[Federal Register Volume 59, Number 17 (Wednesday, January 26, 1994)]
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[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-1618]


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[Federal Register: January 26, 1994]


_______________________________________________________________________

Part VI





Environmental Protection Agency





_______________________________________________________________________




Thirty-Third Report of the TSCA Interagency Testing Committee to the 
Administrator; Receipt of Report and Request for Comments; Notice
=======================================================================
-----------------------------------------------------------------------

ENVIRONMENTAL PROTECTION AGENCY

[OPPTS-41040; FRL-4750-9]

 
Thirty-Third Report of the TSCA Interagency Testing Committee to 
the Administrator; Receipt of Report and Request for Comments

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice.

-----------------------------------------------------------------------

SUMMARY: The TSCA Interagency Testing Committee (ITC), established 
under section 4(e) of the Toxic Substances Control Act (TSCA), 
transmitted its Thirty-Third Report to the Administrator of EPA on 
November 29, 1993. As noted in this Report, which is included with this 
notice, the ITC revised the Priority Testing List by removing 2 
chemicals and 4 chemical groups from the List for priority 
consideration by the EPA Administrator for promulgation of test rules 
under section 4(a) of the Act. The chemicals being removed are 2,4-
dinitrophenol and 3,4-dimethylphenol. The groups being removed are 
imidazolium and ethoxylated quaternary ammonium compounds (8 
chemicals), brominated flame retardants (23 chemicals), and alkyl 
phosphates (20 chemicals). The Report indicates that removal of these 
chemicals and chemical groups from the List should be interpreted only 
as a reordering of priorities and not a statement that the testing 
recommended earlier has been completed or is not needed. Prior to 
removing chemicals from the List, the ITC reviewed about 80 TSCA 
section 8(a) reports and 850 TSCA section 8(d) studies. The ITC is 
sharing summaries of these reviews with appropriate EPA programs 
offices and other concerned Federal agencies to assist them in risk 
assessment and management activities.
    There are no additions to the Priority Testing List.
    EPA invites interested persons to submit written comments on the 
Report.

DATES: Written comments on the Thirty-third ITC Report should be 
submitted by February 25, 1994.

ADDRESSES: Send six copies of written submissions to: TSCA Docket 
Receipts (7407), Office of Pollution Prevention and Toxics, 
Environmental Protection Agency, Rm. ET G-99, 401 M St., SW., 
Washington, DC 20460. Submissions should bear the document control 
number (OPPTS-41040; FRL-4750-9). The public record supporting this 
action, including comments, is available for public inspection in Rm. 
ET G-102 at the address noted above from 12:00 noon to 4 p.m., Monday 
through Friday, except legal holidays.

FOR FURTHER INFORMATION CONTACT: Susan B. Hazen, Director, 
Environmental Assistance Division (7408), Office of Pollution 
Prevention and Toxics, Environmental Protection Agency, 401 M Street, 
SW., Rm. E-543B, Washington, DC 20460, (202) 554-1404, TDD (202) 554-
0551.

SUPPLEMENTARY INFORMATION: EPA has received the TSCA Interagency 
Testing Committee's Thirty-Third Report to the Administrator.

I. Background

    TSCA (Pub. L. 94-469, 90 Stat. 2003 et seq; 15 U.S.C. 260l et seq.) 
authorizes the Administrator of EPA to promulgate regulations under 
section 4(a) requiring testing of chemicals and chemical groups in 
order to develop data relevant to determining the risks that such 
chemicals and chemical groups may present to health or the environment. 
Section 4(e) of TSCA established the Interagency Testing Committee to 
recommend chemicals and chemical groups to the Administrator of EPA for 
priority testing consideration. Section 4(e) directs the ITC to revise 
the TSCA section 4(e) Priority Testing List at least every 6 months. 
The most recent revisions to this List are included in the ITC's 
Thirty-Third Report. The Report was received by the Administrator on 
November 29, 1993, and is included in this Notice. The Report removes 
two chemicals and four chemical groups from the TSCA section 4(e) 
Priority Testing List.
    These chemical substances and chemical groups were previously added 
to the TSCA section 8(d) Health and Safety Data Reporting Rule (40 CFR 
part 716) in response to the ITC testing recommendations. These 
substances will be considered for removal from the 8(d) rule during the 
next 8(d) rule ``biennial review,'' scheduled to occur during 1995. See 
40 CFR 716.65(b).

II. Written and Oral Comments

    EPA invites interested persons to submit detailed comments on the 
ITC's Report. All submissions should bear the identifying docket number 
(OPPT-41040).

III. Status of List

    The ITC's Thirty-Third Report notes the removal of 2 chemicals and 
4 chemical groups from the Priority Testing List. The current TSCA 
section 4(e) Priority Testing List contains 16 chemicals and 12 
chemical groups, with two chemical groups and 7 chemicals designated 
for testing.

    Authority: 15 U.S.C. 2603.

    Dated: January 11, 1994.

Charles M. Auer,
Director, Chemical Control Division, Office of Pollution Prevention and 
Toxics.

Thirty-Third Report Of The TSCA Interagency Testing Committee To 
The Administrator, U.S. Environmental Protection Agency

    Summary: This is the 33rd Report of the TSCA Interagency Testing 
Committee (ITC) to the Administrator of the U.S. Environmental 
Protection Agency (EPA). The ITC is revising its Priority Testing List 
by removing two chemicals and four chemical groups. The chemicals being 
removed are 2,4-dinitrophenol and 3,4-dimethylphenol. The groups being 
removed are imidazolium and ethoxylated quaternary ammonium compounds, 
brominated flame retardants, and alkyl phosphates. These revisions are 
based on current priorities of ITC Member agencies and a review of 
production and exposure reports and health and safety studies submitted 
by manufacturers, processors, and distributors for these chemicals and 
chemical groups.

I. Background

    The TSCA Interagency Testing Committee (ITC) was established by 
subsection 4(e) of the Toxic Substances Control Act (TSCA) ``to make 
recommendations to the Administrator respecting the chemical substances 
and mixtures to which the Administrator should give priority 
consideration for the promulgation of a rule for testing under 
subsection 4(a)... At least every 6 months..., the Committee shall make 
such revisions in the List as it determines to be necessary and to 
transmit them to the Administrator together with the Committee's 
reasons for the revisions'' (Public Law 94-469, 90 Stat. 2003 et seq., 
15 U.S.C. 2601 et seq.). Since its creation in 1976, the ITC has 
submitted 32 semi-annual Reports to the EPA Administrator transmitting 
the Priority Testing List and its revisions. These Reports have been 
published in the Federal Register and are available from the ITC. The 
ITC meets monthly and produces its revisions with the help of staff and 
technical contract support provided by EPA. ITC membership and support 
personnel are listed at the end of this Report.
    Following receipt of the ITC's Report, the EPA's Office of 
Pollution Prevention and Toxics may promulgate TSCA subsection 8(a) and 
8(d) rules that require manufacturers, processors, and/or distributors 
of chemicals on the Priority Testing List to submit production and 
exposure data (8a), and health and safety studies (8d), within 2 months 
of the rules' effective dates. The submissions are indexed and 
maintained by EPA. The ITC reviews the 8(a) and 8(d) information and 
other available data on chemicals and chemical groups to determine if 
revisions to the Priority Testing List are necessary. Revisions include 
changing a recommendation to a designation for action by the 
Administrator within 12 months, modifying the recommended testing, or 
removing the chemical or group from the List.
    The substituted phenols were recommended for testing in 1990 and 
the chemical groups were added to the Priority Testing List following 
the Committee's 1986 sixth scoring exercise (Ref. 1). The sixth scoring 
exercise was a systematic, computerized chemical selection procedure 
for identifying chemicals of concern, further defined by chemical 
substructural features (Ref. 5).

II. Revisions to the TSCA Section 4(e) Priority Testing List

    The ITC removes the following chemicals and chemical groups from 
the TSCA Section 4(e) Priority Testing List (Table 1). 

  Table 1.--Chemicals and chemical groups removed from the TSCA Section 
             4(e) Priority Testing List in ITC's 33rd Report            
------------------------------------------------------------------------
     CAS No.          Chemical/Group           Action            Date   
------------------------------------------------------------------------
51-28-5...........  2,4-Dinitrophenol..  Remove Previously         11/93
                                          Recommended                   
                                          Chemical.                     
                                                                        
95-65-8...........  3,4-Dimethylphenol.  Remove Previously        11/93 
                                          Recommended                   
                                          Chemical.                     
------------------------------------------------------------------------
                                                                        
                      Imidazolium and    Remove Previously         11/93
                         ethoxylated      Recommended                   
                         quaternary       Chemical Group.               
                     ammonium compounds                                 
                                                                        
68122-86-1........  Imidazolium                                         
                     compounds, 4,5-                                    
                     dihydro-1-methyl-.                                 
                                                                        
68153-35-5........  Ethanaminium, 2-                                    
                     amino-N-(2-                                        
                     aminoethyl).                                       
                                                                        
68389-88-8........  Poly(oxy-1,2-                                       
                     ethanediyl), a-[2-                                 
                     [bis(2-aminoethyl)-                                
                      methylammonio]-                                   
                     ethyl]--                                 
                     hydroxy-,N,N'-                                     
                     dicoco acyl)                                       
                     derivs., methyl                                    
                     sulfates (salts).                                  
                                                                        
68389-89-9........  Poly(oxy-1,2-                                       
                     ethanediyl), a-[2-                                 
                     [bis(2-aminoethyl)-                                
                      methylammonio]-                                   
                     ethyl]--                                 
                     hydroxy-,N,N'-                                     
                     bis(hydrogenated                                   
                     tallow acyl)                                       
                     derivs., methyl                                    
                     sulfates (salts).                                  
                                                                        
68410-69-5........  Poly(oxy-1,2-                                       
                     ethanediyl), a-[2-                                 
                     [bis(2-aminoethyl)-                                
                      methylammonio]-                                   
                     ethyl]--                                 
                     hydroxy-, N,N'-                                    
                     ditallow acyl                                      
                     derivs., methyl                                    
                     sulfates (salts).                                  
                                                                        
68413-04-7........  Poly(oxy-1,2-                                       
                     ethanediyl), a-[2-                                 
                     [bis(2-aminoethyl)-                                
                      methylammonio]-                                   
                     methylethyl]-                                      
                     -hydroxy-                                
                     , N,N'-di tallow                                   
                     acyl derivs.,                                      
                     methyl sulfates                                    
                     (salts).                                           
                                                                        
68554-06-3........  Poly(oxy-1,2-                                       
                     ethanediyl), a-[3-                                 
                     [bis(2-aminoethyl)-                                
                      methylammonio]-2-                                 
                     hydroxypropyl]-                                    
                     -hydroxy-                                
                     , N- coco acyl                                     
                     derivs., methyl                                    
                     sulfates (salts).                                  
                                                                        
70914-09-9........  Poly(oxy-1,2-                                       
                     ethanediyl), a-[2-                                 
                     [bis(2-aminoethyl)-                                
                      methylammonio]-                                   
                     ethyl]--                                 
                     hydroxy-, N,N'-di-                                 
                     C14-16 acyl                                        
                     derivs., methyl                                    
                     sulfates (salts) .                                 
------------------------------------------------------------------------
                                                                        
                      Brominated flame   Remove Previously         11/93
                        retardants a      Recommended                   
                                          Chemical Group.               
                                                                        
118-79-6..........  2,4,6-                                              
                     Tribromophenol.                                    
                                                                        
632-79-1..........  Tetrabromophthalic                                  
                     anhydride.                                         
                                                                        
3296-90-0.........  Dibromoneopentyl                                    
                     glycol.                                            
                                                                        
32588-76-4........  Ethylene                                            
                     bis(tetrabromophth                                 
                     alimide).                                          
                                                                        
41291-34-3........  Ethylene bis(5,6-                                   
                     dibromonorbornane-                                 
                     2,3-                                               
                     dicarboximide).                                    
                                                                        
57137-10-7........  Tribrominated                                       
                     polystyrene.                                       
                                                                        
61262-53-1........  Ethylene                                            
                     bis(pentabromophen                                 
                     oxide).                                            
                                                                        
                      Brominated flame   Remove Previously         11/93
                        retardants a      Recommended                   
                                          Chemical Group.               
                                                                        
74-97-5...........  Bromochloromethane.                                 
                                                                        
87-10-5...........  3,4',5-                                             
                     Tribromosalicylani                                 
                     lide.                                              
                                                                        
87-83-2...........  2,3,4,5,6-                                          
                     Pentabromotoluene.                                 
                                                                        
87-84-3...........  1,2,3,4,5-                                          
                     Pentabromo-6-                                      
                     chlorocyclohexane.                                 
                                                                        
96-13-9...........  2,3-Dibromopropanol                                 
                                                                        
593-60-2..........  Vinyl bromide......                                 
                                                                        
615-58-7..........  2,4-Dibromophenol..                                 
                                                                        
4162-45-2.........  Ethoxylated                                         
                     tetrabromobispheno                                 
                     l A.                                               
                                                                        
25327-89-3........  Tetrabromobisphenol                                 
                     A, bis(allyl                                       
                     ether).                                            
                                                                        
30554-72-4........  Tetrabromodichloroc                                 
                     yclohexane.                                        
                                                                        
30554-73-5........  Tribromotrichlorocy                                 
                     clohexane.                                         
                                                                        
36483-57-5........  Tribromoneopentyl                                   
                     alcohol.                                           
                                                                        
55205-38-4........  Tetrabromobisphenol                                 
                     A diacrylate.                                      
                                                                        
68955-41-9........  Alkanes, C10-C16,                                   
                     bromochloro.                                       
                                                                        
69882-11-7........  2,4-(or 2,6)-                                       
                     Dibromophenol,                                     
                     homopolymer.                                       
                                                                        
88497-56-7........  Benzene, ethenyl-,                                  
                     homopolymer,                                       
                     brominated.                                        
------------------------------------------------------------------------
                                                                        
                      Alkyl phosphates   Remove Previously         11/93
                                          Recommended                   
                                          Chemical Group.               
                                                                        
78-40-0...........  Triethyl phosphate.                                 
                                                                        
78-42-2...........  Tris(2-ethylhexyl)                                  
                     phosphate.                                         
                                                                        
78-51-3...........  Tris(2-butoxyethyl)                                 
                     phosphate.                                         
                                                                        
107-66-4..........  Di-n-butyl                                          
                     phosphate.                                         
                                                                        
126-71-6..........  Triisobutyl                                         
                     phosphate.                                         
                                                                        
126-73-8..........  Tri-n-butyl                                         
                     phosphate.                                         
                                                                        
298-07-7..........  Di(2-ethylhexyl)                                    
                     phosphate.                                         
                                                                        
812-00-0..........  Monomethyl                                          
                     phosphate.                                         
                                                                        
1070-03-7.........  Mono(2-ethylhexyl)                                  
                     phosphate.                                         
                                                                        
1498-51-7.........  Ethyl                                               
                     dichlorophosphate.                                 
                                                                        
1623-15-0.........  n-Butyl phosphate..                                 
                                                                        
1623-24-1.........  Monoisopropyl                                       
                     phosphate.                                         
                                                                        
2958-09-0.........  Monooctadecyl                                       
                     phosphate.                                         
                                                                        
3900-04-7.........  Monohexyl phosphate                                 
                                                                        
3991-73-9.........  Monooctyl phosphate                                 
                                                                        
7057-92-3.........  Di-n-dodecyl                                        
                     phosphate.                                         
                                                                        
7332-46-9.........  2-(2-                                               
                     Butoxyethoxy)ethan                                 
                     ol phosphate (3:1).                                
                                                                        
12645-31-7........  2-Ethylhexyl                                        
                     phosphate.                                         
                                                                        
12751-23-4........  Dodecyl phosphate..                                 
                                                                        
27215-10-7........  Diisooctyl                                          
                     phosphate .                                        
------------------------------------------------------------------------
a Brominated flame retardants were recommended as 2 groups in the 25th  
  Report (7 chemicals) and 26th Report (16 chemicals).                  

III. Rationale for the revisions

A. ITC's Activities During this Reporting Period

    During the 6 months covered by this Report, May through October 
1993, the ITC reviewed the 8(a) and 8(d) submissions and other 
available data for chemicals and chemical groups recommended in its 
22nd, 23rd, 25th, 26th, and 27th Reports. The Federal Register 
citations for the 8(a) and 8(d) rules and the number of 8(d) studies 
reviewed by the ITC for each chemical or chemical group are summarized 
in the following Table 2. Approximately 80 TSCA 8(a) reports were 
reviewed by the ITC; but the exact number is not reported for each 
chemical or group to protect TSCA Confidential Business Information. 

 Table 2.-- Number of TSCA section 8(d) studies reviewed by the ITC for 
      chemicals and chemical groups discussed in this 33rd Report       
------------------------------------------------------------------------
                          TSCA Section 8(a) and                         
    Chemical/Group       8(d) Rules FR Citations       8(d) Studies     
                                                                        
------------------------------------------------------------------------
2,4-Dinitrophenol......  56 FR 42688, August 29,  13                    
                          1991.                                         
3,4-Dimethylphenol.....  56 FR 42688, August 29,  13                    
                          1991.                                         
Imidazolium and          53 FR 18211, May 20,     90                    
 ethoxylated quaternary   1988.                                         
 ammonium compounds.                                                    
Brominated flame         54 FR 51131, December    192                   
 retardants a.            12, 1989.                                     
Brominated flame         55 FR 39780, September   268                   
 retardants a.            28, 1990.                                     
Alkyl phosphates.......  55 FR 39780, September   313                   
                          28, 1990.                                     
------------------------------------------------------------------------
a Brominated flame retardants were recommended as two groups in the 25th
  and 26th Reports.                                                     

    Also during this reporting period, the ITC reevaluated the priority 
for testing these chemicals and chemical groups at the urging of EPA in 
view of current EPA and Member agency priorities. The ITC has 
determined that the chemicals and groups listed in its recent Reports 
are of higher priority than some of the chemicals recommended in 
earlier Reports and is reordering priorities to reflect this 
determination. For the chemicals removed from the List, the ITC will 
forward to the appropriate EPA program office(s), or other Federal 
Government organizations, its review of 8(d) studies and other relevant 
information to assist them in risk assessment and management 
activities, regulatory actions, or for renomination to the TSCA section 
4(e) Priority Testing List. The ITC will also include these TSCA 8(d) 
summary reports in the public docket supporting this ITC Report. In 
those cases in which the testing recommendations originally made by the 
ITC have not been met, the ITC encourages manufacturers, processors, 
and distributors of the removed chemicals to conduct voluntary testing 
programs to provide the recommended test data.

B. Specific Rationales

    1. 2,4-Dinitrophenol and 3,4-Dimethylphenol. These substituted 
phenols were nominated to the ITC by EPA in June 1990 and added to the 
Priority Testing List in November 1990. Chemical fate, health effects 
and ecological effects testing were recommended as described in the 
ITC's 27th Report to the EPA Administrator (56 FR 9534, March 6, 1991). 
The rationale for recommending health effects testing of these 
chemicals was to provide needed test data to increase the confidence 
for EPA's Reference Concentrations (RfC) and Reference Doses (RfD). The 
rationale for recommending chemical fate and ecological effects testing 
was to provide data that could be used by EPA to assess ecological 
risk.
    Based on a review of 8(d) studies for these chemicals, the 
recommended testing has not been conducted. However, the ITC decided 
that these testing recommendations are currently of relatively lower 
priority than others and removes these chemicals from the Priority 
Testing List.
    2. Imidazolium and ethoxylated quaternary ammonium compounds. 
Imidazolium and ethoxylated quaternary ammonium compounds were 
recommended for health effects, chemical fate and ecological effects 
testing in the ITC's 22nd Report (53 FR 18196, May 20, 1988). The major 
concerns were for long-term dermal consumer exposure, toxicity to 
aquatic organisms and persistence in aquatic environments. For this 
33rd Report, the ITC reviewed toxicity and exposure data summarized in 
the 22nd Report, data submitted to EPA under TSCA sections 8(a) and 
8(d) and reports from the Chemical Specialties Manufacturing 
Association (CSMA) describing structures, testing and uses of 
imidazolium and ethoxylated quaternary ammonium compounds in fabric 
softeners, and studies on health effects, chemical fate and ecological 
effects (Ref. 2, 3, and 4). After reviewing all these studies, the ITC 
concludes that there is no additional suspicion of health hazard or 
human exposure for these quaternary ammonium compounds and that 
potential effects to aquatic organisms are likely to be mitigated by 
the binding of these quaternary ammonium compounds to particulate 
organic carbon. For these reasons, the ITC believes that the previously 
recommended testing is not of sufficiently high priority at this time. 
The imidazolium and ethoxylated quaternary ammonium compounds are, 
therefore, being removed from the Priority Testing List. If, in the 
future, sufficient concerns arise regarding the health or ecological 
effects of these compounds, individual members of this group may be 
designated for testing.
    3. Brominated Flame Retardants. Two groups of brominated flame 
retardants were added to the Priority Testing List in November 1989 and 
May 1990. Chronic health and ecological effects and physical/chemical 
properties and persistence testing were recommended for a group of 
seven brominated flame retardants in the ITC's 25th Report (54 FR 
51114, December 12, 1989). Physical/chemical properties and persistence 
testing were recommended for a group of 16 brominated flame retardants 
in the ITC's 26th Report (55 FR 23050, June 5, 1990). Based on review 
of TSCA section 8(a) and 8(d) submissions, available production data 
and EPA's testing priorities, the ITC removes the brominated flame 
retardants from the Priority Testing List. The most recent, available 
production data reviewed by the ITC were submitted to EPA in response 
to the 1990 TSCA Inventory Update Rule (55 FR 39586, September 27, 
1990) and the 8(a) rules.
    Fifteen of the brominated flame retardants are being removed from 
the List because they are not known to be domestically produced or 
imported in substantial quantities. These include 3 from the 25th 
Report: ethylene bis(tetrabromophthalimide) (32588-76-4); ethylene 
bis(5,6-dibromonorbornane-2,3-dicarboximide) (41291-34-3) and ethylene 
bis(pentabromophenoxide) (61262-53-1) and 12 from the 26th Report: 
3,4',5-tribromo- salicylanilide (87-10-5); 2,3,4,5,6-pentabromotoluene 
(87-83-2); 1,2,3,4,5-pentabromo-6- chlorocyclohexane (87-84-3); 2,3-
dibromopropanol (96-13-9); 2,4-dibromophenol (615-58-7); ethoxylated 
tetrabromobisphenol A (4162-45-2); tetrabromobisphenol A bis(allyl 
ether) (25327-89-3); tetrabromodichlorocyclohexane (30554-72-4); 
tribromotrichlorocyclohexane (30554-73-5); tribromoneopentyl alcohol 
(36483-57-5); tetrabromobisphenol A diacrylate (55205-38-4) and 
C10-18 bromochloroalkanes (68955-41-9).
    Tribrominated polystyrene (57137-10-7) from the 25th Report; 2,4-
(or 2,6)- dibromophenol homopolymer (69882-11-7); and brominated 
polystyrene (88497-56-7) from the 26th Report are being removed from 
the List because they are polymers with a lower probability of 
absorption into biological tissues than nonpolymeric organic chemicals.
    Dibromoneopentyl glycol (3296-90-0) from the 25th Report as well as 
bromochloromethane (74-97-5) and vinyl bromide (593-60-2) from the 26th 
Report are being removed from the List because their health effects are 
reasonably well characterized and their occupational and environmental 
exposures can be estimated.
    2,4,6-Tribromophenol (118-79-6) and tetrabromophthalic anhydride 
(632-79-1) from the 25th Report are being removed from the List at this 
time to give adequate priority to recently identified testing needs for 
other chemicals.
    The ITC has prepared a report summarizing its review of the TSCA 
8(d) studies for transmittal to the EPA's Existing Chemical Program and 
other appropriate Federal Government organizations for possible risk 
assessment and management activities, regulatory actions, or for 
renomination to the TSCA section 4(e) Priority Testing List. This TSCA 
8(d) summary report is included in the public docket supporting this 
ITC Report.
    4. Alkyl phosphates. Twenty alkyl phosphates were added to the 
Priority Testing List in May 1990. Physical/chemical properties and 
persistence testing were recommended in the ITC's 26th Report to the 
Administrator (55 FR 23050, June 5, 1990).
    The following 13 alkyl phosphates are being removed from the 
Priority Testing List because they are not known to be domestically 
produced or imported in substantial quantities: dibutyl phosphate (107-
66-4), triisobutyl phosphate (126-71-6), monomethyl phosphate (812-00-
0), mono(2-ethylhexyl) phosphate (1070-03-7), monobutyl phosphate 
(1623-15-0), mono(isopropyl) phosphate (1623-24-1), monooctadecyl 
phosphate (2958-09-0), monohexyl phosphate (3900-04-7), monooctyl 
phosphate (3991-73-9), di-n-dodecyl phosphate (7057-92-3), 2-(2-
butoxy)ethanol phosphate (7332-46-9), dodecyl phosphate (12751-23-4) 
and diisooctyl phosphate (27215-10-7).
    Testing to provide physical/chemical properties and persistence 
data for tributyl phosphate (126-73-8) is being conducted under TSCA 
section 4 (54 FR, 33400, August 14, 1989). The remaining 6 alkyl 
phosphates have substantial production volumes: triethyl phosphate (78-
40-0), tris(2-ethylhexyl) phosphate (78-42-2), tris(2-butoxyethyl) 
phosphate (78-51-3), di(2-ethylhexyl) phosphate (298-07-7), ethyl 
dichlorophosphate (1498-51-7) and 2-ethylhexyl phosphate (12645-31-7). 
The ITC is removing them from the Priority Testing List because they 
are not of sufficiently high priority at this time.
    Dibutyl phosphate, which the ITC is removing from the Priority 
Testing List  because it is not substantially produced in the U.S., is 
currently being tested as part of the Organisation for Economic 
Cooperation and Development (OECD) Screening Information Data Set 
(SIDS) program. The six ``substantially-produced'' alkyl phosphates 
being removed from the List at this time are on OECD's High Production 
Volume list of chemicals and may be subject to SIDS testing in the 
future. Therefore, the ITC has forwarded a report summarizing its 
information on the alkyl phosphates to the U.S. representative to the 
OECD SIDS program. The ITC has prepared a report summarizing its review 
of the TSCA 8(d) studies to send to the EPA's Existing Chemical Program 
and other appropriate Federal Government organizations for possible 
risk assessment and risk management activities, regulatory actions, or 
for renomination to the TSCA section 4(e) Priority Testing List. This 
TSCA 8(d) summary report is included in the public docket supporting 
this ITC Report.

C. References

    (1) Brink, R.H. and Walker, J.D. TSCA Interagency Testing 
Committee sixth scoring exercise. U.S.EPA-68-02-4251. Office of 
Pollution Prevention and Toxics. Washington, DC (1987).
    (2) Chemical Specialties Manufacturing Association. ``Response 
to EPA's information needs on imidazolium quaternary ammonium 
compounds and ethoxylated quaternary ammonium compounds.'' OPTS 
Docket #41029, Washington, DC: OPPT, USEPA (1988).
    (3) Chemical Specialties Manufacturing Association. Additional 
information on imidazolium quaternary ammonium compounds and 
ethoxylated quaternary ammonium compounds.'' OPTS Docket #41029, 
Washington, DC: OPPT, USEPA (1993).
    (4) TSCA Interagency Testing Committee. Summary tables of TSCA 
section 8(d) studies for imidazolium and ethoxylated quaternary 
ammonium compounds. OPTS Docket #41029, Washington, DC: OPPT, USEPA 
(1993).
    (5) Walker, J.D. Chemical selection by the TSCA Interagency 
Testing Committee: Use of computerized substructure searching to 
identify chemical groups for health effects, chemical fate and 
ecological effects testing. Science of the Total Environment. 109/
110:691-700 (1991).

IV. The TSCA Section 4(e) Priority Testing List, as Revised 
November 1993

    The following chemicals and chemical groups remain on the Priority 
Testing List as revised by the ITC in November 1993.

      The TSCA Section 4(e) Priority Testing List (November 1993)       
------------------------------------------------------------------------
Report                                                                  
                Date             Chemical/Group            Action       
------------------------------------------------------------------------
23      November 1988.......  Butyraldehyde.......  Recommended.        
                                                                        
23      November 1988.......  Tetrakis(2-           Recommended with    
                               chloroethyl)ethylen   intent-to-         
                               e diphosphate.        designate.         
                                                                        
......  November 1988.......  Tris(1,3-dichloro-2-  Recommended with    
                               propyl) phosphate.    intent-to-         
                                                     designate.         
                                                                        
......  November 1988.......  Tris(1-chloro-2-      Recommended with    
                               propyl) phosphate.    intent-to-         
                                                     designate.         
                                                                        
......  November 1988.......  Tris(2-chloro-1-      Recommended with    
                               propyl) phosphate.    intent-to-         
                                                     designate.         
                                                                        
......  November 1988.......  Tris(2-chloroethyl)-  Recommended with    
                               phosphate.            intent-to-         
                                                     designate.         
                                                                        
26      May 1990............  Isocyanates.........  Recommended with    
                                                     intent-to-         
                                                     designate.         
                                                                        
27      November 1990.......  Acetophenone........  Designated.         
                                                                        
27      November 1990.......  Phenol..............  Designated.         
                                                                        
27      November 1990.......  N,N-Dimethylaniline.  Designated.         
                                                                        
27      November 1990.......  Ethylacetate........  Designated.         
                                                                        
27      November 1990.......  2,6-Dimethylphenol..  Designated.         
                                                                        
27      November 1990.......  Aldehydes...........  Recommended with    
                                                     intent-to-         
                                                     designate.         
                                                                        
27      November 1990.......  N-phenyl-1-           Recommended.        
                               naphthylamine.                           
                                                                        
27      November 1990.......  Sulfones............  Recommended.        
                                                                        
27      November 1990.......  Substantially         Recommended.        
                               produced chemicals                       
                               in need of                               
                               subchronic toxicity                      
                               testing.                                 
                                                                        
28      May 1991............  Acetone.............  Designated.         
                                                                        
28      May 1991............  Thiophenol..........  Designated.         
                                                                        
28      May 1991............  m-Dinitrobenzene....  Recommended.        
                                                                        
28      May 1991............  Cyanoacrylates......  Recommended.        
                                                                        
29      November 1991.......  White phosphorus....  Recommended.        
                                                                        
29      November 1991.......  Alkyl-, bromo-,       Recommended.        
                               chloro-,                                 
                               hydroxymethyl                            
                               diaryl ethers.                           
                                                                        
30      May 1992............  Siloxanes...........  Recommended.        
                                                                        
30      May 1992............  Chloroalkyl           Recommended.        
                               phosphates.                              
                                                                        
31      January 1993........  OSHA chemicals with   Designated.         
                               no dermal toxicity                       
                               data.                                    
                                                                        
31      January 1993........  Propylene glycol      Recommended.        
                               ethers and esters                        
                               (revised).                               
                                                                        
31      January 1993........  Methyl ethylene       Recommended.        
                               glycol ethers and                        
                               esters (revised).                        
                                                                        
32      May 1993............  OSHA chemicals with   Designated.         
                               insufficient dermal                      
                               absorption data.                         
------------------------------------------------------------------------


  TSCA Interagency Testing Committee Statutory Organizations and Their  
                            Representatives                             
------------------------------------------------------------------------
            Organization                            Member              
------------------------------------------------------------------------
  Council on Environmental Quality.  Vacant                             
                                                                        
   Department of Commerce..........  Willie E. May, Member              
                                     Edward White, Alternate            
                                                                        
   Environmental Protection Agency.  Dave Williams, Member              
                                     Lois Dicker, Alternate             
                                                                        
  National Cancer Institute........  Thomas P. Cameron, Member          
                                     Richard Adamson, Alternate         
                                                                        
  National Institute of              Errol Zeiger, Member               
   Environmental Health Sciences.                                       
                                                                        
  National Institute for             Robert W. Mason, Member            
   Occupational Safety and Health.   Henryka Nagy, Alternate            
                                                                        
  National Science Foundation......  Carter Kimsey, Member, Chair       
                                     Jarvis L. Moyers, Alternate        
                                                                        
  Occupational Safety and Health     Christine Whittaker, Member, Vice  
   Administration.                    Chair                             
                                     Surender Ahir, Alternate           
                                                                        
Liaison Organizations and Their                                         
 Representatives.                                                       
                                                                        
  Agency for Toxic Substances and    William Cibulas, Member            
   Disease Registry.                                                    
                                                                        
  Consumer Product Safety            Val Schaeffer, Member              
   Commission.                       Lakshmi C. Mishra, Alternate       
                                                                        
  Department of Agriculture........  Donald Derr, Member                
                                     Cliff Rice, Alternate              
                                                                        
  Department of Defense............  Randall S. Wentsel, Member         
                                                                        
  Department of the Interior.......  Jim Petty, Member                  
                                     Barnett A. Rattner, Alternate      
                                                                        
  Food and Drug Administration.....  Edwin J. Matthews, Member          
                                     Raju Kammula, Alternate            
                                                                        
  National Library of Medicine.....  Vera Hudson, Member                
                                                                        
  National Toxicology Program......  Victor A. Fung, Member             
                                                                        
                                                                        
Counsel............................  Mary Ellen Levine, Office of the   
                                      General Counsel, EPA              
                                                                        
                                                                        
Technical Support Contractor.......  Syracuse Research Corporation      
                                                                        
ITC Staff..........................  John D. Walker, Executive Director 
                                     Norma S.L. Williams, Executive     
                                      Assistant, TSCA Interagency       
                                      Testing Committee, U.S. EPA/OPPT  
                                      (7401) 401 M St., SW., Washington,
                                      D.C. 20460, (202) 260-1825.       
------------------------------------------------------------------------


[FR Doc. 94-1618 Filed 1-25-94; 8:45 am]
BILLING CODE 6560-50-F