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Sutton Road Bridge Replacement

 

DuBois & King was retained by the Town of Newbury to conduct an engineering study and final design for two bridges: Village Road over Andrew Brook and Sutton Road over Ring Brook. D&K suggested that a single study be developed to include both bridges, in order to save time, effort, and expense.

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 included field survey; 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 butted box beam superstructure on cast-in-place abutments and wing walls was recommended as the most cost effective replacement for the Sutton Road Bridge. Due to site constraints, a temporary one-lane bridge and bypass road was erected downstream to maintain traffic through the site during construction.

DuBois & King provided bid and construction phase administration and resident engineering services during construction.

Sucker Brook Channel Stabilization and Natural Channel Design

 

In the mid 1980s, a high flow event re-routed Sucker Brook out of its channel, away from a 25-ft waterfall, through an abandoned sand and gravel pit and traversed exposed sand, silts, and clays. Over the next twenty years, the channel steadily eroded with distinct headcuts progressing upstream. Approximately 72,000 cubic yards of material were transported downstream, leaving a steep, unstable channel at the bottom of a 40-ft gully. Vermont River Management called the Sucker Brook Tributary the worst channel avulsion in the State.

Project objectives were to reduce sediment loading from the reach, minimize construction and maintenance costs, and restore aquatic and riparian habitat. Regulators from the Vermont River Management Program and the US Army Corps of Engineers were kept informed of design considerations.

An evaluation matrix compared alternatives in terms of reduction in sediment loading, long-term stability, construction and maintenance costs, in-stream and riparian habitat, and impact to adjacent landowners. Presentation of alternatives at public meetings facilitated input and the concurrence of stakeholders and adjacent landowners.

Final design included a step-pool reach with eight stone weirs and a detailed planting plan to restore the riparian zone. A two-year construction sequence was developed that recognized limited construction funding and included volunteer labor to accomplish the planting program.

Substation Design Services

 

For the Vermont Electric Cooperative and Green Mountain Power, D&K provided civil/site and structural design services for the construction of three new substations in Jay and Lowell as part of the Kingdom Community Wind Project, a 63 MW capacity project powering 24,000 households. Two projects were total replacements of existing substations and one was a design of a completely new substation.

The projects included civil/site design of the substation yards and development of below grade packages to support equipment and control buildings. Services included development of geotechnical criteria for foundation design, technical specifications, and construction documents, and performing an independent technical evaluation of the below grade package. Construction phase services included bid phase assistance, review of contractor submittals and field testing reports, and construction observation.

Substation 45 Design Services

 

For the Vermont Electric Cooperative, DuBois & King provided civil/site and structural design for construction of a new substation in Derby. The new station upgraded the facility to current equipment and yard criteria. The site required design of a retaining wall structure. Services included providing independent technical structural evaluation of the below grade package, as well as bid phase assistance for a retaining wall.

Stark Covered Bridge

 

DuBois & King was selected by the Town of Stark to provide professional engineering services to conduct investigations, make recommendations for repairs/rehabilitation, prepare cost estimates, and assist with the preparation of a National Historic Covered Bridge Preservation Program grant. The bridge is a 134-ft-long, two-span structure constructed in 1857 that spans over the Upper Ammonoosuc River. The bridge is 29.5 ft wide overall, with enclosed sidewalks on the upstream and downstream sides. The bridge was constructed with Paddleford trusses spaced 18 ft apart for a one lane bridge. Recommendations included:

Repair leaking wood shake roof
Install additional roof rafters to support snow load
Repair checking and splits in timber truss members (10 locations)
Replace decayed and/or broken truss verticals
Install missing thrust blocks and spacer blocks at truss panel points
Remove rack, sag (deflection), and out of plumb trusses
Replace worn and rutted deck planks
Replace decayed timber deck stringers and sidewalk stringers
Repair portal siding (clapboards) and bridge siding
Reconstruct concrete bridge seat at abutments and pier
Repair/repoint north and south abutments stone masonry

Completed a report to include the above recommendations. Prepared grant application. Town submitted grant application and was awarded a grant for $904,000.

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