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12.0 Glossary

Perched Groundwater: Groundwater supported by a zone of material of low permeability
located above an underlying main body of groundwater with which it is not hydrostatically
connected.

Percolation: The downward movement of water through the soil or alluvium to the
groundwater table.

Performance Standards: Zoning regulations that permit uses based on a particular set of
standards of operation rather than on particular type of use. Performance standards provide
specific criteria limiting noise, air pollution, emissions, odors, vibration, dust, dirt, glare, heat,
fire hazards, wastes, traffic impacts, and visual impact of a use.

(Permanent) Open Space: The area which will be preserved as natural open space lots,
minor greenway lots, and landscape lots as identified on the VTTMs.

Permeability (soil): That quality of the soil or other geologic formations that enables it to
transmit water or air.

Permit: The possession of a permit issued by the city, or where no permits are issued, the
sanctioning of the activity by the jurisdiction as noted in a public record.

Permittees: The Permittees are the Los Angeles County cities and the County (collectively
“the Co-Permittees”).

Person: Person includes any person, firm, association, organization, partnership, business,
trust, corporation, limited liability company, company, district, city, county, city and county,
town, the State, and any of the agencies or political subdivisions of such entities (State CEQA
Guidelines, Section 15376).

Person Trips: Indicates the number of people, and are of interest in situations where there
may be opportunities to accomplish more one-person trips with less vehicle trips–such as a
carpool.

Pesticide: Any material used to control pests. Includes insecticides, herbicides, and
rodenticides.

Petroglyphs: Small abraded pits.

pH: A measure of acidity or alkalinity of a material, liquid, or solid. It is measured on a scale
of 0 to 14 with 7 representing a neutral state, 0 representing the most acid and 14 the
alkaline.

Photochemical Smog: The atmospheric condition that results when reactive organic gases
and nitrogen oxides emitted into the atmosphere react in the presence of sunlight to form
other pollutants, such as oxidants.

Photoionization Detector: A portable vapor and gas detector that detects a variety of
organic compounds.

R:\Projects\PAS\CEN\000306\Draft EIR\12.0_Glossary-051017.docx 12-60 Centennial Project
Draft EIR