The owner of trash centers in Farmingdale and Lindenhurst that load garbage onto rail cars wants the state to let both expand, the company's CEO said Thursday.

Coastal Distribution LLC in Farmingdale, which now handles demolition and construction debris, has asked for a one-year trial to add up to 200 tons a day of baled and bagged municipal garbage in sealed rail cars, said William Gay, chief executive of its Jericho-based parent, Tunnel Hill Partners.

In Lindenhurst, One World Recycling wants a permanent permit for 650 tons per day of commercial waste, and construction and demolition debris.

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After superstorm Sandy, the state granted the trash center emergency authorization to handle 1,100 tons per day, up from 370. Getting the 650-ton permit requires Lindenhurst approval of a new building -- but village officials and residents have objected to the permanent expansion.

The public comment period for the two companies' permits will run from June 22 to July 10.

Licensed haulers pick up trash from various locations and deliver it to the centers.

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Both companies reduce the need for trucks that jam highways, the state's industry regulator, the Department of Environmental Conservation said. Last year, a scarcity of trucks caused trash to pile up on the East End, but that has not recurred so far, said DEC spokesman Thomas Mailey.

The Farmingdale site's expansion would try three ways of sealing the rail cars -- a synthetic mesh tarp, a flexible lid and a spray-on coating -- to trap odors and keep out scavengers, from birds to mice, the DEC said.

Gay said the trial will begin slowly to ensure residents have no complaints, and the DEC and railroad do not shut it down.

"There is no upside for me or this company to rush through a test," he said.

One World Recycling still hopes to persuade Lindenhurst to approve its new building. If the town rejects the proposal, the permit would be limited to 500 tons per day.

Gay declined to reveal negotiation details.

"I'm always willing and ready to talk," he said.

Gerard Glass, Lindenhurst's attorney, said the village supported the new building because enclosing its operations will reduce noise and dust.

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However, the town wishes to reduce the daily trips and operating hours, modify the type of waste, and bar nighttime deliveries.

"Thus far, the village has been unwilling to approve that substantial an increase" in capacity, he said.