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• <br />_-• <br />MINING AND RECLAMATION PLAN <br />MT. GUNNISON NO. 1 MINE <br /> <br />October, 1979 <br />Revised March, 1981 <br />Revised January 25, 1982 <br />Revised February 4, 1982 <br />At the present time, only two wells are located in the "F" seam, Wells C-76 and 23- <br />H-3. This data is not sufficient to make a piezometric map or establish a direction <br />of groundwater movement for the "F" coal seam. Well completion and location <br />data can be found in Exhibit 2.8.2. A.1 and Exhibit 2.8.I.C. <br />• <br />Groundwater samples have been obtained from nine wells by bailing. Two other <br />wells, 23-H-2 and B-16, were found to be either dry or to have water levels too low <br />to collect samples. The results of the water quality analyses are tabulated in Table <br />2.8.2.V. Incomplete information was obtained on well B-27-2 due to the well being <br />bailed dry prior to all the samples being obtained. Water quality in the wells varied <br />significantly from good to poor. Every well exceeded the recommended Colorado <br />Water Quality Standards for ammonia. Boron, lead, and manganese standards were <br />exceeded by several of the wells. Copper and fluoride limits were exceeded in two <br />of the wells (see Table 2.8.2.W). A comparison of the well water quality analyses <br />to the water quality standards recommended by the State of Colorado has been <br />performed and the information presented in Table 2.8.2.W. <br />Water quality samples taken in 1975 from two locations in the Bear Mine (Table <br />2.8.2. V) showed marked variations from other groundwater samples in some <br />constituents. Typically high values of alkalinity and sulfates and low values of <br />hardness that were measured from several other groundwater samples were also <br />found in these samples. However, high chloride values were found in the Bear Mine <br />samples. No other groundwater samples exhibited a high chloride level. Even with <br />elevated chloride levels, this water exhibits no acidity and is suitable for direct <br />discharge without treatment. <br />2.8.2.3. Current Drilling Programs <br />To further define and quantify the overburden groundwater regime on the Mt. <br />Gunnison No. 1 Mine site, a new drilling program is currently being undertaken. <br />• <br />2-303b <br />-- - - r <br />