Groundwater monitoring was conducted semi-annually during the system expansions conducted in 2020 and 2021 and the semi-annual monitoring was extended through 2022. Since 2023, groundwater monitoring is conducted annually, and the next sampling event is scheduled for October 2025.
| City | Rock Hill |
|---|---|
| County | York County |
| State | South Carolina |
| Coordinates | 34.85167, -80.90417 |
Leonard Chemical Co Inc is a federal Superfund site in South Carolina. The Superfund program, created by Congress in 1980, addresses sites where hazardous substances have been released or threaten release into the environment. EPA scores potential sites using the Hazard Ranking System; those that score high enough are placed on the National Priorities List.
Current status: Remedy selected. EPA has selected a cleanup remedy but construction has not yet begun. The remedy selection process involves a feasibility study, public comment period, and a Record of Decision documenting the chosen approach.
EPA has identified 10 contaminants of concern at this site, including 1,1,2-trichloroethane, 1,2-dichloroethane, 1,2-dichloroethene (cis and trans mixture). Contamination has been detected in groundwater, soil.
If you live near this site and have health concerns, your state health department can provide site-specific guidance. EPA maintains a community involvement program for most NPL sites, and site documents — including the Record of Decision, five-year reviews, and public health assessments — are typically available through EPA's Superfund site profile.