Santee Cooper secures AquaDam as additional risk mitigation for Grainger ash ponds
MONCKS CORNER, S.C. – Santee Cooper has secured an inflatable AquaDam to assist in protecting the dike around Pond 2 at the former Grainger Generating Station, as the adjacent Waccamaw River continues to rise. The inflatable dam is arriving this evening and should be fully installed by later tomorrow.
Floodwater projections indicate a potential overtopping of the dikes could occur as early as this weekend.
Specifically, Santee Cooper has 6,000 linear feet of AquaDam, enough to cover the dike around Pond 2, where most of the ash still onsite remains. The AquaDam is being assembled next to the silt fencing along the pond dike. Once placed and inflated with water, the dam will add 30 inches to the top of the dike. The dam will be deployed in 100 foot sections, is 7 feet wide at the base for stability, and the sections are pumped full of river water at the site.
Pond 1 is too narrow to use the AquaDam product, and nearly all of the ash it once contained has been excavated. Santee Cooper has been excavating its Grainger ash ponds since 2014 and has removed close to 90 percent of the ash.