Martinsburg Wastewater Treatment Plant
Location: Martinsburg, WV
Owner: City of Martinsburg
General Contractor: HRI, Inc.
Value: $1.6 Million
Completion Date: December 2014
The City of Martinsburg's Sanitary Sewer System consists of more than 100 miles of gravity sewer line, varying in size from 6" to 32", and two lift stations to convey the city's wastewater to a central treatment plant. The City's treatment plant is capable of treating up to 10 million gallons per day, with treated effluent being discharged into Tuscarora Creek.
In 2012, as part of the Chesapeake Bay Restoration Program, the City of Martinsburg initiated an upgrade to bring their system into compliance with the U.S. Environmental Protection Agency's new pollution control nitrogen and phosphorous discharge mandates.
The consulting firm of O'Brien & Gere was selected to provide comprehensive wastewater treatment engineering services to upgrade the facility and its nutrient removal system to meet the requirements of West Virginia Department of Environmental Protection's National Pollutant Discharge Elimination System (NPDES) permit and consent order.
The Utilities Division of HRI, Inc. of State College, PA was awarded the contract to perform the plant upgrade. The treatment plant upgrade is the largest public works project in the City's history and includes the incorporation of a new Moving Bed Biofilm Reactor (MBBR) system, which is central to the overall process upgrade, and numerous other process improvements.
Brayman was contracted by HRI, Inc. to install 334 drilled shafts with diameters from 24" to 48". The drilled shafts provide foundation support for three new process structures, including a Nitrification Tank and two Sludge Pumping Stations. Brayman also worked with AMEC Earth and Environmental to design and construct temporary support for excavation systems for the new process structures. All of the excavation support systems utilized soldier piles and lagging with a combination of cantilever soldier piles, top bracing and tiebacks for lateral support.
Due to the large number of individual structures and the degree to which they are integrated from a process standpoint, a high amount of coordination with the prime contractor was required in order to get the work done without interrupting scheduled plant operations. Additionally, an aggressive schedule was necessary in terms of deep foundation installation to get critical process facility construction underway so that the overall project schedule could be achieved.