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<br />-5- <br /> <br />How big are. the units of reclaimed land that will be enclosed <br />with an 8 foot fence that will remain in place for 5 years <br />after planting the area? Please show these on a map. The <br />Division is particularly interested in the amount of fencing <br />required during the point of maximum disturbance of the site <br />during the mine life. <br />Figure E-1 - How many acres of compacted clay using a <br />compactor will need to be created from the Ridgetop areas <br />developed for cottonwood groves? <br />6. Exhibit G - Water Information <br />Berhan Reffelew's evaluation of the water information on the <br />Dowe Flats site include the following concerns: <br />a. The mining plan shows the operator plane to mine the <br />headwater of the channel in the southeast portion of the <br />second ridge. <br />1. what is the peak flow for this stream or channel? <br />2. Is the entire stream going to be mined? If so, how <br />ie it going to impact the entire water balance of <br />the downstream area? Please provide quantitative <br />data to show the water contribution to the overall <br />hydrologic balance for both surface and ground water <br />eo the Division can make a determination of the <br />impact to downstream water users. <br />3. Are there plane to expand the mining beyond the 4th <br />ridge? If not are there plans to place upland <br />diversions along the maximum extensions of the pit <br />area around the northeast comer of the 3rd ridge to <br />avoid drainage from entering the unnamed drainage <br />channels on the west side. <br />b. The operator provided surface water subbasin areas. No <br />peak flows were calculated for the unnamed stream <br />channels. Please provide the peak flows for these <br />channels and the entire nub water basins. The following <br />criteria must be used to determine peak flows. <br />1. Acreage of watershed. <br />2. Type of soil. <br />3. Type of vegetation. <br />4. Slope of the drainage area or hydraulic length for <br />the evaluation should also include the impact the <br />mining operation is going to have on the overall <br />drainage water supply contribution to the irrigation <br />ditches and canal due to the creation of a large pit <br />or quarry. <br />