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.
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Plutonic Rock (Igneous)
Plutonic Rock (Igneous) Definition The term “Plutonic” in the field of geology refers to an igneous rock, wherein the magma had originally cooled, solidified, and crystalized underground. A plutonic rock is generally coarsely crystalline (phaneritic) and is formed during a massive geologic intrusion of magma. In fact, outcropping (or daylighting) plutonic rocks are geologic features…
Transgression
Transgression Transgression: In geology, the term transgression is the formation of a specific sequence of sedimentary and metamorphic layers, that are the result of ocean water advancing onto land. To illustrate, when transgression occurs over millions of years, geologists find a layer of sand, overlain by shale, and overlain again by limestone. The opposite of…
Recurrence Interval
Recurrence Interval Meaning In the field of geology, the term “Recurrence Interval” refers to the average time interval that occurs between two recorded events of seismic activity, of equal magnitude, along the same fault.
Environmental Due Diligence | Indoor Air Quality Protection | Land Development & Real Estate | Methane Mitigation | Remediation & Clean-Up
City of Long Beach Methane Gas Zone Mitigation
City of Long Beach Methane Gas Zone Mitigation A City of Long Beach Methane Gas Zone represents areas with high levels of subsurface natural gas and methane soil gas. These areas present explosion hazards for buildings, due to biogenic and petrogenic gases of decomposing petroleum deposits, and landfills. As a result, the Building and Safety Bureau…
Environmental Due Diligence | Environmental Engineering & Construction | Land Development & Real Estate
What is the Phase I Environmental Site Assessment Process?
Phase I Environmental Site Assessment Process The Phase I Environmental Site Assessment process comprises a rigorous review of a property’s history, along with a physical inspection of the current conditions. And the end result is a lengthy report that follows regulation standards. For the convenience of Clients, environmental consultants usually provide executive summaries at the…
Dry Density (ρd)
Dry Density (ρd) “Dry Density” (ρd) is a value that represents the density of soil when it is completely dry. To illustrate, it equates to (“bulk density” / 1) + “water content.” This is a common geotechnical engineering laboratory procedure. Dry Density Formula Dry Density = [(Bulk Density ÷ 1) + (Water Content)]