The Middle Delta Prime Road (MDPR) Site is a former U.S. Department of Energy (DOE) property which is currently owned by Los Alamos County (LAC). The site encompasses former Material Disposal Area B which was the first disposal site for the Manhattan Project. Los Alamos National Laboratory (LANL) used the site in the mid-1940s for chemical and radiological waste. The site was believed to have been remediated and ownership had been turned over to LAC. In February 2020 while LAC was excavating to install utilities, a localized area of buried radiologically contaminated debris and soil identified as being from LANL operations dating back to the 1940s was unearthed. Since initial discovery, additional buried debris has been identified in other locations. The extent of contamination is currently unknown and may include hazardous and radiological waste. BGI is conducting site characterization in accordance with Compliance Order on Consent (Consent Order) between DOE and the New Mexico Environment Department (NMED) under the Resource Conservation and Recovery Act (RCRA). The overall arching project goal is to provide assurance to the DOE and LAC that the land is suitable for any use.
BGI has been tasked to implement a phased approach to site characterization and to evaluate if the site should be a Solid Waste Management Unit (SWMU). BGI utilized geophysical surveying to detect subsurface anomalies that might be indicative of buried debris and is now conducting sampling via potholing and excavation to determine the nature and extent of contamination. Following field activities, BGI will document the project activities, data analysis, human health and ecological risk assessment, and recommendation in a SWMU Assessment Report for submittal and acceptance by N3B, DOE, and NMED.