Document ID: EPA-HQ-OPP-2017-0063-0009
Agency: epa
Document Type: Rule
Title: Pesticide Tolerance Exemptions: Chlorate
Posted Date: 2018-12-26T05:00Z

[Federal Register Volume 83, Number 246 (Wednesday, December 26, 2018)]
[Rules and Regulations]
[Pages 66138-66143]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2018-27908]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 180

[EPA-HQ-OPP-2017-0063; FRL-9986-85]

Chlorate; Pesticide Exemptions From Tolerance

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

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SUMMARY: This regulation establishes an exemption from the requirement 
of a tolerance for residues of chlorate in or on cantaloupe and tomato 
under the Federal Food, Drug, and Cosmetic Act (FFDCA).

DATES: This regulation is effective December 26, 2018. Objections and 
requests for hearings must be received on or before February 25, 2019 
and must be filed in accordance with the instructions provided in 40 
CFR part 178 (see also Unit I.C. of the SUPPLEMENTARY INFORMATION).

ADDRESSES: The docket for this action, identified by docket 
identification (ID) number EPA-HQ-OPP-2017-0063, is available at http://www.regulations.gov or at the Office of Pesticide Programs Regulatory 
Public Docket (OPP Docket) in the Environmental Protection Agency 
Docket Center (EPA/DC), West William Jefferson Clinton Bldg., Rm. 3334, 
1301 Constitution Ave. NW, Washington, DC 20460-0001. The Public 
Reading Room is open from 8:30 a.m. to 4:30 p.m., Monday through 
Friday, excluding legal holidays. The telephone number for the Public 
Reading Room is (202) 566-1744, and the telephone number for the OPP 
Docket is (703) 305-5805. Please review the visitor instructions and 
additional information about the docket available at http://www.epa.gov/dockets.

FOR FURTHER INFORMATION CONTACT: Anita Pease, Antimicrobials Division 
(7510P), Office of Pesticide Programs, Environmental Protection Agency, 
1200 Pennsylvania Ave. NW, Washington, DC 20460-0001; main telephone 
number: (703) 305-7090; email address: ADFRNotices@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. 
The following list of North American Industrial Classification System 
(NAICS) codes is not intended to be exhaustive, but rather provides a 
guide to help readers determine whether this document applies to them. 
Potentially affected entities may include:
     Crop production (NAICS code 111).
     Animal production (NAICS code 112).
     Food manufacturing (NAICS code 311).
     Pesticide manufacturing (NAICS code 32532).

B. How can I get electronic access to other related information?

    You may access a frequently updated electronic version of EPA's 
tolerance regulations at 40 CFR part 180 through the Government 
Printing Office's e-CFR site at http://www.ecfr.gov/cgi-bin/text-idx?&c=ecfr&tpl=/ecfrbrowse/Title40/40tab_02.tpl.

C. How can I file an objection or hearing request?

    Under FFDCA section 408(g), 21 U.S.C. 346a, any person may file an 
objection to any aspect of this regulation and may also request a 
hearing on those objections. You must file your objection or request a 
hearing on this regulation in accordance with the instructions provided 
in 40 CFR part 178. To ensure proper receipt by EPA, you must identify 
docket ID number EPA-HQ-OPP-2017-0063 in the subject line on the first 
page of your submission. All objections and requests for a hearing must 
be in writing and must be received by the Hearing Clerk on or before 
February 25, 2019. Addresses for mail and hand delivery of objections 
and hearing requests are provided in 40 CFR 178.25(b).
    In addition to filing an objection or hearing request with the 
Hearing Clerk as described in 40 CFR part 178, please submit a copy of 
the filing (excluding any Confidential Business Information (CBI)) for 
inclusion in the public docket. Information not marked confidential 
pursuant to 40 CFR part 2 may be disclosed publicly by EPA without 
prior notice. Submit the non-CBI copy of your objection or hearing 
request, identified by docket ID number EPA-HQ-OPP-2017-0063, by one of 
the following methods:
     Federal eRulemaking Portal: http://www.regulations.gov. 
Follow the online

[[Page 66139]]

instructions for submitting comments. Do not submit electronically any 
information you consider to be CBI or other information whose 
disclosure is restricted by statute.
     Mail: OPP Docket, Environmental Protection Agency Docket 
Center (EPA/DC), (28221T), 1200 Pennsylvania Ave. NW, Washington, DC 
20460-0001.
     Hand Delivery: To make special arrangements for hand 
delivery or delivery of boxed information, please follow the 
instructions at http://www.epa.gov/dockets/contacts.html.
    Additional instructions on commenting or visiting the docket, along 
with more information about dockets generally, is available at http://www.epa.gov/dockets.

II. Summary of Petitioned-For Exemptions

    In the Federal Register of December 15, 2017 (82 FR 59604) (FRL-
9970-50), EPA issued a document pursuant to FFDCA section 408(d)(3), 21 
U.S.C. 346a(d)(3), announcing the filing of a pesticide petition (PP 
4F8325) by ICA Trinova, Inc., 1 Beavers Street, Suite B, Newnan, GA 
30263. The petition requested that EPA (1) establish a tolerance for 
residues of chlorate in or on cantaloupes at 1.5 parts per million 
(ppm), and (2) establish an exemption from the requirement of a 
tolerance for residues of chlorate in or on tomatoes. Chlorate is a by-
product of chlorine dioxide, which is generated from the active 
ingredient, sodium chlorite, when it is applied via fumigation to 
tomatoes and cantaloupes post- harvest, during storage and shipment. 
The Agency reviewed submitted residue chemistry data for chlorine 
dioxide and chlorate. Given that residues for chlorine dioxide were not 
detected and only residues of chlorate were quantified, EPA has 
determined that tolerance exemptions are appropriate for chlorate on 
both tomatoes and cantaloupes.
    A summary of the petition prepared by ICA Trinova Inc., the 
petitioner and registrant is available in the docket, http://www.regulations.gov. Comments were received on the notice of filing; 
the Agency's response to these comments is located in Unit IV.B. of 
this document. For reasons explained in Unit IV.C., EPA is establishing 
an exemption from the requirement of a tolerance for residues of 
chlorate in or on cantaloupe and tomato.

III. Aggregate Risk Assessment and Determination of Safety

    Section 408(c)(2)(A)(i) of FFDCA allows EPA to establish an 
exemption from the requirement of a tolerance (the legal limit for a 
pesticide chemical residue in or on a food) only if EPA determines that 
the tolerance is ``safe.'' Section 408(c)(2)(A)(ii) of FFDCA defines 
``safe'' to mean that ``there is a reasonable certainty that no harm 
will result from aggregate exposure to the pesticide chemical residue, 
including all anticipated dietary exposures and all other exposures for 
which there is reliable information.'' This includes exposure through 
drinking water and in residential settings, but does not include 
occupational exposure. In making this safety determination, EPA must 
take into consideration the factors laid out in section 408(b)(2)(C) 
and (D). Specifically, section 408(b)(2)(C) of FFDCA requires EPA to 
give special consideration to exposure of infants and children to the 
pesticide chemical residue in establishing a tolerance and to ``ensure 
that there is a reasonable certainty that no harm will result to 
infants and children from aggregate exposure to the pesticide chemical 
residue. . . .''
    Consistent with FFDCA section 408(b)(2)(D), and the factors 
specified therein, EPA has reviewed the available scientific data and 
other relevant information in support of this action. EPA has 
sufficient data to assess the hazards of and to make a determination on 
aggregate exposure for chlorate including exposure resulting from the 
tolerances established by this action. EPA's assessment of exposures 
and risks associated with chlorate follows.

A. Toxicological Profile

    EPA has evaluated the available toxicity data and considered its 
validity, completeness, and reliability as well as the relationship of 
the results of the studies to human risk. EPA has also considered 
available information concerning the variability of the sensitivities 
of major identifiable subgroups of consumers, including infants and 
children.
    Sodium chlorite is the active ingredient that is applied to the 
tomatoes and cantaloupe. Once applied, it is activated by a weak acid, 
creating gaseous chlorine dioxide. As chlorine dioxide is released, it 
also produces the byproduct, chlorate. Based on submitted residue data, 
the only residues of the pesticide with the potential for being present 
on food commodities are chlorate ions; therefore, the Agency assessed 
the safety of aggregate exposure to chlorate in support of this 
tolerance action.
    Inorganic chlorates (also known as chlorate salts) encompass all 
chlorates including the most abundant salt, sodium chlorate. Toxicology 
data relevant to the human health risk assessment are summarized here 
and more information about the toxicology data and references can be 
found in the Risk Assessment of Tomato and Cantaloupe Fumigation with 
Sodium Chlorite 3.2% (chlorine dioxide gas) and Inorganic Chlorates 
Human Health Assessment Scoping Document in Support of Registration 
Review (Docket ID No. EPA-HQ-OPP-2016-0080-0008) both of which can be 
found in the docket for this action at http://www.regulations.gov.
    The hazard database indicates that the thyroid is the primary 
target organ of chlorate. Effects observed in subchronic and chronic 
toxicity studies show increased thyroid gland weights, colloid 
depletion, decreases in triiodothyronine (T3) and thyroxine (T4) 
accompanied by increases in thyroid stimulating hormone (TSH), 
increased incidence of thyroid follicular cell hypertrophy, thyroid 
cell mineralization, follicular cell hyperplasia, and adenomas or 
carcinomas in rat studies. Other effects include hematological changes 
(hemoglobin concentration, hematocrit, decreased red blood counts 
(RBC), and increased reticulocyte counts in females), methemoglobin 
concentration changes, and pituitary vacuolization in subchronic 
studies starting at doses 10-fold higher than where thyroid effects are 
observed.
    In a 2-year drinking water study, there was some evidence of 
thyroid gland follicular cell tumors in male rats; however, because 
chlorate is not mutagenic and these tumors were only seen at high 
doses, chlorate is not likely to be carcinogenic since the chronic 
reference dose is below the dose at which alteration of thyroid hormone 
homeostasis occurs. Moreover, although there was equivocal and marginal 
evidence of increased pancreatic islet carcinoma in female mice, the 
Agency has concluded that the selected chronic reference dose is 
protective of these potential cancer effects.
    No increased qualitative or quantitative susceptibility in rats or 
rabbits was seen in reproduction and developmental studies with 
chlorate. Chlorate did not cause developmental effects in rats at doses 
up to the limit dose (1,000 mg/kg/day) or in rabbits up to half the 
limit dose. Although chlorate has not been evaluated for neurotoxic 
effects, acute and subchronic toxicity studies do not indicate any 
neurotoxic potential. In a 2-generation reproduction toxicity study, 
increased absolute and relative thyroid weight and increased incidence 
of slight to moderate hyperactivity of the thyroid glands were reported 
in parental and adult F1 males and females at doses 14x higher than the

[[Page 66140]]

thyroid effects identified in the adult rat subchronic and chronic 
studies.
    The chronic oral toxicity of chlorate was examined in a study 
conducted by the National Toxicology Program (NTP). In this study, 
Fischer 344 rats (50/sex/group) were exposed to drinking water 
containing 0, 125, 1,000, or 2,000 mg/L chlorate for 2 years 
(equivalent to 5/5, 35/45, and 75/95 mg/kg/day (males/females)). T4 and 
T3 levels were significantly reduced at 35 and 75 mg/kg/day on day 4, 
and in 75 mg/kg/day males and females at week 3. TSH was significantly 
increased in 35 and 75 mg/kg/day males on day 4 and at week 3, in 35 
and 75 mg/kg/day females on day 4, in 75 mg/kg/day females at week 3, 
and in 75 mg/kg/day males and females at week 13. At the high dose, 
increased incidences of thyroid gland follicular cell carcinoma were 
seen in male rats (incidence: 4/47) compared to none in controls, and 
of thyroid gland follicular cell adenoma or carcinoma (combined) in 
males (incidence: 6/47) and females (incidence: 4/46) compared to one 
animal in controls of both sexes. The incidences of thyroid gland 
follicular cell hypertrophy were significantly increased in mid- and 
high-dose groups of males (33/43 and 40/47 vs. 4/47 in control) and 
females (3/47, 7/47, 27/43, 42/46 vs. 3/47 in control).
    In the Agency's 2006 risk assessment for inorganic chlorates, 
Revised Inorganic Chlorates. HED Chapter of the Reregistration 
Eligibility Decision Document (RED) (Docket ID No. EPA-HQ-OPP-2005-
0507-0004) a lower 95% confidence limit of the benchmark dose (BMDL) of 
0.9 mg/kg/day was derived, based on thyroid gland follicular cell 
hypertrophy at the 5 mg/kg/day dose from the rat chronic cancer study 
(NTP, 2005). EPA has re-considered the data and determined that the 
original benchmark dose derived from the study was not sufficiently 
supported as an effect level at 5 mg/kg/day, and that the 5 mg/kg/day 
dose can be supported as a NOAEL for the study. The point of departure 
(POD) for chronic dietary (all populations) exposures is thus the 5 mg/
kg/day dose, based on changes in thyroid hormones (decreased T3, 
decreased T4, and increased TSH), and increased incidence of thyroid 
follicular cell hypertrophy in male and female rats at the next highest 
dose of 35/45 mg/kg/day (males and females respectively). 
Mineralization of the thyroid at the 5 mg/kg/day dose level was not 
considered to be adverse.
    Specific information on the studies received and the nature of the 
adverse effects caused by chlorate as well as the no-observed-adverse-
effect-level (NOAEL) and the lowest-observed-adverse-effect-level 
(LOAEL) from the toxicity studies can be found at http://www.regulations.gov in the document titled ``Risk Assessment of Tomato 
and Cantaloupe Fumigation with Sodium Chlorite 3.2% (chlorine dioxide 
gas) in docket ID number EPA-HQ-OPP-2017-0063.

B. Toxicological Points of Departure/Levels of Concern

    Once a pesticide's toxicological profile is determined, EPA 
identifies toxicological POD and levels of concern to use in evaluating 
the risk posed by human exposure to the pesticide. For hazards that 
have a threshold below which there is no appreciable risk, the 
toxicological POD is used as the basis for derivation of reference 
values for risk assessment. PODs are developed based on a careful 
analysis of the doses in each toxicological study to determine the 
NOAEL and the LOAEL. Uncertainty/safety factors are used in conjunction 
with the POD to calculate a safe exposure level--generally referred to 
as a population-adjusted dose (PAD) or a reference dose (RfD)--and a 
safe margin of exposure (MOE). For non-threshold risks, the Agency 
assumes that any amount of exposure will lead to some degree of risk. 
Thus, the Agency estimates risk in terms of the probability of an 
occurrence of the adverse effect expected in a lifetime. For more 
information on the general principles EPA uses in risk characterization 
and a complete description of the risk assessment process, see http://www2.epa.gov/pesticide-science-and-assessing-pesticide-risks/assessing-human-health-risk-pesticides.
    A summary of the toxicological endpoints from the documents 
referenced in section III, A, for chlorate used for human risk 
assessment is shown in Table 1.

                 Table 1--Toxicology Endpoints for Use in Chlorate Human Health Risk Assessments
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                                                                    RfD, PAD,
                                                  Uncertainty/       level of
      Exposure/scenario            Point of       FQPA safety      concern for        Study and toxicological
                                  departure         factors            risk                   effects
                                                                    assessment
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Acute dietary (All             N/A............  N/A............  N/A............  None of the available studies
 populations, including                                                            provided an endpoint of
 infants and children, and                                                         toxicity attributable to a
 females 13--49 years of age).                                                     single exposure.
Chronic dietary (All           RfD = cPAD =     UF = 30x (10x    NOAEL = 5 mg/kg/ 2 year NTP Study (2005)--rat.
 populations).                  0.17 mg/kg/day.  intraspecies,    day.            MRID 49683134.
                                                 3x                               LOAEL = 35/45 mg/kg/day (male/
                                                 interspecies)                     female) based on changes in
                                                 FQPA SF = 1x.                     thyroid hormones after 3
                                                                                   weeks (decreased T4, T3, &
                                                                                   increased TSH), increased
                                                                                   incidence of thyroid gland
                                                                                   follicular cell hypertrophy
                                                                                   in males and females (after 3
                                                                                   weeks and 2 years).
                              ----------------------------------------------------------------------------------
Cancer (Oral, dermal,             The chronic reference dose will be protective of potential carcinogenicity.
 inhalation).
----------------------------------------------------------------------------------------------------------------
UF = uncertainty factor, FQPA SF = Special FQPA safety factor, NOAEL = no observed adverse effect level, LOAEL =
  lowest observed adverse effect level, PAD = population adjusted dose (a = acute, c = chronic) RfD = reference
  dose, MOE = margin of exposure, LOC = level of concern, N/A = not applicable

C. Exposure Assessment

    1. Dietary exposure from food and feed uses. In evaluating dietary 
exposure to chlorate, EPA considered exposure under the petitioned-for 
tolerance and exemption as well as existing exposures to chlorate. EPA 
assessed dietary exposures from chlorate in food as follows:
    i. Acute exposure. Quantitative acute dietary exposure and risk 
assessments are performed for a food-use pesticide, if a toxicological 
study has indicated the possibility of an effect of concern

[[Page 66141]]

occurring as a result of a 1-day or single exposure.
    No such effects were identified in the toxicological studies for 
chlorate; therefore, a quantitative acute dietary exposure assessment 
is unnecessary.
    ii. Chronic exposure. In conducting the chronic dietary exposure 
assessment, EPA separately assessed the components of chronic dietary 
exposure and then aggregated them for assessing chronic risk. For 
existing food crop uses, EPA relied on the assessment of food crop 
exposures contained in the 2006 Inorganic Chlorates Reregistration 
Eligibility Document. For the petitioned-for use on cantaloupe, EPA 
based its assessment on the current version of Dietary Exposure 
Evaluation Model--Food Consumption Intake Database--DEEM-
FCIDTM (version 3.16), the food consumption data from the 
2003-2008 U.S. Department of Agriculture's National Health and 
Nutrition Examination Survey, What We Eat in America, (NHANES/WWEIA), 
and assumed 100 percent of the cantaloupe crop treated. For the dietary 
exposure resulting from use in paper mills, EPA based its exposure 
assessment on standard operating procedure screening-level analyses 
reported in the registration review human health scoping document, 
Inorganic Chlorates Human Health Assessment Scoping Document in Support 
of Registration Review.
    iii. Cancer. Based on the data summarized in Unit III.A., EPA has 
concluded that a nonlinear RfD approach is appropriate for assessing 
cancer risk to chlorate. Cancer risk was assessed using the same 
exposure estimates as discussed in Unit III.C.1. ii.
    iv. Anticipated residue and Percent Crop Treated (PCT) information. 
EPA used anticipated residue information and PCT estimates in the 
dietary food assessment.
    Section 408(b)(2)(E) of FFDCA authorizes EPA to use available data 
and information on the anticipated residue levels of pesticide residues 
in food and the actual levels of pesticide residues that have been 
measured in food. If EPA relies on such information, EPA must require 
pursuant to FFDCA section 408(f)(1) that data be provided 5 years after 
the tolerance is established, modified, or left in effect, 
demonstrating that the levels in food are not above the levels 
anticipated. For the present action, EPA will issue such data call-ins 
as are required by FFDCA section 408(b)(2)(E) and authorized under 
FFDCA section 408(f)(1). Data will be required to be submitted no later 
than 5 years from the date of issuance of these tolerances.
    Section 408(b)(2)(F) of FFDCA states that the Agency may use data 
on the actual percent of food treated for assessing chronic dietary 
risk only under the following conditions:
     Condition a: The data used are reliable and provide a 
valid basis to show what percentage of the food derived from such crop 
is likely to contain the pesticide residue.
     Condition b: The exposure estimate does not underestimate 
exposure for any significant subpopulation group.
     Condition c: Data are available on pesticide use and food 
consumption in a particular area and the exposure estimate does not 
understate exposure for the population in such area. In addition, the 
Agency must provide for periodic evaluation of any estimates used. To 
provide for the periodic evaluation of the estimate of PCT as required 
by FFDCA section 408(b)(2)(F), EPA may require registrants to submit 
data on PCT.
    The Agency estimated the PCT for existing uses for the chronic 
dietary exposure assessment as follows: corn: <1%; cotton (seed 
treatment): 5%; dry beans/peas: <1%; flaxseed: <1%; peppers (chili 
peppers): <1%; potatoes; <1%; rice: 1%; safflower (seed treatment): 2%; 
sorghum: <1%; soybeans: 5%; soybeans (seed treatment): <1%; sunflower 
(seed treatment): <1%; sweet corn: <1%; wheat: 1%; and wheat seed (seed 
treatment): <1%. For crops not specified, 100% PCT was used.
    In most cases, EPA uses available data from United States 
Department of Agriculture/National Agricultural Statistics Service 
(USDA/NASS), proprietary market surveys, and California Department of 
Pesticide Regulation (CalDPR) Pesticide Use Reporting (PUR) for the 
chemical/crop combination for the most recent 10 years. EPA uses an 
average PCT for chronic dietary risk analysis and a maximum PCT for 
acute dietary risk analysis. The average PCT figures for each existing 
use are derived by combining available public and private market survey 
data for that use, averaging across all observations, and rounding up 
to the nearest 5%, except for those situations in which the average PCT 
is less than 1% or less than 2.5%. In those cases, the Agency would use 
less than 1% or less than 2.5% as the average PCT value, respectively. 
The maximum PCT figure is the highest observed maximum value reported 
within the most recent 10 years of available public and private market 
survey data for the existing use and rounded up to the nearest multiple 
of 5%, except where the maximum PCT is less than 2.5%, in which case, 
the Agency uses less than 2.5% as the maximum PCT.
    2. Dietary exposure from drinking water. The estimated drinking 
water concentration (EDWC) was obtained from monitoring data gathered 
between 2013-2015 and are contained in the Six-Year Review Technical 
Report for Chlorate. For purposes of this assessment, EPA used the 
median concentration of 120 micrograms/liter.
    3. From non-dietary exposure. The term ``residential exposure'' is 
used in this document 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). At this time, there 
are no longer any registered uses of chlorate that result in non-
occupational, residential exposures.
    4. Cumulative effects from substances with a common mechanism of 
toxicity. Section 408(b)(2)(D)(v) of FFDCA requires that, when 
considering whether to establish, modify, or revoke a tolerance, the 
Agency consider ``available information'' concerning the cumulative 
effects of a particular pesticide's residues and ``other substances 
that have a common mechanism of toxicity.''
    EPA has not found inorganic chlorates to share a common mechanism 
of toxicity with any other substances, and chlorate does not appear to 
produce a toxic metabolite produced by other substances. For the 
purposes of this tolerance action, therefore, EPA has assumed that 
chlorate does not have a common mechanism of toxicity with other 
substances. For information regarding EPA's efforts to determine which 
chemicals have a common mechanism of toxicity and to evaluate the 
cumulative effects of such chemicals, see EPA's website at http://www2.epa.gov/pesticide-science-and-assessing-pesticide-risks/cumulative-assessment-risk-pesticides.

D. Safety Factor for Infants and Children

    1. In general, section 408(b)(2)(C) of FFDCA provides that EPA 
shall apply an additional tenfold (10X) margin of safety for infants 
and children in the case of threshold effects to account for prenatal 
and postnatal toxicity and the completeness of the database on toxicity 
and exposure unless EPA determines based on reliable data that a 
different margin of safety will be safe for infants and children. This 
additional margin of safety is commonly referred to as the FQPA Safety 
Factor (SF). In applying this provision, EPA either retains the default 
value of 10x, or uses a different

[[Page 66142]]

additional safety factor when reliable data available to EPA support 
the choice of a different factor.
    2. Prenatal and postnatal sensitivity. No increased qualitative or 
quantitative susceptibility in rats or rabbits was seen in reproduction 
and developmental studies with chlorate. Chlorate did not cause 
developmental effects in rats at doses up to 1,000 mg/kg/day or in 
rabbits at doses up to 500 mg/kg/day. No pre- or postnatal 
susceptibility was observed in a reproduction study in rats.
    3. Conclusion. EPA has determined that reliable data show the 
safety of infants and children would be adequately protected if the 
FQPA SF were reduced to 1x. That decision is based on the following 
findings:
    i. The toxicity database for chlorate is adequate to characterize 
the potential for prenatal or postnatal risk for infants and children.
    ii. There is no indication in the available database that chlorate 
is a neurotoxicant.
    iii. There was no pre- or postnatal sensitivity or susceptibility 
observed in the submitted developmental studies in rats and rabbits and 
the 2-generation reproduction study in rats.
    iv. There are no residual uncertainties identified in the exposure 
databases. The dietary assessment is based on a conservative estimate 
of dietary exposures and drinking water monitoring data. These 
assessments will not underestimate the exposure and risks posed by 
chlorate.

E. Aggregate Risks and Determination of Safety

    EPA determines whether acute and chronic dietary pesticide 
exposures are safe by comparing aggregate exposure estimates to the 
acute PAD (aPAD) and chronic PAD (cPAD). For linear cancer risks, EPA 
calculates the lifetime probability of acquiring cancer given the 
estimated aggregate exposure. Short-, intermediate-, and chronic-term 
risks are evaluated by comparing the estimated aggregate food, water, 
and residential exposure to the appropriate PODs to ensure that an 
adequate MOE exists.
    1. Acute risk. An acute aggregate risk assessment takes into 
account acute exposure estimates from dietary consumption of food and 
drinking water. No adverse effect resulting from a single oral exposure 
was identified and no acute dietary endpoint was selected. Therefore, 
chlorate is not expected to pose an acute risk.
    2. Chronic risk. Using the exposure assumptions described in this 
unit for chronic exposure, EPA has concluded that chronic exposure to 
chlorate from food and water will utilize 8.4% of the cPAD for children 
1-2 years old, the population group receiving the greatest exposure. 
There are no residential pesticide uses for chlorate.
    3. Short- and Intermediate-term risk. Short- and intermediate-term 
aggregate exposure takes into account short- and intermediate-term 
residential exposure plus chronic exposure to food and water 
(considered to be a background exposure level).
    Short- and intermediate-term adverse effects were identified; 
however, chlorate is not registered for any use patterns that would 
result in either short- or intermediate-term residential exposure. 
Short- and intermediate-term risk is assessed based on short- and 
intermediate-term residential exposure plus chronic dietary exposure. 
Because there is no short- or intermediate-term residential exposure 
and chronic dietary exposure has already been assessed under the 
appropriately protective cPAD (which is at least as protective as the 
POD used to assess short- and intermediate-term risk), no further 
assessment of short- or intermediate-term risk is necessary, and EPA 
relies on the chronic dietary risk assessment for evaluating short- and 
intermediate-term risk for chlorate.
    4. Aggregate cancer risk for U.S. population. A cancer aggregate 
assessment was not conducted separately, as the chronic aggregate 
assessment is protective of cancer for the general U.S. population. 
Based on the results of the assessment of chronic risk, the Agency 
concludes that exposure to chlorate will not result in a cancer risk of 
concern.
    5. Determination of safety. Based on these risk assessments, EPA 
concludes that there is a reasonable certainty that no harm will result 
to the general population, or to infants and children from aggregate 
exposure to chlorate residues.

IV. Other Considerations

A. Analytical Enforcement Methodology

    An analytical method is not required for enforcement purposes since 
the Agency is establishing an exemption from the requirement of a 
tolerance without any numerical limitation.

B. Response to Comments

    Two comments were received in response to the Notice of Filing, 
neither of which raised issues related to the safety of the tolerances 
in this action. Because they raise issues outside the scope of this 
rulemaking, the Agency is not addressing them here.

C. Revisions to Petitioned-For Tolerances

    The residue data indicate that following use of the pesticide, 
there were detectable chlorate residues on the cantaloupe rind, 
although none were detected in the edible portions of the cantaloupe, 
and that chlorate residues on tomato were indistinguishable from 
background levels of chlorate on tomato. Because EPA does not 
anticipate use on either commodity to contribute to dietary exposure, 
EPA is issuing an exemption from the requirement of tolerance residues 
on cantaloupe and tomato. This tolerance exemption covers potential 
residues in or on these commodities as a result of direct application 
and allows for the shipment of these commodities in interstate 
commerce.

V. Conclusion

    An exemption from the requirement of a tolerance is established for 
residues of chlorate in or on tomato and cantaloupe.

VI. Statutory and Executive Order Reviews

    This action establishes an exemption from the requirement of a 
tolerance under FFDCA section 408(d) in response to a petition 
submitted to the Agency. The Office of Management and Budget (OMB) has 
exempted these types of actions from review under Executive Order 
12866, entitled ``Regulatory Planning and Review'' (58 FR 51735, 
October 4, 1993). Because this action has been exempted from review 
under Executive Order 12866, this action is not subject to Executive 
Order 13211, entitled ``Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use'' (66 FR 
28355, May 22, 2001) or Executive Order 13045, entitled ``Protection of 
Children from Environmental Health Risks and Safety Risks'' (62 FR 
19885, April 23, 1997), nor is it considered a regulatory action under 
Executive Order 13771, entitled ``Reducing Regulations and Controlling 
Regulatory Costs'' (82 FR 9339, February 3, 2017). This action does not 
contain any information collections subject to OMB approval under the 
Paperwork Reduction Act (PRA) (44 U.S.C. 3501 et seq.), nor does it 
require any special considerations under Executive Order 12898, 
entitled ``Federal Actions to Address Environmental Justice in Minority 
Populations and Low-Income Populations'' (59 FR 7629, February 16, 
1994).
    Since tolerances and exemptions that are established on the basis 
of a petition

[[Page 66143]]

under FFDCA section 408(d) do not require the issuance of a proposed 
rule, the requirements of the Regulatory Flexibility Act (RFA) (5 
U.S.C. 601 et seq.), do not apply.
    This action directly regulates growers, food processors, food 
handlers, and food retailers, not States or tribes, nor does this 
action alter the relationships or distribution of power and 
responsibilities established by Congress in the preemption provisions 
of FFDCA section 408(n)(4). As such, the Agency has determined that 
this action will not have a substantial direct effect on States or 
tribal governments, on the relationship between the national government 
and the States or tribal governments, or on the distribution of power 
and responsibilities among the various levels of government or between 
the Federal Government and Indian tribes. Thus, the Agency has 
determined that Executive Order 13132, entitled ``Federalism'' (64 FR 
43255, August 10, 1999) and Executive Order 13175, entitled 
``Consultation and Coordination with Indian Tribal Governments'' (65 FR 
67249, November 9, 2000) do not apply to this action. In addition, this 
action does not impose any enforceable duty or contain any unfunded 
mandate as described under Title II of the Unfunded Mandates Reform Act 
(UMRA) (2 U.S.C. 1501 et seq.).
    This action does not involve any technical standards that would 
require Agency consideration of voluntary consensus standards pursuant 
to section 12(d) of the National Technology Transfer and Advancement 
Act (NTTAA) (15 U.S.C. 272 note).

VII. Congressional Review Act

    Pursuant to the Congressional Review Act (5 U.S.C. 801 et seq.), 
EPA will submit a report containing this rule and other required 
information to the U.S. Senate, the U.S. House of Representatives, and 
the Comptroller General of the United States prior to publication of 
the rule in the Federal Register. This action is not a ``major rule'' 
as defined by 5 U.S.C. 804(2).

List of Subjects in 40 CFR Part 180

    Environmental protection, Administrative practice and procedure, 
Agricultural commodities, Pesticides and pests, Reporting and 
recordkeeping requirements.

    Dated: November 30, 2018.
Anita Pease,
Acting Director, Antimicrobial Division, Office of Pesticide Programs.

    Therefore, 40 CFR chapter I is amended as follows:

PART 180--[AMENDED]

0
1. The authority citation for part 180 continues to read as follows:

    Authority: 21 U.S.C. 321(q), 346a and 371.

0
2. Add Sec.  180.1364 to subpart D to read as follows:

Sec.  180.1364  Chlorate; exemption from the requirement of a 
tolerance.

    Residues of chlorate in or on tomato and cantaloupe are exempt from 
the requirement of a tolerance when resulting from the application of 
gaseous chlorine dioxide as a fungicide, bactericide, and antimicrobial 
pesticide.

[FR Doc. 2018-27908 Filed 12-21-18; 8:45 am]
 BILLING CODE 6560-50-P