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exceeded Colorado State drinking water standards. Manganese, as well as bicazbonate, calcium and <br />magnesium, were also elevated above concentrations in Harvey Gap. The increased cation and anion <br />levels reflect prolonged contact of the seepage water with the Mancos Shale formation underlying Grass <br />Valley Reservoir. Thete was no change between fall and spring samples. <br />• No water sampling data has been found for the ephemeral drainages of the permit area and adjacent <br />areas. It is assumed that the water quality would be different that the perennial watersheds due to their <br />differing runoff characteristics. <br />Hydrology -Monitoring Program. The ground water of the permit area is monitored at the following <br />sites (See Map HGP - 18; Regional Geology and Hydrology Map): <br />Water dischazging from the mine. Presently there is no water being discharged from the mine. <br />Water seepage from under Harvey Gap dam. <br />Water discharged, if any discharges occur, will be monitored quarterly for estimated flow and field <br />parameters. One sample will be taken yearly of water discharged from them mine and analyzed for the <br />parameters listed in Table 9: Full Suite of Chemical Pazameters and Field Parameters. Water seepage <br />from under Harvey Gap dam s monitored annually for estimated flow, water temperature, pH and <br />specific conductance. <br />The surface water of the permit azea is monitored at the following sites (See Map HGP - 18: Regional <br />Geology and Hydrology Map): <br />Harvey Gap reservoir outflow above the mine. <br />Harvey Gap reservoir outflow below the mine <br />Sediment pond outflows. <br />The estimated flow, water temperature, pH, and specific conductance are measured monthly. Semi- <br />annual (high and low flow) water samples are taken from each sample site and analyzed for the <br />parameters on Table 9: Full Suite of Chemical Parameters and Field Parameters, An armuai hydrology <br />report will be submitted to the Division after completion the calendar year, by the end of the following <br />February. <br />One year after completion of grading of the surface area if there are not any significant deviations of <br />water quality, Eastside Coal may request division approval to change monitoring requirements as <br />follows. Ground and surface water will be monitored on a semiannual basis for estimated flow, <br />temperature, conductivity and pH. A sample will be obtained on an annual basis and analyzed for the <br />parameters listed in Table 9: Full Suite of Chemical Parameters. Sediment pond outflows will be <br />monitored and sampled as required by the current NPDES Permit. <br />Renewal #3 02/08!2000 59 <br />