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12.0 Glossary

Reviewing Agencies: Local, State, and federal agencies with jurisdiction over the project
area or resources potentially affected by the project. Cities and counties are also considered
reviewing agencies.

Rezoning: An amendment to the map and/or text of a zoning ordinance to effect a change in
the nature, density, or intensity of uses allowed in a zoning district and/or on a designated
parcel or land area.

Rhyolite: A usually light-colored, fine-grained extrusive igneous rock that is compositionally
similar to granite.

Richter Scale: A logarithmic scale developed in 1935–1936 by Dr. Charles F. Richter and Dr.
Beno Gutenberg to measure earthquake magnitude by the amount of energy released, as
opposed to earthquake intensity as determined by local effects on people, structures, and
earth materials. A measure of the size or energy release of an earthquake at its source. The
scale is logarithmic; the wave amplitude of each number on the scale is ten times greater
than that of the previous whole number.

Rideshare: A travel mode other than driving alone, such as buses, rail transit, carpools, and
vanpools.

Ridgeline: A line connecting the highest points along a ridge and separating drainage basins
or small-scale drainage systems from one another.

Right-Lateral: Movement of a strike-slip fault where, if an observer were standing on one
side of the fault, the opposite side would move to the right.

Right-of-Way (ROW): That portion of property which is dedicated or over which an
easement is granted for public streets, utilities, or alleys.

Rilling: An erosion process which forms numerous small shallow channels.

Riparian Lands: Riparian lands are comprised of the vegetative and wildlife areas adjacent
to perennial and intermittent streams. Riparian areas are delineated by the existence of plant
species normally found near freshwater.

Rippability: A measure of an earthen material’s ability to be excavated with conventional
excavation equipment.

Risk Assessment: The qualitative and quantitative evaluation of the risk posed to human
health and/or the environment by the actual or potential presence and/or use of specific
pollutants.

Risk of Upset: The risk associated with potential explosions, fires, or release of hazardous
substances in the event of an accident or natural disaster.

Road Deck: The part of the bridge structure on which the road is constructed.

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Draft EIR