[Federal Register Volume 60, Number 153 (Wednesday, August 9, 1995)]
[Rules and Regulations]
[Pages 40498-40500]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-19528]



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ENVIRONMENTAL PROTECTION AGENCY
40 CFR Part 180

[PP 9F3818/R2153; FRL-4970-3]
RIN 2070-AB78


Tebuconazole; Pesticide Tolerances

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

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SUMMARY: This rule establishes tolerances for residues of the fungicide 
tebuconazole (alpha-[2-(4-chlorophenyl)-ethyl]-alpha-(1,1-
dimethylethyl)-1H-1,2,4-triazole-1-ethanol) for seed treatment in or on 
the raw agricultural commodities barley grain, forage, hay, and straw 
at 0.05, 0.10, 0.10, 0.10 parts per million (ppm), respectively; oat 
grain, forage, hay, and straw at 0.05, 0.10, 0.10, and 0.10 ppm, 
respectively; and wheat grain, forage, hay, and straw at 0.05, 0.10, 
0.10, 0.10 ppm, respectively. Miles, Inc. (formerly Mobay Corp., 
Agricultural Chemicals Division, now Bayer Corp.) submitted a petition 
pursuant to the Federal Food, Drug, and Cosmetic Act (FFDCA) for the 
regulation to establish a maximum permissible level for residues of the 
fungicide.

EFFECTIVE DATE: This regulation becomes effective August 9, 1995.

ADDRESSES: Written objections and hearing requests, identified by the 
document control number, [PP 9F3818/R2153], may be submitted to: 
Hearing Clerk (1900), Environmental Protection Agency, Rm. M3708, 401 M 
St., SW., Washington, DC 20460. 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. 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.
    A copy of any objections and hearing requests filed with the 
Hearing Clerk may also be submitted electronically by sending 
electronic mail (e-mail) to: [email protected]. Copies of 
objections and hearing requests must be submitted as an ASCII file 
avoiding the use of special characters and any form of encryption. 
Copies of objections and hearing requests will also be accepted on 
disks in WordPerfect in 5.1 file format or ASCII file format. All 
copies of objections and hearing requests in electronic form must be 
identified by the document number [PP 9F3818/R2153]. No Confidential 
Business Information (CBI) should be submitted through e-mail. 
Electronic copies of 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 Hwy., Arlington, VA 22202, (703)-305-6226; e-mail: 
[email protected].

SUPPLEMENTARY INFORMATION: EPA issued a notice, published in the 
Federal Register of June 15, 1995 (60 FR 31465), which announced that 
Miles, Inc., Agricultural Division (formerly Mobay Corp., Agricultural 
Chemicals Division, now Bayer Corp.), P.O. Box 4913, Kansas City, MO 
64120-0013, had submitted pesticide petition (PP) 9F3818 to EPA 
requesting that the Administrator, pursuant to section 408(d) of the 
FFDCA, 21 U.S.C. 346a(d), establish a tolerance for residues of the 
fungicide tebuconazole (alpha-[2-(4-chlorophenyl)-ethyl]-alpha-(1,1-
dimethylethyl)-1H-1,2,4-triazole-1-ethanol) for seed treatment in or on 
the raw agricultural commodities barley grain, forage, hay, and straw 
at 0.05, 0.10, 0.10, 0.10 ppm, respectively; oat grain, forage, hay, 
and straw at 0.05, 0.10, 0.10, and 0.10 ppm, respectively; and wheat 
grain, forage, hay, and straw at 0.05, 0.10, 0.10, and 0.10 ppm, 
respectively.
    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 toxicological data considered in 
support of the tolerance include:
    1. A 90-day rat feeding study with a no-observed-effect level 
(NOEL) of 34.8 milligrams per kilogram of body weight per day (mg/kg 
bw/day) (400 ppm) and a lowest-effect-level (LEL) of 171.7 mg/kg bw/day 
(1,600 ppm) in males, based on decreased body weight gains and 
histological changes in the adrenals. For females, the NOEL was 10.8 
mg/kg bw/day (100 ppm), and the LEL was 46.5 mg/kg bw/day (400 ppm) 
based on decreased body weights, decreased body weight gains, and 
histological changes in the adrenals.
    2. A 90-day dog feeding study with a NOEL of 200 ppm (73.7 mg/kg 
bw/day in males and 73.4 mg/kg bw/day in females) and an LEL of 1,000 
ppm (368.3 mg/kg bw/day in males and 351.8 mg/kg bw/day in females). 
The LEL was based on decreases in mean body weights, body weight gains, 
and food consumption, and an increase in liver N-demethylase activity.
    3. A 1-year dog feeding study with a NOEL of 1 mg/kg bw/day (40 
ppm) and an LEL of 5 mg/kg bw/day (200 ppm), based on lenticular and 
corneal opacity and hepatic toxicity in either sex (the current 
Reference Dose was determined based on this study). A subsequent 1-year 
dog feeding study, using lower doses to further define the NOEL for 
tebuconazole, defines a systemic LOEL of 150 ppm (based on adrenal 
effects in both sexes) and a systemic NOEL of 100 ppm.
    4. A 2-year rat chronic feeding study defined, a NOEL of 7.4 mg/kg 
bw/day (100 ppm) and a LEL of 22.8 mg/kg bw/day (300 ppm) based on body 
weight 

[[Page 40499]]
depression, decreased hemoglobin, hematocrit, MCV and MCHC, and 
increased liver microsomal enzymes in females. Tebuconazole was not 
oncogenic at the dose levels tested (0, 100, 300, and 1,000 ppm).
    5. A rat oral developmental toxicity study with a maternal NOEL of 
30 mg/kg bw/day and an LEL of 60 mg/kg bw/day based on elevation of 
absolute and relative liver weights. For developmental toxicity, a NOEL 
of 30 mg/kg bw/day and an LEL of 60 mg/kg bw/day was determined, based 
on delayed ossification of thoracic, cervical, and sacral vertebrae, 
sternum, fore and hind limbs and increase in supernumerary ribs.
    6. A rabbit oral developmental toxicity study with a maternal NOEL 
of 30 mg/kg bw/day and an LEL of 100 mg/kg bw/day based on depression 
of body weight gains and food consumption. A developmental NOEL of 30 
mg/kg bw/day and an LEL of 100 mg/kg bw/day were based on increased 
postimplantation losses, from both early and late resorptions and frank 
malformations in eight fetuses of five litters.
    7. A mouse oral developmental toxicity study with a maternal NOEL 
of 10 mg/kg bw/day and an LEL of 20 mg/kg bw/day based on a 
supplementary study indicating reduction in hematocrit and histological 
changes in liver. A developmental NOEL of 10 mg/kg bw/day and an LEL of 
30 mg/kg bw/day based on dose-dependent increases in runts/dam at 30 
and 100 mg/kg bw/day.
    8. A mouse dermal developmental toxicity study with a maternal NOEL 
of 30 mg/kg bw/day and a LEL of 60 mg/kg bw/day based on a 
supplementary study indicating increased liver microsomal enzymes and 
histological changes in liver. The NOEL for developmental toxicity in 
the dermal study in the mouse is 1,000 mg/kg bw/day, the highest dose 
tested (HDT).
    9. A two-generation rat reproduction study with a dietary maternal 
NOEL of 15 mg/kg bw/day (300 ppm) and a LEL of 50 mg/kg bw/day (1,000 
ppm) based on depressed body weights, increased spleen hemosiderosis, 
and decreased liver and kidney weights. A reproductive NOEL of 15 mg/kg 
bw/day (300 ppm) and an LEL of 50 mg/kg bw/day (1,000 ppm) were based 
on neonatal birth weight depression.
    10. An Ames mutagenesis study in Salmonella that showed no 
mutagenicity with or without metabolic activation.
    11. A micronucleus mutagenesis assay study in mice that showed no 
genotoxicity.
    12. A sister chromatid exchange mutagenesis study using CHO cells 
that was negative at dose levels 4 to 30 ug/mL without activation or 15 
to 120 ug/mL with activation.
    13. An unscheduled DNA synthesis (UDS) study that was negative for 
UDS in rat hepatocytes.
    Additionally, a mouse oncogenicity study at dietary levels of 0, 
20, 60, and 80 ppm for 21 months did not reveal any oncogenic effect 
for tebuconazole at any dose tested. Because the Maximum Tolerated Dose 
(MTD) was not reached in this study, the study was classified as 
supplementary. A followup mouse study at higher doses (0, 500, 1,500 
ppm in the diet), with an MTD at 500 ppm, revealed statistically 
significant incidences of hepatocellular adenomas and carcinomas in 
males and carcinomas in females. The initial and followup studies, 
together with supplementary data submitted by Miles, Inc., were 
classified as core minimum.
    The Office of Pesticide Programs' Health Effects Division's 
Carcinogenicity Peer Review Committee (CPRC) has classified 
tebuconazole as a Group C carcinogen (possible human carcinogen). This 
classification is based on the Agency's ``Guidelines for Carcinogen 
Risk Assessment'' published in the Federal Register of September 24, 
1986 (51 FR 33992). The Agency has chosen to use the reference dose 
calculations to estimate human dietary risk from tebuconazole residues. 
The decision supporting classification of tebuconazole as a possible 
carcinogen (Group C) rather than a probable carcinogen (Group B) was 
primarily based on the statistically significant increase in the 
incidence of hepatocellular adenomas, carcinomas, and combined 
adenomas/carcinomas in both sexes of NMRI mice both by positive trend 
and pairwise comparison at the HDT, and the structural correlation with 
at least six other related triazole pesticides that produce liver 
tumors.
    The Reference Dose (RfD) is established at 0.01 mg/kg of body 
weight (bwt)/day, based on a no-observed-effect level (NOEL) of 1.00 
mg/kg bwt/day and an uncertainty factor of 100. The NOEL is based on a 
1-year dog feeding study that demonstrated lenticular and corneal 
opacity and hepatic toxicity as an endpoint effect. A chronic exposure 
analysis was performed using tolerance level residues and 100 percent 
crop treated information to estimate the Theoretical Maximum Residue 
Contribution (TMRC) for the general population and 22 subgroups. The 
Theoretical Maximum Residue Contribution (TMRC) from the current action 
is estimated at 0.000078 mg/kg bwt/day and utilizes 0.78% of the RfD 
for the general population of the 48 States. The TMRC for the most 
highly exposed subgroup, nonnursing infants (less than 1 year old), is 
estimated at 0.000097 mg/kg/day and utilizes less than 1% of the RfD.
    The nature of the residue in barley, oats, and wheat is adequately 
understood. An adequate analytical method using high-performance liquid 
chromatography is available for enforcement purposes.
    The enforcement methodology has been submitted to the Food and Drug 
Administration for publication in the Pesticide Analytical Manual, Vol. 
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 Hwy., Arlington, VA 22202, (703)-305-5232.
    Tolerances for tebuconazole in or on animal commodities are not 
currently required.
    There are currently no actions pending against the continued 
registration of this chemical.
    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 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 

[[Page 40500]]
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 docket 
number, [PP 9F3818/R2153] (including objections and hearing requests 
submitted electronically as described below). 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 4:30 p.m., Monday through Friday, excluding 
legal holidays. The public record is located in Rm. 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 Hwy., Arlington, VA.
    Written objections and hearing requests, identified by the document 
control number, [PP 9F3818/R2153], may be submitted to: Hearing Clerk 
(1900), Environmental Protection Agency, Rm. 3708, 401 M St., SW., 
Washington, DC 20460.
    A copy of electronic objections and hearing requests can be sent 
directly to EPA at:
    [email protected].
    A copy of electronic objections and hearing requests may be 
submitted as an ASCII file avoiding the use of special characters and 
any form of encryption.
    The official record for this rulemaking, the public version, as 
described above will be kept in paper form. Accordingly, EPA will 
transfer any objections and hearing requests received electronically 
into printed, paper form as they are received and will place the paper 
copies in the official rulemaking record which will also include all 
objections and hearing requests 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.
    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 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: July 28, 1995.

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. 180.474, by revising the table therein, to read as 
follows:


Sec. 180.474   Tebuconazole (alpha-[2-(4-chlorophenyl)-ethyl]-alpha-
(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol); tolerances for 
residues.

* * * * *

------------------------------------------------------------------------
                                                              Parts per 
                         Commodity                             million  
------------------------------------------------------------------------
                                                                        
Bananas....................................................         0.05
Barley, forage.............................................         0.10
Barley, grain..............................................         0.05
Barley, hay................................................         0.10
Barley, straw..............................................         0.10
Oat, forage................................................         0.10
Oat, grain.................................................         0.05
Oat, hay...................................................         0.10
Oat, straw.................................................         0.10
Peanuts....................................................          0.1
Peanut, hulls..............................................          4.0
Wheat, forage..............................................         0.10
Wheat, grain...............................................         0.05
Wheat, hay.................................................         0.10
Wheat, straw...............................................         0.10
                                                                        
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[FR Doc. 95-19528 Filed 8-8-95; 8:45 am]

BILLING CODE 6560-50-F