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~** 

### DateIntroduction
Thi s document amends th e Final Work Plan (FWP) for the registration review ofterbacil. Since the pub li cation of the Se ptembe r 2011 Final Work Plan for the registration review ofterbaci l , the Age nc y has modified its li st of data necessary to support the registration review of terbacil. This document amends the Terbaci l FWP to remove those data requirements that are not needed at this time fo r the Terbacil Registration Review. Th e Agency ' s revision of the terbacil data requirements will not effect the timeline for the Terbacil Registration Review. Unless otherwise state d by the Agency , a ll other requirements and e l ements of the Agency ' s 20 11 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 impl ement ing the Registration Review program, pursuant to FIFRA section 3(g), and w ill review each registered pesticide every 15 years to determine whether it cont inues to meet the FIFRA standard for registration. Changes in science, public policy , and pesticide use practices will occur over time. The registration rev iew program is intended to make sure that , as the abili ty to assess risk evo lves as policies and practices change, all registered pesticides continue to meet that statutory standard. The pub lic 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 Metho d and Independent Laboratory Validation for Residues in Soil
• GLN 850.2100 Av ian Acute Oral Toxicity Test
The data requirement GLN 835.6100, Environmental C hemistry Analytical Method and Independent Laboratory Validation for Residues in Soil, was incorrectly li sted 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 su bmitted. 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 Tox icity , following issuance of the Terbacil FWP, the Agency further discussed this requirement. The Agency determined th at, while these data remain classified as a data gap, they would not substantially inform the eco l ogica l risk assessment and, therefo re , may be removed from the li st of data for the terbacil registration review. The revised list of data requirements for the Te rb acil Registration Review is below.Data Requirements for the Terbacil Registration Review Data Call
- In Data Requirement GLN PWP FWP Revised FWP Fina l Data Requirement

Anaerobic Aquatic Metabolism 835. 44 00 Required Removed Removed Removed Environmental Chemistry Ana lytical 835.6100 Required Required Removed Removed Method and Inde pendent Laboratory Validation for Residues in So il Avian Acute Oral Toxicity Test 850.2100 Required Req uired Removed Removed Environmental Chemistry Analytical 835.6200 Required Required Required Requ ired Method and Independent Laboratory Val idation for Residues in Water and Sediment Avian Reproduction Test 835.2300 Estuar ine/ Marine Invertebrate Life 850.1350 Cycle for Mysid Estuarine/Marin e F ish Early-life 850 .1 400 Stage Toxicity Test Terrestrial Plant Toxicity Test, Tier 850.4100 II : Seedling Emergence Terrestrial P lant Toxicity T est, 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 l ivestock) Residue Analytica l Method-Plants 860.1340 Multiresidue Method 860.1360 Crop Fie ld Tr i als (watermelon) 860.1500 P ropose d Tolerances (residues inion 860.1550 grass forage and hay) Field Accumulation in Rotational 860.1900 Crops (corn, wheat, and soy be an) Prenatal D evelopmental Toxicity (rat 870.3700 and rabbit) Reproductive and Fertility Effects 870.3800 Acute an d Subchronic neurotoxicity 870.6200 Immunotoxicity 870.7800