Document ID: EPA-HQ-OPP-2012-0716-0007
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2013-06-17T04:00Z

OFFICE OF CHEMICAL SAFETY
AND POLLUTION PREVENTION
                 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                            WASHINGTON, D.C.  20460
                                       
                                       
                                       
                                       
                                       
                              September 20, 2012

                                                                PC Code: 129131
MEMORANDUM	DP Barcode: 404840

SUBJECT:	Fenpyroximate: Drinking Water Exposure Assessment for Proposed New Uses on Stone Fruits (Crop Group 12-12), Tuberous and Corm Vegetables (Crop Subgroup 1C), and Small Vine Climbing Fruits Except Kiwifruit (Crop Subgroup 13-07F)

FROM:	Greg Orrick, Environmental Scientist
	ERB2/EFED (7507P)

THROUGH:  R. David Jones, Ph.D., Senior Agronomist
	Brian Anderson, Chief
	ERB2/EFED (7507P)

TO:	George Kramer, Ph.D., Senior Chemist
	Dana Vogel, Chief
	RAB1/HED (7509P)

	Sidney Jackson, Risk Manager
	Barbara Madden, Team Leader, RM Team 5
	RIMUERB/RD (7505P)

	Driss Benmhend, Product Manager
	Mark Suarez, Team Leader, RM Team 13
	IB/RD (7505P)

      The Environmental Fate and Effects Division (EFED) has completed its drinking water exposure assessment for the proposed new uses of fenpyroximate on stone fruits (Crop Group 12-12), tuberous and corm vegetables (Crop Subgroup 1C), and small vine climbing fruits (Crop Subgroup 13-07F).  Proposed maximum use patterns for the proposed uses are in Table 1.  None of the proposed uses will result in higher estimated drinking water concentrations (EDWC) than were calculated in the previous long-format drinking water exposure assessment (DP barcode 391431; USEPA, 2012) because previously calculated EDWCs were based on the maximum use pattern for the current use on ornamentals (two applications per year, each at 0.343 lbs a.i./acre), which has higher single and annual application rates than those of the proposed uses.  Therefore, the EDWCs of the previous long-format assessment (repeated in Table 2) remain unchanged for this assessment.  For additional detail, please refer to the previous long-format assessment (USEPA, 2012).
      
Table 1. Proposed Fenpyroximate Use Patterns
                                      Use
                             Max. Single App. Rate
                                 (lbs a.i./A)
                      Max. Annual App. Rate (lbs a.i./A)
                               App. Interval (d)
                               Application Type
                       Additional Application Directions
                                 Stone fruits
                                     0.105
                                     0.21
                                      14
                                    Ground 
Do not apply within 75 feet of fish-bearing waters.  Do not use products with the same mode of action in consecutive applications.  
                         Tuberous and corm vegetables
                                     0.105
                                   0.21 [A]
                                       7
                               Aerial or ground
                                       
                  Small vine climbing fruits except kiwifruit
                                      0.1
                                     0.1 A
                              14 (not applicable)
                                    Ground
                                       
A	The labeled application rate limit is given per crop cycle or per growing season.  These crops have only one crop cycle or growing season per year (USEPA, 2007).  Therefore, these rate limits were used as annual rate limits.

Table 2.  Maximum Screening Drinking Water Exposure Estimates for Current and Proposed Fenpyroximate Uses [A]
Source (Tier: Model)
Use (Maximum Annual Rate)
                             Peak Exposure (μg/L)
                         Annual Mean Exposure (μg/L)
Surface water (Tier I: FIRST)
Ornamentals (0.69 lbs a.i./A)
                                      29
                                      1.9
Surface water (Tier I: Cranberry model)
Cranberries (0.20 lbs a.i./A)
                                      43
                                      8.6
Ground water (Tier I: SCI-GROW)
Ornamentals (0.69 lbs a.i./A)
                                    <=0.27
[A] Maximum values in bold.
      
References

 U.S. Environmental Protection Agency (USEPA). Kaul, M. 2007. Maximum Number of Crop Cycles per Year in California for Methomyl Use Sites. U.S.Environmental Protection Agency, Office of Prevention, Pesticides, and Toxic Substances, Biological and Economic Analysis Division. Memorandum to M. Panger, Environmental Fate and Effects Division. Feb. 28, 2007.

USEPA. 2012. Fenpyroximate: Drinking Water Exposure Assessment for Proposed New Uses on Snap Beans and Tropical Fruits including Avocado and a Proposed Outdoor Use on Cucumbers. DP barcode 391431. U.S. Environmental Protection Agency, Office of Chemical Safety and Pollution Prevention, Environmental Fate and Effects Division. Memorandum to the Health Effects Division and Registration Division. Jan. 23, 2012.