PART 766—DIBENZO-PARA-DIOXINS/DIBENZOFURANS Authority: 15 U.S.C. 2603 and 2607. Source: 52 FR 21437, June 5, 1987, unless otherwise noted. Subpart A—General Provisions § 766.1 Scope and purpose. (a) This part identifies requirements for testing under section 4 of the Toxic Substances Control Act (TSCA), 15 U.S.C. 2603, to ascertain whether certain specified chemical substances may be contaminated with halogenated dibenzodioxins (HDDs)/dibenzofurans (HDFs) as defined in § 766.3, and requirements for reporting under section 8 of TSCA, 15 U.S.C. 2607. (b) Section 766.35(b) requires manufacturers and processors of chemical substances identified in § 766.25 to submit to EPA: (1) Any existing test data showing analysis of the chemical substances for concentrations of HDDs/HDFs, applicable protocols, and the results of the analysis for HDDs/HDFs, (2) allegations of significant adverse reactions to HDDs/HDFs, compiled in accordance with part 717 of this chapter, and (3) health and safety studies on the HDDs/HDFs, in accordance with applicable provisions of part 716 of this chapter. (c) Section 766.35(a) requires manufacturers and, under certain circumstances, processors of chemical substances identified in § 766.25 to submit letters of intent to test and protocols for the analysis of the chemical substances for the presence of HDDs/HDFs. Section 766.20 requires these manufacturers and processors to test their chemical substances for the presence of HDDs/HDFs. Any submissions must be in accordance with the EPA Procedures Governing Testing Consent Agreements and Test Rules contained in part 790 of this chapter and any modifications to such procedures contained in this part. (d) Section 766.32 specifies conditions under which persons required to test may request an exclusion or waiver from testing. (e) Deadlines for submission to EPA of protocols, reports, studies, and test results are specified in part 790, subpart C and § 766.35. (f) Sections 766.10, 766.12, 766.14, 766.16, and 766.18 prescribe analytical methods required; § 766.27 prescribes target levels of quantitation (LOQ) for each congener for which quantitation is required. (g) If results of existing tests or tests performed under this part indicate the presence of HDDs/HDFs in the identified chemical substance above the LOQ specified in § 766.27, § 766.35(c) requires the following additional reporting on the specified chemicals: production, process, use, exposure and disposal data under section 8(a) of TSCA; health and safety studies under section 8(d) of TSCA; and reports of allegations of significant adverse reactions under section 8(c) of TSCA. In some cases, additional reporting may be required of manufacturers reporting no contamination of the identified chemical substances under § 766.35(c)(2). (h) Section 766.38 requires manufacturers of chemical substances produced from chemical substances identified as possible precursors to HDD/HDF formation, to report on chemical substances produced from such precursors. § 766.2 Applicability and duration of this part. (a) Chemical substances subject to testing. (2) The duration of this part for any testing requirement for any chemical substance is the period commencing with the effective date of this part to the end of the reimbursement period, as defined in § 766.3, for each chemical substance. All reporting requirements for any chemical substance listed under § 766.25 shall be in effect for the same period as the testing requirement. (b) Precursor chemical substances. (2) The requirement for precursor reporting under § 766.38 shall be in effect until three years after the effective date of this part. (3) Small manufacturers are exempt from reporting process and reaction condition data on chemical substances made from precursor chemical substances listed under § 766.38. § 766.3 Definitions. The definitions in section 3 of TSCA and the definitions of §§ 704.3, 716.3, 717.3, and 790.3 of this chapter also apply to this part. Central Data Exchange CDX Chemical Information Submission System CISS Congener Dibenzofuran Dibenzo-p-dioxin dioxin Guidelines Guidelines for the Determination of Polyhalogenated Dioxins and Dibenzofurans in Commercial Products, HDD 2,3,7,8-HDD HDF 2,3,7,8-HDF Homolog tetra-, T (4 atoms) penta-, Pe (5 atoms) hexa-, Hx (6 atoms) hepta-, Hp (7 atoms) HRGC HRMS Level of quantitation LOQ Polybrominated dibenzofurans Polybrominated dibenzo-p-dioxin PBDD Polychlorinated dibenzofuran Polychlorinated dibenzo-p-dioxin PCDD Polyhalogenated dibenzofuran PHDF Polyhalogenated dibenzo-p-dioxin PHDD Positive test result Precursor QA QC Reimbursement period TSCA et seq. [52 FR 21437, June 5, 1987, as amended at 78 FR 72828, Dec. 4, 2013] § 766.5 Compliance. Any person who fails or refuses to comply with any aspect of this part is in violation of section 15 of TSCA. Section 15(1) makes it unlawful for any person to fail or refuse to comply with any rule or order issued under section 4. Section 15(3) makes it unlawful for any person to fail or refuse to submit information required under this part. Section 16 provides that a violation of section 15 renders a person liable to the United States for a civil penalty and possible criminal prosecution. Under section 17 of TSCA, the district courts of the United States have jurisdiction to restrain any violation of section 15. § 766.7 Submission of information. (a) All information (including letters of intent, protocols, data, forms, studies, and allegations) submitted to EPA under this part must bear the applicable Code of Federal Regulations (CFR) section number (e.g., § 766.20). (b) You must use the CISS tool to complete and submit all data, reports, and other information required under this part except for records and reports of allegations of significant adverse reactions, which must be submitted in accordance with paragraph (c) of this section. (1) Submissions must be submitted to EPA via CDX. (2) To access the CISS tool go to https://cdx.epa.gov/ssl/CSPP/PrimaryAuthorizedOfficial/Home.aspx http://www.epa.gov/oppt/chemtest/ereporting/index.html. (c) You must submit records and reports of allegations of significant adverse reactions and the accompanying cover letters by one of the following methods: (1) Mail, preferably certified, to the Document Control Office (DCO) (7407M), Office of Pollution Prevention and Toxics (OPPT), Environmental Protection Agency, 1200 Pennsylvania Ave. NW., Washington, DC 20460-0001, ATTN: Dioxin/Furan report part 766, Allegations of significant adverse reactions. (2) Hand delivery to OPPT Document Control Office (DCO), EPA East, Rm. 6428, 1201 Constitution Ave. NW., Washington, DC, ATTN: Dioxin/Furan report part 766, Allegations of significant adverse reactions. The DCO is open from 8 a.m. to 4 p.m., Monday through Friday, excluding legal holidays. The telephone number for the DCO is (202) 564-8930. Such deliveries are only accepted during the DCO's normal hours of operation. [78 FR 72828, Dec. 4, 2013] § 766.10 Test standards. Testing required under subpart B of this part must be performed using the protocols submitted to and reviewed by the EPA expert panel established under § 766.28. All new data, documentation, records, protocols, specimens, and reports generated as a result of testing under subpart B of this part must be fully developed and retained in accordance with part 792 of this chapter. These items must be made available during an inspection or submitted to EPA upon request by EPA or its authorized representative. Laboratories conducting testing for submission to EPA in response to a test rule promulgated under section 4 of TSCA must adhere to the TSCA Good Laboratory Practices (GLPs) published in part 792 of this chapter. Sponsors must notify the laboratory that the testing is being conducted pursuant to TSCA section 4. Sponsors are also responsible for ensuring that laboratories conducting the testing abide by the TSCA GLP standards. At the time test data are submitted, manufacturers must submit a certification to EPA that the laboratory performing the testing adhered to the TSCA GLPs. § 766.12 Testing guidelines. Analytical test methods must be developed using methods equivalent to those described or reviewed in Guidelines for the Determination of Polyhalogenated Dibenzo-p-dioxins and Dibenzofurans in Commercial Products. [60 FR 34466, July 3, 1995, as amended at 77 FR 46292, Aug. 3, 2012] § 766.14 Contents of protocols. Protocols should include all parts of the Quality Assurance Plan for Measurement of Brominated or Chlorinated Dibenzofurans and Dibenzodioxins, § 766.16 Developing the analytical test method. Because of the matrix differences of the chemicals listed for testing, no one method for sample selection, preparation, extraction and clean up is prescribed. For analysis, High Resolution Gas Chromatography (HRGC) with High Resolution Mass Spectrometry (HRMS) is the method of choice, but other methods may be used if they can be demonstrated to reach the target LOQs as well as HRGC/HRMS. (a) Sample selection. (b) Sample preparation. (c) Sample extraction and cleanup. Quality Assurance Plan for Measurement of Brominated or Chlorinated Dibenzofurans and Dibenzodioxins, (d) Analysis. § 766.18 Method sensitivity. The target level of quantitation required under § 766.27 for each HDD/HDF congener is the level which must be attempted for each resolved HRGC peak for that congener. For at least one product sample, at least two analyses of the same isotopically labeled HDD/HDF internal calibration standards spiked to a final product concentration equal to the LOQ for that congener must be reproducibly extracted, cleaned up, and quantified to within ±20 percent of each other. For each spiked product sample, the signal to noise ratio for the calibration standard peaks after complete extraction and cleanup must be 10:1 or greater. The recovery of the internal calibration standards in the extracted and cleaned up product samples must be within 50 to 150 percent of the amount spiked, and the results must be corrected for recovery. Subpart B—Specific Chemical Testing/Reporting Requirements § 766.20 Who must test. (a) Any person who manufactures, imports, or processes a chemical substance listed in § 766.25 must test that chemical substance and must submit appropriate information to EPA according to the schedules described in § 766.35. Chemical substances manufactured, imported or processed between January 1, 1984 and the date of promulgation of this part are subject to testing upon the effective date of this part. All other chemical substances are subject to testing immediately upon manufacture, import or processing. EPA expects that only manufacturers and importers will perform testing, and that the cost of testing will be passed on to processors through the pricing mechanism, thereby enabling them to share in the cost of testing. However, processors will be called upon to sponsor testing should manufacturers and importers fail to do so. A processor may apply for an exemption from testing upon certification to EPA that a manufacturer or importer is testing the chemical substance which that person processes. (b) If no manufacturer or importer described in § 766.20 submits a letter of intent to perform testing within the period described under § 766.35(a), or an exemption application under § 790.45(a), or a request for an exclusion or waiver under § 766.32, EPA will issue a notice in the Federal Register (c) If no manufacturer, importer or processor submits a letter of intent to perform testing of a specific chemical substance produced by a specific process, EPA will notify all manufacturers, importers, and processors, either by notice in the Federal Register (d) Manufacturers, importers, and processors who are subject to this part must comply with the test rule development and exemption procedures in part 790 of this chapter, except as modified in this part. § 766.25 Chemical substances for testing. (a) Listing of chemical substances. Note: For purposes of guidance only, EPA lists the chemical substances subject to testing under this part in two classes—those known to be manufactured or imported between January 1, 1984, and promulgation of this part, and those not known to be manufactured or imported at the time of promulgation of this part. (1) Chemicals substances known to be manufactured between January 1, 1984 and date of promulgation of this part. CAS No. Chemical name 79-94-7 Tetrabromobisphenol-A. 118-75-2 2,3,5,6-Tetrachloro-2,5-cyclohexadiene-1,4-dione. 118-79-6 2,4,6-Tribromophenol. 120-83-2 2,4-Dichlorophenol. 1163-19-5 Decabromodiphenyloxide. 4162-45-2 Tetrabromobisphenol-A-bisethoxylate. 21850-44-2 Tetrabromobisphenol-A-bis-2,3-dibromopropyl ether. 25327-89-3 Allyl ether of tetrabromobisphenol-A. 32534-81-9 Pentabromodiphenyloxide. 32536-52-0 Octabromodiphenyloxide. 37853-59-1 1,2-Bis(tribromophenoxy)-ethane. 55205-38-4 Tetrabromobisphenol-A diacrylate. (2) Chemicals not known to be manufactured between January 1, 1984 and the date of promulgation of this part. CAS No. Chemical name 79-95-8 Tetrachlorobisphenol-A. 87-10-5 3,4′,5-Tribromosalicylanilide. 87-65-0 2,6-Dichlorophenol. 95-77-2 3,4-Dichlorophenol. 95-95-4 2,4,5-Trichlorophenol. 99-28-5 2,6-Dibromo-4-nitrophenol. 120-36-5 2[2,4-(Dichlorophenoxy)]-propionic acid. 320-72-9 3,5-Dichlorosalicyclic acid. 488-47-1 Tetrabromocatechol. 576-24-9 2,3-Dichlorophenol. 583-78-8 2,5-Dichlorophenol. 608-71-9 Pentabromophenol. 615-58-7 2,4-Dibromophenol. 933-75-5 2,3,6-Trichlorophenol. 1940-42-7 4-Bromo-2,5-dichlorophenol. 2577-72-2 3,5-Dibromosalicylanilide. 3772-94-9 Pentachlorophenyl laurate. 37853-61-5 Bismethylether of tetrabromobisphenol-A. Alkylamine tetrachlorophenate. Tetrabromobisphenol-B. (b) Grade to be tested. § 766.27 Congeners and LOQs for which quantitation is required. Quantitation at the target LOQ shown for each of the following HDDs/HDFs which may be present in the chemical substances is required for the chemical substances listed under § 766.25. Analysis must take place for either chlorinated or brominated dibenzodioxins or dibenzofurans, whichever is predominantly expected to occur in the chemical substance to be tested. Only chlorinated and brominated congeners need be quantified; for chemical substances containing predominantly chlorine atoms, only congeners totally chlorinated at the numbered positions need be quantified; for chemical substances containing predominantly bromine atoms, only congeners totally brominated at the numbered positions need be quantified. Chlorinated dioxins Brominated dioxins LOQ 2,3,7,8-TCDD 2,3,7,8-TBDD 0.1 ppb. 1,2,3,7,8-PeCDD 1,2,3,7,8-PeBDD 0.5 ppb. 1,2,3,4,7.8-HxCDD 1,2,3,4,7,8-HxBDD 2.5 ppb. 1,2,3,6,7,8-HxCDD 1,2,3,6,7,8-HxBDD 2.5 ppb. 1,2,3,7,8,9-HxCDD 1,2,3,7,8,9-HxBDD 2.5 ppb. 1,2,3,4,6,7,8-HpCDD 1,2,3,4,6,7,8-HpBDD 100 ppb. 2,3,7,8-TCDF 2,3,7,8-TBDF 1 ppb. 1,2,3,7,8-PeCDF 1,2,3,7,8-PeBDF 5 ppb. 2,3,4,7,8-PeCDF 2,3,4,7,8-PeBDF 5 ppb. 1,2,3,4,7,8-HxCDF 1,2,3,4,7,8-HxBDF 25 ppb. 1,2,3,6,7,8-HxCDF 1,2,3,6,7,8-HxBDF 25 ppb. 1,2,3,7,8,9-HxCDF 1,2,3,7,8,9-HxBDF 25 ppb. 2,3,4,6,7,8-HxCDF 2,3,4,6,7,8-HxBDF 25 ppb. 1,2,3,4,6,7,8-HpCDF 1,2,3,4,6,7,8-HpBDF 1 ppm. 1,2,3,4,7,8,9-HpCDF 1,2,3,4,7,8,9-HpBDF 1 ppm. § 766.28 Expert review of protocols. EPA will gather a panel of experts in analysis of chemical matrices for HDDs/HDFs to review the protocols for testing submitted to EPA. The panel members will be employees of EPA and/or of other U.S. Government agencies who have had experience in analysis of chemical matrices and/or chemical wastes for HDDs/HDFs. The panel will recommend to the Director, EPA Office of Pollution Prevention and Toxics, whether the protocol submitted is likely to allow analysis down to the target LOQs, or if not, whether the protocol represents a good faith effort on the part of the tester to achieve the lowest possible LOQs. The final determination to accept or reject the protocol will be made by the Director, Office of Pollution Prevention and Toxics. EPA will review the submitted protocols as rapidly as possible and will complete the review within 90 days after receipt. EPA may require submission of revised protocols. Comments and recommendations will be transmitted to the submitter, and if revisions are required, a final protocol must be submitted to EPA within 90 days after EPA transmits such recommendations. § 766.32 Exclusions and waivers. (a) Reasons for exclusions and waivers. (1) Exclusions may be granted if. (ii) Process and reaction conditions of the chemical substance such that no HDDs/HDFs could be produced under those conditions; (2) Waivers may be granted if. (ii) In the judgement of EPA, the cost of testing would drive the chemical substance off the market, or prevent resumption of manufacture or import of the chemical substance, if it is not currently manufactured, and the chemical substance will be produced so that no unreasonable risk will occur due to its manufacture, import, processing, distribution, use, or disposal. (In this case, the manufacturer must submit to EPA all data supporting the determination.) (iii) Waivers may be appropriately conditioned with respect to such factors as time and conditions of manufacture or use. The grade of decabromodiphenyl oxide produced by Dow Chemical Company (Dow) for the National Toxicology Program (NTP) bioassay on that chemical is excluded from the testing requirement under this part. Provided, however, that this exclusion will not apply if Dow fails to supply to EPA within 60 days of the effective date of this section evidence showing which grade was used for the NTP bioassay. (b) Timing. (c) Publication. Federal Register (d) Decision. § 766.35 Reporting requirements. (a) Letters of intent, exemption applications, and protocols Letters of intent. (ii) Persons who commence manufacture, import or processing of a chemical substance listed under § 766.25 that has not been manufactured, imported or processed between January 1, 1984 and the effective date of this part must submit under § 790.45 of this chapter, within 60 days after the commencement of manufacture, import, or processing of the chemical substance, a letter of intent to test or an exemption application. (iii) Persons who commence manufacture, import or processing of a chemical substance listed under § 766.25 between the effective date of this part and the end of the reimbursement period for that particular chemical substance produced by a specific process must submit under § 790.45 of this chapter, within 60 days after the commencement of manufacture, import or processing of the chemical substance, a letter of intent to test or an exemption application. (2) Protocols. (A) The protocols for each chlorinated chemical substance produced by each process to be tested must be submitted to EPA no later than 12 months after the effective date of this part. (B) The protocol for each brominated chemical substance produced by each process to be tested must be submitted to EPA no later than 24 months after the effective date of this part except for the following chemicals. ( 1 ( 2 ( 3 ( 4 (ii) For chemical substances produced by a specific process not manufactured or processed as of the effective date of this part, a person who begins manufacture and submits a notice of intent to test must submit protocols for the test as follows: (A) Except as noted for the submitter and substance specified in the following table, protocols for testing must be submitted 12 months after manufacture or importation begins for chlorinated chemical substances. CAS No. Submitter Chemical Due date 118-75-2 Rhone-Poulenc 2,3,5,6-tetrachloro-2,5-cyclohexaniene-1,4-dione March 4, 1994 (B) Protocols for testing must be submitted 24 months after manufacture begins for brominated chemical substances. (iii) For persons who have been granted exemptions, waivers or exclusions from testing, protocols must be submitted 12 months after expiration of the exemption, waiver or exclusion for chlorinated chemical substances, and 24 months after expiration of the exemption, waiver or exclusion for brominated chemical substances. (b) Information that must be submitted to EPA. (2) Any manufacturer or importer of a chemical substance listed in § 766.25 in possession of unpublished health and safety studies on HDDs/HDFs is required to submit copies of such studies to EPA no later than October 5, 1987 or 90 days after the person first manufactures or imports the chemical substance, whichever is later. The following provisions of part 716 of this chapter apply to submission of these studies: §§ 716.3, 716.10(a) (1) and (4); 716.20(a) (1), (2), (3), (4), (7), (8) and (10); 716.25; 716.30; 716.35(a) (1), (2), and (4) [if applicable]; 716.35 (b) and (c); 716.40 (a) and (b); 716.50; 716.55; and 716.60(a)(2). (3) No later than October 5, 1987 or 90 days after the person first manufactures or imports the substance listed in § 766.25, any manufacturer or importer of a chemical substance listed in § 766.25 must submit records required to be held under part 717 of this chapter on any HDDs/HDFs. (4) Test results. CAS No. Submitter Chemical Due Date Effective Date 79-94-7 Great Lakes Tetrabromobisphenol-A May 26, 1992 May 28, 1993 79-94-7 Ethyl Tetrabromobisphenol-A August 10, 1992 May 28, 1993 79-94-7 Ameribrom Tetrabromobisphenol-A April 15, 1994 September 29, 1995 87-10-5 Pfister 3,4′,5-tribromosalicylanilide 45 days after protocol approval May 28, 1993 118-75-2 Rhone-Poulenc Inc. 2,3,5,6-tetrachloro-2,5-cyclohexadiene-1,4-dione July 5, 1996 June 30, 1997 118-79-6 Great Lakes 2,4,6-Tribromophenol May 26, 1992 May 28, 1993 1163-19-5 Ameribrom Decabromodiphenyloxide April 15, 1994 September 29, 1995 1163-19-5 Ethyl Decabromodiphenyloxide May 26, 1992 May 28, 1993 1163-19-5 Great Lakes Decabromodiphenyloxide May 26, 1992 May 28, 1993 4162-45-2 Great Lakes Tetrabromobisphenol-A-bisethoxylate June 2, 1993 September 8, 1994 25327-89-3 Great Lakes Allyl Ether of Tetrabromobisphenol-A August 10, 1992 May 28, 1993 32534-81-9 Great Lakes Pentabromodiphenyloxide March 22, 1993 September 8, 1994 32534-81-9 Akzo Chemicals Inc. Pentabromodiphenyloxide February 6, 1995 September 29, 1995 32534-81-9 Ameribrom Pentabromodiphenyloxide March 22, 1993 September 8, 1994 32536-52-0 Ameribrom Octabromodiphenyloxide January 8, 1993 September 29, 1995 32536-52-0 Ethyl Octabromodiphenyloxide May 15, 1994 May 28, 1993 32536-52-0 Great Lakes Octabromodiphenyloxide May 26, 1992 May 28, 1993 37853-59-1 Great Lakes 1,2-bis(tribromophenoxy)ethane January 24, 1995 September 29, 1995 (ii) For purposes of reporting test results to EPA, and for further reporting triggered by a positive test result under § 766.35(c), a positive test result is defined at § 766.3. (iii) Reporting of test results must follow procedures set out in part 790 of this chapter, except as modified in this part. (c) Information required to be submitted to EPA after submission of a positive test result. (i) A completed form (EPA 7710-51) for that chemical substance. The form and instructions are available online at http://www.epa.gov/oppt/chemtest/ereporting/index.html. (ii) Health and safety studies for the chemical substance for which a positive test result has been reported. The following provisions of part 716 of this chapter apply to submission of these studies: §§ 716.3; 716.10 (a) (1), (2), (3) and (4); 716.20; 716.25; 716.30; 716.35(a) (1), (2), and (4), [if applicable]; 716.35 (b) and (c); 716.40 (a) and (b); 716.50; 716.55; 716.60(a)(2). (iii) Copies of records on the chemical substances required to be held under part 717 of this chapter. (2) If a positive test result on a chemical substance is received from one person but not from others, EPA may issue a notice in the Federal Register (d)-(e) [Reserved] (f) Effective date. 1 2 3 4 (2) The effective date for paragraph (a)(2)(i)(B) introductory text, (a)(2)(i)(B)( 1 2 4 3 (3) The guidelines and other test methods cited in this rule are referenced as they exist on the effective date of the final rule. [52 FR 21437, June 5, 1987, as amended at 56 FR 23229, May 21, 1991; 57 FR 24960, June 12, 1992; 58 FR 30991, May 28, 1993, 58 FR 34205, June 23, 1993; 59 FR 46356, Sept. 8, 1994; 60 FR 31922, June 19, 1995; 60 FR 50433, Sept. 29, 1995; 60 FR 56955, Nov. 13, 1995; 62 FR 35105, June 30, 1997; 78 FR 72829, Dec. 4, 2013] § 766.38 Reporting on precursor chemical substances. (a) Identification of precursor chemical substances. CAS No. Chemical name 85-22-3 Pentabromoethylbenzene. 87-61-6 1,2,3-Trichlorobenzene. 87-84-3 1,2,3,4,5-Pentabromo-6-chloro-cyclohexane. 89-61-2 1,4-Dichloro-2-nitrobenzene. 89-64-5 4-Chloro-2-nitrophenol. 89-69-0 2,4,5-Trichloronitrobenzene. 92-04-6 2-Chloro-4-phenylphenol. 94-74-6 4-Chloro-o-toloxy acetic acid. 94-81-5 4-(2-Methyl-4-chlorophenoxy) butyric acid. 95-50-1 o-Dichlorobenzene. 95-56-7 o-Bromophenol. 95-57-8 o-Chlorophenol. 95-88-5 4-Chlororesorcinol. 95-94-3 1,2,4,5-Tetrachlorobenzene. 97-50-7 5-Chloro-2,4-dimethoxyaniline. 99-30-9 2,6-Dichloro-4-nitroaniline. 99-54-7 1,2-Dichloro-4-nitrobenzene. 106-46-7 p-Dichlorobenzene. 108-70-3 1,3,5-Trichlorobenzene. 108-86-1 Bromobenzene. 108-90-7 Chlorobenzene. 117-18-0 1,2,4,5-Tetrachloro-3-nitrobenzene. 120-82-1 1,2,4-Trichlorobenzene. 348-51-6 o-Chorofluorobenzene. 350-30-1 3-Chloro-4-fluoronitrobenzene. 615-67-8 Chlorohydroquinone. 626-39-1 1,3,5-Tribromobenzene. 827-94-1 2,6-Dibromo-4-nitroaniline. (b) Persons required to report. (c) Data to be reported. [52 FR 21437, June 5, 1987, as amended at 60 FR 31922, June 19, 1995]