D&K provided mechanical, electrical, structural, landscape architecture, and civil design and retro-commissioning services for modifications of nine state facilities, converting from district steam to various types of local heating systems. D&K designed a new steam boiler plant—located remotely from the buildings it served—for the New Hampshire State House and two other State buildings. The project…
Located on the Otter Creek, the Huntington Falls Hydroelectric Project is a historic facility that required redevelopment. The D&K team assessed the two non-operational turbines and related appurtenances, the trash rack, and raker upgrades to the Unit 3 turbine following FERC relicensing. Additional D&K services included design and coordination to upgrade all three turbines, resulting…
The Neshobe River crosses through the heart of downtown Brandon, and the historic stone masonry bridge carrying Central Street/US 7 and numerous utilities had a history of substantially inadequate hydraulic capacity. As a demonstration of this issue, the town opened the front and rear doors of the adjacent town offices during a large storm event…
The transmission line owner required updated condition information on the foundation and structural support members of 165 high-tension lattice electrical transmission towers. D&K’s structural engineers visited each tower along the entire length of the project, often in remote locations with challenging terrain and access. We used a cloud-based assessment system to allow office personnel to…
The 40-year-old wastewater treatment facility, originally designed for a 20-year service life, was past due for a total treatment process change and facility upgrade. The project objectives included: utilize a state-of-the-art treatment process, design capacity for nitrogen removal, consider operational efficiencies and long-term operating costs, address issues with the location in a floodplain, and develop…
The Harrison Lake National Fish Hatchery required rehabilitation of several aging kettles that controlled water level in ponds, movement of water between ponds, and pond draining. D&K completed a topographic survey of the site to identify the location and as-built elevations of each kettle and valve replacement. Our structural engineers reviewed the original kettle design…
To improve access to transit and housing, the One Taylor Street project included the design of a new four-story transit center. Sited on a highly constrained, urban brownfield site, the building supports public bus operations, a visitor’s center, traveler services, bike lockers, and apartments. D&K’s design included three bus parking bays, a 23-car parking area,…
Used for aircraft access from the tarmac, the existing seven hangar doors were original to the facility (circa 2003), no longer operated efficiently, had tears in the door fabric assemblies, and were troublesome to repair, as the manufacturer was located in Finland. The doors were 33 ft high and ranged in width from 60 ft…
The Perkins Cove Seawall consists of a 650-ft-long timber wall constructed in 1950, later supplemented with Class VII stone blocks placed in front of the timbers (seaside). A 30-ft section of the seawall failed as a result of an ocean storm. The town sought FEMA assistance to make emergency repairs. D&K’s civil, structural, and geotechnical…