
                 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                            WASHINGTON, D.C.  20460
                                                                      OFFICE OF
                                                            CHEMICAL SAFETY AND
\* MERGEFORMAT
                                                           POLLUTION PREVENTION

MEMORANDUM

Date:	November 5, 2013

Subject:	Addendum. Linuron. Section 3 Human Health Risk Assessment for Proposed Use on Coriander, Dill, Horseradish, Parsley, Celeriac, Rhubarb, and Pea (Dry).
 
PC Code:  035506
DP Barcode:  D415741
Decision No.:  469722
Registration No.:  61842-23
Petition No.:  2E8083
Regulatory Action:  Section 3 Registration
Case No.:  0047
Risk Assessment Type:  Single Chemical Aggregate
TXR No.:  NA
CAS No.:  330-55-2
MRID No.:  NA
40 CFR:  §180.184

From:	Nancy Tsaur, Chemist
	Risk Assessment Branch 3
	Health Effects Division (7509P)

Through:	Christine Olinger, Branch Chief
	Risk Assessment Branch 3
	Health Effects Division (7509P)
	
To:	Laura Nollen, Risk Manager
	Risk Integration Minor Use and Emergency Response Branch
	Division (7505P)


This document provides a recommended revision to the tolerance expression for linuron.  





According to HED's Interim Guidance on Tolerance Expressions (S. Knizner, 05/27/2009), the tolerance expressions for linuron should be revised as follows:

Under 40 CFR §180.184(a) General:
   "Tolerances are established for residues of the herbicide linuron [3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea], including its metabolites and degradates, in or on the commodities in the table below.  Compliance with the tolerance levels specified below is to be determined by measuring only those linuron residues convertible to 3,4-dichloroaniline, calculated as the stoichiometric equivalent of linuron, in or on the commodity."

Under 40 CFR §180.184(b) Section 18 emergency exemptions:
   "Time-limited tolerances are established for residues of the herbicide linuron [3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea], including its metabolites and degradates, in or on the commodities in the table below, resulting from use of the pesticide pursuant to FIFRA section 18 emergency exemptions.  Compliance with the tolerance levels specified below is to be determined by measuring only those linuron residues convertible to 3,4-dichloroaniline, calculated as the stoichiometric equivalent of linuron, in or on the commodity.  The tolerance expires and is revoked on the date specified in the table.

Under 40 CFR §180.184(c) Tolerances with regional registrations:
   "Tolerances with regional registrations, as defined in §180.1(l), are established for residues of the herbicide linuron [3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea], including its metabolites and degradates, in or on the commodities in the table below.  Compliance with the tolerance levels specified below is to be determined by measuring only those linuron residues convertible to 3,4-dichloroaniline, calculated as the stoichiometric equivalent of linuron, in or on the commodity."

