MBUAPCD RULE 1000 PERM.GDLNS.& REQMTS.FOR SRCES.EMTNG.TAC'S                                           
LAST REVISED 03/25/86
                                           
                                 REGULATION X
                             TOXIC AIR CONTAMINANTS


        
  RULE 1000.  PERMIT  GUIDELINES AND REQUIREMENTS FOR SOURCES EMITTING TOXIC
              AIR CONTAMINANTS

              (Conceptual adoption 2-19-86; Final adoption 3-19-86.)

                                   CONTENTS

  PART  1.0.  GENERAL

        1.1.  Purpose
        1.2.  Applicability
        1.3.  Other Assessment Methods
        1.4.  Emissions Banking
        1.5.  Toxic Air Contaminant (TAC) Modeling
        1.6.  Violations
        1.7.  Appeal
        1.8.  Exemptions
  
  PART  2.0.  ASSUMPTIONS, DETERMINATIONS, AND THE USE OF DATA

        2.1.  Permit Evaluations
        2.2.  Emissions Determinations
        2.3.  Potency and Toxicity Determinations
        2.4.  Dose Response Relationships
        2.5.  Exposure Assessment

  PART  3.0.  DEFINITIONS

        3.1.  Best Control Technology (BCT)
        3.2.  Carcinogenic Toxic Air Contaminant (CTAC)
        3.3.  Carcinogenesis
        3.4.  Modification
        3.5.  Permissible Exposure Limit (PEL)
        3.6.  Pollutant Status Report (PSR)
        3.7.  Reasonable Control Technology (RCT)
        3.8.  Risk Assessment
        3.9.  Toxic Air Contaminant (TAC)
        3.10. Unit Risk Value (URV)

  PART  4.0.  REQUIREMENTS

        4.1. New or Modified Sources of Toxic  Air Contaminants (TACs) with
             Threshold Values
        4.2. Emissions  of  More  Than  One  Toxic  Air  Contaminant  (TAC)
        4.3. Exemption
        4.4. New   Or  Modified   Sources   of     Carcinogenic  Toxic  Air
             Contaminants       (CTACs)
        4.5. Permit Conditions


   PART 1.0. GENERAL


        1.1. Purpose.

        1.1.1.  To  prevent  to the maximum extent practicable  the emission 
        into the atmosphere  within  the  District of toxic air contaminants  
        (referenced  hereinafter  as TACs), which  may  cause  or contribute 
        to  an  increase  in mortality or an increase in serious illness, or 
        which  may  pose a present or potential hazard to human health; and,
        
        1.1.2.  To  prevent  occurrences  which  may endanger the health and 
        welfare  of  the  public  within the District and to assure  that no 
        person  will  suffer  material  impairment  of  health or functional 
        capacity.

        1.2. Applicability.

        1.2.1. This rule  applies to any new or modified stationary  sources  
        for  which Authority to  Construct  or Permit to Operate is required 
        pursuant  to District  Regulation  II  -  Permits, and which has the 
        potential  to emit  into  the atmosphere, by any means  and  in  any 
        quantity whatsoever, any toxic air contaminant (TAC).

        1.2.2.  It is the intent of this rule is to protect  to  the maximum 
        extent possible the public's  health  and  welfare  while  allowing,   
        where permitted, the continued  operation  of  sources  which  do or 
        may emit potential or actual toxic air contaminants (TACs).

        1.2.3. It  is  not the  intent  of  this  rule  to  limit in any way  
        the  provisions, extent,  intent, interpretation, or enforcement  of  
        District Rule 402 (Nuisances). 

        1.2.4.  Whenever  a  potential  toxic  air  contaminant (TAC) may be 
        subject  to  more  than  one  District  Rule,  or  to  more than one 
        requirement in this rule, the requirement  resulting  in  the  least 
        hazard to the public, as  determined  by  the  Air Pollution Control 
        Officer, shall apply.

        1.3. Other Assessment Methods.

        Where the  Air Pollution Control Officer determines  that reasonable
        information  or  lack of information indicates the public's interest 
        may be better protected by doing so:

        1.3.1. The Air Pollution Control Officer may require  for  any given 
        toxic  air  contaminant  (TAC)  source  and upon good cause shown, a  
        variation  in   any   step(s)  or  procedure(s)  of  the  toxic  air  
        contaminant  (TAC)  assessment methods required by this rule; and/or

        1.3.2.  The  Air  Pollution  Control  Officer   may   require  other 
        additional assessment  methods  deemed  appropriate  to assure  that  
        an  adequate  evaluation  on the subject toxic air contaminant (TAC) 
        emissions occurs.

        1.4. Emissions Banking.
        Banking of toxic air contaminant (TAC) emissions is prohibited.

        1.5. Toxic Air Contaminant (TAC) Modeling.

        1.5.1. For new or modified sources of toxic air contaminants (TACs),  
        the  appropriate  Environmental  Protection  Agency  approved  Users 
        Network for Applied Modeling of Air Pollutants series model shall be 
        used.

        1.5.2. For  new  and  modified  sources  of  carcinogenic  toxic air 
        contaminants   (CTACs),   the   Environmental   Protection    Agency  
        Industrial  Source  Complex  Short-Term  Model shall be utilized for 
        determining    carcinogenic    toxic    air   contaminants   (CTACs)  
        concentrations, unless the  Air  Pollution Control Officer approves, 
        in writing, an acceptable alternative.

        1.6. Violations.
        Each and  every violation  of  any  condition  of  a  permit  issued 
        in  accordance  with  this  regulation  is  a  separate and distinct 
        violation  of the District Rules and Regulations.
                     
        1.7. Appeal.

        1.7.1. Any final determination,  approval  or  denial  made  by  the 
        Air  Pollution  Control  Officer  in  the course of implementing the 
        requirements  of  this  rule,  including   any   permit   conditions 
        which  may   be  imposed  pursuant  hereto,  is  appealable  to  the  
        District Hearing Board  in accordance  with the procedures set forth 
        in  District  Regulation  VI  -  Procedure Before The Hearing Board.

        1.7.2.  Petitions  pertaining  to  Orders  of Abatement shall follow 
        procedures specified in Regulation VIII - Orders For Abatement.

        1.8. Exemptions.

        The   provisions  of  this  rule   shall  not  apply  to  facilities 
        dispensing gasoline  for  the  purposes  of  vehicle   fueling   and  
        dry  cleaning  operations.   Neither  shall the  provisions  of this 
        rule  apply  to any facility which uses, stores  or  transfers  less  
        than  five  gallons  per month  of  any  toxic air contaminant (TAC) 
        not defined as a  carcinogen pursuant to Section 3.2.

   PART 2.0. ASSUMPTIONS, DETERMINATIONS, AND THE USE OF DATA

        2.1. Permit Evaluations.
        In  addition  to  the  assumptions  specified  in  this  Part,  the 
        evaluation of a permit application performed  pursuant  to District 
        Rule 200  (Permits  Required)  for  a source emitting or having the  
        potential  to  emit toxic air  contaminants (TACs),  shall  utilize  
        realistically  conservative assumptions  in  those instances  where  
        data  is  either  lacking  or insufficient, in recognition that the 
        adverse  consequences  of  particular  carcinogens and/or  specific  
        toxic  air  contaminants  (TACs)  into  the  atmosphere  are as yet 
        largely undefined.

        2.2. Emissions Determinations.

        2.2.1. The determination of toxic  air  contaminant (TAC) emissions 
        and  related  ambient concentrations shall be performed  on a worst 
        case  basis  unless better data is provided and approved by the Air 
        Pollution Control Officer.

        2.2.2. Where  reliable  data  to  the contrary is not available, it 
        shall be assumed  that  the toxic air contaminant (TAC) in question 
        is introduced into the atmosphere in unaltered  form  continuously,  
        at  maximum  concentration   known  to   exist   at   the   source.    
        Where   reaction intermediates may  occur  or  process  events  are  
        indicated  that  are reasonably  documented,  those  will  be taken 
        into account.  The source evaluation required by this rule shall be  
        performed  and  impacts  summed  for  all  release  points  of  the 
        facility, for all  reaction intermediates, and  for  all  modes  of  
        environmental  entrainment  both  primary  and secondary.

        2.3. Potency and Toxicity Determinations.

        2.3.1.  Well   conducted   human   research,   including   positive  
        epidemiological  studies,  will  be  given greater weight than data 
        from other species.

        2.3.2.  Within  a  single  animal  species   bioassay  or  in  test 
        systems of varying sensitivity, data from the more sensitive sex or 
        animal species, as the case may be, shall be given greater weight.

        2.3.3. Where   decisive    empirical    evidence   is   absent   or  
        substantially    questionable,   the   following   scaling   factor 
        assumptions shall apply:

        2.3.3.1. In scaling from animal  to humans, the dosage units  shall  
        be  expressed  in mg/m3/day  using  a surface  area  correction  of  
        two-thirds (2/3) power of weight;
        2.3.3.2. The  degree  of  toxic air contaminant (TAC) absorption by 
        humans  is assumed to be at least equal to that of the experimental 
        species;
        2.3.3.3. Metabolic  and pharmacokinetic differences between species 
        will be considered only upon strong evidence; and,
        2.3.3.4. No  adjustment for inherent susceptability between species 
        will be assumed.

        2.3.4. The permissible exposure limit (PEL), as defined hereinafter  
        in  Section  3.5.,  shall  be  the  basic  measure  of the relative 
        toxicity  of  a pollutant.  Where other pertinent data, as approved 
        by the Air Pollution Control Officer, represents  the  toxicity  of 
        the  pollutant  in  question  more  accurately than the permissible 
        exposure  limit  (PEL),  such other data will be used.

        2.3.5. In conducting any  determinations pursuant to this Part, the  
        Air   Pollution   Control   Officer   shall    consult   with   the  
        California  Air  Resources Board and the State Department of Health 
        Services.


        2.4. Dose Response Relationships.

        2.4.1. For  the purposes of this rule, no threshold for carcinogens  
        is assumed, unless  otherwise approved by the Air Pollution Control 
        Officer upon findings  that  sufficient  reliable  evidence  exists  
        for  such determination.

        2.4.2. In  low  ranges of the  dose response  curve  of  the  toxic  
        air contaminant (TAC) for which  testing is generally not possible, 
        a  linear logorithmic extrapolation of positive  slope  is  assumed  
        based  on  the findings   at  the  higher  concentrations.   Unless  
        reliable data is presented which demonstrates  to  the satisfaction 
        of the Air Pollution Control  Officer that a different carcinogenic  
        mechanism  applies,  the  mechanism   for  carcinogenesis  used  to 
        describe the dose response curve in  the lower  range  shall be the 
        Multistage  Model  which  assumes  that  a  cell  may  go through a  
        sequence   of   specific   changes  (stages)  in  order  to  become 
        malignant.

        2.4.3. The use of a linearized 95 percent upper confidence level of 
        risk is required.

        2.4.4. For  the purposes  of  this rule, risk shall be estimated by 
        assuming that  the effective  dose of the new or modified source is 
        independent of the carcinogens in the background.


        2.5. Exposure Assessment.

        2.5.1. The  assessment of  risk shall be calculated at the point of 
        maximum  ground  level  impact  off  the facility property at which 
        point it shall be assumed human exposure occurs.

        2.5.2. The  human  exposure in  question is assumed to occur at the 
        point  of  maximum  ground level impact  for  70  continuous  years  
        with  regular or continuous exposure to the concentrations for that 
        entire period.

        2.5.3. Inside air is equivalent to outside air.


  PART  3.0. DEFINITIONS

        3.1. Best Control Technology (BCT).

        For any stationary source:

        3.1.1. The  most  effective  emission control device, or technique, 
        which  has  been  successfully  used  for  the  type  of  equipment 
        comprising  such  a stationary source, to control  the emission  of 
        carcinogenic toxic air contaminants (CTACs) and which is determined  
        by the Air Pollution  Control Officer to be cost-effective,  unless  
        the  applicant  demonstrates  to   the   satisfaction  of  the  Air
        Pollution  Control  Officer  that such limitations imposed on other 
        sources are not achievable.

        3.1.2. Under   no   circumstances  shall  best  control  technology  
        (BCT)  be  determined  to  be  less  stringent  than  the  emission 
        control required by  any other applicable  provision  of  District, 
        State,  or  federal  laws  or  regulations,  unless  the  applicant 
        demonstrates  to  the  satisfaction of the  Air  Pollution  Control  
        Officer  that  such  limitations  are  not achievable.

        3.2. Carcinogenic Toxic Air Contaminant (CTAC).

        3.2.1. Any  chemical  or  compound  shall  be  listed  by  the  Air 
        Pollution  Control  Officer   as   a  potential  carcinogenic toxic  
        air  contaminant (CTAC), if the following criteria are met:

        3.2.1.1. Sufficient  evidence  exists for carcinogenesis in animals
        demonstrating  positive  carcinogenesis  from   properly  conducted 
        bioassays   in   either  two  species  or  two  properly  conducted 
        bioassays  in  the  same laboratory or preferably, in two  separate  
        laboratories.  This in turn shall be deemed sufficient evidence for 
        potential human carcinogenesis.

        3.2.1.2. Sufficient    evidence    exists   in   animal   bioassays 
        demonstrating a statistically significant increase in the incidence 
        of  malignant  tumors or a decrease in the time of tumor formation.  
        Benign tumors may augment  the evidence for carcinogenesis provided 
        by malignant neoplasms.

        3.2.1.3. Where  evidence  conflicts  in  several  animal bioassays,  
        the  bioassay(s)  to  be utilized  shall be determined by  the  Air  
        Pollution Control Officer after consultation  with  the  California 
        Air  Resources  Board  and the State Department of Health Services.   
        The  determination  shall be  weighted on the positive and negative 
        results, the adequacy of the study design, the  appropriateness  of  
        the  species  tested,  the pharmacokinetics of the species, and the 
        statistical  power  of  the  test.  In   choosing  between  equally  
        weighted  evidence,  the positive  will be chosen over the negative 
        evidence, unless otherwise approved  by  the  Air Pollution Control 
        Officer.

        3.2.1.4. Properly  conducted  epidemiological studies may determine  
        that a substance will be  classified  as  potentially carcinogenic.  
        A  single   study   is  insufficient  for   compliance  with   this  
        criteria,  unless  otherwise  approved by the Air Pollution Control 
        Officer  and based on corroborating evidence from animal bioassays.

        3.2.1.5. Where   evidence    conflicts   between    epidemiological 
        studies,  the  study(s)  utilized  shall  be determined by the  Air  
        Pollution  Control  Officer based upon weighing  the  positive  and  
        negative results of the  studies, the adequacy of the study design, 
        length  of  follow-up,  adequacy   of   exposure  information,  and 
        statistical power.  In choosing  between equally weighted evidence, 
        the  positive  will  be  chosen over the negative evidence,  unless  
        otherwise  approved  by  the  Air  Pollution  Control Officer.

        3.2.2. For  the  purposes  of   this  rule,  a  list  of  potential 
        carcinogens determined  to meet the criteria set forth  in  section  
        3.2.  shall  be  developed  and  maintained  by  the  Air Pollution 
        Control Officer.  Said  list  shall  be  available  at the District  
        office  and  available  for inspection and/or copying upon request.

        3.2.3. Determinations  pursuant  to  this  section shall be made by 
        the  Air  Pollution  Control  Officer  in  consultation   with  the  
        California Air Resources Board and the State Department  of  Health  
        Services.  In  his  determination the Air Pollution Control Officer 
        shall be  guided by the International Agency for Research on Cancer 
        Monographs.


        3.3. Carcinogenesis.

        3.3.1. Carcinogenesis  is  defined as a self-replicating process in 
        which  a  change  induced  in  a  cell is transmitted to successive 
        generations of cells  descended  from it, including,  specifically,  
        cellular  changes  leading   to   the   formation   of   carcinomas 
        (malignant tumors of epithelial cells), garcomas  (malignant tumors  
        of   connective  tissue),  lymphomas,  leukemias  (cancers  of  the 
        lymphatic and blood systems).

        3.3.2. Carcinogenesis shall be quantified using "unit risk values".


        3.4. Modifications.


        A modification is defined as any alteration or process change which  
        may  result  in  a  net  increase  in  the  potential  to  emit any 
        toxic   air   contaminants   (TACs)   or   carcinogenic  toxic  air 
        contaminants (CTACs).


        3.5. Permissible Exposure Limit (PEL).
        Permissible  exposure  limit  (PEL) is  defined  as  a  work-shift,
        time-weighted  average  of  a  given  toxic  air  contaminant (TAC)
        concentration  established  for  airborne concentration  of a given 
        substance  which  provides  for  the  conditions  and amount of the 
        substance  to  which most workers  can  have  daily  exposure for a 
        working lifetime without suffering known adverse health affects.
                          
        The  permissible  exposure  limits  (PELs)  specified  in  Title  8
        California Administrative Code Section 5155 shall  be  used  unless
        otherwise specified by the Air Pollution Control Officer.


        3.6. Pollutant Status Report (PSR).

        Specifically  required  pursuant to this rule, the pollutant report 
        status (PSR) submitted to  the Air Pollution Control Officer  shall 
        include, but not be limited to, the following:
        3.6.1. A   written   assessment   of   and  a  description  of  any 
        modification  to  a  stationary   source,  including  equipment  or  
        operational   changes   and  modifications  which  may  affect  any 
        parameter of the application;
        3.6.2. An  itemization  and  written  evaluation  of the  viability  
        of substitute  compounds, processes,  and  other  procedures  which  
        may  be available to further reduce community risk;
        3.6.3. A review of current control technology developments; and,
        3.6.4. An  evaluation  of  the  adequacy of the applicable exposure 
        limits used.

        3.7. Reasonable Control Technology (RCT).

        3.7.1.  For  any  stationary source,  reasonable control technology 
        (RCT) is  defined  as  the  control  device or technique  which  is  
        readily  available  and  is  commonly  used  for  similar  types of 
        equipment, to  control  toxic air contaminants (TACs).

        3.7.2. If  the  applicant   demonstrates  to  the  satisfaction  of 
        the  Air Pollution  Control  Officer  that  the  controls specified 
        in Subsection 3.7.1. above are not reasonable, other technology may 
        be allowed.


        3.8. Risk Assessment.
        Risk  Assessment  is  defined  as the prediction  of adverse health 
        affects, including carcinogenesis, to the human individual  assumed  
        to be at the  point  of  maximum  ground  level impact on an annual 
        basis  of  a  source   emitting   specified   potential  toxic  air 
        contaminants (TACs) through the  use  of:   hazard  identification;  
        dose   response   assessment;   exposure   assessment   and    risk 
        characterization.

        3.8.1. A  risk  assessment  shall  include  pollutant  cross  media 
        transfer and, additionally, shall address the factors specified  in  
        Health  & Safety Code Section 39665(b).

        3.8.2. In  those  instances  where  the  operation   or   potential 
        operation of a facility  emitting  toxic  air  contaminants  (TACs)  
        will  also  lessen  population  exposure elsewhere in the District, 
        assessment of risk shall include those data.


        3.9. Toxic Air Contaminant (TAC).

        A  toxic  air  contaminant  (TAC)  is  defined  as   any  substance 
        with  the  potential  to  contaminate  the  air  or  to  create air 
        contaminants, which:
        3.9.1. Based on reasonable scientific information in the  judgement 
        of  the Air Pollution Control Officer may cause or contribute to  a 
        recognizable  increase  in  mortality,  morbidity, or may otherwise 
        pose a present  or potential material impairment  to  human  health 
        or functional capacity,  and is listed in Title 8 of the California  
        Administrative Code, Section 5155; or
        3.9.2. Is  determined by the Air Pollution Control Officer to  meet  
        the criteria set forth in Section 3.2.


        3.10. Unit Risk Value (URV).
        Unit risk value (URV) is the quantitative  estimate of carcinogenic
        potency expressed as the chance of contacting cancer from a 70-year
        lifetime  exposure  to  a  concentration  of  1 ug/m3  of  a  given 
        substance. 
                       
        The  unit  risk  value (URV)  represents  the  probability of cancer 
        cases, not deaths.

        
  PART  4.0. REQUIREMENTS

        4.1. New  or  Modified  Sources of Toxic  Air  Contaminants   (TACs)
             with Threshold Values.

        4.1.1. New or modified  sources  emitting or having the potential to  
        emit noncarcinogenic toxic air  contaminants  (TACs)  with threshold 
        values shall install reasonable control technology (RCT), as defined 
        in Section 3.7., prior to operation.

        4.1.2. In   no  event  shall  emissions  impact  of  any  toxic  air 
        contaminant  (TAC)  in  any  one  hour  period exceed 1/420th of the 
        current permissible exposure  limit  (PEL),  as  defined  in Section 
        3.5., calculated on a worst case basis  as  measured  or  calculated  beyond  the facility 
        property line.  This standard may be revised on a pollutant-specific 
        basis  by  the  Air  Pollution  Control  Officer based on   reliable 
        scientific data.

        4.1.3. New or modified sources of toxic air  contaminants (TACs) to 
        which this Part applies, shall  submit  a  pollutant status  report  
        (PSR) as defined in Section 3.6.  with  an  Authority  to Construct 
        and  Permit  to  Operate  application pursuant to Rule 200 (Permits 
        Required).


        4.2. Emissions of More Than One Toxic Air Contaminant (TAC).

        Where  there  is more than one emitted or potentially  emitted toxic  
        air  contaminant  (TAC)  for   which   the   Air  Pollution  Control  
        Officer  determines  the  existence  of  significant similarities in   
        physiological  manifestation, chemical  structure,  or  where  there  
        is  evidence  of  interaction,  these  pollutants shall  be  treated  
        and  analyzed  in  an  additive  fashion.  Emissions  of this nature 
        shall be evaluated by the most stringent permissible exposure  limit 
        (PEL)  [see Section 3.5.] of the defined toxic air contaminant (TAC) 
        mix [see Section 3.9.]  for  the  sum  of the toxic air contaminants 
        (TACs) in question.


        4.3. Exemption.
        The  Air  Pollution  Control  Officer  may  exempt a  subject source 
        from  Subsection  4.1.3.  if   the  Air  Pollution  Control  Officer  
        determines  sufficient information exists to adequately characterize  
        and  evaluate the toxic air contaminant (TAC) emissions.


        4.4. New  Or Modified Sources of Carcinogenic Toxic Air Contaminants
             (CTACs).
        New or modified sources emitting, or having  the  potential to emit,
        carcinogenic   toxic  air  contaminants  (CTACs),  shall  meet   the  
        following requirements.

        4.4.1. Best  control  technology  (BCT),  as defined in Section 3.1, 
        shall be installed and operational on all  sources  of  carcinogenic  
        toxic air contaminants (CTACs) prior to operation.

        4.4.2. Estimated  emissions from  the  subject  facility  shall  not  
        be  anticipated  to  cause  a  net  risk  in  excess  of  one cancer 
        incidence   per   1 x 105  population   as  estimated  in   a   risk  
        assessment conducted pursuant to Section 3.8.

        4.4.3. In  no event shall emissions impact of any carcinogenic toxic 
        air contaminant (CTAC) in  any one hour period exceed 1/420th of the 
        current permissible exposure limit (PEL), as defined in Section 3.5., 
        calculated on a worst case basis beyond the  facility  property line.  
        This factor may  be  revised  on  a pollutant-specific basis by  the  
        Air  Pollution Control Officer based on reliable scientific data.

        4.4.4. A  Risk  Assessment,  as  defined  in  Section 3.8, shall  be 
        conducted  and  submitted  to the Air Pollution Control  Officer  as  
        part  of  the  Authority  to  Construct  permit application required 
        pursuant to Rule 200 (Permits Required), verifying  compliance  with  
        Subsection 4.4.2. above unless exempted by the Air Pollution Control 
        Officer.   When  more  than  one  potential  carcinogenic  toxic air 
        contaminant  (CTAC)  is  emitted,   the  risk  assessment  shall  be 
        performed based on the additive impact of the carcinogenic toxic air 
        contaminants (CTACs).

        4.4.5. A pollutant status report (PSR),  as defined in Section 3.6., 
        shall be proposed,  submitted and approved to  the  satisfaction  of  
        the  Air  Pollution  Control  Officer  as  part  of the Authority to 
        Construct  permit application required pursuant to Rule 200 (Permits 
        Required). 
        4.4.6. The  pollutant  status report (PSR)  required  in  accordance  
        with Subsection  4.4.5. above,  shall  be  updated  and submitted to 
        the  Air  Pollution  Control  Officer  by   the  permit  anniversary  
        date   of   each  successive  fifth  year  of  the  issuance of  the  
        Authority  to   Construct  permit  pursuant  to  Rule  200  (Permits 
        Required).

        4.5. Permit Conditions.

        All significant  parameters  of the application shall be a condition 
        of the issuance of the permit. These include all data upon which the 
        risk  assessment  is  performed.  Any significant  change  of  these 
        conditions may cause a reevaluation of the permit or be considered a 
        violation of these rules and regulations.


                                        * * * * *


        RULE 1000 ATTACHMENT: 

        Listing of Carcinogenic Toxic Air Contaminants
        (CTACs) and Toxic Air Contaminants (TACs)



        A.  Administrative   List  of  Carcinogenic  Toxic  Air Contaminants 
            (CTACs),  determined  pursuant  to  and for the purposes of Rule  
            1000,  Subsection 3.2.2.


                       o Acrylonitrile
                       o Arsenic
                       o Asbestos
                       o Benzene
                       o Beryllium
                       o Cadmium
                       o Carbon Tetrachloride
                       o Chloroform
                       o Chromium VI
                       o 1-4 Dioxane
                       o Dioxins
                       o Epichlorohydrin
                       o Ethylene Dibromide
                       o Ethylene Dichloride
                       o Ethylene Oxide
                       o Formaldehyde
                       o Lead
                       o Methylene Chloride
                       o Nickel
                       o Nitrosomorpholine
                       o Perchloroethylene
                       o Polychlorinated Biphenyls (PCBs)
                       o Vinyl Chloride

        B.  Administrative  List  of  Toxic  Air  Contaminants  (TACs), 
            determined pursuant to and for the purposes of Rule 1000, 
            Subsection 3.9.1.



                       Chemical
                       Abstract
                       Registry No.          Pollutant

                      75070   ACETALDEHYDE
                     108247   ACETIC ANHYDRIDE
                      67641   ACETONE
                      75058   ACETONITRILE
                     107028   ACROLEIN
                      79061   ACRYLAMIDE
                      79107   ACRYLIC ACID
                     107131   ACRYLONITRILE
                     107051   ALLYL CHLORIDE
                      62533   ANILINE
                   29191524   ANISIDINE
                    1327339   ANTIMONY and ANTIMONY TRIOXIDE
                      ---     ARSENIC, organic compounds
                    7784421   ARSINE, AsH

                    7440393   BARIUM
                      71432   BENZENE
                     100447   BENZYL CHLORIDE (alphachlorotoluene)
                     ---      BERYLLIUM and beryllium compounds
                      92524   BIPHENYL (diphenyl phenylbenzene)
                    7726956   BROMINE
                     109795   1-BUTANETHIOL (Butyl mercaptan)
                     123864   n-BUTYL ACETATE
                      71363   n-BUTYL ALCOHOL (1-butanol)
                     109739   BUTYLAMINE

                              CADMIUM
                    7440439    metal dust
                      72150    soluble salts
                      56235   CARBON TETRACHLORIDE
                    7782505   CHLORINE
                   10049044   CHLORINE DIOXIDE
                     532274   alpha-CHLOROACETOPHENONE (phenacyl chloride)
                     108907   CHLOROBENZENE (monochlorobenzene)
                              CHLORODIPHENYL
                   53449219    (42% chlorine) (PCB)
                   11097691    (54% chlorine) (PCB)
                      67663   CHLOROFORM (trichloromethane)
                      74873   CHLOROMETHANE (Methyl Chloride)
                     542881   bis-CHLOROMETHYL ETHER
                    7440473   CHROMIUM metal
                               (II)  compounds, as CR
                               (III) compounds, as CR
                               (VI)  compounds, as CR
                    7440484   COBALT
                     420042   CYANAMIDE
                      57125   CYANIDE, as CN
                     460195   CYANOGEN
                     110827   CYCLOHEXANE

                     334883   DIAZOMETHANE
                      95501   o-DICHLOROBENZENE
                      75343   1,1-DICHLOROETHANE
                      84662   DIETHYL PHTHALATE
                      57147   1,1-DIMETHYLHYDRAZINE
                      77781   DIMETHYL SULFATE (methyl sulfate)
                     123911   p-DIOXANE
                               (1,4-dioxacycyclohexane,
                                1,4-diethylene dioxide)

                      75081   ETHANETHIOL (ethyl mercaptan)
                     141435   ETHANOLAMINE (2-aminoethanol)
                     110805   2-ETHOXYETHANOL (Cellosolve)
                     141786   ETHYL ACETATE
                      64175   ETHYL ALCOHOL (ethanol)
                     100414   ETHYLBENZENE
                      75003   ETHYL CHOLRIDE (chloroethane)
                     107062   ETHYLENE DICHLORIDE (1,2-dichloroethane)
                     107211   ETHYLENE GLYCOL
                               (Particulates)
                               (vapor)
                     151564   ETHYLENEIMINE
                      75218   ETHYLENE OXIDE
                      60297   ETHYL ETHER

                    7782414   FLUORINE
                      50000   FORMALDEHYDE
                      75127   FORMAMIDE
                      64186   FORMIC ACID
                      98011   FURFURAL
                      98000   FURFURYL ALCOHOL

                      76448   HEPTACHLOR
                     142845   p-HEPTANE
                      76683   HEXACHLOROBUTADIENE
                      77474   HEXACHLOROCYCLOPENTADIENE
                    1335871   HEXACHLORONAPHTHALENE
                     302012   HYDRAZINE
                      74908   HYDROGEN CYANIDE (hydrocyanic acid)
                    7664393   HYDROGEN FLUORIDE
                     123319   HYDROQUINONE (1,4-Benzenediol)

                     123922   ISOAMLY ACETATE (3-methylbutyl acetate)
                     123513   ISOAMYL ALCOHOL (3-methylbutanol)
                     110190   ISOBUTYL ACETATE (2-methylpropyl acetate)
                      78591   ISOPHORONE (3,5,5-trimethyl-2-cyclohexene-1-one)
                      67630   ISOPROPYL ALCOHOL
                      75310   ISOPROPYLAMINE

                     463514   KETENE (ethenone)

                     108316   MALEIC ANHYDRIDE (cis-butenedioic anhydride)
                      ---     MERCURY (alkyl compounds)
                               (all forms except alkyl compounds)
                      74895   METHYLAMINE
                     109864   METHYL CELLOSOLVE (2-Methoxyethanol)
                     101688   METHYLENE BIS PHENYL ISOCYANATE
                               (MDI diphenylmethane diisocyanate)
                      75092   METHYLENE CHLORIDE (dichloromethane)
                     101779   4,4'-METHYLENE DIANILINE (MDA)
                      78933   METHYL ETHYL KETONE
                               (MEK, 2-butanone, ethylmethyl ketone)
                      60344   METHYL HYDRAZINE (monomethyl hydrazine)
                     108101   METHYL ISOBUTYL KETONE (Hexone)
                      74931   METHYL MERCAPTAN
                      80626   METHYL METHACRYLATE (mentyl 2-methyl-2-propenoate)

                      91203   NAPHTHALENE
                              NICKEL
                   13463393    carbonyl
                    7440020    metal
                               insoluble compounds
                               soluble compounds
                     100016   p-NITROANILINE
                      98953   NITROBENZENE
                     100005   p-NITROCHLOROBENZENE (1-chloro-4-nitrobenzene)
                      55630   NITROGLYCERIN
                     108032   NITROPROPANE
                     99990    NITROTOLUENE
                    2234131   OCTACHLORONAPHTHALENE
                     144627   OXALIC ACID

                      87865   PENTACHLOROPHENOL
                      67721   PERCHLOROETHANE (hexachloroethane)
                     127184   PERCHLOROETHYLENE
                     108952   PHENOL
                     106503   p-PHENYLENEDIAMINE
                     100425   PHENYLETHYLENE (Styrene)
                     100630   PHENYLHYDRAZINE
                      75445   PHOSGENE (carbonyl chloride)
                    7803512   PHOSPHINE
                    7723140   PHOSPHORUS, yellow
                      88891   PICRIC ACID (2,4,6,-trinitrophenol)
                      75569   PROPYLENE OXIDE (1,2-epoxypropane)
                     110861   PYRIDINE

                     106514   QUINONE

                     108463   RESORCINOL
                              SELENIUM COMPOUNDS

                      79345   1,1,2,2-TETRACHLOROETHANE
                               (acetylene tetrachloride)
                     109999   TETRAHYDROFURAN
                              THALLIUM
                     108883   TOLUENE (toloul)
                      95534   o-TOLUIDINE (o-methylaniline)
                   8001352    TOXAPHENE (Chlorinated camphene)
                      71556   1,1,1-TRICHLOROETHANE (Methyl chloroform)
                    8006642   TURPENTINE

                     593602   VINYL BROMIDE (bromoethylene)
                      75354   VINYLIDENE CHLORIDE (1,1-dichloroethylene)

                    1330207   XYLENE (xylol, dimethylbenzene)
                    1300738   XYLIDINE (aminodimethylbenzene)

                     764687   ZINC CHLORIDE FUME