24 CFR Part 51 Subpart C - "Siting of HUD-Assisted Projects Near Hazardous Operations Handing Conventional Fuels or Chemicals of an Explosive Or Flammable Nature", establishes explosion and thermal radiation safety standards to determine an Acceptable Separation Distance (ASD) from potential hazards involving chemicals of an explosive or fire prone nature stored in above ground stationary containers.
HUD's Region IV office in Atlanta issued a December 5, 2011 memo describing how and when HUD regulation 24 CFR Subpart C applies to Manufactured Housing. Here is a link to the memo:
https://docs.google.com/open?id=0B8_KPWB0jP6AYzY4YTRjYTEtMDhhMC00MTFmLWI5MDAtMjQ4ODBlNjgxYzM0
For more HUD Environmental Guidance, go to: http://www.hud.gov/local/shared/working/r4/environment/index.cfm?state=ga
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