1 OFFICE OF CHEMICAL SAFETY AND POLLUTION PREVENTION **UNITED STA TES ENVIRONMENTA**  **L PROTECTION A GENCY** 

WA SHINGTON, D.C. 20460
September 20 , 2012 **PC Code: 129131**  **MEMORANDUM DP Barcode:**  **404840 SUBJECT**  **: Fenpyroximate**  **:** Drinking Water Exposure Assessment for Proposed New Use s

on Stone Fruits (Crop Group 12

- 12), Tuberous and Cor m 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 (7505 P) Driss Benmhend, Product Manager Mark Suarez, Team Leader, RM Team 13 IB /RD (7505 P) The Environmental Fate and Effects Division (EFED) has completed its drinking water exposure assessment for the proposed new use s of fenpy roximate on stone frui ts (Crop Group 12
- 12), tuberous and corm vegetables (Crop Subgroup 1C), and small vine climbing fruits (Crop Subgroup 13

- 07F)
. Proposed maximum use pattern s 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 previousl y calculated EDWCs were ba sed 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

- for mat assessment (repeated in **Table 2**  ) remain unchanged for2

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 MethomylUse Sites. U.S.Environmental Protection Agency , Office of Prevention, Pesticides, and Toxic Substances, Biological and Economic Anal ys is Division. Memorandum to M. Panger, Environmental Fate and Effects Division. Feb. 28, 2007. USEPA . 2012. Fenp yroximate: 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. M emorandum to the Health Effects Division and Registration Division
. Jan. 2 3, 2012
.