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12.0 Glossary

Circulation System: A network of transit, automobile, bicycle, and pedestrian rights-of-way
that connect origins and destinations.

Class I Landfill: Class I landfills may accept hazardous and non-hazardous wastes.

Class II Landfill: Class II landfills may accept “designated” and non-hazardous wastes.

Class III Landfill: Class III landfills may accept all non-hazardous wastes.

Clean Air Act (CAA): A federal law passed in 1970 and amended in 1977 and 1990 that sets
primary and secondary National Ambient Air Quality Standards for major air pollutants and
forms the basis for the national air pollution control effort.

Clean Water Act (CWA): The primary federal law in the United States governing water
pollution. The act established the goals of eliminating releases to water of high amounts of
toxic substances. The NPDES permit program is authorized by Section 402 of the CWA.

Clustered Development: Development in which a number of dwelling units are placed in
closer proximity than usual, or are attached, with the purpose of retaining an open space
area.

Code of Federal Regulations (CFR): The document that codifies all rules of the executive
departments and agencies of the federal government. It is divided into 50 volumes, known
as titles. Title 40 of the CFR (referenced as 40 CFR) lists all the environmental regulations.

Cohensionless Soil: A soil that when confined has little or no strength when air-dried, and
that has little or no cohesion when submerged.

Collapsible soil: Loose, dry, low-density soil that collapses and compacts under the addition
of water or excessive loading.

Collector: Relatively low speed (25–30 miles per hour [mph]), relatively low volume (5,000–
20,000 average daily trips) street that provides circulation within and between
neighborhoods. Collectors usually serve short trips and are intended for collecting trips from
local streets and distributing them to the arterial network.

Colloidal: Having the nature of a colloid, which is a system where finely divided particles are
dispersed within a continuous medium in a manner that prevents them from being filtered
easily or settled rapidly.

Colluvium: Loose bodies of sediment that have been deposited or built up at the bottom of
a low grade slope or against a barrier on that slope, transported by gravity.

Comfort Wise: Homes earning the Environmental Protection Agency’s Energy Star seal and
the Comfort Wise designation have been independently inspected and certified to
incorporate at least 30 percent energy savings in design and construction standards.

Commercial: A land use classification that permits facilities for the buying and selling of
commodities and services.

R:\Projects\PAS\CEN\000306\Draft EIR\12.0_Glossary-051017.docx 12-15 Centennial Project
Draft EIR