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12.0 Glossary

environmental impacts. The individual effects may be changes resulting from a single project
or a number of separate projects. The cumulative impact from several projects is the change
in the environment which results from the incremental impact of the project when added to
other closely related past, present, and reasonable foreseeable probable future projects.
Cumulative impacts can result from individually minor but collectively significant projects
taking place over a period of time (State CEQA Guidelines, Section 15355).

Cupule petroglyphs: Small abraded pits.

Cut: The excavation of a bank required to lower the natural ground line to the desired profile.

Day-Night Average Sound Level (Ldn): The A-weighted average sound level in decibels
during a 24-hour period with a 10 decibel (dB) weighing applied to nighttime sound levels
(10 PM to 7 AM). This exposure method is similar to the CNEL, but deletes the evening time
period (7 PM to 10 PM) as a separate factor.

Daytime Glare: Indirect reflected light generated on the Project site during the day. Sources
would primarily be generated by human activities and from the sun’s reflection off glass
windows of structures, automobiles, and trucks.

Debitage: Flakes and lithic waste.

Debris: Any organic material transported by storm water, including leaves, twigs, and grass
clippings.

Debris potential area zone: Zones, as delineated by County or regional authorities, that
yield similar volumes of sediment under similar conditions.

Decibel (dB): A unit for expressing the relative intensity (loudness) of sounds. The decibel
is the logarithm of the ratio of the intensity of a given sound to the faintest sound discernible
by the human ear.

Decibel, A-Weighted (dBA): The "A-weighted" scale for measuring sound in decibels;
weighs or reduces the effects of low and high frequencies in order to simulate human
hearing. Every increase of 10 dBA doubles the perceived loudness though the noise is
actually ten times more intense.

Decision Making Authority: Decision-making authority means any person or body vested
with the authority to make recommendations or act on application requests. The final
decision-making authority is the one which has the authority to act on a request by
approving or denying the request. This may include the Community Development Director
or his/her designee, Planning Commission, or the City Council.

Decision Making Body: Any person or group of people within a public agency permitted by
law to approve or disapprove the project at issue (State CEQA Guidelines, Section 15356).

Dedication: The turning over by an owner or developer of private land for public use, and
the acceptance of land for such use by the governmental agency having jurisdiction over the

R:\Projects\PAS\CEN\000306\Draft EIR\12.0_Glossary-051017.docx 12-20 Centennial Project
Draft EIR