Wood preservation facilites, pentachlorophenol thermal: chapter F, table 22

Table 22. Additional Recommended Operating Practices for Maintenance, Cleanout and Shutdown of Treatment Systems

Operation	Recommendations
Equipment maintenance	Check integrity of subsurface thermal tanks at least once every five years (cracks will be visible in cleaned tanks).
Cleanout	Objectives: To prevent accumulation of Pentachlorophenol (PCP) solutions and sludge within the treatment systems To ensure worker safety during cleanout operations
	Observe personnel safety precautions during all procedures (Tables 6 and 8 from this chapter and from chapter A). Routinely inspect sludge levels in storage tanks, mix tanks and treating tanks and clean out if necessary. Determine and specify sludge levels that require removal, in consultation with qualified technical personnel. Prior to entering tanks: Follow all standard precautions and safety procedures for vessel entry (as per provincial health and safety regulations). Thoroughly cool tanks. Do not enter treating tanks until they have cooled. If airborne concentrations are unknown, or are at or above Threshold Limit Value (TLVs), attendant must wear self-contained breathing apparatus, impermeable gloves, boots and disposable coveralls. If airborne concentrations are below TLVs, attendant must wear approved full face respirators, impermeable gloves, boots and disposable coveralls. Remove sludge with equipment used only for facility-related purposes. Thoroughly clean treatment tank interiors (as required) and test for structural integrity every 5 years