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<br />Memo to Gregg Squire - 2 - May 9, 1990 <br />5, They application describes a treatment method to be used for mill process <br />water and mine water discharge. <br />a. The inlet for the treatment pond is located near the same elevation <br />as the outlet. After the pond containing the peat is filled, water <br />will tend to flow directly over the top of the peat. This process <br />of "short circuiting" will reduce the effectiveness of the <br />treatment system. The Division recommends you consider a redesign <br />of the system with this consideration in mind. <br />b. The limestone may tend to become coated with iron precipitates. <br />Now frequently will the limestone bed be replaced? <br />c. The treatment system will generate solid waste. Please describe <br />the amounts and disposal location for the peat which has been <br />loaded with metals. Is this material expected to be characterized <br />as "hazardous" as defined under the Resource Conservation and <br />Recovery Act (RCRA1? If so, you are advised to consult the <br />Hazardous Materials and Waste Management Division, Department of <br />Health if off-site disposal is contemplated. If on-site disposal <br />is contemplated, a plan for refuse disposal should be prepared <br />which is designed to protect the drainage system from pollution in <br />accordance with Rule 6.1(4). <br />d. The location of the treatment facility at the mine is shown on <br />Figure 2. The treatment facility for the mill is not shown on <br />Figure 3. Where will this system be located at the mill? <br />6. A discharge of approximately 1400 gallons per day to North Clear Creek is <br />proposed. A discharge permit from the Water Quality Control Division, <br />Colorado Department of Health will need to be obtained for this <br />operation. It is likely biomonitorina will be required as a part of the <br />discharge permit. The Division requests you provide a copy of the <br />disc harae permit for our files when this becomes available. <br />7. Please address the following concerns on surface water drainage control <br />at the mine and mill. <br />a. Will runoff from the surface facilities at the mine area drain into <br />the Central City streets or storm sewer system? <br />b. Does a diversion exist above the waste rock dump? <br />c. Does surface runoff enter the mine opening? <br />d. Where does runoff from the roads at the mill drain to? <br />e. A berm is referenced to be constructed at the mill. Will this berm <br />also serve to control sediment from the mill area? <br />