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WWTF Process Conversion, Upgrades, and Siphon Design

 

Process, civil, structural, mechanical and electrical design, permitting, and construction phase services for an $8.9 million comprehensive upgrade of the 40-year-old wastewater treatment facility that serves the Town of Randolph. D&K assembled a team of professionals including a local architect, geotechnical engineer, and energy management specialist. A new sequencing batch reactor (SBR) was designed to provide operational flexibility in the face of pending nutrient (including nitrogen) removal requirements in the Connecticut River drainage basin.

The project included new headworks, fine screen, grit removal, chlorine disinfection/dechlorination, aerated sludge storage, and centrifuge dewatering and a backup generator. Using a holistic and integrated design approach, opportunities were maximized to incorporate energy conservation and renewable energy features into the upgraded facility while minimizing ongoing operational and maintenance costs.

Included in the project is the Route 66 Siphon, which is a two-barrel siphon that conveys approximately 40% of the Town’s wastewater flow under Ayers Brook and to the wastewater treatment facility. The siphon is comprised of two (2) 8-inch HDPE siphon barrels, each approximately 1,800 feet in length, along with associated inlet and outlet structures, as well as cleanouts along the siphon. This siphon allows the Town to downsize the Route 66 Pump Station, as the siphon vastly reduces the flow handled by the Route 66 Pump Station.

Wason Pond Dam Reconstruction

 

The Town of Chester acquired Wason Pond to preserve the area for public recreational use. DuBois & King conducted an engineering evaluation to assess the condition of the dam and identify short-term repairs and long-term improvements. The primary concerns with the dam was inadequate hydraulic capacity, structural stability, and seepage. This effort led to a full rehabilitation of the dam.

The dam is an earthen embankment with a concrete overflow spillway located near the left abutment. The dam is approximately 165 ft long and 15.5 ft high. Dry laid-up stonewalls form the downstream face of the spillway and adjacent walls. The spillway consisted of a concrete slab set on top of laid-up stones and had a clear width of approximately 18 ft at the upstream crest. Removable flashboards were located along the upstream edge of the spillway crest. The drainage area into the pond is approximately 1,633 acres (2.55 square miles).

The required capacity of the spillway was greater than what the site would accommodate. Due to the confines of the site, the spillway was designed as a two-cycle labyrinth weir to achieve the hydraulic capacity. The rehabilitation included concrete training walls, a seepage cut-off wall, and installation of a mineral toe drain filter for seepage control.

To meet schedule objectives, the project was developed to utilize winter construction. The dam accommodated a new pedestrian crossing, linking hiking trails and improving recreational opportunities of the area. D&K’s services included:

Coordination with NHDES Dam Bureau
Engineering safety inspection
Identification of deficiencies
Structural assessment and design
Hydrologic and hydraulic analysis and design
Geotechnical assessment and design
Evaluation of repair alternatives
Cost analysis
Preparation of an engineering report
Bid phase services
Construction engineering and oversight

Warners Corner Sidewalk

 

Design and construction phase services for new sidewalks along portions of roadways intersecting at Warners Corner. Scope of services included survey, right-of-way research, conceptual plans (right-of-way, utilities, and natural resource impacts), preliminary plans, cost estimates, and permitting. Project was funded by a Transportation Enhancement Grant, administered through the VTrans Local Transportation Facilities (LTF) Section, and followed the LTF Guidebook.

New sidewalks extend from intersection as follows: Macrae Road – north side approximately 1,300 ft to Mercier Drive; Prim Road – east side approximately 1,350 ft to Meadow Drive, including a multi-use path on the west side approximately 850-ft to the Visiting Nurse Association; Porters Point Road – north side approximately 450 ft to Bissette Drive, including a multi-use path on the south side approximately 100 ft along both legs of the intersection; and Heineberg Drive – east side approximately 1,025 ft to Bonanza Park.

Wake Robin Continuing Care Retirement Community

 

Mechanical and electrical design for a 17,000-sf addition, containing 18 skilled nursing beds, nurses stations, activities center, support areas, dining room and pantry, and 10,000-sf of unoccupied space for future expansion, storage, and mechanical rooms. The project included mechanical and electrical design for 37 new residential cottages, which are grouped into 5 single and 16 duplex units, with a basement option.

D&K engineers provided MEP design services for renovations to the existing community center, which included a cafeteria expansion, kitchen renovations, and resident activity area modifications. Designed new cooling/heating system for 12 existing resident rooms served by the eight geothermal wells that will be displaced by the expansion.

Mechanical services include heating/cooling calculations, heating/cooling system design, hydronic piping, fan coil unit ductwork, plumbing design, sprinkler system performance specifications, equipment selection review, and construction phase services.

Electrical services include electrical load and capacity calculations, equipment sizing, complete lighting and power circuit design, emergency power generation design, fire alarm system design, power and lighting design for the new cottages, site lighting and power distribution, distribution grid one-line diagram, utilities coordination, lighting specifications review, and construction phase services.

VTrans Survey Services

 

On-call contract to provide a wide range of survey services in support of Route Survey Unit mission on assignments throughout State. Services encompass two-dimensional and three-dimensional preliminary surveys, traverses, level loops, roadway centerline, runway centerline, staking for borings, staking for right-of-way bounds, cross-sections, property surveys, historic right-of-way research, providing control for photogrammetry, and as-builts. Work also includes providing all field notes in electronic format for topographic surveys (2D and 3D) and/or paper notes for traverses, curve data, ties, and benchlines. Specific assignments include:

Brandon, Pittsford. Historic right-of-way determination for US 7 and side streets in the Village. Performed Town record research for road survey before and after 1850, and compiled and analyzed VTrans data, parcel abstracts, and Secretary of State and other State and county records. Produced right-of-way plans, Town Road Report of surveys before 1850, and a Project Report to explain and defend historic right-of-way determination. Set monumentation on Route 7 and adjoining side street right-of-way limits. Produced plans for the resurvey of Route 7 to be recorded.

Parking Garage, Rutland. ALTA/ACSM survey of parking garage parcel based on record research of recent acquisitions of properties by the City and State to create a parcel for the parking garage and access routes.

Rutland City Bridge, Rutland. Survey and plans to realign a 210-ft bridge at the intersection of Town Highways 8 and 10. Full topographic survey for 2,000-ft of roadway and 300-ft of stream channel. Details include wingwall locations, dimensions, and elevations; abutment locations with bridge seat dimensions and elevations; and pier locations, dimensions, and elevations.

Otter Creek Bridge, Salisbury and Cornwall. 200-ft survey of Route 7 and 100-ft survey of a channel for a bridge rehabilitation located in a floodplain area. Topographic plans included right-of-way limits, drives, intersections, and drainage features within project limits.

I-89 St. Albans to Swanton. 6-miles of interstate survey on both the north and south bound lanes including control traverse and topographic surveys for reconstruction of the sub-base and five bridge decks and seven culverts.

Roadway Improvement Projects. Under multi-year contracts, provided survey for 14 roadway improvement design projects, encompassing over 80-miles of roadway throughout the State of Vermont, including field survey, base mapping, and construction layout.

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