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+ i i i <br />. y <br />`' • <br />RED CANYON t•1ItJE TEST PANEL <br />HYDROLOGIC MONITORItJG <br />I <br />Grand Mesa Coal Company has proposed that a panel of the Red Canyon 1 <br />Mine (Panel 7 North) be designated as a test panel to evaluata the effects of <br />higher coal recovery in the E Seam. This panel was selected because it represents <br />an area of acceptable risk if subsidence were to occur. <br />From a hydrologic standpoint, the panel is located approximately midv+ay <br />between 4Jard Creek and 4Jilliams Creek in an area v+ith both valley terrain and <br />higher terrain. Froin available aerial photography, it would appear that so_m~- <br />e <br />_minor irrigation ditches may exist in the southern part of thA a ~~ + ' <br />major Pratt Ditch to the south) The depth to v+ater in alluvial materials over- <br />. <br />laying the a <br />It is recommended that the following hydrologic monitoring activities be <br />undertaken in association with mining of the test panel: <br />1. Flow measurements of all irrigation ditches overlaying and adjacent to <br />Panel 7 tJortli. (Daily or v+eekly monitoring measur-ements should be <br />taken upstream and downstream of the test panel.) <br />2. Installation of 2-3 piezometer-s (1-inch) to identify and measure <br />water levels in the glacial-alluvial aquifer overlying Panel 7 North <br />(Note: May require continuous recorders). <br />3. In-mine measurements of v+ater inflow to the mine in the area of specific <br />inflov+s (if possible) and measurement of collective flov+ in the nor-t'n <br />(do:+n dip) area of Panel 7 North. <br />