1

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

WASHINGTON, D. C. 20460

OFFICE OF

PREVENTION, PESTICIDES

AND TOXIC SUBSTANCES

 January 4, 2005

PC Code 124871

DP Barcode: D311291

MEMORANDUM

SUBJECT: Estimated Drinking Water Concentrations of combined residue of spirodiclofen 

and it’s degradates (spirodiclofen-enol, spirodiclofen-ketohydroxy and 

spirodiclofen-dihydroxy) in surface water and groundwater

To: Daniel Kenny, Risk Manager 

Rita Kumer, Chemical Review Manager

Reregistration Division (7505C)

Mary Clock-Rust, Biologist

Tom Bloem, Chemist

Health Effects Division (7509C)

From: Faruque Khan, Ph.D, Environmental Scientist

Larry Liu, Ph.D, Environmental Scientist

Environmental Risk Branch V

Environmental Fate and Effects Division (7507C)

Through: Mah Shamim, Ph.D., Chief

Environmental Risk Branch V

Environmental Fate and Effects Division (7507C)

This memorandum presents a drinking water assessment to support spirodiclofen (Envidor ® 2 

SC) miticide use on citrus, pome fruits, stone fruits, tree nuts crops, and grapes. The models, 

Pesticide Root Zone Model, Exposure Analysis Modeling System (PRZM/EXAMS) and 

Screening Concentrations In Ground Water Model (SCIGROW) were used in estimating the total 

residue concentrations of spirodiclofen in surface water and groundwater respectively. The 

Estimated Drinking Water Concentrations (EDWCs) of spirodiclofen and its three metabolites 

(spirodiclofen-enol, spirodiclofen-ketohydroxy and spirodiclofen-dihydroxy) were computed 

using application rates of 0.53 to 0.28 lbs. a.i./Acre on multiple crops. Tier II surface water 

modeling of Florida citrus scenario using the index reservoir with the default percent cropped 

area (PCA=0.87) predicts the 1 in 10 year peak (acute) concentration of spirodiclofen residues is 

not likely to exceed 23.86 μg/L. The 1 in 10 year annual average concentration (non-cancer 
 2  27

chronic) and 30 year annual average concentration (cancer) of spirodiclofen residues is not likely 

to exceed 4.99 and 1.67 μg/L, respectively. Tier I SCIGROW model was used in generating 

groundwater EDWCs for the highest application rate of 0.53 lbs. a.i./A and the resulted 

concentration is 0.43 μg/L for spirodiclofen residue, which is recommended to use for both acute 

and chronic exposures. The EDWCs for surface and ground water resources are presented in 

Table 1. An electronic PRZM/EXAMS time-series output file of PCA adjusted daily EDWCs for 

surface water for Florida citrus scenario was also provided to Tom Bloem, Health Effects 

Division (HED).

Table 1. Estimated Drinking Water Concentrations (EDWC’s) of total residue of 

Spirodiclofen and it’s three degradates (Spirodiclofen-enol, Spirodiclofen-Ketohydroxy 

and Spirodiclofen-dihydroxy) in surface water and groundwater

Chemical

 Surface Water (μg/L) Groundwater

Peak (μg/L)

Acute 

Non-cancer 

chronic 

Cancer chronic

Total residues

(Spirodiclofen, 

Spirodiclofenenol, 

SpirodiclofenKetohydroxy

and 

23.86 4.99 1.67 0.44*

* Recommended EDWCs values for acute and chronic for groundwater

1.0 ESTIMATION OF SURFACE WATER AND GROUNDWATER EXPOSURE 

CONCENTRATIONS

A cumulative residue modeling approach was used to account for the environmental fate and 

transport of spirodiclofen and its degradation products (spirodiclofen-enol, spirodiclofenketohydroxy and spirodiclofen-dihydroxy) with toxicological concern. These residues were 

designated by the HED’s Metabolite Assessment Review Committee (MARC) as being 

spirodiclofen residues of human-health toxicological concern. Linear fitting techniques using the 

first order degradation model (y = -bx + a) was used in calculating the combined residue halflives. The Envidor ® 2 SC label application rates and the environmental fate parameters for 

spirodiclofen residue were used in estimating EDWCs using two screening models 

PRZM/EXAMS, shell PE4V01a (8/13/03) for surface water and SCIGROW v.2.3 (7/29/03) for 

groundwater. The outputs of the two screening models represent estimates of the concentrations 

that might be found in surface water and groundwater due to the use of spirodiclofen. Several

scenarios (apple, citrus, peaches, grape, and pecan) were investigated and the Florida citrus 

provided the highest EDWCs among the modeled scenarios (Table 2).
 3  27

Table 2. Estimated Drinking Water Concentrations (EDWCs) of total residue concern of Spirodiclofen and 

it’s three degradates (spirodiclofen-enol, spirodiclofen-ketohydroxy and spirodiclofen-dihydroxy) 

for multiple crop scenarios 

Crops 

Scenarios

(Application rate, 

frequency)

1/10 Peak 

(Acute)

μg/L ‡ 

1/10 Yearly 

Average

(non-Cancer 

Chronic)

μg/L ‡ 

30 years Average

(Cancer Chronic)

μg/L ‡ 

Florida Citrus 0.31lbs ai/A , 1 

application 

23.86 4.99 1.67

GA Pecan 0.53lbs ai/A , 1 

application 

11.75 2.02 0.70

PA Apple 0.28lbs ai/A , 1 

application 

5.52 1.97 1.09

GA Peaches 0.28lbs ai/A , 1 

application

3.92 1.41 0.64

CA Grape 0.53lbs ai/A , 1 

application 

2.50 1.44 0.97

OR Apple 0.28lbs ai/A , 1 

application

1.01 0.59 0.43

‡ = PRZMEXAM EDWC values for crops were corrected for PCA (default =0.87)

2.0 Background Information on PRZM/EXAMS 

The linked PRZM and EXAMS model (PRZM/EXAMS) is typically used by the Environmental 

Fate and Effects Division (EFED) in estimating pesticides concentrations in surface waters. 

PRZM is employed to evaluate runoff loading to a receiving surface water body. As soon as the 

pesticide residues reaches the surface water, EXAMS uses algorithms to the pesticides 

concentrations by taken into account different dissipation mechanism in the aqueous and 

sediment phases.

PRZM is a one-dimensional finite-difference modeling system that was originally developed to 

model nitrogen soil kinetic processes and groundwater environment. It was later enhanced to 

expand its capability to predict pesticides transport and transformation down through the crop 

zone and saturated zone. The expanded capabilities cover additional phenomena such as soil 

temperature simulation, microbial transformation, vapor phase transport in soils, volatilization, 

irrigation simulation, and a method of characteristics (MOC) algorithm to eliminate numerical 

dispersion.

EXAMS is a model that has a set of process modules that link fundamental chemical properties 

to limnological processes that control the kinetics and transport of chemicals in aquatic systems. 

It provides facilities for steady state or long-term evaluation of chronic chemical discharges, 

initial-value approaches for studying short-term contaminant releases, and full kinetic 
 4  27

simulations that allow for monthly variation in mean climatological factors, and changes in 

contaminant loadings on daily time scales. It is fairly and relatively complex model that requires 

more input variables, ranging from hydro-geological and weather data to pesticide 

physicochemical properties, mobility coefficients, and degradation rate constants in the aqueous 

and sediment phases.

3.0 Background Information on SCI-GROW

SCIGROW is a regression-based model that provides a groundwater screening exposure value to 

be used in determining the potential risk to human health from drinking water contaminated with 

the pesticide. SCIGROW estimates likely groundwater concentrations if the pesticide is used at 

the maximum allowable rate in areas where groundwater is exceptionally vulnerable to 

contamination. 

4.0 Uncertainties, Assumptions, and Limitations

Uncertainties, assumptions, and limitations of the simulation modeling are as follows:

· A major uncertainty in the assessment is the lack of environmental fate data for the toxic 

transformation products of spirodiclofen. In order to address this uncertainty, EFED has 

conducted the Tier II modeling on the summed spirodiclofen residues instead of 

individual residues. This approach was taken because the environmental fate studies were 

deficient in addressing the identification and fate of spirodiclofen transformation 

products.

· The cumulative residue modeling method assumes environmental fate properties for 

spirodiclofen and its degradation products (spirodiclofen-enol, spirodiclofen-ketohydroxy 

and spirodiclofen-dihydroxy) are similar. This modeling approach provides a 

conservative assessment process for consideration of simultaneous formation and decline 

of spirodiclofen residues. However, it is likely to provide conservative estimates 

because minor degradation products (<10% of applied) may dictate the environmental 

fate properties for all spirodiclofen residues

· The adsorption coefficient and solubility of spirodiclofen-enol was used because it has 

the lowest average Koc and highest solubility. These properties may provide conservative 

estimates because low Koc and high solubility may dictate the runoff load for all 

spirodiclofen residues.

· PRZM-EXAMS scenarios are regionally representative for each crop. They may not 

represent the most conservative runoff or spray drift situation for each and every crop. It 

is assumed focusing on several scenarios in higher runoff areas such as the eastern United 

States will capture upper end spirodiclofen residue concentrations in drinking water.

· Spirodiclofen is a new chemical. Monitoring data are not available to evaluate the 

prediction potential of PRZM/EXAMS and SCIGROW simulation modeling. 
 5  27

5.0 Modeling Inputs and Results:

Tables 3 and 4 summarize the spirodiclofen input values used in the model runs for PRZM/ 

EXAMS and SCIGROW, respectively. PRZM /EXAMS and SCIGROW modeling results are 

presented in Table 1 and 2. This memo also contains the copies of the outputs generated from the 

PRZM/EXAMS and SCIGROW models (Appendix A). Appendix A-2 has a truncated 

PRZM/EXAMS daily time-series output file. Half-life calculation methods for spirodiclofen total 

residue analysis can be found in Appendix B for various environmental fate studies. 

Table 3. PRZM/EXAMS Input Parameters for spirodiclofen and its degradates (spirodiclofen-enol, 

spirodiclofen-ketohydroxy and spirodiclofen-dihydroxy)

Parameters Values & Units Sources Comments

Molecular Weight 414.4 g Mole-1 MRID 45697217 ----

Vapor Pressure 25oC 5.25E-07Torr MRID 45697217 

(parent)

----

Water Solubility @ 

pH 7.0 and 20oC

6000 mg/L MRID 45697227 (-

enol)

The solubility of Spirodiclofenenol at neutral pH represents 

the maximum solubility 

among the residue concerns

Hydrolysis Half-Life 

(pH 7)

Stable MRID 45697217 Sum of spirodiclofen and -enol 

= 100% of applied at 30 days at 

pH 7

Aerobic Soil 

Metabolism t1⁄2,

75.8 days (90% upper conf. 

bound on 5 values) 

(Sandy loam 119.5 days

Sandy loam 25.7 days

Sand 46.8 days

Loamy Sand 25.7 days

Silt 17.6 days)

MRIDs 45697-204,

-208, & -228 

(parent)

Half-life of these soils were 

based on sum of spirodiclofen, 

-enol, -dihydroxy, and -

ketohydroxy. 

Aerobic aquatic 

metabolism 

151.6 day (75.8*2) MRID 45697205 

(parent)

Stable in two different systems 

based on sum of spirodiclofen 

and -enol. Spirodiclofen-enol 

was detected in the water, 

sediment and total system, but 

was variable and showed no 

clear pattern of decline. 2X of 

Soil aerobic half-life was used 

according to EFED’s input 

Guidelines‡. 
 6  27

Table 3. PRZM/EXAMS Input Parameters for spirodiclofen and its degradates (spirodiclofen-enol, 

spirodiclofen-ketohydroxy and spirodiclofen-dihydroxy)

Direct Aqueous 

Photolysis

25.4 days MRID 45697218 Based on sum of spirodiclofen 

and -enol. Adjusted for 12-

hour light/dark cycle; stable in 

dark control.

Soil Water Partition 

Coefficient (Koc)

17.79 L Kg-1

(mean of 4 values )

MRID 456972213 (-

enol) 

Mean Koc of Spirodiclofenenol was used ,which 

represents least adsorption 

among parent and degradates.

 Application Method Ground Spray (Air blast)

CAM§= 2

Envidor ®2 SC 

Miticide Label ( EPA 

Reg. No. 3125-LOR

----

 Spray Efficiency 99% According to 

EFED’s input 

Guidelines‡

Standard assumption

 Spray Drift 

(air blast)

0.063 According to 

EFED’s input 

Guidelines‡

Standard assumption

CROP MANAGEMENT

Crop 

(Scenarios)

Pesticide 

application rate 

Application Date Sources Comments

Citrus (FL Citrus) 

0.31lbs ai/A , 1 

application

May 15 Envidor ®

2 SC 

Miticide Label ( EPA 

Reg. No. 3125-LOR

No application date available. 

Spring date used

Pome Fruits (OR 

apple and PA apple)

0.28 lbs ai/A , 1 

application

May 15 Envidor ®

2 SC 

Miticide Label ( EPA 

Reg. No. 3125-LOR

Stone Fruits (GA 

Peaches) 

0.28 lbs ai/A , 1 

application

May 15 Envidor ®

2 SC 

Miticide Label ( EPA 

Reg. No. 3125-LOR

Grapes (CA Grapes) 

0.53 lbs ai/A , 1 

application

May 15 Envidor ®

2 SC 

Miticide Label ( EPA 

Reg. No. 3125-LOR
 7  27

Table 3. PRZM/EXAMS Input Parameters for spirodiclofen and its degradates (spirodiclofen-enol, 

spirodiclofen-ketohydroxy and spirodiclofen-dihydroxy)

Tree Nut Crops (GA 

Pecan) 

0.53lbs ai/A , 1 

application

May 15 Envidor ®

2 SC 

Miticide Label ( EPA 

Reg. No. 3125-LOR

‡ Guidance for selecting input parameters in modeling for environmental fate and transport of pesticides. Version II. February 28, 

2002.

§

Chemical Application Method, PRZM 3.1 User manual (1997), National Exposure Research Laboratory, USEPA, Athens, GA. 

Table 4. SCIGROW Input Parameters for Spirodiclofen and its degradates (spirodiclofen-enol, 

spirodiclofen-ketohydroxy and spirodiclofen-dihydroxy)

Parameter Values & Units Sources Comments

Application Rate and 

frequency

0.53 lbs ai/A , 1 application Envidor ®

2 SC 

Miticide Label ( EPA 

Reg. No. 3125-LOR

Maximum application rate

Organic Carbon 

Partition Coefficient 

(median KOC)

15.68 L Kg-1

(median of 4 values‡ )

MRID 456972213 

(-enol)

Median Koc of Spirodiclofenenol was used ,which 

represents the least adsorption 

among parent and degradates.

Aerobic Soil 

Metabolism Half-Life

25.7 days (median value‡ )

(Sandy loam 119.5 days

Sandy loam 25.7 days

Sand 46.8 days

Loamy Sand 25.7 days

Silt 17.6 days)

MRIDs 45697-204,

-208, & -228 

(parent)

Half-life of these soils were 

based on sum of spirodiclofen, 

-enol, -dihydroxy, and -

ketohydroxy. 

‡

Guidance for selecting input parameters in modeling for environmental fate and transport of pesticides. Version II. February 28, 

2002.
 8  27

APPENDIX A-1. PRZM/EXAMS OUTPUT FILES

stored as FLcitrus.out

Chemical: Spirodiclofen

PRZM environment: FLcitrusC.txt

EXAMS environment: ir298.exv

Metfile: w12842.dvf

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 1.39 1.35 1.26 1.08 0.96 0.35

1962 1.47 1.43 1.29 1.05 0.93 0.36

1963 0.88 0.86 0.80 0.75 0.70 0.29

1964 3.15 3.10 2.87 2.41 2.08 0.79

1965 2.88 2.82 2.57 2.07 1.77 0.73

1966 8.62 8.42 7.61 6.11 5.22 1.89

1967 1.34 1.31 1.24 1.07 0.97 0.52

1968 4.42 4.31 3.89 3.11 2.66 0.98

1969 27.20 26.55 24.11 19.24 16.35 5.75

1970 14.36 14.02 12.97 10.38 8.82 3.46

1971 44.15 43.10 38.98 31.12 26.48 9.39

1972 2.86 2.81 2.58 2.16 1.90 1.06

1973 0.86 0.83 0.75 0.67 0.60 0.25

1974 2.09 2.04 1.86 1.49 1.27 0.49

1975 1.43 1.39 1.27 1.03 0.93 0.37

1976 49.18 48.13 43.63 34.97 29.79 10.35

1977 3.46 3.40 3.16 2.68 2.37 1.34

1978 5.19 5.06 4.76 3.85 3.27 1.19

1979 7.46 7.28 6.57 5.22 4.50 1.67

1980 1.72 1.68 1.53 1.37 1.20 0.54

1981 4.43 4.32 4.05 3.33 2.85 1.04

1982 4.15 4.08 3.86 3.11 2.65 1.01

1983 27.45 26.78 24.20 19.28 16.39 5.72

1984 6.54 6.38 5.75 4.58 3.90 1.84

1985 10.83 10.60 9.60 7.65 6.50 2.35

1986 1.18 1.15 1.06 1.00 0.90 0.53

1987 9.66 9.43 8.51 6.79 5.76 2.01

1988 2.64 2.57 2.33 2.03 1.76 0.77

1989 1.29 1.26 1.13 0.91 0.85 0.37

1990 1.48 1.44 1.35 1.11 0.97 0.37

Sorted results

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

0.03 49.18 48.13 43.63 34.97 29.79 10.35

0.06 44.15 43.10 38.98 31.12 26.48 9.39

0.10 27.45 26.78 24.20 19.28 16.39 5.75

0.13 27.20 26.55 24.11 19.24 16.35 5.72

0.16 14.36 14.02 12.97 10.38 8.82 3.46

0.19 10.83 10.60 9.60 7.65 6.50 2.35

0.23 9.66 9.43 8.51 6.79 5.76 2.01
 9  27

0.26 8.62 8.42 7.61 6.11 5.22 1.89

0.29 7.46 7.28 6.57 5.22 4.50 1.84

0.32 6.54 6.38 5.75 4.58 3.90 1.67

0.35 5.19 5.06 4.76 3.85 3.27 1.34

0.39 4.43 4.32 4.05 3.33 2.85 1.19

0.42 4.42 4.31 3.89 3.11 2.66 1.06

0.45 4.15 4.08 3.86 3.11 2.65 1.04

0.48 3.46 3.40 3.16 2.68 2.37 1.01

0.52 3.15 3.10 2.87 2.41 2.08 0.98

0.55 2.88 2.82 2.58 2.16 1.90 0.79

0.58 2.86 2.81 2.57 2.07 1.77 0.77

0.61 2.64 2.57 2.33 2.03 1.76 0.73

0.65 2.09 2.04 1.86 1.49 1.27 0.54

0.68 1.72 1.68 1.53 1.37 1.20 0.53

0.71 1.48 1.44 1.35 1.11 0.97 0.52

0.74 1.47 1.43 1.29 1.08 0.97 0.49

0.77 1.43 1.39 1.27 1.07 0.96 0.37

0.81 1.39 1.35 1.26 1.05 0.93 0.37

0.84 1.34 1.31 1.24 1.03 0.93 0.37

0.87 1.29 1.26 1.13 1.00 0.90 0.36

0.90 1.18 1.15 1.06 0.91 0.85 0.35

0.94 0.88 0.86 0.80 0.75 0.70 0.29

0.97 0.86 0.83 0.75 0.67 0.60 0.25

0.10 27.43 26.76 24.19 19.28 16.39 5.74

Average 

of yearly 

averages:

1.93

Inputs generated by pe4.pl - 8-August-2003

Data used for this run:

Output File: FLcitrus

Metfile: w12842.dvf

PRZM scenario:FLcitrusC.txt

EXAMS environment file: ir298.exv

Chemical Name: Spirodiclofen

Description Variable 

Name

Value Units Comments

Molecular 

weight

mwt 411.4 g/mol

Henry's Law 

Const.

henry atm-m^3/mol

Vapor 

Pressure

vapr 5.25E

-07

torr

Solubility sol 6000 mg/L

Kd Kd mg/L

Koc Koc 17.79 mg/L

Photolysis 

half-life

kdp 25.4 days Half-life

Aerobic kbacw 151.6 days Halfife
 10  27

Aquatic 

Metabolism

Anaerobic 

Aquatic 

Metabolism

kbacs days Halfife

Aerobic Soil 

Metabolism

asm 75.8 days Halfife

Hydrolysis: pH 7 0 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation 

Depth:

DEPI 0 cm

Application 

Rate:

TAPP 0.35 kg/ha

Application 

Efficiency:

APPEFF 0.99 fraction

Spray Drift DRFT 0.063 fraction of application rate applied to pond

Application 

Date

Date 15-5 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 IR

Flag for 

runoff calc.

RUNOFF total none, monthly or total(average of entire run)

stored as PAapple.out

Chemical: Spirodiclofen

PRZM environment: PAappleC.txt

EXAMS environment: ir298.exv

Metfile: w14737.dvf

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 0.76 0.75 0.71 0.61 0.62 0.30

1962 1.50 1.47 1.38 1.20 1.09 0.58

1963 0.94 0.93 0.88 0.77 0.70 0.43

1964 1.10 1.08 1.02 0.91 0.86 0.46

1965 0.91 0.90 0.84 0.80 0.73 0.41

1966 0.84 0.83 0.80 0.71 0.64 0.35

1967 6.36 6.26 5.88 5.12 4.64 2.00
 11  27

1968 3.30 3.25 3.08 2.70 2.44 1.59

1969 1.31 1.29 1.22 1.13 1.04 0.68

1970 1.22 1.20 1.14 1.01 0.92 0.49

1971 1.20 1.19 1.13 0.98 0.92 0.48

1972 7.22 7.13 6.72 5.87 5.28 2.30

1973 2.65 2.62 2.47 2.15 1.98 1.37

1974 1.81 1.78 1.71 1.49 1.34 0.80

1975 1.35 1.33 1.25 1.11 1.04 0.61

1976 0.89 0.88 0.84 0.78 0.72 0.41

1977 1.79 1.76 1.65 1.43 1.29 0.64

1978 2.07 2.05 1.93 1.74 1.58 0.80

1979 5.85 5.78 5.48 4.79 4.32 1.96

1980 1.43 1.42 1.36 1.25 1.16 0.86

1981 4.10 4.04 3.83 3.34 3.01 1.37

1982 6.31 6.24 5.92 5.19 4.68 2.26

1983 1.82 1.80 1.72 1.54 1.39 1.03

1984 5.86 5.78 5.62 4.96 4.47 2.00

1985 1.43 1.42 1.35 1.24 1.15 0.87

1986 3.71 3.66 3.46 3.02 2.73 1.26

1987 1.18 1.16 1.10 1.00 0.92 0.65

1988 6.75 6.66 6.29 5.48 4.92 2.15

1989 6.07 5.99 5.77 5.12 4.63 2.39

1990 5.83 5.76 5.41 4.70 4.23 2.25

Sorted results

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

0.03 7.22 7.13 6.72 5.87 5.28 2.39

0.06 6.75 6.66 6.29 5.48 4.92 2.30

0.10 6.36 6.26 5.92 5.19 4.68 2.26

0.13 6.31 6.24 5.88 5.12 4.64 2.25

0.16 6.07 5.99 5.77 5.12 4.63 2.15

0.19 5.86 5.78 5.62 4.96 4.47 2.00

0.23 5.85 5.78 5.48 4.79 4.32 2.00

0.26 5.83 5.76 5.41 4.70 4.23 1.96

0.29 4.10 4.04 3.83 3.34 3.01 1.59

0.32 3.71 3.66 3.46 3.02 2.73 1.37

0.35 3.30 3.25 3.08 2.70 2.44 1.37

0.39 2.65 2.62 2.47 2.15 1.98 1.26

0.42 2.07 2.05 1.93 1.74 1.58 1.03

0.45 1.82 1.80 1.72 1.54 1.39 0.87

0.48 1.81 1.78 1.71 1.49 1.34 0.86

0.52 1.79 1.76 1.65 1.43 1.29 0.80

0.55 1.50 1.47 1.38 1.25 1.16 0.80

0.58 1.43 1.42 1.36 1.24 1.15 0.68

0.61 1.43 1.42 1.35 1.20 1.09 0.65

0.65 1.35 1.33 1.25 1.13 1.04 0.64

0.68 1.31 1.29 1.22 1.11 1.04 0.61

0.71 1.22 1.20 1.14 1.01 0.92 0.58

0.74 1.20 1.19 1.13 1.00 0.92 0.49

0.77 1.18 1.16 1.10 0.98 0.92 0.48
 12  27

0.81 1.10 1.08 1.02 0.91 0.86 0.46

0.84 0.94 0.93 0.88 0.80 0.73 0.43

0.87 0.91 0.90 0.84 0.78 0.72 0.41

0.90 0.89 0.88 0.84 0.77 0.70 0.41

0.94 0.84 0.83 0.80 0.71 0.64 0.35

0.97 0.76 0.75 0.71 0.61 0.62 0.30

0.10 6.35 6.26 5.91 5.18 4.68 2.26

Average 

of yearly 

averages:

1.12

Inputs generated by pe4.pl - 8-August-2003

Data used for this run:

Output File: PAapple

Metfile: w14737.dvf

PRZM scenario:PAappleC.txt

EXAMS environment file: ir298.exv

Chemical Name: Spirodiclofen

Description Variable 

Name

Value Units Comments

Molecular 

weight

mwt 411.4 g/mol

Henry's Law 

Const.

henry atm-m^3/mol

Vapor 

Pressure

vapr 5.25E

-07

torr

Solubility sol 6000 mg/L

Kd Kd mg/L

Koc Koc 17.79 mg/L

Photolysis 

half-life

kdp 25.4 days Half-life

Aerobic 

Aquatic 

Metabolism

kbacw 151.6 days Halfife

Anaerobic 

Aquatic 

Metabolism

kbacs days Halfife

Aerobic Soil 

Metabolism

asm 75.8 days Halfife

Hydrolysis: pH 7 0 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation 

Depth:

DEPI 0 cm

Application 

Rate:

TAPP 0.31 kg/ha

Application 

Efficiency:

APPEFF 0.99 fraction

Spray Drift DRFT 0.063 fraction of application rate applied to pond

Application 

Date

Date 15-5 dd/mm or dd/mmm or dd-mm or dd-mmm
 13  27

Record 17: FILTRA

IPSCND 1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index 

Res. Run

IR IR

Flag for 

runoff calc.

RUNOFF total none, monthly or total(average of entire run)

stored as ORapple.out

Chemical: Spirodiclofen PRZM environment: ORappleC.txt

EXAMS environment: ir298.exv

Metfile: w24229.dvf

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 0.71 0.70 0.68 0.61 0.56 0.26

1962 0.85 0.84 0.81 0.74 0.68 0.38

1963 0.88 0.88 0.84 0.76 0.71 0.41

1964 0.90 0.89 0.85 0.78 0.72 0.43

1965 0.90 0.89 0.86 0.78 0.72 0.42

1966 0.90 0.89 0.85 0.80 0.77 0.46

1967 0.92 0.91 0.88 0.79 0.73 0.44

1968 2.12 2.10 2.07 1.90 1.76 0.91

1969 1.17 1.16 1.11 1.02 0.95 0.67

1970 0.96 0.95 0.91 0.82 0.76 0.48

1971 0.92 0.91 0.87 0.79 0.74 0.48

1972 0.94 0.94 0.90 0.82 0.76 0.46

1973 0.90 0.89 0.85 0.77 0.71 0.42

1974 0.89 0.88 0.85 0.77 0.71 0.41

1975 0.89 0.88 0.85 0.77 0.71 0.41

1976 0.89 0.88 0.85 0.77 0.71 0.42

1977 0.99 0.98 0.95 0.90 0.85 0.49

1978 0.94 0.93 0.89 0.81 0.75 0.46

1979 0.90 0.89 0.85 0.77 0.71 0.45

1980 0.94 0.93 0.90 0.85 0.80 0.48

1981 0.91 0.90 0.87 0.85 0.79 0.47

1982 0.91 0.90 0.87 0.78 0.72 0.43

1983 0.89 0.88 0.84 0.76 0.71 0.42

1984 0.94 0.93 0.90 0.85 0.80 0.46

1985 2.16 2.14 2.05 1.83 1.68 0.89

1986 1.18 1.16 1.12 1.01 0.94 0.68

1987 0.97 0.96 0.92 0.83 0.77 0.48

1988 0.90 0.89 0.85 0.81 0.75 0.44

1989 1.12 1.11 1.07 0.97 0.92 0.52

1990 0.94 0.93 0.90 0.83 0.77 0.47

Sorted results
 14  27

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

0.03 2.16 2.14 2.07 1.90 1.76 0.91

0.06 2.12 2.10 2.05 1.83 1.68 0.89

0.10 1.18 1.16 1.12 1.02 0.95 0.68

0.13 1.17 1.16 1.11 1.01 0.94 0.67

0.16 1.12 1.11 1.07 0.97 0.92 0.52

0.19 0.99 0.98 0.95 0.90 0.85 0.49

0.23 0.97 0.96 0.92 0.85 0.80 0.48

0.26 0.96 0.95 0.91 0.85 0.80 0.48

0.29 0.94 0.94 0.90 0.85 0.79 0.48

0.32 0.94 0.93 0.90 0.83 0.77 0.48

0.35 0.94 0.93 0.90 0.83 0.77 0.47

0.39 0.94 0.93 0.90 0.82 0.77 0.47

0.42 0.94 0.93 0.89 0.82 0.76 0.46

0.45 0.92 0.91 0.88 0.81 0.76 0.46

0.48 0.92 0.91 0.87 0.81 0.75 0.46

0.52 0.91 0.90 0.87 0.80 0.75 0.46

0.55 0.91 0.90 0.87 0.79 0.74 0.45

0.58 0.90 0.89 0.86 0.79 0.73 0.44

0.61 0.90 0.89 0.85 0.78 0.72 0.44

0.65 0.90 0.89 0.85 0.78 0.72 0.43

0.68 0.90 0.89 0.85 0.78 0.72 0.43

0.71 0.90 0.89 0.85 0.77 0.71 0.42

0.74 0.90 0.89 0.85 0.77 0.71 0.42

0.77 0.89 0.88 0.85 0.77 0.71 0.42

0.81 0.89 0.88 0.85 0.77 0.71 0.42

0.84 0.89 0.88 0.85 0.77 0.71 0.41

0.87 0.89 0.88 0.84 0.76 0.71 0.41

0.90 0.88 0.88 0.84 0.76 0.71 0.41

0.94 0.85 0.84 0.81 0.74 0.68 0.38

0.97 0.71 0.70 0.68 0.61 0.56 0.26

0.10 1.17 1.16 1.12 1.02 0.95 0.68

Average 

of yearly 

averages:

0.49

Inputs generated by pe4.pl - 8-August-2003

Data used for this run:

Output File: ORapple

Metfile: w24229.dvf

PRZM scenario:ORappleC.txt

EXAMS environment file: ir298.exv

Chemical Name: Spirodiclofen

Description Variable 

Name

Value Units Comments

Molecular 

weight

mwt 411.4 g/mol

Henry's Law 

Const.

henry atm-m^3/mol
 15  27

Vapor 

Pressure

vapr 5.25E

-07

torr

Solubility sol 6000 mg/L

Kd Kd mg/L

Koc Koc 17.79 mg/L

Photolysis 

half-life

kdp 25.4 days Half-life

Aerobic 

Aquatic 

Metabolism

kbacw 151.6 days Halfife

Anaerobic 

Aquatic 

Metabolism

kbacs days Halfife

Aerobic Soil 

Metabolism

asm 75.8 days Halfife

Hydrolysis: pH 7 0 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation 

Depth:

DEPI 0 cm

Application 

Rate:

TAPP 0.31 kg/ha

Application 

Efficiency:

APPEFF 0.99 fraction

Spray Drift DRFT 0.063 fraction of application rate applied to pond

Application 

Date

Date 15-5 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 IR

Flag for 

runoff calc.

RUNOFF total none, monthly or total(average of entire run)

stored as GAPecan.out

Chemical: Spirodiclofen

PRZM environment: GAPecansC.txt

EXAMS environment: ir298.exv

Metfile: w93805.dvf

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 1.36 1.30 1.18 0.92 0.76 0.25

1962 1.37 1.32 1.16 1.02 0.87 0.29

1963 7.05 6.86 6.09 4.61 3.80 1.23

1964 2.65 2.56 2.24 1.71 1.51 0.56

1965 2.73 2.64 2.33 1.78 1.56 0.56
 16  27

1966 7.32 7.10 6.26 4.75 3.91 1.28

1967 17.53 17.00 14.93 11.29 9.30 3.03

1968 1.48 1.43 1.36 1.07 0.89 0.40

1969 2.59 2.51 2.22 1.69 1.39 0.45

1970 1.48 1.43 1.31 1.11 0.93 0.32

1971 2.10 2.04 1.80 1.41 1.17 0.39

1972 3.86 3.75 3.33 2.56 2.11 0.68

1973 4.88 4.73 4.17 3.15 2.59 0.88

1974 14.20 13.77 12.11 9.19 7.58 2.45

1975 2.97 2.89 2.57 1.98 1.64 0.61

1976 2.23 2.16 1.92 1.51 1.26 0.43

1977 5.55 5.38 4.71 3.54 2.91 0.99

1978 1.40 1.36 1.23 0.96 0.79 0.30

1979 5.28 5.12 4.51 3.51 2.92 0.97

1980 2.85 2.78 2.46 1.88 1.57 0.54

1981 1.38 1.34 1.18 0.92 0.77 0.27

1982 2.77 2.69 2.39 1.86 1.59 0.53

1983 16.86 16.36 14.42 10.96 9.02 2.88

1984 3.50 3.43 3.04 2.31 1.95 0.74

1985 1.64 1.59 1.42 1.17 0.98 0.34

1986 2.71 2.63 2.31 1.79 1.49 0.49

1987 5.83 5.65 4.98 3.80 3.13 1.01

1988 1.39 1.35 1.20 0.91 0.75 0.27

1989 3.50 3.40 3.00 2.28 1.92 0.63

1990 1.38 1.34 1.18 0.92 0.77 0.27

Sorted results

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

0.03 17.53 17.00 14.93 11.29 9.30 3.03

0.06 16.86 16.36 14.42 10.96 9.02 2.88

0.10 14.20 13.77 12.11 9.19 7.58 2.45

0.13 7.32 7.10 6.26 4.75 3.91 1.28

0.16 7.05 6.86 6.09 4.61 3.80 1.23

0.19 5.83 5.65 4.98 3.80 3.13 1.01

0.23 5.55 5.38 4.71 3.54 2.92 0.99

0.26 5.28 5.12 4.51 3.51 2.91 0.97

0.29 4.88 4.73 4.17 3.15 2.59 0.88

0.32 3.86 3.75 3.33 2.56 2.11 0.74

0.35 3.50 3.43 3.04 2.31 1.95 0.68

0.39 3.50 3.40 3.00 2.28 1.92 0.63

0.42 2.97 2.89 2.57 1.98 1.64 0.61

0.45 2.85 2.78 2.46 1.88 1.59 0.56

0.48 2.77 2.69 2.39 1.86 1.57 0.56

0.52 2.73 2.64 2.33 1.79 1.56 0.54

0.55 2.71 2.63 2.31 1.78 1.51 0.53

0.58 2.65 2.56 2.24 1.71 1.49 0.49

0.61 2.59 2.51 2.22 1.69 1.39 0.45

0.65 2.23 2.16 1.92 1.51 1.26 0.43

0.68 2.10 2.04 1.80 1.41 1.17 0.40

0.71 1.64 1.59 1.42 1.17 0.98 0.39
 17  27

0.74 1.48 1.43 1.36 1.11 0.93 0.34

0.77 1.48 1.43 1.31 1.07 0.89 0.32

0.81 1.40 1.36 1.23 1.02 0.87 0.30

0.84 1.39 1.35 1.20 0.96 0.79 0.29

0.87 1.38 1.34 1.18 0.92 0.77 0.27

0.90 1.38 1.34 1.18 0.92 0.77 0.27

0.94 1.37 1.32 1.18 0.92 0.76 0.27

0.97 1.36 1.30 1.16 0.91 0.75 0.25

0.10 13.51 13.10 11.53 8.75 7.21 2.34

Average 

of yearly 

averages:

0.80

Inputs generated by pe4.pl - 8-August-2003

Data used for this run:

Output File: GAPecan Metfile: w93805.dvf

PRZM scenario:GAPecansC.txt

EXAMS environment file: ir298.exv

Chemical Name: Spirodiclofen

Description Variable 

Name

Value Units Comments

Molecular 

weight

mwt 411.4 g/mol

Henry's Law 

Const.

henry atm-m^3/mol

Vapor 

Pressure

vapr 5.25E

-07

torr

Solubility sol 6000 mg/L

Kd Kd mg/L

Koc Koc 17.79 mg/L

Photolysis 

half-life

kdp 25.4 days Half-life

Aerobic 

Aquatic 

Metabolism

kbacw 151.6 days Halfife

Anaerobic 

Aquatic 

Metabolism

kbacs days Halfife

Aerobic Soil 

Metabolism

asm 75.8 days Halfife

Hydrolysis: pH 7 0 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation 

Depth:

DEPI 0 cm

Application 

Rate:

TAPP 0.59 kg/ha

Application 

Efficiency:

APPEFF 0.99 fraction
 18  27

Spray Drift DRFT 0.063 fraction of application rate applied to pond

Application 

Date

Date 15-5 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 IR

Flag for 

runoff calc.

RUNOFF total none, monthly or total(average of entire run)

stored as GApeach.out

Chemical: Spirodiclofen

PRZM environment: GAPeachesC.txt

EXAMS environment: ir298.exvMetfile: w03813.dvf

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 0.71 0.70 0.67 0.60 0.55 0.24

1962 2.54 2.51 2.36 2.05 1.85 0.86

1963 2.72 2.68 2.53 2.21 2.00 1.08

1964 1.13 1.12 1.06 0.92 0.84 0.59

1965 0.88 0.87 0.83 0.76 0.70 0.40

1966 1.01 1.00 0.95 0.85 0.77 0.41

1967 1.44 1.42 1.34 1.18 1.08 0.58

1968 6.67 6.59 6.27 5.51 5.00 2.29

1969 1.75 1.74 1.69 1.58 1.50 1.07

1970 0.98 0.96 0.92 0.81 0.73 0.45

1971 5.03 4.97 4.72 4.13 3.73 1.66

1972 1.65 1.63 1.55 1.36 1.33 0.96

1973 2.53 2.50 2.36 2.06 1.86 0.97

1974 4.10 4.05 3.83 3.37 3.06 1.52

1975 1.44 1.42 1.35 1.21 1.11 0.80

1976 4.55 4.50 4.32 3.84 3.48 1.63

1977 1.40 1.39 1.31 1.15 1.07 0.80

1978 0.91 0.90 0.86 0.76 0.69 0.40

1979 0.84 0.83 0.79 0.70 0.64 0.34

1980 0.83 0.82 0.78 0.68 0.61 0.32

1981 1.94 1.91 1.78 1.54 1.39 0.68

1982 1.04 1.02 0.99 0.88 0.79 0.50

1983 1.53 1.51 1.43 1.24 1.11 0.58

1984 2.13 2.11 1.98 1.73 1.56 0.81

1985 1.03 1.02 0.96 0.84 0.76 0.49

1986 0.85 0.84 0.80 0.69 0.62 0.34

1987 0.83 0.81 0.77 0.74 0.69 0.36

1988 0.85 0.84 0.80 0.71 0.65 0.36

1989 0.84 0.83 0.79 0.69 0.63 0.34
 19  27

1990 0.83 0.82 0.78 0.68 0.61 0.32

Sorted results

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

0.03 6.67 6.59 6.27 5.51 5.00 2.29

0.06 5.03 4.97 4.72 4.13 3.73 1.66

0.10 4.55 4.50 4.32 3.84 3.48 1.63

0.13 4.10 4.05 3.83 3.37 3.06 1.52

0.16 2.72 2.68 2.53 2.21 2.00 1.08

0.19 2.54 2.51 2.36 2.06 1.86 1.07

0.23 2.53 2.50 2.36 2.05 1.85 0.97

0.26 2.13 2.11 1.98 1.73 1.56 0.96

0.29 1.94 1.91 1.78 1.58 1.50 0.86

0.32 1.75 1.74 1.69 1.54 1.39 0.81

0.35 1.65 1.63 1.55 1.36 1.33 0.80

0.39 1.53 1.51 1.43 1.24 1.11 0.80

0.42 1.44 1.42 1.35 1.21 1.11 0.68

0.45 1.44 1.42 1.34 1.18 1.08 0.59

0.48 1.40 1.39 1.31 1.15 1.07 0.58

0.52 1.13 1.12 1.06 0.92 0.84 0.58

0.55 1.04 1.02 0.99 0.88 0.79 0.50

0.58 1.03 1.02 0.96 0.85 0.77 0.49

0.61 1.01 1.00 0.95 0.84 0.76 0.45

0.65 0.98 0.96 0.92 0.81 0.73 0.41

0.68 0.91 0.90 0.86 0.76 0.70 0.40

0.71 0.88 0.87 0.83 0.76 0.69 0.40

0.74 0.85 0.84 0.80 0.74 0.69 0.36

0.77 0.85 0.84 0.80 0.71 0.65 0.36

0.81 0.84 0.83 0.79 0.70 0.64 0.34

0.84 0.84 0.83 0.79 0.69 0.63 0.34

0.87 0.83 0.82 0.78 0.69 0.62 0.34

0.90 0.83 0.82 0.78 0.68 0.61 0.32

0.94 0.83 0.81 0.77 0.68 0.61 0.32

0.97 0.71 0.70 0.67 0.60 0.55 0.24

0.10 4.50 4.45 4.27 3.79 3.44 1.62

Average 

of yearly 

averages:

0.74

Inputs generated by pe4.pl - 8-August-2003

Data used for this run:

Output File: GApeach

Metfile: w03813.dvf

PRZM scenario:GAPeachesC.txt

EXAMS environment file: ir298.exv

Chemical Name: Spirodiclofen

Description Variable 

Name

Value Units Comments

Molecular 

weight

mwt 411.4 g/mol
 20  27

Henry's Law 

Const.

henry atm-m^3/mol

Vapor 

Pressure

vapr 5.25E

-07

torr

Solubility sol 6000 mg/L

Kd Kd mg/L

Koc Koc 17.79 mg/L

Photolysis 

half-life

kdp 25.4 days Half-life

Aerobic 

Aquatic 

Metabolism

kbacw 151.6 days Halfife

Anaerobic 

Aquatic 

Metabolism

kbacs days Halfife

Aerobic Soil 

Metabolism

asm 75.8 days Halfife

Hydrolysis: pH 7 0 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation 

Depth:

DEPI 0 cm

Application 

Rate:

TAPP 0.31 kg/ha

Application 

Efficiency:

APPEFF 0.99 fraction

Spray Drift DRFT 0.063 fraction of application rate applied to pond

Application 

Date

Date 15-5 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 IR

Flag for 

runoff calc.

RUNOFF total none, monthly or total(average of entire run)

stored as CAgrape.out

Chemical: Spirodiclofen

PRZM environment: CAgrapesC.txt

EXAMS environment: ir298.exv

Metfile: w93193.dvf
 21  27

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 1.36 1.34 1.30 1.18 1.09 0.54

1962 1.91 1.90 1.84 1.68 1.56 0.98

1963 1.90 1.89 1.83 1.68 1.57 0.99

1964 1.93 1.91 1.85 1.70 1.58 1.03

1965 2.02 2.00 1.93 1.78 1.66 1.09

1966 1.95 1.93 1.86 1.69 1.57 1.00

1967 1.91 1.89 1.83 1.67 1.54 0.96

1968 1.89 1.87 1.81 1.64 1.51 1.05

1969 2.19 2.17 2.09 1.92 1.78 1.21

1970 1.98 1.96 1.89 1.72 1.58 1.03

1971 2.08 2.07 2.00 1.88 1.75 1.11

1972 2.02 2.00 1.91 1.85 1.73 1.11

1973 1.99 1.97 1.90 1.71 1.58 1.04

1974 1.92 1.91 1.84 1.67 1.54 1.01

1975 2.05 2.03 1.96 1.79 1.66 1.10

1976 1.98 1.96 1.89 1.73 1.61 1.06

1977 1.97 1.96 1.90 1.72 1.59 1.02

1978 1.91 1.89 1.82 1.66 1.58 1.18

1979 2.28 2.26 2.17 1.97 1.81 1.26

1980 1.95 1.93 1.87 1.71 1.58 1.00

1981 1.88 1.87 1.80 1.61 1.47 0.91

1982 1.84 1.83 1.76 1.62 1.50 1.04

1983 2.16 2.14 2.07 1.88 1.74 1.18

1984 1.93 1.91 1.84 1.66 1.52 0.95

1985 1.82 1.81 1.74 1.56 1.43 0.87

1986 1.81 1.80 1.73 1.56 1.43 0.87

1987 5.97 5.92 5.69 5.14 4.77 2.45

1988 2.94 2.92 2.83 2.58 2.37 1.81

1989 2.12 2.10 2.03 1.85 1.70 1.20

1990 3.74 3.71 3.55 3.19 2.93 1.70

Sorted results

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

0.03 5.97 5.92 5.69 5.14 4.77 2.45

0.06 3.74 3.71 3.55 3.19 2.93 1.81

0.10 2.94 2.92 2.83 2.58 2.37 1.70

0.13 2.28 2.26 2.17 1.97 1.81 1.26

0.16 2.19 2.17 2.09 1.92 1.78 1.21

0.19 2.16 2.14 2.07 1.88 1.75 1.20

0.23 2.12 2.10 2.03 1.88 1.74 1.18

0.26 2.08 2.07 2.00 1.85 1.73 1.18

0.29 2.05 2.03 1.96 1.85 1.70 1.11

0.32 2.02 2.00 1.93 1.79 1.66 1.11

0.35 2.02 2.00 1.91 1.78 1.66 1.10

0.39 1.99 1.97 1.90 1.73 1.61 1.09

0.42 1.98 1.96 1.90 1.72 1.59 1.06

0.45 1.98 1.96 1.89 1.72 1.58 1.05
 22  27

0.48 1.97 1.96 1.89 1.71 1.58 1.04

0.52 1.95 1.93 1.87 1.71 1.58 1.04

0.55 1.95 1.93 1.86 1.70 1.58 1.03

0.58 1.93 1.91 1.85 1.69 1.58 1.03

0.61 1.93 1.91 1.84 1.68 1.57 1.02

0.65 1.92 1.91 1.84 1.68 1.57 1.01

0.68 1.91 1.90 1.84 1.67 1.56 1.00

0.71 1.91 1.89 1.83 1.67 1.54 1.00

0.74 1.91 1.89 1.83 1.66 1.54 0.99

0.77 1.90 1.89 1.82 1.66 1.52 0.98

0.81 1.89 1.87 1.81 1.64 1.51 0.96

0.84 1.88 1.87 1.80 1.62 1.50 0.95

0.87 1.84 1.83 1.76 1.61 1.47 0.91

0.90 1.82 1.81 1.74 1.56 1.43 0.87

0.94 1.81 1.80 1.73 1.56 1.43 0.87

0.97 1.36 1.34 1.30 1.18 1.09 0.54

0.10 2.88 2.85 2.76 2.52 2.32 1.66

Average 

of yearly 

averages:

1.12

Inputs generated by pe4.pl - 8-August-2003

Data used for this run:

Output File: CAgrape

Metfile: w93193.dvf

PRZM scenario:CAgrapesC.txt

EXAMS environment file: ir298.exv

Chemical Name: Spirodiclofen

Description Variable 

Name

Value Units Comments

Molecular 

weight

mwt 411.4 g/mol

Henry's Law 

Const.

henry atm-m^3/mol

Vapor 

Pressure

vapr 5.25E

-07

torr

Solubility sol 6000 mg/L

Kd Kd mg/L

Koc Koc 17.79 mg/L

Photolysis 

half-life

kdp 25.4 days Half-life

Aerobic 

Aquatic 

Metabolism

kbacw 151.6 days Halfife

Anaerobic 

Aquatic 

Metabolism

kbacs days Halfife

Aerobic Soil 

Metabolism

asm 75.8 days Halfife

Hydrolysis: pH 7 0 days Half-life
 23  27

Method: CAM 2 integer See PRZM manual

Incorporation 

Depth:

DEPI 0 cm

Application 

Rate:

TAPP 0.59 kg/ha

Application 

Efficiency:

APPEFF 0.99 fraction

Spray Drift DRFT 0.063 fraction of application rate applied to pond

Application 

Date

Date 15-5 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 IR

Flag for 

runoff calc.

RUNOFF total none, monthly or total(average of entire run)
 24  27

Appendix A-2. Truncated PRZM/EXAMS Time-Series Output

stored as FlcitrusTS.out

Chemical: Spirodiclofen

PRZM environment: FLcitrusC.txt

EXAMS environment: ir298.exv

Time-Seris-Surface Water

Day Date Conc 

(mg/L)

0 1/1/61 0.00E+00

1 1/2/61 0.00E+00

2 1/3/61 0.00E+00

3 1/4/61 0.00E+00

4 1/5/61 0.00E+00

5 1/6/61 0.00E+00

6 1/7/61 0.00E+00

7 1/8/61 0.00E+00

8 1/9/61 0.00E+00

9 1/10/61 0.00E+00

10 1/11/61 0.00E+00

11 1/12/61 0.00E+00

12 1/13/61 0.00E+00

13 1/14/61 0.00E+00

14 1/15/61 0.00E+00

15 1/16/61 0.00E+00

16 1/17/61 0.00E+00

17 1/18/61 0.00E+00

18 1/19/61 0.00E+00

19 1/20/61 0.00E+00

20 1/21/61 0.00E+00

21 1/22/61 0.00E+00

22 1/23/61 0.00E+00

23 1/24/61 0.00E+00

24 1/25/61 0.00E+00

25 1/26/61 0.00E+00

26 1/27/61 0.00E+00

27 1/28/61 0.00E+00

28 1/29/61 0.00E+00

29 1/30/61 0.00E+00

30 1/31/61 0.00E+00

**  

**  ** **

  ** 

**  

10926 12/1/90 1.34E-04

10927 12/2/90 1.33E-04

10928 12/3/90 1.31E-04

10929 12/4/90 1.31E-04

10930 12/5/90 1.29E-04
 25  27

Time-Seris-Surface Water

Day Date Conc 

(mg/L)

10931 12/6/90 1.28E-04

10932 12/7/90 1.26E-04

10933 12/8/90 1.25E-04

10934 12/9/90 1.24E-04

10935 12/10/90 1.23E-04

10936 12/11/90 1.21E-04

10937 12/12/90 1.20E-04

10938 12/13/90 1.19E-04

10939 12/14/90 1.17E-04

10940 12/15/90 1.17E-04

10941 12/16/90 1.16E-04

10942 12/17/90 1.14E-04

10943 12/18/90 1.13E-04

10944 12/19/90 1.12E-04

10945 12/20/90 1.10E-04

10946 12/21/90 1.10E-04

10947 12/22/90 1.09E-04

10948 12/23/90 1.08E-04

10949 12/24/90 1.06E-04

10950 12/25/90 1.05E-04

10951 12/26/90 1.04E-04

10952 12/27/90 1.04E-04

10953 12/28/90 1.03E-04

10954 12/29/90 1.01E-04

10955 12/30/90 1.00E-04

10956 12/31/90 9.92E-05

10957 1/1/91 9.83E-05
 26  27

APPENDIX A-3. SCIGROW OUTPUT FILE

 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:Spirodiclofen

time is 12/ 7/2004 10:21:48

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

 Application Number of Total Use Koc Soil Aerobic

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

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

 0.530 1.0 0.530 1.57E+01 25.7

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

groundwater screening cond (ppb) = 4.35E-01 

** **********************************************************************
27

APPENDIX B. Half-life Calculation Methods for Spirodiclofen Total Residue Analysis

First-order linear regression analysis

Half-lives were calculated using natural log-transformed (weighted) concentration data from all 

samples that were greater than the detection limit and using all sampling intervals. A regression 

line is fitted for the data using the first-order two-parameter linear regression equation:

y = -bx + a

where a is the y-intercept and b is the rate constant (slope).

For spirdiclofen total residues of concern, the concentrations of spirodiclofen, and its -enol, 

-dihydroxy, and -ketohydroxy transformation products were summed. Not all transformation 

products were identified and quantified in all studies.