Hexythiazox; Notice of Filing a Pesticide Petition to Establish a Tolerance for a Certain Pesticide Chemical in or on Food, 31455-31459 [05-10843]

Agencies

• ENVIRONMENTAL PROTECTION AGENCY

[Federal Register Volume 70, Number 104 (Wednesday, June 1, 2005)]
[Notices]
[Pages 31455-31459]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 05-10843]


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ENVIRONMENTAL PROTECTION AGENCY

[OPP-2005-0114; FRL-7711-8]


Hexythiazox; Notice of Filing a Pesticide Petition to Establish a 
Tolerance for a Certain Pesticide Chemical in or on Food

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice.

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SUMMARY: This notice announces the initial filing of a pesticide 
petition (PP) proposing the establishment of regulations for residues 
of a certain pesticide chemical in or on various food commodities.

DATES: Comments, identified by docket identification (ID) number OPP-
2005-0114, must be received on or before July 1, 2005.

ADDRESSES: Comments may be submitted electronically, by mail, or 
through hand delivery/courier. Follow the detailed instructions as 
provided in Unit I. of the SUPPLEMENTARY INFORMATION.

FOR FURTHER INFORMATION CONTACT: Bonaventure Akinlosotu, Registration 
Division (7505C), Office of Pesticide Programs, Environmental 
Protection Agency, 1200 Pennsylvania Ave., NW., Washington, DC 20460-
0001; telephone number: (703) 605-0653; e-mail address: 
akinlosotu.bonaventure@epa.gov.

SUPPLEMENTARY INFORMATION:

I. General Information

A. Does this Action Apply to Me?

    You may be potentially affected by this action if you are an 
agricultural producer, food manufacturer, or pesticide manufacturer. 
Potentially affected entities may include, but are not limited to:
     Crop production (NAICS 111)
     Animal production (NAICS 112)
     Food manufacturing (NAICS 311)
     Pesticide manufacturing (NAICS 32532)

[[Page 31456]]

    This listing is not intended to be exhaustive, but rather provides 
a guide for readers regarding entities likely to be affected by this 
action. Other types of entities not listed in this unit could also be 
affected. The North American Industrial Classification System (NAICS) 
codes have been provided to assist you and others in determining 
whether this action might apply to certain entities. If you have any 
questions regarding the applicability of this action to a particular 
entity, consult the person listed under FOR FURTHER INFORMATION 
CONTACT.

B. How Can I Get Copies of this Document and Other Related Information?

    1. Docket. EPA has established an official public docket for this 
action under docket ID number OPP-2005-0114. The official public docket 
consists of the documents specifically referenced in this action, any 
public comments received, and other information related to this action. 
Although a part of the official docket, the public docket does not 
include Confidential Business Information (CBI) or other information 
whose disclosure is restricted by statute. The official public docket 
is the collection of materials that is available for public viewing at 
the Public Information and Records Integrity Branch (PIRIB), Rm. 119, 
Crystal Mall 2, 1801S. Bell St., Arlington, VA. This docket 
facility is open from 8:30 a.m. to 4 p.m., Monday through Friday, 
excluding legal holidays. The docket telephone number is (703) 305-
5805.
    2. Electronic access. You may access this Federal Register document 
electronically through the EPA Internet under the ``Federal Register'' 
listings at https://www.epa.gov/fedrgstr/.
    An electronic version of the public docket is available through 
EPA's electronic public docket and comment system, EPA Dockets. You may 
use EPA Dockets at https://www.epa.gov/edocket/ to submit or view public 
comments, access the index listing of the contents of the official 
public docket, and to access those documents in the public docket that 
are available electronically. Although not all docket materials may be 
available electronically, you may still access any of the publicly 
available docket materials through the docket facility identified in 
Unit I.B.1. Once in the system, select ``search,'' then key in the 
appropriate docket ID number.
    Certain types of information will not be placed in the EPA Dockets. 
Information claimed as CBI and other information whose disclosure is 
restricted by statute, which is not included in the official public 
docket, will not be available for public viewing in EPA's electronic 
public docket. EPA's policy is that copyrighted material will not be 
placed in EPA's electronic public docket but will be available only in 
printed, paper form in the official public docket. To the extent 
feasible, publicly available docket materials will be made available in 
EPA's electronic public docket. When a document is selected from the 
index list in EPA Dockets, the system will identify whether the 
document is available for viewing in EPA's electronic public docket. 
Although not all docket materials may be available electronically, you 
may still access any of the publicly available docket materials through 
the docket facility identified in Unit I.B. EPA intends to work towards 
providing electronic access to all of the publicly available docket 
materials through EPA's electronic public docket.
    For public commenters, it is important to note that EPA's policy is 
that public comments, whether submitted electronically or in paper, 
will be made available for public viewing in EPA's electronic public 
docket as EPA receives them and without change, unless the comment 
contains copyrighted material, CBI, or other information whose 
disclosure is restricted by statute. When EPA identifies a comment 
containing copyrighted material, EPA will provide a reference to that 
material in the version of the comment that is placed in EPA's 
electronic public docket. The entire printed comment, including the 
copyrighted material, will be available in the public docket.
    Public comments submitted on computer disks that are mailed or 
delivered to the docket will be transferred to EPA's electronic public 
docket. Public comments that are mailed or delivered to the docket will 
be scanned and placed in EPA's electronic public docket. Where 
practical, physical objects will be photographed, and the photograph 
will be placed in EPA's electronic public docket along with a brief 
description written by the docket staff.

C. How and To Whom Do I Submit Comments?

    You may submit comments electronically, by mail, or through hand 
delivery/courier. To ensure proper receipt by EPA, identify the 
appropriate docket ID number in the subject line on the first page of 
your comment. Please ensure that your comments are submitted within the 
specified comment period. Comments received after the close of the 
comment period will be marked ``late.'' EPA is not required to consider 
these late comments. If you wish to submit CBI or information that is 
otherwise protected by statute, please follow the instructions in Unit 
I.D. Do not use EPA Dockets or e-mail to submit CBI or information 
protected by statute.
    1. Electronically. If you submit an electronic comment as 
prescribed in this unit, EPA recommends that you include your name, 
mailing address, and an e-mail address or other contact information in 
the body of your comment. Also include this contact information on the 
outside of any disk or CD ROM you submit, and in any cover letter 
accompanying the disk or CD ROM. This ensures that you can be 
identified as the submitter of the comment and allows EPA to contact 
you in case EPA cannot read your comment due to technical difficulties 
or needs further information on the substance of your comment. EPA's 
policy is that EPA will not edit your comment, and any identifying or 
contact information provided in the body of a comment will be included 
as part of the comment that is placed in the official public docket, 
and made available in EPA's electronic public docket. If EPA cannot 
read your comment due to technical difficulties and cannot contact you 
for clarification, EPA may not be able to consider your comment.
    i. EPA Dockets. Your use of EPA's electronic public docket to 
submit comments to EPA electronically is EPA's preferred method for 
receiving comments. Go directly to EPA Dockets at https://www.epa.gov/
edocket/, and follow the online instructions for submitting comments. 
Once in the system, select ``search,'' and then key in docket ID number 
OPP-2005-0114. The system is an ``anonymous access'' system, which 
means EPA will not know your identity, e-mail address, or other contact 
information unless you provide it in the body of your comment.
    ii. E-mail. Comments may be sent by e-mail to opp-docket@epa.gov, 
Attention: Docket ID Number OPP-2005-0114. In contrast to EPA's 
electronic public docket, EPA's e-mail system is not an ``anonymous 
access'' system. If you send an e-mail comment directly to the docket 
without going through EPA's electronic public docket, EPA's e-mail 
system automatically captures your e-mail address. E-mail addresses 
that are automatically captured by EPA's e-mail system are included as 
part of the comment that is placed in the official public docket, and 
made available in EPA's electronic public docket.
    iii. Disk or CD ROM. You may submit comments on a disk or CD ROM 
that you mail to the mailing address

[[Page 31457]]

identified in Unit I.C.2. These electronic submissions will be accepted 
in WordPerfect or ASCII file format. Avoid the use of special 
characters and any form of encryption.
    2. By mail. Send your comments to: Public Information and Records 
Integrity Branch (PIRIB) (7502C), Office of Pesticide Programs (OPP), 
Environmental Protection Agency, 1200 Pennsylvania Ave., NW., 
Washington, DC 20460-0001, Attention: Docket ID Number OPP-2005-0114.
    3. By hand delivery or courier. Deliver your comments to: Public 
Information and Records Integrity Branch (PIRIB), Office of Pesticide 
Programs (OPP), Environmental Protection Agency, Rm. 119, Crystal Mall 
2, 1801 S. Bell St., Arlington, VA, Attention: Docket ID 
Number OPP-2005-0114. Such deliveries are only accepted during the 
docket's normal hours of operation as identified in Unit I.B.1.

D. How Should I Submit CBI to the Agency?

    Do not submit information that you consider to be CBI 
electronically through EPA's electronic public docket or by e-mail. You 
may claim information that you submit to EPA as CBI by marking any part 
or all of that information as CBI (if you submit CBI on disk or CD ROM, 
mark the outside of the disk or CD ROM as CBI and then identify 
electronically within the disk or CD ROM the specific information that 
is CBI). Information so marked will not be disclosed except in 
accordance with procedures set forth in 40 CFR part 2.
    In addition to one complete version of the comment that includes 
any information claimed as CBI, a copy of the comment that does not 
contain the information claimed as CBI must be submitted for inclusion 
in the public docket and EPA's electronic public docket. If you submit 
the copy that does not contain CBI on disk or CD ROM, mark the outside 
of the disk or CD ROM clearly that it does not contain CBI. Information 
not marked as CBI will be included in the public docket and EPA's 
electronic public docket without prior notice. If you have any 
questions about CBI or the procedures for claiming CBI, please consult 
the person listed under FOR FURTHER INFORMATION CONTACT.

E. What Should I Consider as I Prepare My Comments for EPA?

    You may find the following suggestions helpful for preparing your 
comments:
    1. Explain your views as clearly as possible.
    2. Describe any assumptions that you used.
    3. Provide copies of any technical information and/or data you used 
that support your views.
    4. If you estimate potential burden or costs, explain how you 
arrived at the estimate that you provide.
    5. Provide specific examples to illustrate your concerns.
    6. Make sure to submit your comments by the deadline in this 
notice.
    7. To ensure proper receipt by EPA, be sure to identify the docket 
ID number assigned to this action in the subject line on the first page 
of your response. You may also provide the name, date, and Federal 
Register citation.

II. What Action is the Agency Taking?

    EPA has received a pesticide petition as follows proposing the 
establishment and/or amendment of regulations for residues of a certain 
pesticide chemical in or on various food commodities under section 408 
of the Federal Food, Drug, and Cosmetic Act (FFDCA), 21 U.S.C. 346a. 
EPA has determined that this petition contains data or information 
regarding the elements set forth in FFDCA section 408(d)(2); however, 
EPA has not fully evaluated the sufficiency of the submitted data at 
this time or whether the data support granting of the petition. 
Additional data may be needed before EPA rules on the petition.

List of Subjects

    Environmental protection, Agricultural commodities, Feed additives, 
Food additives, Pesticides and pests, Reporting and record keeping 
requirements.


    Dated: May 23, 2005.

Lois Rossi,
Director, Registration Division, Office of Pesticide Programs.

Summary of Petition

    The petitioner summary of the pesticide petition is printed below 
as required by FFDCA section 408(d)(3). The summary of the petition was 
prepared by the petitioner and represents the view of the petitioner. 
The petition summary announces the availability of a description of the 
analytical methods available to EPA for the detection and measurement 
of the pesticide chemical residues or an explanation of why no such 
method is needed.


Gowan Company

PP 3F6569

    EPA has received a pesticide petition (PP) 3F6569 from Gowan 
Company, 370 S. Main Street, Yuma, AZ 85365 proposing, pursuant to 
section 408(d) of the FFDCA, 21 U.S.C. 346a(d), to amend 40 CFR part 
180 by establishing a tolerance for residues of hexythiazox: (trans-5- 
(4-chlorophenyl)-N-cyclohexyl-4-methyl-2-oxothiazolidine-3-carboxamide) 
and its metabolites containing the (4-chlorophenyl)-4-methyl-2-
oxothiazolidine moiety expressed as parts per million (ppm) of the 
parent compound in or on grapes at 1.0 ppm, raisins at 4.0 ppm, citrus 
at 0.5 ppm, and citrus oil at 2.0 ppm.
    EPA has determined that the petition contains data or information 
regarding the elements set forth in section 408(d)(2) of the FFDCA; 
however, EPA has not fully evaluated the sufficiency of the submitted 
data at this time or whether the data supports granting of the 
petition. Additional data may be needed before EPA rules on the 
petition.

A. Residue Chemistry

    1. Plant metabolism. The metabolism of hexythiazox as well as the 
nature of the residues in plants is adequately understood for purposes 
of this tolerance. Metabolism studies were conducted in four crops, 
viz.; pears, grapes, oranges and apples. The major residue component is 
unmetabolized parent. The metabolites are hydroxylcyclohexyl and 
ketocyclohexyl analogs of hexythiazox and the amide formed by loss of 
the cyclohexyl ring. Parent hexythiazox and its metabolites are 
converted to a common moiety for residue analysis.
    2. Analytical method. A practical analytical method, high pressure 
liquid chromatography with an Ultraviolet (UV) detector, which detects 
and measures residues of hexythiazox and its metabolites as a common 
moiety, is available for enforcement purposes with a limit of detection 
that allows monitoring of food with residues at or above the levels set 
in this tolerance.
    3. Magnitude of residues. Residue and processing studies on grapes 
and citrus were conducted to support the proposed use. The number of 
trials conducted is sufficient to satisfy requirements for national 
registration for grapes and regional registration (CA, AZ, TX) for 
citrus.

B. Toxicological Profile

    1. Acute toxicity. A battery of acute toxicity studies places 
technical grade hexythiazox in Toxicity Category IV for acute oral 
lethal dose 50 ((LD50) > 5,000 milligram/
kilograms (mg/kg)), Category III for dermal LD50 > 5,000 mg/
kg), Category III for inhalation lethal concentration (LC50) 
(LC50 > 2.0 mg/Liter(L)), Category III for primary eye

[[Page 31458]]

irritation (mild irritation, reddened conjunctiva), Category IV for 
dermal irritation (non irritant). Hexythiazox is a non-sensitizer.
    2. Genotoxicty. The following genotoxicity studies were all 
negative: Ames gene mutation, CHO gene mutation, CHO chromosome 
aberration, mouse micronucleus and rat hepatocyte unscheduled DNA 
synthesis.
    3. Reproductive and developmental toxicity. In a developmental 
toxicity study in rats, the maternal No-Observed-Adverse-Effect-Level 
(NOAEL) was 240 mg/kg/day and the maternal Lowest-Observed-Adverse-
Effect-Level (LOAEL) was 720 mg/kg/day based on increased ovarian 
weights and decreased bone ossification.
    In a developmental toxicity study in rabbits, the maternal NOAEL 
was 1,080 mg/kg/day highest dose tested (HDT); the maternal LOAEL was 
not determined. The developmental NOAEL was 1,080 mg/kg/day (HDT); the 
developmental LOAEL was not determined. In a 2-generation reproduction 
study in rats, the parental NOAEL was 35 mg/kg/day and the parental 
LOAEL was 200 mg/kg/day based on decreased body weight gain, decreased 
food consumption and efficiency, and increased liver, kidney and 
ovarian weights. The reproductive NOAEL was 35 mg/kg/day and the 
reproductive LOAEL was 200 mg/kg/day based on decreased pup body weight 
(bwt) during lactation, delayed hair growth and eye opening.
    4. Subchronic toxicity. In a 1-month feeding study in dogs, the 
NOAEL was 1.75 mg/kg/day and the LOAEL was 12.5 mg/kg/day, based on 
increased liver and adrenal weights.
    5. Chronic toxicity. In a 1-year feeding study in dogs, the NOAEL 
was 2.5 mg/kg/day and the LOAEL was 12.5 mg/kg/day, based on increased 
alkaline phosphatase, increased adrenal and liver weights, and liver 
and adrenal lesions. In a carcinogenicity study in mice, the NOAEL was 
36 mg/kg/day and the LOAEL was 215 mg/kg/day. Effects were decreased 
bwt in males and increased hepatocellular carcinomas and combined 
adenoma/carcinomas.
    In a chronic feeding/carcinogenicity study in rats, the NOAEL 
(systemic) was 26 mg/kg/day and the LOAEL (systemic) was 180 mg/kg/day 
based on decreased bwt gain and increased liver weights in both sexes.
    The chronic reference dose (RfD) for hexythiazox is based on the 1-
year dog feeding study with a NOAEL of 2.5 mg/kg/day and an uncertainty 
factor of 100. The Agency has classified hexythiazox as a category C 
(possible human) carcinogen based on an increased incidence of 
hepatocellular carcinomas (p = 0.028) and combined adenomas/carcinomas 
(p = 0.024) in female mice at the highest dose tested (1,500 ppm) when 
compared to the controls as well as a significantly increased (p 
<0.001) incidence of pre-neoplastic hepatic nodules in both males and 
females at the HDT. The decision supporting a category C classification 
was based primarily on the fact that only one species was affected and 
mutagenicity studies were negative. In classifying hexythiazox as a 
category C carcinogen, the Agency concluded that a quantitative 
estimate of the carcinogenic potential for humans should be calculated 
because of the increased incidence of liver tumors in the female mouse. 
A Q1* of 0.022 mg/kg/day-\1\ in human equivalents was 
published in the Federal Register of October 16, 1998 (63 FR 55540) 
(FRL-6035-2).
    6. Animal metabolism. The metabolism of hexythiazox has been 
studied in goats, hens and rats. Metabolic pathways in the animal are 
similar to those in plants.
    7. Metabolite toxicology. There are no metabolites of toxicological 
concern based on a differential metabolism between plants and animals.
    8. Endocrine disruption. No specific tests have been conducted with 
hexythiazox to determine whether the chemical may have an effect in 
humans that is similar to an effect produced by a naturally occurring 
estrogen or other endocrine effects. However, there were no significant 
findings in other relevant toxicity tests, i.e., teratology and multi-
generation reproduction studies, which would suggest that hexythiazox 
produces effects characteristic of the disruption of the estrogenic 
hormone.

C. Aggregate Exposure

    1. Dietary exposure from food. Tolerances have been established (40 
CFR 180.479) for residues of hexythiazox (trans-5- (4-chlorophenyl)-N-
cyclohexyl-4-methyl-2-oxothiazolidine-3-carboxamide) and its 
metabolites containing the (4-chlorophenyl)-4-methyl-2-oxo-3-
thiazolidine moiety in or on apples at 0.50 ppm; wet apple pomace at 
0.80 ppm; pears at 0.30 ppm; stone fruits (except plums) at 1.0 ppm; 
plum, prune, fresh at 0.1 ppm; plum, prune, dried at 0.4 ppm; 
strawberries at 3.0 ppm; nut tree group at 0.30 ppm; pistachio at 0.30 
ppm; almond hulls at 10 ppm; caneberry crop group at 2.0 ppm; dates at 
1.0 ppm; hops at 2.0 ppm; milk at 0.02 ppm; fat of cattle, goats, 
horses, swine and sheep at 0.02 ppm; meat byproducts of cattle, goats, 
horses, swine and sheep at 0.02 ppm; cotton, undelinted seed (CA only), 
at 0.20 ppm; and cotton gin byproducts (CA only) at 3.0 ppm, and a 
tolerance of 0.1 ppm for greenhouse tomatoes is pending. Additional 
tolerances are being requested in this petition for grapes at 1.0 ppm, 
raisins at 4 ppm, citrus (CA, AZ, TX) at 0.5 ppm, and citrus oil at 2.0 
ppm.
    EPA has estimated the following dietary exposures from hexythiazox 
in food (Federal Register of September 29, 2000 (65 FR 58437) (FRL-
6746-5).
    i. Acute exposure. For acute dietary exposure of the general 
population including infants and children, a dose and endpoint 
attributable to a single exposure were not identified by the Agency 
from the available oral toxicity studies, including maternal toxicity 
in the developmental toxicity studies. An acute RfD of 2.4 mg/kg/day 
for females 13-50 years of age was identified from the rat 
developmental toxicology study based on delayed ossification. A 
conservative analysis was performed by the Agency using existing and 
recommended tolerance level residues and 100% crop treated (CT) 
information for all commodities. The acute dietary exposure estimate 
for the females 13-50 years old subgroup was 0.002617 mg/kg/day at the 
95th percentile. The registrant has concluded that hexythiazox use on 
grapes and citrus will not significantly contribute to this dietary 
exposure.
    ii. Chronic exposure. A partially refined deterministic analysis 
was performed by the Agency using anticipated residues (AR) levels for 
most crops and %CT or anticipated market share information for all 
crops. Dietary exposure estimates for the U.S. population and other 
representative subgroups were <0.00003 mg/kg/day. The registrant has 
concluded that hexythiazox use on grapes and citrus will not 
significantly contribute to this dietary exposure.
    iii. Cancer. A partially refined deterministic carcinogenic risk 
estimate analysis was performed by the Agency using AR levels and %CT 
or anticipated market share information for all crops. The chronic 
dietary exposure estimate for the U.S. population was 0.000011 mg/kg/
day. The registrant has concluded that hexythiazox use on grapes and 
citrus will not significantly contribute to this dietary exposure.
    2. Dietary exposure from drinking water. Using the Generic expected 
environmental concentration (GENEEC) and Screening concentration in 
ground water (SCI-GROW) models, the Agency has calculated the estimated 
environmental concentrations (EECs) of hexythiazox to be 910.32 
nanogram

[[Page 31459]]

(ng)/L for surface water and 1.47 ng/L for ground water. These 
estimates are based on a maximum application rate of 0.1875 lbs. active 
ingredient per acre.
    3. From non-dietary exposure. The term ``residential exposure'' is 
used by the Agency to refer to non-occupational, non-dietary exposure 
(e.g., for lawn and garden pest control, indoor pest control, 
termiticides, and flea and tick control on pets). Hexythiazox is not 
registered for use on any sites that would result in residential 
exposure.

D. Cumulative Exposure

    EPA has not determined whether hexythiazox has a common mechanism 
of toxicity with other substances or how to include this pesticide in a 
cumulative risk assessment. Unlike other pesticides for which EPA has 
followed a cumulative risk approach based on a common mechanism of 
toxicity, hexythiazox does not share a toxic metabolite with other 
substances. For the purposes of this tolerance action, therefore, the 
registrant has not assumed that hexythiazox has a common mechanism of 
toxicity with other substances. For purposes of this petition the 
potential risks of hexythiazox in its aggregate exposure will only be 
considered.

E. Safety Determination

    1. U.S. population--i. Acute risk. Aggregate exposure risk includes 
exposure from food and water. For acute dietary exposure of the general 
population, a dose and endpoint attributable to a single exposure were 
not identified by the Agency from the available oral toxicity studies. 
For the relevant population subgroup of females 13+ years, the risk 
from acute ``food only'' exposure is less than 1% of the RfD, which is 
less than EPA's level of concern. The acute drinking water level of 
comparison (DWLOC) calculated for the relevant population subgroup of 
females 13+ years is 72,000 parts per billion (ppb). The calculated 
DWLOC is significantly higher than the drinking water EECs for ground 
water (0.0015 ppb) and surface water (0.910 ppb). EPA has concluded 
with reasonable certainty that residues of hexythiazox in drinking 
water do not contribute to the acute aggregate health risk.
    ii. Short- and intermediate-term risk. Hexythiazox is not 
registered for use on any sites that would result in residential 
exposure. Therefore, the aggregate risk is the sum of the risk from 
food and water, which do not exceed the Agency's level of concern.
    iii. Chronic risk. Aggregate chronic risk (non cancer) exposure 
from ``food only'' exposure utilizes less than 1% of the RfD for all 
population subgroups. The chronic DWLOC for hexythiazox exposure in 
drinking water is 870 ppb for the U.S. population and 250 ppb for 
infants and children. The calculated DWLOCs are significantly higher 
than the drinking water EECs for ground water (0.0015 ppb) and surface 
water (0.910 ppb). EPA has concluded with reasonable certainty that 
residues of hexythiazox in drinking water do not contribute to the 
chronic (non cancer) aggregate health risk.
    iv. Cancer risk. The carcinogenic risk estimate (food only) for the 
general U.S. population <5 x 10-\7\. Thus, the carcinogenic 
dietary risk associated with the existing and proposed uses of 
hexythiazox does not exceed the level of concern for excess lifetime 
cancer risk (1 x 10-\6\). The surface water and ground water 
EECs were used to compare against back calculated the DWLOC for 
aggregate risk assessments. For the carcinogenic risk scenario, EPA 
calculated a DWLOC of 1.2 ppb for the U.S. population. The EECs ground 
water and surface water (0.0015 ppb and 0.910 ppb, respectively) are 
less than EPA's calculated DWLOC. Therefore, EPA concluded that 
residues of hexythiazox in drinking water do not contribute 
significantly to the carcinogenic aggregate human health risk.
    2. Infants and children. For acute dietary exposure of infants and 
children, a dose and endpoint attributable to a single exposure were 
not identified by the Agency from the available oral toxicity studies. 
The Agency has determined that the 10X-safety factor to protect infants 
and children should be removed and reduced to 1X. It is concluded that 
there is a reasonable certainty of no harm to infants and children from 
aggregate exposure to hexythiazox residues.

F. International Tolerances

    National maximum residue levels (MRL) for hexythiazox on grapes 
have been established at 0.5 ppm in Germany, France, Italy, Spain, 
Austria, and Hungry, and at 0.05 ppm in Switzerland. MRLs for 
hexythiazox on citrus have been established at 2.0 ppm in Japan and 
Korea, at 1.0 ppm in Spain, at 0.5 ppm in Italy, at 1.0 ppm for peel 
and 0.01 ppm for pulp in Brazil, 0.2 ppm in France and 0.1 ppm in New 
Zealand.

[FR Doc. 05-10843 Filed 5-31-05; 8:45 am]
BILLING CODE 6560-50-S