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• Within the azea of the nearest adjudicated water well, the uppermost strata which will <br />be disturbed in the planned pit will be 1,000 feet below the bottom of the Hoverman <br />well. It should be noted that there are no water wells drilled deeper than 400 feet in <br />this azea (See Table 4-4). Most wells in this area aze shallow wells drilled in canyon <br />bottoms, which contain limited thicknesses of colluvium, alluvium and slope wash. <br />All water wells in this area are domestic producing IS gpm or less than 15 gpm. <br />Oakridge is the surface owner of the permit and adjacent areas and as such has water <br />rights for groundwater resources. <br />As can be seen from the above, one to three water bearing zones exist above the coal <br />seams to be mined. The zones are perched water existing in fractured strata and are not <br />considered to be located in aquifers. Characterizations above adequately describe the <br />nature and occurrence of the water. No further drilling is necessary to characterize the <br />water associated with the perched water in the existing holes. <br />Oakridge does expect to drill two additional drill holes as a part of the mine <br />development and coal evaluation for marketing. Accordingly, as the holes aze drilled <br />any water enwuntered in the drilling will be tested for quantity and quality. If the <br />holes are situated such that they can be left open for some length of time, longer term <br />testing will be likely restricted to the outcrop and subcrops of this zone. <br />• Groundwater monitoring data has been collected since the initial permitting of the <br />mine. All data collected has been initially reported in the 1995 Annual Hydrology <br />Report, submitted to CDMG. Groundwater (springs and wells) aze monitored for flow <br />and chemical composition in accordance with the monitoring program described in <br />Section 2.05 of this permit. <br />2.04.7(2) Surface Water Information <br />The watershed of Carbon Junction Canyon discharges to the Animas River which drains <br />the San Juan River Basin. The USGS has flow records on the Animas River dating to <br />1895. The nearest gage station is located approximately 3.8 miles upstream of the <br />confluence of Carbon Junction Canyon with the Animas River (Map 4-4). Mean <br />monthly discharge of the Animas River for the last 30 years of record is shown on <br />Figure 4-3. The flow rates represent discharge of 692 square miles of the San Juan <br />River Basin. The Colorado Department of Health collected water quality data on the <br />Animas River to classify the stream and set water quality control standards. The <br />Department of Health sampling station was located about one half mile north of the <br />USGS gage station (Map 4-4). A summary of Animas River water quality will be <br />found on Table 4-5. <br />• <br />Technical Revision 09 (v 1.0) 412 Revised 3/1998 <br />