D&K served as Chief Inspector for reclaiming and repaving 7.2 miles of VT Route 66. Services included engineering design and plan development, roadway banking improvements, pavement markings, signage, pedestrian ramps, guardrail improvements, truncated domes, rehabilitation of drainage structures, and cost/quantity estimation. As Chief Inspector, D&K oversaw the work of one state employee and another consultant inspector. Provided coordination with adjacent landowners to resolve issues of drainage and driveway access.
Mill Road Bridge and Retaining Wall
Engineering, permitting, and construction-related services for design-build bridge and retaining wall project. Bridge is an 83 ft long, single span, steel beam bridge with a concrete deck supported by concrete abutments. Steel beams were cleaned/painted. High performance concrete deck replacement, elimination of curbs, and new abutment backwalls and railings significantly extend the service life of the structure. New deck designed to support AASHTO HL-93 live loads and bridge improvements designed in accordance with VTrans bridge design criteria. Designed of new 110 ft by 15 ft tall cast-in-place concrete retaining wall supporting a portion of Mill Road roadway approach. Design for reconstruction of 300-ft of roadway approach.
Ryegate Design-Build Culvert Replacement
D&K is the lead engineer for the $15.2 million dollar VTrans Ryegate STP CULV (10) design-build project, which replaces a deteriorated culvert conveying the Manchester Brook under US Route 5 and the Washington County Railroad. The existing undersized culvert has contributed to flooding of US Route 5 and the backwater jeopardizes the integrity of the roadway and rail embankments. The existing culvert is a deeply buried structure (over 60 ft under the railroad embankment) with steep embankments on both sides of the roadway and rail line. Partnering with the contractor, D&K has developed a solution that provides savings in initial construction costs, safer conditions for future inspections, better access for maintenance, improved aquatic habitat, and improved service life and constructability.
The structure consists of two 32-ft-wide, cast-in-place, reinforced concrete arch culverts beneath the roadway and rail line. The culverts are 141 ft and 128 ft in length and will have a 100-year service life, eliminate flooding potential, and greatly improve aquatic organism passage. The project includes a temporary rail bridge to allow culvert excavation below, and temporary track realignment and superelevation removal to minimize lateral forces of trains on bridge throughout construction. Complex design issues include designing a culvert to meet better than a 100-year service life; design of support for temporary roadway and rail bridges; design for significant slope stability issues; protection of the brook throughout construction; and limiting settlement between footings to 1 inch or less.
Gilead and Wright Road Bridges
Tropical Storm Irene destroyed Bridges #35 and #37, isolating residences on Wright Road and Gilead Brook Road from all other Town and State highways. D&K evaluated replacement alternatives; made recommendations for replacement options; conducted hydrologic and hydraulic analyses; coordinated with utilities; and provided survey, permitting, engineering design, contract plans, cost estimates, bid phase services, and observation during construction for both bridge replacements. The Town received Public Assistance funding from FEMA to replace the bridges. D&K recommended the Town replace Bridge #35 with a new 31.5 ft span, precast concrete rigid frame supported on cast-in-place abutments, and that the Town replace Bridge #37 with a new 37 ft span, precast concrete rigid frame supported on cast-in-place abutments. Because the replacement structures were larger than and dissimilar to the former structures, D&K advocated on behalf of the Town to have FEMA approve the upgrade. D&K assisted the Town during the bid and construction phases to solicit and review bids, review shop drawings, and conduct routine field observation of construction to ensure the bridges were constructed in accordance with the design documents.
Eastman East Lake Road Drainage
The Eastman Community Association (ECA) selected DuBois & King to assess existing conditions (including stormwater patterns, drainage infrastructure, erosion areas, roadway conditions and subsurface conditions) to evaluate stormwater quality, erosion and roadway improvements to mitigate water quality impact to Eastman Lake. Located within the sub-association of the Eastlake Condominium Association (ELCA), DuBois & King collaborated with both stakeholders on developing improvement alternatives. The engineering study discussed roadway surface, stormwater collection and stormwater treatment options enhance water quality discharging to the lake. An engineering study recommending the preferred alternative, project phasing and anticipated construction costs has been approved by the ECA and ELCA project committee. A Public Hearing is scheduled to receive public feedback that will ultimately lead to the design/development phase of the project.
Construction of the recommended improvements are scheduled to be completed Summer 2017. DuBois & King staff are providing hydraulic and hydrologic (H&H) analysis, drainage system design, geotechnical engineering, wetland delineation, survey, and permitting assistance to advance the project from study phase to design phase and though construction.