Explosive and Flammable Facilities
There are certain hazards associated with specific hazardous facilities, which store, handle, or process hazardous substances of a flammable or explosive nature. There are inherent potential dangers associated with locating HUD-assisted projects near such hazardous facilities. Project sites located too close to facilities handling, storing or processing conventional fuels (e.g. petroleum), hazardous gases (e.g. propane) or chemicals of an explosive or flammable nature (e.g. benzene) is a matter of concern when conducting an environmental assessment. Calculating the Acceptable Separation Distance (ASD) is one of several steps toward determining site suitability for a proposed HUD-assisted project near hazardous facilities. Gathering specific site information using the guidance found in the guidebook “Siting of HUD-Assisted Projects near Hazardous Facilities" and the regulation 24 CFR Part 51 Subpart C, is a requirement for the determination of the ASD between the proposed HUD-assisted project site and the assessed hazardous facility. For further assistance contact the Environmental Contact in your area or Nelson Rivera at HUD Washington.
Acceptable Separation Distance (ASD) Electronic Assessment Tool
Barrier Design Guidance
Acceptable Separation Distance Guidebook - Office of CPD Environmental Planning Division (September 2011)24 CFR Part 51 Subpart C Mitigation Training Module (Powerpoint)
HUD Guidance and Technical Assistance
Is the property located near hazardous operations handling conventional fuels or chemicals of an explosive or flammable nature?
Threshold: Properties that are located near hazardous industrial operations handling fuels or chemicals of an explosive or flammable nature are subject to HUD safety standards (24 CFR 51, Subpart C). In the case of tanks containing common liquid fuels, the requirement for an acceptable separation distance (ASD) calculation only applies to storage tanks that have a capacity of more than 100 gallons.
Documentation: Grantees are to select the condition that best describes the project either A_ or B_ and document the source of the information.
- The grantee provides HUD a finding by a qualified data source stating: (1) that the grantee's proposed property is located within the immediate vicinity of hazardous industrial operations handling fuel or chemicals of an explosive or flammable nature; (2) the type and scale of such hazardous operations; (3) the distance of such operations from the proposed property; (4) a preliminary calculation of the acceptable separation distance (ASD) between such operations and the proposed property; and (5) a recommendation as to whether it is safe to use the property in accord with 24 CFR Part 51, Subpart C.
- The grantee provides HUD a finding from a qualified data source that the grantee's proposed property is not located within the immediate vicinity of hazardous industrial operations handling fuel or chemicals of an explosive or flammable nature by citing data used and the maps used.