SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT
 
(Adopted June 1, 1990)(Amended December 7, 1990)
(Amended July 10, 1998)
 

RULE 1401. - NEW SOURCE REVIEW OF TOXIC AIR CONTAMINANTS

(a) Purpose
This rule specifies limits for maximum individual cancer risk (MICR), cancer burden, and noncancer acute and chronic hazard index (HI) from new permit units, relocations, or modifications to existing permit units which emit toxic air contaminants listed in Table I. The rule establishes allowable risks for permit units requiring new permits pursuant to Rules 201 or 203.

(b) Applicability

  1. Applications for new, relocated, and modified permit units which were received by the District on or after June 1, 1990 shall be subject to Rule 1401. Applications shall be subject to the version of Rule 1401 that is in effect at the time the application is deemed complete. Permit units installed without a required permit to construct shall be subject to this rule, if the application for a permit to operate such equipment was submitted after June 1, 1990.
  2. This rule shall apply to new, relocated, and modified permit equipment identified in Rule 219 as not requiring a written permit if the emissions from the equipment will be greater than the screening emissions levels contained within the procedures for determining health risks published pursuant to paragraph (e)(1).
(c) Definitions
  1. ACCEPTABLE STACK HEIGHT for a permit unit is defined as a stack height that does not exceed two and one half times the height of the permit unit or two and one half times the height of the building housing the permit unit, and shall not be greater than 65 meters (213 feet), unless the applicant demonstrates to the satisfaction of the Executive Officer that a greater height is necessary.
  2. BEST AVAILABLE CONTROL TECHNOLOGY FOR TOXICS (T-BACT) means the most stringent emissions limitation or control technique which:
    1. has been achieved in practice for such permit unit category or class of source; or
    2. is any other emissions limitation or control technique, including process and equipment changes of basic and control equipment, found by the Executive Officer to be technologically feasible for such class or category of sources, or for a specific source.
  3. CANCER BURDEN means the estimated increase in the occurrence of cancer cases in a population subject to a MICR of greater than or equal to one in one million (1.0 x 10-6) resulting from exposure to toxic air contaminants.
  4. CONTEMPORANEOUS RISK REDUCTION means any reduction in risk resulting from a decrease in emissions of toxic air contaminants at the facility that is permanent, real, quantifiable and enforceable through District permit conditions. Permit applications associated with the increase and decrease in risk must be submitted together and the reduction of risk must occur before the start of operation of the permit unit that will have an increased risk. A contemporaneous risk reduction shall be calculated based on the actual average annual emissions, as determined by facility records, and annual emissions declarations pursuant to Rule 301 as appropriate, or other data approved by the Executive Officer, whichever is less, which have occurred during the two-year period immediately preceding the date of application
  5. FACILITY means any permit unit or grouping of permit units or other air contaminant-emitting activities which are located on one or more contiguous properties within the District, in actual physical contact or separated solely by a public roadway or other public right-of-way, and are owned or operated by the same person (or by persons under common control), or an outer continental shelf (OCS) source as determined in 40 CFR Section 55.2. Such above-described groupings, if noncontiguous, but connected only by land carrying a pipeline, shall not be considered one facility. Notwithstanding the above, sources or installations involved in crude oil and gas production in Southern California Coastal or OCS Waters and transport of such crude oil and gas in Southern California Coastal or OCS Waters shall be included in the same facility which is under the same ownership or use entitlement as the crude oil and gas production facility on-shore.
  6. INDIVIDUAL SUBSTANCE ACUTE HAZARD INDEX (HI) is the ratio of the estimated maximum one-hour concentration of a toxic air contaminant for a potential maximally exposed individual to its acute reference exposure level.
  7. INDIVIDUAL SUBSTANCE CHRONIC HAZARD INDEX (HI) is the ratio of the estimated long-term level of exposure to a toxic air contaminant for a potential maximally exposed individual to its chronic reference exposure level. The chronic hazard index calculations shall include multipathway consideration, if applicable.
  8. MAXIMUM INDIVIDUAL CANCER RISK (MICR) is the estimated probability of a potential maximally exposed individual contracting cancer as a result of exposure to toxic air contaminants over a period of 70 years for residential and 46 years for worker receptor locations. The MICR calculations shall include multipathway consideration, if applicable.
  9. MODIFICATION means any physical change in, change in method of operation, or addition to an existing permit unit that requires an application for a permit to construct and/or operate. Routine maintenance and/or repair shall not be considered a physical change. A change in the method of operation of equipment, unless previously limited by an enforceable permit condition, shall not include:
    1. an increase in the production rate, unless such increase will cause the maximum design capacity of the equipment to be exceeded; or
    2. an increase in the hours of operation; or
    3. a change in ownership of a source; or
    4. a change in formulation of the materials processed which will not result in a net increase of the MICR, cancer burden, or chronic or acute HI from the associated permit unit.
    For facilities that have been issued a facility permit pursuant to Regulation XX or a Title V permit pursuant to Regulation XXX, modification means any physical change in, change in method of operation of, or addition to an existing individual article, machine, equipment or other contrivance which would have required an application for a permit to construct and/or operate, were the unit not covered under a facility permit or Title V permit.
  10. PERMIT UNIT means any article, machine, equipment, or other contrivance, or combination thereof, which may cause or control the issuance of air contaminants, and which requires a written permit pursuant to Rules 201 and/or 203. For facilities that have been issued a facility permit or Title V permit, a permit unit for the purpose of this rule means any individual article, machine, equipment or other contrivance which may cause or control the issuance of air contaminants and which would require a written permit pursuant to Rules 201 and/or 203 if it was not covered under a facility permit or Title V permit. For publicly-owned sewage treatment operations, each process within multi-process permit units at the facility shall be considered a separate permit unit for purposes of this rule.
  11. RECEPTOR LOCATION means
    1. for the purpose of calculating acute HI, any location outside the boundaries of the facility at which a person could experience acute exposure; and
    2. for the purpose of calculating chronic HI and MICR, any location outside the boundaries of the facility at which a person could experience chronic exposure.
    The Executive Officer shall consider the potential for exposure in determining whether the location will be considered a receptor location.
  12. RELOCATION means the removal of an existing permit unit from one parcel of land in the District and installation at another parcel of land where two parcels are not in actual physical contact and are not separated solely by a public roadway or other public right-of-way. The removal of a permit unit from one location within a facility and installation at another location within the facility is a relocation only if an increase in maximum individual cancer risk in excess of one in one million (1 x 10-6) or a Hazard Index of 1.0 occurs at any receptor location.
  13. TOTAL ACUTE HAZARD INDEX (HI) is the sum of the individual substance acute HIs for all toxic air contaminants affecting the same target organ system.
  14. TOTAL CHRONIC HAZARD INDEX (HI) is the sum of the individual substance chronic HIs for all toxic air contaminants affecting the same target organ system.
  15. TOXIC AIR CONTAMINANT is an air pollutant which may cause or contribute to an increase in mortality or serious illness, or which may pose a present or potential hazard to human health. For the purpose of this rule, toxic air contaminants are those listed in Table I.
(d) Requirements
The requirements of paragraphs (d)(2) and (d)(3) shall become effective September 8, 1998. The Executive Officer shall deny the permit to construct a new, relocated or modified permit unit if emissions of any toxic air contaminant listed in Table I may occur, unless the applicant has substantiated to the satisfaction of the Executive Officer all of the following:
  1. MICR and Cancer Burden

  2. The cumulative increase in MICR which is the sum of the calculated MICR values for all toxic air contaminants emitted from the new, relocated or modified permit unit and all other permit units located within a radius of 100 meters owned or operated by the applicant for which applications were submitted on or after June 1, 1990 will not result in any of the following:
    1. an increased MICR greater than one in one million (1.0 x 10-6) at any receptor location, if the permit unit is constructed without T-BACT;
    2. an increased MICR greater than ten in one million (1.0 x 10-5) at any receptor location, if the permit unit is constructed with T-BACT;
    3. a cancer burden greater than 0.5.
  3. Chronic Hazard Index

  4. The cumulative increase in total chronic HI, for all target organ systems, due to total emissions from the new, relocated or modified permit unit and all other permit units located within a radius of 100 meters owned or operated by the applicant for which complete applications were received on or after September 8, 1998 will not exceed 1.0 at any receptor location.
  5. Acute Hazard Index

  6. The cumulative increase in total acute HI, for all target organ systems, due to total emissions from the new, relocated or modified permit unit and all other permit units located within a radius of 100 meters owned or operated by the applicant for which complete applications were received on or after September 8, 1998 will not exceed 1.0 at any receptor location.
  7. Risk Per Year

  8. The risk per year shall not exceed 1/70 of the maximum allowable risk specified in (d)(1)(A) or (d)(1)(B) at any receptor locations in residential areas.

    If a permit contains operating conditions imposed pursuant to Rule 1401, which prohibit or limit the use or emission of toxic air contaminants, those conditions shall apply only to those toxic air contaminants listed in the version of Rule 1401 applicable at the time the permit conditions were imposed.

  9. Federal New Source Review for Toxics

  10. Pursuant to Section 112(g) of the federal Clean Air Act (CAA), no person shall begin construction or reconstruction of a major stationary source emitting hazardous air pollutants listed in Section 112 (b) of the CAA, unless the source is constructed with Best Available Control Technology for Toxics (T-BACT) and complies with all other applicable requirements, including definitions and public noticing, referenced in 40 CFR 63.40 through 63.44. The requirements of this paragraph shall not apply to:
    1. any source that is subject to an existing National Emission Standard for Hazardous Air Pollutants (NESHAP) pursuant to sections 112(d), 112(h), or 112(j) of the federal CAA;
    2. any source that is exempted from regulations under a NESHAP issued pursuant to sections 112(d), 112(h), or 112(j) of the federal CAA;
    3. any source that has received all necessary air quality permits for such construction or reconstruction before June 29, 1998;
    4. electric utility steam generating units, unless and until such time as these units are added to the source category list pursuant to the requirements of section 112(c)(5) of the federal CAA;
    5. any sources that are within a source category that has been deleted from the source category list pursuant to section 112(c)(9) of the federal CAA; or
    6. research and development activities.
  11. Compliance with this paragraph does not relieve any owner or operator of a major stationary source from complying with all other applicable District rules and regulations, including this rule, any applicable state airborne toxic control measure, or other applicable state and federal laws. Exemptions under subdivision (g) of this rule do not apply to this paragraph. This paragraph shall take effect retroactively from June 29, 1998.
(e) Risk Assessment Procedures
  1. The Executive Officer shall periodically publish procedures for determining health risks under this rule. To the extent possible, the procedures will be consistent with the policies and procedures of the state Office of Environmental Health Hazard Assessment (OEHHA).
  2. Within 150 days of risk values for compounds not in Table I being finalized by OEHHA, staff will bring proposed amendments to this rule to reflect changes to Table I.
  3. Within 150 days of risk values for compounds in Table I being updated by OEHHA, staff will:
    1. public a Notice of Intent to change risk values;
    2. perform an impact assessment, including socioeconomic effects; and
    3. submit a report to the District Governing Board with recommendations for changing the risk values in the procedures for determining risk assessment published pursuant to paragraph (e)(1).
  4. To calculate the cumulative increase in MICR pursuant to paragraph (d)(1), the increase from each permit unit shall be based on the emissions of toxic air contaminants, the risk values, and risk assessment procedures applicable at the time when each complete application was received by the District.
(f) Emissions Calculations
  1. For the purpose of determining MICR and cancer burden due to a new or relocated permit unit pursuant to this rule, the total Toxic Air Contaminant emissions from the new or relocated permit unit shall be calculated on an annual basis from permit conditions which directly limit the emissions or, when no such conditions are imposed, from:
    1. the maximum rated capacity;
    2. the maximum possible annual hours of operation;
    3. the maximum annual emissions; and
    4. the physical characteristics of the materials processed.
  2. For the purpose of determining chronic HI due to a new or relocated permit unit pursuant to this rule, the total emissions from a permit unit shall be calculated on an annual average basis from permit conditions which directly limit the emissions or, when no such conditions are imposed, from:
    1. the maximum rated capacity;
    2. the annual average hours of operation;
    3. the annual average emissions; and
    4. the physical characteristics of the materials processed.
  3. For the purpose of determining MICR, cancer burden and chronic HI due to a modified permit unit pursuant to this rule, the increase in emissions from the modified permit unit shall be calculated based on the difference between the total permitted emissions after the modification, calculated pursuant to the criteria established in subparagraphs (f)(1)(A), (B), (C), and (D), and:
    1. the total permitted emissions prior to the modification as stated in the permit conditions; or
    2. if there are no existing permit conditions that limit emissions, the average annual emissions which have occurred during the two-year period immediately preceding the date of the complete permit application for modification or other appropriate period determined by the Executive Officer to be representative of a permit unit's operation.
  4. For the purpose of determining acute HI due to a new, relocated or modified permit unit pursuant to this rule, the total emissions from a permit unit shall be calculated on a maximum hourly basis from permit conditions which directly limit the emissions or, when no such conditions exist, from:
    1. the maximum rated capacity;
    2. the maximum hourly emissions; and
    3. the physical characteristics of the materials processed.
  5. De Minimus Values

  6. Any permit unit with values at or below the screening levels as specified in the procedures for determining health risks under this rule, published pursuant to paragraph (e)(1), shall be deemed in compliance with the requirements of subdivision (d).
(g) Exemptions
  1. The requirements of subdivision (d) shall not apply to:
    1. Permit Renewal or Change of Ownership

    2. Any permit unit which is in continuous operation, without modification or change in operating conditions, for which a new permit to operate is required solely because of permit renewal or change of ownership.
    3. Modification with No Increase in Risk
    4. A modification of a permit unit that causes a reduction or no increase in the cancer burden, MICR or acute or chronic HI at any receptor location.
    5. Functionally Identical Replacement
    6. A permit unit replacing a functionally identical permit unit, provided there is no increase in maximum rating or increase in emissions of any toxic air contaminants. For replacement of dry cleaning permit units only, provided there is no increase in any toxic air contaminants.
    7. Equipment Previously Exempt Under Rule 219
    8. Equipment which previously did not require a written permit pursuant to Rule 219 that is no longer exempt, provided that the equipment was installed prior to the Rule 219 amendment eliminating the exemption and a complete application for the permit is received within one (1) year after the Rule 219 amendment removing the exemption.
    9. Modifications to Terminate Research Projects
    10. Modifications restoring the previous permit conditions of a permit unit, provided that: the applicant demonstrates that the previous permit conditions were modified solely for the purpose of installing innovative control equipment as part of a demonstration or investigation designed to advance the state of the art with regard to controlling emissions of toxic air contaminants; the emission reductions achieved by the demonstration project are not used for permitting any equipment with emission increases under the contemporaneous emission reduction exemption as specified in paragraph (g)(2); the demonstration project is completed within two (2) years; and a complete application is submitted no later than two (2) years after the date of issuance of the permit which modified the conditions of the previous permit for the purpose of the demonstration or investigation.
    11. Emergency Internal Combustion Engines
    12. Emergency internal combustion engines that are exempted under Rule 1304.
    13. Wood Product Stripping
    14. Wood product stripping permit units, provided that the risk increases due to emissions from the permit unit and all other permit units located within 100 meters owned or operated by the applicant for which complete applications were submitted on or after July 10, 1998 will not exceed a MICR of 100 in one million (1.0 x 10-4) or a total acute or chronic hazard index of five (5) at any receptor location. This exemption shall not apply to permit applications received after January 10, 2000, or sooner if the Executive Officer makes a determination that T-BACT is available to enable compliance with the requirements of paragraphs (d)(1), (d)(2) and (d)(3).
  2. Contemporaneous Risk Reduction
    1. The requirements of paragraphs (d)(1) and (d)(4) shall not apply if the applicant demonstrates that a contemporaneous risk reduction resulting in a decrease in emissions will occur such that both of the following conditions are met:
      1. no receptor location will experience a total increase in MICR of greater than one in one million (1.0 x 10-6) due to the cumulative impact of both the permit unit and the contemporaneous risk reduction; and
      2. the contemporaneous risk reduction occurs within 100 meters of the permit unit.
      T-BACT shall be used on permit units exempted under this subparagraph if the MICR from the permit unit exceeds one in one million (1.0 x 10-6).
    2. The requirements of paragraphs (d)(2) and (d)(3) shall not apply if the applicant substantiates to the satisfaction of the Executive Officer that a contemporaneous risk reduction will occur such that any increase in individual substance acute or chronic HI from the permit unit exceeding 1.0 is mitigated with an equal or greater decrease in the same individual substance acute or chronic HI, respectively, from the contemporaneous risk reduction such that both of the following conditions are met:
      1. no receptor location will experience an increase in total acute or chronic HI of more than 1.0 due to the cumulative impact of both the permit unit and the contemporaneous risk reduction; and
      2. the contemporaneous risk reduction occurs within 100 meters of the permit unit.
  3. Alternate Hazard Index Levels

  4. The requirements of paragraphs (d)(2) and (d)(3) shall not apply if the applicant substantiates to the satisfaction of the Executive Officer that at all receptor locations and for every target organ system, the total chronic and acute HI level resulting from emissions from the new, modified or relocated permit unit and all other permit units located within 100 meters owned or operated by the applicant for which applications were submitted on or after July 10, 1998 shall not exceed alternate HI levels which are determined by the Executive Office in consultation with the Office of Environmental Health Hazard Assessment to be protective against adverse health effects. No alternate HI level shall exceed 10.
    TABLE I   

    TOXIC AIR CONTAMINANTS 

    CAS #  SUBSTANCE  DATE OF LISTING 
    75-07-0  acetaldehyde  December 7, 1990 
    107-02-8  acrolein  September 8, 1998 
    79-06-1  acrylamide (or propenamide)  December 7, 1990 
    107-13-1  acrylonitrile (or vinyl cyanide)  December 7, 1990 
    7664-41-7  ammonia  September 8, 1998 
    7440-38-2   

    7784-42-1 

    arsenic and arsenic compounds (inorganic, including arsine) including, but not limited to:   
    arsenic compounds (inorganic)   
    arsine 
    December 7, 1990   
    September 8, 1998   
    September 8, 1998 
    1332-21-4  asbestos  June 1, 1990 
    71-43-2  benzene (including benzene from gasoline)  June 1, 1990 
    92-87-5  benzidine (and its salts)  December 7, 1990 
    100-44-7  benzyl chloride  September 8, 1998 
    7440-41-7  beryllium and beryllium compounds  December 7, 1990 
    111-44-4  bis(2-chloroethyl)ether (DCEE)  December 7, 1990 
    117-81-7  bis(2-ethylhexyl)phthalate (DEHP)  September 8, 1998 
    542-88-1  bis(chloromethyl)ether  December 7, 1990 
    7789-30-2  bromine pentafluoride  September 8, 1998 
    106-99-0  butadiene, 1,3-  December 7, 1990 
    7440-43-9  cadmium and cadmium compounds  June 1, 1990 
    56-23-5  carbon tetrachloride (or tetrachloromethane)  June 1, 1990 
    7782-50-5  chlorine  September 8, 1998 
    108-90-7  chlorobenzene  September 8, 1998 
    75-45-6   

    75-43-4   

    75-69-4   

    76-13-1 

    chlorofluorocarbons   

    chlorodifluoromethane (HCFC-22)   

    dichlorodifluoromethane (CFC-12)   

    trichlorofluoromethane (CFC-11)   

    trichlorotrifluoroethane (CFC-113) 

    September 8, 1998   

    September 8, 1998   

    September 8, 1998   

    September 8, 1998   

    September 8, 1998 

    67-66-3  chloroform  December 7, 1990 
    95-57-8   

    88-06-2   

    87-86-5 

    chlorophenols   

    chlorophenol, 2-   

    trichlorophenol, 2,4,6-   

    pentachlorophenol 

    September 8, 1998   

    September 8, 1998   

    December 7, 1990   

    September 8, 1998 

    76-06-2  chloropicrin  September 8, 1998 
    126-99-8  chloroprene  September 8, 1998 
    18540-29-9   

    10294-40-3   

    7758-97-6 

    chromium (hexavalent) and chromium compounds   

    including, but not limited to:   

    barium chromate   

    lead chromate 

    June 1, 1990   

    September 8, 1998   

    September 8, 1998 

    coke oven emissions  September 8, 1998 
    7440-50-8  copper and copper compounds  September 8, 1998 
    1319-77-3   

    08-39-4   

    95-48-7   

    106-44-5 

    cresols/cresylic acid (all isomers and mixture)   

    cresol, m-   

    cresol, o-   

    cresol, p- 

    September 8, 1998   

    September 8, 1998   

    September 8, 1998   

    September 8, 1998 

    1163-19-5  decabromodiphenyl oxide  September 8, 1998 
    924-16-3   

    621-64-7   

    55-18-5   

    62-75-9   

    10595-95-6 

    dialkylnitrosamines   

    nitrosodi-n-butylamine, n-   

    nitrosodi-n-propylamine, n-   

    nitrosodiethylamine, n-   

    nitrosodimethylamine, n-   

    nitrosomethylethylamine, n- 

    September 8, 1998   

    December 7, 1990   

    September 8, 1998   

    December 7, 1990   

    December 7, 1990   

    September 8, 1998 

    1746-01-6   

    1746-01-6   

    40321-76-4   

    39227-28-6   

    57653-85-7   

    19408-74-3   

    35822-46-9   

    3268-87-9   

    41903-57-5   

    36088-22-9   

    37871-00-4   

    34465-46-8 

    dibenzo-p-dioxins (chlorinated)   

    tetrachlorodibenzo-p-dioxin, 2,3,7,8-   

    pentachlorodibenzo-p-dioxin, 1,2,3,7,8-   

    hexachlorodibenzo-p-dioxin, 1,2,3,4,7,8-   

    hexachlorodibenzo-p-dioxin, 1,2,3,6,7,8-   

    hexachlorodibenzo-p-dioxin, 1,2,3,7,8,9-   

    heptachlorodibenzo-p-dioxin, 1,2,3,4,6,7,8-   

    octachlorodibenzo-p-dioxin, 1,2,3,4,5,6,7,8-   

    total tetrachlorodibenzo-p-dioxin   

    total pentachlorodibenzo-p-dioxin   

    total hexachlorodibenzo-p-dioxin   

    total heptachlorodibenzo-p-dioxin   

    total dioxins, with individual isomers reported   

    total dioxins, without individual isomers reported 

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990 

    51207-31-9   

    51207-31-9   

    57117-41-6   

    57117-31-4   

    70648-26-9   

    57117-44-9   

    72918-21-9   

    60851-34-5   

    67562-39-4   

    55673-89-7   

    39001-02-0   

    55722-27-5   

    30402-15-4   

    55684-94-1   

    38998-75-3 

    dibenzofurans (chlorinated)   

    tetrachlorodibenzofuran, 2,3,7,8-   

    pentachlorodibenzofuran, 1,2,3,7,8-   

    pentachlorodibenzofuran, 2,3,4,7,8-   

    hexachlorodibenzofuran, 1,2,3,4,7,8-   

    hexachlorodibenzofuran, 1,2,3,6,7,8-   

    hexachlorodibenzofuran, 1,2,3,7,8,9-   

    hexachlorodibenzofuran, 2,3,4,6,7,8-   

    heptachlorodibenzofuran, 1,2,3,4,6,7,8-   

    heptachlorodibenzofuran, 1,2,3,4,7,8,9-   

    octachlorodibenzofuran, 1,2,3,4,5,6,7,8   

    total tetrachlorodibenzofuran   

    total pentachlorodibenzofuran   

    total hexachlorodibenzofuran   

    total heptachlorodibenzofuran 

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990   

    June 1, 1990 

    96-12-8  dibromo-3-chloropropane, 1,2- (DBCP)  September 8, 1998 
    106-46-7  dichlorobenzene, p- (or 1,4-dichlorobenzene)  September 8, 1998 
    91-94-1  dichlorobenzidine, 3,3'-  December 7, 1990 
    72-55-9  dichlorodiphenyldichloroethylene (DDE)  September 8, 1998 
    25321-14-6   

    121-14-2 

    dinitrotoluenes (mixed isomers)   

    dinitrotoluene, 2,4- 

    September 8, 1998   

    December 7, 1990 

    123-91-1  dioxane, 1,4- (or 1,4-diethylene oxide)  December 7, 1990 
    106-89-8  epichlorohydrin (or 1-chloro-2,3-epoxypropane)  December 7, 1990 
    140-88-5  ethyl acrylate  September 8, 1998 
    75-00-3  ethyl chloride (or chlorethane)  September 8, 1998 
    106-93-4  ethylene dibromide (or 1,2-dibromoethane)  June 1, 1990 
    107-06-2  ethylene dichloride (or 1,2-dichloroethane)  June 1, 1990 
    75-21-8  ethylene oxide (or 1,2-epoxyethane)  June 1, 1990 
    50-00-0  formaldehyde  December 7, 1990 
    gasoline vapors  September 8, 1998 
    111-30-8  glutaraldehyde  September 8, 1998 
    111-76-2   

    110-80-5   

    111-15-9   

    109-86-4   

    110-49-6 

    glycol ethers (and their acetates)   

    including, but not limited to:   

    ethylene glycol butyl ether   

    ethylene glycol ethyl ether   

    ethylene glycol ethyl ether acetate   

    ethylene glycol methyl ether   

    ethylene glycol methyl ether acetate 

    September 8, 1998   

    September 8, 1998   

    September 8, 1998   

    September 8, 1998   

    September 8, 1998   

    September 8, 1998 

    118-74-1  hexachlorobenzene  December 7, 1990 
    608-73-1   

    319-84-6   

    319-85-7   

    58-89-9 

    hexachlorocyclohexanes (mixed or technical grade)   

    hexachlorocyclohexane, alpha-   

    hexachlorocyclohexane, beta-   

    hexachlorocyclohexane, gamma- (lindane) 

    December 7, 1990   

    December 7, 1990   

    September 8, 1998   

    September 8, 1998 

    77-47-4  hexachlorocyclopentadiene  September 8, 1998 
    302-01-2  hydrazine  September 8, 1998 
    122-66-7  hydrazobenzene (or 1,2-diphenylhydrazine)  December 7, 1990 
    7664-39-3  hydrofluoric acid (or hydrogen fluoride)  September 8, 1998 
    10035-10-6  hydrogen bromide  September 8, 1998 
    74-90-8  hydrogen cyanide  September 8, 1998 
    7783-06-4  hydrogen sulfide  September 8, 1998 
    624-83-9  isocyanates   

    methyl isocyanate   

    toluene diisocyanates 

    September 8, 1998   

    September 8, 1998   

    September 8, 1998 

    7439-92-1   

    301-04-2   

    7758-97-6   

    7446-27-7   

    1335-32-6 

    lead and lead compounds (inorganic, including elemental lead) including, but not limited to:   

    lead compounds (inorganic)   

    lead acetate   

    lead chromate   

    lead phosphate   

    lead subacetate 

    September 8, 1998   

    September 8, 1998   

    September 8, 1998   

    September 8, 1998   

    September 8, 1998   

    September 8, 1998 

    lead compounds (other than inorganic)  September 8, 1998 
    108-31-6  maleic anhydride  September 8, 1998 
    7439-96-5  manganese and manganese compounds  September 8, 1998 
    7439-97-6   

    7487-94-7   

    593-74-8 

    mercury and mercury compounds (inorganic)   

    including, but not limited to:   

    mercuric chloride   

    methyl mercury 

    September 8, 1998   

    September 8, 1998   

    September 8, 1998 

    67-56-1  methanol (methyl alcohol)  September 8, 1998 
    74-83-9  methyl bromide (or bromomethane)  September 8, 1998 
    71-55-6  methyl chloroform (or 1,1,1-trichloroethane)  September 8, 1998 
    80-62-6  methyl methacrylate  September 8, 1998 
    75-09-2  methylene chloride (or dichloromethane)  June 1, 1990 
    101-77-9  methylene dianiline, 4,4'- (and its dichloride)  September 8, 1998 
    12035-72-2  Nickel:   

    Subsulfide   

    refinery dust from the pyrometallurgical process 

    December 7, 1990   

    December 7, 1990 

    98-95-3  nitrobenzene  September 8, 1998 
    79-46-9  nitropropane, 2-  September 8, 1998 
    759-73-9  nitroso-n-ethylurea, n-  December 7, 1990 
    684-93-5  nitroso-n-methylurea, n-  December 7, 1990 
    86-30-6  nitrosodiphenylamine, n-  December 7, 1990 
    156-10-5  nitrosodiphenylamine, p-  September 8, 1998 
    930-55-2  nitrosopyrrolidine, n-  December 7, 1990 
    127-18-4  perchloroethylene (or tetrachloroethylene)  September 8, 1998 
    108-95-2  phenol  September 8, 1998 
    75-44-5  phosgene  September 8, 1998 
    7723-14-0   

    7803-51-2 

    phosphorus and phosphorus compounds   

    phosphine 

    September 8, 1998   

    September 8, 1998 

    85-44-9  phthalic anhydride  September 8, 1998 
    1336-36-3  polychlorinated biphenyls (PCBs)  December 7, 1990 
    56-55-3   

    50-32-8   

    205-99-2   

    207-08-9   

    218-01-9   

    53-70-3   

    193-39-5   

    91-20-3 

    polycyclic aromatic hydrocarbons (PAHs)   

    benz[a]anthracene   

    benzo[a]pyrene   

    benzo[b]fluoranthene   

    benzo[k]fluoranthene   

    chrysene   

    dibenz[a,h]anthracene   

    indeno[1,2,3-cd]pyrene   

    naphthalene   

    polycyclic aromatic hydrocarbons (PAHs), total 

    December 7, 1990   

    December 7, 1990   

    December 7, 1990   

    December 7, 1990   

    December 7, 1990   

    December 7, 1990   

    December 7, 1990   

    December 7, 1990   

    September 8, 1998   

    September 8, 1998 

    75-56-9  propylene oxide (or 1,2-epoxy propane)  September 8, 1998 
    7782-49-2  selenium and selenium compounds  September 8, 1998 
    100-42-5  styrene (or vinylbenzene)  September 8, 1998 
    108-88-3  toluene (or methyl benzene)  September 8, 1998 
    584-84-9   

    91-08-7 

    toluene diisocyanates   

    toluene-2,4-diisocyanate   

    toluene-2,6-diisocyanate 

    September 8, 1998   

    September 8, 1998   

    September 8, 1998 

    79-01-6  trichloroethylene  December 7, 1990 
    51-79-6  urethane (or ethyl carbamate)  September 8, 1998 
    75-01-4  vinyl chloride (or chloroethylene)  December 7, 1990 
    75-35-4  vinylidene chloride (or 1,1-dichloroethene)  September 8, 1998 
    1330-20-7   

    108-38-3   

    95-47-6   

    106-42-3 

    xylenes (isomers and mixture)   

    xylene, m-   

    xylene, o-   

    xylene, p- 

    September 8, 1998   

    September 8, 1998   

    September 8, 1998   

    September 8, 1998 

    7440-66-6   

    1314-13-2 

    zinc and zinc compounds   

    including, but not limited to:   

    zinc oxide 

    September 8, 1998   

    September 8, 1998

     
    TABLE II  

    TOXIC AIR CONTAMINANTS WITH PROPOSED RISK VALUES 

    CAS #  SUBSTANCE 
    60-35-5  acetamide 
    67-64-1  acetone 
    79-10-7  acrylic acid 
    107-05-1  allyl chloride 
    117-79-3  aminoanthraquinone, 2- 
    7783-20-2  ammonium sulfate 
    62-53-3  aniline 
    1309-64-4  antimony trioxide 
    arsenic compounds (other than inorganic) 
    205-82-3  benzo[j]fluoranthene 
    75-15-0  carbon disulfide 
    630-08-0  carbon monoxide 
    10049-04-4  chlorine dioxide 
    95-83-0  chloro-o-phenylenediamine, 4- 
    95-69-2  chloro-o-toluidine, p- 
    532-27-4  chloroacetophenone, 2- 
    75-45-6  chlorodifluoromethane (HCFC-22) 
    7440-48-4  cobalt and cobalt compounds 
    120-71-8  cresidine, p- 
    135-20-6  cupferron 
    615-05-4  diaminoanisole, 2,4- (sulfate) 
    95-80-7  diaminotoluene, 2,4- 
    226-36-8  dibenz[a,h]acridine 
    224-42-0  dibenz[a,j]acridine 
    192-65-4  dibenzo[a,e]pyrene 
    189-64-0  dibenzo[a,h]pyrene 
    189-55-9  dibenzo[a,i]pyrene 
    191-30-0  dibenzo[a,l]pyrene 
    194-59-2  dibenzo[c,g]carbazole, 7h- 
    75-34-3  dichloroethane, 1,1- 
    111-42-2  diethanolamine 
    68-12-2  dimethyl formamide 
    60-11-7  dimethylaminoazobenzene, p- 
    57-97-6  dimethylbenz[a]anthracene, 7,12- 
    42397-64-8  dinitropyrene, 1,6- 
    42397-65-9  dinitropyrene, 1,8- 
    106-88-7  epoxybutane, 1,2- 
    100-41-4  ethyl benzene 
    74-85-1  ethylene 
    107-21-1  ethylene glycol 
    96-45-7  ethylene thiourea 
    fluorides and fluoride compounds
     
    TABLE II (continued)  

    TOXIC AIR CONTAMINANTS WITH PROPOSED RISK VALUES 

    CAS #  SUBSTANCE 
    87-68-3  hexachlorobutadiene 
    67-72-1  hexachloroethane 
    822-06-0  hexamethylene-1,6-diisocyanate 
    110-54-3  hexane 
    78-59-1  isophorone 
    67-63-0  isopropyl alcohol 
    78-93-3  methyl ethyl ketone (or 2-butanone) 
    1634-04-4  methyl ter-butyl ether 
    56-49-5  methylcholanthrene, 3- 
    3697-24-3  methylchrysene, 5- 
    101-14-4  methylene bis(2-chloroaniline), 4,4- (MOCA) 
    101-68-8  methylene diphenyl diisocyanate 
    90-94-8  michler's ketone 
    7697-37-2  nitric acid 
    602-87-9  nitroacenaphthene, 5- 
    7496-02-8  nitrochrysene, 6- 
    607-57-8  nitrofluorene, 2- 
    5522-43-0  nitropyrene, 1- 
    57835-92-4  nitropyrene, 4- 
    156-10-5  nitrosodiphenylamine, p- 
    59-89-2  nitrosomorpholine, n- 
    100-75-4  nitrosopiperidine, n- 
    108171-26-2  paraffins, chlorinated (average chain length, c12; approx. 60% cl by weight) 
    7664-38-2  phosphoric acid 
    7758-01-2  potassium bromate 
    1120-71-4  propane sultone, 1,3- 
    115-07-1  propylene 
    107-98-2  propylene glycol methyl ether 
    7446-34-6  selenium sulfide 
    7440-22-4  silver and silver compounds 
    96-09-3  styrene oxide 
    7664-93-9  sulfuric acid 
    79-34-5  tetrachloroethane, 1,1,2,2- 
    62-55-5  thioacetamide 
    79-00-5  trichloroethane, 1,1,2- 
    121-44-8  triethylamine 
    1314-62-1  vanadium pentoxide 
    108-05-4  vinyl acetate 
    593-60-2  vinyl bromide