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42.05 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES -- <br />MINIMUM REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. <br />2.05.6 Mitigation of Surface Coal Mining Operation Impacts. (Cont'd.) <br />(3) (b) (iv) (Cont'd.) <br /> <br />n <br />U <br />reported that silt-charged streams deposited <br />sediment in mining-induced cracks minimizing <br />water infiltration into iron ore mines in Ala- <br />bama. <br />The significance and material damage to ephem- <br />eral streams from subsidence-induced cracks <br />will be minimized by continual stream monitor- <br />ing, correlation to precipitation events, and <br />quick detection and repair to stream channels <br />(refer to Subsidence Repair Handbook, Volume <br />3). The duration of any impact upon stream <br />flow would be very short term and CWI believes <br />temporary and permanent repair could be accom- <br />plished in several days. Riparian habitat, <br />aquatic life, and downstream water users would <br />not be affected. In the unlikely event that <br />repair is not sufficient to preclude down- <br />stream water user effects, a water replacement <br />plan has also been proposed with the change in <br />Overland Ditch water being diverted down West <br />Roatcap Creek, no irrigation conveyance system <br />will be undermined. West Roatcap Creek and <br />Terror Creek streambeds will not be under- <br />mined. Also, East Roatcap Creelc and Steven's <br />Gulch will be protected by BLM stipulated buf- <br />fer zones and reduced recovery plans are de- <br />scribed in Subsidence Control Plan, Section <br />2.05.6. <br />Because of the interrelationship between co1- <br />lw ial springs and ponds, the conseouences for <br />ponds are included in the discussion of <br />springs. <br />The probable hydrologic consequences for the <br />existing Orchard Valley Mine site and permit <br />area would change little with the construction <br />of the Orchard Valley West Mine. Calculations <br />and projections for the probable hydrologic <br />consequences of construction of the Orchard <br />Valley West Mine facilities are included in <br />the Hydro-Geo, Inc. report in Volume 4. <br />Added I2/Z6 /84 <br />Revised 10/12/86 <br />Revised 10/01/87 <br />134 <br />