The Route 203 site is located near the intersection of Route 203 and Sweets Crossing Road in Nassau, New York. The New York State Department of Environmental Conservation indicated that the property may have been used historically for waste oil handling and disposal activities. The U.S. Environmental Protection Agency (EPA) performed an assessment of the property in October 2018 and subsequently collected samples from the property in December 2018. EPA received final sampling results in March 2019 indicating elevated levels of PCBs and volatile organic compounds in soil and pond sediment. As a result, EPA collected samples from the surrounding environment later in 2019. In March 2019, EPA collected samples from 26 groundwater wells in the vicinity of the property, including a Village of Nassau public supply well. The groundwater sampling results showed no detections above federal or state drinking water standards in any of the wells. EPA also conducted additional soil sampling in May 2019, which revealed detections of PCBs in soil at two adjacent properties. The data collected in 2019 confirmed that past releases of hazardous substances had occurred at the site. In March 2020, EPA entered into an Administrative Settlement Agreement and Order on Consent with General Electric Company to perform additional Removal Action investigation activities at the site to define the nature and extent of contamination.