1 OFFICE OF PREVENTION, PESTICIDES AND T OXIC SUBSTANCES UNITED ST AT ES ENVIRONMENT AL PROTECTION A GENCY

WA SHINGTON D.C., 20460

PC Code: 128008 DP Barcode: 367184 Date: September 24 , 200 9 MEMORANDUM SUBJECT: Drinkin g Water Exposure Assessment for New Uses of Boscalid on Alfalfa

Forage and Ha y, Citrus group 10, and an Increase in Tolerance on Stone F ruit group 12. TO: Br yant Crowe, Risk Manager Reviewer (RM Team 22)

Fungicide Branch/Registration Division (7505P) Tony Kish , Risk Manager (RM Team 22) Fungicide Branch/Registration Divi sion (7505P) FROM: David L ieu, Chemist Trainee

Environmental Risk Branch IV Environmental Fate and Effects Division (7507P) REVIEWED BY: R. David Jones, Ph.D. Senior Agronomist

Environmental Risk Branch IV Environmental Fate and Effects Divi sion (7507P) APPROVED BY: Elizabeth Behl, Branch Chief

Environmental Risk Branch IV Environmental Fate and Effects Division (7507P ) Executive Summary This memo includes a drinking water exposure assessment for proposed new use s of boscalid (PC code : 128008) on alfalfa forage and hay , and citrus group 10. The petition also requested an increase in tolerance on stone fruit (crop group 12 ) based on residues exceeding the 1.7 ppm tolerance found in samples of sweet and tart cherries and in peaches from field trials conducted b y BASF. The proposed increase in tolerance to stone fruit group does not necessitate a change to the label and therefore does not trigger the need for a new drinking water assessment. Previous drinking water assessments have estim ated drinking water concentrations (EDWCs) for boscalid in surface water and groundwater using the screening models FIRST and2

the regression model SCI
- GROW. Three previous assessments (D336183, D341459 and D343753) have all used application to turf as the maximum application rate allowed. The proposed new uses on alfalfa (forage and hay) and citrus (crop group 10 ) have lower maximum rates per application than that on turf. The recommended EDWCs based on the existing turf use are listed in Table 1. The half
- life for boscalid was recalculated to include unextractable residues, which affected the input parameters for calculating EDWCs in SCI GROW and FIRST. Table 1. Maximum Tier 1 Estimated Drinking Water Concentrations (EDWCs) for drinking water assessment b ased on aerial application of boscalid on turf. Drinking Water Source (Model used) Use/rate Modeled (lb a.i./A) Estimated Drinking Water Concentration (EDWC; ppb) Groundwater (SCI
GROW2) Ground spray /0.35 x 6 applications; annual total of 2.1 Acute and Ch ronic 1. 51 Surface Water (FIRST) Ground spray /0.35 x 6 applications; annual total of 2.1 Acute 105. 3 Ground spray

/0.35 x 6 applications; annual total of 2.1 Chronic 30.2

Problem Formulation This is a Tier I drinking water assessment that uses modeli ng and available monitoring data to estimate the ground water and surface water concentrations of pesticides in drinking water source water (pre
- treatment) resulting from pesticide use on sites that are highl y vulnerable. This initial tier screens out chem icals with low potential risk. Analysis Use Characterization Boscalid is currentl y registered for use on alfalfa, dry and succulent beans, berries, head and stem brassicas, leafy

brassica greens, bulb vegetables, canola, carrots, celery , citrus fruits, cotton, cucurbit vegetables, fruiting vegetables , grapes, hops, leafy greens, leafy

petioles, lettuce, peanuts, succulent and dried shelled peas, pistachios , pome fruit, potatoes, root and tuber vegetables , certain seed treatments, soy bean s , spinach , stone fruit, strawberries, sunflowers, tree nuts , tropical fruits , turf, and ornamentals. Boscalid is mixed with a second active ingredient, Py raclostrobin, in Pristine Reg. No. 7969
- 199 and Endura Reg. No. 7969
- 197. Boscalid is applied aerially

or through ground equipment
. The proposed new uses for alfalfa (forage and hay) and citrus group 10 have a maximum seasonal application rate less than that previously allowed for turf (1.44 lbs a.i./A/season for Alfalfa, Endura Reg. # 7969
- 197, compared to 2.1 lbs a.i./A/season for turf). This information is summarized in Table 2.3

Table 2 . Application rates for the proposed new uses of boscalid on alfalfa, citrus (group 10) and the maximum current use rate for turf. Crop Type Single

Maximum Application Rate (lbs a.i./A) Maximum

Number of Application Maximum

Seasonal Application Rate (lbs a.i./A/season) Minimum

Interval Between Applications (days) Application

Method
Alfalfa (Pristine, Reg. # 7969
- 199) 0.28 3 0.85 14 Aerial Spray
Alfalfa (Endura, Reg. #7969
- 197) 0.48 3 1.44 14 Aerial Spray Citrus, group 10 (Pristine, Reg. # 7969
- 199) 0.29 4 1.17 10 Aerial Spray
Turf (reference DP Barcode: D343753) 0.35 6 2.1 14 Ground Spray Environmental Fate and Transport Characterization Boscalid , o (2
- chloro
- N
- (4  ́
- chlorobiphen yl
- 2
- yl )
- nicotinamide nicotinamide
- IUPAC name) 2
- chloro
- N
- (4’chloro(1,1’
- biphen yl )2
- yl
- 3
- py ridinecarboxamide
- CAS name) is a persistent compound with low mobility in most soils. The primary degradation pathway

is aerobic soil metabolism, which proceeds s lowly and results in the formation of intermediates which are relativel y rapidl y transformed into CO 2 or were in unextracted unidentified soil residues. In anaerobic soil, boscalid is degraded very slowl y and is considered to be stable to microbial degradation as the disappearance of the parent compound was mainly due to conversion to unextracted, unidentified residues
. There is no significant degradation of b oscalid and by photoly sis on soil and in water. The compound is also not transformed to any signifi cant extent in either aerobic or anaerobic aquatic s ys tems. Boscalid is also no significant hy drol ys is at environmentally

relevant pHs and temperatures. Boscalid may sorb to aquatic sediments given its moderate soil mobility (Koc ranges from 507 to 1110mL/ g). Terrestrial field dissipation studies show that the maximum leaching depth for boscalid ranged from 0
- 7.5 cm (MRIDs 454052
- 19,
- 20,
- 21,
- 22;EPA, 2003). These data support results from batch equilibrium studies that indicate moderate mobility in soil. A higher potential for leaching exists for the compound in soils which are low in organic matter content, as is often the case with coarse
- textured soils. Boscalid is likely

to reach surface water through spray drift when applied using ground and aerial sp ray . Given its persistence, transport of boscalid to surface water via runoff water is probably . The slow biodegradation of boscalid in most soils will increase the potential for both groundwater and surface water contamination. Because boscalid does not b iodegrade in aquatic sy stems, but can bind to sediments, the compound may accumulate in the sediment phase of these environments (MRIDs 45405213 and 45405214). The boscalid degradate 2
- chloronicotinic4

acid is very

mobile in soil and is not expected to bind to aquatic sediments. However, the degradate is metabolized rapidly in aerobic soil, and is mineralized to CO 2 or transformed to bound residues. A summary of the fate and transport properties can be found below in Table 3. More details on the environment al fate and transport of boscalid can be found in the original environmental fate and ecological risk assessment performed for registration, titled “Environmental Fate and Ecological Risk Assessment for the Registration of BAS 510F (Nicobifen): 2
- chloro
- N
- (4’chloro(1,1’
- biphen yl )
- 2
- yl
- 3
- py ridinecarboxamide”. Table 3. Summary of physical/chemical and environmental fate and transport properties of boscalid. PARAMETER VALUE(S) (units) SOURCE COMMENT Chemical Name boscalid
- - Molecular Weight 343.2 g/mole
- - Solubility (20oC) 6 mg/L MRI D 45405205
- Vapor Pressure (25 oC) <1x10 - 8 torr (<1x10 - 6 Pa ) - - Hydrolysis Half

- life (pH 5, 7, 9; (25oC) no signficant degradation MRI D 45405205 Stable at all pHs. Aqueous Photolysis half - life no signficant degradation MRI D 45405206
- Soil Photolysis Half - life no signficant

degradation MRI D 45405207
- Aerobic Soil Metabolism Half

life for Parent only (days ) 182, 578, 408 , 289 MRI D s

45405208 (Supplemental) 45405209 (Supplemental) 45643802 (Acceptable) -
Aerobic Soil M etabolism Half

life for Parent and unextracted residues (days ) 1000, 1609, 848, 2553 MRI Ds

45405208(Supplemental) 45405209(Supplemental) 45643802(Acceptable) t 1/2 were calculated incorporating unextracted residues to the total extractable residues Aero bic Aquatic Metabolism Half

life no signficant degradation MRI D 45405214 Study was classified as supplemental Anaerobic Aquatic Metabolism Half

life no signficant degradation MRI D 45405213
- Organic Carbon Partition Coefficient (Koc ) in mL/g 507 ( s and y l oam) 594 ( l oamy

sand) 655 ( s oam) 776 ( s and y cla y loam) 987 ( s oamy

sand) 1110 ( s and y/ loamy sand) MRI Ds

45405216 (Supplemental) 45405217 (Supplemental) Supplemental status due to absence of material balance data.5

Soil Par t ition Coefficient (Kd ) in mL/g 3.3 ( l oam) 3.9 ( l oamy

sand) 6.5 ( l oamy

sand) 7.6 ( s and y loam) 26.4 ( s and y cla y loam) 27.8 ( s and y/ loamy sand) MRI Ds

45405216(Supplemental) 45405217 (Supplemental) Supplemental status due to absence of material balance data.
Drinking Water Exposure Modeling SCI G ROW (Screening Concentration in Ground Water) is a regression model used as a screening tool to estimate pesticide concentrations found in ground water used as drinking water. SCI GROW was developed by fitting a linear model to groundwater concentrations wi th the Relative Index of Leaching Potential (RILP) as the independent variable. Groundwater 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 s oil
- water partition coefficient. The output of SCI GROW represents the concentrations that might be expected in shallow unconfined aquifers under sand y soils, which is representative of the ground water most vulnerable to pesticide contamination likely to s erve as a drinking water source. FIRST (FQPA Index Reservoir Screening Tool) is a metamodel of PRZM and EXAMS used as a screening tool to estimate pesticide concentrations found in surface water used as drinking water. FIRST was developed b y making multi ple runs of PRZM using varying sorption coefficients and determining the concentration in the EXAMS index reservoir scenario after a two - inch single storm event. (The Index Reservoir is a standard water body used by the Office of Pesticide Programs to asse ss drinking water exposure (office of Pesticide Programs, 2002). It is based on a real reservoir (albeit not currently in active use as a drinking water supply), Shipman City lake in Illinois, that is known to be vulnerable to pesticide contamination.) The single runoff event moves a maximum of 8% of the applied pesticide into the reservoir. This amount can be reduced b y degradation or effects of binding to soil in the field. Additionally , FI RST can account for spray drift and adjusts for the area within a watershed that is planned with the modeled crop (percent Cropped Area). Spray drift (modeled as direct deposition of the pesticide into the reservoir) is assumed to be 16% of the applied active ingredient for aerial application, 6.3% for orchard air blast application, and 6.4% for other ground spray application. Despite being a single even model, FI RST can account for spray drift from multiple applications. The default a Percent Cropped Area (PCA) is 87% for agricultural crops
. The default PCA for turf is 1 .0 since turf is often grown on land that is not agricultural. The PRZM scenario used for FIRST development was among the most vulnerable, and thus resulting surface water concentration represents the upper bound values on the concentrations that might be found in drinking water from the use of a pesticide. Modeling Approach and Input Parameters The following Tables 4 and 5 represent the input parameters used for the surface and groundwater modeling applications, SCIGROW and FIRST. The input parameter fo r aerobic soil6

metabolism was calculated both as parent only and as parent plus unextracted residues. The parent plus unextracted residue half
- life was calculated using the total toxic residues ( TTR) method ( Scientific Advisory Panel “White P aper on Method s for Assessing Ecological Risks of Pesticides with Persistent, Bioaccumulative and Toxic Characteristics” ). The unextracted residues in some s tudies were over 50%. There is insufficient information to verify that the extraction methods used , methanol and then methanol and water , were efficiently extracted all unbound residues. Then the EECs in Table 6. are based on the TTR method. The calculations are in Appendix A. Table 4. SCI - GROW input parameter values for boscalid use on Alfalfa (Hay and Forage), Cit rus (group 10) and Turf . Model Input Parameter (units) Input Values Source Comments Application Rate (lbs a.i./A/application) 0.28 (Alfalfa, Pristine ® ) 0.48 (Alfalfa, Endura ® ) 0.29 (Citrus, Pristine ® ) 0.35 (Turf, DP D343753) Proposed Label
-
Maximum No. of Applications/Year 3 (Alfalfa, Pristine ® ) 3 (Alfalfa, Endura ® ) 4 (Citrus, Pristine ® ) 6 (Turf, DP D343753) Proposed Label
- Organic Carbon Normalized Partition Coefficient Koc (mL/g ) 821 MRI D 45405216 Represents the median value for six soils. Aerobic Soil Metabolism Half

- life (day s) 1503 (Parent + Unextracted)* 364 (Parent Onl y) MRI Ds

45405208(Supplemental) 45405209(Supplemental) 45405210(Unacceptable) 45643802(Acceptable) Mean of four values in the acceptable study
. * Value represents total toxic residues which include parent and unextracted residues which we assume to be unextracted parent residues . Table 5 . FIRST input parameter values for boscalid use on Alfalfa (Hay and Forage), Citrus (group 10) and Turf . Parameter (units) Value (s) Source Com ment s Application Rate (lb a.i./A) 0.28 (Alfalfa, Pristine ® ) 0.48 (Alfalfa, Endura ® ) 0.29 (Citrus, Pristine ® ) 0.35 (Turf, DP D343753) Proposed Label
-
Number of Applications 3 (Alfalfa, Pristine ® ) 3 (Alfalfa, Endura ® ) 4 (Citrus, Pristine ® ) 6 (Turf, DP D3 43753) Proposed Label
-
Interval between Applications (day s) 14 (Alfalfa, Pristine ® ) 14 (Alfalfa, Endura ® ) Proposed Label
-7 10 (Citrus, Pristine ® ) 14 (Turf, DP D343753) Percent Cropped Area (decimal) 0.87 ( Alfalfa & Citrus ) 1.0 (Turf) EFED PCA Guidance N o PCA Factors for Non
agricultural use sites (Turf) Organic Carbon Partition Coefficient (Koc; L/kg
- oc) 655 MRI D 45405216 Represents the lowest non
sand Koc for six soils Aerobic Soil Metabolism Half

- life (day s) 2073 (Parent + Unextracted) * 490 (Parent Onl y) MRI Ds

45405208(Supplemental) 45405209(Supplemental) 45405210(Unacceptable) 45643802(Acceptable) 90 th percentile of the upper confidence bound on the mean half
- life of four soils Wetted in: No Input parameter guidance
- Depth of Incorporation (inc hes) 0 Input parameter guidance
- Method of Application A e ri a l spray (Alfalfa & Citrus) Ground spray

(Turf, DP D343753) Proposed Label
- Solubility in water (mg/L or ppm) 6 MRI D 45405205 pH 5
- 7, 20oC Aerobic Aquatic Metabolism Half

- life (day s) 4146 (Par ent + Unextracted) ** 980 (Parent Onl y) Input parameter guidance Twice the aerobic soil metabolism Hy droly sis half

- life (day s) 0 MRI D 45405205 Stable Aquatic Photoly sis Half
- life @ pH 7 (day s) 0 MRI D 45405206 Stable * Value represents total toxic residu es which include parent and unextracted residues. ** Value was affected by the new aerobic soil metabolism input Modeling Results SCI GROW concentration (ppb) represents the groundwater concentration that might be expected in shallow unconfined aquifers under sandy soils. The outputs located in Appendix B are used for both acute and chronic endpoints. FIRST concentrations (ppb) represent untreated surface water concentrations. The one
- in
- 10
- year peak concentration is used for acute endpoints and the 1
- in
- 10
- ye ar annual average concentration used for chronic endpoints. The estimated concentrations provided in this assessment are conservative estimates of concentrations in8

drinking water. The output files are located in Appendix C. The summary of EDWCs for e ach new use and the existing use on turf is shown below in Table 6 for groundwater using FI RST and Table 7 for surface water using SCIGROW.

. Table 6. Summary of Tier 1 Surface W ater EDWCs based on application of boscalid on turf and proposed new uses on A lfalfa Forage and hay, and Citrus Group 10 run with FIRST . Estimated Drinking Water Concentration (EDWC; ppb) Use Use/rate Modeled (lb a.i./A) Acute Chronic Alfalfa (Pristine) Aerial spray /0.28 x 3 a pplications; annual total of 0.85 38.09 11.25 Alfal fa (Endura) Aerial spray /0.48 x 3 a pplications; annual total of 1.44 65.30 19.29 Citrus Group 10 (Pristine) Aerial spray /0.29 x 4 a pplications; annual total of 1.17 52.58 15.54 Turf (Parent + Unextracted) Ground spray /0.35 x 6 applications; annual total of 2.1 105.3 30.2 Turf (Parent Onl y) Ground spray /0.35 x 6 applications; annual total of 2.1 101.4 26.8 Table 7. Summary of Tier 1 Groundwater EDWCs based on application of boscalid on turf and proposed new uses on Alfalfa Forage and hay, and Citrus Gro up 10 run with SCIGROW. Estimated Drinking Water Concentration (EDWC; ppb) Use Use/rate Modeled (lb a.i./A) Acute and Chronic Alfalfa (Pristine) Aerial spray /0.28 x 3 a pplications; annual total of 0.85 0.61 Alfalfa (Endura) Aerial spray /0.48 x 3 a ppl ications; annual total of 1.44 1.04 Citrus Group 10 (Pristine) Aerial spray /0.29 x 4 a pplications; annual total of 1.17 0.84 Turf (Parent + Unextracted) Ground spray /0.35 x 6 applications; annual total of 2.1 1.51 Turf (Parent Onl y) Ground spray /0.35 x 6 applications; annual total of 2.1 0.59

Conclusions The EDWC s for boscalid in surface water and groundwater were determined to be lower than those estimated for the maximum application rate given b y turf. Risks for the new uses should therefore be le ss than that of those maximum rates already established by

turf. There were a number of uncertainties in the drinking water exposure assessment. These include the application method for the new uses. Itwas assumed that the applications would be aerial, wh ich9

would have a higher percentage of spray drift. The label did not specify which application method is to be used but mentioned both aerial and ground applications. Another assumption that was factored into the assessment is the addition of the unextract ed residues in the calculation of the aerobic soil metabolism half
- lives and its associated input parameters for FIRST and SCI GROW. This value was also used in the determination of aerobic aquatic soil metabolism input parameter. There is also the uncertai nty that comes with the modeling with FI RST and SCI GROW. When using the parent plus unextracted to calculated groundwater and surface water EDWCs the acute EDWC for surface water was l east affected, changing from 101.4 ppb to 105.3 ppb giving a 3. 8 % chang e. The chronic surface water was slightly little more affected than the acute surface water changing from 26.8 ppb with the parent onl y to 30.2 ppb with the parent plus unextracted, which gives a 12. 7 %. The greatest change came from the EDWCs calculated fr om groundwater which went from 0.59 ppb to 1.51 ppb. This is an overall 156 % increase in the EDWC for groundwater. This uncertaint y ma y be resolved with more data or further studies which could include different extraction solvents or additional phy sical c haracterization techniques such as NMR
.10

Appendix A. Aerobic Soil Metabolism Half
- life Calculation
A B C D E F G H 1 Before Calc After re - Calc 2 MRID Half - life MRID Half - life 3 45643802 182 45643802 10 00 4 45643802 578 45643802 1609 5 45643802 408 45643802 848 6 45643802 289 45643802 2553 7 8 9 1 0 Mean 364.25 Mean 1502.5 =AVERAGE(G3:G6 ) 1 1 STDEV 169.784 9 STDEV 773.685 8 =STDEV(G3:G6 ) 1 2 n^0.5 2 n^0.5 2 =4 ^0.5 1 3 t90 1.476 t90 1.476 from input parameter guidance 1 4 1 5 tinput 489.551 3 tinput 2073.48 =G10+((G13*G11)/G12)1112

Appendix A. (Continued) SUMM ARY OUTPUT Illinois Silt Loam Regression Sta tistics Multiple R 0.925907944 R Square 0.85730552 Adjusted R Square 0.83946871 Standard Error 0.037516789 Observations 10 ANOVA df SS MS F Significance F Regression 1 0.067650305 0.0 67650305 48.06383647 0.000120481 Residual 8 0.011260076 0.001407509 Total 9 0.078910381 Coefficients Standard Error t Stat P- value Lower 95% Upper 95% Lower 95.0% Upper 95.0% Intercept 4.571314246 0.016564229 275.9750727 3. 32732E - 17 4.533117066 4.609511 4.533117 4.609511 X Variable 1 - 0.000693253 9.99959E - 05 - 6.9328087 0.000120481 - 0.000923844 - 0.00046 - 0.00092 - 0.0004613

Appendix A. (Continued) SUMM ARY OUTPUT Idaho Clay Loam Regression Statistics Multiple R 0.927848957 R Square 0.860903687 Adjusted R Square 0.843516648 Standard Error 0.022941401 Observations 10 ANOVA df SS MS F Significance F Regression 1 0.026059663 0.026 059663 49.51410533 0.000108603 Residual 8 0.004210463 0.000526308 Total 9 0.030270126 Coefficients Standard Error t Stat P- value Lower 95% Upper 95% Lower 95.0% Upper 95.0% Intercept 4.584678672 0.01012496 452.80955 6.33625 E - 19 4.561330472 4.608027 4.56133 4.608027 X Variable 1 - 0.000430665 6.12033E - 05 - 7.03662599 0.000108603 - 0.0005718 - 0.00029 - 0.00057 - 0.0002914

Appendix A. (Continued) SUMM ARY OUTPUT California Clay Loam Regression Statistics Multiple R 0.964142142 R Square 0.929570069 Adjusted R Square 0.920766328 Standard Error 0.029828543 Observations 10 ANOVA df SS MS F Significance F Regression 1 0.093946142 0.0939 46142 105.5880712 6.92635E - 06 Residual 8 0.007117936 0.000889742 Total 9 0.101064078 Coefficients Standard Error t Stat P- value Lower 95% Upper 95% Lower 95.0% Upper 95.0% Intercept 4.59590763 0.013164533 349.1128622 5.0744 5E - 18 4.565550164 4.626265 4.56555 4.626265 X Variable 1 - 0.000817701 7.95769E - 05 - 10.27560564 6.92635E - 06 - 0.001001206 - 0.00063 - 0.001 - 0.0006315

Appendix A. (Continued) SUMM ARY OUTPUT North Dakota Loam Regression Statistic s Multiple R 0.936554482 R Square 0.877134298 Adjusted R Square 0.861776085 Standard Error 0.013476664 Observations 10 ANOVA df SS MS F Significance F Regression 1 0.010372661 0.01037 2661 57.11174276 6.56337E - 05 Residual 8 0.001452964 0.00018162 Total 9 0.011825625 Coefficients Standard Error t Stat P- value Lower 95% Upper 95% Lower 95.0% Upper 95.0% Intercept 4.590231719 0.00595015 771.4480106 8.92778E - 21 4.576510647 4.603953 4.576511 4.603953 X Variable 1 - 0.000271457 3.59202E - 05 - 7.557231157 6.56337E - 05 - 0.00035429 - 0.00019 - 0.00035 - 0.0001916

Appendix B. SCI GROW Output File s SCI GROW VERSI ON 2.3 ENVIRONMENTAL FATE AND EFFECTS DIVISION O FFI CE OF PESTICIDE PROGRAMS U.S. ENVI RONMENTAL PROTECTION AGENCY

SCREENI

NG MODEL FOR AQUATIC PESTICI DE EXPOSURE SciGrow version 2.3 chemical:Boscalid on Turf (Parent + Unextracted) time is 9/10/2009 10:26:38

------------------------------------------- ----------------------------- Application Number of Total Use Koc Soil Aerobic rate (lb/acre) applications (lb/acre/ yr ) (ml/g) metabolism (day s)

------------------------------------------------------------------------ 0. 350 6.0 2.100 8.21E+02 1503.0

------------------------------------------------------------------------ groundwater screening cond (ppb) = 1.51E+00 ************************************************************************ SciGrow version 2.3 chemical:Boscalid on Turf (Parent Only) time is 9/10/2009 11:22: 1

------------------------------------------------------------------------ Application Number of Total Use Koc Soil Aerobic rate (lb/acre) app lications (lb/acre/ yr ) (ml/g) metabolism (day s)

------------------------------------------------------------------------ 0.350 6.0 2.100 8.21E+02 364.0

------------------------------------------------------------- ----------- groundwater screening cond (ppb) = 5.88E
- 01 ************************************************************************ SciGrow version 2.3 chemical:Boscalid on Alfalfa (Pristine) time is 9/10/2009 10:24:21

--------------------------- --------------------------------------------- Application Number of Total Use Koc Soil Aerobic rate (lb/acre) applications (lb/acre/ yr ) (ml/g) metabolism (day s)

----------------------------------------------------------------- ------- 0.280 3.0 0.840 8.21E+02 1503.0

------------------------------------------------------------------------ groundwater screening cond (ppb) = 6.05E
- 01 ********************************************************** **************17

Appendix B. SCI GROW Output File (continued) SciGrow version 2.3 chemical:Boscalid on Alfalfa (Endura) time is 9/10/2009 10:25:26

------------------------------------------------------------------------ Application Number of Total Use Koc Soil Aerobic rate (lb/acre) applications (lb/acre/ yr ) (ml/g) metabolism (day s)

------------------------------------------------------------------------ 0.480 3.0 1.440 8.21E+02 1503.0

-- ---------------------------------------------------------------------- groundwater screening cond (ppb) = 1.04E+00 ************************************************************************ SciGrow version 2.3 chemical:Boscalid on Ci trus (Group 10) t ime is 9/10/2009 10:26: 3

------------------------------------------------------------------------ Application Number of Total Use Koc Soil Aerobic rate (lb/acre) applications (lb/acre/ yr ) (ml/g) metabolism (day s)

--------- --------------------------------------------------------------- 0.290 4.0 1.160 8.21E+02 1503.0

------------------------------------------------------------------------ groundwater screening cond (ppb) = 8.35E
- 01 ** **********************************************************************18

Appendix C. FI RST Output Files RUN No. 4 FOR Boscalid ON Turf * INPUT VALUES *

------------------------------------------------------- ------------- RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

-------------------------------------------------------------------- .350( 2.076) 6 14 655.0 6.0 GROUND( 6.4) 100.0 .0 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS)

-------------------------------------------------------------------- METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED (FIELD) RAIN/RUN OFF (RESERVOIR) (RES. - EFF) (RESER.) (RESER.)

-------------------------------------------------------------------- 2073.00 2 N/A .00
- .00 ****** 4146.00 UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.1.0 JAN 1, 2007

-------------------------------------------------------------------- PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) CONCENTRATION CONCENTRATION

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

105.338 30.17519

Appendix C. FI RST Output Files (continued)
RUN No. 5 FOR Boscalid ON Turf * INPUT VALUES *

------------------------------- ------------------------------------- RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

-------------------------------------------------------------------- .350( 2.000) 6 14 655.0 6.0 GROUND( 6.4) 100.0 .0 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS)

-------------------------------------------------------------------- METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBIN ED (FIELD) RAIN/RUNOFF (RESERVOIR) (RES.
- EFF) (RESER.) (RESER.)

-------------------------------------------------------------------- 490.00 2 N/A .00
- .00 980.00 980.00 UNTREATED WATER CONC (MICROGRAMS /LITER (PPB)) Ver 1.1.0 JAN 1, 2007

-------------------------------------------------------------------- PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) CONCENTRATION CONCENTRATION

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

101.358 26.754

Appendix C. FI RST Output Files (continued)20

RUN No. 1 FOR Boscalid ON Alfalfa * INPUT VALUES *

------------------ -------------------------------------------------- RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

----------------------------------------------------------- --------- .280( .836) 3 14 655.0 6.0 AERIAL(16.0) 87.0 .0 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS)

-------------------------------------------------------------------- METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS META BOLIC COMBINED (FIELD) RAIN/RUNOFF (RESERVOIR) (RES.
- EFF) (RESER.) (RESER.)

-------------------------------------------------------------------- 2073.00 2 N/A .00
- .00 ****** 4146.00
UNTREATED WATER CON C (MICROGRAMS/LITER (PPB)) Ver 1.1.0 JAN 1, 2007

-------------------------------------------------------------------- PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) CONCENTRATION CONCENTRATION

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

38.089 11.254

Appendix C. FI RST Output Files (continued) RUN No. 2 FOR Boscalid ON Alfalfa * INPUT VALUES *21

-------------------------------------------------------------------- RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

----------------------------------------- --------------------------- .480( 1.433) 3 14 655.0 6.0 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.)

-------------------------------------------------------------------- 2073.00 2 N/A .00
- .00 ****** 4146.00
U NTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.1.0 JAN 1, 2007

-------------------------------------------------------------------- PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) CONCENTRATION CONCENTRATION

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

65.296 19.292

Appendix C. FI RST Output Files (continued)22

RUN No. 3 FOR Boscalid ON Citrus * INPUT VALUES *

-------------------------------------------------------------------- RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP ONE(MULT) INTERVAL Koc (PPM ) (%DRIFT) AREA (IN)

------------------ -------------------------------------------------- .290( 1.154) 4 10 655.0 6.0 AERIAL(16.0) 87.0 .0 FIELD AND RESERVOIR HALFLIFE VALUES (DAYS)

-------------------------------------------------------------------- METABOLIC D AYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED (FIELD) RAIN/RUNOFF (RESERVOIR) (RES.
- EFF) (RESER.) (RESER.)

-------------------------------------------------------------------- 2073.00 2 N/A .00
- .00 ****** 4146.00 UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.1.0 JAN 1, 2007

-------------------------------------------------------------------- PEAK DAY (ACUTE) ANNUAL AVERAGE (CHRONIC) CONCENTRATION CONCENTRATION

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

52.583 15.536