Description: The purpose of this project was to construct a passive treatment system on the "School Trib" (Trib #4) in the Deer Creek watershed approximately 3 miles southwest of Frenchville on Route 879. The length of Trib #4 is impacted by numerous AMD seeps from past deep mining activities. Rather than tackle each discharge individually, we chose to construct this treatment system in a downstream area where the flow from all these separate discharges has combined and can be treated together at one location. The treatment layout consists of a mixing basin, vertical flow pond 1, settling basin 1, vertical flow pond 2, and final settling basin with final discharge through a riprap lined spillway and back into the Unnamed Tributary to Deer Creek. In addition to the AMD Passive Treatment System this project also included a Step-Pool type treatment system for existing impacted stormwater drainage that crosses the site but could not be directed into the main system due to elevation differences. The Step-Pool system is constructed at the east end of the AMD treatment system. This system offers some treatment to the impacted run-off waters that flow through the site into the Unnamed Tributary to Deer Creek. Treatment within the Step-Pool includes limestone, organic media, and aeration.