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basin is being used as a source for the Preparation Plant <br /> process water . These wells , in conjunction with several <br /> additional observation wells , serve to monitor groundwater <br /> quality . The depth to the water table varies from the <br /> ground surface to a depth of 20 feet . The wells are plotted <br /> on Exhibit IV-C-1 . The water quality collected by the U . S . <br /> Geological Survey is summarized in Table III-E-1 and plotted <br /> on a trilinear diagram Figure III-E-2 . Based on the analysis <br /> the water is classified as a calcium, sodium, magnesium <br /> bicarbonate type with a total dissolved solids of approximately <br /> 347 milligrams per liter . Iron and manganese are the only <br /> parameters that appear to have a high dissolved concentration <br /> although acceptable for domestic use . <br /> Water that develops in the mines is <br /> used during the mining process , <br /> allowed to migrate downdip either in the Coal or <br /> the underlying Rollins Sandstone Unit or <br /> pumped at a rate of 40 to 300 gpm from the mine . <br /> Based on mine pump records (Table III-E- <br /> 2) the amount of pumped water increases during the spring <br /> and significantly decreases during late fall and winter . <br /> (2) Consolidated aquifers water quality <br /> The knowledge of groundwater quality of <br /> the Mesaverde aquifers is limited . During a USGS survey <br /> only one well was located in Mesaverde Group and this well <br /> was reported to be a calcium bicarbonate type with a total <br /> • dissolved concentration of 181 milligrams/liter . <br /> 7 <br />