Case Study: Using Immunoassay Technology and a Dynamic Work Plan to Cost Effectively Achieve Site Cleanup and Statistical Certainty in Closure

The Tree Fruit Research and Extension Center (WTFREC), located in Wenatchee, Washington, includes a former U.S. Public Health Service/EPA pesticide test plot area and a laboratory drain field, in addition to an active university tree fruit research and extension center. As a result of pesticide weathering experiments the test plot had been contaminated with organochlorine, organophosphorus, and other pesticides above known levels of concern for human health and the environment. The US Environmental Protection Agency (EPA), Washington State University (the current property owner), and Washington Department of Ecology determined that remediation of the test plot area was necessary. The EPA requested the U.S. Army Corps of Engineers, Seattle District (USACE), to propose, design, and implement the characterization and remediation.