In-Water Concrete Use

Poured concrete will be excluded from contact with surface or groundwater during initial curing, ideally for 30 days after it is poured. During that time, runoff from the concrete will not be allowed to enter surface or groundwater. If this is not feasible due to expected flows and site conditions, commercial sealants that are appropriate for use near water may be applied before the sealant comes into contact with flowing water. If sealant is used, water will be excluded from the site until the sealant is dry and fully cured, according to the manufacturer’s specifications. Concrete is considered to be cured when water poured over the surface of concrete consistently has a pH of less than 8.5. More information regarding excluding water from a site is provided in Section, Dewatering Activities and Aquatic Species Relocation.