, the permittee (Ducommun Trust) is using Gerry Miller as the operator for the <br />gold operation. The gold operation is using 3000 gallons per minute of water from the <br />South Platte point of diversion to pump into Pond A where a second pump pumps the <br />water into the portable gold plant. Here the water is used to wash the gravel and remove <br />the gold particles. The gold operator has tried to settle the water in a series of ponds to <br />remove the suspended solids after washing but this has had very little success. Although <br />there have not been any water discharges from the site, the gold operator has decided that <br />a flocculent is the most efficient way to settle the suspended solids. The following pages <br />describe the flocculent, which is an anionic wet flocculent Hyperfloc AF852 produced by <br />Hychem, Inc. Of California. This chemical is not harmful to fish or other animals unless <br />it is dumped in full concentration directly into the River in large quantities. See attached <br />Material Data Safety Sheets. It is safer than many other chemicals used for flocculating <br />dirty waters today and the City of Denver is using it in its drinking water plants. <br />2. Stem Desien <br />As shown on the revised Map C-4 -Mine Hydrology, the discharge from the sluice will <br />enter the existing Gold Pond 1 where most of the -1/2" material will settle out naturally <br />due to its size. This pond leads to a 10 feet wide channel where a 18" CMP will be <br />placed in the channel over a length of 20 feet. One 500 gallon tank, and possibly another <br />backup tank (polyurethane or steel) will be used to contain the water and the chemical <br />prior to introduction in the flow channel. The tank will be used for storing and <br />distributing the wet chemical with water at the ratio of 1 gallon liquid chemical per hour <br />8/7/06 Addendum to Sediment Control System Page 1 <br />