The Brookhaven Town Board has awarded a $10 million contract to a Port Jefferson construction company to expand a section of the town landfill, which stores construction and demolition debris and ash from a Hempstead incinerator.

Town officials said last year that the 40-year-old landfill, in Brookhaven hamlet, is expected to close in about 10 years. Gibson & Cushman will build phases nine and 10 of a project to add space in the landfill’s cell 6, which officials have said they expect to be one of the last sections built before the dump closes.

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The board unanimously awarded the contract to Gibson & Cushman Contracting on Thursday. Town officials said the firm’s bid was the lowest of six submitted for the project.

In addition to the construction contract, the town board also unanimously awarded a $142,500 contract to Moretrench American Corp. of Rockaway, New Jersey, to build gas extraction wells for cells 5 and 6 in the landfill. Moretrench American submitted the only bid for the work, officials said.