Wood preservation facilities, general recommendations: chapter A, table 14

Table 14. Recommended Design Features for Freshly Treated Wood Drip Areas (All Preservatives)

Objectives:

Minimize losses of preservative chemicals from treated wood to the environment by
- providing adequate controls to ensure minimization of preservative drippage prior to removal to unprotected storage areas; and
- controlling the generation and disposal of contaminated runoff waters.
  (For accelerated stabilization or fixation process, please refer to Table 15)

Design feature	Recommendations
National Fire Code ofCanada 2010	Refers to acceptable solutions in Division B, Section 5.4.
General design	Consider integrated design provisions for area that is sheltered from precipitation, dust, debris; efficient drip and runoff collection and containment; surface drainage and return of fluids to process with minimum dispersal from tracking by personnel and vehicles; adequate air flow to maintain preservative constituent levels in the air below regulated limits; and exhaust fans, ventilation fans, or water sprays to aid in air flow.
Drip area and containment	Provide a sufficiently sized and contained area to hold all freshly treated wood for the appropriate time for each preservative. Provide a roofed drip pad for waterborne preservative Provide impermeable and curbed charge unloading and drip areas, sloped to enable collection and storage of all runoff and infiltrating precipitation (for reuse or controlled discharge under terms of existing regulatory standards). Provide drip areas with either an impermeable top coating on floors and dykes/berms or a liner underneath.