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<br />Additional Notes on Groundwater <br />The Grasse Creek Mine area contains no appreciable groundwater above <br />the double ledge sandstone (See page II.D-4) which is about 150' below <br />the Blacksmith coal seam. All drill logs available show groundwater to <br />be virtually non-existant. Water from the well drilled for dust control <br />water comes from the sandstones below the Blacksmith seam. The rocks im- <br />mediately above, between and immediately below the coal are shales and <br />shaly sandstones which are relatively tight and impermeable and lack the <br />porosity necessary to be considered aquifers. The good sandstone aquifers <br />in the Iles Formation are not exposed in the permit area nor will they be <br />encountered during mining. <br />There is a saturated zone of alluvial water in direct hydrologic con- <br />tact with Grassy Creek. Its width is the valley bottom (50' to 150') and <br />• its depth is from 15' to 30'. The material in this saturated zone is sedi- <br />mentary rock pebbles and valley fill clay and silt. The three wells (moni- <br />tor wells 1 through 3) rise and fall with stream flow, high levels during <br />runoff and low levels when Grassy Creek is dry. Because of the lack of <br />groundwater to test there are no "groundwater" analyses. This report does, <br />however, include analyses of the••water from the Monitor wells located in the <br />alluvium alongside and under Grassy Creek. <br /> <br />8-81 II.E-3 <br />