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1 <br />' Monitor holes 36-2L and 35-4L both showed slight increases for the first three readings and then <br />a drop on the last reading. As noted previously, both of the locations are being approached by <br />mining activity and declines in the piezometer levels were anticipated as a result. <br />Monitor hole 4-20L showed a fluctuating water level with a generally declining trend. <br />' The response of "lower sandstone facies" monitoring holes 2-17L, 2-7L and TW2-7L to mining and <br />' leaking exploration holes indicates the area of influence in the "lower sandstone facies° is larger than <br />that in either the "upper sandstone facies" or the "siltstone-coal facies°. However, the response of <br />these monitoring holes to low flows of about 1 gpm in the leaking exploration holes further indicates <br />the low water flow characteristics of the "lower sandstone facies°. <br />' From the baseline data, all three zones should be classified as 'aquitards° in that they will yield <br />water but at very slow rates. Mining in the D Seam so far has encountered only small flows of water <br />and the mine is essentially dry. Water leaking out of caved areas is routed to the sump at the end <br />of Sixth East. Anew borehole was drilled to this sump and the pump was removed from the old <br />borehole and installed in the new one. From there it is pumped to the surface through a borehole <br />and discharged. This borehole is designated as sump dewatering hole 2 or SDH-2. Anew sump <br />' and sump dewatering hole (SDH-3) will be used when mining begins in longwall panel 6 (see plate <br />1). <br />' 2.2.2.4 Bedrock Water Quality Water sampling and analysis are no longer required from the <br />bedrock monitoring holes. However, prior to entering Federal leases C-8424 and C-8425, one <br />' water quality sample will be collected and analyzed from each of the monitoring holes in those two <br />leases. <br />' The Deserado Mine First Annual Hydrology Report (December 1985) contains baseline water quality <br />data for the bedrock zones. <br />2.2.2.5 Mlne Water Balance Table 2-3 shows the water balance for the Deserado Mine. A <br />' description of how these numbers are arrived at follows. <br />1 <br />1 <br /> <br />11 <br /> <br />