Tuesday 3:50 Bradley R. Shultz, Skelly and Loy, Inc.
Acid Rock Drainage Sludge Management Issues at the I-99 Construction Site in State College, Pa
Bradley R. Shultz
Over 900,000 cubic yards of pyritic material was unearthed during excavation work for constructing Interstate 99 near State College, Pennsylvania. The pyritic material was placed in fill disposal areas on-site, some layered with lime material. Upon determination of acidic discharges from the oxidation of pyritic material in the fill disposal areas, active treatment was employed using a caustic soda product to neutralize the acidic discharges. The existing settling basins originally designed for erosion and sediment control were used to provide detention of the chemically treated acidic discharges and settle out the precipitated metals. To prevent discharge of the solid materials and maximize retention time, periodic sludge removal from the basins is necessary. Geotextile tubes, pumps, polymer, a 2,500-gallon vacuum truck, and hard working individuals were used for handling and processing the sludge material from several of the basins in 2004. Estimates indicate over 2,000 cubic yards of sludge are produced monthly in the settling basins on the site. Processing of the sludge and allowing the material to dewater within the geotextile tube, yields a high solids cake-like material suitable for hauling and disposal. This methodology for processing sludge created during the treatment of acidic discharges, either rock or mine sources, has proven effective for handling high volumes of sludge material in preparation for hauling and disposal. With a year of working experience, this same method of sludge handling has been employed again at the I-99 project site in 2005.
Bradley R. Shultz is a Water Quality Scientist for Skelly and Loy,
Inc. located in Harrisburg, Pennsylvania. He earned his Bachelor
of Science degree from Millersville University in Marine/Aquatic
Biology and his Masters Degree from Penn State University in Environmental
Pollution Control. At Skelly and Loy Mr. Shultz has performed numerous
tasks related to both acid rock and acid mine drainage issues throughout
the state. In addition to passive and active treatment system design,
Mr. Shultz has performed numerous field investigations to evaluate
treatment system effectiveness and problem shooting through water
chemistry investigations. Currently, Mr. Shultz is helping to oversee
and perform the sludge handling and processing operations at the
I-99 Construction Site immediately west of State College, PA, where
iron and aluminum sludge is generated from the active treatment of
acid rock drainage on the site.