Using deep row biosolids application to grow hybrid poplar trees on sand and gravel mine spoils is a unique and innovative beneficial-use technique that solves many of the conventional problems. Research since 2001indicates there are no indications of nitrate leaching and the tree plantation systems are performing well. Given the large acreage of mine spoils in the metro area, deep row application has the potential to utilize significant amounts of biosolids produced in the Washington, D.C. region.