Sustainable Site Design & Green Technology
As water quality in the Chesapeake and Atlantic Coastal Bays continues to decline, regulators are shifting their focus towards non-point source (NPS) pollution to achieve nutrient reduction goals. Of particular concern is the impact of urban stormwater runoff on receiving waters. In the mid-Atlantic, recent updates to stormwater regulations have prompted a change in stormwater management (SWM) strategy to Environmental Site Design techniques, which focus on micro-practices to maintain existing site hydrology and minimize the release of pollutants downstream.
GMB’s stormwater team has been pioneering innovative stormwater management solutions for over a decade. Our solutions implement low-impact development and environmental site design techniques. Our knowledge of the regulations, as well as our outstanding relationships with review agencies will enable us to move your project forward in a timely matter, while minimizing impact to the environment.
STATE OF DELAWARE (DE) REGULATION UPDATE
In November of 2008, the State of Delaware adopted the Delaware Inland Bays Pollution Control Strategy (PCS) to facilitate a reduction in the amounts of nitrogen and phosphorus entering the Inland Bays and their tributaries to levels required to meet water quality standards and State-regulated Total Maximum Daily Load (TMDL) goals. The TMDL for the Inland Bays established that non-point sources of nitrogen and phosphorus be reduced by 40 to 85 percent to bring water quality to a level sufficient to protect human health and support aquatic life. The new regulations require the use of Green Technology BMPs or Sustainable Site Design Practices to achieve required levels of stormwater management.
STATE OF MARYLAND (MD) REGULATION UPDATE
On May 4, 2009, the Maryland Department of the Environment (MDE) enacted new regulations that mandate the use of Environmental Site Design (ESD) to the maximum extent practicable (MEP). The goal of these regulations is to maintain the pre-development site hydrology as nearly as possible after the project is developed. Conservation of natural features, minimizing impervious surfaces, and micro-scale practices to capture and treat and recharge runoff are encouraged. Traditional structural BMPs will no longer be allowed until all ESD options have been exhausted.
STATE OF VIRGINIA (VA) REGULATION UPDATE
In April 2008, the Center for Watershed Protection, through the VA Department of Conservation and Recreation, released the Draft Runoff Reduction Method Technical Memorandum. The new methodology incorporates environmental site design and runoff reduction into the regulations, and sets site-based nutrient load limits so that nutrient reduction goals outlined in the Tributary Strategies can be met. If adopted, Virginia’s proposed regulations will be consistent with methodologies adopted by Maryland and Delaware, and will have long range implications for land-disturbing operations in order to better address water quality and quantity issues statewide.