Back River WWTP Baltimore, Maryland
On the Shore of the Back River
Owned and operated by the City of Baltimore, the project is located on the west shore of the Back River; just off of the Chesapeake Bay.
Two Projects Across 466 Acres
Crews are constructing two projects that include one the world’s largest nitrogen-removal filters, a dozen clarifiers, six large activated-sludge reactors and new pumps stations, as well as numerous facility upgrades across the plant’s 466 acres.
The $263 million enhanced nutrient-removal upgrade will create a massive nitrogen filtration system nearly 250 ft long by 350 ft wide, with 52 filter cells, which are each approximately 100 ft long and 30 ft deep.
ACTIVATED SLUDGE PLANT 4
The $282 million Activated Sludge Plant 4 project, will provide an additional 90 mgd of capacity at the facility via six activated-sludge reactors, with a combined volume of 40 million gallons.
One Million Cubic Yards of Material
Recouping Lost Time
In the early stages of the project, active winter weather caused delays in the teams concrete schedule.
In an effort to recoup lost time, Archer Western implemented double shifts in the following spring and summer months.
Accelerated Self Performance
With weather conditions on their side, crews poured the last three quarters of concrete in the same amount of time it took them to pour the first quarter.
Limited Workforce for Massive Project
One of the largest challenges was presented before any work began. To properly staff both projects, Archer Western needed to employ hundreds of workers on the massive site.
Assembling a Dedicated Team
By utilizing resources and hiring new professionals, Archer Western was able to successfully assemble a project staff that included nearly 700 dedicated tradespeople, along with local MBE and WBE partners.