[Federal Register: May 27, 2010 (Volume 75, Number 102)]
[Notices]
[Page 29754-29757]
[DOCID:fr27my10-52]

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ENVIRONMENTAL PROTECTION AGENCY

[EPA-HQ-OPPT-2010-0446; FRL-8827-3]

Claims of Confidentiality of Certain Chemical Identities
Contained in Health and Safety Studies and Data from Health and Safety
Studies Submitted Under the Toxic Substances Control Act

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice.

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SUMMARY: EPA will begin a general practice of reviewing confidentiality
claims for chemical identities in health and safety studies, and in
data from health and safety studies, submitted under the Toxic
Substances Control Act (TSCA) in accordance with Agency regulations at
40 CFR part 2, subpart B. Section 14(b) of TSCA does not extend
confidential treatment to health and safety studies, or data from
health and safety studies, which, if made public, would not disclose
processes used in the manufacturing or processing of a chemical
substance or mixture or, in the case of a mixture, the release of data
disclosing the portion of the mixture comprised by any of the chemical
substances in the mixture. Where a chemical identity does not
explicitly contain process information or reveal portions of a mixture,
EPA expects to find that the information would clearly not be entitled
to confidential treatment. This builds on similar efforts regarding
confidentiality of chemical identities listed on the public version of
the TSCA Chemical Substances Inventory (TSCA Inventory) and submitted
in notifications pursuant to TSCA section 8(e), discussed in the
Federal Register of January 21, 2010.

DATES: EPA expects to begin reviews of confidentiality claims -- both
newly submitted and existing claims -- in accordance with this guidance
on August 25, 2010. Though EPA is not required to solicit comment for
this action, comments received before this date will inform these
reviews.

ADDRESSES: Submit your comments, identified by docket identification
(ID) number EPA-HQ-OPPT-2010-0446, by one of the following methods:
      Federal eRulemaking Portal: http://www.regulations.gov.
Follow the on-line instructions for submitting comments.
      Mail: Document Control Office (7407M), Office of
Pollution Prevention and Toxics (OPPT), Environmental Protection
Agency, 1200 Pennsylvania Ave., NW., Washington, DC 20460-0001.
      Hand Delivery: OPPT Document Control Office (DCO), EPA
East Bldg., Rm. 6428, 1201 Constitution Ave., NW., Washington, DC.
Attention: Docket ID Number EPA-HQ-OPPT-2010-0446. The DCO is open from
8 a.m. to 4 p.m., Monday through Friday, excluding legal holidays. The
telephone number for the DCO is<PHONE_NUMBER>. Such deliveries are
only accepted during the DCO's normal hours of operation, and special
arrangements should be made for deliveries of boxed information.
    Instructions: Direct your comments to docket ID number EPA-HQ-OPPT-
2010-0446. EPA's policy is that all comments received will be included
in the docket without change and may be made available on-line at
http://www.regulations.gov, including any personal information
provided, unless the comment includes information claimed to be
Confidential Business Information (CBI) or other information whose
disclosure is restricted by statute. Do not submit information that you
consider to be CBI or otherwise protected through regulations.gov or e-
mail. The regulations.gov website is an ``anonymous access'' system,
which means EPA will not know your identity or contact information
unless you provide it in the body of your comment. If you send an e-
mail comment directly to EPA without going through regulations.gov,
your e-mail address will be automatically captured and included as part
of the comment that is placed in the docket and made available on the
Internet. If you submit an electronic comment, EPA recommends that you
include your name and other contact information in the body of your
comment and with any disk or CD-ROM you submit. 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. Electronic
files should avoid the use of special characters, any form of
encryption, and be free of any defects or viruses.
    Docket: All documents in the docket are listed in the docket index
available at http://www.regulations.gov. Although listed in the index,
some information is not publicly available, e.g., CBI or other
information whose disclosure is restricted by statute. Certain other
material, such as copyrighted material, will be publicly available only
in hard copy. Publicly available docket materials are available
electronically at

http://www.regulations.gov, or, if only available in hard copy, at the
OPPT Docket. The OPPT Docket is located in the EPA Docket Center (EPA/
DC) at Rm. 3334, EPA West Bldg., 1301 Constitution Ave., NW.,
Washington, DC. The EPA/DC Public Reading Room hours of operation are
8:30 a.m. to 4:30 p.m., Monday through Friday, excluding legal
holidays. The telephone number of the EPA/DC Public Reading Room is
(202) 566-1744, and the telephone number for the OPPT Docket is (202)
566-0280. Docket visitors are required to show photographic
identification, pass through a metal detector, and sign the EPA visitor
log. All visitor bags are processed through an X-ray machine and
subject to search. Visitors will be provided an EPA/DC badge that must
be visible at all times in the building and returned upon departure.

FOR FURTHER INFORMATION CONTACT: For technical information contact:
Scott M. Sherlock, Environmental Assistance Division, Office of
Pollution Prevention and Toxics, Environmental Protection Agency, 1200
Pennsylvania Ave., NW., Washington, DC 20460-0001; telephone number:
(202) 564-8257; e-mail address<EMAIL_ADDRESS>     For general information contact: The TSCA-Hotline, ABVI-Goodwill,
422 South Clinton Ave., Rochester, NY 14620; telephone number: (202)
554-1404; e-mail address<EMAIL_ADDRESS>
SUPPLEMENTARY INFORMATION:

I. General Information

A. Does this Action Apply to Me?

    This document is directed to the public in general, though it does
not directly impose any binding requirements on parties outside the
Agency. It may, however, be of particular interest to you if you
manufacture (defined by statute to include import) and/or process
chemical substances and mixtures subject to TSCA (15 U.S.C. 2601 et
seq.). You may be identified by the North American Industrial
Classification System (NAICS) codes 325 and 32411. Because this
document is directed to the general public and other entities may also
be interested, the Agency has not attempted to describe all the
specific entities that may be interested in this action. If you have
any questions regarding the applicability of this action to a
particular entity, consult the technical person listed under FOR
FURTHER INFORMATION CONTACT.

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

     1. Submitting CBI. Do not submit this information to EPA through
regulations.gov or e-mail. Clearly mark the part or all of the
information that you claim to be CBI. For CBI information in a disk or
CD-ROM that you mail to EPA, mark the outside of the disk or CD-ROM
that you mail to EPA, 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 claimed as CBI. In addition to one complete version
of the comment that includes 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. Information so marked
will not be disclosed except in accordance with procedures set forth in
40 CFR part 2.
     2. Tips for preparing your comments. When submitting comments,
remember to:
    i. Identify the document by docket ID number and other identifying
information (subject heading, Federal Register date and page number).
    ii. Follow directions. The Agency may ask you to respond to
specific questions or organize comments by referencing a Code of
Federal Regulations (CFR) part or section number.
    iii. Explain why you agree or disagree; suggest alternatives and
substitute language for your requested changes.
    iv. Describe any assumptions and provide any technical information
and/or data that you used.
    v. If you estimate potential costs or burdens, explain how you
arrived at your estimate in sufficient detail to allow for it to be
reproduced.
    vi. Provide specific examples to illustrate your concerns and
suggest alternatives.
    vii. Explain your views as clearly as possible, avoiding the use of
profanity or personal threats.
    viii. Make sure to submit your comments by the comment period
deadline identified.

II. What Action is the Agency Taking?

    The Agency expects to respond to certain confidentiality claims
regarding chemical identities in health and safety studies and in data
from health and safety studies with a determination letter under 40 CFR
2.306(d), 40 CFR 2.204(d)(2), and 40 CFR 2.205(f) that such information
is clearly not entitled to confidential treatment. This Federal
Register document only serves to announce an impending general Agency
practice, and this document does not constitute a final Agency action;
rather, any determination letter issued by EPA will constitute the
Agency's final determination that the chemical identity at issue is not
entitled to confidential treatment under TSCA section 14 (15 U.S.C.
2613), and the recipient of such a determination letter may seek
judicial review under 5 U.S.C. 701 et seq.
    At this time, EPA expects to issue these determination letters when
the chemical identity claimed as confidential:
    1. Was submitted as part of a health and safety study, or of data
from a health and safety study, submitted under TSCA that is subject to
TSCA section 14(b)(1).
     2. Does not explicitly contain process information.
     3. Does not reveal data disclosing the portion of the mixture
comprised by any of the chemical substances in the mixture.
    Each determination letter will provide a contact person within the
Agency whom the recipient of the letter can contact with any questions
or concerns about the determination related to the submission.
    The TSCA Inventory is a list of chemical substances subject to TSCA
that are in commerce in the United States, and the fact that a chemical
substance is on the TSCA Inventory may be claimed as confidential.
Release of a chemical identity under TSCA section 14(b) may
correspondingly affect the validity of a confidentiality claim for
presence on the TSCA Inventory. EPA expects to examine TSCA Inventory
confidentiality claims for chemical identity at the time it makes
determinations under TSCA section 14(b). EPA will issue determinations
on confidential inventory status when appropriate.
    This action is part of a broader effort to increase transparency
and provide more valuable information to the public by identifying data
collections where information may have been claimed and treated as
confidential in the past but is not in fact entitled to confidentiality
under TSCA. For such information, EPA is considering what actions might
be appropriate in accordance with its confidentiality regulations at 40
CFR part 2, subpart B. EPA believes these actions will make more health
and safety information available to the public and support an important
mission of the Agency to promote public understanding of the potential
risks posed by chemical substances in commerce.

III. What is the Agency's Authority for Taking this Action?

Under TSCA section 3(6) (15 U.S.C. 2602(6)):

    The term ``health and safety study'' means any study of any
effect of a chemical substance or mixture on health or the
environment or on both, including underlying data and
epidemiological studies, studies of occupational exposure to a
chemical substance or mixture, toxicological, clinical, and
ecological studies of a chemical substance or mixture, and any test
performed pursuant to this chapter.

    Health and safety studies may be submitted under various sections
of TSCA, such as TSCA section 8(d) rules explicitly requiring
submission of health and safety studies, notices of substantial risk
under TSCA section 8(e), and TSCA section 4 rules requiring persons to
perform testing. (15 U.S.C. 2603, 2607(d), and 2607(e)) Premanufacture
notices submitted under TSCA section 5 must include test data in the
possession or control of the person submitting the notice. (15 U.S.C.
2605(d)(1)(B)) Chemical identity is part of a health and safety study.
See, e.g., 40 CFR 716.3 and 40 CFR 720.3(k).
    Section 14(b)(1) of TSCA provides that health and safety studies
and data from health and safety studies are not entitled to
confidential treatment unless such information, if made public, would
disclose processes used in the manufacturing or processing of a
chemical substance or mixture or in the case of a mixture, the portion
of the mixture comprised by any of the chemical substances in the
mixture. (15 U.S.C. 2613(b)(1)) This document discusses the disclosure
of process information element only, and does not deal with the portion
of a mixture information element, which pertains to the concentrations
of the components of a mixture.
    Section 14(b)(1) of TSCA is limited to health and safety studies
and data submitted with respect to chemical substances or mixtures that
have been offered for commercial distribution and those for which
testing is required under TSCA section 4 or for which notification is
required under TSCA section 5.
    Until recently, EPA has not announced the Agency's views regarding
when disclosure of chemical identities may in turn disclose process
information. In the Federal Register issue of January 21, 2010 (75 FR
3462) (FRL-8807-9), EPA announced that ``[w]here a health and safety
study submitted under section 8(e) of TSCA involves a chemical identity
that is already listed on the public portion of the TSCA Chemical
Substances Inventory, EPA expects to find that the chemical identity
clearly is not entitled to confidential treatment.''
    In that January 21, 2010 Federal Register document the Agency
stated that:

``Where the identity of a chemical substance is already contained on
the public portion of the TSCA Chemical Substances Inventory, which
is publicly available from the National Technical Information
Service and other sources, EPA believes that the identity itself,
even assuming it might otherwise be CBI, as well as any information
that might be derived from it about processes or portions, has
already been disclosed.''
Id.

    The January 21, 2010 Federal Register document did not, however,
address chemical substances not on the public TSCA Inventory. With
respect to such chemical substances, EPA is aware that some companies
believe their competitors are sufficiently knowledgeable that if EPA
were to disclose the chemical identity, the competitors would be
capable of ascertaining on their own how the chemical substance might
be manufactured or processed, and therefore this would in effect
disclose process information.
    EPA, however, questions the assertion that when disclosing a
chemical identity of a chemical substance inspires a competitor to
ascertain a process for manufacturing the chemical substance, such
disclosure is equivalent to disclosing the process itself. Disclosing
the end product of a process (i.e., a chemical identity) is not the
same thing as disclosing the process to make that end product. The
process information would come from the competitor's expertise,
research, or publicly available sources, not from EPA. Although some
companies might find such use of a chemical identity undesirable, EPA
does not believe that TSCA section 14(b) was intended to limit the uses
of information from a health and safety study.
    Interpreting TSCA section 14(b)(1) otherwise might for all intents
and purposes exclude chemical identities in health and safety studies
from the disclosure provisions of TSCA section 14(b). Carried to its
logical conclusion, the argument that the manufacturing process for
chemical substances can be figured out by someone knowledgeable in the
area and for that reason disclosure of chemical identities is
considered equivalent to disclosing process information, would yield
the perverse result that chemical identities would rarely, if ever be
subject to TSCA section 14(b) disclosure.
     Chemical identify has been claimed as confidential in a
significant number of health and safety submissions. The result, in the
context of substantial risk notices under TSCA section 8(e) for
example, has been that the public is able to see that some unidentified
chemical substance might present a substantial risk of injury to health
or the environment. EPA believes that Congress generally intended for
the public to be able to know the identities of chemical substances for
which health and safety studies have been submitted. Congress did not
specifically exempt chemical identities from TSCA section 14(b), and
EPA believes that interpreting TSCA section 14(b) in such a manner
would be inconsistent with the intent of Congress in enacting the
provision.
    It is EPA's view that as a general matter disclosure of a chemical
identity does not disclose process information except where the
identity explicitly contains process information. For example, a name
such as ``formaldehyde'' (Chemical Abstracts Service (CAS) No. 50-00-0)
reveals nothing about the process to make the chemical substance, even
if any chemist could figure out independently that formaldehyde can be
generated by oxidizing methanol.
    In contrast, the names of some chemical substances -- especially
polymers and chemical substances of unknown or variable composition,
complex reaction products and biological materials (known as UVCB
substances) -- do explicitly contain process information. An
illustrative UVCB example is CAS No. 64742-28-5, specific chemical
substance's name ``Distillates (petroleum), chemically neutralized
light paraffinic.'' A polymer example is CAS No. 68474-52-2, safflower
oil, polymer with adipic acid, glycerol and phthalic anhydride. The
monomers adipic acid, glycerol and phthalic anhydride are reactants,
information pertaining to manufacture of the polymer. EPA expects that
such names would not be subject to TSCA section 14(b) disclosure in
those instances where the chemical substances' name were claimed as
confidential in a study.
    EPA intends to begin review of confidentiality claims for
identities of chemical substances in health and safety studies, and
data from health and safety studies, as described in this guidance, on
August 18, 2010. The Agency solicits comments prior to that date
regarding classes of chemical substances and attributes of chemical
identities that do or do not disclose process information. Such
comments will inform the Agency's reviews. Where process information in
the chemical identity is unnecessary to

characterize the chemical substance or mixture, EPA may release a
version of the chemical identity with the process information removed.
    EPA premanufacture notification regulations at 40 CFR 720.90(c)
state that EPA will deny a confidentiality claim for chemical identity
in a health and safety study submitted as part of a premanufacture
notice unless:
     1. The information in turn discloses process information,
     2. The information discloses portions of a mixture, or
     3. ``[t]he specific chemical identity is not necessary to
interpret a health and safety study'' (see also 40 CFR 725.92(c)
regarding microbial commercial activity notices). Consistent with the
intent of TSCA section 14(b) to allow broad public availability of
health and safety data, with limited exceptions, EPA intends to
interpret paragraph 3. narrowly.

IV. Why is EPA Taking this Action?

    Part of the Agency's mission is to promote public understanding of
potential risks by providing understandable, accessible, and complete
information on potential chemical risks to the broadest audience
possible. In support of this mission, EPA posts useful information
about chemical substances regulated under TSCA for the public on its
website (http://www.epa.gov/oppt/index.htm). One important source of
this information is health and safety studies submitted to the Agency.
The TSCA section 14(b) exclusion from confidential protection for
information from health and safety studies indicates the importance
attributed by Congress to making such information available to the
public. Chemical identities in particular constitute basic information
that helps the public to place risk information in context. Making
public chemical identities in health and safety studies whose
confidentiality is precluded by TSCA will support the Agency's mission.

List of Subjects

    Environmental protection, Chemicals, Confidential Business
Information, Health and safety, Reporting and recordkeeping.

    Dated: May 20, 2010.
Stephen A. Owens,
Assistant Administrator, Office of Chemical Safety and Pollution
Prevention.

[FR Doc. 2010-12646 Filed 5-26-10; 8:45 am]
BILLING CODE 6560-50-S


	UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

	WASHINGTON, D.C.  20460

OFFICE OF PREVENTION, PESTICIDES AND TOXIC SUBSTANCES

May 31, 2005							DP Barcode: 317705

PC Code: 029801, 029806, 129043

MEMORANDUM

SUBJECT: Drinking water assessment for Dicamba on sugarcane.

TO:		Susan Lewis, Branch Chief

Kendra Tyler, CRM

Special Review and Reregistration Division   (7508C)

FROM:	Ibrahim Abdel-Saheb, Environmental Scientist

Environmental Risk Branch II

Environmental Fate and Effects Division

THRU:	Dana Spatz, Senior Chemist

Environmental Risk Branch II

Environmental Fate and Effects Division

Tom Bailey, Branch Chief

Environmental Risk Branch II

Environmental Fate and Effects Division

CONCLUSIONS

This drinking water assessment is for the herbicide active ingredient Dicamba (Chemical Name: 3,6-Dichloro-o-anisic acid), and its degradate dichlorosalicylic acid (DCSA).  Dicamba acid is formed by the dissociation of the following dicamba salts: dimethylamine, sodium, diglycolamine, isopropylamine, and potassium.  Results from an acceptable dissociation rate study (MRID# 43288001) showed that dicamba salts reach essentially 100% dissociation within 75 seconds of the time of mixing with pure water.  Thus, this water memo reflects the exposure EECs resulting from the use of any of the dicamba salt formulations.

 ADVANCE \d4 Dicamba is a benzoic acid herbicide.  It can be applied to the leaves or to the soil. Dicamba controls annual and perennial broadleaf weeds in grain crops and grasslands, and it is used to control brush and bracken in pastures.  In combination with a phenoxyalkanoic acid or other herbicide, dicamba is used in pastures, range land, and non-crop areas such as fence-rows and roadways to control weeds.  Dicamba is absorbed by leaves and roots, and moves throughout the plant.  In some plants, it may accumulate in the tips of leaves.  Dicamba acts as a growth regulator.  Some plants can metabolize or break down dicamba.

The Tier II screening models PRZM1 and EXAMS2 with the Index Reservoir and Percent Crop Area adjustment (IR-PCA PRZM/EXAMS) were used to determine estimated surface water concentrations of Dicamba acid and its degradate DCSA.

Based on PRZM/EXAMS modeling, the surface water Expected Environmental Concentrations (EEC) of  Dicamba acid and its degradate DCSA for the use on sugarcane are shown in table 1.

Table 1. Estimated drinking water concentrations to be used for exposure to Dicamba acid,  and its degradate dichlorosalicylic acid (DCSA) in drinking water derived from Surface Water.

Crop

Model EECs  (μg/L)

              Dicamba

DCSA

use(s) modeled

PCA

Acute

One-in-10-year annual mean

36 year overall mean

Acute

One-in-10-year annual mean

36 year overall mean

One application @ 2.8 lbai/A (parent); and 0.446 lbai/A (DCSA)

0.87

FL-Sugarcane (Ground)

357

13.0

5.23

10.1

0.75

0.40

FL-Sugarcane (Aerial)

346

12.9

5.38

10.9

8.13

0.47

LA-Sugarcane (Ground)

233

9.74

3.13

8.79

0.66

0.32

LA-Sugarcane (Aerial)

230

9.74

3.44

9.74

0.73

0.39

Ground Water

0.016

0.008

Environmental Fate Assessment:

Aerobic soil metabolism is the main degradative process for dicamba.  A single observed half-life for dicamba was six days, with formation of the intermediate non-persistent degradate DCSA.  DCSA degraded at roughly the same rate as dicamba; the final metabolites were carbon dioxide and microbial biomass. Dicamba is stable to abiotic hydrolysis at all pH's and photodegrades slowly in water and on soil.  Dicamba is more persistent under anaerobic soil:water systems in the laboratory, with a half-life of 141 days.  The major degradate under anaerobic conditions was DCSA, which was persistent, comprising > 60% of the applied after 365 days of anaerobic incubation.  No other anaerobic degradates were present at > 10% during the incubation.   There are no acceptable data for the aerobic aquatic metabolism of dicamba; supplemental information indicates that dicamba degrades more rapidly in aquatic systems when sediment is present.

Dicamba is very soluble (6100 ppm) and very mobile (Koc = 13.4) in the laboratory.  Because dicamba is not persistent under aerobic conditions, very little dicamba could be expected to leach to groundwater.  If any dicamba did reach anaerobic ground water, it would be somewhat persistent (due to its anaerobic half-life of 141 days); any DCSA that reached ground water would be expected to persist.  Results from two acceptable field dissipation studies conducted with dimethylamine salt of dicamba, indicated that dicamba dissipated with a half-life range of 4.4 to 19.8 days.  The DCSA was the major degradate in both studies. Both, dicamba and its degradate (DCSA) were found in soil segments deeper than 10 cm.

Dicamba is not expected to bioaccumulate in aquatic organisms because it is an anion at environmental pHs (pKa = 1.9).

Monitoring data

Monitoring data were not used to refine this Tier I assessment.  However, monitoring data are available in the Pesticides in Ground Water Database [Hoheisel et al. 1991] for dicamba (3,172 wells sampled) and 5-hydroxy dicamba (87 wells sampled). Out of the wells sampled, there were no reports of residues greater than the stated MCL (200 µg/L lifetime).  However, the detection limits are unknown, and it is not known if wells were sampled in areas where dicamba was used.  STORET contains records for sampling for dicamba in samples from lakes, ocean, estuary, canal, or reservoir sites.  The data have not been extensively evaluated; in addition, it is uncertain what the actual detection limits were for the samples and whether samples were taken from areas where dicamba was not in use.  The US Geological Survey National Water Quality Assessment program (NAWQA) is not currently analyzing for dicamba in their samples, and they do not have analytical methods for this chemical in place.

SURFACE WATER

PRZM-EXAMS simulations were conducted for Dicamba acid and its degradate DCSA use on sugarcane to evaluate the cumulative probability distribution for peak and annual mean EECs. Selective PRZM/EXAMS modeling inputs are shown in Tables 2 and 3. The input and output files for these runs are in Appendix I.

Table 2. Surface Water Exposure Inputs for PRZM/EXAMS for Dicamba acid.

Input variable (Units)

Input value & calculations

Source

Crop name

sugarcane

EPA Reg. No. 7969-140

application rate (lb ai/acre)

2.8

EPA Reg. No. 7969-140

Interval between appl. (d)

N/A

EPA Reg. No. 7969-140

Application efficiency

0.95 (aerial); 0.99 (ground)

Input parameters guideline (2/28/2002).

Spray drift fraction

0.16 (aerial); 0.064 (ground)

Input parameters guideline (2/28/2002).

DWRATE (day-1)

0.038 (6 d x 3)

MRID # 43245207; Input parameters guideline (2/28/2002).

DSRATE (day-1)

0.038

MRID # 43245207; Input parameters guideline (2/28/2002).

Koc (mL/g)

13.4 (average)

MRID# 42774101; Input parameters guideline (2/28/2002).

Henry's Law Const. (atm.m3/mole)

1.6X10-9

calculated

KBACW (h-1)

0.058 (6X2=12 d)

No data; aerobic soil metabolism half-life rate X 0.5; Input parameters guideline (2/28/2002).

KBACS (h-1)

0.0016 (141X3=423 d)

MRID# 43245208; Input parameters guideline (2/28/2002).

KDP (h-1)

0.00076 (914.4)

MRID# 42774102; Input parameters guideline (2/28/2002).

KBH, KNH, KAH (h-1)

stable

MRID# 40547902; Input parameters guideline (2/28/2002).

KPS (mL/g)

13.4 (average)

MRID# 42774101; Input parameters guideline (2/28/2002).

MWT (g/mole)

221

SANDOZE Safety Data Sheet (Nov, 1989).

Solubility @ 25 0C (mg/L)

6100

SANDOZE Safety Data Sheet (Nov, 1989).

Vapor pressure (torr)

3.41X10-5

SANDOZE Safety Data Sheet (Nov, 1989).

Table 3. Surface Water Exposure Inputs for PRZM/EXAMS for DCSA.

Input variable (Units)

Input value & calculations

Source

Crop name

sugarcane

EPA Reg. No. 7969-140

application rate (lb ai/acre)

0.446*

EPA Reg. No. 7969-140

Interval between appl. (d)

N/A

EPA Reg. No. 7969-140

Application efficiency

0.95 (aerial); 0.99 (ground)

Input parameters guideline (2/28/2002).

Spray drift fraction

0.16 (aerial); 0.064 (ground)

Input parameters guideline (2/28/2002).

DWRATE (day-1)

0.0282 (8.2 d x3)

MRID # 43245207; Input parameters guideline (2/28/2002).

DSRATE (day-1)

0.0282 (8.2 d x3)

MRID # 43245207; Input parameters guideline (2/28/2002).

Koc (mL/g)

1208 (average)

MRID# 43095301; Input parameters guideline (2/28/2002).

Henry's Law Const. (atm.m3/mole)

1.6X10-9

calculated for dicamba

KBACW (h-1)

0.058 (8.2X2=16.4 d)

No data; aerobic soil metabolism half-life rate X 0.5; Input parameters guideline (2/28/2002).

KBACS (h-1)

stable

MRID# 43245208; Input parameters guideline (2/28/2002).

KDP (h-1)

0.00076 (914.4)

For dicamba; MRID# 42774102; Input parameters guideline (2/28/2002).

KBH, KNH, KAH (h-1)

stable

For dicamba; MRID# 40547902; Input parameters guideline (2/28/2002).

KPS (mL/g)

1208 (average)

MRID# 43095301; Input parameters guideline (2/28/2002).

MWT (g/mole)

207

Product Chemistry Info.

Solubility @ 25 0C (mg/L)

2112

MRID# 43095301

Vapor pressure (torr)

3.41X10-5

For dicamba; SANDOZE Safety Data Sheet (Nov, 1989).

GROUND WATER

The SCI-GROW model is based on scaled ground water concentration from ground water monitoring studies, environmental fate properties (aerobic soil half-lives and organic carbon partitioning coefficients-Koc 's) and application rates. The model is based on permeable soils that are vulnerable to leaching and on shallow ground water (10-30 feet). SCI-GROW version 2.3 (executable file dated 08/05/2003) was used to estimate concentrations of Dicamba acid,  and its degradate dichlorosalicylic acid (DCSA) that could be found in drinking water derived from ground water, using the input values listed in the tables 4 and 5.

Table 4. Ground Water Exposure Inputs for SCI-GROW for  Dicamba acid.

MODEL INPUT VARIABLE

INPUT VALUE

COMMENTS

Application Rate

(lbs. ai/A)

2.8

EPA Reg. No. 7969-140

Maximum No. of

Applications

1

EPA Reg. No. 7969-140

Koc (mL/g)

3.45

Lowest value; MRID# 42774101; Input guideline2, 2002.

Aerobic Soil

Metabolic Half-life

(days)

6

MRID MRID # 43245207; Input guideline2, 2002.

Table 5. Ground Water Exposure Inputs for SCI-GROW for  DCSA.

MODEL INPUT VARIABLE

INPUT VALUE

COMMENTS

Application Rate

(lbs. ai/A)

0.446

EPA Reg. No. 7969-140

Maximum No. of

Applications

1

EPA Reg. No. 7969-140

Koc (mL/g)

242.4

Lowest value; MRID# 43095301; Input guideline2, 2002.

Aerobic Soil

Metabolic Half-life

(days)

8.2

MRID MRID # 43245207; Input guideline2, 2002.

Results from the SCI-GROW screening model predict that the maximum chronic and acute concentration of parent Dicamba acid,  and its degradates the dichlorosalicylic acid (DCSA) in shallow ground water is not expected to exceed 0.016 µg/L, and 0.0081µg/L, respectively, for the current maximum seasonal use rate on sugarcane.

APPENDIX I

IR-PCA PRZM/EXAMS INPUT & OUTPUT FILES

DICAMBA

FL-Sugarcane (Ground)

stored	as	DicaFLGr.out

Chemical:	dicamba

	PRZM	environment:	FLsugarcaneC.txt	modified	Satday,	12	October

EXAMS	environment:	ir298.exv	modified	Thuday,	29	August

Metfile:	w12844.dvf	modified	Wedday,	3	July	2002

Water	segment	concentrations	(ppb)

	Year	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

1961	9.964	8.696	6.909	5.306	3.801	0.943

1962	87.71	75.51	45.4	21.47	14.8	3.664

1963	490	427	246	106	71.57	17.7

1964	89.42	77.5	47.63	24.72	16.79	4.143

1965	20.89	17.95	10.75	7.108	5.768	1.451

1966	9.576	8.448	5.791	4.438	3.249	0.8084

1967	39.41	33.75	24	10.68	7.983	2.04

1968	34.53	30.81	22.7	12.46	8.648	2.137

1969	249	226	131	56.09	38.38	9.496

1970	153	134	76.58	32.17	22.31	5.576

1971	90.64	78	51.97	27.52	19.29	4.781

1972	390	339	208	90.06	60.62	14.93

1973	69.17	59.06	33.84	15.6	10.96	2.72

1974	21.67	19.13	12.59	6.741	4.958	1.235

1975	12.59	11.75	8.947	5.771	4.11	1.021

1976	64.42	58.27	42.85	20.12	13.88	3.426

1977	301	260	151	67.27	46.02	11.39

1978	49.28	42.92	34.64	17.17	11.69	2.894

1979	395	344	202	89.16	60.4	14.93

1980	126	111	67.87	33.68	22.87	5.641

1981	37.37	31.96	24.49	14.13	10.09	2.504

1982	307	266	160	70.13	47.44	11.72

1983	9.783	8.575	5.729	4.73	3.511	0.875

1984	139	120	71.76	30.67	21.4	5.337

1985	157	137	83.94	41.26	27.85	6.883

1986	26.61	22.85	13.95	9.008	7.043	1.771

1987	99.88	85.67	60.66	27.55	19.08	4.723

1988	412	358	207	89.3	60.6	14.95

1989	511	449	266	114	76.47	18.89

1990	35.28	30.72	19.69	10.94	7.553	1.872

Sorted	results

	Prob.	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

0.032258	511	449	266	114	76.47	18.89

0.064516	490	427	246	106	71.57	17.7

0.096774	412	358	208	90.06	60.62	14.95

0.129032	395	344	207	89.3	60.6	14.93

0.16129	390	339	202	89.16	60.4	14.93

0.193548	307	266	160	70.13	47.44	11.72

0.225806	301	260	151	67.27	46.02	11.39

0.258065	249	226	131	56.09	38.38	9.496

0.290323	157	137	83.94	41.26	27.85	6.883

0.322581	153	134	76.58	33.68	22.87	5.641

0.354839	139	120	71.76	32.17	22.31	5.576

0.387097	126	111	67.87	30.67	21.4	5.337

0.419355	99.88	85.67	60.66	27.55	19.29	4.781

0.451613	90.64	78	51.97	27.52	19.08	4.723

0.483871	89.42	77.5	47.63	24.72	16.79	4.143

0.516129	87.71	75.51	45.4	21.47	14.8	3.664

0.548387	69.17	59.06	42.85	20.12	13.88	3.426

0.580645	64.42	58.27	34.64	17.17	11.69	2.894

0.612903	49.28	42.92	33.84	15.6	10.96	2.72

0.645161	39.41	33.75	24.49	14.13	10.09	2.504

0.677419	37.37	31.96	24	12.46	8.648	2.137

0.709677	35.28	30.81	22.7	10.94	7.983	2.04

0.741935	34.53	30.72	19.69	10.68	7.553	1.872

0.774194	26.61	22.85	13.95	9.008	7.043	1.771

0.806452	21.67	19.13	12.59	7.108	5.768	1.451

0.83871	20.89	17.95	10.75	6.741	4.958	1.235

0.870968	12.59	11.75	8.947	5.771	4.11	1.021

0.903226	9.964	8.696	6.909	5.306	3.801	0.943

0.935484	9.783	8.575	5.791	4.73	3.511	0.875

0.967742	9.576	8.448	5.729	4.438	3.249	0.8084

0.1	410.3	356.6	207.9	89.984	60.618	14.948

	Average	of	yearly	averages:	6.015047

	Inputs	generated	by	pe4.pl	-	8-Aug-03

	Data	used	for	this	run:

Output	File:	DicaFLGr

Metfile:	w12844.dvf

	PRZM	scenario:	FLsugarcaneC.txt

EXAMS	environment	file:	ir298.exv

	Chemical	Name:	dicamba

Description	Variable	Name	Value	Units	Comments

	Molecular	weight	mwt	221.04	g/mol

Henry's	Law	Const.	henry	1.60E-09	atm-m^3/mol

Vapor	Pressure	vapr	3.41E-05	torr

Solubility	sol	6100	mg/L

	Kd	Kd	mg/L

Koc	Koc	13.4	mg/L

	Photolysis	half-life	kdp	38.1	days	Half-life

	Aerobic	Aquatic	Metabolism	kbacw	12	days	Halfife

Anaerobic	Aquatic	Metabolism	kbacs	423	days	Halfife

Aerobic	Soil	Metabolism	asm	18	days	Halfife

Hydrolysis:	pH	7	0	days	Half-life

	Method:	CAM	2	integer	See	PRZM	manual

Incorporation	Depth:	DEPI	0	cm

Application	Rate:	TAPP	3.14	kg/ha

Application	Efficiency:	APPEFF	0.99	fraction

Spray	Drift	DRFT	0.064	fraction	of	application

Application	Date	Date	15-04	dd/mm	or	dd/mmm

Record	17:00	FILTRA

	IPSCND	1

	UPTKF

	Record	18:00	PLVKRT

	PLDKRT

FEXTRC	0.5

Flag	for	Index	Res.	Run	IR	IR

Flag	for	runoff	calc.	RUNOFF	total	none,

FL-Sugarcane (Aerial)

stored	as	DicaFLAr.out

Chemical:	dicamba

	PRZM	environment:	FLsugarcaneC.txt	modified	Satday,	12	October

EXAMS	environment:	ir298.exv	modified	Thuday,	29	August

Metfile:	w12844.dvf	modified	Wedday,	3	July	2002

Water	segment	concentrations	(ppb)

	Year	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

1961	18.33	15.8	10.04	7.651	5.367	1.329

1962	86.93	74.83	45.05	23.21	15.96	3.949

1963	473	413	238	103	70.4	17.41

1964	89.79	77.81	48.41	26.21	17.78	4.387

1965	21.41	18.4	10.99	9.053	7.211	1.806

1966	18.34	16.04	10.64	6.861	4.867	1.208

1967	38.03	32.57	23.15	10.3	9.375	2.381

1968	34.93	31.24	23.2	14.51	10.01	2.473

1969	242	219	127	56.16	38.53	9.531

1970	147	130	73.76	30.99	23.04	5.754

1971	88.21	75.9	51.57	29.01	20.27	5.022

1972	382	333	204	88.97	59.88	14.75

1973	68.21	58.24	33.35	17.45	12.18	3.021

1974	21.95	19.43	12.7	8.979	6.444	1.601

1975	18.34	15.94	9.747	8.066	5.644	1.4

1976	65.29	59.14	42.97	21.92	15.07	3.72

1977	291	251	146	66.55	45.85	11.35

1978	53.23	46.41	36.27	19	12.92	3.196

1979	385	335	197	88.07	59.68	14.75

1980	130	114	69.71	34.97	23.73	5.851

1981	37.99	32.5	24.53	16.02	11.34	2.81

1982	300	260	157	69.78	47.19	11.66

1983	19.95	17.44	11.46	7.139	5.117	1.271

1984	134	115	69.24	29.6	22.32	5.561

1985	162	142	86.46	42.16	28.46	7.032

1986	26.92	23.12	14.07	10.57	8.531	2.137

1987	98.43	84.42	59.47	29.18	20.15	4.987

1988	399	346	200	87.66	59.86	14.76

1989	502	441	261	112	75.06	18.54

1990	39.81	34.66	21.89	13.02	8.935	2.213

Sorted	results

	Prob.	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

0.032258	502	441	261	112	75.06	18.54

0.064516	473	413	238	103	70.4	17.41

0.096774	399	346	204	88.97	59.88	14.76

0.129032	385	335	200	88.07	59.86	14.75

0.16129	382	333	197	87.66	59.68	14.75

0.193548	300	260	157	69.78	47.19	11.66

0.225806	291	251	146	66.55	45.85	11.35

0.258065	242	219	127	56.16	38.53	9.531

0.290323	162	142	86.46	42.16	28.46	7.032

0.322581	147	130	73.76	34.97	23.73	5.851

0.354839	134	115	69.71	30.99	23.04	5.754

0.387097	130	114	69.24	29.6	22.32	5.561

0.419355	98.43	84.42	59.47	29.18	20.27	5.022

0.451613	89.79	77.81	51.57	29.01	20.15	4.987

0.483871	88.21	75.9	48.41	26.21	17.78	4.387

0.516129	86.93	74.83	45.05	23.21	15.96	3.949

0.548387	68.21	59.14	42.97	21.92	15.07	3.72

0.580645	65.29	58.24	36.27	19	12.92	3.196

0.612903	53.23	46.41	33.35	17.45	12.18	3.021

0.645161	39.81	34.66	24.53	16.02	11.34	2.81

0.677419	38.03	32.57	23.2	14.51	10.01	2.473

0.709677	37.99	32.5	23.15	13.02	9.375	2.381

0.741935	34.93	31.24	21.89	10.57	8.935	2.213

0.774194	26.92	23.12	14.07	10.3	8.531	2.137

0.806452	21.95	19.43	12.7	9.053	7.211	1.806

0.83871	21.41	18.4	11.46	8.979	6.444	1.601

0.870968	19.95	17.44	10.99	8.066	5.644	1.4

0.903226	18.34	16.04	10.64	7.651	5.367	1.329

0.935484	18.34	15.94	10.04	7.139	5.117	1.271

0.967742	18.33	15.8	9.747	6.861	4.867	1.208

0.1	397.6	344.9	203.6	88.88	59.878	14.759

	Average	of	yearly	averages:	6.195333

	Inputs	generated	by	pe4.pl	-	8-Aug-03

	Data	used	for	this	run:

Output	File:	DicaFLAr

Metfile:	w12844.dvf

	PRZM	scenario:	FLsugarcaneC.txt

EXAMS	environment	file:	ir298.exv

	Chemical	Name:	dicamba

Description	Variable	Name	Value	Units	Comments

	Molecular	weight	mwt	221.04	g/mol

Henry's	Law	Const.	henry	1.60E-09	atm-m^3/mol

Vapor	Pressure	vapr	3.41E-05	torr

Solubility	sol	6100	mg/L

	Kd	Kd	mg/L

Koc	Koc	13.4	mg/L

	Photolysis	half-life	kdp	38.1	days	Half-life

	Aerobic	Aquatic	Metabolism	kbacw	12	days	Halfife

Anaerobic	Aquatic	Metabolism	kbacs	423	days	Halfife

Aerobic	Soil	Metabolism	asm	18	days	Halfife

Hydrolysis:	pH	7	0	days	Half-life

	Method:	CAM	2	integer	See	PRZM	manual

Incorporation	Depth:	DEPI	0	cm

Application	Rate:	TAPP	3.14	kg/ha

Application	Efficiency:	APPEFF	0.95	fraction

Spray	Drift	DRFT	0.16	fraction	of	application

Application	Date	Date	15-04	dd/mm	or	dd/mmm

Record	17:00	FILTRA

	IPSCND	1

	UPTKF

	Record	18:00	PLVKRT

	PLDKRT

FEXTRC	0.5

Flag	for	Index	Res.	Run	IR	IR

Flag	for	runoff	calc.	RUNOFF	total	none,

LA-Sugarcane (Ground)

stored	as	DicaLAgr.out

Chemical:	dicamba

	PRZM	environment:	LAsugarcaneC.txt	modified	Satday,	12	October

EXAMS	environment:	ir298.exv	modified	Thuday,	29	August

Metfile:	w13970.dvf	modified	Wedday,	3	July	2002

Water	segment	concentrations	(ppb)

	Year	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

1961	126	111	75.6	35.68	24.59	6.098

1962	280	254	154	68.29	46.64	11.54

1963	7.339	6.47	4.387	2.152	1.459	0.3649

1964	28.67	25.42	20.75	10.25	6.939	1.711

1965	64.03	56.64	35.34	16.39	11.1	2.746

1966	163	145	97.6	46.11	31.27	7.733

1967	59.42	52.24	36.16	19.41	13.17	3.259

1968	11.07	9.798	6.269	3.793	2.582	0.6382

1969	14.86	13.26	9.358	5.353	3.634	0.8987

1970	127	113	73.27	35.87	24.28	6.003

1971	10.61	9.571	5.986	4.157	2.903	0.7218

1972	22.58	19.72	12.25	7.334	5.06	1.25

1973	342	313	212	98.02	66.21	16.36

1974	38.95	34.73	22.72	11	7.443	1.845

1975	55.59	49.14	30.31	14.55	9.987	2.474

1976	31.13	27.59	17.56	9.345	6.621	1.641

1977	92.03	82.21	54.58	25.29	17.08	4.223

1978	88.5	76.73	54.45	24.73	17.04	4.22

1979	344	314	205	94.67	64.27	15.9

1980	46.46	41.66	31.82	15.53	10.5	2.595

1981	12.45	10.99	8.261	4.293	2.908	0.7198

1982	33.3	30.09	20.22	9.737	6.571	1.624

1983	54.43	49.28	32.33	16.54	11.35	2.812

1984	14.03	12.28	8.154	5.122	3.593	0.8903

1985	7.334	6.537	4.35	2.661	1.818	0.4501

1986	78.9	70.31	44.45	20.81	14.09	3.482

1987	17.11	14.87	8.895	5.306	3.705	0.9197

1988	38.27	34.17	22.49	10.73	7.267	1.792

1989	56.18	49.03	29.01	13.69	9.465	2.345

1990	15.63	13.98	9.067	5.107	3.466	0.8577

Sorted	results

	Prob.	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

0.032258	344	314	212	98.02	66.21	16.36

0.064516	342	313	205	94.67	64.27	15.9

0.096774	280	254	154	68.29	46.64	11.54

0.129032	163	145	97.6	46.11	31.27	7.733

0.16129	127	113	75.6	35.87	24.59	6.098

0.193548	126	111	73.27	35.68	24.28	6.003

0.225806	92.03	82.21	54.58	25.29	17.08	4.223

0.258065	88.5	76.73	54.45	24.73	17.04	4.22

0.290323	78.9	70.31	44.45	20.81	14.09	3.482

0.322581	64.03	56.64	36.16	19.41	13.17	3.259

0.354839	59.42	52.24	35.34	16.54	11.35	2.812

0.387097	56.18	49.28	32.33	16.39	11.1	2.746

0.419355	55.59	49.14	31.82	15.53	10.5	2.595

0.451613	54.43	49.03	30.31	14.55	9.987	2.474

0.483871	46.46	41.66	29.01	13.69	9.465	2.345

0.516129	38.95	34.73	22.72	11	7.443	1.845

0.548387	38.27	34.17	22.49	10.73	7.267	1.792

0.580645	33.3	30.09	20.75	10.25	6.939	1.711

0.612903	31.13	27.59	20.22	9.737	6.621	1.641

0.645161	28.67	25.42	17.56	9.345	6.571	1.624

0.677419	22.58	19.72	12.25	7.334	5.06	1.25

0.709677	17.11	14.87	9.358	5.353	3.705	0.9197

0.741935	15.63	13.98	9.067	5.306	3.634	0.8987

0.774194	14.86	13.26	8.895	5.122	3.593	0.8903

0.806452	14.03	12.28	8.261	5.107	3.466	0.8577

0.83871	12.45	10.99	8.154	4.293	2.908	0.7218

0.870968	11.07	9.798	6.269	4.157	2.903	0.7198

0.903226	10.61	9.571	5.986	3.793	2.582	0.6382

0.935484	7.339	6.537	4.387	2.661	1.818	0.4501

0.967742	7.334	6.47	4.35	2.152	1.459	0.3649

0.1	268.3	243.1	148.36	66.072	45.103	11.1593

	Average	of	yearly	averages:	3.603807

	Inputs	generated	by	pe4.pl	-	8-Aug-03

	Data	used	for	this	run:

Output	File:	DicaLAgr

Metfile:	w13970.dvf

	PRZM	scenario:	LAsugarcaneC.txt

EXAMS	environment	file:	ir298.exv

	Chemical	Name:	dicamba

Description	Variable	Name	Value	Units	Comments

	Molecular	weight	mwt	221.04	g/mol

Henry's	Law	Const.	henry	1.60E-09	atm-m^3/mol

Vapor	Pressure	vapr	3.41E-05	torr

Solubility	sol	6100	mg/L

	Kd	Kd	mg/L

Koc	Koc	13.4	mg/L

	Photolysis	half-life	kdp	38.1	days	Half-life

	Aerobic	Aquatic	Metabolism	kbacw	12	days	Halfife

Anaerobic	Aquatic	Metabolism	kbacs	423	days	Halfife

Aerobic	Soil	Metabolism	asm	18	days	Halfife

Hydrolysis:	pH	7	0	days	Half-life

	Method:	CAM	2	integer	See	PRZM	manual

Incorporation	Depth:	DEPI	0	cm

Application	Rate:	TAPP	3.14	kg/ha

Application	Efficiency:	APPEFF	0.99	fraction

Spray	Drift	DRFT	0.064	fraction	of	application

Application	Date	Date	15-04	dd/mm	or	dd/mmm

Record	17:00	FILTRA

	IPSCND	1

	UPTKF

	Record	18:00	PLVKRT

	PLDKRT

FEXTRC	0.5

Flag	for	Index	Res.	Run	IR	IR

Flag	for	runoff	calc.	RUNOFF	total	none,

LA-Sugarcane (Aerial)

stored	as	DicaLAAr.out

Chemical:	dicamba

	PRZM	environment:	LAsugarcaneC.txt	modified	Satday,	12	October

EXAMS	environment:	ir298.exv	modified	Thuday,	29	August

Metfile:	w13970.dvf	modified	Wedday,	3	July	2002

Water	segment	concentrations	(ppb)

	Year	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

1961	127	115	78.11	38.31	26.37	6.537

1962	275	249	151	68.46	46.82	11.59

1963	18.34	16.17	10.38	4.824	3.258	0.8095

1964	36.65	32.49	25.27	12.69	8.586	2.117

1965	70.22	62.12	38.76	18.58	12.58	3.11

1966	164	147	99.13	47.26	32.04	7.923

1967	68.31	60.06	40.81	21.4	14.51	3.592

1968	18.34	16.29	12.4	6.557	4.446	1.098

1969	20.57	18.61	15.4	8.122	5.499	1.36

1970	133	118	76.61	37.32	25.25	6.244

1971	18.34	16.45	10.8	7.099	4.887	1.212

1972	24.49	21.38	14.34	9.937	6.809	1.681

1973	338	310	210	97.16	65.62	16.22

1974	48.68	43.4	28.27	13.47	9.11	2.257

1975	58.29	51.53	31.91	17.03	11.66	2.886

1976	32.4	28.71	18.55	12.03	8.426	2.086

1977	96.31	86.15	57.28	27.24	18.39	4.546

1978	88.78	76.98	54.21	26.67	18.32	4.538

1979	337	309	201	93.71	63.71	15.76

1980	51.06	45.79	36.09	17.92	12.11	2.991

1981	18.84	17.58	14.15	6.987	4.725	1.169

1982	39.95	36.02	25.43	12.3	8.292	2.049

1983	60.16	54.47	35.73	19.13	13.1	3.243

1984	18.34	16.37	10.58	7.913	5.473	1.354

1985	18.34	16.34	10.64	5.514	3.742	0.9257

1986	84.13	74.98	47.4	22.9	15.49	3.829

1987	18.87	16.46	10.81	8.13	5.605	1.389

1988	46.22	41.26	27.31	13.29	8.995	2.218

1989	57.55	50.21	29.7	16.11	11.09	2.745

1990	20.69	18.51	14.4	7.868	5.322	1.316

Sorted	results

	Prob.	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

0.032258	338	310	210	97.16	65.62	16.22

0.064516	337	309	201	93.71	63.71	15.76

0.096774	275	249	151	68.46	46.82	11.59

0.129032	164	147	99.13	47.26	32.04	7.923

0.16129	133	118	78.11	38.31	26.37	6.537

0.193548	127	115	76.61	37.32	25.25	6.244

0.225806	96.31	86.15	57.28	27.24	18.39	4.546

0.258065	88.78	76.98	54.21	26.67	18.32	4.538

0.290323	84.13	74.98	47.4	22.9	15.49	3.829

0.322581	70.22	62.12	40.81	21.4	14.51	3.592

0.354839	68.31	60.06	38.76	19.13	13.1	3.243

0.387097	60.16	54.47	36.09	18.58	12.58	3.11

0.419355	58.29	51.53	35.73	17.92	12.11	2.991

0.451613	57.55	50.21	31.91	17.03	11.66	2.886

0.483871	51.06	45.79	29.7	16.11	11.09	2.745

0.516129	48.68	43.4	28.27	13.47	9.11	2.257

0.548387	46.22	41.26	27.31	13.29	8.995	2.218

0.580645	39.95	36.02	25.43	12.69	8.586	2.117

0.612903	36.65	32.49	25.27	12.3	8.426	2.086

0.645161	32.4	28.71	18.55	12.03	8.292	2.049

0.677419	24.49	21.38	15.4	9.937	6.809	1.681

0.709677	20.69	18.61	14.4	8.13	5.605	1.389

0.741935	20.57	18.51	14.34	8.122	5.499	1.36

0.774194	18.87	17.58	14.15	7.913	5.473	1.354

0.806452	18.84	16.46	12.4	7.868	5.322	1.316

0.83871	18.34	16.45	10.81	7.099	4.887	1.212

0.870968	18.34	16.37	10.8	6.987	4.725	1.169

0.903226	18.34	16.34	10.64	6.557	4.446	1.098

0.935484	18.34	16.29	10.58	5.514	3.742	0.9257

0.967742	18.34	16.17	10.38	4.824	3.258	0.8095

0.1	263.9	238.8	145.813	66.34	45.342	11.2233

	Average	of	yearly	averages:	3.95984

	Inputs	generated	by	pe4.pl	-	8-Aug-03

	Data	used	for	this	run:

Output	File:	DicaLAAr

Metfile:	w13970.dvf

	PRZM	scenario:	LAsugarcaneC.txt

EXAMS	environment	file:	ir298.exv

	Chemical	Name:	dicamba

Description	Variable	Name	Value	Units	Comments

	Molecular	weight	mwt	221.04	g/mol

Henry's	Law	Const.	henry	1.60E-09	atm-m^3/mol

Vapor	Pressure	vapr	3.41E-05	torr

Solubility	sol	6100	mg/L

	Kd	Kd	mg/L

Koc	Koc	13.4	mg/L

	Photolysis	half-life	kdp	38.1	days	Half-life

	Aerobic	Aquatic	Metabolism	kbacw	12	days	Halfife

Anaerobic	Aquatic	Metabolism	kbacs	423	days	Halfife

Aerobic	Soil	Metabolism	asm	18	days	Halfife

Hydrolysis:	pH	7	0	days	Half-life

	Method:	CAM	2	integer	See	PRZM	manual

Incorporation	Depth:	DEPI	0	cm

Application	Rate:	TAPP	3.14	kg/ha

Application	Efficiency:	APPEFF	0.95	fraction

Spray	Drift	DRFT	0.16	fraction	of	application

Application	Date	Date	15-04	dd/mm	or	dd/mmm

Record	17:00	FILTRA

	IPSCND	1

	UPTKF

	Record	18:00	PLVKRT

	PLDKRT

FEXTRC	0.5

Flag	for	Index	Res.	Run	IR	IR

Flag	for	runoff	calc.	RUNOFF	total	none,

DCSA

FL-Sugarcane (Ground)

stored	as	DCSAFLgr.out

Chemical:	dicamba

	PRZM	environment:	FLsugarcaneC.txt	modified	Satday,	12	October

EXAMS	environment:	ir298.exv	modified	Thuday,	29	August

Metfile:	w12844.dvf	modified	Wedday,	3	July	2002

Water	segment	concentrations	(ppb)

	Year	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

1961	1.243	1.138	0.7954	0.5673	0.4676	0.1382

1962	3.359	2.916	1.769	0.9972	0.8673	0.2724

1963	9.561	8.737	5.32	2.532	1.836	0.5195

1964	6.828	5.997	4.049	2.797	2.135	0.6127

1965	2.901	2.509	1.79	1.103	0.8277	0.2934

1966	3.094	2.685	1.9	1.368	1.027	0.3388

1967	4.058	3.56	2.58	1.531	1.139	0.3715

1968	6.505	5.663	4.866	3.061	2.283	0.6771

1969	5.996	5.224	3.769	2.362	1.826	0.5535

1970	4.595	3.97	3.276	2.027	1.462	0.4496

1971	5.078	4.559	2.703	1.59	1.311	0.3958

1972	13.48	11.72	7.929	5.287	3.84	1.067

1973	2.425	2.097	1.424	1.135	0.9363	0.3161

1974	1.066	0.9318	0.6087	0.4622	0.463	0.1782

1975	2.152	1.865	1.362	0.9197	0.7765	0.2476

1976	6.27	5.566	3.522	2.329	1.776	0.5192

1977	11.14	9.675	7.088	4.229	3.034	0.8698

1978	2.115	1.827	1.169	1.053	0.9648	0.3199

1979	18.2	15.9	9.859	4.988	3.598	0.9962

1980	3.612	3.145	2.295	1.574	1.258	0.3905

1981	2.74	2.372	1.645	1.059	0.87	0.2811

1982	11.7	10.54	7.088	3.865	2.911	0.8083

1983	2.462	2.226	1.923	1.025	0.8424	0.2724

1984	7.875	6.915	4.308	2.494	1.816	0.5499

1985	2.43	2.133	1.374	1.11	0.8724	0.2908

1986	2.015	1.796	1.338	0.9378	0.7002	0.2479

1987	4.987	4.319	2.852	1.546	1.226	0.3647

1988	8.004	7.033	4.393	3.095	2.378	0.6995

1989	10.33	9.641	6.104	2.817	2.013	0.5715

1990	3.093	2.675	1.71	1.109	0.9423	0.309

Sorted	results

	Prob.	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

0.032258	18.2	15.9	9.859	5.287	3.84	1.067

0.064516	13.48	11.72	7.929	4.988	3.598	0.9962

0.096774	11.7	10.54	7.088	4.229	3.034	0.8698

0.129032	11.14	9.675	7.088	3.865	2.911	0.8083

0.16129	10.33	9.641	6.104	3.095	2.378	0.6995

0.193548	9.561	8.737	5.32	3.061	2.283	0.6771

0.225806	8.004	7.033	4.866	2.817	2.135	0.6127

0.258065	7.875	6.915	4.393	2.797	2.013	0.5715

0.290323	6.828	5.997	4.308	2.532	1.836	0.5535

0.322581	6.505	5.663	4.049	2.494	1.826	0.5499

0.354839	6.27	5.566	3.769	2.362	1.816	0.5195

0.387097	5.996	5.224	3.522	2.329	1.776	0.5192

0.419355	5.078	4.559	3.276	2.027	1.462	0.4496

0.451613	4.987	4.319	2.852	1.59	1.311	0.3958

0.483871	4.595	3.97	2.703	1.574	1.258	0.3905

0.516129	4.058	3.56	2.58	1.546	1.226	0.3715

0.548387	3.612	3.145	2.295	1.531	1.139	0.3647

0.580645	3.359	2.916	1.923	1.368	1.027	0.3388

0.612903	3.094	2.685	1.9	1.135	0.9648	0.3199

0.645161	3.093	2.675	1.79	1.11	0.9423	0.3161

0.677419	2.901	2.509	1.769	1.109	0.9363	0.309

0.709677	2.74	2.372	1.71	1.103	0.8724	0.2934

0.741935	2.462	2.226	1.645	1.059	0.87	0.2908

0.774194	2.43	2.133	1.424	1.053	0.8673	0.2811

0.806452	2.425	2.097	1.374	1.025	0.8424	0.2724

0.83871	2.152	1.865	1.362	0.9972	0.8277	0.2724

0.870968	2.115	1.827	1.338	0.9378	0.7765	0.2479

0.903226	2.015	1.796	1.169	0.9197	0.7002	0.2476

0.935484	1.243	1.138	0.7954	0.5673	0.4676	0.1782

0.967742	1.066	0.9318	0.6087	0.4622	0.463	0.1382

0.1	11.644	10.4535	7.088	4.1926	3.0217	0.86365

	Average	of	yearly	averages:	0.46407

	Inputs	generated	by	pe4.pl	-	8-Aug-03

	Data	used	for	this	run:

Output	File:	DCSAFLgr

Metfile:	w12844.dvf

	PRZM	scenario:	FLsugarcaneC.txt

EXAMS	environment	file:	ir298.exv

	Chemical	Name:	dicamba

Description	Variable	Name	Value	Units	Comments

	Molecular	weight	mwt	207	g/mol

Henry's	Law	Const.	henry	1.60E-09	atm-m^3/mol

Vapor	Pressure	vapr	3.41E-05	torr

Solubility	sol	2112	mg/L

	Kd	Kd	mg/L

Koc	Koc	1208	mg/L

	Photolysis	half-life	kdp	38.1	days	Half-life

	Aerobic	Aquatic	Metabolism	kbacw	16.4	days	Halfife

Anaerobic	Aquatic	Metabolism	kbacs	0	days	Halfife

Aerobic	Soil	Metabolism	asm	24.6	days	Halfife

Hydrolysis:	pH	7	0	days	Half-life

	Method:	CAM	2	integer	See	PRZM	manual

Incorporation	Depth:	DEPI	0	cm

Application	Rate:	TAPP	0.45	kg/ha

Application	Efficiency:	APPEFF	1	fraction

Spray	Drift	DRFT	0.064	fraction	of	application

Application	Date	Date	15-04	dd/mm	or	dd/mmm

Record	17:00	FILTRA

	IPSCND	1

	UPTKF

	Record	18:00	PLVKRT

	PLDKRT

FEXTRC	0.5

Flag	for	Index	Res.	Run	IR	IR

Flag	for	runoff	calc.	RUNOFF	total	none,

FL-Sugarcane (Aerial)

stored	as	DCSAFLar.out

Chemical:	dicamba

	PRZM	environment:	FLsugarcaneC.txt	modified	Satday,	12	October

EXAMS	environment:	ir298.exv	modified	Thuday,	29	August

Metfile:	w12844.dvf	modified	Wedday,	3	July	2002

Water	segment	concentrations	(ppb)

	Year	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

1961	2.62	2.272	1.392	0.9495	0.7321	0.2084

1962	3.77	3.276	2.007	1.387	1.138	0.3458

1963	9.989	9.138	5.567	2.915	2.101	0.5916

1964	7.414	6.509	4.362	3.102	2.396	0.6835

1965	2.939	2.545	1.826	1.131	1.03	0.3644

1966	3.149	2.738	1.942	1.412	1.288	0.4123

1967	4.097	3.598	2.615	1.563	1.322	0.4439

1968	6.579	5.73	4.935	3.15	2.55	0.7497

1969	6.419	5.62	4.012	2.482	2.089	0.6252

1970	4.641	4.013	3.336	2.068	1.717	0.5192

1971	5.284	4.741	2.819	1.878	1.582	0.469

1972	14.05	12.22	8.383	5.612	4.103	1.139

1973	2.718	2.353	1.583	1.381	1.196	0.3865

1974	2.64	2.306	1.399	0.8208	0.7255	0.2494

1975	2.633	2.299	1.419	1.145	1.041	0.3195

1976	6.364	5.655	3.604	2.527	2.047	0.5928

1977	11.53	10.02	7.303	4.378	3.298	0.9415

1978	2.67	2.34	1.686	1.341	1.228	0.3915

1979	18.99	16.59	10.28	5.224	3.864	1.069

1980	3.724	3.245	2.383	1.949	1.53	0.4643

1981	2.834	2.456	1.703	1.345	1.128	0.3512

1982	12.53	11.26	7.531	4.145	3.17	0.8785

1983	2.669	2.343	1.976	1.2	1.112	0.3453

1984	7.969	7	4.371	2.542	2.034	0.6239

1985	4.004	3.513	2.218	1.497	1.141	0.3636

1986	2.639	2.319	1.435	0.9666	0.9627	0.3218

1987	5.241	4.542	3.059	1.92	1.506	0.4406

1988	8.563	7.522	4.692	3.241	2.639	0.7711

1989	11.91	11.01	6.931	3.192	2.272	0.6417

1990	3.187	2.759	1.774	1.374	1.204	0.3798

Sorted	results

	Prob.	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

0.032258	18.99	16.59	10.28	5.612	4.103	1.139

0.064516	14.05	12.22	8.383	5.224	3.864	1.069

0.096774	12.53	11.26	7.531	4.378	3.298	0.9415

0.129032	11.91	11.01	7.303	4.145	3.17	0.8785

0.16129	11.53	10.02	6.931	3.241	2.639	0.7711

0.193548	9.989	9.138	5.567	3.192	2.55	0.7497

0.225806	8.563	7.522	4.935	3.15	2.396	0.6835

0.258065	7.969	7	4.692	3.102	2.272	0.6417

0.290323	7.414	6.509	4.371	2.915	2.101	0.6252

0.322581	6.579	5.73	4.362	2.542	2.089	0.6239

0.354839	6.419	5.655	4.012	2.527	2.047	0.5928

0.387097	6.364	5.62	3.604	2.482	2.034	0.5916

0.419355	5.284	4.741	3.336	2.068	1.717	0.5192

0.451613	5.241	4.542	3.059	1.949	1.582	0.469

0.483871	4.641	4.013	2.819	1.92	1.53	0.4643

0.516129	4.097	3.598	2.615	1.878	1.506	0.4439

0.548387	4.004	3.513	2.383	1.563	1.322	0.4406

0.580645	3.77	3.276	2.218	1.497	1.288	0.4123

0.612903	3.724	3.245	2.007	1.412	1.228	0.3915

0.645161	3.187	2.759	1.976	1.387	1.204	0.3865

0.677419	3.149	2.738	1.942	1.381	1.196	0.3798

0.709677	2.939	2.545	1.826	1.374	1.141	0.3644

0.741935	2.834	2.456	1.774	1.345	1.138	0.3636

0.774194	2.718	2.353	1.703	1.341	1.128	0.3512

0.806452	2.67	2.343	1.686	1.2	1.112	0.3458

0.83871	2.669	2.34	1.583	1.145	1.041	0.3453

0.870968	2.64	2.319	1.435	1.131	1.03	0.3218

0.903226	2.639	2.306	1.419	0.9666	0.9627	0.3195

0.935484	2.633	2.299	1.399	0.9495	0.7321	0.2494

0.967742	2.62	2.272	1.392	0.8208	0.7255	0.2084

0.1	12.468	11.235	7.5082	4.3547	3.2852	0.9352

	Average	of	yearly	averages:	0.536133

	Inputs	generated	by	pe4.pl	-	8-Aug-03

	Data	used	for	this	run:

Output	File:	DCSAFLar

Metfile:	w12844.dvf

	PRZM	scenario:	FLsugarcaneC.txt

EXAMS	environment	file:	ir298.exv

	Chemical	Name:	dicamba

Description	Variable	Name	Value	Units	Comments

	Molecular	weight	mwt	207	g/mol

Henry's	Law	Const.	henry	1.60E-09	atm-m^3/mol

Vapor	Pressure	vapr	3.41E-05	torr

Solubility	sol	2112	mg/L

	Kd	Kd	mg/L

Koc	Koc	1208	mg/L

	Photolysis	half-life	kdp	38.1	days	Half-life

	Aerobic	Aquatic	Metabolism	kbacw	16.4	days	Halfife

Anaerobic	Aquatic	Metabolism	kbacs	0	days	Halfife

Aerobic	Soil	Metabolism	asm	24.6	days	Halfife

Hydrolysis:	pH	7	0	days	Half-life

	Method:	CAM	2	integer	See	PRZM	manual

Incorporation	Depth:	DEPI	0	cm

Application	Rate:	TAPP	0.45	kg/ha

Application	Efficiency:	APPEFF	1	fraction

Spray	Drift	DRFT	0.16	fraction	of	application

Application	Date	Date	15-04	dd/mm	or	dd/mmm

Record	17:00	FILTRA

	IPSCND	1

	UPTKF

	Record	18:00	PLVKRT

	PLDKRT

FEXTRC	0.5

Flag	for	Index	Res.	Run	IR	IR

Flag	for	runoff	calc.	RUNOFF	total	none,

AL-Sugarcane (Ground)

stored	as	DCSALAgr.out

Chemical:	dicamba

	PRZM	environment:	LAsugarcaneC.txt	modified	Satday,	12	October

EXAMS	environment:	ir298.exv	modified	Thuday,	29	August

Metfile:	w13970.dvf	modified	Wedday,	3	July	2002

Water	segment	concentrations	(ppb)

	Year	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

1961	3.41	3.034	2.489	1.464	1.137	0.3631

1962	9.88	9.092	5.763	2.991	2.257	0.6805

1963	1.106	0.9817	0.6356	0.3182	0.2755	0.1323

1964	3.022	2.659	2.024	1.152	0.8616	0.2692

1965	1.785	1.586	1.088	0.6734	0.5138	0.1679

1966	7.31	6.548	4.46	2.438	1.785	0.5322

1967	3.271	2.897	1.958	1.28	0.9692	0.3248

1968	1.078	0.9594	0.7175	0.4415	0.3233	0.1198

1969	1.064	0.9579	0.8035	0.5646	0.4229	0.1487

1970	3.634	3.311	2.143	1.474	1.093	0.336

1971	1.079	0.9678	0.6823	0.5786	0.4714	0.1747

1972	6.735	6.095	4.538	2.27	1.698	0.5165

1973	13.64	12.27	8.424	4.754	3.408	1

1974	1.361	1.219	0.8775	0.6956	0.5351	0.207

1975	6.814	6.052	4.03	2.182	1.649	0.5073

1976	3.647	3.278	2.184	1.222	0.9546	0.3221

1977	10.16	9.089	6.818	3.613	2.583	0.7698

1978	5.705	5.012	3.3	1.79	1.343	0.4513

1979	14.68	13.12	8.769	4.61	3.339	1.002

1980	3.817	3.489	2.335	1.556	1.254	0.4246

1981	3.106	2.756	1.816	1.172	0.9078	0.2875

1982	3.154	2.936	1.925	1.128	0.8256	0.2529

1983	2.437	2.163	1.568	1.153	1.01	0.3226

1984	1.09	0.9684	0.6545	0.5829	0.4563	0.1611

1985	1.063	0.9473	0.6173	0.4334	0.3691	0.1347

1986	2.489	2.224	1.46	1.326	1.036	0.3121

1987	1.474	1.3	0.8817	0.6433	0.5186	0.1888

1988	1.324	1.184	0.8736	0.5321	0.4162	0.1444

1989	5.491	4.981	3.839	2.698	2.067	0.6309

1990	1.106	0.9918	0.7739	0.6021	0.5198	0.1966

Sorted	results

	Prob.	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

0.032258	14.68	13.12	8.769	4.754	3.408	1.002

0.064516	13.64	12.27	8.424	4.61	3.339	1

0.096774	10.16	9.092	6.818	3.613	2.583	0.7698

0.129032	9.88	9.089	5.763	2.991	2.257	0.6805

0.16129	7.31	6.548	4.538	2.698	2.067	0.6309

0.193548	6.814	6.095	4.46	2.438	1.785	0.5322

0.225806	6.735	6.052	4.03	2.27	1.698	0.5165

0.258065	5.705	5.012	3.839	2.182	1.649	0.5073

0.290323	5.491	4.981	3.3	1.79	1.343	0.4513

0.322581	3.817	3.489	2.489	1.556	1.254	0.4246

0.354839	3.647	3.311	2.335	1.474	1.137	0.3631

0.387097	3.634	3.278	2.184	1.464	1.093	0.336

0.419355	3.41	3.034	2.143	1.326	1.036	0.3248

0.451613	3.271	2.936	2.024	1.28	1.01	0.3226

0.483871	3.154	2.897	1.958	1.222	0.9692	0.3221

0.516129	3.106	2.756	1.925	1.172	0.9546	0.3121

0.548387	3.022	2.659	1.816	1.153	0.9078	0.2875

0.580645	2.489	2.224	1.568	1.152	0.8616	0.2692

0.612903	2.437	2.163	1.46	1.128	0.8256	0.2529

0.645161	1.785	1.586	1.088	0.6956	0.5351	0.207

0.677419	1.474	1.3	0.8817	0.6734	0.5198	0.1966

0.709677	1.361	1.219	0.8775	0.6433	0.5186	0.1888

0.741935	1.324	1.184	0.8736	0.6021	0.5138	0.1747

0.774194	1.106	0.9918	0.8035	0.5829	0.4714	0.1679

0.806452	1.106	0.9817	0.7739	0.5786	0.4563	0.1611

0.83871	1.09	0.9684	0.7175	0.5646	0.4229	0.1487

0.870968	1.079	0.9678	0.6823	0.5321	0.4162	0.1444

0.903226	1.078	0.9594	0.6545	0.4415	0.3691	0.1347

0.935484	1.064	0.9579	0.6356	0.4334	0.3233	0.1323

0.967742	1.063	0.9473	0.6173	0.3182	0.2755	0.1198

0.1	10.132	9.0917	6.7125	3.5508	2.5504	0.76087

	Average	of	yearly	averages:	0.36938

	Inputs	generated	by	pe4.pl	-	8-Aug-03

	Data	used	for	this	run:

Output	File:	DCSALAgr

Metfile:	w13970.dvf

	PRZM	scenario:	LAsugarcaneC.txt

EXAMS	environment	file:	ir298.exv

	Chemical	Name:	dicamba

Description	Variable	Name	Value	Units	Comments

	Molecular	weight	mwt	207	g/mol

Henry's	Law	Const.	henry	1.60E-09	atm-m^3/mol

Vapor	Pressure	vapr	3.41E-05	torr

Solubility	sol	2112	mg/L

	Kd	Kd	mg/L

Koc	Koc	1208	mg/L

	Photolysis	half-life	kdp	38.1	days	Half-life

	Aerobic	Aquatic	Metabolism	kbacw	16.4	days	Halfife

Anaerobic	Aquatic	Metabolism	kbacs	0	days	Halfife

Aerobic	Soil	Metabolism	asm	24.6	days	Halfife

Hydrolysis:	pH	7	0	days	Half-life

	Method:	CAM	2	integer	See	PRZM	manual

Incorporation	Depth:	DEPI	0	cm

Application	Rate:	TAPP	0.45	kg/ha

Application	Efficiency:	APPEFF	1	fraction

Spray	Drift	DRFT	0.064	fraction	of	application

Application	Date	Date	15-04	dd/mm	or	dd/mmm

Record	17:00	FILTRA

	IPSCND	1

	UPTKF

	Record	18:00	PLVKRT

	PLDKRT

FEXTRC	0.5

Flag	for	Index	Res.	Run	IR	IR

Flag	for	runoff	calc.	RUNOFF	total	none,

AL-Sugarcane (Aerial)

stored	as	DCSALAar.out

Chemical:	dicamba

	PRZM	environment:	LAsugarcaneC.txt	modified	Satday,	12	October

EXAMS	environment:	ir298.exv	modified	Thuday,	29	August

Metfile:	w13970.dvf	modified	Wedday,	3	July	2002

Water	segment	concentrations	(ppb)

	Year	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

1961	4.042	3.595	3.001	1.926	1.461	0.4513

1962	10.69	9.821	6.223	3.372	2.567	0.7666

1963	2.682	2.374	1.51	0.7311	0.5628	0.2123

1964	3.623	3.202	2.565	1.576	1.157	0.3512

1965	3.014	2.675	1.973	1.097	0.8091	0.2503

1966	8.422	7.543	5.102	2.878	2.092	0.6179

1967	3.747	3.319	2.283	1.696	1.259	0.4061

1968	2.654	2.36	1.614	0.872	0.6233	0.2033

1969	2.635	2.363	1.711	1.002	0.7276	0.2335

1970	4.196	3.81	2.762	1.903	1.392	0.4196

1971	2.656	2.378	1.567	1.03	0.7867	0.2623

1972	7.041	6.384	4.777	2.698	1.996	0.5989

1973	15.05	13.53	9.303	5.204	3.722	1.087

1974	2.937	2.622	1.783	1.125	0.835	0.2907

1975	7.5	6.662	4.416	2.625	1.961	0.5942

1976	4.019	3.611	2.408	1.669	1.267	0.4095

1977	11.27	10.08	7.477	4.049	2.886	0.8543

1978	6.128	5.385	3.603	2.223	1.644	0.5349

1979	15.72	14.04	9.405	5.026	3.646	1.088

1980	4.067	3.711	2.483	1.997	1.56	0.5097

1981	3.567	3.167	2.173	1.598	1.204	0.37

1982	4.265	3.929	2.784	1.562	1.127	0.3365

1983	2.647	2.385	1.978	1.61	1.337	0.4137

1984	2.655	2.369	1.542	1.023	0.7634	0.2468

1985	2.639	2.351	1.523	0.8687	0.6725	0.2191

1986	3.661	3.269	2.365	1.757	1.336	0.3952

1987	2.654	2.377	1.565	1.086	0.8274	0.2747

1988	2.646	2.462	1.784	0.9711	0.7223	0.2292

1989	5.674	5.154	4.128	2.845	2.371	0.7153

1990	2.682	2.399	1.688	1.037	0.8219	0.2804

Sorted	results

	Prob.	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

0.032258	15.72	14.04	9.405	5.204	3.722	1.088

0.064516	15.05	13.53	9.303	5.026	3.646	1.087

0.096774	11.27	10.08	7.477	4.049	2.886	0.8543

0.129032	10.69	9.821	6.223	3.372	2.567	0.7666

0.16129	8.422	7.543	5.102	2.878	2.371	0.7153

0.193548	7.5	6.662	4.777	2.845	2.092	0.6179

0.225806	7.041	6.384	4.416	2.698	1.996	0.5989

0.258065	6.128	5.385	4.128	2.625	1.961	0.5942

0.290323	5.674	5.154	3.603	2.223	1.644	0.5349

0.322581	4.265	3.929	3.001	1.997	1.56	0.5097

0.354839	4.196	3.81	2.784	1.926	1.461	0.4513

0.387097	4.067	3.711	2.762	1.903	1.392	0.4196

0.419355	4.042	3.611	2.565	1.757	1.337	0.4137

0.451613	4.019	3.595	2.483	1.696	1.336	0.4095

0.483871	3.747	3.319	2.408	1.669	1.267	0.4061

0.516129	3.661	3.269	2.365	1.61	1.259	0.3952

0.548387	3.623	3.202	2.283	1.598	1.204	0.37

0.580645	3.567	3.167	2.173	1.576	1.157	0.3512

0.612903	3.014	2.675	1.978	1.562	1.127	0.3365

0.645161	2.937	2.622	1.973	1.125	0.835	0.2907

0.677419	2.682	2.462	1.784	1.097	0.8274	0.2804

0.709677	2.682	2.399	1.783	1.086	0.8219	0.2747

0.741935	2.656	2.385	1.711	1.037	0.8091	0.2623

0.774194	2.655	2.378	1.688	1.03	0.7867	0.2503

0.806452	2.654	2.377	1.614	1.023	0.7634	0.2468

0.83871	2.654	2.374	1.567	1.002	0.7276	0.2335

0.870968	2.647	2.369	1.565	0.9711	0.7223	0.2292

0.903226	2.646	2.363	1.542	0.872	0.6725	0.2191

0.935484	2.639	2.36	1.523	0.8687	0.6233	0.2123

0.967742	2.635	2.351	1.51	0.7311	0.5628	0.2033

0.1	11.212	10.0541	7.3516	3.9813	2.8541	0.84553

	Average	of	yearly	averages:	0.454083

	Inputs	generated	by	pe4.pl	-	8-Aug-03

	Data	used	for	this	run:

Output	File:	DCSALAar

Metfile:	w13970.dvf

	PRZM	scenario:	LAsugarcaneC.txt

EXAMS	environment	file:	ir298.exv

	Chemical	Name:	dicamba

Description	Variable	Name	Value	Units	Comments

	Molecular	weight	mwt	207	g/mol

Henry's	Law	Const.	henry	1.60E-09	atm-m^3/mol

Vapor	Pressure	vapr	3.41E-05	torr

Solubility	sol	2112	mg/L

	Kd	Kd	mg/L

Koc	Koc	1208	mg/L

	Photolysis	half-life	kdp	38.1	days	Half-life

	Aerobic	Aquatic	Metabolism	kbacw	16.4	days	Halfife

Anaerobic	Aquatic	Metabolism	kbacs	0	days	Halfife

Aerobic	Soil	Metabolism	asm	24.6	days	Halfife

Hydrolysis:	pH	7	0	days	Half-life

	Method:	CAM	2	integer	See	PRZM	manual

Incorporation	Depth:	DEPI	0	cm

Application	Rate:	TAPP	0.45	kg/ha

Application	Efficiency:	APPEFF	1	fraction

Spray	Drift	DRFT	0.16	fraction	of	application

Application	Date	Date	15-04	dd/mm	or	dd/mmm

Record	17:00	FILTRA

	IPSCND	1

	UPTKF

	Record	18:00	PLVKRT

	PLDKRT

FEXTRC	0.5

Flag	for	Index	Res.	Run	IR	IR

Flag	for	runoff	calc.	RUNOFF	total	none,

                           SCIGROW

                          VERSION 2.3

            ENVIRONMENTAL FATE AND EFFECTS DIVISION

OFFICE OF PESTICIDE PROGRAMS

             U.S. ENVIRONMENTAL PROTECTION AGENCY

                        SCREENING MODEL

                FOR AQUATIC PESTICIDE EXPOSURE

 SciGrow version 2.3

 chemical:dicamba

 time is  6/ 1/2005  14:59:35

 ----------------------------------------------------------------------- -

  Application      Number of       Total Use    Koc      Soil Aerobic

  rate (lb/acre)  applications      (lb/acre/yr)  (ml/g)   metabolism (days)

 ----------------------------------------------------------------------- -

      2.800              1.0                  2.800      3.45E+00        6.0

 ----------------------------------------------------------------------- -

 groundwater screening cond (ppb) =   1.61E-02

 *********************************************************************** *

                           SCIGROW

                          VERSION 2.3

            ENVIRONMENTAL FATE AND EFFECTS DIVISION

                 OFFICE OF PESTICIDE PROGRAMS

             U.S. ENVIRONMENTAL PROTECTION AGENCY

                        SCREENING MODEL

                FOR AQUATIC PESTICIDE EXPOSURE

 SciGrow version 2.3

 chemical:DCSA

 time is  6/ 1/2005  15: 0:52

 ----------------------------------------------------------------------- -

  Application      Number of       Total Use    Koc      Soil Aerobic

  rate (lb/acre)  applications      (lb/acre/yr)  (ml/g)   metabolism (days)

 ----------------------------------------------------------------------- -

      0.446                 1.0                 0.446      2.42E+02        8.2

 ----------------------------------------------------------------------- -

 groundwater screening cond (ppb) =   8.01E-03

 *********************************************************************** *

 PAGE  3


[Federal Register Volume 86, Number 219 (Wednesday, November 17, 2021)]
[Notices]
[Pages 64277-64280]
[FR Doc No: 2021-25015]

-----------------------------------------------------------------------

SECURITIES AND EXCHANGE COMMISSION

[Release No. 34-93550; File No. SR-MIAX-2021-56]

Self-Regulatory Organizations; Miami International Securities
Exchange, LLC; Notice of Filing and Immediate Effectiveness of Proposed
Rule Change To Amend the MIAX Options Fee Schedule

November 10, 2021.
    Pursuant to Section 19(b)(1) of the Securities Exchange Act of 1934
(``Act''),\1\ and Rule 19b-4 thereunder,\2\ notice is hereby given that
on October 29, 2021, Miami International Securities Exchange, LLC
(``MIAX'' or ``Exchange'') filed with the Securities and Exchange
Commission (``Commission'') the proposed rule change as described in
Items I, II, and III below, which Items have been prepared by the
Exchange. The Commission is publishing this notice to solicit comments
on the proposed rule change from interested persons.
---------------------------------------------------------------------------

    \1\ 15 U.S.C. 78s(b)(1).
    \2\ 17 CFR 240.19b-4.
---------------------------------------------------------------------------

I. Self-Regulatory Organization's Statement of the Terms of Substance
of the Proposed Rule Change

    The Exchange is filing a proposal to amend the MIAX Options Fee
Schedule (the ``Fee Schedule'').
    The text of the proposed rule change is available on the Exchange's
website at http://www.miaxoptions.com/rule-filings, at MIAX's principal
office, and at the Commission's Public Reference Room.

II. Self-Regulatory Organization's Statement of the Purpose of, and
Statutory Basis for, the Proposed Rule Change

    In its filing with the Commission, the Exchange included statements
concerning the purpose of and basis for the proposed rule change and
discussed any comments it received on the proposed rule change. The
text of these statements may be examined at the places specified in
Item IV below. The Exchange has prepared summaries, set forth in
sections A, B, and C below, of the most significant aspects of such
statements.

A. Self-Regulatory Organization's Statement of the Purpose of, and
Statutory Basis for, the Proposed Rule Change

1. Purpose
    The Exchange proposes to amend the Fee Schedule to: (1) Amend the
criteria for Members \3\ to receive the additional incremental MIAX
Price Improvement Mechanism (``PRIME'') Agency Order (defined below)
credit that is available for Priority Customer \4\ PRIME Agency Orders
for Members who achieve Priority Customer Rebate Program (``PCRP'')
Tier 3 or higher and who achieve over a threshold of 0.60% of national
customer volume in multiply-listed options classes listed on MIAX
during the relevant month; and (2) make a minor, non-substantive
corrective edit.
---------------------------------------------------------------------------

    \3\ The term ``Member'' means an individual or organization
approved to exercise the trading rights associated with a Trading
Permit. Members are deemed ``members'' under the Exchange Act. See
Exchange Rule 100.
    \4\ ``Priority Customer'' means a person or entity that (i) is
not a broker or dealer in securities, and (ii) does not place more
than 390 orders in listed options per day on average during a
calendar month for its own beneficial accounts(s). A ``Priority
Customer Order'' means an order for the account of a Priority
Customer. See Exchange Rule 100.
---------------------------------------------------------------------------

Background
    PRIME is a process by which a Member may electronically submit for
execution an order it represents as agent (an ``Agency Order'') against
principal interest and/or solicited interest. The Member that submits
the Agency Order (``Initiating Member'') agrees to guarantee the
execution of the Agency Order by submitting a contra-side order
representing principal interest or solicited interest (``Contra-Side
Order''). When the Exchange receives a properly designated Agency Order
for Auction processing, a request for response (``RFR'') detailing the
option, side, size and initiating price is broadcasted to MIAX
participants up to an optional designated limit price. Members may
submit responses to the RFR, which can be either an Auction or Cancel
(``AOC'') order or an AOC eQuote. The PRIME mechanism applies to orders
on the Exchange's Simple Order Book.\5\
---------------------------------------------------------------------------

    \5\ The ``Simple Order Book'' is the Exchange's regular
electronic book of orders and quotes. See Exchange Rule 518(a)(15).
---------------------------------------------------------------------------

    The Priority Customer rebate payment is calculated from the first
executed contract at the applicable threshold per contract credit with
rebate payments made at the highest achieved volume tier for each
contract traded in that month. The percentage thresholds are calculated
based on the percentage of national customer volume in multiply-listed
options classes listed on MIAX entered and executed over the course of
the month (excluding QCC and cQCC Orders, Priority Customer-to-Priority
Customer Orders, C2C and cC2C Orders, PRIME and cPRIME AOC Responses,
PRIME and cPRIME Contra-side Orders, and PRIME and cPRIME Orders for

which both the Agency and Contra-side Order are Priority Customers).
Volume for transactions in both simple and complex orders are
aggregated to determine the appropriate volume tier threshold
applicable to each transaction. Volume is recorded for and credits are
delivered to the Member that submits the order to MIAX. MIAX aggregates
the contracts resulting from Priority Customer orders transmitted and
executed electronically on MIAX from Members and their Affiliates \6\
for purposes of the thresholds described in the PCRP table.
---------------------------------------------------------------------------

    \6\ The term ``Affiliate'' means (i) an affiliate of a Member of
at least 75% common ownership between the firms as reflected on each
firm's Form BD, Schedule A, (``Affiliate''), or (ii) the Appointed
Market Maker of an Appointed EEM (or, conversely, the Appointed EEM
of an Appointed Market Maker). An ``Appointed Market Maker'' is a
MIAX Market Maker (who does not otherwise have a corporate
affiliation based upon common ownership with an EEM) that has been
appointed by an EEM and an ``Appointed EEM'' is an EEM (who does not
otherwise have a corporate affiliation based upon common ownership
with a MIAX Market Maker) that has been appointed by a MIAX Market
Maker, pursuant to the following process. A MIAX Market Maker
appoints an EEM and an EEM appoints a MIAX Market Maker, for the
purposes of the Fee Schedule, by each completing and sending an
executed Volume Aggregation Request Form by email to
[email protected] no later than 2 business days prior to
the first business day of the month in which the designation is to
become effective. Transmittal of a validly completed and executed
form to the Exchange along with the Exchange's acknowledgement of
the effective designation to each of the Market Maker and EEM will
be viewed as acceptance of the appointment. The Exchange will only
recognize one designation per Member. A Member may make a
designation not more than once every 12 months (from the date of its
most recent designation), which designation shall remain in effect
unless or until the Exchange receives written notice submitted 2
business days prior to the first business day of the month from
either Member indicating that the appointment has been terminated.
Designations will become operative on the first business day of the
effective month and may not be terminated prior to the end of the
month. Execution data and reports will be provided to both parties.
See Fee Schedule, note 1.
---------------------------------------------------------------------------

Additional Agency Order Credit for Members in PCRP Tier 3 or Higher
    The Exchange proposes to amend Section 1(a)(iii) of the Fee
Schedule to amend the criteria for Members to receive the additional
PRIME Agency Order credit that is available for Priority Customer PRIME
Agency Orders for Members who achieve PCRP Tier 3 or higher and who
achieve over a threshold of 0.60% of national customer volume in
multiply-listed options classes listed on MIAX during the relevant
month. Currently, any Member or its Affiliate that qualifies for PCRP
Tier 3 or higher is credited an additional $0.01 per contract on
incremental volume for each Priority Customer order executed in the
PRIME Auction as a PRIME Agency Order over a threshold of above 0.60%
of national customer volume in multiply-listed options classes listed
on MIAX during the relevant month.\7\
---------------------------------------------------------------------------

    \7\ The Exchange notes that the following orders are excluded
from counting towards this threshold: QCC and cQCC Orders, mini-
options, Priority Customer-to-Priority Customer Orders, C2C and cC2C
Orders, cPRIME Agency Orders, PRIME and cPRIME AOC Responses, PRIME
and cPRIME Contra-side Orders, PRIME and cPRIME Orders for which
both the Agency and Contra-side Order are Priority Customers, and
executions related to contracts that are routed to one or more
exchanges in connection with the Options Order Protection and
Locked/Crossed Market Plan referenced in MIAX Rule 1400. See Fee
Schedule, Section 1(a)(iii).
---------------------------------------------------------------------------

    The Exchange proposes to amend the criteria to include an
additional requirement for Members to receive the additional PRIME
Agency Order credit that is available for Priority Customer PRIME
Agency Orders for Members who achieve PCRP Tier 3 or higher and who
achieve over a threshold of 0.60% of national customer volume in
multiply-listed options classes listed on MIAX during the relevant
month. To qualify for the additional PRIME Agency Order credit, the
Exchange proposes that Members must also achieve greater than 0.85% in
Priority Customer complex volume on MIAX during a relevant month,
represented as a percentage of the total national customer volume in
multiply-listed options classes listed on MIAX during the same month.
Accordingly, with the proposed change, Members will be eligible to
receive the additional PRIME Agency Order credit of $0.01 per contract
for their incremental Priority Customer PRIME Agency Orders if the
Member executes over a monthly threshold of 0.60% of national customer
volume in multiply-listed options classes listed on MIAX during the
relevant month, the Member achieves PCRP Tier 3 or higher, and the
Member achieves greater than 0.85% in Priority Customer complex volume
on MIAX during a particular month, represented as a percentage of
national customer volume in multiply-listed options classes listed on
MIAX during the relevant month.
Fee Schedule Cleanup Item
    The Exchange also proposes to amend Section 1(a)(iv) of the Fee
Schedule to make a minor, non-substantive corrective edit. In
particular, the Exchange proposes to amend the explanatory paragraph
immediately below the table in Section 1(a)(iv) of the Fee Schedule to
delete the phrase ``Non-Priority Customer-to-Non-Priority Customer
Orders.'' The purpose of this change is to remove an order type that
does not exist on the Exchange, which will provide clarity to all
market participants that the Fee Schedule is accurate and concise.
Implementation
    The proposed changes will become effective on November 1, 2021.
2. Statutory Basis
    The Exchange believes the proposed rule change is consistent with
the Act and the rules and regulations thereunder applicable to the
Exchange and, in particular, the requirements of Section 6(b) of the
Act.\8\ Specifically, the Exchange believes the proposed rule change is
consistent with the Section 6(b)(5) \9\ requirements that the rules of
an exchange be designed to prevent fraudulent and manipulative acts and
practices, to promote just and equitable principles of trade, to foster
cooperation and coordination with persons engaged in regulating,
clearing, settling, processing information with respect to, and
facilitating transactions in securities, to remove impediments to and
perfect the mechanism of a free and open market and a national market
system, and, in general, to protect investors and the public interest.
Additionally, the Exchange believes the proposed rule change is
consistent with the Section 6(b)(5) \10\ requirement that the rules of
an exchange not be designed to permit unfair discrimination between
customers, issuers, brokers, or dealers.
---------------------------------------------------------------------------

    \8\ 15 U.S.C. 78f(b).
    \9\ 15 U.S.C. 78f(b)(5).
    \10\ Id.
---------------------------------------------------------------------------

    The Exchange believes that its proposal provides for the equitable
allocation of reasonable dues and fees and is not unfairly
discriminatory for the following reasons. The Exchange operates in a
highly competitive market. The Commission has repeatedly expressed its
preference for competition over regulatory intervention in determining
prices, products, and services in the securities markets. In Regulation
NMS, the Commission highlighted the importance of market forces in
determining prices and SRO revenues and, also, recognized that current
regulation of the market system ``has been remarkably successful in
promoting market competition in its broader forms that are most
important to investors and listed companies.'' \11\ There are currently
16 registered options exchanges competing for order flow. Based on
publicly-available information, and excluding index-based options, as
of October 20, 2021, no

single exchange has more than approximately 12% of the market share of
executed volume of multiply-listed equity and exchange-traded fund
(``ETF'') options trades, for the month of October 2021.\12\ Therefore,
no exchange possesses significant pricing power in the execution of
multiply-listed equity and ETF options order flow. More specifically,
as of October 20, 2021, the Exchange had a market share of
approximately 5.87% of executed volume of multiply-listed equity and
ETF options for the month of October 2021.\13\
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    \11\ See Securities Exchange Act Release No. 51808 (June 9,
2005), 70 FR 37496 (June 29, 2005).
    \12\ See MIAX's ``The Market at a Glance'', available at https://www.miaxoptions.com/ (last visited October 20, 2021).
    \13\ See id.
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    The Exchange believes that the ever-shifting market shares among
the exchanges from month to month demonstrates that market participants
can shift order flow, or discontinue or reduce use of certain
categories of products, in response to transaction and/or non-
transaction fee changes. For example, on February 28, 2019, the
Exchange's affiliate, MIAX PEARL, LLC (``MIAX Pearl''), filed with the
Commission a proposal to increase Taker fees in certain Tiers for
options transactions in certain Penny classes for Priority Customers
and decrease Maker rebates in certain Tiers for options transactions in
Penny classes for Priority Customers (which fee was to be effective
March 1, 2019).\14\ MIAX Pearl experienced a decrease in total market
share between the months of February and March of 2019, after the fees
were in effect. Accordingly, the Exchange believes that the MIAX Pearl
March 1, 2019, fee change may have contributed to the decrease in the
MIAX Pearl's market share and, as such, the Exchange believes
competitive forces constrain options exchange transaction fees and
market participants can shift order flow based on fee changes
instituted by the exchanges.
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    \14\ See Securities Exchange Act Release No. 85304 (March 13,
2019), 84 FR 10144 (March 19, 2019) (SR-PEARL-2019-07).
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    Accordingly, competitive forces constrain the Exchange's
transaction fees, and market participants can readily trade on
competing venues if they deem pricing levels at those other venues to
be more favorable. In response to the competitive environment, the
Exchange offers specific rates and credits in its fee schedule, like
those of other options exchanges', which the Exchange believes provides
incentives to Members to increase order flow of certain qualifying
orders.
    The Exchange believes its proposal to amend the criteria for
Members to receive the additional PRIME Agency Order credit that is
available for Priority Customer PRIME Agency Orders for Members who
achieve PCRP Tier 3 or higher to include an additional requirement is
reasonable, equitably allocated and not unfairly discriminatory because
this change is for business and competitive reasons.
    The Exchange believes its proposal is consistent with Section
6(b)(4) of the Act \15\ because it applies equally to all participants
with similar order flow who reach Tier 3 of the PCRP or higher. The
Exchange believes that the proposed new requirement to achieve the
additional PRIME Agency Order credit will encourage market participants
to execute greater Priority Customer complex volume in order to receive
the additional PRIME Agency Order credit. The Exchange believes this
will result in increased liquidity that benefits all Exchange
participants by providing more trading opportunities and tighter
spreads.
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    \15\ 15 U.S.C. 78f(b)(4).
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    Further, the Exchange believes that its proposal will continue to
encourage Priority Customer order flow to PRIME Auctions. Increased
Priority Customer order flow benefits all market participants because
it continues to attract liquidity to the Exchange by providing more
trading opportunities. This attracts Market Makers and other liquidity
providers, thus, facilitating price improvement in the auction process,
signaling additional corresponding increase in order flow from other
market participants, and, as a result, increasing liquidity on the
Exchange. The PCRP is reasonably designed because it incentivizes
providers of Priority Customer order flow to send that Priority
Customer order flow to the Exchange in order to obtain the highest
volume threshold and receive a credit in a manner that enables the
Exchange to improve its overall competitiveness and strengthen its
market quality for all market participants.
    In addition, the Exchange believes that its proposal is consistent
with Section 6(b)(5) of the Act \16\ because it perfects the mechanisms
of a free and open market and a national market system and protects
investors and the public interest because an increase in Priority
Customer order flow will bring greater volume and liquidity to the
Exchange, which benefits all market participants by providing more
trading opportunities and tighter spreads. To the extent Priority
Customer order flow and complex order flow is increased by this
proposal, market participants will increasingly compete for the
opportunity to trade on the Exchange including sending more orders and
provided narrower and larger-sized quotations in the effort to trade
with such Priority Customer and/or complex order flow.
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    \16\ 15 U.S.C. 78f(b)(4).
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    The Exchange believes the proposed change to remove the incorrect
phrase regarding a certain order type promotes just and equitable
principles of trade and removes impediments to and perfects the
mechanism of a free and open market and a national market system
because the proposed change makes a clarifying, non-substantive edit to
the Fee Schedule. The Exchange believes that this proposed change will
provide greater clarity to Members and the public regarding the
Exchange's Fee Schedule and that it is in the public interest for the
Fee Schedule to be accurate and concise so as to eliminate the
potential for confusion.

B. Self-Regulatory Organization's Statement on Burden on Competition

    The Exchange does not believe that the proposed rule change will
result in any burden on competition that is not necessary or
appropriate in furtherance of the purposes of the Act.
Intra-Market Competition
    The Exchange does not believe that other market participants at the
Exchange would be placed at a relative disadvantage by the proposed
change to amend the criteria for Members to receive the additional
PRIME Agency Order credit that is available for Priority Customer PRIME
Agency Orders for Members who achieve PCRP Tier 3 or higher to include
an additional requirement. The proposed change is designed to attract
additional order flow to the Exchange. Accordingly, the Exchange
believes that the proposal will not impose any burden on competition
not necessary or appropriate in furtherance of the purposes of the Act
because it will continue to encourage Priority Customer order flow and
an increase in Priority Customer order flow will bring greater volume
and liquidity, which benefits all market participants by providing more
trading opportunities and tighter spreads.
Inter-Market Competition
    The Exchange operates in a highly competitive market in which
market participants can readily favor competing venues if they deem fee
levels at a particular venue to be excessive. There are currently 16
registered options exchanges competing for order flow. Based on
publicly-available

information, and excluding index-based options, no single exchange has
exceeded approximately 12% of the market share of executed volume of
multiply-listed equity and ETF options trades as of October 20, 2021,
for the month of October 2021.\17\ Therefore, no exchange possesses
significant pricing power in the execution of multiply-listed equity
and ETF options order flow. More specifically, as of October 20, 2021,
the Exchange had a market share of approximately 5.87% of executed
volume of multiply-listed equity and ETF options for the month of
October 2021. In such an environment, the Exchange must continually
adjust its transaction and non-transaction fees to remain competitive
with other exchanges and to attract order flow. The Exchange believes
that the proposed rule changes reflect this competitive environment
because they modify the Exchange's fees in a manner that encourages
market participants to provide Priority Customer liquidity and to send
order flow to the Exchange. To the extent this is achieved, all the
Exchange's market participants should benefit from the improved market
quality.
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    \17\ See supra note 12.
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Fee Schedule Cleanup Item
    The Exchange believes that the proposed change to remove an
incorrect order type will not result in any burden on competition that
is not necessary or appropriate in furtherance of the purposes of the
Act. The proposed rule change is not a competitive filing but rather is
designed to remedy a minor non-substantive issue and provide added
clarity to the Fee Schedule in order to avoid potential confusion on
the part of market participants. In addition, the Exchange does not
believe the proposal will impose any burden on inter-market competition
as the proposal does not address any competitive issues and is intended
to protect investors by providing further transparency regarding the
Exchange's Fee Schedule.

C. Self-Regulatory Organization's Statement on Comments on the Proposed
Rule Change Received From Members, Participants, or Others

    Written comments were neither solicited nor received.

III. Date of Effectiveness of the Proposed Rule Change and Timing for
Commission Action

    The foregoing rule change has become effective pursuant to Section
19(b)(3)(A)(ii) of the Act,\18\ and Rule 19b-4(f)(2) \19\ thereunder.
At any time within 60 days of the filing of the proposed rule change,
the Commission summarily may temporarily suspend such rule change if it
appears to the Commission that such action is necessary or appropriate
in the public interest, for the protection of investors, or otherwise
in furtherance of the purposes of the Act. If the Commission takes such
action, the Commission shall institute proceedings to determine whether
the proposed rule should be approved or disapproved.
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    \18\ 15 U.S.C. 78s(b)(3)(A)(ii).
    \19\ 17 CFR 240.19b-4(f)(2).
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IV. Solicitation of Comments

    Interested persons are invited to submit written data, views, and
arguments concerning the foregoing, including whether the proposed rule
change is consistent with the Act. Comments may be submitted by any of
the following methods:

Electronic Comments

     Use the Commission's internet comment form (http://www.sec.gov/rules/sro.shtml); or
     Send an email to [email protected]. Please include
File Number SR-MIAX-2021-56 on the subject line.

Paper Comments

     Send paper comments in triplicate to Secretary, Securities
and Exchange Commission, 100 F Street NE, Washington, DC 20549-1090.

All submissions should refer to File Number SR-MIAX-2021-56. This file
number should be included on the subject line if email is used. To help
the Commission process and review your comments more efficiently,
please use only one method. The Commission will post all comments on
the Commission's internet website (http://www.sec.gov/rules/sro.shtml).
Copies of the submission, all subsequent amendments, all written
statements with respect to the proposed rule change that are filed with
the Commission, and all written communications relating to the proposed
rule change between the Commission and any person, other than those
that may be withheld from the public in accordance with the provisions
of 5 U.S.C. 552, will be available for website viewing and printing in
the Commission's Public Reference Room, 100 F Street NE, Washington, DC
20549, on official business days between the hours of 10:00 a.m. and
3:00 p.m. Copies of the filing also will be available for inspection
and copying at the principal office of the Exchange. All comments
received will be posted without change. Persons submitting comments are
cautioned that we do not redact or edit personal identifying
information from comment submissions. You should submit only
information that you wish to make available publicly. All submissions
should refer to File Number SR-MIAX-2021-56, and should be submitted on
or before December 8, 2021.

    For the Commission, by the Division of Trading and Markets,
pursuant to delegated authority.\20\
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    \20\ 17 CFR 200.30-3(a)(12).
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J. Matthew DeLesDernier,
Assistant Secretary.
[FR Doc. 2021-25015 Filed 11-16-21; 8:45 am]
BILLING CODE 8011-01-P