[Federal Register Volume 61, Number 114 (Wednesday, June 12, 1996)]
[Rules and Regulations]
[Pages 29672-29674]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-14452]



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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: [email protected].
    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: 
[email protected].

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