Site 44FX1999 is located within the Upper Potomac Regional Park, in Great Falls, Fairfax County, Virginia. The Potomac Interceptor is a 50-mile-long gravity sewer system operated by the District of Columbia Water and Sewer Authority (DC Water). The PILTOA project involves the construction of odor abatement structures at vents along the route of the sewer system. One of the proposed odor abatement structure locations falls within the Upper Potomac Regional Park. In accordance with the right-of-way permit for a Special Exemption Area, Fairfax County CRMPS requested an assessment of the effects of the planned construction on the previously-recorded archaeological site 44FX1999.