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1

Rockin’ the Centre Ridge BMP: Elevating Function and Enhancing Benefits Through Retrofit Design

Under a Stream Stabilization/Restoration, Environmental, Permitting & Ancillary Services Basic Ordering Agreement, Stantec was awarded a Task Order by the Fairfax County Department of Public Works and Environmental Services (DPWES) to provide Stream Restoration and Stormwater Best Management Practice (BMP) Retrofit Design and Construction Administration services for the Centre Ridge Basin Retrofit project in Fairfax […]

2

Adventures of Finding, Planning, Designing and Constructing TMDL Projects in a Rapidly Developing County

In a rapidly developing regions, finding and implementing TMDL projects can be challenging.  Once a project finds support and proceeds forward, the watershed and site conditions can often change in the time it takes to plan, fund, design and construct. Several projects in Loudoun County have been impacted by development (privately funded and publicly funded) […]

3

Evaluating the Hydrology, Water-Quality, and Ecological Communities of Two Restored Urban-Suburban Streams in Northern Virginia

The U.S. Geological Survey, in cooperation with Resource Protection Group, Inc., is conducting an intensive stream monitoring program of two restored, small (< 1.3 mi2), urban-suburban streams in Reston, Virginia. In 2010, both stream channels were restored to stabilize the banks, preventing channel incision, mass wasting of the banks, and the attendant deleterious sediment effects. […]

4

Total Kjeldahl Nitrogen (TKN) Dispersive Flux Water Quality Modelling by using Finite Segment Method (FSM), Lake Maurepas, near New Orleans, LA

The study investigates the impact from point source loadings into the Lake Maurepas near New Orleans, LA, which feeds into the Lake Pontchartrain, a large estuarine lake along the city of New Orleans connecting with the Gulf of Mexico.  The Gulf of Mexico along the coast of Louisiana had been experiencing numerous dead zone water […]

5

The Influence of Nitrifying Bacteria on Monochloramine Decay and Opportunistic Premise Plumbing Pathogen Growth

Drinking water infrastructure in homes and buildings provides a niche for water microbiomes. Higher surface area to volume ratios, stagnation, and disinfectant decay at point-of-use locations lead to microbial regrowth and a higher risk of exposure to opportunistic premise plumbing pathogens (OPPPs). Nitrifying bacteria are common inhabitants of drinking water systems and are known to […]

6

Stormwater Enhanced Coagulant Treatment for Cost Effective Pollutant Load Reduction

Coagulants are very effective for treating stormwater runoff and commonly achieve removal efficiencies of 80-90 percent for total phosphorus (TP), 35-65 percent for total nitrogen, 90+ percent for total suspended solids (TSS) and 90+ percent for pathogens. These efficiencies are higher than traditional stormwater treatment approaches. Enhanced treatment also requires much less land per watershed […]

7

Reducing the Regulatory Exposure from a Municipal Landfill and Meeting Bay TMDL Waste Load Allocations – A Case Study

The Virginia Pollutant Discharge Elimination System (VPDES) permit program may be best known by attendees for as the regulatory framework for the municipal separate storm sewer system (MS4) permit program but localities sometimes find themselves regulated under one of the VPDES industrial general permit program for stormwater discharges associated with certain regulated industrial activities. The […]

8

BMP Prioritization for TP Reduction in Virginia Beach

Municipalities subject to total maximum daily load (TMDL) requirements often seek more sophisticated methods for compliance. The City of Virginia Beach is subject to TMDL compliance across its jurisdiction with required total phosphorus (TP) reductions. Most of the Virginia Beach MS4 coverage area is located within the North Landing and Chesapeake Bay watersheds with specific […]

9

Determination of Advective or Diffusive/Dispersive Water Quality Flux Domain of the Lower Portion of the James River in Richmond, Virginia

The Peclet number is a flux characteristic parameter which represents the ratio of advective transport to diffusive/dispersive transport. A higher Peclet number indicates a bulk mass flow-driven advection dominated body of water that behaves similar to a Plug Flow Reactor, while a lower Peclet number indicates a diffusive/dispersive dominated body of water which is more […]

10

Rapid Data Collection for Accotink Stream Stability Assessment and Restoration Prioritization

The headwaters of Accotink Creek originate within the City of Fairfax (City). Accotink Creek is located within the Potomac River watershed, and its combined major tributaries account for approximately ten miles of stream throughout the City. As the City approaches the 3rd Phase of the Chesapeake Bay TMDL, there is an increased need for project […]