Did you know that Gannett Fleming has 200 of the industry’s best and brightest infrastructure professionals right here in the Chesapeake Bay region—all at the ready to solve your most pressing water, wastewater, and stormwater challenges? But our resources don’t end there. The local team is backed by our North American network of more than 2,500 employees, all of whom are united in a commitment to deliver excellence on your projects and in your communities.

Learn more about how we partner with utilities and municipalities throughout the area in one of Gannett Fleming’s four presentations at this year’s Chesapeake Tri-Association Conference (Tri-Con) at the Powell Convention Center in Ocean City, Maryland. From treatment solutions including design-build for per- and polyfluoroalkyl substances (PFAS) to sustainable water storage and more, our sessions are rich with information that will add value to your next project!

Read on to preview the details for each presentation. Or, learn more about Gannett Fleming’s forward-thinking water solutions. We hope to see you at Tri-Con.

Join Our Experts at the Chesapeake Tri-Association Conference (Tri-Con)

Extreme Makeover, Sediment Basins Edition: Conversion to Submerged Gravel Wetlands at Fullerton

Wednesday, Aug. 31, 2022 • 1:30 p.m. • Room 217
Headshot of Brenda Guan
Brenda Guan, PE
Civil Designer
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Consisting of three closed, concrete tanks with a combined capacity of 62 million gallons, the Fullerton Reservoirs project was designed to provide additional finished water storage for the City of Baltimore, Maryland. At its outset, the project also was proposed to include two large-scale sediment basins, each receiving drainage from 20 acres during construction. While the majority of Environmental Site Design facilities face restrictions on maximum drainage area (DA), a larger DA is required for submerged gravel wetlands to ensure peak performance for pollutant removal.

In consideration of existing site conditions and in lieu of the sediment basins, the design team proposed four stormwater management facilities (SWM), including a bio-swale, a grass swale, and two submerged gravel wetlands, to treat all runoff from the site. To accomplish this, at the end of construction and once the site was fully stabilized, the team converted the two sediment basins to submerged gravel wetlands. This presentation explores the benefits of converting sediment basins to SWM facilities, including considerations during a project’s construction phase.

Learn more about the Fullerton Reservoirs project in this brief video below.


1 Million Gallons of Drinking Water Storage Replacement for the Town of Middletown

Wednesday, Aug. 31, 2022 • 1:30 p.m. • Room 205-206
Nick Lewis portrait.
Nick Lewis, PE, PMP, ENV SP
Utility Engineer
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In 2017, the Town of Middletown, Maryland, was done chasing leaks and making repairs to two ground impoundment storage reservoirs, the embankment of which was constructed in the 1890s. To meet the future drinking water needs of its 5,000 residents, the Town authorized the evaluation and design for the replacement of the reservoirs with enclosed storage.

Online since 2021, the new storage facility includes a split-cell AWWA D-115 concrete tank that sits partially buried in the footprint of the old embankment. This presentation delves into the capacity storage analysis, storage tank technology evaluation, and the use of 3D modeling and virtual reality for as-builting the design to bring this 19th-century reservoir into the 21st century.

Leveraging the successful Middletown project as a case study, session attendees will learn the process used for storage capacity analysis, the pros and cons of the different drinking water ground storage tanks available in the market, and the applications for 3D modeling and virtual reality for water process design.


Let’s Break Down Forever Chemicals: Insights from the Design-Build Approach to PFAS Treatment

Thursday, Sept. 1, 2022 • 3 p.m. • Room 203-204
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Daniel Jeon, PE, PMP, ENV SP
Senior Project Manager
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To provide a margin of protection from a lifetime of exposure to PFAS, including perfluorooctanoic acid (PFOA) and perfluorooctanoate sulfonate (PFOS), in drinking water, the Environmental Protection Agency established a health advisory level of 70 parts per trillion (ppt) and is planning to enact a national primary drinking water regulation by 2023 for PFOA and PFOS that would set enforceable limits and require monitoring of public water supplies.

For small and large water utilities alike, regulatory compliance within a mandated time period can present significant operational and compliance challenges.

  • What are the water treatment technologies and operation and maintenance considerations for PFAS removal?
  • How can the construction of PFAS treatment infrastructure be expedited by design-build delivery?
  • What scope items should be included for engineering and/or design-build contracts to ensure compliance with PFAS requirements?

This presentation seeks to answer questions like these through the perspectives of the design consultant and construction contractor – as a design-build team – for PFAS treatment projects in New York. New York State adopted the enforceable limits of 10 ppt for PFOA and PFOS in 2020 and requires water utilities to complete PFAS treatment within 24 months. To meet this aggressive schedule, design-build project delivery is optimizing resources and collaboration among the client, engineer, and contractor.

Insight from these projects provides valuable information for utilities preparing for the upcoming PFAS regulations in each state that has not adopted the enforceable regulations.


In the Thick of Things: Measuring In Situ Drywell Can Thickness to Guide Rehab and Replacement Investments

Friday, Sept. 2, 2022 • 10:45 a.m. • Room 217
Portrait of Mike Trail
Mike Trail, CCM
Construction Manager
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Asset management is a critical topic for all municipalities. Predicting when an asset will reach the end of its useful life is always difficult. As budgetary belt-tightening continues for public works agencies across the mid-Atlantic region, municipalities are challenged to find efficient ways to evaluate subsurface assets and determine when repairs or replacements are necessary so that projects can be properly budgeted.

Sewage pumping stations are a significant part of any municipality’s sanitary sewer system. Anne Arundel County, Maryland, retained Gannett Fleming to evaluate the steel drywell shell thickness of 101 sewage pumping stations to assess their level of corrosion or deterioration. This presentation unpacks the details of the non-destructive test methods and the program for collecting steel wall thickness data and comparing the results to physical measurements and also as-builts.

By the end of the presentation, attendees will better understand non-destructive testing measurements as they relate to determining the percentage of steel wall thickness remaining in sewage pumping station drywells, as well as lessons learned to improve planning and budgeting for asset replacement.

One Water Solutions

  • Alternative delivery.
  • Asset management.
  • Collection and conveyance.
  • Condition assessment.
  • Construction management.
  • Dams and reservoirs.
  • Environmental resources.
  • Geospatial.
  • Low-impact development.
  • Nutrient management.
  • Operations and maintenance.
  • Program management.
  • Pump stations.
  • Recharge wells.
  • Reuse.
  • Security and safety.
  • Smart water infrastructure.
  • Storage tanks.
  • Stormwater.
  • Transmission and distribution.
  • Utility master planning.
  • Valuation and rate studies.
  • Water/wastewater treatment.
  • Water resources.