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-13- <br /> • <br /> holes to Leases 0-047201 , C,-0126699 and C-8425, the Division concurs that the <br /> lab analyses submitted provide adequate representative data for areas to be <br /> mined during the present permit term. However, during the next permit term <br /> when underground mining progresses into Leases C-8424 and C-8425, <br /> representative samples of roof and floor rock from each of the two lease areas <br /> will be submitted to the Division. Sample analyses will be submitted prior to <br /> the development of workings within either of the two new lease areas. <br /> The operation is in compliance with the requirements of this section. <br /> V. Hydrolo is Balance; Surface Water - Rules 2.04.5, 2.04.7, 2.05.3(4) , <br /> and 4.Ub <br /> The Deserado Mine baseline °hydrologic conditions were established by the <br /> results of a detailed hydrologic inventory conducted by Vaughn Hansen <br /> Associates of Salt Lake City, Utah on behalf of Western Fuels Association, <br /> Inc. The hydrologic data and analyses are contained in Section II.0 of the <br /> Deserado Mine mining permit application. A summary of the Deserado Mine <br /> baseline hydrologic conditions, is presented in the following paragraphs. <br /> The Deserado Mine area is drained by portions of two watersheds which are <br /> tributary to the White River. Scullion Gulch and tributaries are an ephemeral <br /> watershed consisting of about 7560 acres which drains the southern and western <br /> portions of the Deserado Mine area. Red Wash and its tributaries are much <br /> • larger consisting of 78,400 acres and draining the eastern and northern <br /> portions of the Deserado Mine area. The upper reaches of Red Wash are <br /> intermittent. Water flow in either of the streams within the Deserado Mine <br /> area is in response to thunderstorms or rapid snow melt runoff. Surface flows <br /> ranged from 45 cubic feet per second (CFS) to 185 CFS in Scullion Gulch for <br /> thundershower and snowmelt events respectively. Flows in Red Wash ranged from <br /> 8 CFS to 240 CFS for thunderstorm and snowmelt events, respectively. <br /> The mean annual flow of the White River was estimated as 672 cubic feet per <br /> second or about 486,000 acre-feet per year. Monthly flow distribution from <br /> 1972 to 1978, as estimated from the U.S.G.S. gaging station above Rangely, <br /> indicates that about 43 percent of the annual flow of the White River occurs <br /> (in the Deserado Mine Vicinity) during the months of May and June, the result <br /> of snowmelt runoff from higher elevations in the drainage basin. <br /> Surface Water Quality <br /> The results of water quality analyses run on collected water samples indicate <br /> that surface water in the Deserado Mine area is predominantly of the <br /> calcium-sulfate type. Ionic concentrations of sodium and magnesium approach <br /> and occasionally exceed those of calcium. The normally high calcium and <br /> magnesium concentrations in the area relative to sodium result in low sodium <br /> adsorption ratios. <br /> Total dissolved solids concentrations in the area are quite variable, both <br /> • spatially and temporally. iNo significant difference exists between dissolved <br /> solids contents of the White River above and .below the Deserado Mine area <br /> tributaries. As expected, '' dissolved solids concentrations of the White River <br /> vary inversely with flow, with the lowest concentrations coming during periods <br /> of high flow, primarily in' the months of May and June when most of the flow is <br /> derived from snowmelt. Data collected during the snowmelt period in April <br /> l� <br />