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Probable XydrolaRic Cansepuencet -Chimney Rock Mine <br />Creek as 100,000 gallons per day per foot (g/d/h). Transmissivity and storativity of the Fruitland <br />Formation was estimated from a pump test performed on wells MW-9 and MW-10 in the Barren <br />Ridge area. Transmissivity of the formation was estimated at 130 g/d/ft and storativity was <br />estimated at 1.3 x 10~ (Piteau and Associates, 1982). Relationships of the above units are detailed <br />in Figures 2,3,4,5 and six. <br />Water quality in these areas was determined from water samples obtained from wells installed for <br />baseline and ongoing monitoring purposes. Four wells each were previously installed in the <br />Fruitland Formation and the alluvium. An additional well was installed in the spoil. Water <br />_ ~ samples obtained from wells located in the Fruitland Formation are a mixed ion calcium- <br />- sulfate/bicarbonate type. Water samples obtained from wells completed in the alluvium are <br />' generally consistent with the parameters found in the water samples from Stollsteimer Creek. The <br />t water is a mixed ion calcium/magnesium-sulfate/bicarbonate type. <br />PROBABLE HYDROLOGIC CONSEQUENCES <br />The site is an inactive former open pit coal mine. Surface reclamation of the site has been <br />completed and the pits backfilled. Data from water samples obtained from the wells and surface <br />water stations within and outside of the permit area have indicated little effect on the waters in the <br />area. Data from the wells and surface sampling stations is reported in the Annual Hydrologic <br />' Reports. Future impacts could be related to the infiltration of surface and groundwaters into the <br />backfilled pit areas. Since the areas have been disturbed, the transmissivity of these areas is <br />anticipated to be higher than the surrounding areas. <br />' ALLUVIAL AQUIFER AND SURFACE WATER IMPACTS <br />' The aquifer associated with Stollsteimer Creek, has a high transmissivity and is unconfined. <br />Possible impacts to this aquifer would be associated with the infiltration of lower quality water <br />' from the pit areas, effects from the dewatering conducted in the area, and water quality deviations <br />caused by surface infiltration of lower quality runoff water. <br />The preferential flowpath of materials from the filled pits would tend to be horizontal with <br />discharge into the alluvial material. This is indicated by the difference in the relative horizontal <br />to vertical permeability of the formation, the shales that exist between the pit areas and the <br />~ sandstone, and the distance to the discharge point in the alluvium. <br />Transmissivity of the formation was estimated by Piteau and Associates (1982) via pump testing. <br />I The transmissivity determined was approximately 210 g/day/ft. The hydraulic conductivity of the <br />formation can be determined from the transmissivity by the equation T = Kb, where T is <br />transmissivity, K is the hydraulic conductivity, and b is the aquifer thickness. Therefore: <br />Revised hydrologic-053105-22~0(1:26PM) 3 <br />