Modification of the Grit and Scum Building- WDF constructed a 17,000-square-foot addition to the Owls Head Grit and Scum Building for the NYC DEP. This building houses new waste water treatment processing equipment. The addition consisted of a four story concrete structure with Steel H Pile foundation, masonry walls, limestone and brick cladding, a large skylight, membrane roof, six high speed rolling doors, two story windows, hydraulic elevator, new mechanical equipment, and controls room office space. The interior finishes consisted of painted masonry walls, resinous flooring, stainless steel gratings, guardrails, glazed block walls, and acoustical ceiling tile for office spaces.