Constantine Engineering

Our Projects

Dauphin Island (AL) Water and Sewer Authority Reverse Osmosis Water Treatment Facility

Project Highlights

  • 1.3-MGD reverse osmosis treatment
  • LEED certified WTP building
  • 1,200-GPM raw water well facility
  • 6,000 LF of 12" raw water main
  • 21,000 LF of water distribution mains
  • 1-MG ground storage tank
  • Emergency stand-by generators
  • Reduced energy costs
  • Reduced water use
  • Healthy interior environment for staff
  • Community education resource
  • Reduced stormwater impacts
  • Construction provided support for regional economy

Dauphin Island Water and Sewer Authority (DIWSA) selected Constantine Engineering, Inc. (TCG) to plan, permit, design, and manage construction of its new 1.3 million gallon per day (MGD) reverse osmosis water treatment facility (RO WTF). The new RO WTF replaced the existing Dauphin Island water treatment plant and was completed in 2011.

Constantine worked with DIWSA from the early conceptual design of the RO WTF that included the construction of the RO Water Treatment Facility, a new 1,200 gallon per minute (GPM) raw water well, a new 1 million gallon ground storage clear well, installation of 6,000 feet of 12 inch raw water main and 21,000 feet of 6 inch, 10 inch and 12 inch water distribution mains, and decommissioning & demolition of the existing water plant. DIWSA financed construction of the facility through the Alabama State Revolving Loan funds as a part of the American Recovery and Reinvestment Act (ARRA). Constantine assisted DIWSA through the complete loan process and provided technical assistance that helped to secure financing that included $4.2 million in grant assistance and $2.7 million in low interest loan.

Constantine and DIWSA were committed to provide a low energy treatment facility. In an effort to provide an energy efficient, environmental friendly and employee friendly work environment DIWSA chose to pursue Leadership in Energy and Environmental Design (LEED) certification for the new RO WTF. The third party certification process validates and quantifies the energy efficiency and environmental achievements, while allowing the building to model better building practices to the community. The new water treatment plant is a unique LEED building, in that it is targeting increased efficiencies in process loads as well as in the base building envelope and systems. When the energy modeling process is complete, the DIWSA will have a metric to benchmark their energy use, and project the return on their investment in energy efficiency and environmental upgrades.

The DIWSA RO WTF is the largest of its kind in the State of Alabama and the first LEED certified municipal water treatment facility in the southeastern United States. All materials and installed equipment used in the facility are American made as defined by the ARRA.

Dauphin Island Water & Sewer Authority
Dauphin Island, AL