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3.0 <br />3.2.4 Bedrock Groundwater <br />Basin monitored the overburden and the coal seams adjacent to the mine. The five overburden wells were <br />completed in zones of elevated flow during drilling, and consequently reflect different strata. Two overburden <br />wells located north of the workings, NM-20 and NM-22 exhibited very alkaline conditions (pH ranging from <br />9.9-11.85) and were sodium carbonate waters. They have moderate salinitywith conductivities ranging.from <br />400 - 504 mg/1. There are four coal wells associated with the monitoring program. Site NM-23, north of the <br />Golden Eagle workings is a slightly acidic (pH 5.74 - 6.2), very saline (TDS of 2400 mg/1) sodium iron <br />chloride water. Previously this was an excessively alkaline (pH 9.4 - 11.46) sodium bicazbonate water. Again, <br />there is some thought that the pump extraction process modified the chemistry of the water. This site has <br />elevated iron concentrations, and levels of manganese and chloride which exceed ground water standazds. No <br />water quality samples were collected from deep wells during 2002 as a result ofthe new monitoring program. <br />Water quality of the mine workings have been monitored as the mine is allowed to fill. Water samples have <br />been collected at GEM-1 since 1999 and GEM-2 since 2002. The water is a sodium bicarbonate type with <br />elevated salinity (TDS ranging from 1260 to 1540 mg2). Figure 3.2-2 shows water quality at the two GEM <br />stations. <br />292-2002 AH Report (Mar.03.03)_rev2 12 <br />