### U

. S

. ENVIRONMENTAL PROTECTION AG EN CY 

### Washington , D

. C. 20460

OFFICE OF CHEM I CAL SAFETY AND POLLUT I ON PREVENTION



### PC Code: 138009 DP Barcode: 425591 , 425593, 425596, and 425599 Date: September 10, 2015 MEMORANDUM



### SUBJECT: Fluxapyroxad: Drinking Water Assessment for the Proposed Section 3 New Use Registrati on, Application to Citrus, Grass Forage , Fodder , Straw , and Hay , Grass for Seed, and Nongrass Animal Feed , including A lfalfa and Clover
TO: Dri ss Benmhend, Risk Manager Reviewer Shaja Joyner , Product Manager



### FROM: Rachel Holloman , Branch Chief Regi s tration Division (7505P)
Mohsen Sahafeyan , Dietar y Assessor Donna Davis, Branch Chief Risk Assessment Branch VI Health Effects Division (7509 P)
Chuck Peck, Environmenta l Engineer**~** /7 ,//.,.., 

### 2015.09.10 Environmental Risk Branch IV l_f::£__iL

### ~ 

### 11 :23:58 -04'00' Environmental Fate and Effects Division (7507P)


### REVIEWED Jim Carleton , PhD , Senior Scientist 

### JAMES**~** 

### ..**~~.,,...u** BY: Env ironmental Ri sk Branch IV**~~~~:.:::.::,** Environmental Fate and Effects Di visio n (7507P) 

### CARLETON

### =~=~;**-oo,.** APPROVED J eanHolmes , DVM , MPHBranchChi ef

# o,/A-~**.** f/)d/J BY: Environmental Risk Branch IV /"' .....-- Environmental Fate and Effects Division (7507P)
The Environmental Fate and Effects Division (EFED) has reviewed the proposed Section 3 Label Amendment for fluxapyroxad (PC Code: 138009) for applications to citrus, grass forage , fodder, straw, and hay, grass for see d , and non
- g ras s anima l feed , including alfalfa and clover. The new uses are being proposed for the following products: Priaxor (Reg. No. 7969-311 ), lm brex (Reg. No. 7969-306), and Sercadis (Reg. No. 7969-309). 

### It s h ou ld be noted that Priaxor ® also contains the active in gre dient pyraclostrobin, which is no t bein g evaluated in this assessment. A separate DWA is being conducted for pyraclostrob in

.

Page I of 2The proposed rates fo r the variou s u ses are provided in 

### Tab le 1

. Except for turf , w hich has a maximum annual a ppli cat io n rate spec ifi e d o n th e labe l , EF E D ass um ed o n e grow ing season per yea r in the d eve lopment of the max imum annual use rate s. A dditi o nall y, the current uses for turf and r ice are provided in 

### Tab l e 1 , as th ese a re the u ses th at have driven previous drink ing water asse ss ments.

Ta b le I

. 

### r fi fl Maximum app 1c atio n rates or u xapyroxad new an d prev 1ou s 1 v assessed u ses Labe l Rates C r op Max S ingle Use Rate Max Number of Max Annua l Use R ate Obs a.iJA) Annlications per s eason (lb s a.iJA) C itru s 0.122 4 0.488 Grass forage , fo dd er , 0.089 3 0.267 and hay G rass for see d 0.089 3 0. 26 7 No ngrass anim a l feed , in c ludin g a l fa l fa and 0.089 3 0.267 clover Turf 0.23 4 0 .9 2 Rice 0.135 2 0.27


### Table 2 depicts the EDWCs that EFED has reco mme nd ed fo r use in previous OWAs 

### ( OP Barc ode 426700 , Ap ril I0 , 2015). As the ap pli cation rates fo r the new uses are equal to or below the applicati o n rates for the uses that generated the c urrent l y recommended EDWC s (turf and rice), the E DW Cs fo r the proposed appl ications are n ot expec ted to exceed the curre ntl y rec o mmend ed EDWC s and have not been modeled. EFE D recommend s th e u se of the grou nd water EDW Cs for turf in H E D ' s drinking water assessment for these new us es
. T able 2. R eco mm e nd ed esti mated**drink.in~** water conce ntration s (EDWC s) for flu xapy roxad new u ses DRINKI NG USE ( r ate modeled) MAXIMUM ES T IMATED DRI N KING WATE R WATER CONCENTRATION (EDWC) SOU R CE l -i n
- 1 0 year 1- in-10 yea r (M ODEL USE D) acute chronic (μg/L) (u!:!IL) Surface water Fo liar Ri ce 127 127 (T ier I Ri ce Model) (0 .1 35 lb s a.i./A x 2, RTI = 7 d ays) G r ou n dwater Aerial Foliar ( PRZM -GW ) (turf, 0.23 l bs a.i./A x 4, RT I = 1 4 203 188 days) Bold values are recommended fo r use in OW A.

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