### 1 OFFICE OF CHEMICAL SAFETY AND POLLUTION PREVENTION **UNITED ST AT**  **ES ENVIRONMENT AL**  **PROTECTION A GENCY** 

WA SHINGTON, D.C. 20460



### MEMORANDUM **DATE:** October 12 , 2012 **SUBJECT:** Tier 1 D rinking Waters Analy sis for the Proposed New Uses of Sodium 1
-

Naphthalene
- acetate, and Ethyl 1
- Naphthaleneacetate, on Rambutan, Avocado, Mamey

Sapote and Mango , and Inclusion of Pome Fruits Group 11
- 10 ( **PC Codes 056002,**  **05600 7**  **, 05600 8**  **; DP Barcode D399622**  ) **TO:** Rosemary Kearns , Risk Manager Reviewer Tony Kish, Risk Manager #22 Cy nthia Giles
- Parker, Chief Fungicide Branch Laura Nollen, Risk Manager Reviewer Barbara Madden, Risk Manager, Risk Manager # 05 Luis Sugui yam a , Acting Chief Risk Integration, Minor Use and Emergency Response Branch Registration Division (7505P) **AND:** Sue Hummel , Risk Assessor

Thurston Morton, Dietary Assessor Elissa Reaves , Chief Risk Assessment Branch IV Health Effects Division (7509P) **FROM:** José L . Meléndez, Chemist

Environmental Risk Branch V Environmental Fate and Effects Division (7507P) **APPROVED BY:** Mah T. Shamim, Ph.D., Chief

Environmental Risk Branch V Environmental Fate and Effects Division (7507P) This memo presents the Tier I Estimated Surface Drinking Water Concentrations and Estimated Ground Drinking Water Concentrations (EDWCs) for 1
- naphthaleneacetic acid and its associated compounds sodium 1
- naphthaleneacet ate (Na
- NAA) and ethyl 1
- naphthaleneacet ate ( EE
-NAA) ,

### 2 calculated using the Tier 1 aquatic models FIRST and SCI
- GROW, respectively , for use in the human health risk assessment. The Interregional Research Project No. 4 (IR
- 4) and the registrant, AMVAC Chemical Corporation, petitioned a toleran ce exemption for the above mentioned chemicals for the products Tre
- Hold® 

### Sprout Inhibitor A
- 112, and Fruitone ® 

### L. The Environmental Fate and Effects Division (EFED) has reviewed the proposed new uses on r ambutan, avocado, mamey sapote and m ango at a maximum seasonal rate of 0. 22 lb a.e/A and 0.11 lb a.e. for rambutan
. 1 

### Based on an inspection of the new uses of NAA related compounds , it was found that the crop olives still represents the scenario with the highest exposure and consequently the hi ghest EDWCs (with an application rate of 0.33 lb a.e./A/ application in a single application per season ; DP Barcode D 387171 ). Therefore, the drinking waters assessment results do not change from the previous ones. The previous DWA has the nomenclature and structures of NAA and its associated compounds. For a summary of the results, see **Table 1**
. Should it be required b y HED, the EFED may

explore whether additional refinements of the assessment can be developed or higher tier anal y sis may be performed. Should any questions arise related to this DWA, please contact EFED as soon as possible. **Table 1. Maximum Tier I Estimated Drinking Water Concentrations (EDWCs) for drinking water assessment based on a**  **irblast application of 1**  **- napht**  **halene acetic acid and/or related compounds (collectively known as naphthalene acetates)**  **on olives DRINKING WATER SOURCE**  **(MODEL USED) USE (rate modeled per crop cycle)**  **MAXIMUM ESTIMATED DRINKING WATER CONCENTRATION (EDWC) ( ppb)**  Groundwater (SCI
- GROW) Olives (0. 33 lb a. e ./A) Ac ute and Chronic 0.0226 Surface water (FIRST) Olives (0. 33 lb a. e ./A) Ac ute 22.3 Olives (0. 33 lb a. e ./A) Chronic 2.99 

### Identification of specific data gaps : Very little environmental fate data were available for these compounds. Quantitative structure activity relationships (QSAR) and limited available data were used to derive some of the input parameters for the models. The major uncertainties with respect to this assessment are related to the absence of measured values for fate parameters. Furthermore, there is lack of information about possible degradates of NAA. **Use Characterization** A summary

table of all use patterns for NAA is provided in **Table 2**
. The proposed new uses are shaded blue , while the modeled use is **bolded and underlined** 
.

1 The abbreviation a.e. refers to acid equivalents ( i.e. , lbs of NAA , its salts and ester , expressed as lbs of NAA).

### 3 **Table 2 . Summary use information for naphthalene acetates, based on the 2007 revision of the RED,**  **the label for Rejuvenate Seed Treatment 2**  **, and the proposed labels for Tre -**  **Hold ®**  **Sprout Inhibitor A** **** **112 3**  **, and Fruitone ®**  **L 4**  **. The proposed new uses are shaded blue**  **. The modeled use is**  **bolded and**  **underlined .**  **USE SINGLE**  **APP. RATE (lb. a.e./A)**  **NUMBER**

**OF APPS. SEASONAL** 

**APP. RATE (lb**  **. a. e**  **./A) INTERVAL** 

**BETWEEN APP**  **S . (days)**  **APP.**

**METHOD** ***** **INCORP.**

**DEPTH (inches)**  Rambutan 0.11 1 0. 11 ## 5 T 0 Avocado, mamey sapote, mango 0.11 2 0.22 45 G, A, B 0 CG 11
- 10 Pome fruits: Apples, pears ****** , azarole, crabapple, loquat, mayhaw, medlar , Asian pear, quince, Chinese quince, Japanese quince, Japanese quince, tejocote and cultivars, varieties and/or hybrids of these 0.11 3 0.3 3 5 G, A, SD 0

Citrus (mandarin, oranges, tangelos, tangerines, and non
-bearing), cherries, some non
-bearing fruit and nut trees, ornamental plants (herbaceous, non
- flowering trees, woody shrubs and vines), shade trees, and residential fruit, and ornamental trees 0.11 3 0.33 5 G, A, SD 0

**Olives** 0.33 1 0.33 N/A AB 0 Potato seed pieces 0.0004 1 0.0004 N/A ST 3 ******* ***** a.e . = acid equivalents; N/A = not applicable; G = ground; A = aerial; SD = dip or soil drench; ST = seed treatment; AB = airbla st; B = brush, sponge or paint roller (to individual trees); T = treat rambutan panicles spraying a solution to runoff. **Apples an d pears are already approved uses. * ****** Shallowest depth of planting potatoes was obtained from the following source, accessed 08/27/2012: http://www.cals.uidaho.edu/potatoes/Research&Extension/Topic/Seed&Planting/EffectsOfRemovingSeedPieces&PlantingDepthOnP otatoYield
- 99.pdf (William H. Bohl and Stephen L. Love. 1999. Affects of Removing Seed Pieces and Planting Depth on Potato Yield). Furthermore, the following site states that, “Generally the center of the seed piece should be planted 2 to 4 inches below field level and covered with 2 to 3 inches of soil.” (Refer to http://www.ag.ndsu.edu/pubs/plantsci/rowcrops/ae1040w.htm , the site was accessed 08/27/2012. ) ##Even though the label is not clear on what is the application rate per acre, it appears to 0.11 lb a.e./A, similar to other crops.

2 Rejuvenate Seed Treatment (EPA Reg. No. 87320
- 2) contains 6.25% K
-NAA or 0.44 lb NAA a.e./gallon. 3 Tre
- Hold ® Sprout Inhibitor A
- 112 (EPA Reg. No. 5481
- 429) contains 15.1% EE
-NAA or 1 lb Na
-NAA a.e./gallon. 4 Fruitone L ® (EPA Reg. No. 5481
- 541) contains 3.5% Na
-NAA or 3.1% NAA a.e.