Docket Number EPA-HQ-OPP-20 14-067 1 

www.regulations.gov 

3-Methyl-2-cyclohexen-1-one 

(3 -MCH) 

PC Code: 219700 

Registration Review Final Work Plan 

June 201 5 

Case 6074 

Approved by: 

Biopesticides and 

Pollution Prevention Division 

Da te: 
INTRODUCTION 

This is the Environmental Protection Agency's (EPA or the Agency) Final Work Plan (FWP) for 

the registration review of 3-methyl-2-cyclohexen-1 -one (3-MCH). This work plan addresses 

public comments received concerning the Pre liminary Work Plan (PWP). which was posted in 

the 3-MCH registration review docket (EPA-HQ-OPP-20 14-0671 ). 3-MCH is currentl y 

registered in one manufacturing-use product (MP) and five end-use products (EPs) for outdoor, 

commerciaL and residential non-food use to prevent attacks from bark beetles on Douglas fir 

trees and spruce forests. 

The Agency is implementing the registration review program pursuant to Section 3(g) of the 

Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), 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 occur over time. The 

registration review program is intended to make sure that. as the ability to assess risk evolves and 

as policies and practices change, all registered pesticides continue to meet the statutory standard. 

The public phase of registration review begins when the initia l docket is opened for each case. 

Information on this program is provided on the Agency's website. 1 

The FWP begins with any updates since the PWP was issued. Next is a summary of substantive 

comments received during the public comment period for the PWP concerning anticipated data 

needs. expected risk assessments, or the estimated timeline identified in the PWP. and a 

summary of the Agency's responses to those comments. This section is followed by registration 

review planned data needs, risk assessments expected to be conducted, and the projected 

registration review time line for 3-MCH. Lastl y, there is a discussion of next steps. 

UPDATES SINCE THE PWP WAS ISSUED 

There are no additional updates on 3-MCI-1 since the issuance of the PWP. However, one 

typographical error has been identified in the PWP document. The statement on page 10: 

'"Nontarget organism data are not required for arthropod pheromones when applied up to a 

ma'\imum use rate of 160g acti ve ingredient per acre per year. ... , should read "150g active 

ingredient per year.,. 

SUMMARY OF COMMENTS AND AGENCY RESPONSES 

During the 60-day public comment period on the 3-MCH PWP, which opened on December 19. 

20 14. and closed on February 17,2015. the Agency did not receive any comments concerning 

this case. 

PLANNED DATA NEEDS 

The planned data needs have not changed from what was included in the 3-MCH PWP. 

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hnp://www.epa.gov/oppsrrd 1/regisrration review/ 

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RISK ASSESSMENTS FOR REGISTRATION REVIEW 

As stated in the PWP, no data gaps (anticipated data needs) for 3-MCH have been identified. The 

most recent comprehensive risk assessment for 3-MCH was completed on March 9. 1998. in 

support of the first biochemical registration of 3-MCH, which occurred on June 25. 1999 (U.S. 

EPA, 1998). A risk assessment was also completed on Apri I 17. 1978, in support of the first 

Experimental Use Permit (EUP) for 3-MCFJ, which was approved on August 27, 1984 (U.S. 

EPA, 1978). Because there are no data gaps for 3-MCH, and no additional information has been 

received on this biochemical since it was first registered, the Agency does not anticipate the need 

to conduct a new risk assessment during registration review. 

TIM ELINE 

EPA has created the fo llowing estimated timeline for the completion of the 3-MCH registration 

review in Table I. below. This projected timeline has not changed since the PWP. 

Table 1: Registration Review for 3-Methyl-2-cyclohexen-1-ooc (3-MCH) -

Projected Registration Review Timelinc 

Activities Estimated MonthN ear 

Opening the Docket 

Open Docket and 60-Day Public Comment Period December 2014 

Close Publ ic Comment Period February 2015 

Case Development 

Issue Final Work Plan June 2015 

Issue Data Call-in N/A 

Data Submission N/A 

Open 30-Day Publi c Comment Peri od for Draft Risk Assessments N/A 

Close Public Comment Period N/A 

Registration Review Decision 

Open 60-Day Public Comment Period for Proposed Registration Review September 20 15 

Decision 

Close Public Comment Period November 2015 

Final Decision March 20 16 

Estimated Total (years) 1 year and 3 months 

NEXT STEPS 

The Agency plans to issue a Proposed Registration Review Decision for this case in September. 

2015. At that time. a 60-day public comment period will be opened to accept comments on the 

Proposed Decision. 

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