1

OFFICE OF

CHEMICAL SAFETY AND

POLLUTION PREVENTION

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

WASHINGTON D.C., 20460

PC Code: 046679

DP Barcode: D409837

415146

Date: September 18, 2013

MEMORANDUM

SUBJECT: Fenamidone: Drinking Water Assessment for the Proposed New Uses on Potato 

Seed, Ginseng, Bulb Onion (Crop Subgroup 3-07A), Green Onion (Crop 

Subgroup 3-07B), and Succulent Beans for Reason®500 SC (44.4% fenamidone) 

(EPA Reg. No. 264-695) and Fenamidone Technical EPA Reg. No. 264-693)

CAS Name: (5S)-3,5-dihydro-5-methyl-2-(methylthio)-5-phenyl-3-

(phenylamino)-4H-imidazol-4-one

CAS Reg. No.: 161326-34-7

FROM: James K. Wolf, Ph.D., Environmental Scientist

Environmental Risk Branch III

Environmental Fate and Effects Division (7507P)

THROUGH: James A Hetrick, Ph.D., Senior Scientist 

Rosanna Louie-Juzwiak, RAPL

Dana S. Spatz., Branch Chief 

Environmental Risk Branch III

Environmental Fate and Effects Division (7507P)

TO: Ideliz Encarnacion, Ph.D.

Michael Metzger, Ph.D., Branch Chief

Risk Assessment Branch7

Health Effects Division (7509P)

Barbara Madden, RM 05

RIMUERB

Registration Divison (7505P)
2

The registrant (Bayer Corporation) is seeking to amend the fenamidone label to allow for the 

potato seed treatment use to replace one of the registered foliar applications for potatoes and the 

IR-4 is requesting the addition of ginseng, succulent bean, and the expansion of bulb vegetables

uses (Crop Subgroups 3-07A and 3-07B, Table 1) to the fenamidone label. The maximum annual 

fenamidone application rate remains 0.80 lb a.i./A per season [year] for potatoes. Fenamidone is 

registered for use as a broad spectrum foliar fungicide for control of certain pathogenic fungal 

diseases in a variety of crops including potatoes and other tuberous and corm vegetables, 

tomatoes, onions and other bulb vegetables, lettuce, leafy vegetables, Brassica vegetables, 

tobacco, fruiting vegetables, carrots, cucurbit crops, and treatment of cotton and sunflower seeds 

as well as in-furrow application before planting of the seeds.

This memo summarizes the Tier II PRZM/EXAMS, PRZM-GW and Tier I SCI-GROW

estimated drinking water concentrations (EDWCs) of fenamidone plus its degradation products

(i.e., total fenamidone residues of concern or total toxic residues) in surface water and in 

groundwater for the proposed new uses and label amendments. The metabolites/degradation 

products, RPA-412636, RPA-412708, RPA-411639, RPA-413255, RPA-409446, and RP410995, included in the drinking water total fenamidone residues of concern1

are listed in 

Appendix 1 Table 1. The degradation products tend to be more persistent and exhibit greater 

mobility than parent fenamidone, suggesting the increased potential for degradates leaching to 

groundwater.

The drinking water EDWCs recommended for use in the human health dietary risk assessment 

are those estimated for groundwater. The highest daily total fenamidone residue concentration in 

shallow groundwater estimated by PRZM-GW is 207μg/L and the average concentration after 

breakthrough was 139 μg/L (Table 8) for the Central Sands Region of Wisconsin from 30 years 

of continuous use. These estimates represent potential exposure to private drinking water well in 

a highly vulnerable pesticide use area where numerous pesticide residues have been detected in 

groundwater.

The surface water EDWCs estimated by PRZM/EXAMS are 49.19 μg/L and 12.96 μg/L, for the 

1-in-10 year daily peak and annual mean total fenamidone residues concentration, respectively. 

The 30-year annual mean is 8.21 μg/L (Table 7). 

Previously, total fenamidone residues2in surface source drinking water (PRZM/EXAMS) for the 

1-in-10 year daily peak and annual mean concentration were 41.66 μg/L and 11.88 μg/L,

respectively, and the 30-year annual mean concentration 5.99 μg/L. The estimated total 

fenamidone residue concentration in shallow groundwater was with SCI-GROW was 178 μg/L

(Table 9).

Use Characterization

Fenamidone (REASON 500 SC Fungicide) is the active ingredient (a.i.), in the broad-spectrum 

foliar fungicide that is applied by ground, chemigation, and/or aerial equipment, and seed 

 

1

http://www.gpo.gov/fdsys/pkg/FR-2009-07-15/pdf/E9-16817.pdf

2 USEPA, 2007. Drinking Water Assessment for New Uses. (D332878, D316085, D316083; May 14, 2007).
3

treatment (sunflower and tobacco). Currently, the maximum application rate is 0.267 lb a.i./A

with a maximum seasonal [annual] rate of 0.80 lb a.i./A, with a minimum 5-day reapplication 

interval. A previous drinking water assessment was conducted for this maximum use rate.

IR-4 has proposed that fenamidone be applied at rates up to 0.267 lb a.i./A, with a 5 day

minimum reapplication interval, and a maximum seasonal rate not to exceed 0.80 lb a.i./A for 

ginseng and succulent beans (Table 1). For bulb vegetables the maximum application rate for 

fenamidone is 0.178 lb a.i./A, seasonal maximum rate of 0.71 lb a.i./A per season with a 

minimum reapplication interval of 5 days. For these uses, the application methods remain ground 

and aerial spray and chemigation. The registrant (Bayer Corporation) is also seeking to amend 

the fenamidone label3to allow for the potato seed treatment (Table 1) use to replace one of the 

registered foliar applications for potatoes. The proposed maximum annual fenamidone 

application rate remains 0.80 lb a.i./A per season for potatoes. Application rates and frequency

of application for the proposed amended uses are shown in Table 1. This assessment assumes 

that 1 season is synonymous with yearly, which is one crop per year.

Table 1. Fenamidone use and application information obtained from the proposed new uses label and the 

current potato rate for Reason®500 SC (44.4% fenamidone) (EPA Reg. No. 264-695).

Use

Max. Single App. 

Rate 

(lb a.i./A)

# of App./

Season

Seasonal Max. 

Rate (lb a.i./A)

Minimum App. 

Interval (days)

Proposed new uses and label amendment by the IR4 REASON®500 SC Fungicide 

EPA Reg. No. 264-695 (44.4% ai; 4.13 lb ai/gallon)

Bean, Succulent

Bean, lima

Bean, snap 0.267 NS (3)a

0.80 7

Ginseng 0.267 NS (3)a0.80 14

Expansion to Full Crop Groups

Onion bulb, 

Sub-group 3-07Ab

0.178 NS (4)a0.71 5 Onion, green, 

Sub-group 3-07Bb

Proposed amendment by Bayer CropScience REASON®500 SC Fungicide EPA Reg. No. 264-695 

(44.4% ai; 4.13 lbs ai/gallon) 

Potato Seed Treatmentc

0.237d

(0.15 fl oz/100 lb 

seed potato)

Seef0.80e5

f

 

Potato Foliar Application Currently Approved Label (EPA Reg. No. 264-695: as of 10/27/2011)

Potatoes 0.267 NS (3)a0.80e5

a NS-is not specified (number = maximum growing season rate/maximum rate)

b Bulb vegetables: Chive, fresh leaves; Chinese, fresh leaves; daylily, bulb; elegans hosta; fritillaria, bulb; fritillaria, leaves; 

garlic, bulb; garlic, great-headed, bulb; garlic, serpent, bulb; kurrat; lady’s leek; leek; leek, wild; lily, bulb; onion, Beltsville 

bunching; onion, bulb; onion, Chinese, bulb; onion, fresh, green; onion, macrostem; onion, pearl; onion, potato, bulb; onion, 

tree, tops; onion, Welsh, tops; shallot, bulbs; shallot, fresh leaves; cultivars, varieties, and/or hybrids of these.

c Potato seed-piece treatment (Use rate = 0.15 fl oz per 100 lbs of seed pieces).

d

4.13 lb ai/gallon * 1gallon/128 fl oz = 0.03227 lb ai/fl oz

 0.15 fl oz/100 lb psp (potato seed piece) * 0.03227 lb ai/fl oz = 0.004842 lb ai/100 lb psp

 Planting rate 1000 to 4900 lb psp/ac; 0.004842 lb ai/100 lb psp * 4900 lb psp/ac = 0.237 lb a.i./A; could be as high as 0.245 lb 

a.i./A (MRID 4897701)

 

3 EPA Reg # Fenamidone Technical 264-693 and Reason ® 500 SC 264-695).
4

e Maximum amount of fenamidone per season (year) is 0.80 lb a.i./A.

f Additional fenamidone may still applied foliarly, at maximum rate of 0.267 lb a.i./A, with a annual rate not to exceed 0.80 lb 

a.i./A.
5

Potato Seed Pieces– Seed Treatment

The proposed potato seed treatment rate is 0.15 fluid ounces per 100 pounds (cwt) of seed pieces. 

Potato seed planting rates vary from 1,800 to 4,900 lb potato seed pieces per acre according to 

information submitted by the registrant (Petition to Establish a Seed Piece Treatment Use with 

Fenamidone on Potatoes, MRID 48977101). BEAD4reports seed potato rates ranging from 

2,100 to 2,700 lb potato seed per acre. Depending upon the seeding rate for the potato pieces, the 

fenamidone application rate could range from about 0.10 to 0.245 lb a.i./A (Table 2). This 

assessment uses the maximum rate of 0.245 lb a.i./A as proposed by Bayer CropScience as a 

conservative maximum application rate for this assessment (MRID 48977101).

Table 2. Conversion of Fenamidone Rate to Potato Seed Piece per 100 lbs to Application Rate on a Pounds ai 

per acre basis.

fl oz/100 lb pspalb ai/fl ozblb ai/100 lb psp lb psp/acclb a.i./A

0.15 0.03227 0.00484 2000 0.097

0.15 0.03227 0.00484 3000 0.145

0.15 0.03227 0.00484 4000 0.194

0.15 0.03227 0.00484 4900 0.237d

a

psp = potato seed piece.

b Reason®

500 SC 264-695 density = 4.13 lb ai/gallon ; 1 gallon = 128 fl oz; 0.03227 = 4.13/128.

c MRID 48977101

d Difference between 0.237 and 0.245 lb a.i./A is due rounding during unit conversion calculations.

Fenamidone Chemistry, Environmental Fate and Transport Characterization

Fenamidone is member of the chemical family of fungicides, the imidazolinones (Figure 1). 

Fenamidone is the S-enantiomer of the racemic mixture A5-Methyl-2- methylthio-5-phenyl-3-

phenylamino-3,5-dihydroamino-4-one (IUPAC). The S-enantiomer is claimed to be the 

fungicide active enantiomer. The amount of S-enantiomer in the active ingredient is greater than 

98%. Reason®500 SC is a soluble concentrate formulation containing 44.4% fenamidone as the 

active ingredient, containing 4.13 lbs of fenamidone per gallon of product.

 

4Becker, J. and S. Ratnayake. 2011. Acres Planted per Day and Seeding Rates of Crops Grown in the United States. 

Biological and Economic Analysis Division (BEAD), USEPA. March 11, 2011.
6

Fenamidone Structure

Chemical Abstracts Registry Number (CAS): 161326-34-7

Empirical Formula: C17H17N3OS

Chemical Abstract Registry Names:

(S)-3,5-dihydro-5-methyl-2-methylthio-5-phenyl-3- phenylamino-4H-imidazole-4-one;

(+)-(4S)-4-Methyl-2-methylthio-4-phenyl-(1H)-1-phenylamino-2- imidazolin-5-one

(5S)-3,5-dihydro-5-methyl-2-(methylthio)-5-phenyl-3-(phenylamino)-4H-imidazol-4-one

IUPAC Names:

(+)-4-methyl-2-methylthio-4-phenyl-1-phenylaminoimidazol-1H-5-one;

(S)-5-Methyl-2- methylthio-5-phenyl-3-phenylamino-3,5-dihyroimidazol-4-one 

(S)-1-anilino-4-methyl-2-methylthio-4-phenylimidazolin-5-one

USEPA/OPP Chemical Database:

Imidazol-4-one,3,5-dihydro-5-methyl-2-(methylthio)-5-phenyl-3- (phenylamino)-, (5S)-)

Other Names:

4H-Imidazol-4-one, 3,5-dihydro-5-methyl-2-(methylthio)-5-phenyl-3-(phenylamino)-, (5S)-

4H-Imidazol-4-one, 3,5-dihydro-5-methyl-2-(methylthio)-5-phenyl-3-(phenylamino)-, (S)-

S-5-Methyl-2-methylthio-5-phenyl-3-phenylamino-3,5-dihydro-4H-imidazol-4-one

Figure 1 Chemical Structure, CAS No., Empirical Formula, and Chemicals for Fenamidone.

Environmental Fate Summary

The environmental fate for fenamidone is discussed in detailed in the new chemical assessment

USEPA (20025) and is summarized below.

The major route of degradation for fenamidone in the environment is biotransformation under 

aerobic conditions. Fenamidone is moderately mobile and appears to degrade faster in aerobic 

soils (half-lives 5 to 8 days) than in aerobic water-sediment systems (half-lives 67 to 128 days). 

Fenamidone is very stable in anaerobic sediments (half-lives > 1,000 days). In the environmental 

pH range of 5 to 9, fenamidone is stable towards abiotic hydrolysis. Although direct photolysis 

occurred rapidly in laboratory studies (half-lives 5 to 6 days) direct photolysis in natural water 

would be only significant in clear, shallow water. The role of indirect photolysis is not known. 

 

5 USEPA, 2002. New Chemical, Environmental and Ecological Risk Assessment for Fenamidone and its end-use product Reason 

500 SC. (D282668, October 2, 2002) 
7

Fenamidone poses low concern for volatilization from soil or water and is unlikely to 

bioaccumulate in fish.

The major, terminal metabolite is the cleavage product (S)-Methyl-5-phenylimidazolidine-2,4-

dione (RPA-412636). It can form in aerobic water, aerobic soils, and water-sediment systems,

and is a persistent chemical species (aerobic soil half-lives as long as 462 days). In addition, 

RPA-412636 and its immediate precursor RPA-417208 (cleavage product) are very mobile in 

soil and can leach to groundwater or be transported to surface water by runoff or spray drift, 

where they predominantly partition into the water column. The degradates of concern [and 

studies where they are formed] are RPA-412636, RPA-411639, RPA-413255 [aerobic soil 

metabolism, aerobic water-sediment systems, and terrestrial field dissipation], RPA-4127086 

[hydrolysis @ pH 4; 9 and photolysis], and RPA-409446 and RP- 410995 [aerobic soil 

metabolism]. The summary of degradation processes are found in Appendix 1, Table 1, and the 

structures are shown in Appendix 1, Table 2.

Hydrolysis was determined not a major degradation pathway, but it is faster at pHs below 5 and 

above 9 (New Chemical Review, D282668, October 2, 2002). Assuming pseudo first order 

kinetics the half-lives of 41.8 days, 223 days, 407 days, and 27.2 days at pH 4, 5, 7, and 9, 

respectively, were estimated (MRID 453858-29). EFED has observed that PRZM-GW is more

sensitive to pH, even with long half-lives, compared to surface water (PRZM/EXAMS).

The fenamidone degradation products exhibit properties in common with other pesticide residues 

that are known to dissolve in runoff water to reach surface water bodies and leach to 

groundwater. Furthermore, fenamidone residues may also reach surface water bodies via erosion 

or through spray drift. 

Residues of Concern

Throughout this document, fenamidone and its metabolites/ degradates (Appendix 1 Table 1) are 

named by the company code assigned only to the S-enantiomer. The company code for 

fenamidone is RPA 407213. On May 25, 20047, the Metabolism Assessment Review Committee 

(MARC) recommended that, besides parent fenamidone, the additional metabolites/degradation 

products RPA-412636, RPA-412708, RPA-411639, RPA-413255, RPA-409446, and RP410995 [i.e., total fenamidone residues] should be included in the drinking water assessment 

(Appendix 1 Tables 1 and 2).

Drinking Water Modeling

EFED exposure models were used to estimate the drinking water exposure concentrations for use 

in the dietary risk assessment of fenamidone. The estimated drinking water concentrations 

(EDWC) for fenamidone and its residues (total fenamidone residues, TTR) of concern in surface 

water (Table 7) were estimated using Tier II models (linked PRZM and EXAMS by PE5). 

 

6

Some documents have listed this degradate as RPA-412108.

7 TXR No. 0052287
8

Tier I and II groundwater EDWCs for fenamidone residues for the proposed new uses were 

derived with PRZM-GW (Pesticide Root Zone Model for Groundwater, version 1.0, August 31, 

2012), using the GW-GUI (Graphical User Interface, version 1.0, August 31, 2012). PRZM-GW 

is a one-dimensional, finite-difference model that estimates the concentrations of pesticides in 

groundwater. It accounts for pesticide fate in the crop root zone by simulating pesticide transport 

and degradation through the soil profile after a pesticide is applied to an agricultural field. 

PRZM-GW permits the assessment of multiple years of pesticide application (up to 30 years) on 

a single site. Six standard scenarios, each representing a different region known to be vulnerable 

to groundwater contaminations, are available for use with PRZM-GW for risk assessment 

purposes. In the PRZM-GW simulations, each of these standard scenarios was used. PRZM-GW 

output values represent pesticide concentrations in a vulnerable groundwater supply that is 

located directly beneath a rural agricultural field. Note that, unlike in surface water modeling, 

PCAs are not used with PRZM-GW per EFED guidance. Estimates from PRZM-GW are 

presented in Table 8.

For comparison purposes, EDWCs were also calculated (Table 9) using the Screening 

Concentration in Ground Water model (SCI-GROW v2.3, compiled 08/08/03). SCI-GROW was 

developed by fitting a linear model to ground water concentrations with the Relative Index of 

Leaching Potential (RILP) as the independent variable. Ground water concentrations were taken 

from 90-day average high concentrations from Prospective Ground Water studies. The RILP is a 

function of aerobic soil metabolism and the soil-water partition coefficient. There is no PCA 

adjustment for SCI-GROW. The output of SCI-GROW represents the concentrations of 

fenamidone total residues that might be expected in shallow unconfined aquifers under sandy

soils. 

The input parameters were selected from the physical/chemical properties and environmental 

fate data submitted by the registrant to support registration of fenamidone. Input parameters were 

selected in accordance with US EPA-OPP EFED water model parameter selection guidelines, 

Guidance for Selecting Input Parameters in Modeling the Environmental Fate and Transport of 

Pesticides8and PRZM-GW Input Parameter Guidance9. Detailed information about the models, 

selection of input parameters and scenarios can be obtained from 

http://www.epa.gov/oppefed1/models/water/index.htm

The drinking water exposure assessment for total fenamidone residues is based on modeling. 

Modeling for individual residues was not conducted due to lack of environmental fate data. 

Monitoring data were not available to assess total fenamidone residue concentrations in surface 

and ground source waters. Because the modeling approach requires use of the cumulative residue 

degradation half-lives as well as the lowest soil:water partitioning coefficient for fenamidone, the 

estimated concentration in drinking water are expected to be conservative. 

 

8 Parameters are selected as per Guidance for Selecting Input Parameters in Modeling the Environmental Fate and 

Transport of Pesticides; Version 2.1, October 22, 2009.

9 Baris, R.; Barrett, M.; Bohaty, R.; Echeverria, M.; Kennedy, I.; Malis, G.; Wolf, J.; Young, D. PRZM-GW Input Parameter 

Guidance; Health Canada, U.S. Environmental Protection Agency, October 12, 2012
9

Fenamidone Total Residues Modeling Input Parameters

The modeling of total fenamidone residues, or total toxic residues (TTR), requires recalculation 

of cumulative fenamidone residue half-lives from laboratory degradation studies. Recalculation 

of aerobic soil metabolism half-lives was conducted (see USEPA, 200710) using the summed 

concentration (expressed as % of applied parent) for parent fenamidone and its degradation 

products (RPA-412636, RPA-412708, RPA-411639, RPA-413255, RPA-409446, RPA410995)6,11

. 

The mobility of total fenamidone residues (TTR) is based on the compound with the lowest 

soil:water partitioning coefficient. This approach was used to provide a conservative assessment 

of mobility for the fenamidone residues. Batch equilibrium partition coefficients of fenamidone 

and its degradation products are shown in Table 3. The batch equilibrium partition coefficient for 

RPA-412636 was used to represent mobility of total fenamidone residues.

Table 3: Batch Equilibrium Coefficients for Fenamidone and Its Degradation Products

Company Code Average Koc

(mL/goc)

Data Source

Fenamidone 368 MRID 45385823

RPA-412636 26 MRID 45385824

RPA-412708a31 MRID 45385825

RPA-411639 611 MRID 45385826

RPA-413255 458 MRID 45385827

RPA-409446 No Data

RPA- 410995 No Data

a May be referred to RPA-412108 in some EFED documents.

The environmental fate data used for model inputs (Table 4) are the same as used in the previous 

drinking water assessment (USEPA, 2007) and followed EFED input guidance.

Table 4. PRZM/EXAMS and PRZM-GW Input Parameters for Total Toxic Fenamidone Residues

Model Parameter Value Reference

Molecular Weight (g/moles) 311.4 Calculated (MRID 45385704)

Henry’s Law Constant (atm-m3/mol) 1.37E-10 Estimated used value for parent

Vapor Pressure (torr) 2.6E-9 Product Chemistry Data used value 

for parent

Solubility (mg/L) 7.8 Product Chemistry Data used value 

for parent

Koc (L/mg-OC)a26a MRID 45385824

Photolysis Half-life (days) 5.4 MRID 45385830, 45385831

Hydrolysis @ pH 7 (days)a407a MRID 45385829

Aerobic Soil Half-life (days) ( for TTR)aStablea MRID 45385819

 

10 USEPA, 2007. Drinking Water Assessment for New Uses. (D332878, D316085, D316083; May 14, 2007).

11 http://www.gpo.gov/fdsys/pkg/FR-2009-07-15/pdf/E9-16817.pdf
10

Model Parameter Value Reference

Aerobic Aquatic Half-life (days) 137.78 MRID 45385821, 45385822

Anaerobic Aquatic Half-life (days) 1386.29 MRID 4540003

a

Inputs considered in PRZM-GW.

.

Previous Drinking Water Assessments

A drinking water assessment [January 28, 2004 (DP D294195, D 292900)] was previously

conducted for uses on lettuce, potato, sweet potato, tomato, bulb vegetables, and cucurbits. This 

assessment considered fenamidone and its major metabolite RPA-412636. On May 25, 200412

the Metabolism Assessment Review Committee (MARC) recommended that, besides parent 

fenamidone, additional metabolites should be included in the drinking water assessment 

(Appendix 1 Table 1). A follow-up drinking water assessment for total fenamidone residues was 

conducted in 2007 [USEPA, May 14, 2007] to include the additional metabolites/degradates 

using the total toxic residues (TTR). Total fenamidone residues (or TTR) in surface source 

drinking water for were 41.66 μg/L and 11.88 μg/L, the 1-in-10 year daily peak and annual mean 

concentration, respectively, and 5.99 μg/L the 30-year annual mean concentrations. The total 

fenamidone residue concentration in shallow groundwater was estimated with SCI-GROW to be

178 μg/L.

The environmental fate values and the maximum fenamidone application rates used for modeling 

were the same for this assessment and the previous assessment. Since the application rates are 

the same, the increase in EDWCs for surface water is for the proposed succulent bean use and is 

likely due to differences in the scenarios, pesticide application dates, and the occurrence of 

rainfall events rather than being related to a specific crop. Additionally, the maximum default 

PCA increased slightly from 0.87 to 0.91 in the recent update (USEPA, 201213). For groundwater 

the PRZM-GW model considers 30 years of use whereas SCI-GROW only considers one year of 

pesticide use and did not allow for spatial or temporal differences.

Surface Water

The PRZM scenarios used are summarized in Table 5. The application rates, reapplication 

intervals, and date first application are also given. The proposed modification to the potato label 

would allow for the application of fenamidone as a potato seed treatment in addition to the foliar 

applications. A non-standard modeling approach was used to assess this seed treatment use on 

potato pieces followed with two foliar applications. The modeling of potato seed use would be 

expected to be similar to that of an in-furrow application of a granular pesticide (no spray drift)

so it is assumed that application efficiency is 100 percent and spray drift loss is zero and the 

model setting to account for placement at a specified depth using PRZM chemical application 

method (CAM) is 8. Depth of potato seed plant varied in literature from about 2 inches to 4 

inches (5 to 10 cm). For an incorporation depth of 3-cm or more when PRZM CAM = 8 the

 

12 TXR No. 0052287

13 http://www.epa.gov/oppefed1/models/water/pca_adjustment_dwa.html
11

surface water EDWCs were 0. The foliar applications would assume standard assumptions (spray

drift and incorporation depth) for ground or aerial spray applications.

To evaluate the difference between application method, a single application of fenamidone 

assuming treated potato seed (CAM=8 and incorporation depth was 2 cm) was compared to a 

single foliar application (Table 7). It can be seen that the concentrations from the seed treatment 

application (e.g., 0.84 μg/L) are less than the foliarly applied applications (e.g., 11.78) (Table 7). 

Therefore, qualitatively it would be expected that a the yearly application of fenamidone to 

potatoes with one application as a seed treatment and two by aerial spray applications would 

result in lower EDWCs then with three aerial or ground applications.

Table 5. Crop management PRZM/EXAMS inputs used in aquatic exposure modeling for 

Fenamidone.

PRZM/EXAMS Input Parameter Input Value and Unit

Labeled Crop 

Crop Scenarios

Application Rate

Yearly Rate (Number of Applications)

Retreatment Time Interval

Application Date (month-day)

Potato Foliar

FL Potato, ME Potato

 Application Rate: 0.267 lb a.i./A (0.299 kg ai/ha

 0.80 lb a.i./A per year (3 applications @ max rate)

 5 days between applications

 First Application Date (month-day):

 FL: 03-04

ME: 07-15

Potato Seed Treatment and Foliar Potato

FL Potato, ME Potato

 Potato Seed: 0.245 lb ai./ac (0.274 kg ai/ha)a

 Foliar Application Rate: 0.267 lb a.i./A (0.299 kg ai/ha)

 (1 seed treatment + 2 foliar applications per season)

 0.80 lb a.i./A per year 

 5 days between applications

 Planting Date:

 1

st Application and 2nd Application Date: 

FL: 01-01 FL: 03-04 

FL: 01-01 FL: 03-09

FL: 01-01 FL: 03-14

ME: 07-15 ME : 07-20

Potato Seed Treatment vs Single Foliar Applicationb

FL Potato, ME Potato

 Potato Seed: 0.267 lb ai./ac (0.299 kg ai/ha)a

 Foliar Rate: 0.267 lb a.i./A (0.299 kg ai/ha)

 (1 applications per season)

 Planting Date:

 1

st Application Date: 

FL: 01-01

ME: 04-25

Onions, Bulb Vegetables

GA Onion, CA Onion, WA Onion

 Application Rate: 0.178 lb a.i./A (0.199 kg ai/ha)

 0.71 lb a.i./A per year (4 applications @ max rate)

 5 days between applications

 First Application Date: 

GA: 04-15
12

PRZM/EXAMS Input Parameter Input Value and Unit

CA: 02-01

WA: 07-30

Beans, Succulent

MI Bean, OR Snapbean

 Application Rate: 0.267 lb a.i./A (0.299 kg ai/ha)

 0.80 lb a.i./A per year (3 applications per season)

 5 days between applications

 First Application Dates:

MI: 08-01

OR: 07-01

Ginseng

MN Sugarbeet

 Application Rate: 0.267 lb a.i./A (0.299 kg ai/ha)

 0.80 lb a.i./A per year (3 applications @ max rate)

 3 applications per season at maximum rate

 14 days between applications

 First Application Date: 08-15

MI Asparagus

 Application Rate: 0.267 lb a.i./A ( 0.299 kg ai/ha)

 0.80 lb a.i./A per year (3 applications @ max rate)

 3 applications per season at maximum rate

 14 days between applications

 First Application Date: 08-15

Chemical Application Method (CAM)c Aerial and Ground Applications

CAM = 2, linear foliar based on crop canopy

CAM = 8

d

for potato seed treatment; Incorporation depth set as 2 cm

Application Efficiency Aerial Applications = 0.95

Ground Applications = 0.99

Potato Seed Piece Treatment = 1.0 (same as granular)

Spray Drift Fraction Aerial Applications = 0.16

Ground Applications = 0.064

Potato Seed Piece Treatment = 0.00 (same as granular)

a

Potato seed treatment rate (0.274 kg ai/ha) based upon estimate provide by Registrant (MRID 48977101, pages 6 and 7) EFED 

estimated a potato seed treatment rate of 0.266 kg ai/ha).

b

Single application potato seed treatment and aerial foliar application means to evaluate significance of spray drift.

c CAM also required for PRZM-GW d

Potatoe seed are planted at a depth of 5 to 10 cm, when CAM = 8 was used, any incorporation (planting depth) of > 3 cm, 

EDWCs were 0.

GROUNDWATER

Total fenamidone residues were also estimated in groundwater. Tier I and II groundwater 

EDWCs for fenamidone residues use were derived with PRZM-GW (Pesticide Root Zone Model 

for Groundwater, version 1.0, August 31, 2012), using the GW-GUI (Graphical User Interface, 

version 1.0, August 31, 2012). 

Currently, the environmental fate input parameters are limited to aerobic soil metabolism halflife, hydrolysis, and sorption (Koc) in PRZM-GW (Table 4). Pesticide usage information is 

limited to rate and number of applications, date of application, and chemical application method 

(CAM), foliar or soil applied applications. Spray drift and efficiency are not considered. 

However, wash-off is considered for a foliar application in the same manner as surface water. 
13

The six scenarios (Table 8), currently available with PRZM-GW, developed to represent 

conditions known to be vulnerable to groundwater contamination were also used in this 

assessment.

Previously, concentrations of total residues in groundwater were estimated using the Screening 

Concentration In Ground Water model (SCI-GROW) (Version 2.3). For comparison purposes, 

EDWCs were also calculated using the Screening Concentration in Ground Water model (SCIGROW v2.3, compiled 08/08/03). 

Input parameters for SCI-GROW modeling are shown in Table 6. SCI-GROW does not 

differentiate between method of application, but only considers numbers and rate of application.

Table 6. SCI-GROW Input Parameters for Total Fenamidone

Model Parameter Value Reference

Koc (L/mg-OC) 26 MRID 45385824

Aerobic Soil Half-life (days) 1000 daysa MRID 45385819

a Because the SCI-GROW model requires an input value, a half-life of 1000 days was used as a surrogate half-life for total 

fenamidone residues.

Modeling Results

The EDWCs for total fenamidone residues in surface water for the proposed new uses are 

predicted to be no greater than 49.19 μg/L and 12.96 μg/L, the 1-in-10 year daily peak and

annual mean concentration, respectively, or 8.21 μg/L the 30-year annual mean concentrations

(Table 7). The total fenamidone concentrations vary depending upon the application dates and 

the method of application (e.g., seed treatment or aerial spray) and scenario. The 1-in-10 year 

peak EDWCs ranged from 6.85 to 49.19 μg/L, the 1-in-10 year average concentrations ranged 

from 2.71 to 12.96 μg/L, and the 30 year average concentration ranged from 1.80 to 8.21 μg/L.

Representative model outputs are included in Appendix 3.

Table 7. PRZM/EXAMS Surface Water EDWCs (with PCA = 0.91)

Modeled Use Scenario #apps/rate (lb a.i./A) 1-in-10 year 30-year 

average Peak 10 yr average

Comparison of Seed Potato Treatment vs. a Single Foliar Application [μg/L]

Potato (seed treatment)aFL Potato 1 @ 0.267 0.76 0.11 0.03

Potato (foliar)bFL Potato 1 @ 0.267 10.72 1.63 0.86

Potato (seed treatment)a1 ME Potato 1 @ 0.267 0.56 0.15 0.05

Potato (seed treatment)a2 ME Potato 1 @ 0.267 9.92 2.68 1.26

Potato (foliar)b1 ME Potato 1 @ 0.267 10.53 2.90 1.48

Potato (foliar)b2 ME Potato 1 @ 0.267 9.92 2.68 1.26

Proposed New Uses and Potato Seed Treatment

Potato (foliar)c FL Potato 3 @ 0.267 30.98 5.26 2.78

Potato (foliar)dFL Potato 3 @ 0.267 27.69 5.14 2.79
14

Modeled Use Scenario #apps/rate (lb a.i./A) 1-in-10 year 30-year 

average Potato (foliar)e

FL Potato 3 @ 0.267 36.31 5.36 2.72

Potato (foliar no drift)fFL Potato 3 @ 0.267 35.38 4.97 2.19

Potato (foliar no drift)

g ME Potato 3 @ 0.267 16.53 5.80 2.32

Potato (foliar)h ME Potato 3 @ 0.267 19.85 6.93 1.80

Potato (foliar)iFL Potato 3 @ 0.267 42.82 5.93 2.28

Potato (foliar no drift)jFL Potato 3 @ 0.267 44.10 6.27 2.80

Onions (Bulb Vegetables) CA Onion 4 @ 0.178 6.85 2.71 1.99

“ GA Onion 4 @ 0.178 26.20 4.08 1.98

“ WA Onion 4 @ 0.178 9.62 4.55 2.93

Beans (Succulent) MI Bean 3 @ 0.267 49.19 12.96 8.21

“ OR Snap bean 3 @ 0.267 23.40 5.23 2.45

Ginseng MN Sugarbeet 3 @ 0.267 31.23 10.70 7.23

“ MI Asparagus 3 @ 0.267 9.80 4.94 3.48

a Treated potato seed applied via CAM = 8, 2 cm depth of incorporation; no drift and application efficiency = 1.0.

b Applied via CAM = 2; drift =0.16 and application efficiency = 0.95

a1 Application Date: 07-15; Treated potato seed applied via CAM = 8, 2 cm depth of incorporation; no drift and application 

efficiency = 1.0.

a2 Application Date: 04-25; Treated potato seed applied via CAM = 8, 2 cm depth of incorporation; no drift and application 

efficiency = 1.0.

b1 Application Date: 07-15; Treated potato seed applied via CAM = 2, 2 cm depth of incorporation; drift=0.16 and application 

efficiency = 0.95.

b2 Application Date: 04-25; Treated potato seed applied via CAM = 2, 2 cm depth of incorporation; drift=0.16 and application 

efficiency = 0.95.

c Application dates 01-01; 01-06; 01-11; CAM = 2; drift = 0.16 and application efficiency 0.95.

d Application dates 01-01; 03-04; 03-09; CAM = 2; drift = 0.16 and application efficiency 0.95.

e Application dates 01-01; 03-09; 03-14; CAM = 2; drift = 0.16 and application efficiency 0.95.

f Application dates 01-01; 03-14; 03-19; CAM = 2; drift = 0.00 and application efficiency 1.00.

g Application dates 07-15; 07-20; 07-25; CAM = 2; drift = 0.00 and application efficiency 1.00.

h Application dates 07-15; 07-20; 07-25; CAM = 2; drift = 0.16 and application efficiency 0.95.

i Application dates 03-04; 03-09; 03-14; CAM = 2; drift = 0.16 and application efficiency 0.95.

j Application dates 03-04; 03-09; 03-14; CAM = 2; drift = 0.00 and application efficiency 1.00.

The highest daily total fenamidone residue concentration in shallow groundwater estimated by 

PRZM-GW is 207 μg/L (Table 8). PRZM-GW estimates for peak concentration ranged from 

41.5 to 207.0 μg/L. The post-breakthrough averages (after equilibrium is established) ranged 

from 25.1 to 139 μg/L. Average time to breakthrough ranged from 430 days to 1415 days. Date 

of application had little influence on predicted groundwater EDWCs.

Table 8. PRZM-GW Estimates of Groundwater EECs [μg/L]

Groundwater

Scenario

Application Rate

#apps/rate 

Highest daily value Post Breakthrough 

Average

Average Breakthrough 

Time

(days)

Delmarva 3 @ 0.267 185 120 429

FL Central Ridge 3 @ 0.267 143 95.5 450

FL Potato 3 @ 0.267 111 71.5 792

GA Coastal Plain 3 @ 0.267 41.5 25.1 1415

NC Coastal Plain 3 @ 0.267 84.2 59.7 1263

WI Central Sands 3 @ 0.267 207 139 859
15

The estimated groundwater concentrations from SCI-GROW, which are being presented as a 

comparison to the PRZM-GW estimates during the first year of PRZM-GW implementation, are 

the same as the previous drinking water assessment, i.e., total residue concentration of 178 μg/L, 

as no additional environmental fate data are available and the yearly maximum applications rates 

have remained the same. The probable reason that the SCI-GROW estimate and the PRZM-GW 

results are similar is that PRZM-GW includes hydrolysis which is not considered in SCI-GROW. 

Table 9. SCI-GROW Estimated Exposure Concentrations of Total Residues in Drinking Water Drawn from

Groundwater (previous DWA1) and Current Assessment

Use Scenario Total Application Rate 

(lbs ai/A)

Total Residues Concentration 

(μg/L)

Potato (3 foliar)10.801178

Potato (3 apps) current assessment 0.80 178

1 USEPA, 2007; D332878, D316085, D316083, D339503
16

Appendix 1. Metabolite Company Code (ID), Chemical Names, Degradation Process and 

Study where Degradate was observed and Structures.

Appendix 1. Table 1. Recommended metabolites for inclusion in the DWA for proposed new uses.

Company 

Code (ID)

Chemical Name Degradation Process and Study where observed

RPA-412636 (S)-Methyl-5-phenylimidazolidine-2,4-dione

CAS Reg. No. 27539-12-4

Cleavage of the -N-N- bond of fenamidone and elimination of

the methylthio group

Aerobic soil and aerobic water-sediment systems; Field

RPA-412708 (5S)-3,5-dihydro-5-methyl-2-(methylthio)-5-

phenyl-4H-imidazole-4-one

CAS Reg. No. 332855-82-0

Cleavage of the -N-N- bond of fenamidone. This metabolite 

may be considered as the immediate precursor to RPA- 412636

Aerobic soil and aerobic water-sediment systems; Hydrolysis 

(pH 4; 9); Photolysis

RPA-411639 (5S)-3,5-5-methyl-2-(methylthio)-3-[(4-

nitrophenyl)amino]-5-phenyl-4H-imidazole4-one

Nitration of the -N-phenyl (anilo) group at the C-4 position 

.Bridge-intact product

Can form RPA- 412708 by cleavage of the 

-N-N- bond

Aerobic soil and aerobic water-sediment systems;

RPA-413255 (5S)-3,5-5-methyl-2-(methylthio)-3-[(2-

nitrophenyl)amino]-5-phenyl-4H-imidazole4-one

Nitration of the -N-phenyl (anilo) group at the C-2 position . 

Bridge-intact product. Can form RPA- 412708 by cleavage of 

the -N-N- bond

Aerobic soil and aerobic water-sediment systems;

RPA-409446 5-Methyl-3-[(4-nitrophenyl)amino-5—2,4-

imidazolidinedione

(The code for the S-enantiomer is RPA221607)

Nitration of the -N-phenyl (anilo) group at C-2 position Bridgeintact product; Elimination of the methylthio group. Can form 

RPA- 412636 by cleavage of the 

-N-N- bond

Aerobic soil metabolism

RP- 410995 5-Methyl-3-[(2-nitrophenyl)amino-5—2,4-

imidazolidinedione

(The code for the S-enantiomer is RPA221701)

Nitration of the -N-phenyl (anilo) group at C-2 position Bridgeintact product; Elimination of the methylthio group. Can form 

RPA- 412636 by cleavage of the -N-N- bond

Aerobic soil metabolism

Appendix 1. Table 2. Chemical Structures

Name Structure

fenamidone; RPA 407213

(5S)-3,5-dihydro-5-methyl-2-(methylthio)-5-phenyl-3-

(phenylamino)-4H-imidazol-4-one

CH3

N

O N S

CH3

HN

*

14C-N-phenyl-fenamidone

CH3

N

O N S

CH3

HN

*

14C-C-phenyl-fenamidone

N

N

CH3

O S

CH3

N

H
17

Name Structure

RPA 408056 (racemic mixture)

RPA 412708 (S-enantiomer)

{note some documents have ID this as RPA 412108}

5-methyl-2-methylthio-5-phenyl-3,5-dihydroimidazol-4-

one

RPA 405862 (racemic mixture)

RPA 410193 (S enantiomer)

5-methyl-5-phenyl-3-phenylamino-imidazolidin-2,4-dione

RPA 717879 (racemic mixture)

RPA 412636 (S-enantiomer)

5-methyl-5-phenylimidazolidine-2,4-dione

RPA 413255

(5S)-5-methyl-2-(methylthio)-3-[(2-nitrophenyl)amino]-5-

phenyl-3,5-dihydro-4H-imidazol-4-one

RPA 410914 (racemic mixture)

RPA 411639

(5S)-5-methyl-2-(methylthio)-3-[(4-nitrophenyl)amino]-5-

phenyl-3,5-dihydro-4H-imidazol-4-one

RPA 406012 (racemic mixture)

RPA 410995

(5S)-5-methyl-3-[(2-nitrophenyl)amino]-5-

phenylimidazolidine-2,4-dione

RPA 409446

(5S)-5-methyl-3-[(4-nitrophenyl)amino]-5-

phenylimidazolidine-2,4-dione

RPA 407213-dimer

(5S,5'S)-3,3'-(1,2-diphenylhydrazine-1,2-diyl)bis[5-

methyl-2-(methylthio)-5-phenyl-3,5-dihydro-4Himidazol-4-one]

N

N

CH3

O S

CH3

H

N

H

N

CH3

O O

N

H

N

H

N

CH3

O O

H
18

Name Structure

aniline
19

Appendix 2. Modeling Assumptions and Concentrations not adjusted by PCA.

PE5 does not easily allow for mixed application methods (seed treatment with foliar 

applications) although PRZM does). To qualitatively evaluate the difference, one application of 

fenamidone as a potato seed (chemical application method (CAM) = 8, incorporation depth = 2 

cm, drift = 0.0, efficiency = 100%) and one foliar application as an aerial spray (CAM = 2, drift 

= 0.16 an application efficiency = 95%) were run for each potato scenario (Appendix 2 Table 1). 

CAM = 8 allows for the placement (incorporation) of the pesticide (i.e., seed potato) at a 

specified depth. When CAM =8, incorporation depths greater than 4 cm results in EDWCs of 

0.0 concentration. As expected the concentrations from the seed treatments (0.84 and 0.77 μg/L) 

are less than the singular foliar application (11.78 and 11.57 μg/L). To considered the different 

application dates associated with the different methods of application (seed treatment vs foliar) 

combinations of different application dates were also considered (Appendix 2 Table 1). 

PRZM/EXAMs total fenamidone concentrations not adjusted by the PCA are given in Appendix 

2 Table 1.

Appendix 2 Table 1. PRZM/EXAMS Surface Water EECs [μg/L](without PCA)

Crop Scenario #apps/rate (lb 

a.i./A)

1-in-10 year Long-term

Peak Average 30-year 

Average

Comparison of Potato Seed Treatment vs Single Foliar Application

Potato (seed treatment)aFL Potato 1 @ 0.267 0.84 0.12 0.03

Potato (foliar)bFL Potato 1 @ 0.267 11.78 1.79 0.94

Potato (seed treatment)a1 ME Potato 1 @ 0.267 0.77 0.19 0.08

Potato (seed treatment)a2 ME Potato 1 @ 0.267 0.62 0.16 0.05

Potato (foliar)b1 ME Potato 1 @ 0.267 11.57 3.19 1.63

Potato (foliar)b2 ME Potato 1 @ 0.267 10.90 2.95 1.38

Potato (foliar)cFL Potato 3 @ 0.267 34.04 5.78 3.06

Potato (foliar)dFL Potato 3 @ 0.267 30.43 5.65 3.07

Potato (foliar)eFL Potato 3 @ 0.267 39.90 5.89 2.99

Potato (foliar no drift)

f

FL Potato 3 @ 0.267 38.88 5.46 2.41

Potato (foliar no drift)

g ME Potato 3 @ 0.267 18.16 6.37 2.55

Potato (foliar)h ME Potato 3 @ 0.267 21.81 7.62 1.98

Potato (foliar)iFL Potato 3 @ 0.267 47.06 6.52 2.51

Potato (foliar no drift)jFL Potato 3 @ 0.267 48.46 6.89 3.08

Three Aerial Foliar Applications

Onions (Bulb Vegetables) CA Onion 4 @ 0.178 7.53 2.98 2.19

“ GA Onion 4 @ 0.178 28.79 4.48 2.18

“ WA Onion 4 @ 0.178 10.57 5.00 3.22

Beans (Succulent) MI Bean 3 @ 0.267 54.05 14.24 9.02

“ OR Snap bean 3 @ 0.267 25.71 5.75 2.69

Ginseng MN Sugarbeet 3 @ 0.267 34.32 11.76 7.94

“ MI Asparagus 3 @ 0.267 10.77 5.43 3.82
20

a Treated potato seed applied via CAM = 8, 2 cm depth of incorporation; no drift and application efficiency = 1.0.

b Applied via CAM = 2; drift =0.16 and application efficiency = 0.95

a1 Application Date: 07-15; Treated potato seed applied via CAM = 8, 2 cm depth of incorporation; no drift and application 

efficiency = 1.0.

a2 Application Date: 04-25; Treated potato seed applied via CAM = 8, 2 cm depth of incorporation; no drift and application 

efficiency = 1.0.

b1 Application Date: 07-15; Treated potato seed applied via CAM = 2, 2 cm depth of incorporation; drift=0.16 and application 

efficiency = 0.95.

b2 Application Date: 04-25; Treated potato seed applied via CAM = 2, 2 cm depth of incorporation; drift=0.16 and application 

efficiency = 0.95.

c Application dates 01-01; 01-06; 01-11; CAM = 2; drift = 0.16 and application efficiency 0.95.

d Application dates 01-01; 03-04; 03-09; CAM = 2; drift = 0.16 and application efficiency 0.95.

e Application dates 01-01; 03-09; 03-14; CAM = 2; drift = 0.16 and application efficiency 0.95.

f Application dates 01-01; 03-14; 03-19; CAM = 2; drift = 0.00 and application efficiency 1.00.

g Application dates 07-15; 07-20; 07-25; CAM = 2; drift = 0.00 and application efficiency 1.00

h Application dates 07-15; 07-20; 07-25; CAM = 2; drift = 0.16 and application efficiency 0.95.

i Application dates 03-04; 03-09; 03-14; CAM = 2; drift = 0.16 and application efficiency 0.95.

j Application dates 03-04; 03-09; 03-14; CAM = 2; drift = 0.00 and application efficiency 1.00.
21

Appendix 3. Representative Model Outputs for PRZM/EXAMS (PE5), PRZM-GW, and 

SCI-GROW.

stored as MIbean.out

Chemical: fenamidone

PRZM environment: MIbeansSTD.txt modified Tueday, 29 May 2007 at 13:56:44

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

Metfile: w14826.dvf modified Tueday, 26 August 2008 at 06:15:04

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 54.22 53.04 50.01 41.98 37.01 11.78

1962 16.68 16.43 15.42 13.41 12.11 6.878

1963 18.74 18.34 17.34 15.05 13.41 5.319

1964 14.26 13.97 13 11.67 10.66 5.283

1965 52.47 51.33 46.88 39.07 34.47 12.55

1966 15.19 14.96 14.05 12.22 11.01 8.032

1967 22.03 21.56 19.79 17.25 15.57 6.682

1968 134 131 120 99.04 87.18 29.88

1969 38.12 37.55 35.25 30.67 27.7 14.32

1970 30.33 29.66 27.31 23.98 21.51 8.795

1971 10.21 10.05 9.437 8.211 7.623 5.639

1972 17.98 17.59 16.15 13.79 12.27 5.358

1973 30.43 29.8 27.68 23.41 20.82 8.36

1974 12.28 12.09 11.35 9.862 9.273 6.706

1975 101 98.76 91.66 76.89 67.83 22.59

1976 30.78 30.31 28.46 24.75 22.3 13.52

1977 11.39 11.17 10.34 8.799 8.476 5.319

1978 12.57 12.37 11.55 10.55 9.857 4.762

1979 10.5 10.27 9.388 8.108 7.376 3.942

1980 12.52 12.24 11.42 10.21 9.256 4.038

1981 16.48 16.16 15.02 13.05 11.74 5.243

1982 20.57 20.12 18.45 16.14 14.41 6.403

1983 16.11 15.74 14.49 13.36 12.25 6.084

1984 15.94 15.58 14.67 13.08 12.04 5.719

1985 47.53 46.5 43.44 36.54 32.31 11.79

1986 38.69 37.86 35.49 30.73 27.35 13.24

1987 21.76 21.28 20.16 17.44 15.69 9.06

1988 28.1 27.45 25.46 21.48 19.1 8.353

1989 20.4 19.96 19.1 16.59 14.92 7.405

1990 24.77 24.22 22.26 19.24 17.09 7.406

Sorted results

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

0.032258064516129 134 131 120 99.04 87.18 29.88

0.0645161290322581 101 98.76 91.66 76.89 67.83 22.59

0.0967741935483871 54.22 53.04 50.01 41.98 37.01 14.32

0.129032258064516 52.47 51.33 46.88 39.07 34.47 13.52

0.161290322580645 47.53 46.5 43.44 36.54 32.31 13.24

0.193548387096774 38.69 37.86 35.49 30.73 27.7 12.55

0.225806451612903 38.12 37.55 35.25 30.67 27.35 11.79

0.258064516129032 30.78 30.31 28.46 24.75 22.3 11.78

0.290322580645161 30.43 29.8 27.68 23.98 21.51 9.06

0.32258064516129 30.33 29.66 27.31 23.41 20.82 8.795

0.354838709677419 28.1 27.45 25.46 21.48 19.1 8.36

0.387096774193548 24.77 24.22 22.26 19.24 17.09 8.353

0.419354838709677 22.03 21.56 20.16 17.44 15.69 8.032

0.451612903225806 21.76 21.28 19.79 17.25 15.57 7.406

0.483870967741936 20.57 20.12 19.1 16.59 14.92 7.405
22

0.516129032258065 20.4 19.96 18.45 16.14 14.41 6.878

0.548387096774194 18.74 18.34 17.34 15.05 13.41 6.706

0.580645161290323 17.98 17.59 16.15 13.79 12.27 6.682

0.612903225806452 16.68 16.43 15.42 13.41 12.25 6.403

0.645161290322581 16.48 16.16 15.02 13.36 12.11 6.084

0.67741935483871 16.11 15.74 14.67 13.08 12.04 5.719

0.709677419354839 15.94 15.58 14.49 13.05 11.74 5.639

0.741935483870968 15.19 14.96 14.05 12.22 11.01 5.358

0.774193548387097 14.26 13.97 13 11.67 10.66 5.319

0.806451612903226 12.57 12.37 11.55 10.55 9.857 5.319

0.838709677419355 12.52 12.24 11.42 10.21 9.273 5.283

0.870967741935484 12.28 12.09 11.35 9.862 9.256 5.243

0.903225806451613 11.39 11.17 10.34 8.799 8.476 4.762

0.935483870967742 10.5 10.27 9.437 8.211 7.623 4.038

0.967741935483871 10.21 10.05 9.388 8.108 7.376 3.942

0.1 54.045 52.869 49.697 41.689 36.756 14.24

Average of yearly averages: 9.0152

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: MIbean

Metfile: w14826.dvf

PRZM scenario: MIbeansSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: fenamidone

Description Variable Name Value Units Comments

Molecular weight mwt 311.4 g/mol

Henry's Law Const.henry 1.37e-10 atm-m^3/mol

Vapor Pressure vapr 2.6e-9 torr

Solubilitysol 7.8 mg/L

Kd Kd mg/L

Koc Koc 26 mg/L

Photolysis half-life kdp 5.4 days Half-life

Aerobic Aquatic Metabolism kbacw 137.78 days Halfife

Anaerobic Aquatic Metabolism kbacs 1386.29 days Halfife

Aerobic Soil Metabolism asm 0 days Halfife

Hydrolysis: pH 7 407 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI cm

Application Rate: TAPP 0.299 kg/ha

Application Efficiency: APPEFF 0.95 fraction

Spray Drift DRFT 0.16 fraction of application rate applied to pond

Application Date Date 1-8 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 5 days Set to 0 or delete line for single app.

app. rate 1 apprate 0.299 kg/ha

Interval 2 interval 5 days Set to 0 or delete line for single app.

app. rate 2 apprate 0.299 kg/ha

Record 17: FILTRA

IPSCND 1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFFtotal none, monthly or total(average of entire run)
23

SEED TREATMENT CAM = 8, depth placement 3 cm

stored as FLpotatoST3.out

Chemical: fenamidone

PRZM environment: FLpotatoNMC.txt modified Thuday, 14 June 2007 at 11:15:58

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

Metfile: w13889.dvf modified Tueday, 26 August 2008 at 06:14:40

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 0 0 0 0 0 0

1962 0 0 0 0 0 0

1963 0 0 0 0 0 0

1964 0 0 0 0 0 0

1965 0 0 0 0 0 0

1966 0 0 0 0 0 0

1967 0 0 0 0 0 0

1968 0 0 0 0 0 0

1969 0 0 0 0 0 0

1970 0 0 0 0 0 0

1971 0 0 0 0 0 0

1972 0 0 0 0 0 0

1973 0 0 0 0 0 0

1974 0 0 0 0 0 0

1975 0 0 0 0 0 0

1976 0 0 0 0 0 0

1977 0 0 0 0 0 0

1978 0 0 0 0 0 0

1979 0 0 0 0 0 0

1980 0 0 0 0 0 0

1981 0 0 0 0 0 0

1982 0 0 0 0 0 0

1983 0 0 0 0 0 0

1984 0 0 0 0 0 0

1985 0 0 0 0 0 0

1986 0 0 0 0 0 0

1987 0 0 0 0 0 0

1988 0 0 0 0 0 0

1989 0 0 0 0 0 0

1990 0 0 0 0 0 0

Sorted results

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

0.032258064516129 0 0 0 0 0 0

0.0645161290322581 0 0 0 0 0 0

0.0967741935483871 0 0 0 0 0 0

0.129032258064516 0 0 0 0 0 0

0.161290322580645 0 0 0 0 0 0

0.193548387096774 0 0 0 0 0 0

0.225806451612903 0 0 0 0 0 0

0.258064516129032 0 0 0 0 0 0

0.290322580645161 0 0 0 0 0 0

0.32258064516129 0 0 0 0 0 0

0.354838709677419 0 0 0 0 0 0

0.387096774193548 0 0 0 0 0 0

0.419354838709677 0 0 0 0 0 0

0.451612903225806 0 0 0 0 0 0

0.483870967741936 0 0 0 0 0 0

0.516129032258065 0 0 0 0 0 0

0.548387096774194 0 0 0 0 0 0

0.580645161290323 0 0 0 0 0 0

0.612903225806452 0 0 0 0 0 0

0.645161290322581 0 0 0 0 0 0
24

0.67741935483871 0 0 0 0 0 0

0.709677419354839 0 0 0 0 0 0

0.741935483870968 0 0 0 0 0 0

0.774193548387097 0 0 0 0 0 0

0.806451612903226 0 0 0 0 0 0

0.838709677419355 0 0 0 0 0 0

0.870967741935484 0 0 0 0 0 0

0.903225806451613 0 0 0 0 0 0

0.935483870967742 0 0 0 0 0 0

0.967741935483871 0 0 0 0 0 0

0.1 0 0 0 0 0 0

Average of yearly averages: 0

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: FLpotatoST3

Metfile: w13889.dvf

PRZM scenario: FLpotatoNMC.txt

EXAMS environment file: ir298.exv

Chemical Name: fenamidone

Description Variable Name Value Units Comments

Molecular weight mwt 311.4 g/mol

Henry's Law Const.henry 1.37e-10 atm-m^3/mol

Vapor Pressure vapr 2.6e-9 torr

Solubilitysol 7.8 mg/L

Kd Kd mg/L

Koc Koc 26 mg/L

Photolysis half-life kdp 5.4 days Half-life

Aerobic Aquatic Metabolism kbacw 137.78 days Halfife

Anaerobic Aquatic Metabolism kbacs 1386.29 days Halfife

Aerobic Soil Metabolism asm 0 days Halfife

Hydrolysis: pH 7 407 days Half-life

Method: CAM 8 integer See PRZM manual

Incorporation Depth: DEPI 3 cm

Application Rate: TAPP 0.299 kg/ha

Application Efficiency: APPEFF 1.0 fraction

Spray Drift DRFT 0 fraction of application rate applied to pond

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

Record 17: FILTRA

IPSCND 1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFFtotal none, monthly or total(average of entire run)
25

SEED TREATMENT, CAM = 8, Incorporation depth = 2 cm

stored as FLpotatoST.out

Chemical: fenamidone

PRZM environment: FLpotatoNMC.txt modified Thuday, 14 June 2007 at 11:15:58

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

Metfile: w13889.dvf modified Tueday, 26 August 2008 at 06:14:40

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 0.0192 0.01858 0.01592 0.01141 0.00908 0.002663

1962 0.1225 0.1179 0.1047 0.07567 0.06046 0.01779

1963 0.253 0.2446 0.2094 0.1552 0.126 0.03748

1964 0.1479 0.1433 0.1238 0.08952 0.07167 0.02113

1965 0.0192 0.01847 0.01622 0.0117 0.009315 0.00273

1966 0.003978 0.003871 0.003437 0.002708 0.002261 0.0006923

1967 0.1476 0.1434 0.1232 0.08876 0.07092 0.02084

1968 0.03033 0.0292 0.02496 0.01916 0.01574 0.004725

1969 0.1542 0.1484 0.1267 0.09189 0.07395 0.02191

1970 0.06951 0.06694 0.05741 0.04354 0.03516 0.01044

1971 0.2233 0.2153 0.1847 0.1329 0.1066 0.0316

1972 0.1867 0.1794 0.1567 0.1145 0.09169 0.02701

1973 0.1319 0.1269 0.1085 0.07828 0.06253 0.01851

1974 0.007785 0.007488 0.006387 0.004702 0.003836 0.001158

1975 0.04413 0.04243 0.03755 0.02717 0.02171 0.006398

1976 0.5496 0.5292 0.4535 0.3286 0.2624 0.07726

1977 0.3145 0.3031 0.2606 0.1893 0.1517 0.04495

1978 0.2102 0.2025 0.1845 0.1377 0.1109 0.03291

1979 1.021 0.9836 0.8691 0.6409 0.515 0.1527

1980 0.002787 0.002696 0.002483 0.001919 0.001631 0.0005435

1981 0.02415 0.02325 0.01992 0.01599 0.01331 0.004039

1982 0.1021 0.09822 0.08463 0.06093 0.05005 0.0151

1983 1.044 1.006 0.8832 0.6452 0.5181 0.1542

1984 0.008113 0.007853 0.006936 0.005131 0.004142 0.001315

1985 0.08296 0.07992 0.07129 0.05249 0.04194 0.01228

1986 0.1387 0.1343 0.1178 0.08517 0.06811 0.02011

1987 0.1826 0.1779 0.1529 0.1105 0.08855 0.02645

1988 0.8708 0.8402 0.7212 0.5219 0.418 0.1233

1989 0.02258 0.02172 0.01852 0.01544 0.01271 0.003869

1990 0.003979 0.003826 0.003259 0.002336 0.001862 0.0005491

Sorted results

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

0.032258064516129 1.044 1.006 0.8832 0.6452 0.5181 0.1542

0.0645161290322581 1.021 0.9836 0.8691 0.6409 0.515 0.1527

0.0967741935483871 0.8708 0.8402 0.7212 0.5219 0.418 0.1233

0.129032258064516 0.5496 0.5292 0.4535 0.3286 0.2624 0.07726

0.161290322580645 0.3145 0.3031 0.2606 0.1893 0.1517 0.04495

0.193548387096774 0.253 0.2446 0.2094 0.1552 0.126 0.03748

0.225806451612903 0.2233 0.2153 0.1847 0.1377 0.1109 0.03291

0.258064516129032 0.2102 0.2025 0.1845 0.1329 0.1066 0.0316

0.290322580645161 0.1867 0.1794 0.1567 0.1145 0.09169 0.02701

0.32258064516129 0.1826 0.1779 0.1529 0.1105 0.08855 0.02645

0.354838709677419 0.1542 0.1484 0.1267 0.09189 0.07395 0.02191

0.387096774193548 0.1479 0.1434 0.1238 0.08952 0.07167 0.02113

0.419354838709677 0.1476 0.1433 0.1232 0.08876 0.07092 0.02084

0.451612903225806 0.1387 0.1343 0.1178 0.08517 0.06811 0.02011

0.483870967741936 0.1319 0.1269 0.1085 0.07828 0.06253 0.01851

0.516129032258065 0.1225 0.1179 0.1047 0.07567 0.06046 0.01779

0.548387096774194 0.1021 0.09822 0.08463 0.06093 0.05005 0.0151

0.580645161290323 0.08296 0.07992 0.07129 0.05249 0.04194 0.01228

0.612903225806452 0.06951 0.06694 0.05741 0.04354 0.03516 0.01044

0.645161290322581 0.04413 0.04243 0.03755 0.02717 0.02171 0.006398
26

0.67741935483871 0.03033 0.0292 0.02496 0.01916 0.01574 0.004725

0.709677419354839 0.02415 0.02325 0.01992 0.01599 0.01331 0.004039

0.741935483870968 0.02258 0.02172 0.01852 0.01544 0.01271 0.003869

0.774193548387097 0.0192 0.01858 0.01622 0.0117 0.009315 0.00273

0.806451612903226 0.0192 0.01847 0.01592 0.01141 0.00908 0.002663

0.838709677419355 0.008113 0.007853 0.006936 0.005131 0.004142 0.001315

0.870967741935484 0.007785 0.007488 0.006387 0.004702 0.003836 0.001158

0.903225806451613 0.003979 0.003871 0.003437 0.002708 0.002261 0.0006923

0.935483870967742 0.003978 0.003826 0.003259 0.002336 0.001862 0.0005491

0.967741935483871 0.002787 0.002696 0.002483 0.001919 0.001631 0.0005435

0.1 0.83868 0.8091 0.69443 0.50257 0.40244 0.118696

Average of yearly averages: 0.02982173

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: FLpotatoST

Metfile: w13889.dvf

PRZM scenario: FLpotatoNMC.txt

EXAMS environment file: ir298.exv

Chemical Name: fenamidone

Description Variable Name Value Units Comments

Molecular weight mwt 311.4 g/mol

Henry's Law Const.henry 1.37e-10 atm-m^3/mol

Vapor Pressure vapr 2.6e-9 torr

Solubilitysol 7.8 mg/L

Kd Kd mg/L

Koc Koc 26 mg/L

Photolysis half-life kdp 5.4 days Half-life

Aerobic Aquatic Metabolism kbacw 137.78 days Halfife

Anaerobic Aquatic Metabolism kbacs 1386.29 days Halfife

Aerobic Soil Metabolism asm 0 days Halfife

Hydrolysis: pH 7 407 days Half-life

Method: CAM 8 integer See PRZM manual

Incorporation Depth: DEPI 2 cm

Application Rate: TAPP 0.299 kg/ha

Application Efficiency: APPEFF 1.0 fraction

Spray Drift DRFT 0 fraction of application rate applied to pond

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

Record 17: FILTRA

IPSCND 1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFFtotal none, monthly or total(average of entire run)
27

PRZM-GW OUTPUT

Wisconsin Central Sands

Fenamidone (Total Toxic Residues)

Outputs 

Highest Dailey Value (μg/L) = 207 

Simulation Average (μg/L) = 125

Post-Breakthrough Average (μg/L) = 139

Average Breakthrough Time = 958.93 days

Throughputs 12.76

Inputs

Hydrolysis = 407 days

Koc = 26 mL/goc

Aerobic Soil Metabolism = 0 (stable)

3 applications @ 0.267 lb a.i./A (0.299 kg a.i./ha)

PRZM-GW INPUT

7/10/2013 12:16:57 PM; Enter chemical name or descriptive information.; Wisconsin Corn 

- WI Central Sands

User Interface Version: PRZM-GW (Version 1.01)

***Record 3 

 0.76 0.36 0 18 1 1

***Record 6

 0

***Record 8

 1

***Record 9

 1 0.25 90 100 1 10 10 10 0 100

***Record 10

 30

***Record 11

 010561 210761 201061 1

 010562 210762 201062 1
28

 010563 210763 201063 1

 010564 210764 201064 1

 010565 210765 201065 1

 010566 210766 201066 1

 010567 210767 201067 1

 010568 210768 201068 1

 010569 210769 201069 1

 010570 210770 201070 1

 010571 210771 201071 1

 010572 210772 201072 1

 010573 210773 201073 1

 010574 210774 201074 1

 010575 210775 201075 1

 010576 210776 201076 1

 010577 210777 201077 1

 010578 210778 201078 1

 010579 210779 201079 1

 010580 210780 201080 1

 010581 210781 201081 1

 010582 210782 201082 1

 010583 210783 201083 1

 010584 210784 201084 1

 010585 210785 201085 1

 010586 210786 201086 1

 010587 210787 201087 1

 010588 210788 201088 1

 010589 210789 201089 1

 010590 210790 201090 1

***Record 12

Place Holder

***Record 13

 90 1 0 0

***Record 15

Place Holder

***Record 16

 1 561 0 1 4 0.299 1 0

 31 561 0 2 4 0.299 1 0

 5 661 0 2 4 0.299 1 0

 1 562 0 1 4 0.299 1 0

 31 562 0 2 4 0.299 1 0

 5 662 0 2 4 0.299 1 0

 1 563 0 1 4 0.299 1 0

 31 563 0 2 4 0.299 1 0

 5 663 0 2 4 0.299 1 0

 1 564 0 1 4 0.299 1 0

 31 564 0 2 4 0.299 1 0

 5 664 0 2 4 0.299 1 0

 1 565 0 1 4 0.299 1 0

 31 565 0 2 4 0.299 1 0

 5 665 0 2 4 0.299 1 0

 1 566 0 1 4 0.299 1 0

 31 566 0 2 4 0.299 1 0

 5 666 0 2 4 0.299 1 0

 1 567 0 1 4 0.299 1 0

 31 567 0 2 4 0.299 1 0

 5 667 0 2 4 0.299 1 0

 1 568 0 1 4 0.299 1 0

 31 568 0 2 4 0.299 1 0

 5 668 0 2 4 0.299 1 0

 1 569 0 1 4 0.299 1 0

 31 569 0 2 4 0.299 1 0

 5 669 0 2 4 0.299 1 0

 1 570 0 1 4 0.299 1 0
29

 31 570 0 2 4 0.299 1 0

 5 670 0 2 4 0.299 1 0

 1 571 0 1 4 0.299 1 0

 31 571 0 2 4 0.299 1 0

 5 671 0 2 4 0.299 1 0

 1 572 0 1 4 0.299 1 0

 31 572 0 2 4 0.299 1 0

 5 672 0 2 4 0.299 1 0

 1 573 0 1 4 0.299 1 0

 31 573 0 2 4 0.299 1 0

 5 673 0 2 4 0.299 1 0

 1 574 0 1 4 0.299 1 0

 31 574 0 2 4 0.299 1 0

 5 674 0 2 4 0.299 1 0

 1 575 0 1 4 0.299 1 0

 31 575 0 2 4 0.299 1 0

 5 675 0 2 4 0.299 1 0

 1 576 0 1 4 0.299 1 0

 31 576 0 2 4 0.299 1 0

 5 676 0 2 4 0.299 1 0

 1 577 0 1 4 0.299 1 0

 31 577 0 2 4 0.299 1 0

 5 677 0 2 4 0.299 1 0

 1 578 0 1 4 0.299 1 0

 31 578 0 2 4 0.299 1 0

 5 678 0 2 4 0.299 1 0

 1 579 0 1 4 0.299 1 0

 31 579 0 2 4 0.299 1 0

 5 679 0 2 4 0.299 1 0

 1 580 0 1 4 0.299 1 0

 31 580 0 2 4 0.299 1 0

 5 680 0 2 4 0.299 1 0

 1 581 0 1 4 0.299 1 0

 31 581 0 2 4 0.299 1 0

 5 681 0 2 4 0.299 1 0

 1 582 0 1 4 0.299 1 0

 31 582 0 2 4 0.299 1 0

 5 682 0 2 4 0.299 1 0

 1 583 0 1 4 0.299 1 0

 31 583 0 2 4 0.299 1 0

 5 683 0 2 4 0.299 1 0

 1 584 0 1 4 0.299 1 0

 31 584 0 2 4 0.299 1 0

 5 684 0 2 4 0.299 1 0

 1 585 0 1 4 0.299 1 0

 31 585 0 2 4 0.299 1 0

 5 685 0 2 4 0.299 1 0

 1 586 0 1 4 0.299 1 0

 31 586 0 2 4 0.299 1 0

 5 686 0 2 4 0.299 1 0

 1 587 0 1 4 0.299 1 0

 31 587 0 2 4 0.299 1 0

 5 687 0 2 4 0.299 1 0

 1 588 0 1 4 0.299 1 0

 31 588 0 2 4 0.299 1 0

 5 688 0 2 4 0.299 1 0

 1 589 0 1 4 0.299 1 0

 31 589 0 2 4 0.299 1 0

 5 689 0 2 4 0.299 1 0

 1 590 0 1 4 0.299 1 0

 31 590 0 2 4 0.299 1 0

 5 690 0 2 4 0.299 1 0

***Record 17
30

 0 1 0

***Record 18

 0 0 0.5

***Record 19

Place Holder

***Record 20

 1000 0 0 0 0 0 2 1 1 0

***Record 26

 0 0 0

***Record 27

 3 0.1 0.7 4.0

***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

 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6

***Record 32A

 2.00 25.0

***Record 33

 8

*** Record 34,36,37 Horizon 1

 1 10 1.63 0.088 0 0 0

 0.0017 0 0

 1 0.088 0.034 0.46 0.1196

 5.6 95 2.3 0 0

*** Record 34,36,37 Horizon 2

 2 10 1.63 0.088 0 0 0

 0.0017 0 0

 5 0.088 0.034 0.46 0.1196

 5.6 95 2.3 0 0

*** Record 34,36,37 Horizon 3

 3 20 1.68 0.079 0 0 0

 0.0017 0 0

 20 0.079 0.025 0.14 0.0364

 5.6 96 2.5 0 0

*** Record 34,36,37 Horizon 4

 4 20 1.68 0.079 0 0 0

 0.0017 0 0

 20 0.079 0.025 0.09 0.0234

 5.6 96 2.5 0 0

*** Record 34,36,37 Horizon 5

 5 20 1.59 0.068 0 0 0

 0.0017 0 0

 20 0.068 0.016 0.09 0.0234

 5.6 97 1.7 0 0

*** Record 34,36,37 Horizon 6

 6 20 1.59 0.068 0 0 0

 0.0017 0 0

 20 0.068 0.016 0.08 0.0208

 5.6 97 1.7 0 0

*** Record 34,36,37 Horizon 7

 7 800 1.59 0.068 0 0 0

 0.0017 0 0

 50 0.068 0.016 0.07 0.0182

 5.6 97 1.7 0 0

*** Record 34,36,37 Horizon 8

 8 100 1.59 0.396 0 0 0

 0.0017 0 0

 50 0.396 0.001 0.07 0.0182

 5.6 97 1.7 0 0

*** Record 40

 0

*** Record 42

 YEAR 10 YEAR 10 YEAR 10 0
31

*** Record 45

 3 YEAR

*** Record 46

 DCON1 TAVE 33 34 1.0E3

 INFL TCUM 33 33 0.0109

 IRRG TSER

 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:fenamidone

time is 4/ 2/2013 15:13:37

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

 Application Number of Total Use Koc Soil Aerobic

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

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

 0.801 1.0 0.801 2.60E+01 1000.0

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

groundwater screening cond (ppb) = 1.78E+02 

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