South Woodstock WWTF Upgrade
Woodstock VT WWTF Upgrade
Hoyle Tanner completed the preliminary engineering study to upgrade the South Woodstock WWTF. The original WWTF was a 50,000 gpd package conventional activated sludge facility that had not been upgraded since 1966. Redundancy was not provided for process tankage including the aeration basin and secondary clarifier. Therefore, the process units could not be taken offline for tank inspection or repair. The facility is now required to nitrify and denitrify with an effluent Total Nitrogen (TN) limit in the NPDES permit. Additionally, a portion of the WWTF site is in the Regulatory Floodway, creating significant limitations on siting new process tankage.
For the upgrade of the WWTF, three process alternatives were considered: Sequencing Batch Reactor (SBR), Membrane Bioreactor (MBR), and submerged attached growth bioreactor (SAGB). The alternatives were evaluated based on a life-cycle cost analysis and non-monetary factors. The recommended alternative was an SBR process with an innovative equipment layout, allowing all process equipment to be accessed from above the water line. This allowed for a two-tank SBR process without pre-equalization to meet the Vermont DEC SBR design guidelines. This innovative approach saved capital cost while realizing a lower life-cycle cost, as well. The new facility was constructed and put into service prior to decommissioning the original facility. Construction of the new SBR facility was completed in 2023.
- Study
- Alternatives Development & Analysis
- Preliminary Design
- Permitting
- Funding Assistance
- Public Outreach
- Final Design
- Bid Process Administration
- Construction Administration
From the blog
Learn about ongoing projects and the innovative processes we employ for our clients.
From Plans to Pavement: Designing & Running the Revel Race Series on the Kancamagus Highway
October 15, 2024
On May 5th, 2024, I had the opportunity to see the result of a project that I was a part of when I was still interning at Hoyle Tanner,...
Read More
Employee Spotlight: Stacie Haskell
October 11, 2024
Meet Stacie Haskell – Senior Project Assistant & Dog Lover What drew you to Hoyle Tanner? I worked with Hoyle Tanner for years when I worked for MaineDOT. I...
Read More
October Employee Anniversaries
October 1, 2024
We are pleased to announce the following employees are celebrating employment anniversaries this month; combined, they have 111 years at Hoyle Tanner. The effort and dedication of our employees...
Read More
Hoyle Tanner’s Design Marks Historic Day at Presque Isle International Airport
September 27, 2024
JetBlue Opens New Route: Enhancing Connectivity in Northern Maine On September 5, 2024, the City of Presque Isle celebrated the inaugural flight of JetBlue from Boston Logan International Airport...
Read More
ENGINEERING EXCELLENCE: Celebrating Our Team’s Most Recent Promotions
September 18, 2024
William Davidson | Principal Engineer Bill has been promoted to Principal Engineer! Bill is a senior civil engineer responsible for leading our civil/site design and construction services for private...
Read More
From Interns to Career Builders: Celebrating the Journeys of Sarah & Rebekah
September 16, 2024
Join us in congratulating Rebekah Gebru and Sarah Foy, who have returned to our team as full-time employees after completing their internships with us. They both impressed us with...
Read More
How We’re Bringing Sustainability to Small Airports Through Design
September 16, 2024
Taxiway A’s rehabilitation is complete! The $6.14 million project updated the taxiway’s pavement, lighting and signage. It took extensive planning and design to bring this project to completion. Taxiway...
Read More
Employee Spotlight: Kelly LaVigne
September 13, 2024
Meet Kelly LaVigne, PE - Senior Structural Engineer & Mediocre Quilter What drew you to Hoyle Tanner? I’ve played field hockey with Kirstin DiPietro-Worden for close to 10 years...
Read More
How I Learned to Love the Fluffy Species: A Biologist’s Perspective on the Endangered Species Act
September 4, 2024
Prior to my career with Hoyle Tanner, I spent many years as a State Agency Wildlife Biologist with my primary focus on monitoring and managing “game” species of wildlife....
Read More