AgDrift Chlorpyrifos Analysis

Aerial Application (Concentration at 5 foot breathing height) Tier 2 Agdrift V 2.01 Used With All Defaults Except Active and Non-volatile Rates Based On DAS Error Correction Comments/Meeting:
Active (lb ai/a): 6Non Vol. Rate (lb ai/a): 9 Active (lb ai/a): 4Non Vol. Rate (lb ai/a): 6 Active (lb ai/a): 2.3Non Vol. Rate (lb ai/a): 3.45 Active (lb ai/a): 2Non Vol. Rate (lb ai/a): 3 Active (lb ai/a): 1Non Vol. Rate (lb ai/a): 1.5 All scenarions based on 2 gallon per acre spray volume
6 lb ai/ A - Nursery and Orchard Trees (except apple), Tree Fruit, Tree Nuts

Flux Plane Distance (ft)ng/L (ppt)ng/m3 Flux Plane Distance (ft) ng/L (ppt) ng/m3 0 75 75000 0 5555000 10 62.5 62500 10 42.542500 25 51 51000 25 32.532500 50 42 42000 50 2525000 75 32 32000 75 1818000 100 26 26000 100 1515000 125 22 22000 125 12.512500
4 lb ai/ A - Nursery and Orchard Trees (except apple), Tree Fruit, Tree Nuts

Flux Plane Distance (ft)ng/L (ppt)ng/m3 Flux Plane Distance (ft) ng/L (ppt) ng/m3 0 52.5 52500 0 37.537500 10 44 44000 10 29.529500 25 37 37000 25 2323000 50 30 30000 50 1818000 75 23 23000 75 1414000 100 20 20000 100 1212000 125 17 17000 125 9.5 9500
2.3 lb ai/ A - Citrus Greening

Flux Plane Distance (ft)ng/L (ppt)ng/m3 Flux Plane Distance (ft) ng/L (ppt) ng/m3 0 33 33000 0 2323000 10 27 27000 10 1818000 25 23 23000 25 1414000 50 19 19000 50 1212000 75 16 16000 75 9 9000 100 13 13000 100 88000 125 12 12000 125 7 7000 Coarse to Very Coarse Droplet Medium to Coarse Droplet Size Medium to Coarse Droplet Size Coarse to Very Coarse Droplet

Medium to Coarse Droplet Size Coarse to Very Coarse Droplet2 lb ai/ A - Nursery and Orchard Trees (except apple), Tree Fruit, Tree Nuts

Flux Plane Distance (ft)ng/L (ppt)ng/m3 Flux Plane Distance (ft) ng/L (ppt) ng/m3 0 29 29000 0 2020000 10 24 24000 10 1616000 25 21 21000 25 1313000 50 18 18000 50 1111000 75 14 14000 75 88000 100 13 13000 100 7 7000 125 11 11000 125 6 6000

1 lb ai/ A - Alfalfa, Asparagus, Sorghum, Strawberry, Sugarbeet

Flux Plane Distance (ft)ng/L (ppt)ng/m3 Flux Plane Distance (ft) ng/L (ppt) ng/m3 0 16 16000 0 1111000 10 13 13000 10 88000 25 12 12000 25 88000 50 10 10000 50 6 6000 75 9 9000 75 5 5000 100 8 8000 100 44000 125 7 7000 125 3 3000 Coarse to Very Coarse Droplet Medium to Coarse Droplet Size

Medium to Coarse Droplet Size Coarse to Very Coarse DropletTier 2 Agdrift V 2.01 Used With All Defaults Except Active and Non-volatile Rates Based On DAS Error Correction Comments/Meeting:AgDrift Chlorpyrifos Analysis

Acute HEC 2480000LOC = 300 Aerial Application (Concentration at 5 foot breathing height) Flux plane air concentrations represent 1 hour TWA values Amortization accounts for anticipated dissipation over time and lack of active exposure source Dissipation rate (fraction retained per hour): 0.25 Concentrations based on Agdrift Tier 2 and DAS Error Correction Comments

Medium/Coarse Droplets Coarse/Very Coarse DropletsMedium/Coarse Droplets Coarse/Very Coarse Droplets ng/m3 ng/m3 ng/m3 MOE ng/m3 MOE

0 75000 55000 46875 53 34375 72 10 62500 42500 39063 63 26563 93 25 51000 32500 31875 78 20313 122 50 42000 25000 26250 94 15625 159 75 32000 18000 20000 124 11250 220 100 26000 15000 16250 153 9375 265 125 22000 12500 13750 180 7813 317

0 52500 37500 32813 76 23438 106 10 44000 29500 27500 90 18438 135 25 37000 23000 23125 107 14375 173 50 30000 18000 18750 132 11250 220 75 23000 14000 14375 173 8750 283 100 20000 12000 12500 198 7500 331 125 17000 9500 10625 233 5938 418

0 33000 23000 20625 120 14375 173 10 27000 18000 16875 147 11250 220 25 23000 14000 14375 173 8750 283 50 19000 12000 11875 209 7500 331 75 16000 9000 10000 248 5625 441 100 13000 8000 8125 305 5000 496 125 12000 7000 7500 331 4375 567

0 29000 20000 18125 137 12500 198 10 24000 16000 15000 165 10000 248 25 21000 13000 13125 189 8125 305 50 18000 11000 11250 220 6875 361 75 14000 8000 8750 283 5000 496 100 13000 7000 8125 305 4375 567 125 11000 6000 6875 361 3750 661

0 16000 11000 10000 248 6875 361 10 13000 8000 8125 305 5000 496 25 12000 8000 7500 331 5000 496 50 10000 6000 6250 397 3750 661 75 9000 5000 5625 441 3125 794 100 8000 4000 5000 496 2500 992 125 7000 3000 4375 567 1875 1323 1 lb ai/ A Flux Plane Distance (ft) 1 Hr Concentrations From AgDrift Results Based On 2 Hr Amortized Concentration

2.3 lb ai/ A - Citrus (Greening)

2 lb ai/ A 6 lb ai/ A

4 lb ai/ A