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Client: City of Atlanta
Location: Atlanta, Georgia, United States
Project Type: Wastewater Treatment Facility
Contract Amount: $37,000,000 USD
Delivery Method: General Contracting
Project Size: N/A
Start Date: March 2005
Completion Date: November 2006
Architect/Engineer: Parsons/Brown & Caldwell
Participating Alberici Enterprises
Services Performed
Markets Served
Custer Avenue CSO Dechlorination and Storage Facility
As part of the City of Atlanta’s $4 billion overhaul of the its combined storm water and wastewater sewer system, the $37 million Custer Avenue Combined Sewer Overflow (CSO)Storage and Dechlorination Facility helped bring the City of Atlanta into compliance with state and federal water quality regulations.
Upgrades to this facility include construction of an underground cavern in the form of an underground linear storage facility 50 ft. wide x 60 ft. high x 750 ft. long. This 10 million gallon capacity storage facility also required the construction of a new tunnel connecting this storage facility to the existing 34 million gallon Intrenchment Creek CSO Storage Tunnel increasing total capacity to 44 million gallons.
To access the cavern, a vertical 30 ft. diameter, 120 ft. deep shaft was excavated into rock and reinforced with concrete. The cavern was blasted out of granite rock. Drilling horizontal holes and packing them with 1500 pounds of explosives, the charge would fracture the rock which would then be hoisted out at a rate of 76,000 pounds per lift for a total of 90,000 tons. The cavern was reinforced with 20 ft. rock anchors, wire mesh and shotcrete.
Additionally, portions of the existing facility were demolished and replaced by two bar screens, two rotary drum screens, fine grit screens and grit removal, brush screens, pump station, new electrical room, filters and enhanced disinfection systems to control harmful bacteria and other residuals. Also included was the installation of intercept channels to prevent wastewater overflow from contaminating the storm water and a weir dam to control flow.
Having developed a partnering relationship with the City of Atlanta and the design team, Alberici worked with city commissioners and officials to involve and educate the community about the project. Through these relationships, the project was finished five months ahead of schedule without any damage to property.