TECHNICAL REPORTS Robert Hedin, Corresponding Author bhedin@hedinenv.com orcid.org/0000-0001-9220-4518 Hedin Environmental, 195 Castle Shannon Blvd., Pittsburgh, PA, 15228 USA Correspondence Robert Hedin, Hedin Environmental, 195 Castle Shannon Blvd, Pittsburgh, PA 15228, USA. Email: bhedin@hedinenv.com Search for more papers by this author Benjamin Hedin, Dep. of Geology & Environmental Science, Univ. of Pittsburgh, Pittsburgh, PA, 15260 USA Search for more papers by this author John T.