UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

WASHINGTON D.C., 20460

OFFICE OF

CHEMICAL SAFETY AND

POLLUTION PREVENTION



### October 16, 2012

MEMORANDUM

SUBJECT:

TO:

FROM:

THROUGH: Drinking Water Assessment for Label Amendments (Roundup WeatherMAX®

EPA Reg. No. 524-537 and Roundup Ultra® EPA Reg. No. 524-475) for

Glyphosate Use on Oilseed Crops, Root and Tuber Crops, Pome Fruit Crops,

Citrus Fruit Crops, Fruiting Vegetable Crops, Berry and Small Fruit Crops, Bulb

Vegetables Crops. 

### PC Code: 417300; DP Barcode:**3~8549**



### Barbara Madden, Risk Manager 05

Andrew Ertman, Risk Manager Reviewer

Registration Division

. 

# lf.&;:A /O;f,(tz_

James A. 

### Hetrick Ph.D., Senior Science

# Adviso~ 

# a

Environmental Risk Branch 3 It> { 1lo / 1 7-



### Environmental Fate and 

### Effects Division (7507P) 

# /J ()

_ /).**~** 

# L

Rosanna

# Louie-Juzwiak,~ Process Leader Ut-;....-

# ~ 

# ';!(:

Dana Spatz, Branch Chie

·

## ~ 1 

# It 

# l

Environmental Risk Branch 3

## ~ " 1

,_ 

### Environmental Fate and Effects Division (7507P)



### Executive Summary

The IR.-4 Project is requesting to amend the Roundup WeatherMAX® EPA Reg. No. 524-537

and Roundup Ultra® EPA Reg. No. 524-475labels to add use on Oilseed Crops, Root and Tuber

Crops, Pome Fruit Crops, Citrus Fruit Crops, Fruiting Vegetable Crops, Berry mid Small

### F~it Crops, Bulb Vegetables Crops. A previous drinking water assessment evaluating direct aquatic

applications of glyphosate continue to produce the highest estimated drinking water

concentrations (EDWC). EFED, therefore, recommends using the modeling EECs from direct

water application of glyphosate to represent the most conservative concentrations of glyphosate

in surface source drinking water (D364549). The EDWCs for glyphosate in surface source water

are not expected to exceed 153.7 J.Lg/L for daily peak and 8.11J.Lg/L for the annual average. For

groundwater, the EDWC for glyphosate is not expected to exceed 2.03 J.Lg/L.

### 2 Summary of Previously Assessed Crop Uses

Drinking water assessments have been conducted for a number of different terrestrial crop,

terrestrial non -crop, and aquatic use patterns (D376484, D372055, D364549 ). The highest

EDWC for among glyphosate use s sites is the direct aquatic applications (D364549). The

EDWC s for glyphosate from direct aquatic applications are not expected to exceed 153.67 μg/L

for the daily peak and 8.11 μg/L for the annual average. Previous drinking water assessments for

various terrestrial crops and use sites showed that EDWCs for glyphosate applications of 5.96 to

7.95 lbs ae/A are less than the direct aquatic application EDWCs

. Because the proposed pome

fruit and citrus crop group uses are not well represented by the crops and use rates considered in

past drinking water exposure assessments, they were considered in this assessment to confirm

they produce lower EDWCs than the direct aquatic applications of glyphosate. The proposed

maximum annual application rates, expressed in pounds of acid equivalent per acre (lb ae/A) for

the proposed uses of glyphosate are shown in Table 1

.

Tabl e 1: Proposed Maximum Glyphosate Application Rates on IR

- 4 Supplemental

Labels of Roundup Weather MAX and Roundup Ultra

Crop Groups RoundupWeather MAX Roundup Ultra

lb ae/A

Root and Tuber Vegetable Crops 6 6

Pome Fruit Crops 7.9 7.9

Bulb Vegetable Crops 6 6

Berry and Small Fruit Crops 3.023* 6

Fruiting Vegetable Crops 6 6

Citrus Fruit Crops 8.21 8.25

Oilseed Crops 6 6

*- Spot treatment application rate is not specified on the label.



### Aquatic Exposure Modeling from Glyphosate Use on Pome Fruit and Citrus Crop Uses

Although the residues of concern in the food tolerance for glyphosate are parent and N- acetyl

glyphosate (CFR 40:158-189, 7/1/2010) 1 

### , the drinking water assessment is based solely on

parent glyphosate because N

- acetyl -glyphosate was n ot identified in environmental fate studies.



## Surface water modeling for the proposed glyphosate use rates on pome fruit and citrus were

conducted using environmental fate data shown in Table 3 . Surface water modeling was

conducted using PRZM (3.1.2.2)/EXAMS (2.98.04). The initial application date was May

1. The estimated glyphosate concentrations in surface water were not corrected using

percent cropped area because glyphosate is registered on non- agricultural use sites. The

application rate, number, and interval for glyphosate use on pome fruit and citrus are shown

in Table 4 . Output files for PRZM/EXAMS model simulations are shown in Appendix A.

1 U.S. Government. 2010. Code of Federal Regulation (CFR) 40:Part 180.364:Protection of the Environment. U,S,

Government Printing Office, Washington, D.C.

### 3 Table 3 . PRZM / EXAMS and SCI

- GROW Modeling Inputs for Glyphosate for Pome Fruit

Crops and Citrus Crops

PARAMETER VALUE SOURCE

Spray Drift Fraction 0.064 Default ground spray application

Aerobic Soil Metabolism Half

- life

(days) 5.4 days MRID 42372501, 44320645

Organic Carbon Partition Coefficient

(K

oc 

### ) (mL/ g

oc 

### ) 3,100 MRID 44320646

Aerobic Aquatic

Half

- Life (days) 14.1 days MRID 41723601

Anaerobic Aquatic

half- life (days) 208 days MRID 41723701

Aqueous Photolysis

half- life (days) Stable MRID 41689101, 44320643

Hydrolysis

half- life (days) Stable MRID 00108192, 44320642

Molecular Weight (g/mole) 170.8

Henry’s Law constant

(atm

- m 3 

### /mol) 2.0725x10 -14



### Water Solubility @ 25°C

(mg/L) 12,000

Vapor Pressure (torr) 9.75x10 -10



### Table 4 : Application Information for Glyphosate Use on Pome Fruit and Citrus

Crop Application Rate

(lb ae/A) Number of

Applications Application

Interval

(days) Annual Application

Rate

(lb ae/A)

Pome Fruit 3.95 2 30 7.9

Citrus a 

### 0.78

- 1.46

- 2.25

- 3.71 4 30 8.2

a- Sequential application rates applied at 30 day interval.



### Surface Water Modeling for Pome Fruit and Citrus

The EDWCs from the proposed glyphosate use on pome fruit and citrus use are not expected to

exceed 51 μg/L for the 1 in 10 year daily peak, 2.60 μg/L for the 1 in 10 year annual average,

and 1.87 μg/L for the 30 year annual average. Glyphosate EDWC from citrus and pome fruit use

are shown in Table 5

.

### 4 Table 5: Tier II Estimated Drinking Water Concentrations of Glyphosate in Surface Source Water

for IR

- 4 Uses on Pome Fruit and Citrus

Crop Scenario 1 in 10 year 30 year Average Peak Annual Average

μg/L

Apple PA apple 23.56 3.72 2.50

NC apple 51.65 5.89 4.06

OR apple 14.03 2.44 2.20

Citrus FL citrus 23.85 3.41 2.08

CA citrus 10.71 1.61 1.30



### Ground Water Modeling

SCI -GROW (Version 2.3) and PRZM GW(Version 1.0) modeling were conducted using an

application rate of 8.21 lb ae/A. The predicted glyphosate concentrations in groundwater are not

expected to exceed 0.0378 μg/L. The PRZM GW (Version 1.0) model predicts that glyphosate

does not move into groundwater at a depth of 30 feet. The output file for SCI-GROW modeling

is sho wn in Appendix A.

Monitoring Data

The highest concentration of glyphosate in monitoring data are 73 μg/L for the daily peak in

surface water, 4.9 μg/L for the annual average in surface water, and 2.30 μg/L in groundwater.

Although there are monitoring data for subsurface drains showing high concentrations of

glyphosate (290 μg/L ) and AMPA (400 μg/L ), sub

- surface drain water is not representative of

surface or groundwater source drinking water (Coup et al., 2011) 2



### . Therefore, these

concentrations are n ot considered in the drinking water exposure assessment.

Surface Water

Occurrence data for glyphosate was obtained from the NAWQA data warehouse. (2/10/12)

( Table 6 ).

Table 6: Glyphosate Concentrations in NAWQA Surface Water Samples

(Downloaded from NAWQA Data Warehouse 2/10/12)

Residue Number of

Samples Detection

Frequency

(%) Number of

of

Site*Years Maximum

Conc Maximum

Annual Average

Conc

ug/L

Glyphosate 1417 54.97 149 73 4.95

2 Coupe, R.H., S.J.Kalkhoff, P.D. Capel, and C. Gregoire. 2011. Fate and transport of glyphosate and

aminomethylphospho nic acid in surface water of agricultural basins. Pest Manag Sci, 68:16

- 30.

### 5 Ground Water

Occurrence data for glyphosate in ground water were obtained from the NAWQA data

warehouse. (10/04/12) ( Table 7 ). Additionally, ground water concentration s of glyphosate were

obtained from Coup et al., 2011 (Table 8). Monitoring data for subsurface drains showing high

conce ntrations of glyphosate (290 μg/L ) and AMPA (400 μg/L ).

Table 7: Glyphosate Concentrations in NAWQA Ground Water Samples

(Downloaded from NAWQA Data Warehouse 10/4/12 )

Residue Number

of

Samples Detection

Frequency

(%) Years Maximum

Conc Maximum Annual

Average Conc

ug/L

Glyphosate 44 100 2001

- 2009 2.03 0.845

Table 8: Glyphosate Concentrations in Subsurface

Drains from Coupe et al., 2011.

Residue Maximum Daily

Concentration

(μg/L)

Glyphosate 290

AMPA 400

### 6 APPENDIX

NCAPPLE

stored as NCapp.out

Chemical: glyphosate

PRZM environment: NCappleSTD.txt modified Tueday, 29 May 2007 at 13:58:16

EXAMS environment: ir298.exv modified Tueday, 26 August 2008 at 06:14:08

Metfile: w03812.dvf modified Tueday, 26 August 2008 at 06:14:10

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1965 17.7 15.81 12.65 9.232 7.476 2.519

1966 25.55 22.97 17.13 12.4 10.26 4.039

1967 39.31 35.08 24.03 14.63 12.15 4.978

1968 24.93 22.2 17.4 10.96 8.995 3.901

1969 14.01 12.64 8.974 7.238 5.704 2.485

1970 12.87 11.49 7.732 5.998 4.68 1.864

1971 15.06 13.46 9.355 8.149 6.642 2.426

1972 41.75 37.57 26.37 21.7 18.48 6.597

1973 29.53 26.56 20.05 16.92 13.46 5.475

1974 30.02 26.91 18.66 13.83 10.94 4.341

1975 50.5 4 4.98 29.48 18.3 14.57 5.574

1976 21.27 19.39 14.38 11.68 9.709 4.22

1977 15.02 13.45 9.666 7.935 6.357 2.721

1978 15.08 13.5 10.78 8.917 6.915 2.681

1979 21.62 19.3 13.79 9.014 7.197 2.764

1980 33.98 30.89 23.99 15.65 12.46 4.473

1981 54.32 48.97 31.81 17.21 13.77 5.363

1982 15.41 13.74 11.44 8.326 6.799 3.155

1983 15.66 13.96 11.06 7.973 6.289 2.47

1984 30.83 28.05 20.15 15.06 12.13 4.394

1985 13.39 12.01 7.955 6.399 5.133 2.362

1986 14. 67 13. 05 8.748 6.565 5.048 2.058

1987 149 131 83.18 42.9 31.56 10.82

1988 15.34 13.91 9.653 8.3 6.893 4.228

1989 33.94 30.64 21.29 19.03 15.24 5.594

1990 18.01 16.24 13.4 10.36 9.048 3.99

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.037037037037037 149 131 83.18 42.9 31.56 10.82

0.0740740740740741 54.32 48 .97 31.81 21.7 18.48 6.597

0.111111111111111 50.5 44.98 29.48 19.03 15.24 5.594

0.148148148148148 41.75 37.57 26.37 18.3 14.57 5.574

0.185185185185185 39.31 35.08 24.03 17.21 13.77 5.475

0.222222222222222 33.98 30.89 23.99 16.92 13.46 5.363

0.259259259259259 33.94 30.64 21.29 15.65 12.46 4.978

0.296296296296296 30.83 28.05 20.15 15.06 12.15 4.473

0.333333333333333 30.02 26.91 20.05 14.63 12.13 4.394

0.37037037037037 29.53 26.56 18.66 13.83 10.94 4.341

0.407407407407407 25.55 22.97 17.4 12.4 10.26 4.228

0.444444444444444 24.93 22.2 17.13 11.68 9.709 4.22

0.481481481481481 21.62 19.39 14.38 10.96 9.048 4.039

### 7 0.518518518518518 21.27 19.3 13.79 10.36 8.995 3.99

0.555555555555556 18.01 16.24 13.4 9.232 7.476 3.901

0.592592592592593 17.7 15.81 12.65 9.014 7.197 3.155

0.62962962962963 15.66 13.96 11.44 8.917 6.915 2.764

0.666666666666667 15.41 13.91 11.06 8.326 6.893 2.721

0.703703703703704 15.34 13.74 10.78 8.3 6.799 2.681

0.740740740740741 15.08 13.5 9.666 8.149 6.642 2.519

0.777777777777778 15.06 13.46 9.653 7.97 3 6.357 2.485

0.814814814814815 15.02 13.45 9.355 7.935 6.289 2.47

0.851851851851852 14.67 13.05 8.974 7.238 5.704 2.426

0.888888888888889 14.01 12.64 8.748 6.565 5.133 2.362

0.925925925925926 13.39 12.01 7.955 6.399 5.048 2.058

0.962962962962963 12.87 11.49 7.732 5.998 4.68 1.864

0.1 51.646 46.177 30.179 19.831 16.212 5.8949

Average of yearly averages: 4.05738461538462

Inputs generated by pe5.pl

- Novemeber 2006

Data used for this run:

Output File: NCapp

Metfile: w03812.dvf

PRZM scenario: NCappl eSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: glyphosate

Description Variable Name Value Units Comments

Molecular weight mwt 170.8 g/mol

Henry's Law Const. henry 2.07E

- 14 atm

- m^3/mol

Vapor Pressure vapr 9.75E

- 10 torr

Solubility sol 12000 mg/L

Kd Kd mg/L

Koc Koc 3100 mg/L

Photolysis half

- life kdp days Half

- life

Aerobic Aquatic Metabolism kbacw 14.1 days Halfife

Anaerobic Aquatic Metabolism kbacs 208 days Halfife

Aerobic Soil Metabolism as m 5 .4 days Halfife

Hydrolysis: pH 7 days Half

- life

Metho d: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI cm

Application Rate: TAPP 4.424 kg/ha

Application Efficiency: APPEFF 0.99 fraction

Spray Drift DRFT 0.064 fraction of application rate applied to pond

Application Date Date 1-5 dd/mm or dd/mmm or dd

- mm or dd

- mmm

Interval 1 interval 30 days Set to 0 or delete line for single app.

app. rate 1 apprate 4.424 kg/ha

Record 17: FILTRA

IPSCND 1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNO FF total none, monthly or total(average of entire run)

### 8 PA APPLE

stored as PAapp.out

Chemical: glyphosate

PRZM environment: PAappleSTD_V2.txt modified Tueday, 20 May 2008 at 13:00:22

EXAMS environment: ir298.exv modified Tueday, 26 August 2008 at 06:14: 08

Metfile: w14751.dvf modified Tueday, 26 August 2008 at 06:15:00

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 12.69 11.32 7.237 5.623 4.468 1.487

1962 12.66 11.24 7.82 6.001 4.669 1.773

1963 12.96 11.57 7.425 5.829 4.46 1.713

1964 14.87 13.17 10.14 6.984 5.55 2.118

1965 12.69 11.24 7.616 5.895 4.539 1.808

1966 12.84 11.36 7.018 5.615 4.208 1.972

1967 14.64 13.09 8.625 7.235 6.232 2.594

1968 18.16 16.25 10.82 7.686 5.974 2.358

1969 12.82 11.39 7.237 5.744 4.527 1.915

1970 12.7 11.29 7.846 6.182 4.946 1.895

1971 13.74 12.23 7.962 6.502 4.943 1.885

1972 31.32 27.9 18.35 11.51 9.932 3.754

1973 15.77 14.11 9.135 7.206 5.589 2.482

1974 14.48 12.93 8.435 7.245 5.659 2.168

1975 15.44 13.76 11.11 9.098 7.257 2.757

1976 19.82 17.41 11.42 8.011 6.285 2.568

1977 12.85 11.47 7.55 5.996 4.704 1.932

1978 14.88 13.29 8.607 7.394 6.23 2.364

1979 13.96 12.49 8.224 6.49 5.489 2.236

1980 16.24 14.55 9.956 8.233 6.34 2.403

1981 12.99 11.57 7.489 6.009 4.682 1.9

1982 53.04 47.96 35.89 20.6 5 15.73 5.958

1983 15. 91 14. 37 9.696 8.09 6.363 3.235

1984 15.43 13.83 10.87 8.574 7.331 2.928

1985 21.36 19.38 13.84 10.97 8.584 3.379

1986 13.79 12.3 7.972 6.417 5.03 2.233

1987 13.27 11.78 7.805 6.929 5.74 2.265

1988 13.81 12.32 7.959 6.594 5.254 2.238

1989 23.8 22.26 16.75 13.4 10.56 3.933

1990 16.21 14.53 9.564 7.99 6.453 2.81

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 53.04 47.96 35.89 20.65 15.73 5.958

0.0645161290322581 31.32 27.9 18.35 13.4 10.56 3.933

0.0967741935483871 23.8 22.26 16.75 11.51 9.932 3.754

0.129032258064516 21.36 19.38 13.84 10.97 8.584 3.379

0.161290322580645 19.82 17.41 11.42 9.098 7.331 3.235

0.193548387096774 18.16 16.25 11.11 8.574 7.257 2.928

0.225806451612903 16.24 14.55 10.87 8.23 3 6.453 2.81

0.258064516129032 16.21 14.53 10.82 8.09 6.363 2.757

0.290322580645161 15.91 14.37 10.14 8.011 6.34 2.594

0.32258064516129 15.77 14.11 9.956 7.99 6.285 2.568

0.354838709677419 15.44 13.83 9.696 7.686 6.232 2.482

0.387096774193548 15.43 13.76 9 .564 7.394 6.23 2.403

0.419354838709677 14.88 13.29 9.135 7.245 5.974 2.364

### 9 0.451612903225806 14.87 13.17 8.625 7.235 5.74 2.358

0.483870967741936 14.64 13.09 8.607 7.206 5.659 2.265

0.516129032258065 14.48 12.93 8.435 6.984 5.589 2.238

0.548387096774194 1 3.96 12.49 8.224 6.929 5.55 2.236

0.580645161290323 13.81 12.32 7.972 6.594 5.489 2.233

0.612903225806452 13.79 12.3 7.962 6.502 5.254 2.168

0.645161290322581 13.74 12.23 7.959 6.49 5.03 2.118

0.67741935483871 13.27 11.78 7.846 6.417 4.946 1.972

0.709677419354839 12.99 11.57 7.82 6.182 4.943 1.932

0.741935483870968 12.96 11.57 7.805 6.009 4.704 1.915

0.774193548387097 12.85 11.47 7.616 6.001 4.682 1.9

0.806451612903226 12.84 11.39 7.55 5.996 4.669 1.895

0.838709677419355 12.82 11.36 7.489 5.895 4.539 1.885

0.870967741935484 12.7 11.32 7.425 5.829 4.527 1.808

0.903225806451613 12.69 11.29 7.237 5.744 4.468 1.773

0.935483870967742 12.69 11.24 7.237 5.623 4.46 1.713

0.967741935483871 12.66 11.24 7.018 5.615 4.208 1.487

0.1 23.556 21.972 16.459 11.456 9.7972 3.7165

Average of yearly averages: 2.50203333333333

Inputs generated by pe5.pl

- Novemeber 2006

Data used for this run:

Output File: PAapp

Metfile: w14751.dvf

PRZM scenario: PAappleSTD_V2.txt

EXAMS environment file: ir298.exv

Chemical Name: glyphosate

Description Variable Name Value Units Comments

Molecular weight mwt 170.8 g/mol

Henry's Law Const. henry 2.07E

- 14 atm

- m^3/mol

Vapor Pressure vapr 9.75E

- 10 torr

Solubility so l 1200 0 mg/L

Kd Kd mg/L

Koc Koc 3100 mg/L

Photolysis half

- life kdp days Half

- lif e

Aerobic Aquatic Metabolism kbacw 14.1 days Halfife

Anaerobic Aquatic Metabolism kbacs 208 days Halfife

Aerobic Soil Metabolism asm 5.4 days Halfife

Hydrolysis: pH 7 days Half

- life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI cm

Application Rate: TAPP 4.424 kg/ha

Application Efficiency: APPEFF 0.99 fraction

Spray Drift DRFT 0.064 fraction of application rate applied to pond

Application Date Date 1-5 dd/mm or dd/mmm or dd

- mm or dd

- mmm

Interval 1 interval 30 days Set to 0 or delete line for single app.

app. rate 1 apprate 4.424 kg/ha

Record 17: FILTRA

IPSCND 1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

### 10 Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

OR APPL E

stored as ORapp.out

Chemical: glyphosate

PRZM environment: ORappleSTD.txt modified Tueday, 29 May 2007 at 14:00:08

EXAMS environment: ir298.exv modified Tueday, 26 August 2008 at 06:14:08

Metfile: w24232.dvf modified Tueday, 26 August 2008 at 06:15:54

Wa ter segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 13 11.75 7.923 6.096 4.771 1.593

1962 13.59 12.38 8.655 6.764 5.404 2.106

1963 18.39 16.82 12.63 10.47 8.364 3.224

1964 13.84 12.6 8.87 7.035 5.635 2.462

1965 13.69 12.48 8.782 6.893 5.498 2.22

1966 13.45 12.2 8.445 6.618 5.27 2.1

1967 13.49 12.21 8.303 6.552 5.158 2

1968 13.59 12.75 8.944 6.835 5.451 2.153

1969 13.19 11.89 8.056 6.445 5.332 2.214

1970 13.5 12.21 8.298 6.56 5.166 2.101

1971 13.57 12.37 8.772 6.862 5.509 2.2 03

1972 13.98 12.7 8.882 7.016 5.578 2.23

1973 13.38 12.15 8.452 6.609 5.255 2.133

1974 13.59 12.35 8.537 6.712 5.341 2.115

1975 13.65 12.43 8.738 6.941 5.538 2.197

1976 13.57 12.38 8.818 6.874 5.534 2.231

1977 13.78 12.52 8.645 6.832 5.441 2.177

1978 15.0 6 13.63 9.282 7.667 6.016 2.337

1979 13.7 12.41 8.6 6.937 5.485 2.248

1980 13.54 12.35 8.932 6.932 5.591 2.244

1981 13.49 12.28 9.711 7.258 5.909 2.365

1982 13. 5 12. 21 8.275 6.555 5.185 2.117

1983 13.33 12.09 8.408 6.584 5.257 2.064

1984 14.04 12.81 9.464 7.663 6.181 2.4

1985 13.56 12.31 10.01 7.406 5.943 2.441

1986 13.56 12.27 8.374 6.674 5.306 2.163

1987 13.21 11.93 8.101 6.343 5.162 2.093

1988 13.5 12.38 8.713 6.764 5.39 2.119

1989 13.35 12.08 8.255 6.469 5.137 2.048

1990 13.4 12.16 8.388 6.56 5.172 2.01

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 18.39 16.82 12.63 10.47 8.364 3.224

0.0645161290322581 15.06 13.63 10.01 7.667 6.181 2.462

0.0967741935483871 14.04 12.81 9.711 7.663 6.016 2.441

0.129032258064516 13.98 12.75 9.464 7.406 5.943 2.4

0.161290322580645 13.84 12.7 9.282 7.258 5.909 2.365

0.193548387096774 13.78 12.6 8.944 7.035 5.635 2.337

0.225806451612903 13.7 12.52 8.932 7.016 5.591 2.248

0.258064516129032 13.69 12.48 8.882 6.941 5.578 2.244

0.290322580645161 13.65 12.43 8.87 6.937 5.538 2.231

0.32258064516129 13.59 12.41 8.818 6.932 5.534 2.23

0.354838709677419 13.59 12.38 8.782 6.893 5.509 2.22

0.387096774193548 13.59 12.38 8.772 6.874 5.498 2.214

### 11 0.419354838709677 13.57 12.38 8.738 6.862 5.485 2.203

0.451612903225806 13.57 12.37 8.713 6.835 5.451 2.197

0.483870967741936 13.56 12.35 8.655 6.832 5.441 2.177

0.516129032258065 13.56 12.35 8.645 6.764 5.404 2.163

0.548387096774194 13.54 12.31 8.6 6.764 5.39 2.153

0.580645161290323 13.5 12.28 8.537 6.712 5.341 2.133

0 .612903225806452 13.5 12.27 8.452 6.674 5.332 2.119

0.645161290322581 13.5 12.21 8.445 6.618 5.306 2.117

0.67741935483871 13.49 12.21 8.408 6.609 5.27 2.115

0.709677419354839 13.49 12.21 8.388 6.584 5.257 2.106

0.741935483870968 13.45 12.2 8.374 6.56 5.255 2.101

0.774193548387097 13.4 12.16 8.303 6.56 5.185 2.1

0.806451612903226 13.38 12.15 8.298 6.555 5.172 2.093

0.838709677419355 13.35 12.09 8.275 6.552 5.166 2.064

0.870967741935484 13.33 12.08 8.255 6.469 5.162 2.048

0.903225806451613 13.21 11.93 8.101 6 .445 5.158 2.01

0.935483870967742 13.19 11.89 8.056 6.343 5.137 2

0.967741935483871 13 11.75 7.923 6.096 4.771 1.593

0.1 14.034 12.804 9.6863 7.6373 6.0087 2.4369

Average of yearly averages: 2.2036

Inputs generated by pe5.pl

- Novemeber 2006

Data used for this run:

Output File: ORapp

Metfile: w24232.dvf

PRZM scenario: ORappleSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: glyphosate

Description Variable Name Value Units Comments

Molecular weight mwt 170.8 g/mol

Henry's Law Const. henry 2.0 7E

- 14 atm

- m^3/mol

Vapor Pressure va p r 9.75E

- 10 torr

Solubility sol 12000 mg/L

Kd Kd mg/L

Koc Koc 3100 mg/L

Photolysis half

- life kdp days Half

- life

Aerobic Aquatic Metabolism kbacw 14.1 days Halfife

Anaerobic Aquatic Metabolism kbacs 208 days Halfife

Aero bic Soil Metabolism asm 5.4 days Halfife

Hydrolysis: pH 7 days Half

- life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI cm

Application Rate: TAPP 4.424 kg/ha

Application Efficiency: APPEFF 0.99 fraction

Spray Drift DRFT 0.064 fraction of application rate applied to pond

Application Date Date 1-5 dd/mm or dd/mmm or dd

- mm or dd

- mmm

Interval 1 interval 30 days Set to 0 or delete line for single app.

app. rate 1 apprate 4.424 kg/ha

Record 17: FILTRA

IPSCND 1

UPTKF

Record 18: PLVKRT

PLDK RT

FEXTRC 0.5

### 12 Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

FLCITRUS

stored as FLcit.out

Chemical: glyphosate

PRZM environment: FLcitrusSTD.txt modified Tueday, 29 May 2007 at 13:4 5:56

EXAMS environment: ir298.exv modified Tueday, 26 August 2008 at 06:14:08

Metfile: w12844.dvf modified Tueday, 26 August 2008 at 06:14:22

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 10.41 8.789 5.742 3.873 3.427 1.186

1962 19.78 16.79 10.48 7.718 6.068 2.171

1963 10.69 9.044 5.262 3.584 3.413 1.579

1964 12.93 11.69 7.891 5.515 5.162 1.929

1965 14.68 12.63 8.593 6.561 5.757 1.998

1966 37.13 33.43 20.24 14.15 11.54 3.936

1967 11.79 10.9 8.451 6.31 5.653 2.298

1968 24.05 20.73 14.09 9.713 10.28 3.683

1969 12.71 11.16 8.157 6.37 5.939 2.497

1970 11.57 9.903 6.725 5.483 5.305 1.961

1971 11.04 9.448 5.428 4.175 3.769 1.445

1972 31.47 26.77 15.87 10.7 9.807 3.316

1973 13.62 11.76 7.476 5.085 4.791 1.899

1974 11.84 10.64 7.282 5.512 4.506 1.622

1975 11.39 9.793 5.694 4.308 3.976 1.449

1976 13.14 11.26 8.26 5.287 4.445 1.773

1977 11.04 9.427 6.225 4.665 4.337 1.96

1978 15.05 12.81 8.011 6.29 6.058 2.13

1979 11.18 9.536 6.687 5.305 4.637 1.745

1980 11.21 9.558 5.552 4.289 4.143 1.642

1981 13. 08 11. 55 7.398 5.2 4.662 1.916

1982 11.17 9.484 6.522 4.563 4.485 1.723

1983 14.21 12.18 8.979 5.768 5.942 2.054

1984 11.68 10.01 6.878 5.231 4.996 1.866

1985 14.07 12 7.652 6.234 5.001 1.821

1986 11.91 10.19 6.067 4.925 4.558 1.616

1987 10.9 9.797 6.159 4.232 3.766 1.46

1988 21.89 18.77 12.5 10.53 9.625 3.419

1989 14.21 12.04 7.791 4.764 4.048 1.676

1990 22.07 18.7 11.46 9.487 7.345 2.569

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 37.13 33.43 20.24 14.15 11.54 3.936

0.0645161290322581 31.47 26.77 15.87 10.7 10.28 3.683

0.0967741935483871 24.05 20.73 14.09 10.53 9.807 3.419

0.129032258064516 22.07 18.77 12.5 9.713 9.625 3.316

0.161290322580645 21.89 18.7 11.46 9.487 7.345 2.569

0.193548387096774 19.78 16.79 10.48 7.718 6.068 2.497

0.225806451612903 15.05 12.81 8.979 6.561 6.058 2.298

0.258064516129032 14.68 12.63 8.593 6.37 5.942 2.171

0.290322580645161 14.21 12.18 8.451 6.31 5.939 2.13

0.32258064516129 14.21 12.04 8.26 6.29 5.757 2.054

### 13 0.354838709677419 14.07 12 8.157 6.234 5.653 1.998

0.387096774193548 13.62 11.76 8.011 5.768 5.305 1.961

0.419354838709677 13.14 11.69 7.891 5.515 5.162 1.96

0.451612903225806 13.08 11.55 7.791 5.512 5.001 1.929

0.483870967741936 12.93 11.26 7.652 5.483 4.996 1.916

0.516129032258065 12.71 11.16 7.476 5.305 4.791 1.899

0.548387096774194 11.91 10.9 7.398 5.287 4.662 1.866

0.580645161290323 11.84 10.64 7.282 5.231 4.637 1.821

0.612903225806452 11.79 10.19 6.878 5.2 4.558 1.773

0.645161290322581 11.68 10.01 6.725 5.085 4.506 1.745

0.67741935483871 11.57 9.903 6.687 4.925 4.485 1.723

0.709677419354839 11.39 9.797 6.522 4.764 4.445 1.676

0.741935483870968 11.21 9.793 6.225 4.665 4.337 1.642

0.774193548387097 11.18 9.558 6.159 4.563 4.143 1.622

0.806451612903226 11.17 9.536 6.067 4.308 4.048 1.616

0.838709677419355 11.04 9.484 5.742 4.289 3.976 1.579

0.870967741935484 11.04 9.448 5.694 4.232 3.769 1.46

0.903225806451613 10.9 9.427 5.552 4.175 3.766 1.449

0.935483870967742 10.69 9.044 5.428 3.873 3.427 1.445

0.967741935483871 10.41 8.789 5.262 3.584 3.413 1.186

0.1 23.852 20.534 13.931 10.4483 9.7888 3.4087

Average of yearly averages: 2.07796666666667

Inputs generated by pe5.pl

- Novemeber 2006

Data used for this run:

Output File: FLcit

Metfile: w12844.dvf

PRZM scenario: FLc itrusSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: glyphosate

Description V ar iable Name Value Units Comments

Molecular weight mwt 170.8 g/mol

Henry's Law Const. henry 2.07E

- 14 atm

- m^3/mol

Vapor Pressure vapr 9.75E

- 10 torr

Solubility sol 12000 mg /L

Kd Kd mg/L

Koc Koc 3100 mg/L

Photolysis half

- life kdp days Half

- life

Aerobic Aquatic Metabolism kbacw 14.1 days Halfife

Anaerobic Aquatic Metabolism kbacs 208 days Halfife

Aerobic Soil Metabolism asm 5.4 days Halfife

Hydrolysis: pH 7 days Half

- life

M ethod: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI cm

Application Rate: TAPP 0.882 kg/ha

Application Efficiency: APPEFF 0.99 fraction

Spray Drift DRFT 0.064 fraction of application rate applied to pond

Application Date Date 1-5 dd/mm or dd/mmm or dd

- mm or dd

- mmm

Interval 1 interval 30 days Set to 0 or delete line for single app.

app. rate 1 apprate 2.395 kg/ha

Interval 2 interval 30 days Set to 0 or delete line for single app.

app. rate 2 apprate 2.52 kg/ha

Interval 3 interval 30 days Set to 0 or delete line for single app.

app. rate 3 apprate 4.158 kg/ha

### 14 Record 17: FILTRA

IPSCND 1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run )

CACITRUS

stored as CAcit.out

Chemical: glyphosate

PRZM environment: CAcitrus_WirrigSTD.txt modified Tueday, 29 May 2007 at 13:41:26

EXAMS environment: ir298.exv modified Tueday, 26 August 2008 at 06:14:08

Metfile: w23155.dvf modified Tueday, 26 August 2008 at 06:15:34

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 10.27 8.612 4.726 3.016 2.749 0.9507

1962 10.43 8.854 5.066 3.301 3.046 1.206

1963 10.72 9.148 5.317 3.531 3.251 1.304

1964 10.44 8.832 4.968 3.259 3.042 1.236

1965 10.54 8.937 5.205 3.447 3.206 1.298

1966 10.57 8.977 4.988 3.333 3.061 1.32

1967 10.49 8.704 4.618 3.079 2.952 1.241

1968 10.29 8.579 4.952 3.152 2.889 1.163

1969 10.43 8.659 4.653 3.033 2.857 1.107

1970 11.85 10.7 7.593 3.868 2.74 1.602

1971 10 .47 8.734 4.811 3.217 3.124 1.688

1972 10.43 8.76 4.929 3.255 3.148 1.267

1973 10.44 8.742 4.877 3.131 2.846 1.141

1974 10.33 8.748 5.65 3.188 2.973 1.612

1975 10.47 8.813 4.997 3.274 3.03 1.383

1976 10.35 8.721 5.089 3.275 2.975 1.167

1977 10.34 8.665 5.6 98 3.984 3.426 1.425

1978 10.35 8.643 4.763 3.093 2.886 1.226

1979 10. 34 8. 678 4.906 3.149 2.865 1.099

1980 10.52 8.836 4.988 3.266 3.065 1.166

1981 10.3 8.628 4.697 3.01 2.751 1.247

1982 10.33 8.636 4.755 3.081 2.864 1.171

1983 10.62 9.059 5.66 4.185 3.65 2 1.496

1984 10.38 8.673 4.844 3.183 3.004 1.245

1985 10.36 8.706 5.044 3.238 2.963 1.297

1986 10.54 8.936 4.94 3.284 3.027 1.267

1987 10.72 9.257 5.341 3.563 3.209 1.715

1988 10.52 8.819 5.033 3.305 3.137 1.444

1989 10.56 8.933 5.196 3.381 3.107 1.257

199 0 10.38 8.734 5 3.246 3.011 1.212

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 11.85 10.7 7.593 4.185 3.652 1.715

0.0645161290322581 10.72 9.257 5.698 3.984 3.426 1.688

0.0967741935483871 10.72 9.148 5.66 3.868 3.251 1.612

0.129032258064516 10.62 9.059 5.65 3.563 3.209 1.602

### 15 0.161290322580645 10.57 8.977 5.341 3.531 3.206 1.496

0.193548387096774 10.56 8.937 5.317 3.447 3.148 1.444

0.225806451612903 10.54 8.936 5.205 3.381 3.137 1.425

0.258064516129032 10.54 8.933 5.196 3.33 3 3.124 1.383

0.290322580645161 10.52 8.854 5.089 3.305 3.107 1.32

0.32258064516129 10.52 8.836 5.066 3.301 3.065 1.304

0.354838709677419 10.49 8.832 5.044 3.284 3.061 1.298

0.387096774193548 10.47 8.819 5.033 3.275 3.046 1.297

0.419354838709677 10.47 8.81 3 5 3.274 3.042 1.267

0.451612903225806 10.44 8.76 4.997 3.266 3.03 1.267

0.483870967741936 10.44 8.748 4.988 3.259 3.027 1.257

0.516129032258065 10.43 8.742 4.988 3.255 3.011 1.247

0.548387096774194 10.43 8.734 4.968 3.246 3.004 1.245

0.580645161290323 10 .43 8.734 4.952 3.238 2.975 1.241

0.612903225806452 10.38 8.721 4.94 3.217 2.973 1.236

0.645161290322581 10.38 8.706 4.929 3.188 2.963 1.226

0.67741935483871 10.36 8.704 4.906 3.183 2.952 1.212

0.709677419354839 10.35 8.678 4.877 3.152 2.889 1.206

0.741935483870968 10.35 8.673 4.844 3.149 2.886 1.171

0.774193548387097 10.34 8.665 4.811 3.131 2.865 1.167

0.806451612903226 10.34 8.659 4.763 3.093 2.864 1.166

0.838709677419355 10.33 8.643 4.755 3.081 2.857 1.163

0.870967741935484 10.33 8.636 4.726 3.079 2.846 1.141

0.903225806451613 10.3 8.628 4.697 3.033 2.751 1.107

0.935483870967742 10.29 8.612 4.653 3.016 2.749 1.099

0.967741935483871 10. 27 8. 579 4.618 3.01 2.74 0.9507

0.1 10.71 9.1391 5.659 3.8375 3.2468 1.611

Average of yearly averages: 1.29842333333 333

Inputs generated by pe5.pl

- Novemeber 2006

Data used for this run:

Output File: CAcit

Metfile: w23155.dvf

PRZM scenario: CAcitrus_WirrigSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: glyphosate

Description Variable Name Value Units Comment s

Molecular weight mwt 170.8 g/mol

Henry's Law Const. henry 2.07E

- 14 atm

- m^3/mol

Vapor Pressure vapr 9.75E

- 10 torr

Solubility sol 12000 mg/L

Kd Kd mg/L

Koc Koc 3100 mg/L

Photolysis half

- life kdp days Half

- life

Aerobic Aquatic Metabolism kbacw 14.1 days H alfife

Anaerobic Aquatic Metabolism kbacs 208 days Halfife

Aerobic Soil Metabolism asm 5.4 days Halfife

Hydrolysis: pH 7 days Half

- life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI cm

Application Rate: TAPP 0.882 kg/ha

Application Efficiency: APPEFF 0.99 fraction

Spray Drift DRFT 0.064 fraction of application rate applied to pond

Application Date Date 1-5 dd/mm or dd/mmm or dd

- mm or dd

- mmm

### 16 Interval 1 interval 30 days Set to 0 or delete line for single app.

app. rate 1 apprate 2.395 kg/ha

Interval 2 interval 30 days Set to 0 or delete line for single app.

app. rate 2 apprate 2.52 kg/ha

Interval 3 interval 30 days Set to 0 or delete line for single app.

app. rate 3 apprate 4.158 kg/ha

Record 17: FILTRA

IPSCND 1

UPTKF

Record 18: PLV KRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

SCI

- GROW

SCIGROW

VERSION 2.3

ENVIRONMENTAL FATE AND EFFECTS DIVISION

OFFICE OF PESTICIDE PROGRAMS

U.S. ENVIRONMENTAL PROTECTION AGENCY

SCREENING MODEL

FOR AQUATIC PESTICIDE EXPOSURE

SciGrow version 2.3

chemical:glyphosate

time is 10/11/2012 11:25:54

------------------------------------------------------------------------ Application Number of Total Use Koc Soil Aerobic

rate (lb/acre) applications (lb/acre/yr) ( ml/g) metabolism (days)

------------------------------------------------------------------------

8.250 1.0 8.250 3.10E+03 5.4

------------------------------------------------------------------------ groundwater sc reening cond (ppb) = 3.78E

- 02

************************************************************************