Downtown and Business District

Wyandanch, NY

H2M prepared bid documents for the construction of a new wastewater pumping station with an average daily design wastewater flow of 380,000 GPD.

The Town of Babylon is committed to the development of a viable downtown and business district in the hamlet of Wyandanch. A significant obstacle to redevelopment is the lack of a central sewer collection system for disposal of wastewater. The Wyandanch Commercial and Industrial Corridor planning area is located in Groundwater Management Zones I and VII. Suffolk County Sanitary Code Article 6 limits the discharge of wastewater through conventional on-site sanitary systems in these zones to 600 gallons per day, per acre. On-site sanitary systems contribute to the degradation of groundwater quality of Long Island’s sole source groundwater supply. The goal was to determine if a cost-effective, environmentally accepted alternative existed to aid its revitalization and to improve environmental conditions.

We prepared bid documents for the construction of a new wastewater pumping station with an average daily design wastewater flow of 380,000 GPD on a 60’ x 100’ parcel, providing four construction contracts for the pump station. Plans and specifications for the 5,300 foot long, 10-inch diameter force main were incorporated.

The wet well was provided with two chambers. One chamber comprised of two submersible pumps, while the other had one submersible pump and the base elbow and guiderail to allow installation of an additional future pump. A precast concrete building was utilized to house the standby generator, chemical feed and vapor phase odor control systems, motor control centers and natural gas fired standby generator. Architectural finishes were designed in coordination with the Town to blend with nearby homes. A permeable reinforced concrete grid paver was included to reduce the amount of runoff. The design also included a magnetic flow meter, gantry system for removal of pumps, a valve chamber, surge relief valve and landscaping. The Control Building was located at the front of the site as part of the method of screening. H2M also designed 1,465 linear feet of 20-inch diameter sewer at the downstream end of the collection system to connect to Suffolk County Sewer District No. 3. Approximately 1,000 linear feet passed through the Southern State Parkway right-of-way. Consequently, New York State required that the bid documents indicate the installation of 36 inch diameter jacked steel casings for the sewer pipe installation. The design included the location of the proposed jacking and receiving pits to install the five casing segments.