Glossary

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GAS CHROMATOGRAPHY:

A technology used for investigating and assessing soil, water, and soil gas contamination at a site. It is used for the analysis of VOCs and SVOCs. The technique identifies and quantifies organic compounds on the basis of molecular weight, characteristic fragmentation patterns, and retention time. Recent advances in gas chromatography that are considered innovative are portable, weather-proof units that have self-contained power supplies.

GENERATOR:

Any person whose process produces a hazardous waste in excess of 100 kg/month or acutely hazardous waste in excess of 1 Kg/month, or whose actions first cause a hazardous waste to become subject to regulation. A device that produces electricity for remote sites that are not accessible to standard electrical sources, usually petroleum fuel driven.

GEOLOGIST AND GEOPHYSICIST ACT:

California law requiring that any firm advertising geological services must have a registered professional as an officer of the corporation. Section 7838 of the Business and Professional Code.

 

GEOLOGY:

Science of the origin and structure of the earth, especially as evidenced by rocks and rock formations. The structure of the earth in a given region.

GEOLOGY:

Science of the origin and structure of the earth, especially as evidenced by rocks and rock formations. The structure of the earth in a given region.

GPD:

Gallons per day.

GPM:

Gallons per minute. 

GRAB SAMPLES:

A soil sample collected without the aid of a coring device. A water sample collected to observe physical characteristics.

GREENHOUSE GAS (GHG):

A gas trapping heat in the atmosphere.  Some greenhouse gases occur naturally and are emitted to the atmosphere through natural processes and human activities. Other greenhouse gases are created and emitted solely through human activities, contributing to global warming. 

GROUND-PENETRATING RADAR (GPR):

A technology that emits pulses of electromagnetic energy into the ground to measure its reflection and refraction by subsurface layers and other features, such as buried debris.

GROUNDWATER RECHARGE:

Refers to the addition to the water within the earth that occurs naturally from infiltration of rainfall and from water flowing over the earth materials that allow water to infiltrate below the land surface. 

GROUNDWATER:

Water beneath the land surface that flows through soil and rock openings of saturated geologic media.

GROUT:

A watery mixture of cement (and commonly bentonite) without aggregate that is used to seal the annular space around well casings to prevent infiltration of water or to short circuit vapor flow. Also called slurry.