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RECENT PROJECTS

We offer a comprehensive array of engineering services for water and wastewater utilities, industries, and real estate developers. From initial planning through construction, our team members have the expertise and leadership to execute successful projects with efficiency and deliberate action.

The Muddy Creek interceptor serves an area of 82 square miles with approximately 650 miles of collection lines and 17,000 manholes. The Muddy Creek interceptor is the main trunk line within the service area and it consists of approximately 22 miles of cross-country pipeline, which originates as a 24-inch interceptor and gradually increases in size along its route until it enters the Muddy Creek WWTP site as a 66-inch pipeline.

Following increased wet-weather flow observations at the Muddy Creek WWTP, HIGHFILL was retained to develop a plan of action to identify and prioritize sewer rehabilitation requirements within the Muddy Creek basin. HIGHFILL has subsequently worked with CCUC to identify problems and design solutions for approximately 85,000 linear feet of sewer over the past 8 years.

The Queen Street Sewer Rehabilitation project consists of the condition assessment and rehabilitation of approximately 26,048 linear feet of 8- to 24-inch sanitary sewer and 50 manholes along Queen Street - from Springhill Road to Heritage Street and along adjacent Streets. Pipe bursting is the anticipated method of rehabilitation. The existing sewer is predominantly located in the middle of Queen Street, NC Hwy 58, and the adjoining streets.

Queen Street Sewer Rehabilitation
City of Kinston, NC
Muddy Creek Basin Wet Weather Deficiency Identification
and Repair Program
City/County Utilities, Winston-Salem, NC
Pump Station 10 Improvements
Cape Fear Public Utility Authority, Wilmington, NC

At 14.7 MGD, Pump Station 10 is the largest wastewater pump station in the CFPUA system. When historical flow records indicated that the station was operating at capacity, CFPUA hired HIGHFILL to develop a plan of action and to design for station expansion.

 

HIGHFILL recommended updating population and flow projections and performing a Criticality Assessment of the station to better define what the expansion would need to include before proceeding with design. The future capacity needs were determined to be 24 MGD. The Criticality Assessment process was utilized to rank assets and prioritize improvements.

 

The capacity expansion required the preparation of an Environmental Assessment (EA). The Alternatives Analysis for the EA included options to replace the station in addition to the original renovation option. Ultimately, the replacement option was selected as preferred. The EA has been completed.

 

Field observations prompted a recommendation for CFPUA to review recent flow records for the station. That review revealed that upstream rehabilitation projects had significantly reduced the baseline flow to the station, essentially diminishing the urgency for capacity expansion. With capacity no longer the primary driver, HIGHFILL was asked to perform a condition assessment of the station to develop an opinion of remaining useful life for use in scheduling design the replacement. During the condition assessment HIGHFILL and S&ME discovered liner failures in the wetwell and a junction box along with significant concrete loss and exposed rebar in the screening structure. HIGHFILL worked with CFPUA to get urgent repairs added to an active construction contract for the rehabilitation of interceptor lines feeding to the pump station. The urgent repairs are complete, and a technical memo has provided CFPUA with condition assessment results and recommendations.

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