NR 710.17(5)(a)(a) Groundwater use. Groundwater use indicates the nature of the use made of groundwater within 3 miles of a substance of concern, including the geographical extent of the measurable concentration of the substance in the groundwater. Groundwater use values are shown in Table 18.
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NR 710.17(5)(b)
(b) Distance to wells and population. Distance to nearest well and population served have been combined in the matrix shown in Table 19 to reflect the important relationship between the distance of a population from substances of concern and size of the population served by groundwater that might be contaminated by those substances. To determine the overall value for this combined factor, score each factor individually as discussed in
pars. (c) and
(d). Match the individual values assigned with the values in the matrix for the total score.
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See PDF for table NR 710.17(5)(c)
(c) Distance to nearest well. Distance to nearest well is measured from the substance of concern to the nearest water supply well. If the actual distance to the nearest well is unknown, use the distance between the substance and the nearest occupied building not served by a public water supply. Distance values are shown in Table 20.
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See PDF for table NR 710.17(5)(d)
(d) Population served. Population served by groundwater is an indicator of the population at risk, which includes residents as well as others who would regularly use the water such as workers in factories or offices and students. Include employees in restaurants, motels, or campgrounds but exclude customers and travelers passing through the area in autos, buses or trains. If aerial photography is used, and residents are known to use groundwater, assume each dwelling unit has 2.8 residents. Where groundwater is used for irrigation, convert to population by assuming 1.5 persons per acre of irrigated land. The well or wells of concern must be within 3 miles of the substances, including the area of known groundwater contamination, but the "population served" need not be since water supplies may be distributed over a wider area. Likewise people within 3 miles who do not use water from the groundwater are not to be counted. Population values are contained in Table 21.
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History: Cr.
Register, April, 1994, No. 460, eff. 5-1-94.
NR 710.19(1)(1)
Observed release. Direct evidence of release to surface water, including wetlands, may be quantitative evidence that the facility or site is releasing contaminants into surface water or visual evidence of an active discharge which flows to a surface water. Quantitative evidence could be the measurement of levels of contaminants from a site or facility in surface water, either at the site or facility or downhill from it, that represents an increase over background levels. Visual evidence of a discharge must flow to a surface water which is readily identifiable in the field, from topographic maps, or from air photographs. If direct evidence of release has been obtained (regardless of frequency), enter a value of 45 on line 1 of the worksheet (Figure 5) and omit the evaluation of the route characteristics in
sub. (2) and containment factors in
sub. (3). If there is no direct evidence of release, enter a value of zero on line 1 and continue with the scoring procedure discussed in
sub. (2).
NR 710.19(2)(a)(a) Slope. Facility slope and intervening terrain are indicators of the potential for contaminated runoff or spills at a site or facility to be transported to surface water. The site or facility slope is an indicator of the potential for runoff or spills to leave the site or facility. Intervening terrain refers to the average slope of the shortest path which would be followed by runoff between the site or facility boundary and the nearest downhill surface water. The rating factor can be assessed using topographic maps. Table 22 shows values assigned to various facility conditions.
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(b) Runoff potential. Vegetative cover and surface soils at a site or facility are indicators of the potential of contaminated runoff or spills at a site or facility to be transported to a surface water. Table 23 shows the assigned values for runoff potential based on these 2 indicators.
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(c) Distance to surface water. Distance to the nearest surface water is the shortest distance from the substance of concern, not the facility or property boundary, to the nearest downhill body of surface water, such as a lake, stream or intermittent stream, to which runoff can be expected to flow. This factor indicates the potential for pollutants flowing overland and into surface water bodies. In areas of extreme topographic relief, the migratory distance is to be estimated, and that distance used for determining a value. Values for distance to surface water are shown in Table 24.
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(3) Containment. Containment is a measure of the means that have been taken to minimize the likelihood of a contaminant entering surface water either at the site or facility or beyond the site or facility boundary. Examples of containment are diversion structures and the use of sealed containers. If more than one type of containment is used at a site or facility, evaluate each separately using Table 25 and assign the highest score.
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(4) Waste characteristics. Evaluate waste characteristics for the surface water route with the procedures described in
s. NR 710.17 (4).
NR 710.19(5)(a)(a) Surface water. Surface water use brings into the rating process the use of the surface water downstream from the site or facility. The use or uses of interest are those associated with water taken from surface waters within a distance of 3 miles from the location of the hazardous substance. Use values are contained in Table 26.
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(b) Sensitive environments. Distance to sensitive environment refers to the distance from the substance of concern, not the site or facility boundary, to an area containing an important biological resource or to a fragile natural setting that could suffer an especially severe impact from pollution. Table 27 provides guidance on assigning a value to this rating factor.
NR 710.19(5)(c)
(c) Population. Population served by surface water with water intake within 3 miles downstream from the site or facility, or 1 mile in static surface water such as a lake, is a rough indicator of the potential hazard exposure of the nearby population served by potentially contaminated surface water. Measure the distance from the probable point of contaminant entry to surface water following the surface flow. The population includes residents as well as others who would regularly use the water such as workers in factories or offices and students. Include employees in restaurants, motels, or campgrounds but exclude customers and travelers passing through the area in autos, buses and trains. The distance is measured from the substance of concern, including observations in stream or sediment samples, regardless of site or facility boundaries. Where only residential houses can be counted (e.g., from an aerial photograph), and residents are known to be using surface water, assume 2.8 individuals per dwelling unit. Where surface water is used for irrigation, convert to population by assuming 1.5 persons per acre of land irrigated. Population values are shown in Table 28.
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See PDF for table NR 710.19 History
History: Cr.
Register, April, 1994, No. 460, eff. 5-1-94.
NR 710.21(1)
(1)
Observed release. The only acceptable evidence of release for the air route is data that show levels of a contaminant at or in the vicinity of the site or facility that significantly exceed background levels, regardless of the frequency of occurrence. If such evidence exists, enter a value of 45 on line one of the air route worksheet in Figure 6. If an observed release is scored, complete the analysis as described in
subs. (2) and
(3). If observed release is assigned a zero value, then Sa = 0, and no additional analysis is necessary. Record the date, location, and the sampling methods and procedures for monitoring data on the worksheet. Data based on transitory conditions due to facility disturbance by investigative personnel are not acceptable.
NR 710.21(2)(a)(a) General. The substance observed for scoring the release category may be different from the substance used to score waste characteristics.
NR 710.21(2)(b)1.1. Reactivity and incompatibility are measures of the potential for sudden release of concentrated air pollutants. These factors are evaluated independently, and the highest value for either is recorded on the worksheet.
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See PDF for table NR 710.21(2)(b)2.
2. Reactivity provides a measure of the fire or explosion threat at a facility. Assign a value based on the reactivity classification given in Table 29. Reactivity ratings for a number of common chemicals are given in Table 12.
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See PDF for table NR 710.21 Note
Note: The source of this table is
40 CFR part 300, Appendix A, Table 11; and is based on information taken from: National Fire Protection Association, National Fire Codes, Vol. 13, No. 49, 1977.
NR 710.21(2)(b)3.
3. Incompatibility provides a measure of the increased hazard when substances are mixed under uncontrolled conditions which may lead to production of heat, pressure, fire, explosion, violent reaction, toxic dusts, mists, fumes of gases, or flammable fumes or gases. Table 32 provides examples of incompatible combinations of materials. Incompatibility values are shown in Table 30.
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(c) Toxicity. Toxicity should be rated for the most toxic of the substances that can reasonably be expected to be transported away from the site or facility via the air route. Using the information given in Tables 12, 13 and 14
(s. NR 710.17 (4)), assign values as shown in Table 31.
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See PDF for table NR 710.21 Note
Note: The sources of this table is
40 CFR part 300, Appendix A, Table 12; and is based on information taken from: Hazardous Waste Management Law, Regulations, and Guidelines for the Handling of Hazardous Wastes, California Department of Health, February, 1975.
NR 710.21(3)(a)(a) Population. Population within a 4-mile radius is an indicator of the population which may be harmed should substances be released to the air. The distance is measured from the location of the substances, not from the site or facility boundary. The population to be counted includes persons residing within the 4-mile radius as well as transients such as workers in factories, offices, restaurants, motels or students. It excludes travelers passing through the area. If aerial photography is used in making the count, assume 2.8 individuals per dwelling unit. Select the highest value contained in Table 33 for this rating factor.
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(b) Sensitive environments. Distance to a sensitive environment is an indicator of the likelihood that a region that contains important biological resources or that is a fragile natural setting would suffer serious damage if substances were to be released from the site or facility. Assign a value from Table 27.
NR 710.21(3)(c)
(c) Land use. Land use indicates the nature and level of human activity in the vicinity of a site or facility. Assign highest applicable value from Table 34.
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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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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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(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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(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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History: Cr.
Register, April, 1994, No. 460, eff. 5-1-94.
