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I. WATER USE ANALYSIS <br />• Water use at the Keenesburg Mine during 1990 was the same as in 1989. <br />- Office and shop potable water and wash water <br />- Evaporation <br />A. As in 1989, there was no irrigation. Of the 30.4 acres seeded in <br />1989, only one small strip along the 1985 reclamation area is <br />showing signs of recovery. Si,~ce there is no erosion on the other <br />five areas, Coors prefers to let these areas stand without reseeding <br />in order to determine if they will reseed themselves. <br />Rainfalls at the Mine during the growing months were as follows: <br />April: 0.40 inches <br />May: 2.31 inches <br />June: 0.00 inches <br />July: 2.89 inches <br />August: 0.89 inches <br />Sept.: 1.67 inches <br />Vegetation monitoring in August indicated less growth on all areas. <br />Local ranchers had a shortage of grass. This may have been due to <br />the dry month of June and may explain the poor recovery on the 1989 <br />reclamation areas. <br />B. Dust Suppression. <br />• Dust suppression was limited to the ash dump and the access road to <br />this dump. Standard procedure was to cover ash dust areas with <br />overburden rather than using water. This is required by the <br />Certificate of Designation. <br />C. Office, Shop and Washdown Needs. <br />Potable and wash water was supplied from deep well #24650-F (LFH <br />#1). Approximately 0.50 acre feet of water was used to supply <br />shower and sanitary facilities. According to the well meter, the <br />total water used was 1.95 acre feet. <br />D. Evaporation. <br />The consumptive use of surface runoff, subsurface water seeps, and <br />pit water by evaporation involved B Pit sump and Evaporation Pond #3. <br />Precipitation data for 1990 is presented in Figure 1. Gross <br />evaporation at the mine site is 45.5 inches, (from Figure 2). The <br />net evaporation for 1990 is: <br />45.5 minus .7 x 13.9" = 35.8" evaporation per year. The annual <br />consumptive use by evaporation is: The total free water surface <br />area/month x feet of evaporation/month, x monthly % of total <br />• evaporation. Adding evaporation amounts for each month a given <br />structure existed equals a total of 9.81 acre feet of water <br />evaporated in 1990. (See Table 1) <br />Page 2 <br />