Environmental recommendations for wood preservation facilities: glossary


Backflow preventer:

One way valve system that is installed on the water intake pipes of the facility to avoid cross-contamination due to reverse flow.

CEPA Toxic Substances:

A substance is toxic if it is entering or may enter the environment in a quantity or concentration or under conditions that:

  1. have or may have an immediate or long-term harmful effect on the environment or its biological diversity;
  2. constitute or may constitute a danger to the environment on which life depends; or
  3. constitute or may constitute a danger in Canada to human life or health (section 64 of CEPA).


All of the wood treated in one cylinder or treating tank at one time.

Check valve:

Check valve, is a mechanical device, a valve, which normally allows fluid, liquid or gas to flow through it in only one direction.


The facility refers to the entire treating operations including all buildings, equipment, structures and stationary items associated with treating that are owned or operated by the same company and that function as a single integrated site.


A physical and chemical process whereby a wood preservative system is rendered leach resistant in both water and soil applications in such a way that the active ingredient or ingredients maintain fungal/insecticidal efficacy. It is a binding chemical reaction with the wood cell wall and the active ingredient. Fixation only applies to CCA preservative.

Fixation chamber:

A containment chamber where the process of fixation is carried out.


Hydrogeology is the area of geology that deals with the distribution and movement of groundwater in the soil and rocks of the Earth's crust (commonly in aquifers).


Adjective relating to the sea or ocean. Refers exclusively to saltwater environments.


The Plant refers to the impregnation treatment area for one preservative which includes the cylinder(s) (retort), vats and/or open treating tanks, the chemical mixing area, the drip pad, the chemical storage area, the stabilization kiln and/or the accelerated fixation area.

Pesticide Label:

The Pesticide Label is a label that conveys information required by the Pest Control Products Act (PCPA), or its related regulations, to accompany a pest control product. This includes requirements for adherence to directions on application rates, personal protective equipment storage and disposal.


A natural or controlled process for reducing the moisture content of wood in preparation for treatment with a wood preservative.


A physical and chemical process whereby a wood preservative is rendered leach resistant (to a lesser degree than fixation) in both water and soil applications in such a way that the active ingredient or ingredients maintain fungal/insecticidal efficacy. The leaching resistance greatly vary depending on the pesticide, its application and the use of the treated products (contact with water).


Refers to any harmful effect of a chemical on an organism--including humans--or the environment. Organisms or the environment can be exposed to wood preservatives in three basic forms: as pure active ingredients, as formulations or as treated wood. Toxicity can cause effects in both the short (acute toxicity) and long term (chronic toxicity).

Wood Preservation Pollution Prevention Planning Notice:

Commonly named: Notice Requiring the Preparation and Implementation of Pollution Prevention Plans in Respect of Inorganic arsenic compounds, Hexavalent chromium compounds, Polychlorinated dibenzodioxins, Polychlorinated dibenzofurans and/or Hexachlorobenzene Used by Wood Preservation Facilities. (Canada Gazette, October 22, 2005).

Wood preservative:

A chemical or combination of chemicals for protecting wood against deterioration from decay, insects, marine borers, fire, weathering, absorption of water, and/or chemical action.

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