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Pesticide Tolerance for 1-[[2-(2,4-Dichlorophenyl)-4-Propyl-1,3- Dioxolan-2-yl]Methyl]-1H-1,2,4-Triazole
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
[Federal Register: June 12, 1996 (Volume 61, Number 114)]
[Rules and Regulations]
[Page 29672-29674]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr12jn96-23]
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ENVIRONMENTAL PROTECTION AGENCY
40 CFR Part 180
[PP 2F4086/R2238; FRL-5368-4]
RIN 2070-AB78
Pesticide Tolerance for 1-[[2-(2,4-Dichlorophenyl)-4-Propyl-1,3-
Dioxolan-2-yl]Methyl]-1H-1,2,4-Triazole
AGENCY: Environmental Protection Agency (EPA).
ACTION: Final rule.
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SUMMARY: This rule establishes a tolerance for combined residues of the
fungicide 1-[[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-
yl]methyl]-1H-1,2,4-triazole and its metabolites determined as 2,4-
dichlorobenzoic acid and expressed as parent compound in or on the raw
agricultural commodities oat grain at 0.1 parts per million (ppm), oat
straw at 1.0 ppm, oat forage at 10.0 ppm, and oat hay at 30.0 ppm. The
regulation to establish a maximum permissible level for residues of the
fungicide was requested in a petition submitted by Ciba-Geigy Corp.
EFFECTIVE DATE: This regulation becomes effective June 12, 1996.
ADDRESSES: Written objections and hearing requests, identified by the
document control number, [PP 2F4086/R2238], may be submitted to:
Hearing Clerk (1900), Environmental Protection Agency, Rm. M3708, 401 M
St., SW., Washington, DC 20460. A copy of any objections and hearing
requests filed with the Hearing Clerk should be identified by the
document control number and submitted to: Public Response and Program
Resources Branch, Field Operations Division (7506C), Office of
Pesticide Programs, Environmental Protection Agency, 401 M St., SW.,
Washington , DC 20460. In person, bring copy of objections and hearing
requests to Rm. 1132, CM #2, 1921 Jefferson Davis Hwy., Arlington, VA
22202. Fees accompanying objections shall be labeled ``Tolerance
Petition Fees'' and forwarded to: EPA Headquarters Accounting
Operations Branch, OPP (Tolerance Fees), P.O. Box 360277M, Pittsburgh,
PA 15251.
An electronic copy of objections and hearing requests filed with
the Hearing Clerk may be submitted to OPP by sending electronic mail
(e-mail) to: opp-docket@epamail.epa.gov.
Copies of electronic objections and hearing requests must be
submitted as an ASCII file avoiding the use of special characters and
any form of encryption. Copies of electronic objections and hearing
requests will also be accepted on disks in WordPerfect 5.1 file format
or ASCII file format. All copies of electronic objections and hearing
requests must be identified by the docket number [PP 2F4086/R2238] . No
Confidential Business Information (CBI) should be submitted through e-
mail. Copies of electronic objections and hearing requests on this rule
may be filed online at many Federal Depository Libraries. Additional
information on electronic submissions can be found below in this
document.
FOR FURTHER INFORMATION CONTACT: By mail: Connie B. Welch, Product
Manager (PM) 21, Registration Division (7505C), Office of Pesticide
Programs, Environmental Protection Agency, 401 M St., SW., Washington,
DC 20460. Office location and telephone number: Rm. 227, CM #2, 1921
Jefferson Davis Highway, Arlington, VA 22202 (703) 305-6226; e-mail:
welch.connie@epamail.epa.gov.
SUPPLEMENTARY INFORMATION: EPA issued a notice (FRL-4971-5), published
in the Federal Register of November 15, 1995 (60 FR 57420), which
announced that Ciba-Geigy Corp., P.O. Box 18300, Greensboro, NC 27419
had submitted pesticide petition (PP) 2F4086 to EPA requesting that the
Administrator, pursuant to section 408(d) of the Federal Food, Drug,
and Cosmetic Act (FFDCA), 21 U.S.C. 346a(d ), establish tolerances for
combined residues of the fungicide 1-[[2-(2,4-dichlorophenyl)-4-propyl-
1,3-dioxolan-2-yl]methyl]-1H -1,2,4-triazole in or on the raw
agricultural commodities oat grain at 0.1 ppm, oat straw at 1.0 ppm,
oat forage at 10.0 ppm, and oat hay at 30.0 ppm.
There were no comments received in response to the notice of
filing.
The scientific data submitted in the petition and other relevant
material have been evaluated. The data considered in support of the
tolerance include:
1. Plant and animal metabolism studies.
2. Residue data for crop and livestock commodities.
3. Two enforcement methods and multiresidue method testing data.
4. A 90-day rat feeding study with a no-observable-effect level
(NOEL) of 12 mg/kg/day.
5. A 90-day dog feeding study with a NOEL of 1.25 mg/kg/day.
6. A rabbit developmental toxicity study with a maternal NOEL of
100 mg/kg/day and a developmental toxicity NOEL of Greater than 400 mg/
kg/day (highest dose tested) (HDT)).
7. A rat teratology study with a maternal NOEL of 30 mg/kg/day and
a developmental toxicity NOEL of 30 mg/kg/day.
8. A 2-generation rat reproduction study with a reproductive NOEL
of 125 mg/kg/day (HDT) and a developmental toxicity NOEL of 25 mg/kg/
day.
9. A 1-year dog feeding study with a NOEL of 1.25 mg/kg/day.
10. A 2-year rat chronic feeding/carcinogenicity study with a NOEL
of 5 mg/kg/day with no carcinogenic potential under the conditions of
the study up to and including approximately 125 mg/kg/day, the highest
dose tested.
11. A 2-year mouse chronic feeding/carcinogenicity study with a
NOEL of 15 mg/kg/day and with a statistically significant increase in
combined adenomas and carcinomas of the liver in male mice at
approximately 375 mg/kg/day, the highest dose tested.
12. Ames test with and without activation, negative.
13. A mouse dominant-lethal assay, negative.
14. Chinese hamster nucleus anomaly, negative.
15. Cell transformation assay, negative.
Ciba-Geigy submitted information which resolved the previously
outstanding concerns about the nature of the residue in ruminants, an
explanation of recovery calculations, and an explanation of the crop
field trial protocol. Data gaps exist concerning dosing in the mouse
carcinogenicity study. These data requirements were required under
reregistration, pursuant to the Federal Insecticide, Fungicide, and
Rodenticide Act (FIFRA), 7 U.S.C. 136 et seq.
As part of EPA's evaluation of potential human health risks, 1-
[[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl]methyl]-1H- 1,2,4-
triazole has been the subject of five Peer Reviews and one Scientific
Advisory Panel (SAP) meeting.
The fungicide 1-[[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-
yl]methyl]-1H-1,2,4-triazole was originally evaluated by the Peer
Review Committee on January 15, 1987, and classified as a Group C
(possible human) carcinogen with a recommendation made for the
quantification of estimated potential human risk using a linearized
low-dose extrapolation. The method resulted in the establishment of a
Q* of 7.9 x 10-2 (mg/kg/day)-1.
The Peer Review Committee's decision was presented to the FIFRA
Scientific Advisory Panel on March 2, 1988. The Panel did not concur
with the committee's overall assessment of the
[[Page 29673]]
weight-of-evidence on the carcinogenicity of 1-[[2-(2,4-
dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl]methyl]-1H-1,2,4-triazole.
The Panel recommended placing the chemical in Group D, indicating that
the Group C classification was based on minimal evidence. The Panel's
determination that EPA's Group C classification was based on minimal
evidence was due to the fact that the incidence of liver tumors in male
mice only occurred when the mice were given an excessive chemical dose.
As part of a fifth Peer Review, EPA considered additional
information provided by the registrant in support of the registrant's
argument that the high dose was excessively toxic in the mouse
carcinogenicity study. It further argued that the data from the high
dose (2,500 ppm) should not be included in the evaluation of
carcinogenic potential of -[[2-(2,4-dichlorophenyl)-4-propyl-1,3-
dioxolan-2-yl]methyl]-1H-1,2,4-triazole. In support of these arguments,
the registrant provided two subchronic oral toxicity studies in mice.
Ciba-Geigy also provided a reread of the pathology slides from a mouse
oncogenicity study which it felt indicated sufficient concurrent liver
toxicity at 2,500 ppm to document that this dose was excessive. These
findings were not present in the original pathology report. Owing to
the inconsistency in Ciba-Geigy's report and the original report, the
Agency requested that an independent (third) evaluation of the
pathology slides be made to determine if the pathology reported could
be confirmed. The results of this (third) pathology evaluation were
used in the fifth Peer Review in place of data resulting from the
earlier evaluations provided by Ciba-Geigy.
The Peer Review Committee considered the following facts regarding
the toxicology data on 1-[[2-(2,4-dichlorophenyl)-4- propyl-1,3-
dioxolan-2-yl]methyl]-1H-1,2,4-triazole in a weight-of-evidence
determination of carcinogenic potential:
1. Increased numbers of adenomas (increased trend and pairwise
comparison) were found in the livers of male CD1 mice given 2,500 ppm
of 1-[[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl]methyl]-1H-
1,2,4-triazole in their diet.
2. The treated animals had earlier fatalities than the controls.
3. The numbers of carcinomas were increased (trend only) in male
mice only at the 2,500 ppm dose level. Tumors were not significantly
increased at the 500 ppm dose level. Adenomas observed in the treated
animals were larger and more numerous than those in controls; however,
the tumor type (adenoma) was the same.
4. No excessive number of tumors was found in female mice.
5. In a rat study conducted with acceptable doses of 1-[[2-(2,4-
dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl]methyl]-1H-1,2, 4-triazole,
no excessive numbers of tumors were found.
The Peer Review Committee determined, based on the additional
information submitted by Ciba-Geigy from two 90-day subchronic studies
in mice that the 2,500 ppm dose used in the 2-year chronic study
exceeded the maximum tolerated dose (MTD) based on the endpoint of
hepatic necrosis, and the 500 ppm dose used in the chronic study was
inadequate to assess the carcinogenicity of 1-[[2-(2,4-dichlorophenyl)-
4-propyl-1,3-dioxolan-2-yl]methyl]-1H-1,2,4-triazole. Based on the
third pathology evaluation of the chronic study, the Peer Review
Committee disagreed with Ciba-Geigy's argument that the study showed
excessive toxicity at the 2,500 ppm dose. However, the Peer Review
Committee concluded that the 90-day subchronic studies are a better
measure of what would be an MTD.
Based upon these findings, the Peer Review Committee agreed that
the classification for 1-[[2-(2,4-dichlorophenyl)-4-propyl-1,3-
dioxolan-2-yl]methyl]-1H-1,2,4-triazole should remain a Group C
(possible human) carcinogen and recommended against the previously used
Q* (viz. 0.079) for risk assessment purposes. For the purpose of
risk characterization the Peer Review Committee recommended that the
reference dose (RfD) approach should be used for quantification of
human risk. This decision was based on the disqualification of the high
dose (2,500 ppm), making the data inappropriate for the calculation of
Q*. Because the middle dose (500 ppm) was not considered
sufficiently high enough for assessing the carcinogenic potential of 1-
[[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl]methyl]-1H-1,2,4-
triazole, EPA has requested an additional mouse study at intermediate
dose levels in male mice only. EPA does not expect that these data will
significantly change the above cancer assessment that 1-[[2-(2,4-
dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl]methyl]-1H-1,2,4-triazole
poses a negligible risk to humans.
The reference dose for 1-[[2-(2,4-dichlorophenyl)-4-propyl- 1,3-
dioxolan-2-yl]methyl]-1H-1,2,4-triazole is 0.013 mg/kg/day, and based
on a NOEL of 1.25 mg/kg/day and an uncertainty factor of 100. The NOEL
is taken from a 1-year dog feeding study that demonstrated irritation
of the stomach in males as an endpoint effect. The Anticipated Residue
Contribution (ARC) from the current action is estimated at 0.000872 mg/
kg/day and utilizes 7% of the RfD of the general population of the 48
states. The ARC for the most highly exposed subgroup, non-nursing
infants less than 1 year old is 0.00405 or mg/kg/day (31% of the RfD).
The nature of the residue in plants and animals is adequately
understood and an adequate analytical method, gas chromatography, is
available for enforcement purposes. Adequate animal tissue, milk, and
egg tolerances exist to cover secondary residues incurred in those
commodities from the proposed uses.
The enforcement methodology has been submitted to the Food and Drug
Administration for publication in the Pesticide Analytical Manual,
Volume II (PAM II). Because of the long lead time for publication of
the method in PAM II, the analytical methodology is being made
available in the interim to anyone interested in pesticide enforcement
when requested from: Calvin Furlow, Public Response and Program
Resources Branch, Field Operations Division (7506C), Office of
Pesticide Programs, Environmental Protection Agency, 401 M St., SW.,
Washington, DC 20460. Office location and telephone number: Rm. 1132,
CM #2, 1921 Jefferson Davis Highway, Arlington, VA 22202 (703) 305-5232.
There are presently no actions pending against the continued
registration of this chemical. The pesticide is considered useful for
the purpose for which the tolerance is sought.
Based on the information and data considered, the Agency has
determined that the tolerance established by amending 40 CFR part 180
will protect the public health. Therefore, the tolerance is established
as set forth below.
Any person adversely affected by this regulation may, within 30
days after publication of this document in the Federal Register, file
written objections to the regulation and may also request a hearing on
those objections. Objections and hearing requests must be filed with
the Hearing Clerk, at the address given above (40 CFR 178.20). A copy
of the objections and/or hearing requests filed with the Hearing Clerk
should be submitted to the OPP docket for this rulemaking. The
objections submitted must specify the provisions of the regulation
deemed objectionable and the grounds for the objections (40 CFR
178.25). Each objection must be
[[Page 29674]]
accompanied by the fee prescribed by 40 CFR 180.33(i). If a hearing is
requested, the objections must include a statement of the factual
issue(s) on which a hearing is requested, the requestor's contentions
on such issues, and a summary of any evidence relied upon by the
objector (40 CFR 178.27). A request for a hearing will be granted if
the Administrator determines that the material submitted shows the
following: There is genuine and substantial issue of fact; there is a
reasonable possibility that available evidence identified by the
requestor would, if established, resolve one or more of such issues in
favor of the requestor, taking into account uncontested claims or facts
to the contrary; and resolution of the factual issue(s) in the manner
sought by the requestor would be adequate to justify the action
requested (40 CFR 178.32).
A record has been established for this rulemaking under the docket
number [PP 2F4086/R2238] (including any comments and data submitted
electronically). A public version of this record, including printed,
paper versions of electronic comments, which does not include any
information claimed as CBI, is available for inspection from 8 a.m. to
4 p.m., Monday through Friday, excluding legal holidays. The public
record is located in Room 1132 of the Public Response and Program
Resources Branch, Field Operations Division (7506C), Office of
Pesticide Programs, Environmental Protection Agency, Crystal Mall #2,
1921 Jefferson Davis Highway, Arlington, VA.
The official record for this rulemaking, as well as the public
version, as described above will be kept in paper form. Accordingly,
EPA will transfer any copies of objections and hearing requests
received electronically into printed, paper form as they are received
and will place the paper copies in the official rule-making record
which will also include all comments submitted directly in writing. The
official rulemaking record is the paper record maintained at the
address in ``ADDRESSES'' at the beginning of this document.
Under Executive Order 12866 (58 FR 51735, October 4, 1993), the
Agency must determine whether the regulatory action is ``significant''
and therefore subject to all the requirements of the Executive Order
(i.e., Regulatory Impact Analysis, review by the Office of Management
and Budget (OMB)). Under section 3(f), the order defines
``significant'' as those actions likely to lead to a rule (1) having an
annual effect on the economy of $100 million or more, or adversely and
materially affecting a sector of the economy, productivity,
competition, jobs, the environment, public health or safety, or State,
local or tribal governments or communities (also known as
``economically significant''); (2) creating serious inconsistency or
otherwise interfering with an action taken or planned by another
agency; (3) materially altering the budgetary impacts of entitlement,
grants, user fees, or loan programs; or (4) raising novel legal or
policy issues arising out of legal mandates, the President's
priorities, or the principles set forth in this Executive Order.
Pursuant to the terms of this Executive Order, EPA has determined
that this rule is not ``significant'' and is therefore not subject to
OMB review.
This action does not impose any enforceable duty, or contain any
``unfunded mandates'' as described in Title II of the Unfunded Mandates
Reform Act of 1995 (Pub. L. 104-4), or require prior consultation as
specified by Executive Order 12875 (58 FR 58093, October 28, 1993),
entitled Enhancing the Intergovernmental Partnership, or special
consideration as required by Executive Order 12898 (59 FR 7629,
February 16, 1994).
Pursuant to the requirements of the Regulatory Flexibility Act
(Pub. L. 9-354, 94 Stat. 1164, 5 U.S.C. 601-612), the Administrator has
determined that regulations establishing new tolerances or raising
tolerance levels or establishing exemptions from tolerance requirements
do not have a significant economic impact on a substantial number of
small entities. A certification statement to 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, Reporting and
recordkeeping requirements.
Dated: May 23, 1996.
Stephen L. Johnson,
Director, Registration Division, Office of Pesticide Programs.
Therefore, 40 CFR part 180 is amended as follows:
PART 180--[AMENDED]
1. The authority citation for part 180 continues to read as follows:
Authority: 21 U.S.C. 346a and 371.
2. In Sec. 180.434, by revising the introductory text to paragraph
(a) and by adding alphabetically the entries for ``oats, grain,''
``oats, straw,'' ``oats, forage,'' and ``oats, hay'' to the table in
paragraph (a), to read a follows:
Sec. 180.434 1-[[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-
yl]methyl]-1H-1,2,4-triazole; tolerances for residues.
(a) Tolerances are established for the combined residues of the
fungicide 1-[[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl]
methyl]-1H-1,2,4-triazole and its metabolites determined as 2,4-
dichlorobenzoic acid and expressed as parent compound in or on the
following raw agricultural commodities:
------------------------------------------------------------------------
Parts per
Commodity million
------------------------------------------------------------------------
* * * * *
Oats, grain................................................ 0.1
Oats, straw................................................ 1.0
Oats, forage............................................... 10.0
Oats, hay.................................................. 30.0
* * * * *
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* * * * *
[FR Doc. 96-14452 Filed 6-11-96; 8:45 am]
BILLING CODE 6560-50-F