Alexandria Advanced WWTP

Alexandria Advanced WWTP Upgrade, Project 1 and 2

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Project Location: Alexandria, VA

Contract Amount: $37,100,000

Project Description: This project, located in Old Town Alexandria, involved the construction of four new buildings and the retrofit of an existing facility built in 1956. The plant provides wastewater treatment for 325,000 people, including Alexandria and Fairfax County.

Contract 1 included the demolition of existing truck scales and construction of a new truck scale, a Filter Effluent Conduit, UV Disinfection Building, Post-Aeration Basins, plant water system and associated mechanical work in the basement of the Process Air Compressor Building.

The contract also called for the construction of a new Preliminary Treatment Building. Involved in this sub-project was the demolition of existing parshall flumes; building, yard, and gallery piping; sitework and road improvements; process and instrumentation controls work; building electrical work; site electrical work including relocation of existing duct bank and new electrical feed to the New Preliminary Treatment Building from the existing Main Building; fire alarm system; and fiber optic cable tray and fiber optic cable.

Contract 2 involved the construction of a new Administrative Building and Laboratory Building and associated support facilities. It also included associated mechanical, electrical, and plumbing work; site work, paving and storm sewer work; new electrical service from the existing AWT Building including all conduit and wire from the AWT Building to the Administrative/Laboratory Building; fire alarm system; and all fiber optic cable conduits. Laboratory casework in this new building was extensive, and included the following items:

• Fume hoods
• Biosafety hoods
• Glove box GBX
• Glove box vents
• Canopy hoods
• Instrument vent hoods
• Instrument vents
• Laboratory stainless steel sinks
• Laboratory epoxy resin sinks
• Laboratory cup sinks
• Laboratory scullery sinks
• Shower floors
• Eye/body wash units
• Laboratory service fixtures
• Furnishings and equipment

The provision of equipment, including deliveries and installations, was a major part of the work on both contracts. Coordination was critical to keeping the job on track. We furnished and installed the following equipment:

• Centrifugal pumps
• Mixers
• UV disinfection system
• Chemical metering pumps
• Sluice gates
• Fabricated stop logs
• Submersible pumps
• Progressing cavity pumps
• Grit separator mechanisms
• Grit cyclone and classifier mechanisms
• Influent screening systems
• Motorized automatic strainer
• Primary scum concentrator system
• Rotary positive displacement blowers
• Fine bubble diffuser system
• Automatic liquid sampler
• Truck scale system

W.M. Schlosser entered into a Partnering Agreement at the beginning of this project. Participants included W.M. Schlosser Company, Alexandria Sanitation Authority (the owner), the engineering firm CH2MHILL Constructors, and our major subcontractors.

The Partnering Agreement formed a cohesive cooperative construction team with a single objective. The group agreed to work together to establish mutual goals, clarify project roles and task assignments, promote effective project decision-making, resolve disagreements promptly and fairly, and commit to maintaining a healthy partnering attitude throughout the project.

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