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12.0 Glossary

scenic resources and access or direct views to areas or scenes of exceptional beauty or
historic or cultural interest. The aesthetic values of scenic routes often are protected and
enhanced by regulations governing the development of property or the placement of
outdoor advertising.

Scrubber: An air pollution control device that uses a high energy liquid spray to remove
aerosol and gaseous pollutants from an air stream. The gases are removed
either by absorption or chemical reaction.

Secondary Maximum Contaminant Level (SMCL): Standards set for public water systems
with respect to levels of contaminants that do not cause adverse health effects but can impact
the color and odor of water.

Secondary Treatment: Generally, a level of treatment that produces 85 percent removal
efficiencies for biological oxygen demand and suspended solids. Usually carried out through
the use of trickling filters or by the activated sludge process.

Section 106: Provision in National Historic Preservation Act that requires federal agencies
to consider effects of proposed undertakings on properties listed or eligible for listing in the
National Register of Historic Places.

Section 4(d): A section of the Federal Endangered Species Act (FESA) that allows special
rules to apply to a species listed as Threatened. Can specify the conditions allowing
incidental take.

Section 2081: A section of the California Endangered Species Act (CESA) that governs the
take of listed Endangered species.

Section 4(f): Provision in U.S. Department of Transportation Act that prohibits federal
approval or funding of transportation projects that require “use” of any historic site unless
(1) there is “no feasible and prudent alternative to the project” and (2) the project includes
“all possible planning to minimize harm”.

Section 10(a): A section of the federal ESA that governs issuance of a permit to allow
incidental take of a listed Endangered species.

Sediment: Organic or inorganic material that is carried by or is suspended in water and that
settles out to form deposits in the storm drain system or receiving waters.

Sedimentation: Process by which material suspended in water is deposited in a body of
water.

Seiche: A free or standing-wave oscillation of the surface of water in an enclosed or semi-
enclosed basin (such as a lake, bay, or harbor). It is generally caused by local changes in
atmospheric pressure, aided by winds, tidal currents and small earthquakes.

Seismic: Caused by or subject to earthquakes or earth vibrations.

R:\Projects\PAS\CEN\000306\Draft EIR\12.0_Glossary-051017.docx 12-70 Centennial Project
Draft EIR