On September 2, 2016, Plantation Pipe Line submitted a Corrective Action Plan (CAP) to the South Carolina Department of Health and Environmental Control. The CAP proposes the use of biosparging technology to clean up groundwater at the site, in addition to continued petroleum product removal, and perform routine monitoring of surface water and groundwater. Biosparging is one method of bioremediation commonly used to clean up underground petroleum contamination. It involves injecting air into the ground to promote breakdown of the petroleum products into gases (carbon dioxide) and water. Weekly recovery of product is on-going at the site and surface water samples are collected and analyzed monthly at multiple locations along Brown's Creek. It is likely that corrective action at the site will be necessary for up to ten years or longer. It is common and expected for a cleanup of this magnitude to take decades to reach closure. Monitoring and assessment will continue after remediation has been completed. The CAP was published for public comments between October 21, 2016 and December 6, 2016.
On February 24, 2017, Plantation Pipe Line submitted the “Startup Plan for Surface Water Protection Measures: Revision 2”, which describes the process for operating the groundwater cleanup system and monitoring the petroleum removal. The Startup Plan includes the operation of a biosparging system in the areas of Brown’s Creek and Cupboard Creek, and a stream aeration system in Brown’s Creek, as well as air, surface water, and groundwater monitoring in both areas. DHEC reviewed the “Startup Plan for Surface Water Protection Measures: Revision 2” and granted approval on March 1, 2017.
On March 7, 2017, Plantation Pipe Line notified DHEC that initial testing activities on the biosparging systems and aeration system began on March 6, 2017. The notification letter also indicated that the biosparging system in the areas of Brown’s Creek and Cupboard Creek and the stream aeration system in Brown’s Creek are planned to be fully operational by March 10, 2017.