Rehoboth’s approved wastewater projects include a pump station, a force main and an ocean outfall.
The City of Rehoboth Beach celebrated the completion of the Ocean Outfall project with a ribbon-cutting ceremony on Friday, June 15, 2018. The $52.5 million project (cost-shared with Sussex County) will ensure the city's treated wastewater meets the present and future needs of the City of Rehoboth Beach and nearby communities that rely on Rehoboth for wastewater treatment and disposal, as well as the environmental goals of the State of Delaware.
The City was required, under the terms of the consent order from DNREC, to eliminate discharge of treated effluent from the Rehoboth Beach Wastewater Treatment Plant into the Lewes-Rehoboth Canal. The city, after detailed studies and evaluation of all options, pursued an ocean outfall in order to comply with that order.
As of May 23, 2018, the plant has been pumping treated effluent through the ocean outfall redirecting discharge from the Lewes-Rehoboth Canal.
Below is background information on the years-long project and related documents.
Permits and plans: On May 25, 2017, Delaware Department of Natural Resources and Environmental Control (DNREC) Secretary Shawn M. Garvin approved and signed the Secretary’s Order for the Rehoboth Beach ocean outfall which includes all required DNREC permits to move forward with construction. The U.S. Army Corps of Engineers will be issuing a permit along with a Sediment and Stormwater Permit from the Sussex Conservation District, and DelDOT permits for work on state road right-of-ways.
The approved pipeline alignment begins at the existing Rehoboth Beach Wastewater Treatment Plant, follows the Lewes and Rehoboth Canal north to Grove Park. The pipeline then turns northeast to Henlopen Avenue and continues along Henlopen Avenue to the Deauville Beach parking area and terminates in the Atlantic Ocean, approximately 6,000 feet from the parking area. The 24-inch high-density polyethylene (HDPE) pipeline was installed via horizontal direction drill approximately 3,000 feet and marine open-cut trench approximately 3,000 feet. Once the pipe was anchored in place with concrete collars, the open-cut trench was backfilled. The terminus of the outfall pipe consists of a 120 linear foot diffuser comprised of eight risers, 1.5 feet above the ocean floor, with four discharge ports per riser. The diffuser was installed on pilings to ensure stability.
Want a quick overview? The Center for Inland Bays has produced a brief fact sheet, https://www.inlandbays.org/wp-content/documents/CIB_Rehoboth_Beach_Ocean_Outfall_Fact_Sheet_FINAL.pdf
Resources: Rehoboth’s permit applications and supporting documents, and a fact sheet and a draft NPDES permit are available on DNREC’s website http://www.dnrec.delaware.gov/Admin/Pages/Rehoboth-Wastewater-Projects-Info.aspx.
Documentation dating back to 2005, with a full history of the project can also be found on the City’s website: https://cityofrehoboth.civicweb.net/filepro/documents/7006