Write the word TRUE if the statement is correct and FALSE if the statement is incorrect. 11. Control Hazards and Risks is where the assessment reveals a problem, preventive measures must be designed and implemented. 12. Threshold Limit Value (TLV) TLV is a measure of concentration of toxic substances. 13. Firefighting equipment must be available, located in specified area. you can include fire extinguishers, blankets, sand buckets and water hoses. 14. You should always check any equipment before use. 15. Switching off and unplugging all electrical appliances before leaving the workplace is a must.