1

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

WASHINGTON, D.C. 20460

OFFICE OF 

PREVENTION, PESTICIDES

AND TOXIC SUBSTANCES 

PC Code No.: 129034

DP Barcodes: D359097, 362612

Date: July 24, 2009

SUBJECT: Drinking Water Assessment for: (1) IR-4 Registration for Flumioxazin to be used 

on Cucurbit Group 9, Leaf Petioles Subgroup 4B and Hops, and (2) Registration 

for Flumioxazin to be Used in the Noncrop Areas

TO: Joanne Miller, RM 23 

Barbara Madden, RM 05

John Redden

Registration Division (7505P)

FROM: Larry Liu, Environmental Scientist, Ph.D.

Environmental Fate and Effects Division (7507P)

THROUGH: Mah Shamim, Ph.D., Branch Chief

Environmental Risk Branch V

Environmental Fate and Effects Division (7507P)

The previous drinking water assessment for use of flumioxazin on cotton, almonds, grapes, 

Christmas trees, deciduous trees and container and field grown ornamentals (completed on July

7, 2003) can be used for the currently proposed uses of Chateau WDG and Broadstar Herbicides. 

The new uses include: (1) IR-4 Registration for Flumioxazin to be used on Cucurbit Group 9, 

Leaf Petioles Subgroup 4B and Hops, and (2) Registration for Flumioxazin in the Noncrop 

Areas. The maximum single application rates and the yearly/seasonal application rates for the 

proposed uses are either lower than or equivalent to the rates used in the drinking water 

assessment completed on July 17, 2003. The minimum application intervals for the proposed 

new uses are the same or longer than the interval used in the drinking water assessment 

completed on July 17, 2003. Table 1 includes the application rates and numbers for flumioxazin 

on Cucurbit Group 9, Leaf Petioles Subgroup 4B and Hops. Table 2 includes the application 

rates and numbers for flumioxazin in the Noncrop Areas. 
2

\

Table 1. Uses and Application Rates for Flumioxazin on Cucurbit Group 9, Leaf Petioles 

Subgroup 4B, and Hops in the IR4 Registration (Chateau WDG Herbicide).

Crop Maximum 

single 

application 

rate (lb 

ai/A)

Maximum 

application 

number 

per season

Application 

interval

(days)

Maximum 

application 

rate per 

season 

(lb 

ai/A/season)

Application 

methods

Cucurbit Group 9

(such as 

cucumber)

0.10 1 - 0.10 Broadcast, 

band, aerial, 

chemigation

Leaf Petioles 

Subgroup 4B 

(such as celery) 

0.13 2 35 0.26 Broadcast, 

band, aerial, 

chemigation

Hops 0.19 1 - 0.19 Broadcast, 

band, aerial, 

chemigation

Table 2. Uses and Application rates in the Noncrop Areas for Flumioxazin Registration 

(Broadstar Herbicide).

Uses Single 

application 

rate (lb 

ai/A)

Maximum 

application 

number per 

season

Application 

interval

(days)

Maximum 

application 

rate per 

season 

(lb 

ai/A/season)

Application 

methods

Noncrop areas in 

apartment 

complexes, gravel 

surfaces, ground 

mats, golf courses, 

office complexes, 

parks, parking 

areas, recreational 

sites, schools, 

sidewalks and 

other similar sites*

0.375 2 56 0.750 Drop or 

rotary type 

granular 

equipment

* Label also includes uses on “container, field or landscape grown ornamental shrubs, trees, 

Christmas trees, ground covers, non-bearing fruit and nut trees, vines, and bare ground non-crop 

areas”

The previous drinking water assessment on cotton, almonds, grapes, Christmas trees, deciduous 

trees and container and field grown ornamentals is attached.
3

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

WASHINGTON, D.C. 20460

PC Code: 129034

MEMORANDUM:

Date: July 7, 2003

SUBJECT: Tier I Estimated Environmental Concentrations for Flumioxazin and Its 

Degradates from the Use on cotton, almonds, grapes, Christmas trees, deciduous 

trees and container and field grown ornamentals

TO: Joanne Miller, PM 23 

J. Stone, PM Team Reviewer

Registration Division

Doug Dotson

Health Effects Division 

FROM: Larry Liu, Ph.D., Environmental Scientist

Environmental Risk Branch V

Environmental Fate and Effects Division (7507C)

THROUGH: Mah Shamim, Ph.D., Branch Chief

Environmental Risk Branch V

Environmental Fate and Effects Division (7507C)

This document summarizes the Tier I Estimated Environmental Concentrations (EECs) for 

flumioxazin under the use for cotton, almonds, grapes, Christmas trees, deciduous trees and 

container and field grown ornamentals. The FIRST and SCI-GROW models were used to 

estimate the concentrations of this chemical and its degradates in surface water and groundwater, 

respectively. These values represent upper-bound estimates of the concentrations that might be 

found in surface water and groundwater due to the use of flumioxazin on cotton, almonds, 

grapes, Christmas trees, deciduous trees and container and field grown ornamentals. It should be 

noted that: (1) flumioxazin water numbers were generated from the models in which the Koc 

values used were obtained from a column leaching study instead of the typical absorption study; 

(2) 482-HA water numbers were generated from the models in which the Koc values for THPA 

were used; (3) APF and THPA water numbers were generated from the adsorption/desorption 
4

studies; and (4) the initial residue levels for the parent and its degradates used in the models were 

based on the 30-day results of the hydrolysis study . Due to the rapid hydrolysis rate of the parent 

compound, EFED acknowledged the difficulty in obtaining adsorption coefficients from the 

batch equilibrium study. Due to the rapid dissipating of flumioxazin in the environment, EFED 

is not concerned about the parent compound. Results at pH 7 are presented below: 

Peak Conc. in Surface Water Conc. in Groundwater

Flumioxazin 1.03 ppb negligible

482-HA 6.87 ppb 45.27 ppb

APF 26.46 ppb 2.66 ppb

THPA 27.67 ppb 182.28 ppb

Should the results of this assessment need further refinement, please contact us as soon as 

possible so that we may schedule a Tier II assessment.

Water Resource Assessment

Flumioxazin is unlikely to contaminate surface water and groundwater. However, its hydrolysis 

degradates (482-HA, APF, and THPA) are more persistent and mobile and they tend to reach 

surface water and groundwater at much higher concentrations. Fate studies show that 

flumioxazin is relative mobile (average Koc = 557, note: Koc values were estimated from a 

column leaching study), but non-persistent (hydrolysis half-life at pH 7 = 1 day; aqueous 

photolysis half-life at pH 5 = 1 day; soil aerobic metabolism half life = 14.7 days; aquatic 

anaerobic metabolism half-life = 0.2 days). Since hydrolysis appears to be the major route of 

dissipation in the environment, EFED used the residue levels detected at the end of hydrolysis as 

the input parameters for modeling. Table 1 listed the degradates identified and their relative 

concentrations from the hydrolysis study. Based on the relative concentrations presented in 

Table 1 and the application rate of the parent, the worst residue levels that could be found on the 

soil surface were estimated (see Table 2).

Table 1. Percentages of the applied radioactivity identified at the end of 30-day hydrolysis study

Compound pH 5 pH 7 pH 9

% of the applied

Flumioxazin negligible 4.7 negligible

482-HA negligible 9.3 97.3
5

APF 83.6 80.0 negligible

THPA 95.4 83.6 negligible

Table 2. Maximum amounts of flumioxazin and its degradates expected to be on the soil surface 

after flumioxazin was applied at the maximum rate of 0.383 lb ai/A/application (two applications 

per year with an application interval of 30-60 days). 

Compound pH 5 pH 7 pH 9

lbs ai/A/application

Flumioxazin negligible 0.019 negligible

482-HA negligible 0.038 0.391

APF 0.199 0.192 negligible

THPA 0.176 0.153 negligible

The FIRST and SCI-GROW models were used to estimate the concentrations of this chemical 

and its degradates in surface water and groundwater, respectively. These values represent upperbound estimates of the concentrations that might be found in surface water and groundwater due 

to the use of flumioxazin at the maximum application rate. Tables 3 and 4 listed the residue 

concentrations in the surface water and groundwater, respectively.

Table 3. Surface water estimated environmental peak concentrations for flumioxazin and its 

major degradates in various pH.

pH 5 pH 7 pH 9

Flumioxazin negligible 1.03 ppb negligible

482-HA negligible 6.87 ppb 70.71 ppb

APF 27.43 ppb 26.46 ppb negligible

THPA 31.83 ppb 27.67 ppb negligible

Table 4. Groundwater estimated environmental concentrations for flumioxazin and its major 

degradates in various pH.

pH 5 pH 7 pH 9
6

pH 5 pH 7 pH 9

Flumioxazin negligible negligible negligible

482-HA negligible 45.27 ppb 465.82 ppb

APF 2.76 ppb 2.66 ppb negligible

THPA 209.68 ppb 182.28 ppb negligible

Surface Water and Groundwater Input Parameters

Surface water concentrations of flumioxazin were estimated with FIRST. The estimates made 

with FIRST are intended here to represent drinking water sources with significant turnover such 

that there is no year-to-year accumulation. Ground water concentrations were predicted with 

SCI-GROW. Input parameters for FIRST and SCI-GROW at pH 7 (Tables 5-8) were selected 

according to current EFED guidance. The application rates for flumioxazin for pH 5 and 9 can 

be found in Table 2. It should be noted that the worst cases were assumed for those input 

parameters which no information were available (such as APF was assumed to be very stable 

under aerobic soil metabolism conditions with a half-life of 999 days). Since the intended use of 

FIRST in this particular simulation is only to represent a water body with significant water 

turnover, only the peak concentration has physical significance. The averaged concentrations 

reported in Appendix 1 do not account for the turnover and thus are less physically meaningful. 

The SCI-GROW output file is located in Appendix 2. 

Table 5. FIRST and SCI-GROW input parameters for flumioxazin at pH 7.

Parameter FIRST Values SCI-GROW Values

Application number per year 2 2 

Application rate 0.019 lb ai/acre 0.019 lb ai/acre

Application type aerial

pH 7 Hydrolysis half life 1 day 1 day

Photolysis half life 1 day n/a

Aerobic soil metabolism half life 23.4 14.7 days (mean value)

Aerobic aquatic half life n/a n/a

Solubility 1.8 ppm n/a

Koc*656 112

* Koc was estimated from a column leaching study instead of the adsorption study. Due 

to the rapid hydrolysis rate of the parent compound, EFED acknowledged the difficulty in 

obtaining adsorption coefficients from the batch equilibrium study. 
7

Table 6. FIRST and SCI-GROW input parameters for 482-HA at pH 7.

Parameter FIRST Values SCI-GROW Values

Application number per year 2 2 

Application rate 0.038 lb ai/acre 0.038 lb ai/acre

Application type aerial

pH 7 Hydrolysis half life stable stable

Photolysis half life stable n/a

Aerobic soil metabolism half life stable stable

Aerobic aquatic half life stable n/a

Solubility*10,000 ppm n/a

Koc** 13 13

* No water solubility is available so 10,000 ppm was assumed.

** Koc for THPA was used for 482-HA

Table 7. FIRST and SCI-GROW input parameters for APF at pH 7.

Parameter FIRST Values SCI-GROW Values

Application number per year 2 2 

Application rate 0.192 lb ai/acre 0.192 lb ai/acre

Application type aerial

pH 7 Hydrolysis half life stable stable

Photolysis half life stable n/a

Aerobic soil metabolism half life stable stable

Aerobic aquatic half life stable n/a

Solubility*10,000 ppm n/a

Koc 201 201

* No water solubility is available so 10,000 ppm was assumed.

Table 8. FIRST and SCI-GROW input parameters for THPA at pH 7.

Parameter FIRST Values SCI-GROW Values

Application number per year 2 2 
8

Parameter FIRST Values SCI-GROW Values

Application rate 0.153 lb ai/acre 0.153 lb ai/acre

Application type aerial

pH 7 Hydrolysis half life stable stable

Photolysis half life stable n/a

Aerobic soil metabolism half life stable stable

Aerobic aquatic half life stable n/a

Solubility*10,000 ppm n/a

Koc 13 13

* No water solubility is available so 10,000 ppm was assumed.

Drinking Water Recommendations

EFED has recommended that the Health Effects Division use the concentrations presented in 

Table 9 for drinking water EECs. 

Table 9. Estimated EECs for flumioxazin and its degradates in surface water and groundwater at 

pH 7.

Compound Average 56-Day

Conc. in Surface 

Water

Peak Conc. in 

Surface Water

Conc. in 

Groundwater

Flumioxazin negligible 1.03 ppb negligible

482-HA 4.84 ppb 6.87 ppb 45.27 ppb

APF 12.85 ppb 26.46 ppb 2.66 ppb

THPA 19.50 ppb 27.67 ppb 182.28 ppb
9

Appendix 1: FIRST for Environmental Fate Assessment

Background Information on FIRST:

FIRST is a new screening model designed to estimate the pesticide concentrations 

found in water for use in drinking water assessments. It provides high-end values on the 

concentrations that might be found in a small drinking water reservoir due to the use of 

pesticide. Like GENEEC, the model previously used for Tier I screening level, FIRST is a 

single-event model (one run-off event), but can account for spray drift from multiple 

applications. FIRST uses a Drinking Water Reservoir instead of a pond as the standard 

scenario. The FIRST scenario includes a 427 acres field immediately adjacent to a 13 acres 

reservoir, 9 feet deep, with continuous flow (two turnovers per year). The pond receives a 

spray drift event from each application plus one runoff event. The runoff event moves a 

maximum of 8% of the applied pesticide into the pond. This amount can be reduced due to 

degradation on field and the effect of binding to soil. Spray drift is equal to 6.4% of the 

applied concentration from the ground spray application and 16% for aerial applications.

FIRST also makes adjustments for the percent crop area. While FIRST assumes 

that the entire watershed would not be treated, the use of a PCA is still a screen because it 

represents the highest percentage of crop cover of any large watershed in the US, and it 

assumes that the entire crop is being treated. Various other conservative assumptions of 

FIRST include the use of a small drinking water reservoir surrounded by a runoff-prone 

watershed, the use of the maximum use rate, no buffer zone, and a single large rainfall.

FIRST Results at various pHs:

PH 5

 RUN No. 11 FOR APF ON Christmas tree * INPUT VALUES * 

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

 RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP

 ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

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

 .199( .398) 2 30 201.0 10000.0 AERIAL(16.0) 87.0 .0

 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) 

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

 METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED

 (FIELD) RAIN/RUNOFF (RESERVOIR) (RES.-EFF) (RESER.) (RESER.) 

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

 .00 2 N/A .00- .00 .00 .00

 UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.0 AUG 1, 2001

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

 PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) 

 CONCENTRATION CONCENTRATION 

 -----------------------------------------------------------------------------------------
10

 27.426 13.322

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

pH 5

 RUN No. 2 FOR THPA ON Christmas tree * INPUT VALUES * 

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

 RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP

 ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

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

 .176( .352) 2 30 13.0 10000.0 AERIAL(16.0) 87.0 .0

 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) 

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

 METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED

 (FIELD) RAIN/RUNOFF (RESERVOIR) (RES.-EFF) (RESER.) (RESER.) 

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

 .00 2 N/A .00- .00 .00 .00

 UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.0 AUG 1, 2001

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

 PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) 

 CONCENTRATION CONCENTRATION 

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

 

 31.830 22.436

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

pH 7

 RUN No. 3 FOR Flumioxazin ON Christmas tree * INPUT VALUES * 

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

 RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP

 ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

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

 .019( .027) 2 30 656.0 1.8 AERIAL(16.0) 87.0 .0

 

 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) 

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

 METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED

 (FIELD) RAIN/RUNOFF (RESERVOIR) (RES.-EFF) (RESER.) (RESER.) 

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

 23.40 2 1.00 1.00- 124.00 .00 .99

 UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.0 AUG 1, 2001

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

 PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) 

 CONCENTRATION CONCENTRATION 

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

 1.034 .004

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

pH 7
11

 RUN No. 4 FOR 482-HA ON Christmas tree * INPUT VALUES * 

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

 RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP

 ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

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

 .038( .076) 2 30 13.0 10000.0 AERIAL(16.0) 87.0 .0

 

 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) 

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

 METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED

 (FIELD) RAIN/RUNOFF (RESERVOIR) (RES.-EFF) (RESER.) (RESER.) 

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

 .00 2 N/A .00- .00 .00 .00

 UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.0 AUG 1, 2001

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

 PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) 

 CONCENTRATION CONCENTRATION 

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

 6.872 4.844

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

pH 7

 RUN No. 4 FOR APF ON Christmas tree * INPUT VALUES * 

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

 RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP

 ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

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

 .192( .384) 2 30 201.0 10000.0 AERIAL(16.0) 87.0 .0

 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) 

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

 METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED

 (FIELD) RAIN/RUNOFF (RESERVOIR) (RES.-EFF) (RESER.) (RESER.) 

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

 .00 2 N/A .00- .00 .00 .00

 UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.0 AUG 1, 2001

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

 PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) 

 CONCENTRATION CONCENTRATION 

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

 26.461 12.854

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

pH 7

 RUN No. 6 FOR THPA ON Christmas tree * INPUT VALUES * 

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

 RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP

 ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

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

 .153( .306) 2 30 13.0 10000.0 AERIAL(16.0) 87.0 .0
12

 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) 

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

 METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED

 (FIELD) RAIN/RUNOFF (RESERVOIR) (RES.-EFF) (RESER.) (RESER.) 

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

 .00 2 N/A .00 - .00 .00 .00

 UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.0 AUG 1, 2001

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

 PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) 

 CONCENTRATION CONCENTRATION 

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

 27.670 19.504

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

pH 9

 RUN No. 7 FOR 482-HA ON Christmas tree * INPUT VALUES * 

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

 RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP

 ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

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

 .391( .782) 2 30 13.0 10000.0 AERIAL(16.0) 87.0 .0

 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) 

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

 METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED

 (FIELD) RAIN/RUNOFF (RESERVOIR) (RES.-EFF) (RESER.) (RESER.) 

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

 .00 2 N/A .00- .00 .00 .00

 UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.0 AUG 1, 2001

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

 PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) 

 CONCENTRATION CONCENTRATION 

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

 70.713 49.843

 --------------------------------------------------------------------------------------------------
13

Appendix 2: SCI-ROW for Environmental Fate Assessment

Background Information on SCI-GROW:

SCI-GROW provides a ground water screening exposure value to be used in determining 

the potential risk to human health from drinking water contaminated with the pesticide. 

Since the SCI-GROW concentrations are likely to be approached in only a very small 

percentage of drinking water sources, i.e., highly vulnerable aquifers, it is not appropriate 

to use SCI-GROW concentrations for national or regional exposure estimates.

SCI-GROW estimates likely ground water concentrations if the pesticide is used at the 

maximum allowable rate in areas where ground water is exceptionally vulnerable to 

contamination. In most cases, a large majority of the use area will have ground water that 

is less vulnerable to contamination that the areas used to derive the SCI-GROW estimate. 

SCI-GROW Results at pH 5

VERSION 2.2: NOVEMBER 1, 2001 

 RUN No. 11 FOR APF ** INPUT VALUES ** 

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

 APP RATE APPS/ TOTAL/ SOIL AEROBIC SOIL METAB 

 (LBS/AC) YEAR SEASON KOC HALFLIFE (DAYS) 

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

 .199 2 .398 201.0 999.00

 GROUND-WATER SCREENING CONCENTRATION (IN UG/L - PPB) 

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

 2.756142

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

 RUN No. 12 FOR THPA ** INPUT VALUES ** 

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

 APP RATE APPS/ TOTAL/ SOIL AEROBIC SOIL METAB 

 (LBS/AC) YEAR SEASON KOC HALFLIFE (DAYS) 

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

 .176 2 .352 13.0 999.00

 GROUND-WATER SCREENING CONCENTRATION (IN UG/L - PPB) 

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

 209.676900

 -------------------------------------------------------- 
14

SCIGROW Results at pH 7 : 

 RUN No. 1 FOR flumioxazin ** INPUT VALUES ** 

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

 APP RATE APPS/ TOTAL/ SOIL AEROBIC SOIL METAB 

 (LBS/AC) YEAR SEASON KOC HALFLIFE (DAYS) 

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

 .019 2 .038 112.0 14.70

 GROUND-WATER SCREENING CONCENTRATION (IN UG/L - PPB) 

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

 .00317

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

 RUN No. 2 FOR 482-HA ** INPUT VALUES ** 

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

 APP RATE APPS/ TOTAL/ SOIL AEROBIC SOIL METAB 

 (LBS/AC) YEAR SEASON KOC HALFLIFE (DAYS) 

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

 .038 2 .076 13.0 999.00

 GROUND-WATER SCREENING CONCENTRATION (IN UG/L - PPB) 

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

 45.271150

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

 RUN No. 3 FOR APF ** INPUT VALUES ** 

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

 APP RATE APPS/ TOTAL/ SOIL AEROBIC SOIL METAB 

 (LBS/AC) YEAR SEASON KOC HALFLIFE (DAYS) 

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

 .192 2 .384 201.0 999.00

 GROUND-WATER SCREENING CONCENTRATION (IN UG/L - PPB) 

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

 2.659193

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

 RUN No. 4 FOR THPA ** INPUT VALUES ** 

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

 APP RATE APPS/ TOTAL/ SOIL AEROBIC SOIL METAB 

 (LBS/AC) YEAR SEASON KOC HALFLIFE (DAYS) 

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

 .153 2 .306 13.0 999.00

 GROUND-WATER SCREENING CONCENTRATION (IN UG/L - PPB) 

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

 182.275900

 -------------------------------------------------------- 
15

SCI-GROW Results at pH 9

 

RUN No. 21 FOR 482-HA ** INPUT VALUES ** 

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

 APP RATE APPS/ TOTAL/ SOIL AEROBIC SOIL METAB 

 (LBS/AC) YEAR SEASON KOC HALFLIFE (DAYS) 

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

 .391 2 .782 13.0 999.00

 GROUND-WATER SCREENING CONCENTRATION (IN UG/L - PPB) 

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

 465.816300

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