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**UNITED STATES ENVIRONMENTAL PROTECTION AGENCY**

**WASHINGTON, D.C. 20460**

**November 17, 2005**

> **OFFICE OF**
>
> **PREVENTION, PESTICIDES AND**
>
> **TOXIC SUBSTANCES**

**[MEMORANDUM]{.underline}**

**SUBJECT:** Usage Report Package in Support of Reregistration for the
Herbicide/desiccant Sodium Chlorate (073301)

**FROM:** Jenna Carter, Botanist

> Science Information & Analysis Branch

Biological and Economic Analysis Division (7503C)

**THRU:** Steve Jarboe/Rafael A. Prieto, Team Leaders

> Science Information & Analysis Branch
>
> Biological and Economic Analysis Division (7503C)

**TO:** Jacqueline Guerry, CRM

Reregistration Review Branch III

Special Review and Reregistration Division (7509C)

**Reviewer**: Jihad Alsadek

Attached is a usage report for the chemical sodium chlorate. The report
included in this package is electronically transmitted to Reviewers or
Team Members in the Office of Pesticide Programs (OPP) in support of the
Reregistration and/or Registration process and designed to help in the
scientific assessments of this chemical. This report is written in MS
Word, so it is advised to open or save it, to view or print from the
appropriate program.

For questions, comments and other usage or label use information
requests, please contact the name(s) listed on the memorandum header,
the **OPP Usage and Label Use Team** (our group e-mail address in Lotus
Notes), or some of its members: Jihad Alsadek (308-8140), Jenna Carter
(308-8370), Steve Jarboe (308-8105), Sharlita Harris (308-8147), or
Rafael Prieto (308-8152). You can also complete the feedback form at
your convenience. The Usage and Label Use Team (ULUT) looks forward to
hearing from you.

The **Usage** report(s) electronically-transmitted through Lotus Notes
links include:

Updated SLUA

**[Sodium Chlorate (073301)]{.underline}**

Screening-level Usage Analysis (SLUA)

**Date: November 15, 2005**

**What is a** **Screening Level Usage Analysis (SLUA)?**

-   Available estimates of pesticide usage data for a particular active
    ingredient that is used on **agricultural** crops in the United
    States.

**What does it contain?**

-   Pesticide usage data for a **single** active ingredient only.

-   Agricultural use sites (crops) that the pesticide is *reported* to
    be used on.

-   Available pesticide usage information (i.e., does not include all of
    the United States).

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-   Annual percent of crop treated **(average** **&** **maximum)** for
    each agricultural crop.

-   Average annual pounds of the pesticide applied for each agricultural
    crop (i.e., for the states surveyed, not for the entire United
    States).

**What assumptions can I make about the reported data?**

-   **Average pounds of active ingredient applied** - Values are
    calculated by merging pesticide usage data sources together;
    averaging by year, averaging across all years, & then rounding.
    ***Note:*** *If the estimated value is less than 500, then that
    value is labeled \<500. Estimated values between 500 & \<1,000,000
    are rounded to 1 significant digit. Estimated values of 1,000,000 or
    greater are rounded to 2 significant digits.)*

-   **Average percent of crop treated** - Values are calculated by
    merging data sources together; averaging by year, averaging across
    all years, & rounding to the nearest multiple of 5. ***Note:** If
    the estimated value is less than 1, then the value is labeled \<1.*

-   **Maximum percent of crop treated** - Value is the single maximum
    value reported across all data sources, across all years, & rounded
    up to the nearest multiple of 5. ***Note:** If the estimated value
    is less than 2.5, then the value is labeled \<2.5.*

**What are the data sources used?**

-   **USDA-NASS** (United States Department of Agriculture's National
    Agricultural Statistics Service) -- pesticide usage data from 1999
    to 2004.

-   **NCFAP** (National Center for Food and Agricultural Policy) --
    pesticide usage data from 1997 and used ***only*** if data are not
    available from the other sources.

-   **Private Pesticide Market Research** -- pesticide usage data from
    1999 to 2004.

-   California DPR data can be requested separately.

**What are the data limitations?**

-   Additional registered uses may exist but are not included because
    the available surveys do not report usage (e.g., small acreage
    crops).

-   Lack of reported usage data for the pesticide on a crop **does not
    imply** zero usage.

-   Usage data on a particular site may be noted in data sources, but
    **not quantified**. In these instances, the site would not be
    reported in the SLUA.

-   Non-agricultural use sites (e.g., turf, post-harvest, mosquito
    control, etc.) are not reported in the SLUA. A separate request must
    be made to receive these estimates.

-   Some sites show some use, even though they are not on the label.
    This usage could be due to Section 18 requests, existing stocks of
    the chemical, data collection errors, experimental use permit (EUP),
    and/or because of an illegal use.

**Who do I contact for further information and/or questions on this
SLUA?**

-   Jenna Carter (703 308-8370)

-   Jihad Alsadek (703 308-8140)

**Monday, November 14, 2005 6:04**

**Screening Level Estimates of Agricultural Uses of Sodium Chlorate
(073301) Sorted Alphabetically**

**Crop Lbs. A.I. Percent Crop Ttd.**

**Avg. Max**.

1 Beans, Dry (NCFAP \'97) 90,000 5

2 Cotton 1,900,000 5 10

3 Peppers 3,000 \<1 \<2.5

4 Potatoes \<500 \<1 \<2.5

5 Rice 70,000 \<1 \<2.5

6 Safflower (NCFAP \'97) 6,000 \<1

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

All numbers rounded.

\'\<500\' indicates less than 500 pounds of active ingredient.

\'\<2.5\' indicates less than 2.5 percent of crop is treated.