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.
SERVICES
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.
This month, we recognize the employees celebrating work anniversaries at Hoyle Tanner. Together, they represent 59 years of service to our company. We thank them for their dedication, hard work, and contributions to our team’s success.
Happy Parks and Recreation month! This month, we celebrate some cornerstones of our communities. When you think of public parks, maybe you think of Leslie Knope on the comedy...
After 40 years in the civil engineering, surveying, and consulting industries, Tim Bernier, LLS, PLS, CWS, is retiring from Hoyle Tanner as Principal Surveyor. Throughout his career, Tim has...
Meet Sarah Foy – Environmental Engineer & Wastewater Systems Advocate What drew you to Hoyle Tanner? The people! I worked in Matt Scarborough’s research lab in undergrad and heard...
Tyler Heinrich has achieved a major professional milestone by earning his Licensed Land Surveyor (LLS) credential. His accomplishment highlights years of dedication, expertise, and a passion for delivering high-quality surveying services to clients and communities across the region.
Anyone who flies with any regularity has felt it: long lines, confusing circulation through a terminal, or flights delayed not because of weather, but because of airfield capacity issues....
Hoyle Tanner is excited to welcome Evan Raymond, PE, to our Ground Transportation Division as a Senior Transportation Engineer. Based in our Yarmouth, Maine office, Evan brings nearly a decade of experience delivering roadway and multimodal transportation projects across northern New England.
We are pleased to recognize our employees celebrating work anniversaries this month. Collectively, these individuals have contributed 109 years of service to Hoyle Tanner, demonstrating the dedication and commitment that drive our continued success. We thank them for their valuable contributions and congratulate them on their anniversaries!
