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Water from the well in Bond Creek has not shown TDS levels elevated much beyond their historic values, neaz 5000 mg/1. When Seneca Coal Company can demonstrate that the reclaimed lands meet the phase II bond release criteria, the sediment ponds, excepting the Wadge., Pond 003, and PeCoCo Impoundments, which are approved permanent impoundments, will be removed from the site. At that time, it is assumed that the majority of baseflow to Cow Camp, Bond and Grassy Creeks will be contributed by spoil aquifer discharges to the surface system. In the Grassy Creek Drainage, the quantity and quality of the flows will be similaz to present conditions. All of the spoil spring discharges issuing into the Grassy Creek drainage will pass through the Wadge Impoundment, a permanent structure. Dilution and mixing within the impoundment will diminish the concentration of dissolved solids discharged to the alluvial system. As mining continues in this drainage, some increase in dissolved constituents is expected. Data collected at NPDES sites 002 and 003, which discharge disturbed area drainage into Grassy Creek, indicate that there has been m increase in TDS, based on monthly average concentration (June through September) on a yearly basis for the years 1982 through 1996. It should be noted, however, that the rate of increase, based on monthly average TDS concentration on a yeazly basis, appeazs to have stabilized during this period. Therefore, it is not expected that the quality of the effluent will further degrade the alluvial water quality in the Grassy Creek Drainage. In the Cow Camp and Bond Creek drainages, Wadge spoils aquifer discharges will contribute flow to these tributary creeks and eventually to Fish Creek. During the months of June and July, Cow Camp Creek and Bond Creek sustain flow their entire length to Fish Creek. During this period, each creek contributes water to the associated alluvial aquifers. The spoils spring discharges aze sufficiently diluted by snowmelt runoff to preclude degradation to the quality of the alluvial aquifers in these drainages. (See the Surface Water section of this Probable Hydrologic Consequences statement for further discussion regarding surface water impacts.) Information supplied by Seneca Coal Company indicates that at their confluences with Fish Creek, Cow Camp Creek and Bond Creek do not support flow during the months of August and September. It is assumed that during this period of time, Cow Camp and Bond Creek flow for at~~ut 2 miles beyond the disturbed azea boundary before becoming ephemeral. At the point where the streams become ephemeral, it is assumed, for purposes of this discussion, that the flow in each drainage is 0.2 cfs with a TDS concentration of 2500 mg/1. 33