Iowa Department of Natural Resources, Document 32978, 878 pp, 2017

Historical remedial activities at this site have included tank removal, soil excavation, and two rounds of substrate injections to promote enhanced reductive dechlorination (ERD) and abiotic chemical reduction using emulsified vegetable oil (EVO) and zero-valent iron in the site's eastern and western areas of concern (AOCs). PCE, TCE, and daughter products cis-DCE and VC are the principal constituents of concern in site groundwater. In 2015, ERD implementation was selected to treat the downgradient portions of the plume while the remedy for the primary source areas was still under review. The initial phase of ERD treatment was implemented in downgradient portions of the western AOC in November 2015, followed by a second phase of ERD treatment in the eastern AOC in 2016 and a third phase in 2017 to expand the ERD treatment area in the western AOC. This report documents the remedial actions conducted at the site from September 2015 through December 2016 and summarizes the results of these actions. The widespread observation of both ethene and ethane within the CVOC plume in areas where ERD treatment was implemented demonstrates that complete degradation of these constituents is ongoing. Please be advised that the 878-page Document 32978 at https://programs.iowadnr.gov/contaminatedsites/Site/Documents/659 is slow to load.