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carbofuran (Furadan) Proposed Time-Limited Tolerance 10/94

Pesticide Tolerances for 2,3-Dihydro-2,2-Dimethyl-7-Benzofur

[Federal Register: November 8, 1994]




40 CFR Part 180

[OPP-300366; FRL-4919-4]
RIN 2070-AC18

Pesticide Tolerances for 2,3-Dihydro-2,2-Dimethyl-7-Benzofuranyl-

AGENCY: Environmental Protection Agency.

ACTION: Proposed rule.


SUMMARY: This document proposes to establish a time-limited tolerance 
for residues of the insecticide 2,3-dihydro-2,2-dimethyl-7-
benzofuranyl-N-methylcarbamate (common name ``carbofuran'') and its 
metabolites in or on canola at 1.00 part per million (ppm) with an 
expiration date of 2 years after the beginning of the effective date of 
a final rule based on this proposal. EPA is issuing this proposal on 
its own initiative.

DATES: Comments, identified by the document control number, [OPP-
300366], must be received on or before December 8, 1994.

ADDRESSES: Comments may be submitted to: Public Docket and Freedom of 
Information Section, Field Operations Division (7506C), Office of 
Pesticide Programs, 401 M St., SW., Washington, DC 20604. In person, 
bring comments to: Rm. 1128, CM #2, Arlington, VA 22202. Information 
submitted as a comment concerning this document may be claimed 
confidential by marking any part or all of that information 
``Confidential Business Information'' (CBI).
    Information so marked will not be disclosed except in accordance 
with procedures set forth in 40 CFR part 2. A copy of the comment that 
does not contain CBI must be submitted for inclusion in the public 
record. Information not marked confidential may be disclosed publicly 
by the EPA without prior notice. All written comments will be available 
for public inspection in Rm. 1128 at the address given below, from 8 
a.m. to 4 p.m., Monday through Friday, excluding legal holidays.

FOR FURTHER INFORMATION CONTACT: By mail: Dennis H. Edwards, Jr., 
Product Manager (PM) 19, Registration Division (7505C), Environmental 
Protection Agency, 401 M St., SW., Washington, DC 20460. Office 
location and telephone number: Rm. 207, CM #2, 1921 Jefferson Davis 
Hwy., Arlington, VA 22202, (703)-305-6386.

SUPPLEMENTARY INFORMATION: On its own initiative and pursuant to 
section 408(e) of the Federal Food, Drug, and Cosmetic Act (FFDCA), 21 
U.S.C. 346a(e), EPA is proposing a time-limited, regionally restricted 
tolerance for the residues of carbofuran on canola at 1.00 ppm. EPA is 
proposing the tolerance because at the present time, canola treated 
with carbofuran may not be processed in the U.S. and must be exported 
to Canada. There are currently three Special Local Need registrations 
under section 24(c) of the Federal Insecticide Fungicide, and 
Rodenticide Act, 7 U.S.C. 136v(c). Registrations will be regionally 
restricted to Idaho, Minnesota, Montana, North Dakota, and Washington.
    All relevant materials have been evaluated. The toxicology data 
considered in support of the tolerance include:
    1. A 2-year chronic feeding/oncogenicity study in the rat with a 
no-observed-effect level (NOEL) of 1.0 milligram (mg)/kilogram (kg) of 
body weight (bwt) per day (20 ppm) for cholinesterase-inhibition (CHE) 
and systemic effects, negative for oncogenic effects at the levels 
tested (0, 10, 20, and 100 ppm).
    2. A 2-year chronic feeding/oncogenicity study in the mouse with a 
NOEL of 3.0 mg/kg bwt/day (20 ppm) for CHE, a NOEL of 18.75 mg/kg bwt/
day (125 ppm) for systemic effects, and negative for oncogenic effects 
at all levels tested (0, 20, 125, and 500 ppm).
    3. A 1-year dog feeding study with a NOEL of 0.5 mg/kg (20 ppm).
    4. A three-generation rat reproduction study with a NOEL of 1.0 mg/
kg (20 ppm).
    5. Two rat teratology studies which were negative for teratogenic 
effects at up to 1.2 mg/kg bwt/day and 160 ppm and NOEL's for 
fetotoxicity of 1.2 mg/kg and 60 ppm.
    6. A rabbit teratology study which was negative for teratogenic and 
fetotoxic effects at 2.00 mg/kg and mutagenicity testing which showed 
carbofuran not to be mutagenic.
    There is no cancer risk associated with the use of this chemical. 
Carbofuran has not been shown to produce carcinogenic effects in two 
    The reference dose (RfD), based on a 1-year dog feeding study with 
a NOEL of 0.5 mg/kg bwt/day and an uncertainty factor of 100, is 
calculated to be 0.005 mg/kg bwt/day. The theoretical maximum residue 
contribution (TMRC) from the current tolerances is 0.005183 mg/kg/day. 
The percent reference dose (RfD) for the overall U.S. population is 
104, for nonnursing infants it is 263, and for children, ages 1-6, it 
is 238The proposed tolerance will add 0.000077 mg/kg/day to the TMRC 
and 1.5to the overall RfD. The dietary risk from all uses of 
carbofuran is overestimated since it was assumed that all residues are 
at tolerance level (anticipated residues were not used) and 10012f all 
crops were treated. Before any additional permanent tolerances will be 
considered, the RfD must be refined by use of anticipated residues and 
realistic percent crop treated values. The Agency will not establish 
any new tolerances for carbofuran until the TMRCs for the overall U.S. 
population and its subgroups are below the reference dose.
    The tolerance would be established for 2 years, with an expiration 
date of 2 years after the beginning of the effective date of a final 
rule based on this proposal. The Interregional Research Project No. 4 
(IR-4) is currently conducting new residue trials and plans to submit a 
petition for a permanent tolerance in early 1995. However, because of 
the known hazard to carbofuran to birds and wildlife, EPA will not 
establish a permanent tolerance until the Agency has fully evaluated 
risks to wildlife.
    The nature of the residue in plants and animals is adequately 
understood for the purposes of this time-limited tolerance. Adequate 
analytical methods for enforcement are available in the Pesticide 
Analytical Manual, Volume II (PAM II). Carbofuran, per se, is recovered 
under FDA's multiresidue protocols A and D.
    This pesticide is considered useful for the purposes for which the 
tolerance is sought. Based on the above information considered by the 
Agency, the tolerance established by amending 40 CFR part 180 would 
protect the public health. Therefore, it is proposed that the tolerance 
be established as set forth below.
    Any person who has registered or submitted an application for 
registration of a pesticide, under FIFRA, as amended, which contains 
any of the ingredients listed herein, may request within 30 days after 
publication of this document in the Federal Register that this 
rulemaking proposal be referred to an Advisory Committee in accordance 
with FFDCA section 408(e).
    Interested persons are invited to submit written comments on the 
proposed regulation. Comments must bear notation indicating the 
document control number, [OPP-300366]. All written comments filed in 
response to this document will be available in the Public Docket and 
Freedom of Information Section, at the address given above from 8 a.m. 
to 4 p.m., Monday through Friday, except legal holidays.
    Pursuant to the requirements of the Regulatory Flexibility Act 
(Pub. L. 96-354, 94 Stat. 1164, 5 U.S.C. 601-612), the Administrator 
has determined that regulations establishing exemptions from tolerance 
requirements do not have a significant economic impact on a substantial 
number of small entities. A certification statement of this effect was 
published in the Federal Register of May 4, 1981 (46 FR 24950).

List of Subjects in 40 CFR Part 180

    Environmental protection, Administrative practice and procedure, 
Agricultural commodities, Pesticides and pests, Recording and 
recordkeeping requirements.

Dated: October 27, 1994.

Stephen L. Johnson,
Director, Registration Division, Office of Pesticide Programs.

    Therefore, it is proposed that 40 CFR part 180 be amended as 


    1. The authority citation for part 180 continues as follows:

    Authority: 21 U.S.C. 346a and 371.

    2. In Sec. 180.254, by adding new paragraph (c), to read as 

Sec. 180.254   2,3-Dihydro-2,2-dimethyl-7-benzofuranyl-N-
methylcarbamate; tolerances for residues.

*        *        *        *        *
    (c) A time-limited tolerance (of 2 years) with regional 
registration, as defined in Sec. 180.1(n), is established for the 
combined residues of the insecticide carbofuran (2,3-dihydro-2,2-
dimethyl-7-benzofuranyl-N-methylcarbamate), its carbamate metabolite-
and its phenolic metabolites 2,3-dihydro-2,2-dimethyl-7-benzofuranol, 
2,3-dihydro-2,2-dimethyl-3-oxo-7-benzofuranol and 2,3-dihydro-2,2-
dimethyl-3,7-benzofurandiol in or on the following raw agricultural 

                                                              Parts per 
                         Commodity                             million  
Canola (of which no more than 0.2 ppm is carbamate)........         1.00

[FR Doc. 94-27704 Filed 11-3-94; 4:47 pm]