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Traffic Circulation and Streetscape Study

 

A traffic circulation and streetscape study of the Libbytown area, a section of the City of Portland located between the Portland Transportation Center and downtown. Libbytown is currently divided by I-295, reducing the area’s value and function as a neighborhood. The study considered a variety of options to improve connectivity including reconfiguring or redesigning ramps, converting one-way streets to two-way traffic, evaluating traffic circulation improvement options, enhancing the pedestrian and bicycle network, and developing streetscape planning to improve livability and a sense of neighborhood.

Public and stakeholder engagement was an important component of this project. The project team was successful in communicating technical transportation issues to the public and building an understanding of project issues among the residents and stakeholders and in developing a consensus for the preferred alternative.

Town Engineer, Chester

 

Served as town engineer for Chester, New Hampshire, since 1987. Services have included design for infrastructure improvement projects: dams, culverts, bridges, roadways, etc. For Chester’s Planning Board, D&K engineers review subdivision and site plans for new developments submitted to the Town’s planning board. The engineering review is to assure that new development roadways, stormwater drainage and collection, erosion control, and sewerage disposal systems conform to Town and State regulations. Services include construction observation for development projects. D&K has reviewed and inspected over 50 projects for the Town, including:

Red Fox Lane (Review). 9 lot open space subdivision with 925 ft of roadway (25 acres).

Jenkins Farm (Review and Inspection). 62 lot open space subdivision with 5,200 lf of roadway (219 acres).

Pipit Estates (Review and Inspection). 7 unit open space subdivision with 675 lf of roadway (25 acres).

Pondview Meadows (Review and Inspection). 10 unit open space subdivision with 1,600 lf of roadway (47 acres).

Crowley Subdivision (Review). 2 lot subdivision (4.8 acres).

Sirois Subdivision (Review). 2 lot subdivision (27 acres).

Towle Subdivision (Review). 3 lot subdivision (13.5 acres).

Fritsch Subdivision (Review). 3 lot subdivision (18.6 acres).

Hazelton Subdivision (Review). 2 lot subdivision (10 acres).

Misco Subdivision (Review). 2 lot subdivision (54 acres).

Hadik Subdivision (Review). 2 lot subdivision (6 acres).

Alta’s Way (Review and Inspection). 10 lot open space subdivision with 750 lf of roadway (28 acres).

Abdallah Subdivision. 4 lot subdivision (21 acres).

Emerson Road (Review). 4 lot open space subdivision with 350 lf of roadway (24.8 acres).

Crowley Woods (Review). 53 lot subdivision with 11,855 lf of roadway (187 acres).

Town Engineer, Barrington

 

Professional services to assist the Town of Barrington, New Hampshire, with engineering and support to the Town’s planning board with review of development site plans/subdivisions, and construction observations services for development projects. Engineering and review projects have included:

Roadway Conditions Assessment. Town-wide assessment of roadway pavement conditions. Services included assessment of existing conditions, prioritization of recommended improvements, and development of a budget for the Town’s future road maintenance. The Town has approximately 67 miles of paved and 13 miles of unpaved roads.

Route 125 and Route 9 Intersection Traffic Analysis. Traffic analysis of impacts from a convenience store/gas station development proposed for an already congested, busy intersection in the center of Town.

60-lot Open Space Development Traffic Analysis. Review of traffic impacts from a proposed 60-lot open space development on abutting intersections and local roads along Route 125.

Village Place (Subdivision). Review of 64-lot open space subdivision with 5,300 lf of roadway.

TurboCam (Subdivision). Review of 6-lot mixed use (light industrial/municipal) 30-acre subdivision with 1,000 lf of roadway.

TurboCam (Site Plan). Review of 93,000-sf light industrial building with 215 parking spaces.

Midpoint Properties (Site Plan). Review of 10,400-sf addition to light manufacturing building including 40 parking spaces.

Tropic Star Convenience (Site Plan). Review of 5,000-sf convenience store with 10 fueling stations and 33 parking spaces.

Glass Lane Office Building (Site Plan). Review of 2,655-sf office building with 28 parking spaces.

Village Plaza (Site Plan). Review of 2,492-sf restaurant with 25 parking spaces.

Fisheye (Subdivision). Review of 12-lot, 46-acre subdivision with extensive wetlands and streams.

Associated Buyers (Site Plan). Review of 20,000 sf building addition with associated parking.

Yellow Dog Barn (Site Plan). Review of 10,000 sf building expansion and associated site, parking, and drainage.

Towle Road Bridge Replacement

 

Alternatives analysis, design, and construction phase services for the replacement of a failing bridge that consisted of two 5-ft diameter steel culverts. D&K performed ground surveys, base map preparation, subsurface investigations, and a preliminary hydraulic analysis to size the new structure to pass the 50-year storm event. Alternatives considered included several suitable bridge types including a new precast concrete arch structure, a precast voided slab deck, and a cast-in-place concrete deck slab. The evaluations considered geometric, hydraulic, and structural requirements; detailed construction cost comparisons; roadway improvements; and environmental impacts and permitting requirements.

DuBois & King engineers proceeded to provide engineering services for a 20-ft span, precast concrete arch and prepared Preliminary Plans indicating engineering details of the new bridge and roadway with an updated construction cost estimate. Preliminary design work included preparation and submission of permits to the New Hampshire Department of Environmental Services. Bid and construction phase administration and engineering services were provided for the project. The project was developed in accordance with the NHDOT Municipally Managed Program bridge design procedures.

Three Rivers Transportation Pathway

 

Engineering and construction phase services for a new 1.1 mile shared use transportation path connecting Western Avenue with a new trailhead at South Main Street. The path is 10-ft-wide with 2-ft-wide graded shoulders and includes: several roadway crossings; redecking of a 160-ft-long former railroad bridge over the Sleepers River; design of special planking for a former 250-ft-long railroad tunnel for snowmobile, bicycle, and pedestrian use; landscaping and use of retaining walls to address property owner concerns; sections of sidewalk for pedestrians; and a “share the road” section for bicyclists. Design included a new trailhead parking lot and lighting in the tunnel and at the bridge over the Sleepers River.

Services included alternatives analyses, design, right-of-way, environmental documentation, utility coordination, contract document preparation, and assistance during construction. Preliminary Plans were prepared by others and had been approved when D&K was assigned the project. D&K modified the path alignment and design to eliminate a rail crossing and to minimize wetland, stream buffer, cultural resource, and property impacts. The project required extensive coordination with adjacent residential and commercial property owners. Project included extensive coordination with the VTrans Rail Section. D&K also met with the Vermont Railway and conducted a diagnostic meeting to discuss crossing of their active line.

Project issues included working with the VTrans Rail Section for property boundary establishment and leasing of the Lamoille Valley rail corridor; conversion of the former rail bridge and tunnel to shared use path facilities; extensive property owner coordination, negotiation, and mitigation measures to address concerns; and coordination with Vermont Association of Snow Travelers (VAST) for future extension of this path to become part of the Lamoille Valley Rail Trail. The project was administered through VTrans Local Transportation Facilities (LTF) Section and followed the LTF Guidebook for Municipally Managed Projects.

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