Twenty-two laboratory columns packed with flue gas desulfurization (FGD) wastes from tests of the Coolside Technology were constructed and are being monitored for leaching characteristics at the UK-CAER for approximately 8 months. FGD materials from the four pilot plant runs conducted by Consol in Library PA as well as two composite samples from demonstration-plant runs 1 and 3 conducted by Ohio Edison in the Edgewater Power Plant near Loraine Ohio were included in the investigation. Details of the packing procedure and test matrix have been described in a previous report. Variables investigated in the test matrix include solids packing density (49 and 65 lb/ft{sup 3}), contact with a variable CO{sub 2} atmosphere (0, 2.5, and 5 vol%), the rate and method of water addition (fixed-47 and 94 mL/wk; rain simulation), and prehydration (0, 15, 30, and 45 wt% prehydration water-dry basis).

The objective of this project is to produce sufficient information on the physical and chemical nature of Coolside wastes to design and construct physically stable and environmentally safe landfills. The report consists of three monthly progress reports which detail investigations of geotechnical properties and mineralogic reactions of Coolside fly ash, ash, and FGD sludges. Both laboratory and field lysimeters have been set up to gather leachates for testing. Results are presented on the laboratory leachates; field lysimeters have just begun to flow.