              OFFICE OF CHEMICAL SAFETY
AND POLLUTION PREVENTION
                 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                            WASHINGTON, D.C.  20460
                                       
                                       
                                       
                                       
                                       
                                April 16, 2012

                                                                PC Code: 129131
MEMORANDUM	DP Barcode: 392472

SUBJECT:	Fenpyroximate: Drinking Water Exposure Assessment for a Proposed New Use on Corn and Proposed Label Amendments for Uses on Mint, Melons, Fruiting Vegetables, and Citrus in Texas

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

THROUGH:  James Lin, Environmental Engineer
	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)

	Mark Suarez, Product Manager, RM Team 13
	Marion Johnson, Chief
	IB/RD (7505P)

      The Environmental Fate and Effects Division (EFED) has completed its drinking water exposure assessment for the proposed new use of fenpyroximate on corn (field, pop, silage, and seed; limited to States of California, Colorado, Hawaii, Kansas, New Mexico, Oklahoma, and Texas) and proposed label amendments to increase the maximum application rate per growing season for use on mint from 0.10 to 0.20 pounds of active ingredient per acre (lbs a.i./A) and to add aerial application as an option to uses on melons, fruiting vegetables, and citrus in Texas.  Preliminary exposure modeling indicates that none of these proposed actions will result in higher exposure estimates than were calculated in the previous drinking water assessment (DP barcode 391431; USEPA, 2012).  Therefore, the results of the previous assessment (repeated in Table 1 and the following paragraph) remain unchanged for this assessment.  For additional detail, please refer to the previous assessment.

Table 1.  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.

	A maximum screening exposure estimate in fish that may be consumed by humans was also calculated with the Provisional Cranberry Model and KABAM, at 30 mg/kg-bw (ww).
      
References

U.S. Environmental Protection Agency (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.
