PMEP Home Page --> Pesticide Active Ingredient Information --> Herbicides, Growth Regulators and Desiccant --> 2,4-D to butylate (Sutan) --> 2,6-Diisopropylnaphthalene --> 2,6-Diisopropylnaphthalene Temporary Exemption from Tolerance Requirement 9/99

2,6-Diisopropylnaphthalene Temporary Exemption from Tolerance Requirement 9/99

[Federal Register: September 22, 1999 (Volume 64, Number 183)]
[Rules and Regulations]               
[Page 51245-51248]
>From the Federal Register Online via GPO Access []



40 CFR Part 180

[OPP-300918; FRL-6381-7]
RIN 2070-AB78

2,6-Diisopropylnapthalene; Temporary Exemption From the 
Requirement of a Tolerance

AGENCY: Environmental Protection Agency (EPA).
ACTION: Final rule.


SUMMARY: This regulation establishes a temporary exemption from the 
requirement of a tolerance for residues of the biochemical pesticide 
2,6-diisopropylnapthalene (2,6-DIPN) when applied/used to inhibit 
sprouting in potatoes held in storage. Platte Chemical Company 
submitted a petition to EPA under the Federal Food, Drug, and Cosmetic 
Act, as amended by the Food Quality Protection Act of 1996 requesting 
the temporary tolerance exemption. This regulation eliminates the need 
to establish a maximum permissible level for residues of 2,6-DIPN. The 
temporary tolerance exemption will expire on September 22, 2000.

DATES: This regulation is effective September 22, 1999. Objections and 
requests for hearings, identified by docket control number OPP-300918, 
must be received by EPA on or before November 22, 1999.

ADDRESSES: Written objections and hearing requests may be submitted by 
mail, in person, or by courier. Please follow the detailed instructions 
for each method as provided under Unit VIII. To ensure proper receipt 
by EPA, your objections and hearing requests must identify docket 
control number OPP-300918 in the subject line on the first page of your 

FOR FURTHER INFORMATION CONTACT: By mail: Driss Benmhend, c/o Product 
Manager (PM) 90, Biopesticides and Pollution Prevention Division 
(7511C), Environmental Protection Agency, 401 M St., SW., Washington, 
DC 20460; telephone number: (703-308-9525); and e-mail address:


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            Potentially
                                                       Affected Entities
Potato Processors                 311                 Food 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 

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 
To access this document, on the Home Page select ``Laws and 
Regulations'' 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
    2. In person. The Agency has established an official record for 
this action under docket control number OPP-300918. The official record 
consists of the documents specifically referenced in this action, 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 Hwy., 
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.

II. Background and Statutory Findings

     In the Federal Register of November 25, 1998 (63 FR 65204) (FRL-
6039-7), EPA issued a notice pursuant to section 408 of the Federal 
Food, Drug, and Cosmetic Act (FFDCA), 21 U.S.C. 346a, as amended by the 
Food Quality Protection Act (FQPA) (Public Law 104-170) announcing the 
filing of a pesticide tolerance petition by Platte Chemical Company, 
419 18th Street, Greeley, CO 80632. This notice included a summary of 
the petition prepared by the petitioner Platte Chemical Company. There 
were no comments received in response to the notice of filing.
    The petition requested that 40 CFR part 180 be amended by 
establishing a temporary exemption from the requirement of a tolerance 
for residues of 2,6-DIPN.
    New section 408(c)(2)(A)(i) of the FFDCA allows EPA to establish an

[[Page 51246]]

exemption from the requirement for a tolerance (the legal limit for a 
pesticide chemical residue in or on a food) only if EPA determines that 
the exemption is ``safe.'' Section 408(c)(2)(A)(ii) 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. Section 408(b)(2)(C) 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. . . .'' Additionally, section 408(b)(2)(D) requires that 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 performs a number of analyses to determine the risks from 
aggregate exposure to pesticide residues. First, EPA determines the 
toxicity of pesticides. Second, EPA examines exposure to the pesticide 
through food, drinking water, and through other exposures that occur as 
a result of pesticide use in residential settings.

III. Toxicological Profile

    Consistent with section 408(b)(2)(D) of the FFDCA, EPA has reviewed 
the available scientific data and other relevant information in support 
of this action and considered its validity, completeness, and 
reliability and the relationship of this information 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.
    1. Acute toxicity. Technical 2,6-DIPN exhibits low acute toxicity. 
It is a toxicity category IV biopesticide. The rat oral LD<INF>50</INF> 
is greater than 5,000 milligrams/kilograms (mg/kg), the rabbit dermal 
LD<INF>50</INF> is greater than 5,000 mg/kg, and the rat inhalation 
LC<INF>50</INF> is greater than 2.60 mg/L at the maximum attainable 
condition. In addition, 2,6-DIPN is not a skin sensitizer in guinea 
pigs, shows no dermal irritation at 72 hours in rabbits, and shows 
minimal ocular irritation in rabbits. The end use formulation is the 
same as the technical formulation; it contains no intentionally added 
inert ingredients.
    2. Genotoxicity. Short-term assays for genotoxicity consisting of a 
bacterial reverse mutation assay (Ames test), an in vivo/in vitro 
unscheduled DNA synthesis in rat primary hepatocyte cultures at two 
time points, and an in vivo mouse micronucleus assay have been 
conducted for 2,6-DIPN. These studies show a lack of genotoxicity for 
    3. Other tests. No additional mammalian toxicology testing has been 
conducted. Platte requested a waiver from the requirement to submit 
further mammalian toxicology studies on the basis of the favorable 
toxicological profile for 2,6-DIPN, the low residues observed in 
treated potatoes, the specific plant growth regulator mode of action, 
and the confined nature of the proposed use. No data were found in the 
literature that would indicate 2,6-DIPN has any adverse effect on 
mammals. No incidents of hypersensitivity or any other adverse effects 
have been observed in individuals handling the material over the past 6 

IV. Aggregate Exposures

    In examining aggregate exposure, section 408 of the FFDCA directs 
EPA to consider available information concerning exposures from the 
pesticide residue in food and all other non-occupational exposures, 
including drinking water from ground water or surface water and 
exposure through pesticide use in gardens, lawns, or buildings 
(residential and other indoor uses).

A. Dietary Exposure

    Any dietary exposure resulting from applications made under an 
experimental use permit (EUP) would be through potato consumption and 
animal products in which animals are fed potato feed stocks.
    1. Food. Residues in treated potatoes have been shown to be low 
(average residue was 0.08 ppm 90 days after treatment). Residues would 
be expected to continue to decline after potatoes are removed from 
storage and before consumption. Cooking and/or processing would be 
expected to further lower the residue level in consumed potatoes or 
potato products
    2. Drinking water exposure. Since 2,6-DIPN would only be used in 
commercial storage warehouses, there is little if any potential for 
drinking water exposure.

B. Other Non-Occupational Exposure

    The EUP would only cover use for direct application to potatoes 
when stored in commercial warehouses. There are currently no other 
registered uses of 2,6-DIPN. Non-dietary exposure to 2,6-DIPN via lawn 
care, topical treatments, etc., will not occur. Thus, the potential for 
non-occupational exposure to the general population is virtually non-

V. Cumulative Effects

    EPA also is required to consider the potential for cumulative 
effects of 2,6-DIPN and other substances that have a common mechanism 
of toxicity. Consideration of a common mode of toxicity is not 
appropriate, given that there is no indication of mammalian toxicity of 
2,6-DIPN and no information that indicates toxic effects, if any, would 
be cumulative with any other compounds. Since, 2,6-DIPN does not 
exhibit a toxic mode of action in the target plant, it is appropriate 
to consider only the potential risks of 2,6-DIPN in this exposure 

 VI. Determination of Safety for U.S. Population, Infants and 

    Since there are no anticipated residues in drinking water or from 
other non-occupational sources, and no reliable information exists on 
cumulative effects due to a common mechanism of toxicity, the aggregate 
exposure to 2,6-DIPN is adequately represented by the dietary route. 
The lack of toxicity of 2,6-DIPN has been demonstrated by the results 
of acute toxicity testing in mammals in which 2,6-DIPN caused no 
adverse effects when dosed orally, dermally, and via inhalation at the 
limit dose for each study. Anticipated residues in consumed potatoes 
are low. Moreover, 2,6-DIPN exhibits close structural and chemical 
similarity to other plant-based, naturally occurring methyl and 
isopropyl naphthalene. Thus, the dietary exposure to 2,6-DIPN should 
pose negligible risks to human health. Based on the lack of toxicity 
and low exposure, there is a reasonable certainty that no harm to 
infants, children, or adults will result from aggregate exposure to 
2,6-DIPN residues. Exempting 2,6-DIPN from the requirement of a 
tolerance should pose no significant risk to humans or the environment.

 VII. Other Considerations

A. Analytical Method

    An analytical method for residues is not applicable, as this 
proposes an exemption from the requirement of a tolerance.

B. Codex Maximum Residue Level

    No Codex maximum residue levels are established for residues of 
2,6-DIPN in or on any food or feed crop. There are no other established 
U.S. tolerances or

[[Page 51247]]

exemptions from tolerances for 2,6-DIPN food or feed crops in the 
United States. The Agency has classified 2,6-DIPN as a biochemical 

VIII. Objections and Hearing Requests

    Under section 408(g) of the FFDCA, as amended by the FQPA, any 
person may file an objection to any aspect of this regulation and may 
also request a hearing on those objections. The EPA procedural 
regulations which govern the submission of objections and requests for 
hearings appear in 40 CFR part 178. Although the procedures in those 
regulations require some modification to reflect the amendments made to 
the FFDCA by the FQPA of 1996, EPA will continue to use those 
procedures, with appropriate adjustments, until the necessary 
modifications can be made. The new section 408(g) provides essentially 
the same process for persons to ``object'' to a regulation for an 
exemption from the requirement of a tolerance issued by EPA under new 
section 408(d), as was provided in the old FFDCA sections 408 and 409. 
However, the period for filing objections is now 60 days, rather than 
30 days.

A. What Do I Need to Do to File an Objection or Request a Hearing?

    You must file your objection or request a hearing on this 
regulation in accordance with the instructions provided in this unit 
and in 40 CFR part 178. To ensure proper receipt by EPA, you must 
identify docket control number OPP-300918 in the subject line on the 
first page of your submission. All requests must be in writing, and 
must be mailed or delivered to the Hearing Clerk on or before November 
22, 1999.
    1. Filing the request. Your objection must specify the specific 
provisions in the regulation that you object to, and the grounds for 
the objections (40 CFR 178.25) as well as other requirements set forth 
in 40 CFR 178.25. If a hearing is requested, the objections must 
include a statement of the factual issues(s) on which a hearing is 
requested, the requestor's contentions on such issues, and a summary of 
any evidence relied upon by the objector (40 CFR 178.27). Information 
submitted in connection with an objection or hearing request may be 
claimed confidential 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. A copy of the information 
that does not contain CBI must be submitted for inclusion in the public 
record. Information not marked confidential may be disclosed publicly 
by EPA without prior notice.
    Mail your written request to: Office of the Hearing Clerk (1900), 
Environmental Protection Agency, 401 M St., SW., Washington, DC 20460. 
You may also deliver your request to the Office of the Hearing Clerk in 
Room M3708, Waterside Mall, 401 M St., SW., Washington, DC 20460. The 
Office of the Hearing Clerk is open from 8 a.m. to 4 p.m., Monday 
through Friday, excluding legal holidays. The telephone number for the 
Office of the Hearing Clerk is (202) 260-4865.
    2. Tolerance fee payment. If you file an objection or request a 
hearing, you must also pay the fee prescribed by 40 CFR 180.33(i) or 
request a waiver of that fee pursuant to 40 CFR 180.33(m). You must 
mail the fee to: EPA Headquarters Accounting Operations Branch, Office 
of Pesticide Programs, P.O. Box 360277M, Pittsburgh, PA 15251. Please 
identify the fee submission by labeling it ``Tolerance Petition Fees.''
    EPA is authorized to waive any fee requirement when in the judgment 
of the Administrator such a waiver or refund is equitable and not 
contrary to the purpose of this subsection.'' For additional 
information regarding the waiver of these fees, you may contact James 
Tompkins by phone at (703) 305-5697, by e-mail at, 
or by mailing a request for information to Mr. Tompkins at Registration 
Division (7505C), Office of Pesticide Programs, Environmental 
Protection Agency, 401 M St., SW., Washington, DC 20460.
    If you would like to request a waiver of the tolerance objection 
fees, you must mail your request for such a waiver to: James Hollins, 
Information Resources and Services Division (7502C), Office of 
Pesticide Programs, Environmental Protection Agency, 401 M St., SW., 
Washington, DC 20460.
    3. Copies for the Docket. In addition to filing an objection or 
hearing request with the Hearing Clerk as described in Unit VIII.A., 
you should also send a copy of your request to the PIRIB for its 
inclusion in the official record that is described in Unit I.B.2. Mail 
your copies, identified by docket number OPP-300918, to: Public 
Information and Records Integrity Branch, Information Resources and 
Services Division (7502C), Office of Pesticide Programs, Environmental 
Protection Agency, 401 M St., SW., Washington, DC 20460. In person or 
by courier, bring a copy to the location of the PIRIB described in Unit 
I.B.2. You may also send an electronic copy of your request via e-mail 
to: Please use an ASCII file format and avoid the 
use of special characters and any form of encryption. Copies of 
electronic objections and hearing requests will also be accepted on 
disks in WordPerfect 5.1/6.1 file format or ASCII file format. Do not 
include any CBI in your electronic copy. You may also submit an 
electronic copy of your request at many Federal Depository Libraries.

B. When Will the Agency Grant a Request for a Hearing?

    A request for a hearing will be granted if the Administrator 
determines that the material submitted shows the following: There is a 
genuine and substantial issue of fact; there is a reasonable 
possibility that available evidence identified by the requestor would, 
if established resolve one or more of such issues in favor of the 
requestor, taking into account uncontested claims or facts to the 
contrary; and resolution of the factual issues(s) in the manner sought 
by the requestor would be adequate to justify the action requested (40 
CFR 178.32).

IX. Regulatory Assessment Requirements

     This final rule establishes a temporary tolerance/exemption under 
section 408(d) of the FFDCA 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). This 
final rule does not contain any information collections subject to OMB 
approval under the Paperwork Reduction Act (PRA), 44 U.S.C. 3501 et 
seq., or impose any enforceable duty or contain any unfunded mandate as 
described under Title II of the Unfunded Mandates Reform Act of 1995 
(UMRA) (Public Law 104-4). Nor does it require prior consultation with 
State, local, and tribal government officials as specified by Executive 
Order 12875, entitled Enhancing the Intergovernmental Partnership (58 
FR 58093, October 28, 1993) and Executive Order 13084, entitled 
Consultation and Coordination with Indian Tribal Governments (63 FR 
27655, May 19, 1998), or special consideration of environmental justice 
related issues under Executive Order 12898, entitled Federal Actions to 
Address Environmental Justice in Minority Populations and Low-Income 
Populations (59 FR 7629, February 16, 1994) or require OMB review in 
accordance with Executive Order 13045, entitled Protection of Children 
from Environmental Health Risks and Safety Risks (62 FR 19885, April 
23, 1997). The Agency has determined that this action will not have a 
substantial direct effect on States, on the relationship between

[[Page 51248]]

the national government and the States, or on the distribution of power 
and responsibilities among the various levels of government, as 
specified in Executive Order 12612, entitled Federalism (52 FR 41685, 
October 30, 1987). This action directly regulates growers, food 
processors, food handlers and food retailers, not States. This action 
does not alter the relationships or distribution of power and 
responsibilities established by Congress in the preemption provisions 
of the Federal Food, Drug, and Cosmetic Act, 21 U.S.C. 346a(b)(4). 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 
of 1995 (NTTAA), Public Law 104-113, section 12(d) (15 U.S.C. 272 
note). In addition, since tolerances and exemptions that are 
established on the basis of a petition under FFDCA section 408(d), such 
as the a temporary tolerance/exemption in this final rule, 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.

X. Submission to Congress and the Comptroller General

     The Congressional Review Act, 5 U.S.C. 801 et seq., as added by 
the Small Business Regulatory Enforcement Fairness Act of 1996, 
generally provides that before a rule may take effect, the agency 
promulgating the rule must submit a rule report, which includes a copy 
of the rule, to each House of the Congress and to the Comptroller 
General of the United States. 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 this rule in the  Federal Register. This rule 
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: September 15, 1999.
Marcia E. Mulkey,
Director, Office of Pesticide Programs.
    Therefore, 40 CFR chapter I is amended as follows:


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

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

    2. Section 180.1208 is added to subpart D to read as follows:

Sec. 180.1208   2,6-Diisopropylnapthalene; temporary exemption from the 
requirement of a tolerance.

     2,6-Diisopropylnapthalene is temporarily exempt from the 
requirement of a tolerance when used to inhibit sprouting in potatoes 
held in storage in accordance with the Experimental Use Permit 034704-
EUP-13. The temporary exemption from the requirement of a tolerance 
will expire on September 22, 2000.

[FR Doc. 99-24694 Filed 9-21-99; 8:45 am]