Haw River Interceptor

Client/Owner: City of Burlington, NC
Suggested Reference: Bob Patterson, City of Burlington
Total Construction Cost: $5,900,000
Project Scope: Sanitary Sewer Construction; Engineering Design, Construction Administration, Project Management, Permitting, and Easement Mapping
Reviewing Agencies: North Carolina Dept. of Environmental Quality
North Carolina Department of Transportation
Completion Dates: Winter 2017
Project Engineer: Mark Reich, P.E. (AWCK Burlington Office)
Asst. Project Engineer: Josh Johnson, P.E. (AWCK Burlington Office)


The City of Burlington was in need of a turnkey solution to assess, design, and construct a replacement for the aging Haw River Interceptor which was at risk of a catastrophic failure. AWCK delivered environmental investigations, floodplain assessments, full engineering design, and construction management services as part of the team which realized replacement of the existing 50-inch corrugated metal pipe with 8,300 linear feet of 24-inch, 36-inch, and 42-inch diameter sanitary sewer outfall. Existing pipe, which was installed in the early 1960’s, was laid directly on bedrock and located largely within the 100-year floodplain along Servis Creek and the Haw River.

AWCK worked extensively with the City of Burlington to analyze flow conditions within the sanitary sewer gravity service area and successfully manage bypass pumping of 4.50 million gallons per day (“MGD”) with a peak bypass of 24.0 MGD. This bypass pumping plan allowed for new pipe to be installed within the existing outfall footprint, thereby minimizing the need for additional rock excavation and significantly reducing potential construction costs.

Our Project Team coordinated closely with governmental agencies in order to complete environmental permitting without additional stream and wetlands mitigation requirements and oversaw sub-consultants who provided geotechnical and structural engineering assistance with multiple aerial crossings.

AWCK Engineers and Field Personnel are experts in providing sound engineering solutions and technical guidance in both overall systems evaluation and long-term rehabilitation planning for existing collection, conveyance, and treatment systems. Our teams have evaluated, designed, and managed improvement, replacement, and rehabilitation projects for every type of water and wastewater system component; and our knowledge of available revenue sources is fundamental in assisting the municipalities we serve meet their infrastructure needs.