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Identification and Hazard Assessment (IDHA) and Incident Action Plans: (I.A.P.). Spill Management vs. Decontamination. Spill Management - Internal Stop/Clean up the spill (if within capabilities) Decontamination - Internal or External Clean up the people.
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Stop/Clean up the spill
(if within capabilities)
Internal or External
Clean up the people
# in diamond 0 = No Hazard to 4 = Worst Hazard
The HARM form allows responders to make informed decisions about future actions.
Can we, with given resources, decon the victims?
Can we handle a small spill?
Do we say YES or NO?
What are our limits?
Toxicity – How long can I be exposed?
Flammability – How easily does it catch fire?
Solubility – What does it mix with?
Specific Gravity – Will it sink or float in water?
Vapor Density – Will it settle, stay or float away?
Vapor Pressure – How easily does it get into the air?
Corrosivity – Will it eat away at my suit?
Carcinogenic – Could it cause cancer in me?
As soon as the substance is identified, when possible.
Trained FRO’s or other persons familiar with SDS, NIOSH, etc. and the information needed for the form.
8. Exposure Controls/Personal Protection
Airborne Exposure Limits:
-OSHA Permissible ExposureLimit (PEL):
100 ppm (TWA) xylene
100 ppm (TWA) ethylbenzene
-ACGIH Threshold Limit Value (TLV):
xylene: 100 ppm (TWA) 150 ppm (STEL), A4 - Not classifiable as a human carcinogen.
ethyl benzene: 100 ppm (TWA) 125 ppm (STEL), A3 - Confirmed Animal Carcinogen with Unknown Relevance to Humans.
A system of local and/or general exhaust is recommended to keep employee exposures below the Airborne
Exposure Limits. Local exhaust ventilation is generally preferred because it can control the emissions of the
contaminant at its source, preventing dispersion of it into the general work area. Please refer to the ACGIH
document, Industrial Ventilation, A Manual of Recommended Practices, most recent edition, for details. Use
Personal Respirators (NIOSH Approved):
If the exposure limit is exceeded and engineering contro2l0s7 are not feasible, a half-face organic vapor respirator
Pg III A 101
Exposure values are also found in the General Information section of the MMG.
Pg III A 84
Floaters, Sinkers, Swimmers
Above / Upgrade Up Hill
Different Ventilation Up Wind
Out of flow Up Stream
Pg III A 63
Pg III A 67
Pg III A 75