Dimensions - January/February 2010/Annual Review 2009 - 14

wo major design-build initiatives underway at the Noman M. Cole, Jr., Pollution Control Plant (NCPCP) in Lorton, Virginia, will enhance flow equalization and add a new reclaimed water distribution system to reduce discharged effluent. The projects are the first to be completed using the design-build delivery method for the Fairfax County Department of Public Works and Environmental Services. The NCPCP opened in 1970 as an 18-million-gallonper-day (MGD) plant and has undergone three major upgrades to bring it to its current capacity of 67 MGD. The plant currently serves approximately half of Fairfax Countyâ€™s 340,000 households and businesses. The $8-million flow equalization project, now more than halfway complete, consists of the design, construction, and start-up of new equalization facilities that will reduce peak flows to the plantâ€™s biological nutrient removal activated sludge tanks. Using new pumping facilities, primary effluent will be temporarily routed to the new equalization tank during influent high-flow conditions. Stored effluent will be returned by gravity from the new tank to the primary effluent channel when influent flows decrease. Dewberry is working with Syracuse, New Yorkbased contractor M.A. Bongiovanni, Inc., on the design-build project, which includes a new 4-MGD equalization tank and the addition of 9.4 MGD of pumping capacity at the existing equalization pump station, including instrumentation and controls. The total project duration will span 18 months with completion scheduled for September 2010. T The Dewberry/Bongiovanni team has also begun work on a $15.2-million water reuse project for NCPCP that will reduce final effluent flow to Pohick Creek, a tributary of the Potomac River. Because the plantâ€™s biological nutrient removal and advanced wastewater treatment processes result in a highquality effluent, the discharge can be used as source of usable water for industrial and commercial non-potable applications. Construction of the new reclaimed water distribution system, which includes a five-mile pipeline, will allow for water to be reused at the Covanta Energy/ Resource Recovery Facilityâ€”one of the largest waste-to-energy facilities in the countryâ€” and as irrigation at the nearby Laurel Hill Golf Course and Lower Potomac Park ballfields. The project is being funded in part by a grant through the American Recovery and Reinvestment Act. Dewberry has completed extensive work at NCPCP in past years, including the engineering of a new 100MGD raw wastewater/equalization pumping station, a 16-million-gallon concrete equalization basin, several thousand feet of piping, a septage receiving facility, a tertiary clarifier, odor control facilities, and other improvements along with associated site development work. The previous expansion work was completed in association with CH2M Hill. Milestone Design-Build Projects Will Upgrade Virginia Treatment Plant 67-MGD Plant Serves Fairfax County Residents Top: Using 3D civil engineering technology, Dewberry has modeled the pipeline corridorâ€™s existing conditions, such as bridge foundations, existing utilities, and topography. By creating these dimensionally accurate models, Dewberry was able to show how to adjust the pipeline to better mitigate potential conflicts. Click the video above to review the modeled presentation. Bottom: Under construction at NCPCP, the new 4-MGD equalization tank will improve the plantâ€™s biological treatment process.

http://www.fairfaxcounty.gov/dpwes/wastewater/noman_cole.htm

Dimensions - January/February 2010/Annual Review 2009

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