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Village Road Bridge Replacement

 

DuBois & King was retained by the Town of Newbury to conduct an engineering study and the final design for two bridges: Village Road over Andrew Brook and Sutton Road over Ring Brook. For cost and time efficiency, D&K recommended a single study be developed to include both bridges.

Services included development of an engineering study to identify replacement structure options, recommendation of a preferred alternative, and identification of whether the new bridges should be constructed on different alignments to improve geometrics and facilitate the maintenance of traffic throughout construction. Services also include field surveys; geotechnical borings; cultural and natural resource investigations; permitting; and the development of preliminary and final design drawings, cost estimates, and bid documents.

A precast/prestressed concrete voided slab superstructure on cast-in-place concrete abutments and wing walls cast directly on ledge was proposed as the most cost-effective replacement for the Village Road Bridge. DuBois & King provided bid and construction phase administration and resident engineering services during construction.

Village Covered Bridge

 

The Village Covered Bridge, also known as the Big Eddy or Great Eddy Bridge, is a 105-ft-long, single span structure constructed in 1833. A cantilevered timber sidewalk was added on the downstream side in 1940. This bridge is Vermont’s second oldest covered bridge. The one-lane bridge spans the Mad River in downtown Waitsfield and utilizes a Queen Post and Burr Arch configuration, with trusses spaced 16-ft apart. The Village Covered Bridge is listed on the Historic National Register and the Vermont State Register of Historic Places.

Emergency Repairs – DuBois & King provided fast-track structural inspection, evaluation, and rehabilitative design for the bridge, which was damaged during Tropical Storm Irene. Damaged components include: timber siding, timber truss, timber diagonal member, north abutment backwall, north and south sidewalk approaches, and north roadway approach. The Village Covered Bridge is a vital transportation link for residents of the Town of Waitsfield. Closure of the bridge forced residents to use a 4.5 mile detour, thus making repairing the bridge a high priority for the Town.

Subsequent to the emergency repairs, DuBois & King was selected by the Town of Waitsfield to evaluate the current condition of the bridge, make recommendations for repairs, design repairs, and provide construction administration services.

The structure was showing signs of distress with noticeable sag at the outside edge of the cantilever sidewalk and negative camber in both trusses at the north end near the abutment. Noticeable spalling and deterioration of the north and south concrete abutments and wing walls was also evident.

DuBois & King completed extensive field observations and prepared a condition assessment report with recommendations and cost estimate for repairs. Recommended repairs included jacking and rehabilitating the main trusses; rebuilding and supporting the cantilever sidewalk as an independent structure; concrete repairs and patching on the abutments; and repairs and replacements to deteriorated or worn roof rafters, floor beams, and decking. Professional services include:

Inspection
Alternatives analysis
Public meetings
Historic review
Recommendation for short and long term repairs
Final design of recommended improvements
Bid phase services
Construction phase services

Veteran’s Reservoir Amphibian Habitat Mitigation Site

 

DuBois & King documented an amphibian habitat to be impacted by the Bennington Bypass construction and designed an amphibian habitat mitigation site to replace breeding habitat. The design involved the reconstruction of an abandoned water supply pond by reconstruction of the weir, grading to create optimum pool depths, provision of a fish barrier, plantings and placement of woody debris for egg attachment sites, and provision of boulders and woody debris for sunning sites. Provided construction monitoring and post construction monitoring, with documentation of breeding by wood frogs and ambystomids.

Rehabilitation services – Due to storm damage from Tropical Storm Irene, the Vermont Agency of Transportation needed to determine the extent of damage to the Veteran’s Reservoir amphibian mitigation site and options for rehabilitation. DuBois & King performed a study to determine the hydrology and rehabilitation options for the amphibian habitat mitigation site. The site consists of a former water supply impoundment, which was inundated and partially filled with sediment during the storm.

Study to determine the feasibility of remedial measures:

Dredging of accumulated sediment
Raising of the fish barrier without removing sediment
Dam removal
Separation of the impoundment from the stream

Professional services included:

Wetland delineation
Hydrology and hydraulics
Topographic survey
Field review of the existing stream channel
USACE and wetland permitting services

Vermont Technical College Hartness Library

 

DuBois & King provided engineering design services for renovation of the Hartness Library, which serves the students of the Community College of Vermont and Vermont Technical College. The facility was originally constructed in 1966 and since that time no major changes have been made to the building. The current facility is 12,000-sf and consists of student areas, offices, restrooms, storage, and mechanical areas.

Engineering services for improvements to modernize and reconfigure the building to provide a space more suitable for study and academic inquiry; creation of additional private and collaborative study areas; increased access to information technology and improved lighting; upgrades to office space and bathrooms; and upgrades to ADA accessibility to bring the library in line with modern standards.

Design for the electrical system upgrades to the 12,000 sf campus library included new energy efficient lighting, data/computer system wiring, cable management layout, and electrical power and distribution. System improvements included fire alarm and lighting controls. Design addressed occupancy comfort and efficiency of heating, electrical energy, and ventilation.

Vermont State House Chiller Upgrades

 

DuBois & King performed mechanical, structural, and electrical services for the design of a replacement chiller to provide year-round cooling capacity utilizing water-to-air cooling coils. New chiller senses 8 different air-handling units throughout the State House. Design included replacement of control valves on air handling units to provide variable speed pumping to save energy. Structural evaluation was performed to evaluate existing equipment framing and to ensure roof load carrying capacity was adequate.

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