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:. _ • -Z • <br />4. What is the sizing of the interceptor ditches shown on Figure 3? <br />It would appear from the map that riprap, or other appropriate erosion <br />control measures, should be considered for the interceptor ditch discharge <br />points. <br />5. What is the location of the proposed interceptor trench? This site <br />should be designated on figures3 and 4. <br />6. The water quality data submitted does not indicate the units of <br />concentration for the chemical parameters measured. Please clarify. <br />7. An evaluation of water usage downstream from the tailings dam should <br />be undertaken to determine who might be affected and the extent of .the <br />effects should be anticipated. <br />8. The approximate permeability of the alluvial materials below the <br />tailings dam could be determined by conducting a simple single-hole pump <br />test. This information would make predictions of flow rates through the <br />alluvium and projections of potential impacts to the hydrologic balance more <br />reliable. <br />The proposed remedial measures seem appropriately directed and we would <br />like to facilitate their implementation. I will be contacting the State <br />Engineer and the'Department of Health to ensure their awareness and <br />cooperation in these matters. If you can supply us with the names of <br />people in these offices who are familiar with this matter it would reduce <br />the possibility for confusion and delay. <br />Please keep me posted on your progress with this matter and feel free <br />to call on me if I can be of assistance. <br />Sincerely, <br />~~ <br />Peter H. Evans <br />Reclamation Specialist <br />PE:ep <br />cc: T. Robertson <br />