PURPOSE: This rule defines terms used throughout the Treated Timber Law.

1. (1) American Wood Protection Association (AWPA)—Non-profit organization which is responsible for promulgating voluntary wood preservation standards.
2. (2) Chromated copper arsenate (CCA)— Waterborne wood preservative that is used for the treatment of utility poles, cross arms, pilings, fence posts, and highway structures. Use of this preservative for residential use was eliminated December 31, 2003.
3. (3) Copper azole—Waterborne wood preservative that was introduced into Missouri in 2004. Primary components of preservative are copper, tebuconazole, and propiconazole. Product is used in the treatment of decking, dimensional lumber, and landscape timbers.
4. (4) Copper naphthenate—Copper-based wood preservative that has a distinctive dark green color. Product is typically mixed with diesel fuel or P-9 oil and is used in treatment of utility poles, cross arms, landscape timbers, fence posts, rough sawn lumber, and highway structures.
5. (5) Core sample—Small, thin cylinder of wood created by increment boring and utilized to determine treatment levels in treated wood products.
6. (6) Creosote—Wood preservative distilled from coal tar. Product has a dark brown to black color with a characteristic odor and is used in the treatment of railroad ties, utility poles, and fence posts.
7. (7) End tag—Waterproof label that should be attached to all treated wood products sold to Missouri consumers. Label is required to possess information indicating the name and address of wood treater, what type of wood preservative is used, the level of treatment, and any other information required by the director.
8. (8) International Code Council Evaluation Service (ICC-ES)—Non-profit, public benefit corporation that performs technical evaluations of building products, components, methods, and materials including wood preservative systems.
9. (9) Penetration—Refers to the depth in which wood preservatives penetrate the wood after treatment. It is typically measured in inches.
10. (10) Pentachlorophenol—Wood preservative that is a synthetic chlorinated hydrocarbon. Product is typically mixed with diesel fuel or P-9 oil and is used in the treatment of utility poles, landscape timbers, fence posts, and rough sawn lumber.
11. (11) Regulatory sample—Core samples collected by a representative of the Missouri Department of Agriculture for the purpose of determining compliance with the treating standards associated with the Missouri Treated Timber Law.
12. (12) Retention—The amount of wood preservative retained in the outer zone of wood after treatment. It is typically measured in pounds per cubic foot (pcf) of wood.
13. (13) Service sample—Core or solution samples collected by a representative of the Missouri Department of Agriculture or other competent party approved by the Missouri Department of Agriculture for the purpose of determining retention, penetration, or solution concentrations. Information obtained from these types of samples has no impact on sample conformance rates of treating companies and is only intended for informational purposes.

AUTHORITY: section 280.050, RSMo 2000.* Original rule filed Aug. 27, 2008, effective March 30, 2009. *Original authority: 280.050, RSMo 1961, amended 1979, 1984, 1993, 1995.