Docket Number: EPA-HQ-OPP-2011-0054 

www .regulations.gov 

Terbacil Amended Final Work Plan 

For Registration Review 

Case No. 0039 

PC Code 012701 

Approved by: 

Richard P. Keigwin, Jr. 

Director, Pesticide Re-evaluation Division 

Lt>}a&J~ot~ 

Date 
Introduction 

This document amends the Final Work Plan (FWP) for the registration review ofterbacil. Since 

the publication of the September 2011 Final Work Plan for the registration review ofterbacil, the 

Agency has modified its list of data necessary to support the registration review of terbacil. This 

document amends the Terbacil FWP to remove those data requirements that are not needed at 

this time for the Terbacil Registration Review. The Agency's revision of the terbacil data 

requirements will not effect the timeline for the Terbacil Registration Review. Unless otherwise 

stated by the Agency, all other requirements and elements of the Agency's 2011 Terbacil FWP 

remain unchanged. Other supporting documents to the Terbacil Registration Review can be 

found in the terbacil docket (EPA-HQ-OPP-2011 -0054). 

The Agency is implementing the Registration Review program, pursuant to FIFRA section 3(g), 

and will review each registered pesticide every 15 years to determine whether it continues to 

meet the FIFRA standard for registration. Changes in science, public policy, and pesticide use 

practices will occur over time. The registration review program is intended to make sure that, as 

the ability to assess risk evolves as policies and practices change, all registered pesticides 

continue to meet that statutory standard. The public phase of registration review begins when the 

initial docket is opened for each case. Information on this program is provided at: 

http://www.epa.gov/oppsrrd 1 /registration review/. 

Changes to the Terbacil Final Work Plan 

Changes to Data Requirements 

The Agency is amending the Terbacil FWP by removing the following two data requirements: 

• GLN 835.6100 Environmental Chemistry Analytical Method and Independent 

Laboratory Validation for Residues in Soil 

• GLN 850.2100 Avian Acute Oral Toxicity Test 

The data requirement GLN 835.6100, Environmental Chemistry Analytical Method and 

Independent Laboratory Validation for Residues in Soil, was incorrectly listed in the FWP as a 

requirement. In its comments to the Terbacil Preliminary Work Plan, the technical registrant, 

Tessenderlo Kerley, Inc. (TKI) indicated that these data had previously been submitted. The 

Agency agreed and noted that the analytical method for terbacil in soil has been published to the 

Environmental Chemistry Methods index site 

(http://www.epa.gov/pesticides/methods/ecmindex.htm). 

Regarding GLN 850.2100, Avian Acute Oral Toxicity, following issuance of the Terbacil FWP, 

the Agency further discussed this requirement. The Agency determined that, while these data 

remain classified as a data gap, they would not substantially inform the ecological risk 

assessment and, therefore, may be removed from the list of data for the terbacil registration 

review. The revised list of data requirements for the Terbacil Registration Review is below. 
Data Requirements for the Terbacil Registration Review Data Call-In 

Data Requirement GLN PWP FWP Revised FWP Final Data Requirement 

Anaerobic Aquatic Metabolism 835.4400 Required Removed Removed Removed 

Environmental Chemistry Analytical 835.6100 Required Required Removed Removed 

Method and Independent Laboratory 

Validation for Residues in Soil 

Avian Acute Oral Toxicity Test 850.2100 Required Required Removed Removed 

Environmental Chemistry Analytical 835.6200 Required Required Required Required 

Method and Independent Laboratory 

Validation for Residues in Water and 

Sediment 

Avian Reproduction Test 835.2300 

Estuarine/Marine Invertebrate Life 850.1350 

Cycle for Mysid 

Estuarine/Marine Fish Early-life 850.1400 

Stage Toxicity Test 

Terrestrial Plant Toxicity Test, Tier 850.4100 

II: Seedling Emergence 

Terrestrial Plant Toxicity Test, Tier 850.4 150 

II: Vegetative Vigor 

Directions for Use (removal of the 860.1200 

restriction against the grazing or 

feeding of treated forage or hay to 

livestock) 

Residue Analytical Method-Plants 860.1340 

Multiresidue Method 860.1360 

Crop Field Trials (watermelon) 860.1500 

Proposed Tolerances (residues inion 860.1550 

grass forage and hay) 

Field Accumulation in Rotational 860.1900 

Crops (corn, wheat, and soybean) 

Prenatal Developmental Toxicity (rat 870.3700 

and rabbit) 

Reproductive and Fertility Effects 870.3800 

Acute and Subchronic neurotoxicity 870.6200 

Immunotoxicity 870.7800