Vapor Intrusion
Vapor Intrusion occurs when harmful soil contamination changes phase from liquid to vapor underground and moves upward through geologic layers and building foundations, accumulating within indoor air.
Vapor Intrusion occurs when harmful soil contamination changes phase from liquid to vapor underground and moves upward through geologic layers and building foundations, accumulating within indoor air.

Why Using the Methane Standard Plan Usually Fails Plancheck The methane hazard standard mitigation plans from the Los Angeles Department of Building and Safety (LADBS) offer guidance for vapor mitigation. However, it does not actually satisfy the plancheck requirement for a site-specific methane mitigation plan. Per the regulations in Division 71 of the Los Angeles…

Consistency The term “Consistency” in the fields of engineering geology and geotechnical engineering means the degree of adhesion between soil particles within a sample, that are observed to resist deformation or rupture.

Topple Definition Topple – Slope movement due to forces that cause an overturning moment about a pivot point below the center of gravity of the unit.

Boyle Dayton Los Angeles The Boyle Dayton Los Angeles Company was a reputable manufacturer and seller of fueling pumps and standalone underground tanks, for automobiles in the early 1900s. Unlike modern gasoline service stations, the Boyle Dayton Company was a specialty manufacturer of curbside fuel station accessories. Curbside fueling stations were common in America before…

Alquist-Priolo Earthquake Fault Zoning Act Alquist-Priolo Earthquake Fault Zoning Act: The Alquist-Priolo Earthquake Fault Zoning Act is a law that assists geologists to define “active faults” versus “potentially active faults.” The process entails using the same aging criteria as the United States Geological Survey (USGS) and the California Geological Survey (CGS). In fact, California policy requires…

Metamorphic Rock Definition In the field of geology, the term “Metamorphic Rock” refers to a rock classification that is the result of the alteration of prior existing sedimentary rocks or igneous rocks. The alteration process is “metamorphosis, and can take place by various methods and environments. The metamorphosis process produces specific metamorphic rocks, on the…