Services: Civil | Categories: Landfills | Location: Long Island

Town of Brookhaven Landfill Cell 6 Phase XIII

Brookhaven, New York

Town of Brookhaven

Contract Value:
$9.6 Million

Project Dates:
March 2022 - January 2023


• Cut and Fill Landfill Cell expansion
• Materials used were sand, bentonite, soil, and geocomposite clay
• Isolation trench liner testing
• Leachate collection pipe installation
• Landfill gas system modification
• Temporary stormwater pump station setup
• Shed and ham radio tower relocation
• Rip rap channel installation
• Installation of grass lined perimeter and landscaping


For this Landfill Expansion project, materials such as sand, bentonite, soil, soil drainage layers, along with geocomposite clay and geosynthetic liners had to be imported and installed at the Town of Brookhaven’s landfill. Posillico’s scope also included, primary leachate collection pipe installation, landfill gas system modification, temporary stormwater pump system set up, and shed and ham radio antenna relocation. Following the mixing/placement of bentonite fill material, installation of liner and sand drainage layer placement, an isolation trench was excavated for liner leak testing. The isolation trench was backfilled upon completion of leak testing. This was followed by a NYC DEC ALR testing duration of 30-days. Afterwards, the team installed a rip rap channel, as well as a grass lined perimeter, and finally landscaped the surrounding area.


An extremely stringent gradation specification resulted in delays in approval of drainage layer sand. Additionally, bentonite had to be transported by train from Wyoming during the period of major transportation delays due to Covid.


Multiple sources were used to procure the 13,000 CY of drainage layer sand for the project. The Bentonite deliveries by rail had to be coordinated with Posillico Materials East to arrive on the site when needed. Posillico constantly followed up with vendors as well as trucking and freight companies to make sure materials arrived on site when needed to avoid impacts to the Critical Path Method.