Partnering with Trout Unlimited |
With the intent to ultimately treat the AMD issues in the park, ACPF utilized resources from Trout Unlimited’s (TU) AMD Technical Assistance Program. AMD impacts were first evaluated in fall 2014 under low flow conditions. ACPF then requested that TU provide an assessment of AMD impacts via a monthly flow monitoring program for one year from spring 2015 to spring 2016 and a single high flow assessment in spring 2015. Monthly flow sampling was being conducted at nine discharges throughout the park by the Allegheny County Conservation District (ACCD) with assistance from TU’s contractor, Hedin Environmental (HE).
Most of the discharges originate from an old Pittsburgh Coal strip mine bench that ribbons through the watershed. All AMD sources identified and sampled in fall 2014 were re-sampled in spring 2015.
Through this study we were able to determine that while many small flows of water in the Pinkertons Run watershed are polluted by inputs of AMD, these flows are readily neutralized by naturally occurring alkaline strata that occur downgradient of the coal seam. During both low and high flow conditions, most of the AMD is neutralized and the tributaries have pH 6-8 and net alkalinity at their inflow to Pinkertons Run, with two exceptions, Tribs 4 and 13, which are now the highest priority projects for eventual remediation.