### REFERENCED DOCUMENTS:
RULES 1401 & 1402(AdoptedJune 1, 1990)(Amended December7, 1990)

RULE 1401. NEW SOURCE REVIEW OF CARCINOGENIC AIR

CONTAMINANTS (a) Purpose This rule specifies limits for maximum individual cancer risk and estimated excess
cancer cases from new permit units, relocations, or modifications to existing permit units which emit carcinogenic air contaminants. The rule establishes allowable risks forall such permitunits requiring newpermits pursuantto Rules 201 or203.

(b) Applicability 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. Permit units installed without a required permit to construct shall be subject to this rule, ifthe application for a permit to operate such equipment was submitted afterJune 1, 1990. The compounds listed in Table I will change periodically as new information becomes available. Applications shall be subjecttotheversion ofRule 1401 that is in effectatthetimethe application is received.

(c) Definitions (1) BEST AVAILABLE CONTROL TECHNOLOGY FOR TOXICS (T-BACT) means the most stringent emissions limitation or control technique which: (A) has been achieved in practice for such permit unit category or class of source; or (B) is any other emissions limitation or control technique, including process and equipment changes ofbasic and control equipment, found by the Executive Officer to be technologically feasible for such class
orcategoryofsources, orfora specific source. (2) CARCINOGENIC AIR CONTAMINANT is a substance that has been shown to cause cancer in animals or humans. For the purpose of this rule, carcinogenic aircontaminants arethose listed in Table I. (3) CONTEMPORANEOUS EMISSION REDUCTION means any real, permanent, and enforceable emission reduction that has occurred after the

1401

- 1Rule 1401 (Cont.) (Amended December7, 1990)

submittal of an application for a permit to construct, but before the start of operation ofthe permit unitassociated with the application. (4) EXCESS CANCERCASES meansthe estimated increase inthe occurrence of
cancer cases in a population subject to a lifetime (70 years) individual cancer risk of greater than or equal to one in one million (1 x 10-6) resulting from exposureto carcinogenicaircontaminants. (5) MAXIMUM INDIVIDUAL CANCER RISK is the estimated probability ofa potential maximally exposed individual contracting cancer as a result of exposure to carcinogenic aircontaminants overaperiod of70 years. (6) MODIFICATION means any physical change in, change in method of operation of, or addition to an existing permit unitthat 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: (A) an increase in the production rate, unless such increase will cause the maximum design capacityofthe equipmentto be exceeded; or (B) an increase inthe hours ofoperation; or (C) achange in ownership ofasource. (7) 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 publicly-owned sewage treatment operations each process within multi-process permit units at the facility shall be considered a separate permit unit forpurposes ofthis rule. (8) RECEPTOR LOCATION means any location outside the boundaries ofthe stationary source facility. (9) RELOCATION means the removal of an existing permit unit from one location in the South Coast Air Quality Management District and installation at another location. The removal ofa permit unit from one location within a stationary source and installation at another location within the stationary
source is a relocation only ifan increase in maximum individual cancer risk in
excess ofone in one million (1 x 10-6) occurs atany receptor location.

1401-2Rule 1401 (Cont.) (Amended December7, 1990)

(10) STATIONARY SOURCE means any permit unit or grouping ofpermit 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 bythe same person (orby persons undercommon control). Such above-described groupings, if remotely located and connected only by land carrying apipeline, shall notbe considered one stationary source. (11) ACCEPTABLE STACK HEIGHT for a permit unit is defined as a stack height that does not exceed two and one halftimes the height ofthe permit unit or two and one halftimes the height ofthe building housing the permit unit, and shall not be greater than 65 meters (213 feet), unless the applicant demonstrates to the satisfaction ofthe Executive Officerthat a greater height is necessary.
(d) Requirements The Executive Officershall denythe permitto construct a new, relocated or modified permit unit if emissions of any carcinogenic air contaminant may occur, unless the applicant has substantiated that the cumulative impact of emissions from the new, relocated or modified permit unit and all otherpermit units located within a radius of 100 meters owned oroperated bythe applicantforwhich applicationswere submitted
on orafterJune 1, 1990 will not result in anyofthe following: (1) a maximum individual cancer risk greater than one in one million (1 x 10-6) at any receptor location, ifthe permit unit is constructed without T BACT; (2) a maximum individual cancer risk greater than ten in one million (1 x 10-5) at any receptor location, if the permit unit is constructed with T-BACT; (3) greater than 0.5 excess cancer cases in the population subject to a risk of greaterthan one in one million (1 x 10-6). The maximum individual cancer risk may notexceed 1/70 ofthe maximum allowable risk specified in (d)(1) or (d)(2) in any one year at receptor locations in residential
areas.

1401-3Rule 1401 (Cont.) (Amended December7, 1990)

(e) RiskAssessment Procedures The Executive Officer shall periodically publish procedures for determining risks under this rule. To the extent possible, the procedures will be consistent with the policies and procedures of the California Department of Health Services. Such procedures shall specif~’: (1) Upper bound estimates of carcinogenic potency that shall be used in evaluating risks; (2) Compounds that must be subject to a multiple pathway risk assessment. A compound is subject to multiple pathway analysis if the Executive Officer determines that it may reasonably be expected to cause cancer risk through ingestion exposure, ifit is expected to deposit and persist in the environment afteremission, and ifa quantitative oral potencyestimate has been derived for the compound; (3) Health protective assumptions that shall be used in evaluating exposure to compounds from inhalation and otherroutes ofexposure. This will include an assumption ofa 70 years period ofoperation for the sources ofcarcinogenic aircontaminants; (4) Risk for the potential maximally exposed individual shall be based upon continuous exposure for 70 years in residential areas and health protective estimates ofexposure duration in nonresidential areas; (5) Estimates of pollutant dispersion and risk from a source shall not be based upon stackheight in excess ofacceptable stack height.

(f) Emissions Calculations Thetotal carcinogenic emissions fora new, relocated or modified permit unit(s) 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; and (2) the maximum possible annual hours ofoperation; and (3) the actual materials processed. Forthe purpose ofthis rule, total carcinogenic emissions from a permit unit(s) shall be calculated and reviewed pursuanttothis rule.

1401-4Rule 1401 (Cont.) (Amended December7, 1990)

(g) Exemptions (1) The requirements ofparagraph (d) shall notapplyto: (A) Any stationary source which is a continuing operation, without modification or change in operating conditions, for which a permit to operate is required solely because of permit renewal or change of ownership; or (B) Modification or relocation ofa permit unit that causes

# a reduction or
no increase in the estimated cancer cases or individual cancer risk at any receptorlocation. (C) A permit unit replacing a functio.ally identical permit unit, providing there is no increase in maximum rating or increase in emissions ofany carcinogenic aircontaminants. (D) Installation, construction, modification or relocation ofa permit unit if the applicantdemonstrates that: (i) a contemporaneous emission reduction in actual emissions of carcinogenic air contaminants from a permit unit or permit units at the stationary source will occur such that the risk at all receptor locations is less than the risk priorto installation, construction, modification orrelocation, and (ii) the emissions reductions necessary to achieve the risk reduction required bythis paragraph are permanent, verifiable and enforceable through permitconditions, and (iii) T-BACT will be used on new equipment that is part ofthe installation, construction or modification subject to this paragraph. (E) A publicly owned sewage treatment operation, or a ground water or soil contamination cleanup or remediation operation mandated to maintain or attain compliance with federal, state, or local law or by judicial or administrative agency order, provided that permit units will be constructed using,T-BACT ifthe maximum individual cancer risk is greater than one in one million. The permit to construct shall require such facilities to meet the risk requirements of this rule not laterthan June 1, 1995.

1401-5Rule 1401 (Cont.) (Amended December7, 1990)

(2) The provisions of subparagraph (d)(2) shall not apply if the applicant demonstrates the following tothe satisfactionofthe Executive Officer: (A) The cumulative impact of 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 applications were submitted on orafterJune 1, 1990will notresult in a maximum individual cancer risk greater than 100 in one million (1 x 10~) atany receptorlocation, (B) The unitwill be constructedwith T-BACT, and (C) The applicant has investigated, and will implement to the extent reasonablyachievable, all potential methods and processesto reduce or control emissionsto levels which would complywith the provisions of subparagraph (d)(2), including but not limitedto: (i) source reduction; (ii) innovative control technologies; (iii) material orprocess substitution; and (iv) alternate locations withinthe facility. The permit to construct shall require compliance with the provisions of subparagraph (d)(2) not laterthan 5 years afterJune 1, 1990.

1401-6Rule 1401 (Cont.) (Amended December7, 1990)

TABLE I
CARCINOGENICAIR CONTAMINANTS
Substance Acetaldehyde Acrylamide Acrylonitrile InorganicArsenic Asbestos Benzene Benzidene PolynuclearAromatic Hydrocarbons (PAH) Benz(a)anthracene Benzo(a)pyrene Benzo(b)fluoranthene Benzo(k)fluoranthene Chrysene Dibenz(a,h)anthracene Indenopyrene Beryllium Bis(2-chloroethyl)ether Bis(chloromethyl)ether 1,3-Butadiene Cadmium Carbon Tetrachioride Chlorinated Dioxins and Dibenzofurans (TCDD equivalent)b Chloroform Chromium, Hexavalent 3,3-Dichlorobenzidene 2,4-Dinitrotoluene 1 ,4-Dioxane Diphenyihydrazine Epichlorohydrin CAS Numbera 75-07-0 79-06-01 107-13-1 7440-38-2 1332-21-4 71-43-2 92-87-5

56-55-3 50-32-8 205-99-2 207-08-9 218-01-9 53-70-3 193-39-5 7440-41-7 111-44-4 542-88-1 106-99-0 7440-43-9 56-23-5

67-66-3 7440-47-3 91-94-1 121-14-2 123-91-1 122-66-7 106-89-8 iJate ofListing December7, 1990 December7, 1990 December7, 1990 December7, 1990 June 1, 1990 June 1, 1990 December7, 1990

December7, 1990 December7, 1990 December7, 1990 December7, 1990 December7, 1990 December7, 1990 December7, 1990 December7, 1990 December7, 1990 December7, 1990 December7, 1990 June 1, 1990 June 1, 1990

June 1, 1990 December7, 1990 June 1, 1990 December7, 1990 December 7, 1990 December7, 1990 December7, 1990 December7, 1990

1401-7Rule 1401 (Cont..) (Amended December7, 1990)

Substance CAS Numbera Date ofListing Ethylene Dibromide 106-93-4 June 1, 1990 Ethylene Dichioride (1,2 Dichloroethane) 107-06-2 June 1, 1990 Ethylene Oxide 75-21-8 June 1, 1990 Formaldehyde 50-00-0 December7, 1990 Hexachlorobenzene 118-74-1 December7, 1990 Hexachiorocyclohexane: technical grade

---- December7, 1990 alpha isomer 319-84-6 December7, 1990 Methylene Chloride 75-09-2 June 1, 1990 Nickel: refinery dust

---- December7, 1990 subsulfide 0120-35-722 December7, 1990 N-Nitroso Compounds: Dimethylnitrosamine 62-75-9 December7, 1990 Diethylnitrosamine 55-18-5 December7, 1990 Dibutylnitrosamine 924-16-3 December7, 1990 N-nitrososopyrrolidine 930-55-2 December7, 1990 N-nitrosodiphenylamine 86-30-6 December7, 1990 N-nitroso-N-ethylurea 759-73-9 December7, 1990 N-nitroso-N-methylurea 684-93-5 December 7, 1990 Polychiorinated biphenyls 1336-36-3 December7, 1990 Trichioroethylene 79-01-6 December7, 1990 2,4,6-Trichlorophenol 88-06-2 December7, 1990 Vinyl chloride 75-01-4 December 7, 1990
aChemical Abstracts Service Number
bCfflorinated dioxins and furans comprise a number of homologue groups (tetra, penta, etc.) and each homologue group includes a number of isomers. TCDD equivalents shall be calculated according to the method recommended by the California Department of Health Services (DHS) according to “Scenario 4” presented in the Technical Support Document for the “Report on Chlorinated Dioxins and Dibenzofurans” (Part B) prepared bythe staffofthe DHS.

1401-8(AdoptedApril 8, 1994)

RULE 1402. CONTROL OF TOXIC AIR CONTAMINANTS FROM EXISTING

SOURCES (a) Purpose The purpose ofthis rule isto reducethe health riskassociated with emissions oftoxic air contaminants from existing sources by specifying limits for maximum individual
cancer risk (MICR) and noncancer acute and chronic hazard index (HI) applicable to total facility emissions and requiring facilities to implement risk reduction plans to achievethese risk limits as required bythe Hot SpotsAct.
(b) Summary The rule requires the operator of any facility which poses a health risk exceeding significant risk levels ofa MICR ofone hundred in one million (1.0 x 10~) oratotal acute orchronic HI offive (5.0) to submit and implementa risk reduction plan which will reduce belowthe significant risk levels as quickly as feasible but by no laterthan five (5) yearsfromthe initial plan submittal date.
(c) Applicability This rule shall apply to any facility for which the impact oftotal facility emissions exceeds anysignificant risk level as indicated in one ofthe following: (1) A health riskassessment required pursuantto the Hot Spots Act and approved bythe District; (2) A health risk assessment prepared by the District forthe purpose ofthis rule fora facility orcategory offacilities, including but not limited to facilities for which the District has prepared an industrywide emission inventory pursuant to the Hot SpotsAct; or (3) A health risk assessment required pursuant to subdivision (e) ofthis rule and approved bythe District. Exceptforfacilities subjectto the rule pursuantto paragraph (c)(2), this rule shall not applyto facilities which have not been notified bythe Districtto prepare a health risk assessment pursuantto this rule orthe Hot Spots Act.

1402

- 1Rule 1402 (Cont.) (Adopted April 8, 1994)

(d) Definitions (1) ACCEPTABLE STACK HEIGHT for a permit unit is defined as a stack height that does not exceed two and one halftimes the height ofthe permit unit or two and one halftimes the height ofthe building housing the permit unit, and shall not be greater than 65 meters (213 feet), unless the operator demonstrates to the satisfaction ofthe Executive Officer that a greater height is necessary. (2) FACILITY means any permit unit or grouping of permit units or other air contaminant-emitting activities which are located In one or more contiguous propertieswithinthe District, in actual physical contactorseparately solely by
a public roadway or other public right-of-way, and are owned or operated by the same person (or persons under common control). Such above-described groupings, ifremotely located and connected only by land carrying a pipeline. shall notbe considered one facility. (3) HOT SPOTS ACT means the Air Toxics “Hot Spots” Information ‘and Assessment Act of 1987, incorporated at Part 6, Division 26 ofthe Health and Safety Code, and amendmentstothis act. (4) INDIVIDUAL SUBSTANCE ACUTE HAZARD INDEX (HI) is the ratio of the estimated maximum one-hour concentration ofatoxic aircontaminantata receptorlocation to its acute reference exposure level.

- (5) INDIVIDUAL SUBSTANCE CHRONIC HAZARD INDEX (HI) is the ratio ofthe long-term level of exposure to a toxic air contaminant for a potential maximally exposed individual to the chronic reference exposure level for the toxic aircontaminant. (6) INITIAL PLAN SUBMITTAL DATE is the date thatthe initial risk reduction plan is submitted to the District, but no later than~ six months following notification bythe Executive Officerthata riskreduction plan is‘required. (7) MAXIMUM INDIVIDUAL CANCER RISK (MICR) is the estimated probability ofa potential maximally exposed individual contracting cancer as
a result ofexposure totoxic aircontaminants. (8) OPERATOR means the person who owns or operates a facility or part of a facility.

1402-2Rule 1402 (Cont.) (Adopted April 8, 1994)

(9) RECEPTOR LOCATION means: (A) for the purpose of calculating acute HI, any location outside the boundaries of the facility at which a person could experience acute exposure; and (B) for the purpose of calculating chronic HI or MICR, any location outside the boundaries of the facility at which a person could experience chronic exposure. The Executive Officershall considerthe possibility ofpotential exposure at a location in determining whether the location will be considered a receptor location. (10) RISK REDUCTION MEASURE is a control measure which will reduce or eliminate the health risk associated with emissions oftoxic air contaminants, is real, permanent, quantifiable, and enforceable through District permit conditions if applicable, and meets the requirements of the Hot Spots Act. Risk reduction measures may include, but are not limited to feedstock modification; product reformulations; production system modifications; system enclosure, emissions control, capture or conversion; operational standards or practices modifications; emissions collection and exhaust; source control; oralternativetechnologies. (11) SIGNIFICANT RISK LEVEL for purpose of this rule is a MICR of one hundred in one million (1.0 x 10~) or atotal acute or chronic HI greaterthan five (5.0) for any target organ system at any receptor location, as calculated forthetoxic aircontaminants listed inTables I, II and III. (12) TOTAL ACUTE HAZARD INDEX (HI) is the sum of the individual substance acute HIs for all toxic air contaminants identified in the risk assessmentguidelines as affectingthe sametargetorgan system. (13) TOTAL CHRONIC HAZARD INDEX (HI) is the sum of the individual substance chronic HIs for all toxic air contaminants identified in the risk assessment guidelines as affectingthe sametargetorgan system. (14) 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 presentorpotential hazardto human health. Forthe purpose ofthis rule, toxic aircontaminants arethose listed inTables I, II and III.

1402-3Rule 1402 (Cont.) (Adopted April 8, 1994)

(e) RiskAssessment Requirements Within 150 days ofthe date ofnotification bythe Executive Officer, an operator shall submit to the District a health risk assessment for total facility emissions. The Executive Officer may require a health risk assessment from a facility when in possession of information indicating that emission levels from the facility could potentiallycause exceedance ofthe significant risk levels.
(1) RiskReduction Requirements The following requirements shall apply to the operator of any facility whose emissions cause an exceedance ofany significant risk level as indicated in a health riskassessment approved orprepared bythe District: (1) RiskLevel Attainment Requirements The operator shall implement the risk reduction measures specified in a risk reduction plan approved bythe Executive Officerto reduce the impact oftotal facility emissions below the significant risk levels as quickly as feasible but by no laterthan five (5) years from the initial plan submittal date. Each risk reduction measure in an approved plan shall be implemented by the dates specified inthe plan forthat riskreduction measure. (2) Submittal ofRisk Reduction Plans (A) The Executive Officer shall publish procedures for preparing risk reduction plans under this rule. The procedures shall include self-

• conducted audits and checklists which may be used by certain categories offacilities in lieu ofpreparing ariskreduction plan. (B) Within 180 days ofthe date of notification by the Executive Officer, the operator shall submit to the Executive Officer for approval a risk reduction plan which includes ata minimum all ofthe following: (i) The name, address, SCAQMD identification number and SIC

• code ofthe facility; (ii) A facility risk characterization which includes an updated air toxics emission inventoryand health riskassessment, ifthe risk due to total facility emissions has increased above the level indicated inthe previouslyapproved health riskassessment; (iii) Identification ofeach source from which risk must be reduced in orderto achievethe significant risk levels;

1402-4Rule 1402 (Cont.) (Adopted April 8, 1994)

(iv) Foreach source identified in clause (f)(2)(B)(iii), an evaluation of the risk reduction measures available to the operator, including emission and risk reduction potential and time necessaryfor implementation; (v) Specification of the risk reduction measures that shall be implemented by the operator to comply with the risk level attainment requirements ofparagraph (f)(1); (vi) A schedule for implementing the specified risk reduction
measures as quickly asfeasible. The schedule shall include the submittal ofall necessary applications for permits to construct
or modify within 180 days of approval of the plan, or in accordance with another schedule subject to approval of the Executive Officer, and specifythe dates forother increments of progress associated with implementation ofthe risk reduction measures; (vii) An estimation ofthe residual health risk after implementation ofthe specified riskreduction measures; (viii) Proofofcertification ofthe risk reduction plan as meeting all requirements by an engineerwho is registered as a professional engineer pursuant to Business and Professions Code Section 6762, by an individual who is officially responsible for the processes and operations of the facility, or by a registered environmental assessor. (3) Approval ofRisk Reduction Plans (A) The Executive Officer shall approve or rejectthe plan within three (3) months of submittal based on the operator’s ability to demonstrate timely compliance with the risk level attainment requirements of paragraph (f)(l). The operator may appeal the rejection ofa plan or the failure ofthe Executive Officer to act on a plan submittal to the Hearing Board under Rule 216. Plans shall be revised and resubmitted within 90 days ofthe date ofreceipt ofa rejection notice. The revised plan shall correct all deficiencies identified by the Executive Officer. The approved plan shall be subjectto Rule 221.

1402-5Rule 1402 (Cont.) (Adopted April 8, 1994)

(B) If the risk reduction plan contains a facility risk characterization demonstrating to the satisfaction of the Executive Officer that the facility does not exceed the significant risk levels, the plan may be approved without the inclusion of the plan components specified in subparagraphs (f)(2)(B)(iii) through (vii). (4) Progress Reports The operator shall submit to the Executive Officer for approval, by no later than the date(s) that updates of emission inventories are required for the facility pursuant to the Hot Spots Act and no less frequently than every two (2) years, progress report(s) on the emissions and risk reduction achieved by the planwhich include ataminimum all ofthe following: (A) The increments of progress achieved in implementing the risk reduction measures specified inthe plan; (B) A schedule indicating datesforfuture increments ofprogress; (C) Identification ofany increments ofprogress that have been orwill be achieved later than specified in the plan and the reason for achieving the increments late;• (D) A description of any increases or decreases in emissions oftoxic air contaminants that have occurred atthe facility, including a description of any associated permits that were subject to Rule 101, since approval ofthe plan. (5) Updating ofRisk Reduction Plans If information becomes known to the Executive Officer after the initial plan submittal date on air toxics risks posed by the facility or emission reduction technologies that may be used by the facility that would substantially impact risks to exposed persons or implementation of the risk reduction plan, the Executive Officermay requirethe planto be updatedand resubmitted.

1402-6Rule 1402 (Cont.) (Adopted April 8, 1994)

(6) Plan ModificationforChange ofRiskReduction Measures Prior to a change in the risk reduction measures specified in the currently approved plan, the operator shall submitto the Executive Officer forapproval
an application for plan modification. The application shall include a demonstration that the change of risk reduction measures will not result in compliance with the significant risk levels later than provided in paragraph (f)(1).
(g) RiskAssessment Procedures (1) The Executive Officer shall periodically publish or designate procedures for determining health risks under this rule. To the extent possible, the procedures shall be consistent with the policies and procedures ofthe Office of Environmental Health Hazard Assessment (OEHHA). Such procedures shall specif~’: (A) Acute and chronic reference exposure levels and upper bound estimates of carcinogenic potency that shall be used in evaluating risks; (B) Compounds that must be subject to a multiple pathway risk assessment. Acompound is subjectto multiple pathway analysis ifthe Executive Officer determines that it may reasonably be expected to
cause health risk through ingestion exposure, if it is expected to deposit and persist in the environment after emission, and if a quantitative oral cancer potency estimate or reference exposure level has been derivedforthe compound; (C) Health protective assumptions that shall be used in evaluating exposure to compounds from inhalation and other routes ofexposure. This will include an assumption of a 70 year period ofoperation for the sources oftoxic aircontaminants; (D) Risk for the potential maximally exposed individual shall be based upon continuous exposure for 70 years in residential areas and health protective estimates ofexposure duration in nonresidential areas; (E) Estimates of pollutant dispersion and risk from a source shall not be based upon stackheight in excess ofacceptable stackheight.

1402-7Rule 1402 (Cont.) (Adopted April 8, 1994)

(2) Within 120 days ofpublication ofthe risk assessment guidelines required to be published by the OEHHA pursuant to the Air Toxics “Hot Spots” Information and AssessmentAct of 1987, the Executive Officershall reportto the District Governing Board ifthere are any material differences between the OEHHA guidelines and the criteria specified in paragraph (g)(1) and recommend for Board approval whether to proceed with amendments to this rule in order to make the rule consistent with the OEHHA guidelines before theirdesignation asthe riskassessmentguidelines underthis rule. (3) The Executive Officer shall publish procedures fordetermining the emissions estimatesto be used in riskassessments in cases in which acompound has not been detected in analyses which have been conducted according to Districtapproved methods, including procedures for excluding such compounds from risk assessments. The procedures shall provide methods for estimating the most likely emission levels of non-detected compounds based on consideration ofthe likelihood ofpresence and the method detection limits of compounds.
(h) Alternate Hazard Index Levels An alternate hazard index level may be used as the significant risk level for a particular total acute or chronic HI if the Office of Environmental Health Hazard Assessment determines that such alternate hazard index level is protective against adverse health effects. The alternate HI level shall not in any case exceed 10. The facility operatorshall attainthe alternate HI level as quicklyasfeasible but by no later than five (5) yearsfromthe initial plan submittal date.
(i) Compliance with this rule does not authorize the emission ofatoxic aircontaminant in violation of any federal, state, local or District law or regulation or exempt the operatorfrom any laworregulation.
(j) Risk reduction measures implemented in order to comply with other regulatory requirements are acceptable risk reduction measures for the purposes of this rule, provided they are consistentwiththe requirements ofthis rule.

1402-8Rule 1402 (Cont.) (Adopted April 8, 1994)

TABLE I TOXIC AIR CONTAMINANTS TO BE EVALUATED FOR CANCER RISK
Substance CAS Numb& Acetaldehyde 75-07-0 Acrylamide 79-06-01 Acrylonitrile 107-13-1 Arsenic and compounds (inorganic) 7440-38-2 Asbestos 1332-21-4 Benzene 71-43-2 Benzidine (and its salts) 92-87-5 Beryllium 7440-41-7 Bis(2-chloroethyl)ether 111-44-4 Bis(chloromethyl)ether 542-88-1 1,3-But!diene 106-99-0 Cadmium and compounds 7440-43-9 Carbontetrachioride ‘56-23-5 Chlorinated dioxins and dibenzofurans (TCDD equivalents)b Chloroform 67-66-3 Chloroprene 126-99-8 Chromium (hexavalent) 7440-47-3 Coke oven emi-ssions 1,2-Dibromo-3-chloropropane 96-12-8 p-Dichlorobenzene 106-46-7 3,3’-Dichlorobenzidene 91-94-1 Di(2-ethylhexyl)phthalate 117-81-7 2,4-Dinitrotoluene 121-14-2 1,4-Dioxane 123-91-1 Diphenyihydrazine 122-66-7 Epichiorohydrin 106-89-8 Ethylene dibromide 106-93-4 Ethylene dichloride 107-06-2 Ethylene oxide 75-21-8 Formaldehyde 50-00-0 Hexachlorobenzene 118-74-1 Hexachiorocyclohexanes Hydrazine 302-01-2

1402-9Rule 1402 (Cont.) (Adopted April 8, 1994)

TABLE I (Cont.)

Substance CAS Numbera Methylene chloride 75-09-2 Nickel and compounds N-Nitroso compounds: Dimethylnitrosamine 62-75-9 Diethylnitrosamine 55-1 8-5 Dibutylnitrosamine 924-16-3 N-Nitrosodi-n-propylamine 621-64-7 N-Nitrosomethylethylamine 10595-95-6 N-Nitrosopyrrolidine 930-55-2 N-Nitrosodiphenylamine 86-30-6 N-Nitroso-N-ethylurea 759-73-9 N-Nitroso-N-methylurea 684-93-5 Pentachiorophenol 87-86-5 Perchioroethylene 127-18-4 Polychiorinated biphenyls 1336-36-3 Polynucleararomatic hydrocarbons (PAM) Benz(a)anthracene 56-55-3 Benzo(a)pyrene 50-32-8 Benzo(b)fluoranthene 205-99-2 Benzo(k)fluoranthene 207-08-9 Chrysene 218-01-9 Dibenz(a,h)anthracene 53-70-3 Indeno(1 ,2,3-cd)pyrene 193-39-5 Propylene oxide 75-56-9 Trichioroethylene 79-01-6 2,4,6-Trichiorophenol 88-06-2 Urethane (Ethyl carbamate) 51-79-6 Vinyl chloride 75-01-4

aChemical Abstracts Service Number bChlorinated dioxins and furans comprise a number ofhomologue groups (tetra, penta, etc.) and each homologue group includes a number of isomers. TCDD equivalents shall be calculated according to the method recommended by the California Environmental ProtectionAgency, Office ofEnvironmental Health HazardAssessment.

1402

- 10Rule 1402 (Cont.) (Adopted April 8, 1994)

TABLE II TOXICAIR CONTAMINANTS TO BE EVALUATED FOR CHRONIC HAZARD INDEX

Substance CAS Numbera Acetaldehyde 75-07-0 Acrolein 107-02-8 Acrylamide 79-06-01 Acrylonitrile 107-13-1 Ammonia 7664-41-7 Arsenic 7440-38-2 Benzene 71-43-2 Benzidine (and its salts) 92-87-5 Benzyl chloride 100-44-7 Beryllium 7440-41-7 Bromine 7726-95-6 Bromine pentafluoride 7789-30-2 Cadmium 7440-43-9 Carbon tetrachioride 56-23-5 Chlorinated dioxins and dibenzofurans (TCDD equivalent)b Chlorine 7782-50-5 Chlorobenzene 108-90-7 Chlorinated fluorocarbon (CFC-1 13) 76-13-1 Chloroform 67-66-3 2-Chiorophenol 95-57-8 Chloropicrin 76-06-2 Chloroprene 126-99-8 Chromium (hexavalent) 7440-47-3 Copperand compounds Cresol (o, m and p isomers) 1,2-Dibromo-3-chloropropane 96-12-8 p-Dichlorobenzene 106-46-7 Di(2-ethylhexyl)phthalate 117-81-7 Dimethylamine 124-40-3 1,4-Dioxane 123-91-1 Epichlorohydrin 106-89-8

1402

- 11Rule 1402 (Cont.) (Adopted April 8, 1994)

TABLE II (Cont.)

Substance CAS Numbera Ethyl acrylate 140-88-5 Ethyl chloride 75-00-3 Ethylene dibromide 106-93-4 Ethylene dichioride 107-06-2 Ethyleneglycol butyl ether 111-76-2 Ethylene glycol ethyl ether 110-80-5 Ethylene glycol ethyl etheracetate 111-15-9 Ethylene glycol methyl ether 109-86-4 Ethylene glycol methyl etheracetate 110-49-6 Ethylene oxide 75-21-8 Formaldehyde 50-00-0 Glutaraldehyde 111-30-8 Hexachlorobenzene 118-74-1 Hexachiorocyclohexane, gamma isomer 58-89-9 Hexachlorocyclopentadiene 77-47-4 Hydrazine 302-01-2 Hydrochloric acid 7647-01-0 Hydrogen bromide 10035-10-6 Hydrogen cyanide 74-90-8 Hydrogen fluoride 7664-39-3 Hydrogen sulfide 7783-06-4 Lead and compounds Maleic anhydride 108-31-6 Manganese and compounds Mercuryand compounds (inorganic) Methanol 67-56-1 Methyl bromide 74-83-9 Methyl chloroform (1,1,1 -TCA) 71-55-6 Methyl isocyanate 624-83-9 Methyl mercury 593-74-8 Methyl methacrylate 80-62-6 Methylene chloride 75-09-2 4,4’-Methylene dianiline (and its dichioride) 101-77-9 Mineral fibers (<1% free silica) Naphthalene 91-20-3

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- 12Rule 1402 (Cont.) (AdoptedApril 8, 1994)

TABLE II (Cont.)

Substance CAS Numbera Nickel and compounds Nitrobenzene 98-95-3 2-Nitropropane 79-46-9 Pentachiorophenol 87-86-5 Perchioroethylene 127-18-4 Phenol 108-95-2 Phosphine 7803-51-2 Phosphorus (white) 7723-14-0 Phthalicanhydride 85-44-9 Polychiorinated biphenyls 1336-36-3 Propylene oxide 75-56-9 Selenium and compounds Sodium hydroxide 1310-73-2 Styrene 100-42-5 Tetrachiorophenols Toluene 108-88-3 Toluene-2,4-diisocyanate 584-84-9 Toluene-2,6-diisocyanate 91-08-7 Trichloroethylene 79-01-6 Vinyl chloride 75-01-4 Vinylidene chloride 75-35-4 Xylene (o, m and p isomers) Zincand compounds
aChemical Abstracts Service Number bCfflorinated dioxins and furans comprise a number ofhomologue groups (tetra, penta, etc.) and each homologue group includes a number of isomers. TCDD equivalents shall be calculated according to the method recommended by the California Environmental ProtectionAgency, Office ofEnvironmental Health HazardAssessment.

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- 13Rule 1402 (Cont.) (Adopted April 8, 1994)

TABLE III TOXIC AIR CONTAMINANTS TO BE EVALUATED FORACUTE HAZARD INDEX

Substance CAS Numbera Acrolein 107-02-8 Ammonia 7664-41-7 Arsine 7784-42-1 Benzyl chloride 100-44-7 Carbon tetrachloride 56-23-5 Chlorine 7782-50-5 Copperand compounds 1,4-Dioxane 123-91-1 Ethylene glycol butyl ether 111-76-2 Ethylene glycol ethyl ether 110-80-5 Ethylene glycol ethyl etheracetate 111-15-9 Ethylene glycol methyl ether 109-86-4 Formaldehyde 50-00-0 Hydrochloricacid 7647-01-0 Hydrogen cyanide 74-90-8 Hydrogen fluoride 7664-39-3 Hydrogen sulfide 7783-06-4 Maleic anhydride 108-31-6 Mercury (inorganic) Methyl chloroform (1,1,1 -TCA) 71-55-6 Methylene chloride 75-09-2 Nickel and compounds Perchloroethylene 127-18-4 Phosgene 75-44-5 Propylene oxide 75-56-9 Selenium and compounds Sodium hydroxide 1310-73-2 Xylene (o, m and p isomers)
aChemical Abstracts Service Number

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