Sanitary Sewer System Expansion Project

Location: Cave Creek, Ariz.

Client: Town of Cave Creek

Completion Date: Design - April 2008Construction - April 2009

Burns & McDonnell is providing comprehensive planning, programming and architecture/engineering design services for a new 0.75-million-gallon-per-day (MGD) wastewater treatment facility for the Town of Cave Creek to replace its existing plant.

This project represents the largest public works infrastructure project undertaken by the Town of Cave Creek.

  • Design-build
  • Site development
  • Permitting
  • Conveyance
  • Treatment
  • Reclamation
  • Project observation and closeout

Sewage will be conveyed from the existing treatment plant site 22,000 feet by force main and gravity sewers to a new site. The new site will provide screening and grit removal before treatment with the sequencing batch reactor process. The final treatment process will be filtration followed by disinfection with hypochlorite. Treated effluent will be pumped back to the old plant site for discharge to golf course irrigation ponds. Solids will be dewatered and disposed at a local landfill. Chemical odor control will be provided for the treatment facilities, which will also meet all regulatory property set back criteria.

The site will provide for expanded treatment capacity of 1.5 MGD. Administrative facilities will house the wastewater treatment operations as well as a newly acquired water system and the town’s public works operations. Laboratory facilities for both water and wastewater are provided in the administration facility.

Permitting is required for the plant and disposal of effluent. An aquifer protection permit is required for the treatment process and will include provisions for reuse of the Class A+ effluent for golf course irrigation. The town also wants flexibility to discharge directly to a nearby wash. A new Arizona Pollution Discharge Elimination System permit will be required for this surface discharge option. Permitting for recharge will be detailed to avoid affecting two downgradient landfills that have been closed but are under a consent decree for trichloroethylene cleanup. Boundaries for potential future aquifer injection and recovery well sites will be defined.

The design-build team is responsible for transferring operations to the new treatment plant site from the existing plant site without interruption of service. The team is responsible for decommissioning of the existing facilities and meeting Arizona Department of Environmental Quality closure criteria.