The 40-year-old Northfield Wastewater Treatment Facility (WWTF) required a comprehensive upgrade of the facility and process conversion from Trickling Filter (TF) to Sequencing Batch Reactor (SBR) to comply with stringent phosphorous limitations. The site was constrained by the railroad and the Dog River, requiring geotechnical measures to protect rails. D&K conducted all professional engineering services…
During the surge of Tropical Storm Irene, flows at the town’s wastewater treatment facility decreased by 60%. It was determined that a double-barrel sewer siphon, consisting of an inlet and outlet structure, was destroyed by the storm when the Third Branch of the White River migrated 90 feet to the northeast. D&K provided design and…
Three small municipalities had to find a solution to maintain Lake Fairlee, a regional recreational resource with numerous lakefront properties that make up a substantial component of these towns’ grand lists. The logistics and politics of rehabilitating the Lake Fairlee Dam were complex: the dam is privately owned, and the dam’s concrete auxiliary spillway, which…
Under a multi-year contract and an expedited schedule, DuBois & King provided guidance on planning, technical, environmental, and regulatory issues. Projects under this contract included a Capital Improvement Plan update, technical master plan update, runway extension, hangar area development, terminal apron expansion, Environmental Assessment, construction of a full parallel taxiway, snow removal equipment acquisition, a…
To address the evolving needs of US service members, the VA is committed to maintaining and renovating its facilities and campuses. For over a decade, D&K’s civil, structural, mechanical, and electrical engineers and other professionals have served in a lead role in renovating VA medical centers, developing campus-wide energy efficiency projects, and leading the design…
To expand on-campus housing, NU needed a new 286-bed, five-story, 75,000-SF student housing facility. The project delivery method was unconventional, as the owner acted as the Construction Manager. D&K provided a range of services, including structural engineering. Structural systems consist of precast hollow core planks supported by structural steel beams and columns to facilitate low…
When the Brattleboro School required expansion and renovation, D&K provided electrical and mechanical design to implement energy improvements for this 336,000-SF facility serving grades 6–12. Efficiency upgrades included daylighting controls; occupancy sensors; heat recovery system; high-efficiency air conditioning system; wood chip boiler as the primary heat source; CO2 sensors; VFDs on select air handling heat…
The Gray Farm needed a new waste storage facility and leachate collection system. D&K visited the site and conducted field survey and mapping, soil investigations, preliminary engineering, final design, and construction phase services while following the requirements of the NRCS EQIP program.
The City of Laconia’s Parks and Recreation Department sought to create a new infill park on Lucerne Avenue. The park included a restroom building, an amphitheater, a playground, and a pavilion. D&K worked with subconsultants to accomplish Low Impact Development practices and provided part-time construction observation services, concrete foundation testing observation, and contract administration services.