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NHDOT NH 113 Bridge 150/106 Replacement

 

DuBois & King provided design, environmental, cultural resource services, and assistance in public engagement for replacement of the bridge carrying NH Route 113 over the Bear Camp River in the Town of Tamworth. The bridge constructed in 1955, is a 3-span bridge with a total length of 123 ft. The center span is steel girders and a concrete deck, while the end spans are concrete slabs. Professional services include:

Geotechnical evaluation
Preliminary/final design for bridge replacement
Hydraulic study
Roadway approach design
Traffic control
Load rating

NHDOT NH 155 Planning and Design

 

Design services for reconstruction of approximately 2,500 ft of the structurally deficient NH Route 155 (Knox Marsh Road) roadway across a main line bridge over the Boston & Maine Railroad in Madbury. The project involved approximately 0.7 miles of NH 155, the relocation of one-quarter-mile of Pudding Hill Road, and the rehabilitation of portions of Pudding Hill Road.

Services included improvement study, conceptual alternatives, preliminary engineering and data collection, design, site review, construction traffic/access maintenance plan, construction phasing, cost estimates, and final design of all roadway work. Work involved preparation of preliminary, right-of-way, slope and drain, and traffic control plans; erosion control measures; relocation of a 24-inch water main; and removal of an existing and construction of a new bridge over the Boston & Maine Railroad.

Design issues included clearance over the railroad track, the close proximity of Pudding Hill Road/NH 155 intersection, driveway access in close proximity to the bridge, a major drainage culvert at the bridge, impacts to cultural and historical resources, and maintenance of traffic during construction.

Newport State Airport

 

Newport State Airport is a public use aviation facility generating approximately 7,140 operations per year (approximately 550 local general aviation operations, 1,460 transient general aviation operations, and 180 military operations). Two runways, Runway 18-36 and Runway 5-23 (crosswind runway), are both asphalt surfaced runways, 4,000 ft by 100 ft. Airport landside facilities include small terminal building, automobile parking, and four hangars.

DuBois & King designed a 2.4-acre expansion of the paved apron area north of the terminal building to accommodate up to 23 aircraft tie-downs and access to new hanger buildings; new connector taxiway B1 between the new tie-down area and existing taxiway B; and new stormwater management system to address treatment and control of stormwater runoff from the new impervious surface areas including future hanger building. D&K engineers provided permitting assistance for State stormwater discharge permit and for Act 250. Services included:

Runway reconstruction
Tie-down apron design
Master plan update
Permitting
Construction phase services

New Hampshire Bureau of Public Works Statewide Mechanical Engineering Services

 

Three multi-year retainer contracts providing services to the Bureau of Public Works to address mechanical, electrical, and associated structural engineering issues for HVAC at State facilities. Select projects include:

Concord Prison Mechanical Modifications, Special Housing Unit, Concord. Designed reconfiguration of the HVAC ventilation system serving the Special Housing Unit (SHU) in the prison. Reconfigured ventilation system ductwork serving the inmate cells, making access to the plumbing system clean-outs easier. Replaced two gas-fired boilers with three new high efficiency condensing boilers.

Heating Plant Renovations at Peterson and Dube Buildings, Lakes Region Facility, Laconia. Design for replacement of two gas-fired boilers with three new high efficiency condensing boilers, utilizing existing mechanical rooms. Added new digital boiler controls and fully modulating boiler gas burners to optimize the energy efficiency of standalone heating plant in both buildings.

Health and Human Services Building Chiller Upgrades, Concord. Design for replacement of a central 200-ton chiller, a 25-ton chiller, replacement of a 200HP high pressure steam boiler, and improvements to two air handling units. Assessed energy recovery methods, control sequencing, and occupancy usage.

Data Center Upgrades, Traffic Management Center, Concord. Designed HVAC for a new computer room including back-up A/C and upgrades and power enhancements for the primary data center that serves the State’s Traffic Management Center and 9-1-1 facility. Sized system for expansion of server equipment (air conditioning, power, and emergency services). The new A/C system utilizes a glycol cooling loop through an exterior dry cooler to provide “free cooling.”

Glencliff Assisted Living Facility, Glencliff. Design and survey services for this off-grid facility, including an emergency generator for a wood chip plant and above ground and below ground diesel fuel storage tanks.

New Hampshire State House. Design of HVAC upgrades to the State House’s central kitchen and dining facility, including new air conditioning equipment, kitchen hood make-up air, and exhaust equipment. Replaced two packaged air conditioning units and upgraded the kitchen ventilation system.

Improvements to Traffic Buildings, New Hampshire Department of Transportation. MEP assessment at Traffic Building A. Designed gas-fired radiant tube heating upgrades to Traffic Garage Building B. Designed gas-fired heating upgrades to Traffic Garage Building C.

NH Veterans Home Equipment Upgrades, Tilton. Upgrades included a new patient wandering system, replacement of all water source heat pumps including temperature control upgrades, a new commercial kitchen, and expansion of an existing domestic solar hot water system.

Cooling Tower and Roof Replacement, Rockingham County Courthouse, Brentwood. Design and cost estimating for replacement of cooling towers and roofs on an existing courthouse.

New Hampshire Army National Guard Training Site Environmental Assessment

 

The New Hampshire Army National Guard (NHARNG), in order to support its mission and provide a fully trained and ready force, prepared a site development plan to analyze how to best meet training objectives at the Center Strafford, New Hampshire, training site. The need for the Proposed Action, which included improvements and the development of expanded facilities, is based on the current facilities and limited land available at the training site.

As a task order from a multi-year retainer contract to provide professional civil/site engineering, development, environmental permitting, and planning services for the NHARNG, D&K engineers prepared a NEPA document, Environmental Assessment (EA) for the Proposed Action at the Center Strafford NHARNG Training Site. The EA provided a full comparative analysis of two possible alternatives: the Preferred Alternative – a full implementation of the site development plan for the training site and the No Action Alternative.

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