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42.04 APPLICATION FOR PERMIT FOR SIIRFACE OR UNDERGROUND MINING ACTFVITIES -- <br />_ MINIMUM REQUIREMENTS FOR INFORMATION ON ENVIRONMENTAL RESOURCES, <br />• <br />2,04.7 Hydrology Description: <br />(2) Surface Water Information. <br />(a) and (b) (Cont'd,) <br />location of Node 22 <br />the water flows int <br />River. Run-off from <br />into a sedimentation <br />Roatcap Creek, then <br />Gunnison River. For <br />face water, see Part <br />on Map 8-1, From this location, <br />o the North Fork of the Gunnison <br />the Orchard Valley F?est Mine flows <br />pond which is discharged into East <br />flows into the North Fork of the <br />a more detailed discussion of sur- <br />2.05.4. <br />Applicant has implemented a continuing monitoring pro- <br />gram as described in Section 2,05.6(3) within the per- <br />mit area to continually update a hydrologic budget for <br />the affected areas. The precipitation-run-off rela- <br />tionship is modified by evapo-transpiration demands of <br />native vegetation, During the period May through Sep- <br />tember, the hydrologic regime is in deficit due to de- <br />mand of native plant communities. July through AugusC <br />are probably the most critical months when annual stor- <br />• age from soil, ponds, and intermittent springs is de- <br />pleted by evapo-transpiration processes. Areas of <br />larger storage capacities such as Steven's Gulch, Mor- <br />rell Cow Camp, and East Roatcap Creek (Long Draw) are <br />depleted due to man-made withdraws. <br />October through March are peak precipitation periods, <br />mainly from snow pack. The near surface storage is re- <br />plenished from melting of the snow pack and attendant <br />run-off, during March through July. <br />In summary, affect on the surface water resources from <br />Orchard Valley Mine faciities are low and are also an- <br />ticipated to be low at the Orchard Valley West Mine. <br />It should be noted that the Orchard Valley and Orchard <br />Valley West Mines are designed in such a way as to be <br />virtually a "closed" hydrologic system. This means <br />that water from all disturbed areas is routed through <br />sediment retention ponds or vegetative buffers. For an <br />historical discussion of water quality in the mine plan <br />area, see Semiannual Water Quality Update ReporC - Or- <br />chard Valley Mine Area, April - October, 1978, by <br />Robert C. Erickson. Summarized, it states: <br />• Added 12/26/84 <br />Added 10/12/86 <br />Revised 10/12/86 <br />Revised 1Of01/87 <br />53 <br />