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12.0 Glossary

Vehicles Per Hour (VPH): Used for roadway volumes (counts or forecasts) and trip
generation estimates. Measures the number of vehicles in a one hour period, typically the
AM or PM peak hour.

Vernalis Adaptive Management Plan (VAMP): An agreement between multiple water
agencies to maintain targeted stream flows for 31 days each spring, typically mid-May
through mid-April. The purpose of VAMP is to help salmon smolt migrate downstream.

Very Low Income Household: A household with an annual income usually no greater than
50 percent of the area median family income adjusted by household size, as determined by
a survey of incomes conducted by a city or a county, or in the absence of such a survey, based
on the latest available eligibility limits established by the U.S. Department of Housing and
Urban Development (HUD) for the Section 8 housing program.

Vesting Tentative Tract Map: A map which meets the requirements of subdivision (a) and
Section 66452 of the California Government Code.

Vibration: Ground and structure oscillations due to low frequency sound-waves. Vibration
is measured either in Hertz (oscillations in pressure resulting from low frequency sound
waves) or in inches per second (physical motion of structures). Los Angeles County Code
prohibits the operation of any device that creates vibration velocity levels of more than 0.01
inch per second (in/sec) over the frequency range of 1 to 100 Hertz (Hz) at or beyond the
property boundary of the source if on private property, or at 150 feet from the source if on a
public space or public right-of-way.

View Corridor: The line of sight−identi ied as to height, width, and distance−of an observer
looking toward an object of significance to the community (e.g., ridgeline, river, historic
building, etc.); the route that directs the viewers’ attention.

Viewpoint: A location from which a site is visible; a specific location from which a view
perspective is taken.

Viewshed: The surface area that is visible from a given viewpoint or series of viewpoints. It
is also the area from which that viewpoint or series of viewpoints may be seen (a collection
of viewpoints). The viewshed aids in identifying the views that could be affected by the
proposed action. A viewshed is a broader perspective of a geographic area and incorporates
both close-range and long-range elements.

Volatile: Any substance that evaporates readily.

Volatile Organic Compound (VOC): Carbon-containing compounds that evaporate into the
air, except for specific exempt compounds found to be non-photochemically reactive and
thus not participating in smog formation. VOCs contribute to the formation of smog and/or
may themselves be toxic. VOCs often have an odor; some examples include gasoline, alcohol,
and solvents used in paints. VOC is synonymous with reactive organic gases and reactive
organic compounds.

R:\Projects\PAS\CEN\000306\Draft EIR\12.0_Glossary-051017.docx 12-87 Centennial Project
Draft EIR