![]() ![]() This is known as the methane gas combustibility index. There is an optimal range of concentrations for methane gas to ignite. Each methane mitigation design intends to eliminate the combustibility factor of indoor air. Moreover, the flammable petrogenic gas has the tendency to rise to the surface and build up within the lowest occupied spaces of commercial and residential developments. Theoretically, the gas takes the path of least resistance and can build up within pockets, at high pressure. The subsurface soil gas does move through the soil. Thus, its presence within confining spaces isn’t easily detectable by humans. Petrogenic Gas via Thermal Decomposition of Organic Matter – Methane Mitigation Plan Combustibility Factor Most subsurface natural gas pockets warranting building vapor intrusion mitigation systems, are the result of organic thermal decomposition and petrogenic gas. Regardless of origin, both of these natural gases exist in the form of higher-pressure pockets underground. On the other hand, the explosive gas which comes from the thermal decomposition of organic matter underground is “ petrogenic gas.” This is most common within oil fields and tar pit areas. The combustible gas resulting from microbial decomposition is “ biogenic gas.” This type of gas is most identifiable in landfill areas, swamp fields, marshes, and wetlands. The formation of natural gas stems from the microbial and thermal decomposition of subsurface organic material. The term “ natural gas” means combustible hydrocarbon gas originating from natural biological and geological processes. Other components are ethane (C 2H 6), propane (C 3H 8), isobutane (C 4H 10), and various other hydrocarbons. Methane (CH 4) is the largest chemical compound of natural gas, in terms of volume. In fact, explosions and fires have occurred before, as a result of methane soil gas intrusion. And over time, the hazardous gas accumulates inside buildings and can concentrate to combustible levels. These land-uses create an abundance of subsurface methane gas. Typically, these zones (or districts) are a result of regional petroleum fields, oil drilling sites, and natural tar surfacing, as well as landfill areas. ![]() Similarly, other cities and counties in California, Colorado, and Texas also require a methane mitigation plan for buildings within special hazard districts. In fact, the City of Los Angeles has one of the initial building departments to ever enforce methane mitigation standards. These are special hazard districts that exist on the basis of their proximity to oil and gas wells, petroleum fields, and landfills. When is a Methane Mitigation Plan NeededĪ methane mitigation design is a requirement for new development projects within Methane Zones or Methane Buffer Zones. And for more information about barrier construction, please review Geo Foward’s post “What to Know About Methane Mitigation Construction.” And no possible benefit nor loss occurs from any result of a methane test report or mitigation plan design. Geo Forward’s testing methods and mitigation designs are purely objective and are in general conformance with LADBS standards. Furthermore, Geo Forward does NOT affiliate with any other methane mitigation construction company or part suppliers, for the same reasons. In order to offer these professional services in good faith, Geo Forward does NOT provide methane barrier construction or mitigation system installation services, nor does it offer parts sales. Geo Forward only provides methane testing, methane mitigation design, and methane deputy inspection services.
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