Water and Sewer Transmission and Collection
Our team of waterline and sewerline specialists spend each day creating ways to deliver creative solutions to store and move water and collect and discharge sanitary sewage.
Our approach begins with planning and modeling in order to analyze the pros and cons of different solutions, as we want to ensure every solution is developed with the needs of the present and the unknowns of the future in mind. Our team specializes in providing:
Water Booster Pumping, Storage & Transmission Lines
Wastewater Pump Stations & Force Main Collection Lines
Wastewater Gravity Systems
Capital Improvement Plans
User Rate Studies
Preliminary Engineering & Environmental Assessment Documents
Our Work in Your Communities
Regional Transmission Mains - Neuse Regional Water and Sewer Authority
Creative policy-making helped supply clean water to 38,000 customers
The Neuse Regional Water and Sewer Authority in NC provides treated water at wholesale rates to its eight member entities (retail providers) within Lenoir and Pitt Counties.
Our teams facilitated a transmission main project for the Authority which consisted of 38 miles of 30-inch through 42-inch mains extending from the 15 mgd regional water treatment plant on the Neuse River just west of Kinston, to the vicinity east of Ayden in the Eastern Pine Water Corporation service area.
The project also included approximately 33 miles of 8, 12, 16 and 20-inch mains to deliver water at selected points within the eight member service area. In addition to the piping, the regional delivery system project included three elevated tanks (1.5 MG, 1.0 MG, and 0.75 MG), four booster pumping stations, 18 pressure reducing valves and metering stations with related appurtenances.
We saw the project through from inception to completion, including preparation of the $66 million USDA funding package, as it provided not only design services, but also construction contract administration and construction observation for the 1,200 pipes, 36 elevated tanks, 64 well pumps, and 7 booster pumping stations as they were installed.
Bentley Woods Waterline and Gravity Sewer Extension - Raleigh, North Carolina
Managing construction in an established neighborhood provided service to 18 new households
The City of Raleigh had annexed the Bentley Woods subdivision in two different phases and needed to extend water and sewer services to the area. Our teams assisted in the design of the utility extension for both phases, where 23,000 LF of 8 inch gravity sewer was extended and 21,000 LF of 6 through 12 inch water line was replaced in Phase 1, and 7,500 LF of 8 inch gravity sewer and 5,000 LF of 6 inch water line were extended in Phase 2. Since the project areas were provided water services through Asbestos Cement (AC) water lines, the project also involved abandoning these waterlines in place (pressure granted) and replacing them with new Ductile Iron water lines. The project was located in a well established neighborhood built in the 1970’s which made design and installation of the new utilities even more challenging as priority was placed on minimizing any impacts to its residents.
Sewer Improvements Along Smith Creek - Raleigh, North Carolina
Extensive preliminary planning guided the project as the City increased capacity in the rapidly growing area
The Smith Creek Interceptor Improvements Project was a major sanitary sewer project completed for the City of Raleigh but located in Wake Forest. The City of Raleigh owns, operates, and maintains the water and sewer utilities in many neighboring communities, and the project was part of a merger agreement between the Town and City to handle known inflow and infiltration issues in the area, as well as to accommodate for rapid growth in the Town.
The critical interceptor extends from the NC Highway 98 bypass and flows directly to the Smith Creek WWTP. In addition, the Tom’s Creek interceptor was part of the project, flowing from the east and tying to the Smith Creek interceptor just outside of the plant. The 43,000 linear feet of sewer involved had existing diameters ranging from 8-24 inches.
The initial phase of the project was a preliminary study which included a condition assessment of the existing line, geotechnical work, and an environmental study to determine the impacts of construction on the surrounding environment. Three options were identified to add capacity to the existing system: Parallel and abandon the existing line, parallel the existing line while keeping the existing line in service, or replacing the existing line in place. In the end, a combination of the options was chosen to suit local conditions of the corridor, but generally the existing line was kept in place and in operation while adding a parallel sewer for additional capacity.
After completion of the preliminary phase, The Wooten Company provided hydraulic modeling, design, and permitting services for the project. Unique challenges in the design included the acquisition of over 100 sewer easements, a crossing of a 4 lane controlled access highway (NC Highway 98 Bypass), work around new and existing Town of Wake Forest greenways, and the tight corridor due to North Carolina owned conservation lands. The newly installed parallel pipe diameters ranged in size from 15” to 36” inch, with approximately 20,000 linear feet of the 43,000 installed being 30 inch diameter.
The project bids for the $10M project came in approximately $1M below the estimated budget and out teams provided as-built survey and record drawings for the project after construction was completed in spring 2016.
Piney Green Road Trunk Sewer - Onslow Sewer and Water Authority
Close coordination with NCDOT led to cost savings for all parties
Having recently come to an agreement with the City of Jacksonville, NC to share the costs and ownership of Phase III of the Piney Green Sewer project, ONWASA determined that the NCDOT Piney Green road-widening project presented an opportunity to economically construct roughly 23,000 feet of trunk sewer along Piney Green Road as a part of the DOT project. The project required coordination with DOT construction and our team provided the preliminary engineering, design, permitting, easement surveys and acquisition and bidding services for ONWASA’s portion of the project. Design plans called for the installation of a combination of gravity sewer and force main as the project also prepared for future increased needs by setting up an initial duplex station with odor control that had the ability to expand from 1000 to 2100 gpm. After the design phase was completed, we performed construction contract administration and construction observation as the contractor utilized horizontal drilling to overcome several creeks. While the entire line, pump station and odor control project was designed by our teams, a portion of the line was constructed by the DOT as a part of U-3810 road widening, requiring that our construction observers worked together with NCDOT and that all work constructed by NCDOT was designed to their standards and bid as part of the U-3810 project.
Terrington Pump Station and Force Main - Cary, North Carolina
Anticipating impacts kept this service extension efficient and economical
The Town of Cary, NC needed to provide sewer service to a new area within its town limits, which would involve a new 225 GPM pump station, force main and gravity sewer, grinding/screening unit, pump and wetwell, odor control system, primary and backup power system, pump control and phone service. After analyzing alternative and comparing for cost of construction, easement acquisition, capacity impacts and downstream sewer and head conditions, our sewerline specialists provided design services that guided flow from the new station into the existing gravity collection system. As an additional benefit, the pump station now also has the ability to increase capacity to 300 GPM in the future.
Water Distribution System and Elevated Tank - Granite Falls, North Carolina
Creatively funding new infrastructure led more than 50 new jobs
A water system analysis for the Town of Granite Falls found that additional elevated storage capacity was needed in the southeast quadrant of the distribution system. With the possibility of industrial and commercial development in this area, the Town of Granite Falls looked to our team to design waterline extensions as well as a 1.0 MG elevated tank. Using the creation of new jobs as leverage, our funding specialists assisted the Town and the local Council of Governments in securing over $2,300,000 in grant funds from various agencies that included Golden Leaf, the Appalachian Regional Commission, US Department of Commerce and others, prior to kicking off the project's engineering design. In addition to the design, we provided contract administration, construction observation and grant administration services for the $3 million improvements, ultimately bringing more than 50 new jobs to the area.
Water System and Operations Evaluation - Aiken, South Carolina
Sitting down and talking through problems to develop a game plan
In discussions with Utilities and Engineering staff that focused on challenges the City faced pertaining their critical infrastructure, one of the more prominent challenges identified was the magnitude of pipe failures being experienced throughout the City's potable water distribution system. These failures ranged from active leaks and service line ruptures, to distribution main breaks.
Potential causes such as water hammer, infrastructure age, condition and system configuration were identified as broad initial targets, and solutions including implementation of variable frequency drives on booster pumps to minimize water hammer were discussed. Through the City sharing their approach to cataloging the location, size, age, material and other features of the pipe lines within the system, the groundwork required to identify specific causes began. As the asset inventory development was wrapping up, we joined the City in taking a deeper look into the system, its features, its operational conditions, and its performance to identify improvements that would result in kinder and gentler operations for the infrastructure.
Throughout the process our team investigated various details of the City’s system, including the acquisition and evaluation of asset inventory data via GIS, site visits and interviews with operations staff, review of record drawings, operational data and work orders. Collectively, this information was compiled and analyzed to develop a road map for City staff to use that included capital improvements and operational considerations. It laid the groundwork between the City and its partners to guide City leaders in identifying the adjustments and changes needed to preserve City resources and bolster public confidence.
Parallel Force Main Improvements - Cary, North Carolina
The Town of Cary desired to install redundant force mains at its permanent pumping stations and associated force mains to allow flow to be re-routed in the instance of an emergency, or simple maintenance.
The Wooten Company was asked to assist the Town to study five existing wastewater pump station/ force main systems to determine an appropriate routing of a new redundant force main within each of these systems. The pump stations were the Walnut Creek, Jones Franklin, Aviation Parkway,
Nelson Road, and Crossroads Pump Station. The routings were evaluated based on various factors such as land needs, constructability, hydraulic suitability, utility conflicts, public disturbance, and cost. A hydraulic model was established and calibrated for each system to confirm that pumping the alternate direction could be achieved with the existing stations. The total length of force mains were estimated at 17,500 feet and ranged from 6-inch to 16-inch in diameter. Upon completion of the study phase, the project moved forward in the design and construction phases. Over the course of the design phase various factors resulted in the Nelson Road and Crossroads systems being removed from the scope and replaced with the Blanche Drive and
Talloway Drive systems. Due to these changes, the timelines varied by system as the project moved forward to maintain progress.
To date, construction of three of the force main systems has been completed and are currently in operation. The completed force mains for Walnut Creek and Jones Franklin were located near and in the heavily developed Crossroads Shopping Center. These were designed to minimize conflicts to traffic, utilities, easements, cost and other pertinent parameters. The Blanche Drive redundant main was largely completed through a residential area but many of the same factors were considered. The remaining two force main systems, Aviation Parkway and Talloway Drive, are nearly complete with the design phase and it is anticipated that both will be moving into construction in Summer 2017. These projects also include improvements at the pump station
including addition of flow meters, grinders, rearrange station piping, add vapor-phase odor control, and add pigging stations/bypass connections.
The first phase of Parallel Force Mains was a unique project and a first for the Town of Cary. This project has allowed uncommon flexibility in the operation of their system and reduces risk in the event of failures either in downstream receiving sewer or primary force main routes. The Wooten Company
has provided value to the Town through many facets of the project including development of non-Town standard specifications, assistance in integration of instrumentation at each site, assistance in negotiating routes of proposed pipes with property owners, including commercial properties, and site improvements to pump stations including carefully planned valve arrangements. Another component to the project included the improvements on the pump station sites which were very compact and installation of odor control units at discharge locations within the parking lots of Lowe’s and HH Gregg. Improvements included new valves for operational flexibility in routing
Capacity Evaluation - Wake County, NC
Under an inter-local agreement, the area defined as Research Triangle Park (RTP) South is owned by Wake County, however the area’s sewer system is maintained by the Town of Cary. Jointly, both administrations sought to study the sewer system capacity in the area to determine current capabilities and evaluate future needs. The Wooten Company was asked to perform the study and analyze existing and projected flows through 2030 to determine what improvements would be necessary to ensure the continued reliability of the system. The project gathered data from previous reports, ongoing flow monitoring, inflow and infiltration analysis and information from multiple tenants within the RTP. As a result of the research, a report was provided that included phased recommendations to handle projected flows where the current system was deficient. The recommendations made within the report
ensured, if followed, that the system would meet needs in the RTP South area currently and over the following 20 years. The study was funded locally and the final report was given in September of 2010.