Pinyon completed a Comprehensive Environmental Response, Compensation, and Liability Act Preliminary Assessment for the National Park Service at the Frijoles Canyon Visitor Center maintenance area in Bandelier National Monument, New Mexico. The primary objective of the Preliminary Assessment was to evaluate legacy dichloro-diphenyl-trichloroethane impacts associated with historic pesticide storage, mixing, equipment cleaning, and application. Pinyon reviewed prior investigations and regulatory information, completed a site visit and historical interviews, and evaluated the site’s geology, hydrogeology and potential exposure pathways. The assessment confirmed that dichloro-diphenyl-trichloroethane releases had occurred to soil and surface water near the maintenance yard and Frijoles Creek; prior investigations estimated approximately 405 cubic yards of soil exceeded human-health risk-based screening levels. Pinyon’s updated screening also identified multiple soil samples exceeding current National Park Service ecological screening values and United States Environmental Protection Agency residential screening levels, providing the National Park Service with a basis for evaluating the potential need for additional investigation or removal action.
