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' Ken Coa( Company 1991 Annua! Hydrology Report ~ 3 <br />3.0 MINE AREA CONFINED GROUND WATER <br />Water levels were measured and samples taken at the wells designated in the <br />Monitoring Plan during October, 1990 and April, 1991. The field data from the <br />Confined Ground Water Wells are contained in Exhibit 1, 1991 Field Data. <br />Confined ground water falls into two categories: Mine Area Coal Aquifer and <br />Mine Area Overburden. The Mine Area Coal Aquifer wells are designated as 79- <br />27, 79-32, 79-36 and 79-61. The Mine Area Overburden wells are designated <br />as 79-1 and 79-2. The individual analyses of samples collected are presented <br />in Exhibit 2, 1991 Coal Aquifer Water Quality Analyses and Exhibit 3, 1991 <br />' Overburden Water Quality Analyses. The data are summarized on Table 1, <br />1991 Ground Water Statistics. <br />' Mine Water Coal Aquifer <br />During 1991, a small amount of ground water was encountered in the mine pits <br />indicating no obvious impact on ground water resources, however, the majority <br />' of the water encountered was a result of snowmelt and precipitation. The <br />chemical makeup of the ground water in the coal aqu'rfer is sodium-bicarbonate- <br />' sulfate. The coal aquifer remains much lower in total dissolved solids than the <br />overburden aquifer, indicating perched aquifers with no intermixing. Table 1, <br />' 1991 Ground Water Statistics, presents the water quality summary for the year. <br />' For comparison purposes, the mean field parameter values and analyses <br />parameter values for the last six years are presented in Table 2, Historic Mine <br />' Area Coal Aquifer Water Quality Data. As shown all parameters show little or <br />no change over the past six years. <br /> <br />1 ACZ Inc. • PO Bnc 777013 ' Sreamboal Springs, Colorado 30177 • (3031879-0?60 <br />