Nevada Div. of Environmental Protection, Bureau of Industrial Site Cleanup (BISC), 178 pp, 2018

This monitoring and performance report for the perchlorate treatment system at Henderson, Nevada, documents groundwater monitoring and fluidized bed reactor (FBR) remediation system data collected July 1 through December 31, 2017, as well as results of the annual monitoring well sampling event. Groundwater treatment system operation is based at a 9,000 ft² building located within a 1.77-acre site in Henderson. The FBR system began operation in late September 2012 and is designed to remove perchlorate from groundwater extracted from the Valley Auto Mall area (near the source area close to the former PEPCON facility) as well as the shallow groundwater bearing zone before it enters the Las Vegas Wash. The treatment system comprises 14 extraction wells, a water handling and FBR treatment plant, and a discharge system. The FBR plant consists of two first-stage FBRs that contain sand while a second-stage FBR contains granular activated carbon. Microorganisms growing as a film on the media utilize metabolic pathways to reduce perchlorate, chlorate, nitrate, and oxygen in redox reactions that result in nitrogen, CO₂, water, and minerals. Ethanol is added as an electron donor along with nutrients (di-ammonium phosphate/urea mixture) and other trace elements. The pH is adjusted through the addition of a 50% (by weight) solution of sodium hydroxide. https://ndep.nv.gov/uploads/env-sitecleanup-active-bmi-ampac/endeavour-2h2017-report.pdf