Wastewater Ocean Outfall

The City of Rehoboth Beach is required, under the terms of a consent order from the Dept. of Natural Resources, to eliminate the discharge of treated effluent from the Rehoboth Beach Wastewater Treatment Plant into the Lewes-Rehoboth Canal. The city, after detailed studies and the evaluation of all options, is proposing an ocean outfall in order to comply with that order.

This project consists of a new pump station and a 24 inch force main/pipe which are required to convey the treated effluent to the ocean outfall and to provide the head required to pump the effluent through diffusers located 6,000 feet offshore in water approximately 40 feet deep. Vertical turbine effluent pumps will be installed in the existing post-aeration tank. The force main will be aligned along the plant access road and end at the public access parking area at the beach near Henlopen Avenue.

The pipeline from the Rehoboth Beach Wastewater Treatment Plant to the ocean outfall was sized to handle the summer peak flow. As part of the overall project analysis, a detailed alignment study was completed to determine the best routing of the force main considering such issues as cost, environmental issues, permitting, potential interferences, traffic control and public concerns. The preferred alignment was selected based on the recommendations of the Rehoboth Beach Wastewater Treatment Plant Effluent Force Main Alignment Study.

Project Update

On August 14, 2017, the Rehoboth Beach Commissioners unanimously approved awarding four bid packages to various contractors to begin construction on the ocean outfall project. The project consists of a new pump station and 24-inch force main, which are required to convey the treated effluent to the ocean outfall and to provide the head required to pump the effluent through diffusers located 6,000 feet offshore in water approximately 40 feet deep. The bids totaled $37,381,407. The ocean outfall bid was awarded to Manson Construction of Seattle, Washington, for $27,655,850. Allan Myers Construction of Worcester, Pennsylvania, was awarded the effluent pumping station bid for $1,768,555, and the wastewater treatment plant upgrades for $2,256,555. A-Del Construction of Newark, Delaware, won the force main bid for $5,700,447.

Contractors were pre-qualified by GHD, the engineering company for the project. Steps taken to pre-qualify were assessing each contractor's project completion record, reviewing their performance on similar projects, safety record, insurance coverage and other factors. Mobilization of equipment is scheduled for October 1, 2017, and work is to be completed by April 30, 2018.

On August 7, 2017, the Rehoboth Beach Commissioners unanimously approved a renewed and expanded PDF icon Agreement for Wastewater & Biosolids Services with Sussex County. Sussex County Council unanimously approved the Agreement for Wastewater & Biosolids Services at their meeting on August 8, 2017. Under the new agreement, the county will continue to pay the city to treat wastewater from surrounding areas of the county's sewer system. The county will be responsible for hauling via truck the city's biosolids to a new treatment plant at the county's Inland Bays facility. Fees will be determined once the new facility is operational, and the city will not have to contribute to operating costs until that time. Sussex County's contribution toward the $52.5 million outfall project will be based on utilization of services.

Construction work at the Wastewater Treatment Plant on the first bid package (T-1 Immediate Needs 1) will be wrapping up this summer. The work included demolishing remains of the existing steel roof on T-1, installing a new precast concrete roof deck, with concrete beams and columns for support, mobilizing a temporary roofing system while a new plank is fabricated, installing a new roofing membrane and skylights. 

New skylight at the WWTP

We are in the shop drawing submittal phase of T-1 Immediate Needs II. As soon as things get final approval, they will begin to work on this portion. The work includes installing new lighting and electrical conduit on the upper level, installing new HVAC (fans and unit heaters) on the upper level, installing new exterior fiberglass doors and frames on the upper level and installing a new roof access ladder. 

Stormwater Sampling Project

Between now and September, the City of Rehoboth Beach will be conducting stormwater sampling near Lake Gerar and along the boardwalk. Nine water quality sampler units are installed next to manholes in these areas. DNREC mandated the city to submit a report on the water quality in five stormwater outfalls that empty into the ocean as part of the approval of the Rehoboth ocean outfall permits. The outfalls are located at Grenoble Place, Maryland Avenue, Rehoboth Avenue, Laurel Street and Delaware Avenue. The purpose of this sampling is to investigate what is in the city's stormwater. This information will be used to check the water quality, and where needed, develop options to reduce stormwater volume and evaluate disposal options along with improving the water quality. 

During a storm, the tubing will pull a sample of the stormwater at specific times. It is important that these units and their tubing are not unplugged, moved or disturbed to assure that accurate data is collected. If you see a sampler and it looks like someone has tampered with it, please contact the Rehoboth Beach Police Department at 302-227-2577 so that the sampler can be checked to assure that it is in proper working order. During, or just after a storm, you will see GHD employees on-site collecting the samples. Their safety vests will be clearly marked GHD. If you see anyone that appears to be working on the samplers that are not in GHD safety vests, please contact the number above. Thank you for doing your part to protect the water quality at our beach. If you have any questions about the sampling process, please contact GHD Engineer Jeff Riling at 240-206-6838 or via email at [email protected].

Wate quality sampler unit

Announcement of Rehoboth Beach issuance of outfall permitting

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 will then turn northeast to Henlopen Avenue and continue along Henlopen Avenue to the Deauville Beach parking area and terminate in the Atlantic Ocean, approximately 6,000 feet from the parking area. The 24-inch high-density polyethylene (HDPE) pipeline will be installed via horizontal direction drill approximately 3,000 feet and marine open-cut trench approximately 3,000 feet. Once the pipe is anchored in place with concrete collars, the open-cut trench will be backfilled. The terminus of the outfall pipe will consist 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 will be installed on pilings to ensure stability.

Mobilization of equipment will begin in October 2017 with an anticipated construction completion in April 2018.

The Secretary's Order can be viewed at http://www.dnrec.delaware.gov/Info/Pages/SecOrders_Permits.aspx

Approved Permits

Bid Information

DNREC Workshop & Hearing

DNREC Public Workshop October 19, 2016
DNREC Public Hearing November 15, 2016

Frequently Asked Questions

FAQs regarding the Wastewater-Implementation of Ocean Outfall Alternative Discharge

Funding

Resources

 

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