ERPGs

Immediately Dangerous to Life and Health (IDLH). Not estabUshed foi acryhc acid value shown is the emergency response-planning guide-3 (ERPG-3) for exposure up to one hour without life-threatening effects. 

ERPG-l The maximum airborne concentration below which it is believed that nearly all individuals coiild be exposed for up to one hour without experiencing other than mild transient adverse health effects or perceiving a clearly defined objectionable odor. 

Probit models have been found generally useful to describe the effects of incident outcome cases on people or property for more complex risk analyses. At the other end of the sc e, the estimation of a distance within which the population would be exposed to a concentration of ERPG-2 or higher may be sufficient to describe the impact of a simple risk analysis. 

Measures of inhalation toxicity include ERPG, TLV, TLV-STEL, TLV-TWA, PEL, and IDLH. 

ERPG is defined in the section on hazard and risk analysis. 

Dispersion modeling of credible worse case scenarios indicates the one-hour exposure to nearest human receptor exceeds ERPG-2 level or equivalent. 

The results indicate that 2000 people will be exposed to a concentration of ammonia greater than the emergency response planning guideline concentration (e.g., ERPG-2). 

Number Exposed Above ERPG-2 FIGURE 9. Example of consequence analysis results. 

ERPG-1 Nothing other than mild transient adverse health effects or perception of a clearly defined objectionable odor... 

ERPG-2 No irreversible or other serious health effects or symptoms that could impair an individual s ability to take protective action... 

AIIIA Emergency Response Planning Guidelines (ERPGs) ERPG-1 ERPG-2 ERPG-3 0.1 ppm 30 ppm 100 ppm AIHA 1991... 

AIHA (American Industrial Hygiene Association). 1993. Emergency Response Planning Guideline (ERPG) for Arsine. Fairfax, VA AIHA. 

ERPGs are prepared by an industry task force and are published by the AIHA. Three concentration ranges are provided as a consequence of exposure to a specific substance ... 

ERPG data are shown in Table 5-6. To date, 47 ERPGs have been developed and are being reviewed, updated, and expanded by an AIHA peer review task force. Because of the comprehensive effort to develop acute toxicity values, ERPGs are becoming an acceptable industry/ government norm. 

Table 5-6 Emergency Response Planning Guidelines (ERPGs)1 (all values are in ppm unless otherwise noted) ...

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