Specifications include, but are not limited to: The Masteller Site consists of two non-contiguous areas (Permit Areas S-125-82 and S- 10-85) mined during the late eighties and early nineties. The former permit area discharges substantial loadings of acid mine drainage (AMD) constituents, and likely represents the more challenging area to remediate due to rugged topography, distances between seeps, extremely elevated concentrations of hot acidity and dissolved iron in several of the seeps, and the absence of a source of alternating current power within a reasonable distance. The latter permit area contains a single pond which receives relatively minor seepage of a quality and flow regime that appears to be suitable for passive treatment. Permit Area S-125-82 consists of a ridge top in the North Branch of the Potomac River Basin. Most AMD sources are located on the western side of this ridge and, after passing through onsite Ponds 2 and 3, drain through steep terrain to an unnamed tributary of the North Branch. On the eastern side of the ridge, a single AMD source flows to onsite Pond 1. Technically, this pond lies within the Piney Swamp Run Subbasin, a North Branch tributary that flows in a northerly direction and enters the river just upstream of Hampshire, WV. However, Pond 1 does not appear to discharge under normal hydrometeorologic events, and appears to function more or less as an infiltration/evaporation basin.
