Graces Quarters, a restricted area on the Gunpowder River and Dundee Creek — adjacent to the Hammerman Area of Gunpowder Falls State Park — was a testing area for chemical warfare agents and decontaminants in the 1950s and 1960s.

Carroll Island to the south was an open-air test site for blistering, nerve and other chemical agents. The aquifer is not a drinking-water source for any off-post communities, researchers and regulators say, and U.S. Geological Survey tests show that the water flows away from private wells farther inland.

But the highest levels of the solvent are 7,000 times as high as what the Environmental Protection Agency and the Maryland Department of the Environment say are acceptable.

The meeting is scheduled for 6:30 p.m. Tuesday at Marshy Point Nature Center in Chase.