dhahn@hahn-eng.com
+845.279.2220
Westchester County Soil & Water Conservation Village of Irvington Reservoir Valve Restoration
Westchester Municipal Planning Federation Croton Landing Park and Riverwalk Trail Croton-on-Hudson
Westchester Municipal Planning Federation Route 120 Pedestrian Path Town of New Castle
James J. Hahn, P.E. New York State Society of Professional Engineers Westchester/Putnam
Westchester Water Works Conference Town of Bedford Bedford Consolidated Water District #1 Filtration Plant
ASCE Lower Hudson Valley Branch Dobbs Ferry Waterfront