Woodlands of Millsboro Sewer Extension

GMB was contracted first by the Homeowners Association and later by Sussex County to provide Engineering Services for the extension of Sussex County Sewer Service to the Woodlands of Millsboro, a 57-lot residential subdivision located along Route 24 west of the Town of Millsboro, Delaware. 

This project was critically needed to replace the failing community Onsite Wastewater Treatment and Disposal System (OWTDS). The OWTDS received effluent from 30 community septic tanks, and comprised of a 4,400 gallon flow equalization tank, a 6,000 gallon Sequencing Batch Reactor (SBR), and a 4,400 gallon dosing tank.  Treated wastewater from the dosing tank was sent to pressure dose beds for final disposal.   Problems have persisted throughout the life of the OWTDS, such as ponding of water on surface of beds, overflowing of dosing tank, and electrical problems with the community Pump Station.

A Preliminary Engineering Report (PER) was prepared in accordance with USDA guidelines. Numerous alternatives were considered and cost estimates developed. The best solution was determined to be abandonment of the OWTDS  and construction of a pumping station and force main to connect to the Millsboro municipal sewer system.  A sewer district was created under the concept that Sewer Collection & Transmission would be provided by Sussex County with Wastewater Treatment & Disposal to be provided by the Town of Millsboro, under agreement between the Town and Sussex County.  Sewer Collection is provided by an existing collection system, which was upgraded to meet minimum County requirements. Wastewater Transmission was provided by a new Pump Station and Force Main, connecting to the Town of Millsboro sewer system.  The existing Lift Station and On-site Wastewater Treatment and Disposal System (OWTDS) were abandoned in accordance with DNREC requirements.

Construction was completed in March 2011, and consisted of approximately 94 Linear Feet (LF) of gravity sewer, 8,551 LF of force main, and one pump station.  This project was constructed for $457,858 using funding provided through a combination of USDA grant and State Revolving Loan.