NR 710.21 History
History: Cr.
Register, April, 1994, No. 460, eff. 5-1-94.
NR 710.23
NR 710.23
Computing the migration hazard mode score, SM. To compute SM complete the worksheet, Figure 7, using the groundwater score, Sgw, obtained using the instructions in
s. NR 710.17, the surface water score, Ssw, obtained using the instructions in
s. NR 710.19, and the air route score, Sa, obtained using the instructions in
s. NR 710.21.
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NR 710.23 History
History: Cr.
Register, April, 1994, No. 460, eff. 5-1-94.
NR 710.25(1)(1)
Notification. Compute a score for the fire and explosion hazard mode, SFE, when the local fire chief has provided written notice to the department that the site or facility presents a significant fire or explosion threat to the public or to a sensitive environment. SFE is also scored if there is a demonstrated fire or explosion threat based on field observations (e.g., combustible gas indicator readings). The threat must be documented to complete the worksheet for fire and explosion — Figure 8.
NR 710.25(2)
(2) Containment. Containment is an indicator of the measures that have been taken to minimize or prevent substances at the site or facility from catching fire or exploding. Normally, it will be given a value of 3 on the worksheet shown in Figure 8. If no substances that are individually ignitable or explosive are present and those that may be ignitable or explosive in combination are segregated and isolated so that they cannot come together to form incompatible mixtures, assign this factor a value of 1.
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See PDF for table NR 710.25(3)(a)(a) Evidence. Direct evidence of ignitability or explosion potential may exist in the form of measurements with appropriate instruments. If so, assign this factor a value of 3; if not, assign a value of 1.
NR 710.25(3)(b)
(b) Ignitability. Ignitability is an indicator of the threat of fire at a site or facility and the accompanying potential for release of air contaminants. Assign this rating factor a value based on the classification schemes shown in Table 35 and Table 36. Table 12 gives ignitability values for a number of common chemicals.
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See PDF for table NR 710.25 Note
Note: The source of this table is
40 CFR part 300, Appendix A, Table 13, and is based on information taken from: National Fire Protection Association,
National Fire Codes, Vol. 13, No. 49, 1977.
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See PDF for table NR 710.25(4)(a)(a) Distance to nearest population. Distance to nearest population is the distance from the hazardous substance to the nearest building or area in which one or more persons are likely to be located either for residential, educational, business, occupational or recreational purposes. It is an indicator of the potential for harm to humans from fire and explosion. The building or area need not be off-site. Distance values are shown in Table 37.
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See PDF for table NR 710.25(4)(b)
(b) Distance to nearest building. Distance to nearest building is an indicator of the potential for property damage as a result of fire or explosion. Values for distance to nearest building are shown in Table 38.
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See PDF for table NR 710.25(4)(c)
(c) Sensitive environments. Distance to nearest sensitive environment is measured from the substance of concern, not from the site or facility boundary. It is an indicator of potential harm to a sensitive environment from fire or explosion at the site or facility. Select the highest value using the information provided in Table 39, except assign a value of 3 where fire could be expected to spread to a sensitive environment even though that environment is more than 100 feet from the substance.
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See PDF for table NR 710.25(4)(e)
(e) Population at risk. Population within a 2-mile radius of the substance of concern, not from the site or facility boundary, is a rough indicator of the population at risk in the event of fire or explosion at a facility. The population to be counted includes those residing within the 2-mile radius as well as people regularly in the vicinity such as workers in factories, offices or students. It does not include travelers passing through the area. If aerial photography is used in making the count, assume 2.8 individuals per dwelling. This population factor is given a value from Table 40.
NR 710.25(4)(f)
(f) Buildings at risk. The number of buildings within a 2-mile radius from the property damage that could result from fire and explosion at a facility. Building values are shown in Table 41.
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See PDF for table NR 710.25 History
History: Cr.
Register, April, 1994, No. 460, eff. 5-1-94; correction in (4) (d) made under s. 13.93 (2m) (b) 7., Stats.,
Register, February, 2001, No. 542.
NR 710.27(1)(1)
Potential injury. The direct contact hazard mode refers to the potential for injury by direct contact with substances at the site or facility.
NR 710.27(2)
(2) Observed incident. If there is a confirmed instance in which contact with substances at the site or facility has caused injury, illness or death to humans, or domestic or wild animals, enter a value of 45 on line one of the worksheet shown in Figure 9 and proceed to line 4. Document the incident giving the date, location and pertinent details. If no such instance is known, enter "0" on line one and proceed to line 2.
NR 710.27(3)
(3) Accessibility. Accessibility to substances of concern refers to the measures taken to limit access by humans or animals to substances. Accessibility values are shown in Table 42.
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See PDF for table NR 710.27(4)
(4) Containment. Containment indicates whether the substances of concern are accessible to direct contact. For example, if a substance at the site or facility is in surface impoundments, containers (sealed or unsealed), piles, tanks or landfills with a cover depth of less than 2 feet, or has been spilled on the ground or other surfaces easily contacted such as the bottom of [a] shallow pond or creek, assign this rating factor a value of 15. Otherwise, assign a value of zero.
NR 710.27(6)(a)(a) Population. Population within one-mile radius is a rough indicator of the population that could be involved in direct contact incidents at an uncontrolled facility. Population values are shown in Table 43.
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(b) Habitats. Distance to a critical habitat of an endangered species is a rough measure of the probability of harm to members of an endangered species by direct contact with a substance of concern. Distance values are shown in Table 44.
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See PDF for table NR 710.27 History
History: Cr.
Register, April, 1994, No. 460, eff. 5-1-94.
