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triflusulfuron methyl (Pinnacle) Pesticide Petition Filing 7/01


ENVIRONMENTAL PROTECTION AGENCY

[PF-1036; FRL-6795-4]


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 proposing the establishment of regulations for residues of a
certain pesticide chemical in or on various food commodities.

DATES: Comments, identified by docket control number PF-1036, must be
received on or before September 7, 2001.

ADDRESSES: Comments may be submitted by mail, electronically, or in
person. Please follow the detailed instructions for each method as
provided in Unit I.C. of the SUPPLEMENTARY INFORMATION. To ensure
proper receipt by EPA, it is imperative that you identify docket
control number PF-1036 in the subject line on the first page of your
response.

FOR FURTHER INFORMATION CONTACT: By mail: Shaja R. Brothers,
Registration Division (7505C), Office of Pesticide Programs,
Environmental Protection Agency, 1200 Pennsylvania Ave., NW.,
Washington, DC 20460; telephone number: (703) 803-3194; e-mail address:
brothers.shaja@epa.gov.

SUPPLEMENTARY INFORMATION:

I. General Information

A. Does this Action Apply to Me?

    You may be affected by this action if you are an agricultural
producer, food manufacturer or pesticide manufacturer. Potentially
affected categories and entities may include, but are not limited to:

------------------------------------------------------------------------
                                                          Examples of
           Categories                 NAICS codes         potentially
                                                       affected entities
------------------------------------------------------------------------
Industry                          111                 Crop production
                                  112                 Animal production
                                  311                 Food manufacturing
                                  32532               Pesticide
                                                       manufacturing
------------------------------------------------------------------------

    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 the table could also be
affected. The North American Industrial Classification System (NAICS)
codes have been provided to assist you and others in determining
whether or not this action might apply to certain entities. If you have
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 Additional Information, Including Copies of this
Document and Other Related Documents?

    1. Electronically. You may obtain electronic copies of this
document, and certain other related documents that might be available
electronically, from the EPA Internet Home Page at http://www.epa.gov/.
To access this document, on the Home Page select ``Laws and
Regulations'' ``Regulation and Proposed Rules,'' and then look up the
entry for this document under the ``Federal Register--Environmental
Documents.'' You can also go directly to the Federal Register listings
at http://www.epa.gov/fedrgstr/.
    2. In person. The Agency has established an official record for
this action under docket control number PF-1036. The official record
consists of the documents specifically referenced in this action, any
public comments received during an applicable comment period, and other
information related to this action, including any information claimed
as confidential business information (CBI). This official record
includes the documents that are physically located in the docket, as
well as the documents that are referenced in those documents. The
public version of the official record does not include any information
claimed as CBI. The public version of the official record, which
includes printed, paper versions of any electronic comments submitted
during an applicable comment period, is available for inspection in the
Public Information and Records Integrity Branch (PIRIB), Rm. 119,
Crystal Mall #2, 1921 Jefferson Davis Highway, Arlington, VA, from 8:30
a.m. to 4 p.m., Monday through Friday, excluding legal holidays. The
PIRIB telephone number is (703) 305-5805.

C. How and to Whom Do I Submit Comments?

    You may submit comments through the mail, in person, or
electronically. To ensure proper receipt by EPA, it is imperative that
you identify docket control number PF-1036 in the subject line on the
first page of your response.
    1. By mail. Submit your comments to: Public Information and Records
Integrity Branch (PIRIB), Information Resources and Services Division
(7502C), Office of Pesticide Programs (OPP), Environmental Protection
Agency, 1200 Pennsylvania Ave., NW., Washington, DC 20460.
    2. In person or by courier. Deliver your comments to: Public
Information and Records Integrity Branch (PIRIB), Information Resources
and Services Division (7502C), Office of Pesticide Programs (OPP),
Environmental Protection Agency, Rm. 119, Crystal Mall #2, 1921
Jefferson Davis Highway, Arlington, VA. The PIRIB is open from 8:30
a.m. to 4 p.m., Monday through Friday, excluding legal holidays. The
PIRIB telephone number is (703) 305-5805.
    3. Electronically. You may submit your comments electronically by
e-mail to: opp-docket@epa.gov, or you can submit a computer disk as
described above. Do not submit any information electronically that you
consider to be CBI. Avoid the use of special characters and any form of
encryption. Electronic submissions will be accepted in Wordperfect 6.1/
8.0 or ASCII file format. All comments in electronic form must be
identified by docket control number PF-1036. Electronic comments may
also be filed online at many Federal Depository Libraries.

D. How Should I Handle CBI That I Want to Submit to the Agency?

    Do not submit any information electronically that you consider to
be CBI. You may claim information that you submit to EPA in response to
this document as CBI by marking any part or all of that information as
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 version of the
official record.

Information not marked confidential will be included in the public
version of the official record without prior notice. If you have any
questions about CBI or the procedures for claiming CBI, please consult
the person identified 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
control 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 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 recordkeeping
requirements.


    Dated: July 27, 2001.
Peter Caulkins,
Acting Director, Registration Division, Office of Pesticide Programs.

Summary of Petition

    The petitioner summary of the pesticide petition is printed below
as required by section 408(d)(3) of the FFDCA. The summary of the
petition was prepared by the petitioner and represents the view of the
petitioner. EPA is publishing the petition summary verbatim without
editing it in any way. 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.

Interregional Research Project #4 (IR-4)

PP (0E6214)

    EPA has received a pesticide petition [0E6214]
from the
Interregional Research Project #4 (IR-4), 681 US Highway #1 South,
North Brunswick, NJ 08902 proposing, pursuant to section 408(d) of the
FFDCA, 21 U.S.C. 346a(d), to amend 40 CFR part 180.492 by establishing
a tolerance for residues of triflusulfuron methyl in or on the raw
agricultural commodity chicory (root) at 0.05 parts per million (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 support granting of the petition.
Additional data may be needed before EPA rules on the petition. This
notice includes a summary of the petition prepared by Dupont, E.I. du
Pont Nemours and Company, Agricultural Products, Wilmington, DE 19898.

A. Residue Chemistry

    1. Plant metabolism. The metabolism and chemical nature of residues
of triflusulfuron-methyl in plants is adequately understood.
    2. Analytical method. High performance liquid chromatograph (HPLC)
is the analytical method acceptable for determining residues of
triflusulfuron-methyl in plants, and is available for enforcement
purposes.
    3. Magnitude of residues. The magnitude of residue data for
triflusulfuron methyl in/on chicory is adequately understood. Residue
field trials conducted in Washington and California have shown that the
maximum residues in the raw agricultural commodity chicory and the
processed commodities dry pulp and inulin were below the limit of
detection (0.016 ppm). A tolerance for residues of triflusulfuron-
methyl in chicory root at 0.05 ppm is consistent with the tolerances
proposed by Du Pont for sugar beet roots and tops at 0.05 ppm.

B. Toxicological Profile

    1. Acute toxicity. Based on EPA criteria, technical triflusulfuron
methyl is in acute toxicity Category IV for oral and inhalation routes
of exposure, and for dermal irritation. Triflusulfuron methyl is in
acute toxicity Category III for dermal toxicity and for eye irritation.
Acute oral toxicity in rats LD50 5,000 mg/kg; acute dermal
toxicity in rabbits LD50 2,000 mg/kg; and acute inhalation
toxicity in rats LC50 5.1 mg/L. Primary eye irritation in
rabbits, non-irritant primary dermal irritation in rabbits, non-
irritant dermal sensitization in guinea pigs, and non-sensitizer acute
neurotoxicity no observed adverse effect level (NOAEL)= 2,000 mg/kg/day
highest dose tested (HDT).
    2. Genotoxicity. Mutagenicity data for technical triflusulfuron
methyl include a reverse mutation assay (Ames Test) which was negative
at concentrations up to 1,000 mg/plate, the HDT; a Salmonella
typhimurium plate incorporation assay which was negative at
concentrations up to 3,000 mg/plate, HDT; and a Chinese
hamster ovary/hypoxanthine-guanine (CHO/HPRT) assay which was negative
at concentrations up to 2,000 mg/kg/day, HDT. A chromosomal aberration/
human lymphocyte assay was positive in the presence of metabolic
activation at concentrations greater than or equal to 1,500
mg/mL. A second chromosomal aberration/human lymphocyte assay was
positive in the presence of metabolic activation at concentrations of
2,000 mg/mL. Results in the absence of metabolic activation
were inconclusive for both chromosomal aberration studies. The mouse
bone marrow micronucleus test was negative at doses up to 5,000 mg/kg,
HDT. In three Salmonella typhimurium plate incorporation assays,
metabolites of triflusulfuron methyl were negative up to 5,000
mg/plate, HDT.
    3. Reproductive and developmental toxicity. In a 2-generation rat
reproduction study, rats were fed dosages of 0, 0.588, 5.81, 44.0 and
89.5 mg/kg/day (males) and 0, 0.764, 7.75, 58.0, and 115 mg/kg/days
(females) with a reproductive toxicity NOAEL equal to or greater than
89.5 and 115 mg/kg/day for males and females, respectively, based on
the absence of reproductive
effects in rats at the HDT. The NOAEL for systemic toxicity was 5.81
and 7.75 mg/kg/day for males and females, respectively based on
decreased body weight/body weight gain (bwt/bwt gain) and food
efficiency in males and females, and decreased weights of offspring
from the F0 generation on days 14 and 21 post-partum at 44.0
and 58.0 mg/kg/day in males and females, respectively. Technical
triflusulfuron methyl was evaluated for developmental toxicity
potential in rats and rabbits. Rats were fed dosages of 0, 30, 120,
350, and 1,000 mg/kg/day with a developmental NOAEL equal to or greater
than 1,000 mg/kg/day (HDT) and a maternal toxicity NOAEL of 120 mg/kg/
day with a lowest observed adverse effect level (LOAEL) of 350 mg/kg/
day based on reduced body weight gain in the 350 and 1,000 mg/kg/day
animals, reduced food consumption in the 1,000 mg/kg/day animals and
lower food efficiency in the 350 and 1,000 mg/kg/day. Rabbits were fed
dosages of 0, 15, 90, 270, and 800 mg/kg/day with a NOAEL for
developmental toxicity of 90 mg/kg/day with a LOAEL of 270 mg/kg/day
based on the increase in abortions and a decrease in mean fetal body
weight (bwt). The NOAEL for maternal toxicity is 90 mg/kg/day with a
LOAEL of 270 mg/kg/day based on the maternal death and abortions, and
increase in clinical signs noted in the mid-high and high dose groups,
decreased food efficiency and increased post mortem finding describing
gastrointestinal effects.
    4. Subchronic toxicity. The subchronic toxicity of technical
triflusulfuron methyl was evaluated in rabbits, rats, and dogs. In a
21-day dermal toxicity study with rabbits fed dosages of 50, 300, or
1,000 mg/kg/day, the systemic toxicity NOAEL was equal to or greater
than 1,000 mg/kg/day for males and females. The dermal toxicity NOAEL
was equal to or greater than 1,000 mg/kg/day for males and females.
    Two 90-day studies were conducted in the rat. In one study, rats
were fed dosages of 6.2, 127, 646, or 965 mg/kg/day (males) or 7.54,
150, 774, or 1,070 mg/kg/day (females). Triflusulfuron methyl exhibited
subchronic toxicity at dietary concentrations of 2,000 ppm (127 and 150
mg/kg/day for males and females) or greater in the form of decreased
body weights, decreased body weight gains, decreased food efficiency,
increased mean relative liver weights, and regenerative anemia. The
NOAEL was 6.2 mg/kg/day (males) and 7.54 mg/kg/day (females).
    In another study, rats were fed dosages of 6.56, 133, 658, or 1,036
mg/kg/day (males) or 7.71, 153, 783, or 1,124 mg/kg/day (females).
Triflusulfuron methyl showed subchronic toxicity at dietary
concentrations of 2,000 ppm (133 and 153 mg/kg/day for males and
females) or greater in the form of decreased body weight, decreased
body weight gain, decreased food efficiency, and increased mean liver
weights. The NOAEL was 6.56 mg/kg/day (males) and 7.71 mg/kg/day
(females).
    A subchronic neurotoxicity study with rats fed dosages of 0, 6.1,
46.1, 92.7, or 186.2 mg/kg/day (males) or 7.1, 51.6, 104.1, or 205.2
mg/kg/day (females), resulted in a NOAEL of 92.7 (males) and 7.1 mg/kg/
day (females). This was based on decreased body weight/body weight gain
at the LOAEL of 186.2 mg/kg/day (males) and 51.6 mg/kg/day (females).
    In another 90-day subchronic study, dogs were fed dosages of 3.87,
146.1, or 267.6 mg/kg/day (males) or 3.72, 159.9, or 250.7 mg/kg/day
(females). Triflusulfuron methyl was found to be hepatotoxic at 4,000
ppm (146.1 mg/kg/day males and 159.9 mg/kg/day females), and greater
elevated hepatic enzyme levels and postmortem evidence, including
elevation in liver weights and microscopic evidence of bile stasis.
Other microscopic findings considered to be treatment related were
testicular atrophy and decreased testicular weights and
hypercellularity of the sternal and femoral bone marrow, with a
corresponding increase in reticulocyte and leukocyte counts seen in the
high-dose males and females. Based on the microscopic findings in the
liver and testes of the 4,000 ppm and greater treated animals, the
NOAEL was 3.87 mg/kg/day (males) and 3.72 mg/kg/day (females).
    5. Chronic toxicity. The chronic toxicity of technical
triflusulfuron methyl was evaluated in dogs, mice, and rats. In a 1-
year oral toxicity study with dogs fed dosages of 1.0, 26.9, 111.6 mg/
kg/day (males) and 1.2, 27.7, and 95.5 mg/kg/day (females), the NOAEL
for males was 26.9 mg/kg/day; this was based on increases in alkaline
phosphatase, liver weight, and incidence of minimal centrilobular
hypertrophy at the LOAEL of 111.6. For females, the NOAEL was 27.7 mg/
kg/day; this was based on increased liver weight and increased
incidence of minimal centrilobular hepatocellular hypertrophy at the
LOAEL of 95.5 mg/kg/day.
    In an 18-month carcinogenicity study, mice were fed dosages of
1.37, 20.9, 349, and 1,024 mg/kg/day (males) and 1.86, 27.7, 488, and
1,360 mg/kg/day (females). Male mice had statistically significant
positive trends for hepatocellular adenomas and for combined adenoma/
carcinoma (driven entirely by adenomas) at 349 and 1,024 mg/kg/day.
These increases were not significant in pair-wise comparisons with
control groups and were determined not to be carcinogenic effects by
the Carcinogenicity Peer Review Committee (CPRC). The NOAEL was based
on body and organ weight effects and was 20.9 mg/kg/day (males) and
27.7 mg/kg/day (females). In the combined chronic toxicity/
carcinogenicity study, rats were fed dosages of 0, 0.406, 4.06, 30.6,
and 64.5 mg/kg/day (males) and 0, 0.546, 5.47, 41.5, and 87.7 mg/kg/day
(females). Male rats have a significant increasing trend and
significant differences in pair-wise comparisons of the 30.6 and 64.5
mg/kg/day dose groups with controls for interstitial cell adenomas.
This effect was determined to be a carcinogenic effect by the CPRC. No
carcinogenic effects were noted in females up to and including 87.7 mg/
kg/day HDT. The LOAEL for chronic toxicity is 30.6 mg/kg/day (males)
and 41.5 (females) based on decreased body weight and body weight gain,
alternations in the hematology parameters (males predominately) and an
increased incidence of interstitial cell hyperplasia in males. The
NOAEL for chronic toxicity is 4.06 mg/kg/day (males) and 5.47 mg/kg/day
(females). This value is adjusted to the lowest concentration level of
the chemical at this dosage (60%), resulting in NOAELs of 2.44 mg/kg/
day (males) and 3.28 mg/kg/day (females).
    6. Animal metabolism. For triflusulfuron methyl, in both the rat
and the goat, a majority of the administrated dose was excreted in
feces and urine. The biotransformation pathway for triflusulfuron
methyl in the rat and the goat was similar. The major pathway was
demethylation of the dimethylamino substituent on the triazine ring.
The intermediate hydroxylated metabolite was also present. The
secondary biotransformation pathway was clevage of the sulfonylurea
bridge to form methyl saccharin, N-desmethyl triazine amine and N,N-
bis-desmethyl triazine amine. In the lactating goat, triflusulfuron
methyl was not excreted to any appreciable level in the milk. Levels of
the ester carbonyl-derived residues were generally below the limit of
reliable measurement ( 0.0006 mg equivalent triflusulfuron
methyl/mL) and triazine-derived residues reached a daily level of about
0.001 ppm. Therefore, the metabolic pathways in rats and lactating
goats were very
similar. There were no significant plant metabolites of triflusulfuron
methyl that were not found in the rat or goat metabolism studies. In
the unlikely event that triflusulfuron methyl were to enter the
livestock diet, triflusulfuron methyl and its metabolites would be
rapidly excreted and would not accumulate in meat, meat by-products, or
milk.
    7. Metabolite toxicology. The approximate lethal dose (ALD) of the
degradation product, N,N-bis-desmethyl triazine amine, in male rats was
450 mg/kg/day. Rats were fed dose rates of 200, 300, 450, 670, 1,000,
and 2,300 mg/kg of triflusulfuron methyl. Deaths occurred up to test
day 7 in rats dosed at 450 mg/kg body weight and above. Clinical signs
of toxicity were observed in lethally and nonlethally dosed rats. In an
in vitro gene mutation study, N,N,-bis-desmethyl triazine amine was not
mutagenic in Salmonella typhimurium up to a dose of 5,000 mg/
plate. For the degradation product, triazine amine, the ALD in male
rats was 670 mg/kg/day. The test substance dose was 200, 300, 450, 670,
1,000, or 2,300 mg/kg. Deaths occurred up to test day 4 in rats dosed
at 670 mg/kg and above. Clinical signs of toxicity were observed in
lethally and nonlethally dosed animals. In an in vitro gene mutation
study, triazine amine was not mutagenic in Salmonella typhimurium up to
a dose of 5,000 mg/plate.
    8. Endocrine disruption. No special studies investigating potential
estrogenic or other endocrine effects of methyl have been conducted.
However, the standard battery of required toxicology studies have been
completed. These include an evaluation of the potential effects on
reproduction and development, and an evaluation of the pathology of the
endocrine organs following repeated or long-term exposure to doses that
far exceed likely human exposures. Based on these studies there is no
evidence to suggest that triflusulfuron methyl has an adverse effect on
the endocrine system.

C. Aggregate Exposure

    1. Dietary exposure--i. Food. The acute dietary exposure was
estimated for triflusulfuron methyl using the Dietary Exposure
Evaluation Model (DEEM) (version 6.73) for a number of subpopulation
groups. An acute Tier I dietary analysis was based upon the residues
for sugar beet (root) at 0.05 ppm and sugar beet (top) at 0.05 ppm. The
acute reference dose (aRfD) is 0.9 mg/kg bwt/day (based upon a NOAEL of
90 mg/kg bwt/day and a 100-fold safety factor). For triflusulfuron
methyl, the predicated exposure for the U.S. population was 0.00460 mg/
kg bwt/day (0.05 % of the aRfD) at the 95th percentile. The
subpopulation with the highest predicted exposure was the non-nursing
infants subgroup with an exposure of 0.00166 mg/kg bwt/day (0.19% of
the aRfD) at the 95th percentile. Because the predicted exposures,
expressed as percentages of the aRfD, are well below 100%, there is
reasonable certainty that no acute effects would result from dietary
exposure to triflusulfuron methyl.
    The chronic dietary exposure was estimated for triflusulfuron
methyl using the DEEM (version 6.74) for a number of subpopulation
groups. A chronic Tier I dietary analysis was based upon residues for
sugar beet (root) at 0.05 ppm and sugar beet (top) at 0.05 ppm. The
chronic Reference dose (RfD) is 0.024 mg/kg bwt/day (based upon a NOAEL
of 2.44 mg/kg bwt/day and a safety factor of 100). The estimated
exposure for the U.S. population was 0.000146 mg/kg bwt/day (0.6% of
the RfD). For the subpopulation with the highest level of exposure
(non-nursing infants), the exposure was 0.000433 mg/kg bwt/day (1.8% of
the chronic reference dose (cRfD)). Because the predicted exposures,
expressed as percentages of the cRfD, are well below 100%, there is
reasonable certainty that no chronic effects would result from dietary
exposure to triflusulfuron methyl. Even though very conservative
assumptions were made in predicting acute and chronic exposures to
triflusulfuron methyl, the predicted exposures expressed as percentages
of the cRfD and aRfD values were found to be well within the acceptable
range.
    ii. Drinking water. Based on the available environmental studies
conducted with triflusulfruon methyl, DuPont concludes that there is no
anticipated exposure to residues of triflusulfuron methyl in drinking
water. In addition, there is no established maximum concentration level
(MCL) for residues of triflusulfuron methyl in drinking water.
    2. Non-dietary exposure. Triflusulfuron methyl is not registered
for any use that could result in non-occupational or non-dietary
exposure to the general population.

D. Cumulative Effects

    Triflusulfuron methyl belongs to the sulfonylurea class of crop
protection chemicals. Other structurally similar compounds in this
class are registered herbicides. However, the herbicidal activity of
sulfonylureas is due to the inhibition of acetolacate synthase (ALS),
an enzyme found only in plants. This enzyme is part of the biosynthesis
pathway leading to the formation of branched chain amino acids. Animals
lack ALS and this biosynthetic pathway. This lack of ALS contributes to
the relatively low toxicity of sulfonylurea herbicides in animals.
There is no reliable information that would indicate or suggest that
triflusulfuron methyl has any toxic effects on mammals that would be
cumulative with those of any other chemical.

E. Safety Determination

    1. U.S. population. Based on the completeness and reliability of
the toxicology data base and using the conservative assumptions
presented earlier, EPA has established a cRfD of 0.024 mg/kg/day. This
was based on the NOAEL for the 2-year chronic rat study (2.44 mg/kg/
day) and a 100-fold safety factor. It has been concluded that the
aggregate exposure was 0.6% of the cRfD. Generally, exposures below
100% of the cRfD are of no concern because it represents the level at
or below which daily aggregate exposure over a lifetime will not pose
appreciable risk to human health. Thus, there is reasonable certainty
that no harm will result from aggregate exposures to triflusulfuron
methyl residues.
    2. Infants and children. In assessing the potential for additional
sensitivity of infants and children to residues of triflusulfuron
methyl, data from the previously discussed developmental and multi-
generation reproductive toxicity studies were considered. Developmental
studies are designed to evaluate adverse effects on the developing
organism resulting from pesticide exposure during prenatal development.
Reproduction studies provide information relating to reproductive and
other effects on adults and offspring from the prenatal and postnatal
exposures to the pesticide. The studies with triflusulfuron methyl
demonstrated no evidence of developmental toxicity at exposures below
those causing maternal toxicity. This indicates that developing animals
are not more sensitive to the effects of triflusulfuron methyl
administration than adults.
    FFDCA section 408 provides that EPA may apply an additional
uncertainty factor for infants and children in the case of threshold
effects to account for prenatal and postnatal toxicity and the
completeness of the data base. Based on current toxicological data
requirements, the data base for triflusulfuron methyl relative to
prenatal and postnatal effects for children is complete. In addition,
the NOAEL of 2.44 mg/kg/day in the chronic rat study (and upon which
the cRfD is based) is much lower than the
NOAELs defined in the reproduction and developmental toxicology
studies. The sub-population with the highest level of exposure was non-
nursing infants, where exposure was  1.8% of the cRfD. Based on these
conservative analyses, there is reasonable certainty that no harm will
result to infants and children from aggregate exposures to
triflusulfuron methyl.

F. International Tolerances

    There are no Codex Maximum Residue Levels established for
triflusulfuron methyl.
[FR Doc. 01-19756 Filed 8-7-01; 8:45 am]