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12.0 Glossary

Off-Site Noise-Sensitive Receptor: Considered to be a single-family or multi-family
residence, school, convalescent or acute care hospital, park or recreation area, and/or
church.

Office of Environmental Health Hazard Assessment (OEHHA): A department within the
California Environmental Protection Agency that is responsible for evaluating chemicals for
adverse health impacts and establishing safe exposure levels. OEHHA also assists
in performing health risk assessments and developing risk assessment procedures for air
quality management purposes.

Office Use: The use of land by general business offices, medical and professional offices,
administrative or headquarters offices for large wholesaling or manufacturing operations,
and research and development.

Ohm-cm: In physics, ohm is a measure of resistivity. Resistivity is measured in ohm-
centimeters (cm).

Older Alluvium: Soil or sediments deposited by a previously existing river or other running
water. Alluvium is typically made up of a variety of materials, including fine particles of silt
and clay and larger particles of sand and gravel.

Open Space: Land that has been left in its natural state and has not been developed with
primary or accessory structures.

Open Space Element: One of the seven State-mandated elements of a local general plan. It
contains an inventory of privately and publicly owned open-space lands, and adopted goals,
policies, and implementation programs for the preservation, protection, and management of
open space lands.

Ordinance: A law or regulation set forth and adopted by a governmental authority, usually
a city or county.

Organic Compounds: A large group of chemical compounds containing mainly
carbon, hydrogen, nitrogen, and oxygen. All living organisms are made up of
organic compounds.

Outdoor Advertising Structure: Any device used or intended to direct attention to a
business, profession, commodity, service, or entertainment conducted, sold, or offered
elsewhere than upon the lot where such device is located.

Outdoor Recreation Use: A privately or publicly owned or operated use providing facilities
for outdoor recreation activities.

Outer Approach Zone: Airspace in which an air-traffic controller initiates radar monitoring
for incoming flights approaching an airport.

R:\Projects\PAS\CEN\000306\Draft EIR\12.0_Glossary-051017.docx 12-56 Centennial Project
Draft EIR