              OFFICE OF CHEMICAL SAFETY
AND POLLUTION PREVENTION
                 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                            WASHINGTON, D.C.  20460
              OFFICE OF CHEMICAL SAFETY
AND POLLUTION PREVENTION
                 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                            WASHINGTON, D.C.  20460
                                        
                                       
                                       
                                       
                                       
                                       
                                October 3, 2016
                                       
	PC Code: 027412 
MEMORANDUM	DP Barcode: 433333

SUBJECT:	Fluopicolide: Drinking Water Exposure Assessment for Proposed Section 3 New Uses on Basil, Succulent Beans, Hops, Small Vine Climbing Subgroup 13-07F, Citrus Fruit Crop Group 10-10, and the Conversion of Fruiting Vegetable Crop Group 8-10

FROM:	Gregory Orrick, Environmental Scientist
	Environmental Risk Branch 1
	Environmental Fate and Effects Division (7507P)

THRU:    	Sujatha Sankula, Ph.D., Branch Chief
            Environmental Risk Branch 1
	Environmental Fate and Effects Division (7507P)

TO:		Lindsay Roe, Product Manager
		Cynthia Giles-Parker, Branch Chief
      Fungicide Branch
		Registration Division (7505P)

		Nancy Keller, Risk Manager
		Minor Use and Emergency Response Branch
		Registration Division (7505P)
      	
      Monique Perron, Risk Assessor
		Chris Olinger, Branch Chief
      Risk Assessment Branch 1
      Health Effects Division (7509P)

This memorandum is the Environmental Fate and Effects Division's (EFED) drinking water exposure assessment for the proposed Section 3 New Uses of fluopicolide on basil, succulent beans, hops, small vine climbing subgroup 13-07F, citrus fruit crop group 10-10, and the conversion of the fruiting vegetable crop group 8-10.  Proposed application rates for all proposed uses are 0.125 lbs a.i./acre per single application and 0.375 lbs a.i./acre per year.  These application rates were assessed in the previous drinking water exposure assessment (DP 420746; USEPA 2014).  Therefore, for this assessment, maximum exposure estimates from the previous assessment are used and additional exposure modeling was not performed.

Maximum estimated drinking water concentrations (EDWC) from the previous assessment for fluopicolide and its degradate of concern, BAM, represented ground water sourced exposure, which is not sensitive to the type of use site.  Therefore, maximum exposure estimates from the previous assessment are expected to be representative of the proposed new uses.  The maximum EDWCs are 109 ug/L (acute) and 103 ug/L (chronic) for fluopicolide and 31 ug/L (acute and chronic) for BAM.

Drinking water exposure from use of fluopicolide will be reassessed in support of Registration Review in 2017.  At that time, exposure estimates may be recalculated to ensure that they represent the most recent data, exposure models, and assessment methodologies.  However, the previous assessment, written recently in 2014, is expected to remain representative at this time.
