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Comment: For dates of non-regulatory government publications, publications of recognized organizations and associations, federal rules, and federal statutory provisions reference in this rule, see paragraph 3745-104-01(C) of the Administrative Code titled “Incorporation by reference.”
(A) Endpoints. For analyses of offsite consequences, the following endpoints shall be used:
(1) Toxics. The toxic endpoints provided in appendix B of this rule.
(2) Flammables. The endpoints for flammables vary according to the scenarios studied:
(a) Explosion. An overpressure of one PSI.
(b) Radiant heat/exposure time. A radiant heat of five KW/M2 for forty seconds.
(c) Lower flammability limit. A lower flammability limit as provided in NFPA documents or other generally recognized sources.
(B) Wind speed/atmospheric stability class. For the worst-case release analysis, the owner or operator shall use a wind speed of 1.5 meters per second and F atmospheric stability class. If the owner or operator can demonstrate that local meteorological data applicable to the stationary source show a higher minimum wind speed or less stable atmosphere at all times during the previous three years, these minimums may be used. For analysis of alternative scenarios, the owner or operator may use the typical meteorological conditions for the stationary source.
(C) Ambient temperature/humidity. For worst-case release analysis of a regulated toxic substance, the owner or operator shall use the highest daily maximum temperature in the previous three years and average humidity for the site, based on temperature/humidity data gathered at the stationary source or at a local meteorological station; an owner or operator using the “RMP Offsite Consequence Analysis Guidance” may use twenty-five°C and fifty per cent humidity as values for these variables. For analysis of alternative scenarios, the owner or operator may use typical temperature/humidity data gathered at the stationary source or at a local meteorological station.
(D) Height of release. The worst-case release of a regulated toxic substance shall be analyzed assuming a ground level (zero feet) release. For an alternative scenario analysis of a regulated toxic substance, release height may be determined by the release scenario.
(E) The owner or operator shall use either urban or rural topography as applicable as defined in 40 CFR Part 51, appendix W: “Guideline on Air Quality Modeling, section 8.2.8 urban/rural classification.”
(F) Dense or neutrally buoyant gases. The owner or operator shall ensure that tables or models used for dispersion analysis of regulated toxic substances account for gas density.
(G) Temperature of released substance. For worst case, liquids other than gases liquified by refrigeration only shall be considered to be released at the highest daily maximum temperature, based on data for the previous three years appropriate for the stationary source, or at process temperature, whichever is higher. For alternative scenarios, substances may be considered to be released at a process or ambient temperature that is appropriate for the scenario.
Appendix B Table of Toxic Endpoints
CAS No. Chemical Name Toxic Endpoint (mg/L)
107-02-8 Acrolein [2-Propenal] 0.0011
107-13-1 Acrylonitrile [2-Propenenitrile] 0.076
814-68-6 Acrylyl chloride [2-Propenoyl chloride] 0.00090
107-18-6 Allyl alcohol [2-Propen-1-ol] 0.036
107-11-9 Allylamine [2-Propen-1-amine] 0.0032
7664-41-7 Ammonia (anhydrous) 0.14
7664-41-7 Ammonia (conc 20% or greater) 0.14
7784-34-1 Arsenous trichloride 0.010
7784-42-1 Arsine 0.0019
10294-34-5 Boron trichloride [Borane, trichloro-] 0.010
7637-07-2 Boron trifluoride [Borane, trifluoro-] 0.028
353-42-4 Boron trifluoride compound with methyl ether (1:1) [Boron, trifluoro[oxybis[methane]]-, T-4 0.023
7726-95-6 Bromine 0.0065
75-15-0 Carbon disulfide 0.16
7782-50-5 Chlorine 0.0087
10049-04-4 Chlorine dioxide [Chlorine oxide (CIO2)] 0.0028
67-66-3 Chloroform [Methane, trichloro-] 0.49
542-88-1 Chloromethyl ether [Methane, oxybis[chloro-] 0.00025
107-30-2 Chloromethyl methyl ether [Methane, chloromethoxy-] 0.0018
4170-30-3 Crotonaldehyde [2-Butenal] 0.029
123-73-9 Crotonaldehyde, (E)- [2-Butenal, (E)-] 0.029
506-77-4 Cyanogen chloride 0.030
108-91-8 Cyclohexylamine [Cyclohexanamine] 0.16
19287-45-7 Diborane 0.0011
75-78-5 Dimethyldichlorosilane [Silane, dichlorodimethyl-] 0.026
57-14-7 1,1-Dimethylhydrazine [Hydrazine, 1,1-dimethyl-] 0.012
106-89-8 Epichlorohydrin [Oxirane, (chloromethyl)-] 0.076
107-15-3 Ethylenediamine [1,2-Ethanediamine] 0.49
151-56-4 Ethyleneimine [Aziridine] 0.018
75-21-8 Ethylene oxide [Oxirane] 0.090
7782-41-4 Fluorine 0.0039
50-00-0 Formaldehyde (solution) 0.012
110-00-9 Furan 0.0012
302-01-2 Hydrazine 0.011
7647-01-0 Hydrochloric acid (conc 30% or greater) 0.030
74-90-8 Hydrocyanic acid 0.011
7647-01-0 Hydrogen chloride (anhydrous) [Hydrochloric acid] 0.030
7664-39-3 Hydrogen fluoride/Hydrofluoric acid (conc 50% or greater) [Hydrofluoric acid] 0.016
7783-07-5 Hydrogen selenide 0.00066
7783-06-4 Hydrogen sulfide 0.042
13463-40-6 Iron, pentacarbonyl- [Iron carbonyl (Fe(CO)5), (TB-5-11)-] 0.00044
78-82-0 Isobutyronitrile [Propanenitrile, 2-methyl-] 0.14
108-23-6 Isopropyl chloroformate [Carbonochloridic acid, 1-methylethyl ester] 0.10
126-98-7 Methacrylonitrile [2-Propenenitrile, 2-methyl-] 0.0027
74-87-3 Methyl chloride [Methane, chloro-] 0.82
79-22-1 Methyl chloroformate [Carbonochloridic acid, methylester] 0.0019
60-34-4 Methyl hydrazine [Hydrazine, methyl-] 0.0094
624-83-9 Methyl isocyanate [Methane, isocyanato-] 0.0012
74-93-1 Methyl mercaptan [Methanethiol] 0.049
556-64-9 Methyl thiocyanate [Thiocyanic acid, methyl ester] 0.085
75-79-6 Methyltrichlorosilane [Silane, trichloromethyl-] 0.018
13463-39-3 Nickel carbonyl 0.00067
7697-37-2 Nitric acid (conc 80% or greater) 0.026
10102-43-9 Nitric oxide [Nitrogen oxide (NO)] 0.031
8014-95-7 Oleum (Fuming Sulfuric acid) [Sulfuric acid, mixture with sulfur trioxide] 0.010
79-21-0 Peracetic acid [Ethaneperoxoic acid] 0.0045
594-42-3 Perchloromethylmercaptan [Methanesulfenyl chloride, trichloro-] 0.0076
75-44-5 Phosgene [Carbonic dichloride] 0.00081
7803-51-2 Phosphine 0.0035
10025-87-3 Phosphorus oxychloride [Phosphoryl chloride] 0.0030
7719-12-2 Phosphorus trichloride [Phosphorous trichloride] 0.028
110-89-4 Piperidine 0.022
107-12-0 Propionitrile [Propanenitrile] 0.0037
109-61-5 Propyl chloroformate [Carbonochloridic acid, propylester] 0.010
75-55-8 Propyleneimine [Aziridine, 2-methyl-] 0.12
75-56-9 Propylene oxide [Oxirane, methyl-] 0.59
7446-09-5 Sulfur dioxide (anhydrous) 0.0078
7783-60-0 Sulfur tetrafluoride [Sulfur fluoride (SF4), (T-4)-] 0.0092
7446-11-9 Sulfur trioxide 0.010
75-74-1 Tetramethyllead [Plumbane, tetramethyl-] 0.0040
509-14-8 Tetranitromethane [Methane, tetranitro-] 0.0040
7550-45-0 Titanium tetrachloride [Titanium chloride (TiCl4) (T-4)-] 0.020
584-84-9 Toluene 2,4-diisocyanate [Benzene, 2,4-diisocyanato-1-methyl-] 0.0070
91-08-7 Toluene 2,6-diisocyanate [Benzene, 1,3-diisocyanato-2-methyl-] 0.0070
26471-62-5 Toluene diisocyanate (unspecified isomer) [Benzene, 1,3-diisocyanatomethyl-] 0.0070
75-77-4 Trimethylchlorosilane [Silane, chlorotrimethyl-] 0.050
108-05-4 Vinyl acetate monomer [Acetic acid ethenyl ester] 0.26
Effective: 07/01/2005
R.C. 119.032 review dates: 03/07/2005 and 07/01/2010
Promulgated Under: 119.03
Statutory Authority: 3753.02
Rule Amplifies: 3753
Prior Effective Dates: 8/13/99