Annapolis DPW

Allen + Shariff provided MEP/FP/IT engineering design services for this $10.4M new multi-building project. The Greenfield Development is a new 30,000 SF Public Works campus. The main building has two-story administrative offices with connected automotive service center; a second building for fleet maintenance, and a third building as a salt barn with material bins. The project was awarded USGBC LEED Silver Certification – August 2023.

The mechanical system for the office portion has variable refrigerant flow air handling units, as a mixture of ceiling cassettes and wall mounted units. Outside air is ducted to each space from a dedicated outside air system roof top unit with preconditioning. Separate exhaust systems were provided for vehicle tailpipe exhaust, maintenance storage rooms, tire room, fluids, and secure storage. The vehicle repair portion of the main building has infrared tube heaters. The fleet maintenance building has a heated portion with gas fired unit heaters; and both portions have general ventilation. All garage areas have gas detection systems for carbon monoxide and nitrogen dioxide, interlocked with ventilation / exhaust systems and alarms.

The plumbing and fire protection design for the project comprised two of the three buildings: the admin/maintenance building and the garage. Both buildings were protected throughout with a wet/dry sprinkler system that was fed from the local municipality. The storage characteristics of the admin/maintenance building were considered when authoring the sprinkler performance specification that considered the supplied street pressure and losses expected in the system. The domestic plumbing system for the admin/maintenance building features an ultra-efficient condensing water heater with re-circulation loop. Further design includes oil/grit interceptor for the maintenance floor and compressed air and lube systems.

The vehicle maintenance facilities have been rated Class 1 Division 2 hazardous location per the NEC. The entire facility is served from a 1200A, 208Y/120V switchboard that serves Building 1 and Building 2. A 300kw Generator and automatic switch was provided to serve emergency power to the whole facility in case of a power outage. LED lighting and extensive lighting controls is provided throughout the facility including high bay lighting the vehicle service bays that meet LED requirements for controllability of systems. LED site lighting was provided in conjunction with utility provided lighting to meet LEED requirements for reduction in light pollution.