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April 1985. Well PAW-7 was installed in September 1988 as a result <br /> of installation of Pond 005. During 1989 all wells were sampled for <br /> water quality on a quarterly basis. Samples were taken in February, <br /> May, August and November. The annual sample was taken during the <br /> November quarterly data collection. <br /> Depth to water below the top of the well casing was measured to <br /> the nearest hundredth-foot using an electric line water level <br /> detector. The elevation at the top of the well casing was subtracted <br /> from the depth to water to obtain the ground water level below the <br /> ground surface. <br /> Water quality was sampled in the field directly from the wells <br /> with a hand bailer. The wells were cleared by bailing at least three <br /> columns of water prior to collecting the sample. Equipment and <br /> procedures used for water chemistry analysis were consistent with <br /> those described above for Surface Water. <br /> 3 . 0 MONITORING RESULTS <br /> The geologic setting is an important factor when analyzing <br /> hydrology of an area. Stratigraphy in the region of these two mines <br /> ranges in age from Pre-Cambrian to Quarternary. However, only the <br /> Raton Formation and Quarternary (alluvial) deposits were exposed in <br /> the area of the mines. The Raton Formation constitutes the bedrock <br /> of the area having a total thickness of 1200 to 1600 feet. Most of <br /> the formation consists of very fine to medium grained sandstone <br /> interbedded with siltstone and shale. Coal to be mined at the New Elk <br /> and Golden Eagle is located near the middle of the Raton Formation. <br /> The outcrop of the formation in the area may be characterized as <br /> stream deposits including channel-point bar faces, floodplain deposits <br /> and swamp deposits. <br /> -11- <br />