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November. The annual sample was taken during the November quarterly <br /> inspection. <br /> Depth to water below the top of the well casing was <br /> measured to the nearest hundredth-foot using an electric line water <br /> level detector . The elevation at the top of the well casing was <br /> subtracted from the depth to water to obtain the ground water level <br /> below the ground surface. <br /> Water quality was sampled in the field directly from the <br /> wells with a hand bailer. The wells were cleared by bailing at least <br /> three columns of water prior to collecting the sample . Equipment and <br /> procedures used for water chemistry analysis were consistent with those <br /> 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 the <br /> area of the mines . The Raton Formation constitutes the bedrock of the <br /> area having a total thickness of 1200 to 1600 feet . Most of the <br /> formation consists of very fine to medium grained sandstone interbedded <br /> with siltstone and shale. Coal to be mined at the New Elk and Golden <br /> Eagle is located near the middle of the Raton Formation. The outcrop <br /> of the formation in the area may be characterized as stream deposits <br /> including channel-point bar faces, floodplain deposits and swamp <br /> deposits . <br /> Alluvial deposits along the Purgatoire River are complex. <br /> The headwaters of the river are underlain by volcanic rocks and <br /> sediments . As it flows to the east, the river cuts its way through <br /> many different geologic formations including Pleistocene <br /> glacial-fluvial sediments, foothills belt of Paleozoic-Mesozoic strata, <br /> -11- <br />