2.1        Sediment Controls and Stormwater Management

2.1.1            Sediment and Erosion Control

Refer to Chapter 1.2.1 for Standard Maryland department of the Environment (MDE) Sediment and Erosion Control and 1.1 for Environmental Coordination and Permitting.

2.1.2            Stormwater Management (SWM)

The MDOT MAA Office of Environmental Services has prepared Institutional Stormwater Management Plans (IMPs) for BWI Marshall and Martin State Airports. Existing Conditions have been documented and approved by MDE for both BWI Marshall and Martin State Airports; future conditions are currently under development. The IMPs shall be utilized by consultants and requirements of these documents shall be followed in the design and construction of projects at BWI Marshall and Martin State Airports. Contact the MDOT MAA Environmental Planning Section for additional information.

The following information outlines the general requirements for SWM at BWI Marshall and Martin State (MTN) Airports.

2.1.2.1          Stormwater Management Requirements

Consultants must comply with the Maryland Department of the Environment’s (MDE’s) stormwater management requirements as set forth in MDE’s Maryland Stormwater Design Manual Volumes I & II, current edition and all subsequent revisions, and the Stormwater Management Act of 2007. The regulations outlined in this manual must be used during the design of all new stormwater management facilities on MDOT MAA-owned properties. MDE requires a comprehensive design strategy for maintaining predevelopment runoff characteristics and protection of natural resources, known as Environmental Site Design or “ESD,” which relies on integrating site design, natural hydrology, and smaller controls to capture and treat runoff. The “Maryland Stormwater Management and Erosion & Sediment Control Guidelines for State and Federal Projects,” “Maryland Stormwater Management Guidelines” and MDE Technical Memorandum #1 should be utilized in design.

Consultants must also comply with enforceable guidance set forth by FAA. To ensure the safety of the traveling public, consultants must adhere to FAA’s enforceable guidance set forth in the latest FAA AC 150/5200-33 Hazardous Wildlife Attractants on and Near Airports to minimize wildlife strike hazards through the reduction of wildlife attractants.

FAA defines a wildlife attractant as:

Any human-made structure, land use practice, or human-made or natural geographic feature that can attract or sustain hazardous wildlife within the landing or departure airspace, aircraft movement area, loading ramps or aircraft parking areas of an airport. These attractants can include but are not limited to architectural features, landscaping, waste disposal sites, wastewater treatment facilities, agricultural or aqua cultural activities, surface mining, or wetlands.

The AC also provides guidance on placement and design of these facilities to achieve water quality goals while minimizing the potential for creation of a wildlife attraction. FAA’s siting criteria for potential wildlife attractants state that wildlife attractants should not be within 10,000 feet of an airport’s aircraft movement areas (including loading ramps and parking areas) or within 5 statute miles of approach or departure airspace, if the attractant may cause hazardous wildlife movement into or across the approach or departure airspace. When facilities that create open water exist within 5 statute miles of the airport, FAA’s enforceable guidance requires that they drain within 24 hours following a one- or two-year storm event and within 48 hours following a ten-year storm event.