### UN ITED STATES E ' V IR ONMENTAL PROT ECTION AGENCY

WASHI GTON D

. C

. . 20460



### PC Code: 014002

DP Barcode: 403785

Date: October 4, 2012

MEMORAND U M OFFICE OF C llf.:\ll C. \L**,n n**  /\NO l'Ot! XT I ON PREV. : NT IO:"'i



### SUBJECT: Revised R eco mmend a ti ons for Tier IJ 

### Est imat ed Surface Drinkin g Water

Concen trati o n s and Estimated Ground Water Concentrations (E DWC s) for

Hydroge n Cyanam id e for Use in Hum an Health Ri sk Assessment.



### TO: Bonnie Cropp-Kohlligian

, Risk Assessor

Risk Assessment Bran c h IV

H ea lth Effects Division (7509 P )



### FROM: ......_ 

## ..___ _ ...... 

### Ibrahim Abdel-Saheb

, Ph.D.

, Env ironm e nt al Scientist

....._ Environmental Risk Br anch V I

E n viro nm e nt a l Fate and Effects Divi sio n (7507 P )



### THROUGH : Mark Corbin

, Branch Chief

Enviro nm ental Risk Bran c h VI

Enviro nm ental Fate and Effects Di v i sio n (7507 P

Office of Pe st i c id e Progr a m s

Office of Chemical Safety & 

### P o llution Pr eve ntion

This rev i sed drinking water m e m o r eflects the r ecommendation to use the peak and annual mean

from the Ml Che rri es sce n ario and the 30-year mean from the CA Grapes scena ri o

. T h ese

represent the highest va lu es amo n g all of the sce n arios m ode led in this assess m en t.

Tab l e I s how s the E DW Cs recommended for the human health risk assessment represented by

MI Che rri es sce nario and CA Gra p es. A ll r eg i ste r ed c rop s were m o d e led to exp l o r e th e high est

exposu re po ss ibl e from th e use of h ydroge n cyanamide o n those c r ops ( Tabl e 2). The mod e l

scenario producing the highest EECs was chose n to provide the EDWCs recommended for the

human health risk assessment.

Th e va lu es genera t ed b y t h e model s fo r dri nkin g wate r were multipli e d by a pe r ce nt crop area

facto r ( PCA )

, w hi ch repr esen t s th e m aximum exte n t to w hich H UC-8 wa t e r s h eds in the2 

### continental US are planted to particular agricultural crops. The PCA value used (0.23) was for

Orchard/Vineyard.

Tab le 1. Estimated Drinking Water Concentrations (EDWC) of hydrogen cyanamide

residues in surface water and groundwater recommended for use in dietary risk

assessment.

S cenario

Model

(application rate lb a.i./A, frequency) Surface Water

1

- in

- 10 year Hy drogen cyanamide Concentration

(μg/L)*

Peak Annual

Mean 30

- Year Mean

MIcherries.std

PRZM (V. 3.12)/EXAMS (V.2.98)

(17.6 lb/acre, 1x) 50.4 3.36 0.67**

PRZM

- GW (V. 1.0)

(17.6 lb/acre, 1x)

Highest daily value

Simulation Avg. value 0.841 μg/L

0.060 μg/L

*: Surface water EDWC Values were multiplied by PCA of 0.23.

** Based on the highest 30

- year mean (CA grapes) among all scenarios modeled in this assessment.



### Table 2. Estimated Drinking Water Concentrations (EDWC) of hydrogen cyanamide

residues in drink ing water for all scenarios modeled.

Crop PRZM Scenario Peak Annual

Mean 30

- Year

Mean

Apples ORapplesSTD.txt 17.1 1.13 0.34

PAapplesSTD.txt 8.20 0.63 0.40

NCapplesSTD.txt 5.66 0.39 0.113 

### Blackberry/Blueberry GApeachesSTD.txt 4.78 0.25 0.11

Cherry M IcherriesSTD.txt 50.4 3.36 0.57

Grapes CAgrapes_WirrigSTD.txt 46.2 2.76 0.67

NYgrapesSTD.txt 9.15 0.45 0.22

Kiwifruit/Fig CAfruit_WirrigSTD.txt 42.3 1.7 0 0.45

Peaches/Nectarines GApeachesSTD.txt 38.9 1.72 0.43



## Fate and Transport Characterization

T he available environmental fate data for hydrogen cyanamide indicate that it is not persistent in

soil or water, and is not expected to partition into air except by spray drift at the time of

application. Abiotic degradation processes (hydrolysis and photo lysis) are not important, as

metabolism is much quicker. Cyanamide is completely miscible with water, and in batch

equilibrium experiments less than 2% of the mass adsorbed to sandy and silt loam soil. Thus, it is

expected to be very mobile in soil

- water s ystems. The degradates of cyanamide include simple

nitrogen compounds (dicyanodiamide, guanylurea, guanidine, and urea) which are read ily

utilized as plant nutrients (Table 3). As noted above these were not considered to be of

toxicological concern and we re not included in the drinking water assessment.

T able 3. Summary of Maximum Degradate Amounts in Environmental Fate Studies of

hydrogen cyanamide.

Degradate Max. Degradate % of Applied (Time of Peak) Analyzed Degradates

Hydr

olysis Aqueous

Photolysis Aerobic Soil Anaerobic

Aquatic Aerobic

Aquatic TFD Ground

Water

Urea 42.4% (pH

5;30 d)

12.2% (pH 7,

30 d) 6.7% (2 d)

13.4% (1 d) No study

CO 2 97.1% (14 d) 86.1% (28

d)

83.6% (28

d)4 

## Drinking Wat er Exposure Modeling

Groundwater

The PRZM

- GW User Interface is a Visual Basic tool that generates input files for PRZM,

runs PRZM, and performs some post processing. A daily time series file, peak and average

concentrations are the main output products. The input files that the PRZM

- GW User Interface

produces specifically satisfy the conceptual model put forth by the NAFTA group responsible for

Tier 2 groundwater model coordination.

In the NAFTA conceptual model, pesticide is applied to a crop and hydro logical processes

drive the pesticide through the ground and into an aquifer positioned at a user

- defined depth

below the surface. Pesticide sorbs and degrades as it travels through the profile, with surface

degradation declining in proportion with depth to a depth of 1 meter where the surface

degradation is zero. In the case where hydrolysis occurs in the aqueous phase of the soil profile,

the aqueous phase degradation will be the larger of the hydrolysis rate or the depth

- adjusted

surface rate. Output concentrations are the vertical spatial average of the (saturated) aquifer

from the water table to the bottom of the well screen.



## Table 4 provides the input parameter values used for modeling of hydrogen cyanamide using

PRZM

- GW. Model output is shown in Appendix I

.

Table 4

. PRZM

- GW ( V. 1.0 ) input parameter values for hydrogen cyanamide

.

Parameter (units) Input Value

[ Specific Parameter

Guidance ] Data Source

Application rate

(kg a.i. ha

- 1 

### ) 19.7 EPA Reg. No. 54555

- 2

Application Method application to fo liage (CAM

2) EPA Reg. No. 54555

- 2

Hydrolysis half

- life

(days) Stable Literature Review; EFED

Review of Data, 1993

Soil Half

- life (days) 0.5 MRID 42178410 Dicyanodiamide 5.38% (0.33 d) 0.3% (6 d)5 

### Parameter (units) Input Value

[ Specific Parameter

Guidance ] Data Source

Pesticide partition or

distribution

coefficients

(cm 3 

### g - 1 

### ) 7.3 EPIWEB 4.1



## Surface Water

For Tie r 2 drinking water assessments, two models are used in tandem. PRZM simulates fate

and transport on the agricultural field. The version of PRZM used was PRZM 3.12. For

agricultural applications, the water body is simulated with EXAMS version 2.98. Tier 2

simulations are run for multiple (usually 30) years and the reported EECs are the concentrations

that are expected once every ten years based on the thirty years of daily values generated by the

simulation.

The proposed 900 ft buffer zone on the label was used to calculate the spray drift fraction input

of PRZM model using the model AgDrift (v. 2.01). The model resulted in spray drift fraction of

0.001.

The m ain assumptions used in this assessment include the following:

1

- The label currently includes a sp ray drift buffer from aquatic resources of 900 feet which was

incorporated into the modeling which reduced the percentage of drift from the default value of

6.4% to 0.1%

.

3

- PRZM

- EXAMS was run using the volatility routine due to the reported volatility. The use of

this routine in PRZM is a non standard approach because this routine has not been validated

within EFED. However, this refinement did not make a significant difference in the resulting

EDWC most likely due to low Henry's law constant.

4

- Sever al of the model inputs were not based on guideline studies but rather on open literature

data.

5

– Several of the model inputs (described below) were estimated using EPA’s EpiSuite model

due to a lack of data.

Table 5 provides the input parameter values us ed for modeling of hydrogen cyanamide using

PRZM/EXAMS

. The use of estimated model inputs and open literature data does add some

uncertainty to the reported results. Model output is shown in Appendix I.6 

### Table 5

. PRZM/EXAMS input param eter values for hyd rogen cyanamide applied to cherry

orchards

.

PAR AME TER (units) VALUE

( S ) SOURCE COMME NT

Mol. Wt (g/mol) 42.04 Lide, D.R. 2007

Solubility (mg/L) 7.8E+5 EPIWEB 4.1 Tomlin (2003) as cited in

EPISuite

Henry’s Law Constant

(atm

- m 3 

### /mol) 2.68 X 10

- 10 

### EPIWEB 4. 1 Value calculated from

literature values for vapor

pressure and solubility cited

in EPISuite

Vap. Pressure (Torr) 0.00375 EPIWEB 4.1 Tomlin (2003) as cited in

EPiSuite

ENPY ( Vap. Enthalpy ;

Kcal/mol) 16.4 O'Neil, M.J. (ed.). 2006

DAIR ( Air Diffusion ;

cm 2 

### /d) 12

, 823 Calculated* Calculated using air

diffusion and mol.wt

. of

know n compounds

Application Rate (lb a.i.

/A) 1 7.6 EPA Reg. No. 54555

- 2

Number of Applications 1 EPA Reg. No. 54555

- 2

Interval between

Applications (days) N/A EPA Reg. No. 54555

- 2

Percent Cropped Area

(decimal) 0.23 USEPA. 2012 Orchard/Vineyard

spray drift fraction 0.001 AgDrift modeling using a

propose d 900 ft buffer zone EPA Reg. No. 54555

- 2

Soil Partition Coefficient

K OC 

### , (mL/g) 7.3 EPIWEB 4.1 Data in MRID 42178415

could no t be used to

determine coefficient.

Aerobic Soil Metabolism

Half

- life

(days) 1.5 MRID 42178410 Single half

- life is available;

multiplied by 3; Guidance

for Selecting Input

Parameters in

Modeling the

Environmental Fate and

Transport of Pesticides

Version 2.1 (2009)7 

### Depth of Incorporation

(inches ) 0 EPA Reg. No. 54555

- 2

Hydrolysis Half

- life @ pH

7 (days) stable Literature Review EFED Review of Data,

1993.

Aerobic Aquatic

Metabolism

Half

- life (days) 5.28 MRID# 45382202 Represents the 90th

percentile o f the upper

confidence bound on the

mean of 2 half

- life values:

1.2, and 3.2; mean 2.2, std.

dev, 1.41 . Guidance for

Selecting Input Parameters

in

Modeling the

Environmental Fate and

Transport of Pesticides

Version 2.1 (2009)

Anaerobic Aquatic

Metabolism

Half

- life (days) 70 MRID#42178412 Anaerobic soil met. Half

life of 35 d. x2; Guidance

for Selecting Input

Parameters in

Modeling the

Environmental Fate and

Transport of Pesticides

Aquatic Photolysis Half

life @ pH 7 (days) 29 MRID# 42178409 Guidance fo r Selecting

Input Parameters in

Modeling the

Environmental Fate and

Transport of Pesticides

Version 2.1 (2009)

*: D1=D2*√ MW2/MW1; D1: unknown air diffusion, D2: known air diffusion

= 14688 ( for M ethanol ; Thoma et al.,

1992 ) ; MW2 for known = 32.04 ( Me thanol )

.



## Monitoring Data

The US Geological Survey National Water Quality Assessment program (NAWQA) contains no

monitoring data for hydrogen cyanamide in surface water or groundwater.

No monitoring data for hydrogen cyanamide was found in the US EPA Pesticides in Ground

Water Database (1971

- 1991).



## REFERENCES

Lide, D.R. 2007. CRC Handbook of Chemistry and Physics 88TH Edition 2007

- 2008. CRC

Press, T aylor & Francis, Boca Raton, FL; p. 3

- 124

.8 

### O'Neil, M.J. (ed.). 2006. The Merck Index

- An Encyclopedia of Chemic als, Drugs, and

Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., p. 448.

PRZM

- 3, 2005. A Model for Predicting Pesticide and Nitrogen Fate in the Crop Root and

Unsaturated Soil Zones: Users Manual for Release 3.12.2. Ecosystems Research Division

N ational Exposure Research Laboratory Athens, GA 30605

- 2700.

Thoma, G. J., G. Hildebrandt , K. T. Valsaraj, L. J. Thibodeaux, and C. Springer . 1992. Transport

of chemical vapors through soil: A landfill cover simulation experiment, J. Hazard. Mat., 30:333

-

342.

Tomlin, C.D.S., 2003. The pesticide manual. A world compendium (13th ed.). British Crop

Protection Council, Alton, Ha mpshire, UK.

Tomlin, CDS, ed. 2004

- 05. Cyanamide (420

- 04

- 2). In: The e

- Pesticide Manual, 13th Edition

Version 3.1

. Surrey UK, Britis h Crop Protection Council.

USEPA. 2004. USER’S GUIDE FOR THE AERMOD METEOROLOGICAL REPROCESSOR

(AERMET). Office of Air Quality Planning and Standards Emissions, Monitoring, and Analysis

Division Research Triangle Park, North Carolina 27711.

USEPA. 2012. Development and Use of Percent Cropped Area and Percent Turf Area

Adjustment Factors in Drinking Water Exposure Assessments. Office of Pesticide Programs9 

# Appendix I

PRZM

- GW INPUT FILE (Groundwater)

9/19/2012 7:56:52 AM; Hydrogen Cyanamide; GA

- Southe rn Coastal Plain, Tifton loamy sand

- PEANUTS

User Interface Version: PRZM

- GW (Version 1.00)

***Record 3

0.75 0.15 0 25 1 1

***Record 6

0

***Record 8

1

***Record 9

1 0.23 60 80 1 10 1 0 10 0 100

***Record 10

30

***Record 11

010561 010861 011061 1

010562 010862 011062 1

010563 010863 011063 1

010564 010864 011064 1

010565 010865 011065 1

010566 010866 011066 1

010567 010867 011067 1

010568 010868 011068 1

010569 010869 011069 1

010570 010870 011070 1

010571 010871 011071 1

010572 010872 011072 1

010573 010873 011073 1

010574 010874 011074 1

010575 010875 011075 1

010576 010876 011076 1

010577 010877 011077 1

010578 010878 011078 1

010579 010879 011079 1

010580 010880 011080 1

010581 010881 011081 1

010582 010882 011082 1

010583 010883 011083 1

010584 010884 011084 1

010585 010885 011085 1

010586 010886 011086 1

010587 010887 011087 1

010588 010888 011088 1

010589 010889 011089 1

010590 010890 011090 1

***Record 12

Place Holder

***Record 1310 30 1 0 0

***Record 15

Place Holder

***Record 16

24 361 0 2 4 19.7 1 0

24 362 0 2 4 19.7 1 0

24 363 0 2 4 19.7 1 0

24 364 0 2 4 19.7 1 0

24 365 0 2 4 19.7 1 0

24 366 0 2 4 19.7 1 0

24 367 0 2 4 19.7 1 0

24 368 0 2 4 19.7 1 0

24 369 0 2 4 19.7 1 0

24 370 0 2 4 19.7 1 0

24 371 0 2 4 19.7 1 0

24 372 0 2 4 19.7 1 0

24 373 0 2 4 19.7 1 0

24 374 0 2 4 19.7 1 0

24 375 0 2 4 19.7 1 0

24 376 0 2 4 19.7 1 0

24 377 0 2 4 19.7 1 0

24 378 0 2 4 19.7 1 0

24 379 0 2 4 19.7 1 0

24 380 0 2 4 19.7 1 0

24 381 0 2 4 19.7 1 0

24 382 0 2 4 19.7 1 0

24 383 0 2 4 19.7 1 0

24 384 0 2 4 19.7 1 0

24 385 0 2 4 19.7 1 0

24 386 0 2 4 19.7 1 0

24 387 0 2 4 19.7 1 0

24 388 0 2 4 19.7 1 0

24 389 0 2 4 19.7 1 0

24 390 0 2 4 19.7 1 0

***Record 17

0 2 0

***Record 18

0 0 0.5

***Record 19

Place H older

***Record 20

1000 0 0 0 0 0 0 1 1 0

***Record 26

0 0 0

***Record 31

0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.97 10.0

***Record 32

19 19 19 19 19 19 19 19 19 1 9 19 19

***Record 32A

2.00 25.0

***Record 33

8

*** Record 34,36,37 Horizon 1

1 10 1.77 0.168 0 0 0

1.39 1.39 0

1 0.168 0.064 0.75 0.0547511 19 66 3.7 0 0

*** Record 34,36,37 Horizon 2

2 10 1.77 0.168 0 0 0

1.31 1.31 0

5 0.168 0.064 0.75 0.05475

19 66 3.7 0 0

*** Record 34,36,37 Horizon 3

3 20 1.78 0.24 0 0 0

1.08 1.08 0

20 0.24 0.105 0.25 0.01825

19 67 12.2 0 0

*** Record 34,36,37 Horizon 4

4 20 1.67 0.257 0 0 0

0.77 0.77 0

20 0.257 0.19 0.25 0.01825

19 55 21.5 0 0

*** Record 34,36,37 Horizon 5

5 20 1.67 0.256 0 0 0

0.462 0.462 0

20 0.256 0.19 0.25 0.01825

19 55 20 0 0

*** Record 34,36,37 Horizon 6

6 20 1.65 0.241 0 0 0

0.154 0.154 0

20 0.241 0.17 0.25 0.01825

19 54 20 0 0

*** Record 34,36,37 Horizon 7

7 800 1.67 0.281 0 0 0

0 0 0

50 0.281 0.207 0.25 0. 01825

19 53 19 0 0

*** Record 34,36,37 Horizon 8

8 100 1.67 0.3661 0 0 0

0 0 0

50 0.3661 0.001 0.25 0.01825

19 53 21 0 0

*** Record 40

0

*** Record 42

YEAR 10 YEAR 10 YEAR 10 0

*** Record 45

3 YEAR

*** Record 46

DCON1 TAVE 33 34 1.0E3

INFL TCUM 33 33 0.0036

IRRG TSE R12 

## PRZM/EXAMS Output File (Surface Water)

stored as HcyanamideMIcherries2.out

Chemical: Hcyanamide

PRZM environment: MICherriesSTD.txt modified Tueday, 29 May 2007 at 13:56:56

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 15:34:12

M etfile: w14850.dvf modified Wedday, 3 July 2002 at 09:05:40

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 40.32 38.34 30.14 17.71 12.42 3.083

1962 22.88 21.73 16.62 9.099 6.24 1.545

1963 36.1 34.33 27.56 15.61 10.89 2 .698

1964 0.7199 0.6845 0.5366 0.2992 0.2053 0.05097

1965 0.719 0.6836 0.5498 0.3327 0.232 0.05758

1966 0.719 0.6821 0.5396 0.3206 0.2251 0.05573

1967 4.748 4.517 3.619 2.075 1.46 0.3619

1968 0.7191 0.6797 0.5411 0.3036 0.2106 0.05204

1969 0.719 0.6836 0.5 87 0.3464 0.2411 0.05983

1970 0.719 0.6836 0.5329 0.2952 0.2037 0.05039

1971 1.208 1.126 0.8538 0.55 0.385 0.09527

1972 0.719 0.6836 0.5463 0.3242 0.2253 0.05569

1973 2.911 2.698 1.996 1.151 0.8123 0.2012

1974 3.338 3.155 2.334 1.319 0.9252 0.2293

1975 10. 44 9.929 7.914 4.624 3.183 0.7873

1976 261 255 199 109 75.9 18.73

1977 31.18 29.82 22.65 12.04 8.228 2.03813 1978 0.7197 0.6843 0.5566 0.3302 0.229 0.05698

1979 36.89 34.96 27.12 15.75 10.98 2.731

1980 0.7201 0.6847 0.5388 0.3077 0.2133 0.05312

1981 5.45 5.2 28 3.945 2.179 1.52 0.3763

1982 270 256 205 119 81.84 20.27

1983 0.7264 0.6904 0.5525 0.3329 0.2362 0.06122

1984 0.719 0.6837 0.5505 0.3205 0.2242 0.05541

1985 46.63 44.31 32.95 17.71 12.23 3.031

1986 238 228 176 93.73 64.39 15.94

1987 0.7246 0.685 0.5206 0.279 0.191 0.04925

1988 1.445 1.344 1.026 0.6313 0.4374 0.1079

1989 13.9 13.46 10.48 6.026 4.197 1.04

1990 0.7193 0.681 0.5728 0.325 0.2262 0.05616

Sorted results

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

0.032258064516129 270 256 205 119 81.84 20.27

0.0645161290322581 261 255 199 109 75.9 18.73

0.0967741935483871 238 228 176 93.73 64.39 15.94

0.129032258064516 46.63 44.31 32.95 17.71 12.42 3.083

0.161290322580645 40.32 38.34 30.14 17.71 12.23 3.031

0.193548387096774 36.89 34.96 27.56 15.75 10.98 2.73 1

0.225806451612903 36.1 34.33 27.12 15.61 10.89 2.698

0.258064516129032 31.18 29.82 22.65 12.04 8.228 2.038

0.290322580645161 22.88 21.73 16.62 9.099 6.24 1.545

0.32258064516129 13.9 13.46 10.48 6.026 4.197 1.04

0.354838709677419 10.44 9.929 7.914 4.624 3 .183 0.7873

0.387096774193548 5.45 5.228 3.945 2.179 1.52 0.376314 0.419354838709677 4.748 4.517 3.619 2.075 1.46 0.3619

0.451612903225806 3.338 3.155 2.334 1.319 0.9252 0.2293

0.483870967741936 2.911 2.698 1.996 1.151 0.8123 0.2012

0.516129032258065 1.445 1 .344 1.026 0.6313 0.4374 0.1079

0.548387096774194 1.208 1.126 0.8538 0.55 0.385 0.09527

0.580645161290323 0.7264 0.6904 0.587 0.3464 0.2411 0.06122

0.612903225806452 0.7246 0.685 0.5728 0.3329 0.2362 0.05983

0.645161290322581 0.7201 0.6847 0.5566 0.3327 0. 232 0.05758

0.67741935483871 0.7199 0.6845 0.5525 0.3302 0.229 0.05698

0.709677419354839 0.7197 0.6843 0.5505 0.325 0.2262 0.05616

0.741935483870968 0.7193 0.6837 0.5498 0.3242 0.2253 0.05573

0.774193548387097 0.7191 0.6836 0.5463 0.3206 0.2251 0.05569

0.8 06451612903226 0.719 0.6836 0.5411 0.3205 0.2242 0.05541

0.838709677419355 0.719 0.6836 0.5396 0.3077 0.2133 0.05312

0.870967741935484 0.719 0.6836 0.5388 0.3036 0.2106 0.05204

0.903225806451613 0.719 0.6821 0.5366 0.2992 0.2053 0.05097

0.935483870967742 0 .719 0.681 0.5329 0.2952 0.2037 0.05039

0.967741935483871 0.719 0.6797 0.5206 0.279 0.191 0.04925

0.1 218.863 209.631 161.695 86.128 59.193 14.6543

Average of yearly averages: 2.46598466666667

Inputs generated by pe5.pl

- Novemeber 2006

Data used for this run:

Output File: HcyanamideMIcherries2

Metfile: w14850.dvf

PRZM scenario: MICherriesSTD.txt15 EXAMS environment file: ir298.exv

Chemical Name: Hcyanamide

Description Variable Name Value Units Comments

Molecular weight mwt 42.04 g/mol

Henry's Law C onst. henry 2.68E

- 10 atm

- m^3/mol

Vapor Pressure vapr 0.00375 torr

Solubility sol 7.8E5 mg/L

Kd Kd mg/L

Koc Koc 7.3 mg/L

Photolysis half

- life kdp 29 days Half

- life

Aerobic Aquatic Metabolism kbacw 5.28 days Halfife

Anaerobic Aquatic Metabolism kbacs 70 day s Halfife

Aerobic Soil Metabolism asm 1.5 days Halfife

Hydrolysis: pH 7 0 days Half

- life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate: TAPP 19.7 kg/ha

Application Efficiency: APPEFF 0.99 fraction

Spray Drift DRFT 0. 001 fraction of application rate applied to pond

Application Date Date 24

- 03 dd/mm or dd/mmm or dd

- mm or dd

- mmm

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)