1

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 
2

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 A7

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.