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48 <br />the improved hydraulic connection are not clear. Constructing a compacted • <br />shale trench to prevent communication between pit backfill and the deposits <br />in Ennis Draw or restricting mining so that the deposits are not inter- <br />sected is recommended. - <br />B. Post-Mining Water Quantity and Quality <br />Ide believe that the sources of existing ground waters on the lease- <br />hold are located exterior to the site and will not be affected by the <br />mining operations. Further, the disturbance of the overburden should not <br />change the quantity of vertical recharge which is probably negligibly <br />small. Thus, the mining operations should not significantly alter the <br />existing quantities of water passing through the leasehold, once the <br />water levels have recovered. This statement is based upon the assumption <br />that a permanently improved hydraulic connection between waters in Ennis <br />Draw and the leasehold is avoided: <br />Based on a comparison of the EC of saturation extracts prepared <br />from composite samples of the overburden with that for existing overburden <br />waters, no further degradation of water quality is anticipated as ground <br />water passes through the spoils. Protection of water quality in the <br />stream deposits in Ennis Draw can be provided 6y a compacted shale trench <br />in areas where the pit cuts into these deposits, or by not permitting the <br />mining operations to intersect the deposits. ~ <br />1 <br />