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Chapter 28

Chapter 28 . Hazardous Materials: Protective Actions. Introduction. There are general tactics when responding to a hazardous materials incident Tactical considerations provided are for general situations May not apply to specific cases

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Chapter 28

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  1. Chapter 28 Hazardous Materials: Protective Actions

  2. Introduction • There are general tactics when responding to a hazardous materials incident • Tactical considerations provided are for general situations • May not apply to specific cases • Firefighters beginning their training are unlikely to make evacuation decisions for several years • Material in this chapter should be kept in mind for the future

  3. Hazardous Materials Management Processes • Several different management processes exist • 8-Step Process • GEDAPER Process • DECIDE Process • Cores of all systems are basically the same: protection of life, property, environment • Group of responders will fit into the ICS using one of these processes, or a combination

  4. Table 28-1 Hazardous Materials Management Systems

  5. Isolation and Protection • One of the most important tasks • Methods: • Barrier tape • Use of law enforcement • Traffic barriers • Use of emergency vehicles to block access • Control incident quickly

  6. Figure 28-1 One of the first priorities should be to isolate the area so as to prevent other people from becoming involved with the incident.

  7. Rescue • Rescue of victims from suspected hazard area can be extremely controversial • Local protocol and SOPs must be considered • Evaluate incident • Take into account response and notification time • Once out of the area, decontaminate • Procedures should be in place for rescuing trapped victims

  8. Top 10 Chemicals Spilled • The top 10 chemicals spilled are: • Sulfuric acid • Hydrochloric acid • Chlorine • Ammonia • Sodium hydroxide • Gasoline • Propane

  9. Top 10 Chemicals Spilled (cont’d.) • The top 10 chemicals spilled are: (cont’d.) • Combustible liquids • Flammable liquids • Natural Gas • Response to an incident involving these chemicals should be no different than a response to a bedroom fire

  10. Site Management • Management of hazardous materials incident can be difficult • When involved in a chemical release, many agencies can be involved • Liaison must be established between all agencies • Requires a minimum of two safety officers • Hazardous materials safety officer should be trained to Technician or Specialist level

  11. Table 28-2 Hazardous Materials Branch Positions

  12. Establishment of Zones • Refers to areas that are established to identify various isolation points • Hot zone may be referred to as: • Exclusion zone • Isolation area • Hazard area • Warm zone: contamination reduction zone • Cold zone: support area

  13. Figure 28-7 The establishment of zones is usually based on the types of hazards that may be present. For general chemical spills, the zones established are referred to as the hot, warm, and cold zones.

  14. Figure 28-8 The best position for first responders is uphill and upwind from the release.

  15. Evacuations and Sheltering in Place • Best way to determine evacuation or shelter is to conduct real-time air monitoring • If a decision is made to evacuate, a suitable location needs to be found • In most cases, sheltering in place is safer than evacuation • When sheltering, citizens should shut all windows and doors • Shut off air handling systems

  16. Figure 28-9 Standard shapes for plumes or vapor clouds may form after a gas is released. The exact type varies with the topography and the buildings in the area.

  17. Common Incidents • Overview of common incidents • Types of releases in each DOT hazard class • Recommendations provided are only suggestions • Local policies and procedures should be followed

  18. Types of Releases • Type of release can be classified as: • Breach in a container • Release within containment system • Several ways of looking at potential release of a chemical: • Chemical is stressed • Container is stressed • Pressurized and non-pressurized containers can breach in several ways

  19. Figure 28-10 Types of container breaches.

  20. Figure 28-11 Propane tank detonation.

  21. Explosives • All persons must be removed from the area • Defensive operation should be established • Many other considerations come into play if fire is not directly impacting explosives • Examples of incidents involving explosives • Assisting a bomb squad • Shipment of explosives involved in an accident • Explosives brought by citizens to fire department

  22. Gases • Incidents involving gases include: • Flammable gases • Non-flammable gases • Many departments carry gas detection devices • Most commonly released flammable gases: • Natural gas • Propane • When fighting propane fire, large quantity of water is applied quickly and continuously

  23. Figure 28-19 Note the severe damage to this high pressure hydrogen tube trailer. It was involved in a traffic accident and caught fire. (Courtesy of Maryland Department Environment ERD) Figure 28-18 Master streams are used to cool the hydrogen tanks on a tube trailer. (Courtesy of Maryland Department Environment ERD)

  24. Flammable and Combustible Liquids • Leading category for most common type of release • Considerable runoff when fighting this type of fire • Problems when using foam • Damaging to environment • Slippery

  25. Figure 28-23 A diesel tank truck cab caught fire, impinging on the cargo tank. A quick and aggressive response by the Washington, DC, and Prince Georges County Fire Departments was able to knock down the fire before the contents were ignited. If the tank had become compromised, firefighting would have been very challenging because the tank truck was on a significant incline. Burning fuel would have traveled down the highway, possibly into storm drains. (Courtesy of Maryland Department Environment ERD)

  26. Flammable Solids, Water Reactives, and Spontaneously Combustible Materials • Specific identity and emergency response information are crucial • Responders have experience with flammable solids • Water-reactive group defined in two ways • Materials that are spontaneously combustible are kept stable during transport

  27. Figure 28-27 In this photo eight ounces of magnesium shavings were in a pool of burning diesel fuel. When the magnesium was heated, a slight water mist was sprayed over the fire. The white sparks are from the magnesium and the fireball is from the reaction as well. Relate the size of this violent reaction from a cup of magnesium to that of a truckload of magnesium.

  28. Oxidizers and Organic Peroxides • Can have explosive characteristics • Best known oxidizer is ammonium nitrate • Liquefied oxygen (LOX) presents more hazards in addition to supporting combustion • Pool chemicals are another common oxidizer

  29. Figure 28-28 A leak of liquid oxygen on asphalt can present a shock-sensitivity problem in addition to the increased risk of a fire.

  30. Poisons • Toxic in varying degrees but should be treated as poisonous by first responders • Most common incidents result from pesticides and agricultural chemicals • Commercial home fertilizers do not present much risk to responders • Unless in large quantities

  31. Radioactive Materials • Incidents are rare • Radioactive materials commonly used in community • Smoke detectors • Ground imaging equipment • Medical community • Follow the adage: • “Time, distance, and shielding”

  32. Corrosives • Most common incidents: • Sulfuric acid • Hydrochloric acid • Sodium hydroxide • Chemical protective clothing is required • Wash splashed material quickly • Chemical neutralization may be the best choice

  33. Figure 28-29 The shipping papers did not indicate the presence of nitric acid. The brown vapor cloud is a result of a chemical reaction between bromine and red fuming nitric acid. When the hazardous materials team opened the back of the truck, they were greeted with these vapors. The team members in the photograph retreated when the vapors were released from the back of the truck and changed into chemical protective clothing. (Courtesy of Maryland Department Environment ERD)

  34. Other Incidents • Impossible to outline each specific action that a first responder should take at a chemical release • Many toxic materials are odorless and colorless • Common incidents: • Sick buildings • Odor complaints • Gas leaks inside a building • Explosions caused by gas grills

  35. Decontamination • If first responder is expected to perform decontamination, then training is required • Decontamination is the physical removal of contaminants from: • People • Equipment • Environment

  36. Types of Decontamination • Four general types of decontamination levels: • Emergency decontamination • Technical decontamination • Mass decontamination • Fine decontamination • Process of decontamination is chemical specific

  37. Figure 28-31 One of the simplest forms of emergency decon is the use of a hoseline.

  38. Figure 28-33 Formal decontamination is used to remove any further contamination that may remain after gross decontamination.

  39. Figure 28-35B Once additional resources arrive then the advanced plan for mass decon can be implemented.

  40. Figure 28-40 An example of the decontamination vehicle completely set up. The use of the tent adds an additional layer of privacy. (Courtesy of Maryland Department Environment ERD)

  41. Decontamination Process • Several variations to decontamination process • Basic decontamination steps: • Tool drop • Gross decon • Scrubbing and rinse • PPE removal • SCBA removal • Clothing removal • Body wash and dry off • Medical evaluation, including rehydration

  42. Figure 28-36 Mass decon plan for herding mass numbers of potentially contaminated people.

  43. Methods of Decontamination • General methods of decontamination apply to: • Humans • Equipment • Environment • Consult with hazardous materials team or a chemist prior to using any method on a human

  44. Absorption • Spilled material picked up by absorbent material: • Ground-up newspaper • Clay • Kitty litter • Sawdust • Charcoal • Poly fiber • Compatibility needs to be researched prior to use

  45. Adsorption • Material to be picked up bonds to outside of adsorption medium: • Activated carbon • Sand • Many chemical facilities have activated carbon stored

  46. Chemical Degradation • Ability to degrade a chemical varies • Much like neutralization • To degrade a chemical: • Another chemical is added or • Chemical is exposed to the elements

  47. Dilution • Dependent on chemical structure of spilled material • With corrosive, large quantities of water are required

  48. Disinfection • With humans, a 0.5 percent bleach and water solution can be used for some etiological contaminants • Contact time is needed for success • Plain water has proven effective for biological contaminants

  49. Evaporization • Is allowing a chemical to evaporate changing its state of matter? • Solid or liquid left in the open will eventually change to vapor (depending on vapor pressure) • Chemical approaching boiling point will evaporate • Material does not disappear but merely changes its state of matter

  50. Isolation and Disposal • One of the easiest forms of decontamination • Isolate the contaminant, collect it using protective clothing, and then dispose of contaminant • Follow appropriate regulations

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