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Jim Herron -5- March 17, 1982 <br /> A. WATER SAMPLES SHALL BE TAKEN, AND WATER LEVELS SHALL BE <br /> MEASURED ON A QUARTERLY BASIS. <br /> B. WATER SAMPLES SHALL BE TAKEN TO AN APPROVED LAB AND ANALYZED <br /> FOR THE FOLLOWING WATER OUALITY PARAMETERS: <br /> pH MAGNESIUM <br /> TEMPERATURE SULFATE <br /> SPECIFIC CONDUCTIVITY IRON <br /> TOTAL DISSOLVED SOLIDS MANGANESE <br /> BICARBONATE MERCURY <br /> CALCIUM <br /> C. ALL DATA COLLECTED IN THIS MONITORING PROGRAM SHALL BE <br /> SUB14TTTED TO THE DIVISION ON A SEMI-ANNUAL BASIS. <br /> Cumulative Hydrologic Impacts - Ground Plater <br /> The only other mine in the vicinity of the Mid-Continent operations which has the <br /> potential to produce cumulative hydrologic impacts is the Snowmass mine. The <br /> edge of the workings of the two mines are separated by about 3-4 miles. Both <br /> mines are located on tributaries to the Crystal River. It is very unlikely that <br /> the individual impacts from both mines will produce a single cumulative impact. <br /> This is discussed in greater detail below. <br /> Both mines will need to dewater the coal seams and adjacent strata as part of <br /> normal operations. As discussed in the "Probable Hydrologic Consequences" portion <br /> of this document, this dewatering process will cause water levels in some aquifers <br /> to be lowered. Both operators mine the Coal Basin coal seam (named the "A" seam <br /> at Snowmass) , which is situated immediately above the Rollins Sandstone aquifer. <br /> Both operations will probably cause water levels to be lowered in the aquifer. As <br /> discussed earlier in this document, the decline in water levels should not extend <br /> more than a mile from the edge of the mine workings at the Mid-Continent operations <br /> (see "Probable Hydrologic Consequences") . Because the Snowmass operation is located <br /> in a similar hydrogeologic situation, a similar impact can be expected. Since the <br /> mine workings of the two operations are located 3-4 miles apart, no additional <br /> cumulative impact is anticipated. <br /> Both operations may individually slightly degrade the quality of alluvial ground <br /> water in the immediate vicinity of the mines (see "Probable Hydrologic Consequences") . <br /> However, the mines are located in different drainages, so no cumulative impacts <br /> are anticipated. The drainages of both of the mines are tributary to the Crystal <br /> River. Because of the distances involved and the dilution factors, neither mine <br /> should impact the Crystal River or the associated alluvial aquifer. Therefore, no <br /> cumulative impacts are anticipated. <br /> /mt <br /> cc: Dave Shelton <br />