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### INITIAL REVIEW EXPOSURE REPORT (IRExR)
Chemical ID: P-15-0492 Reviewer: Bevington/SD

Results Table: Dose, Concentration, and Days Exceeded Results Summary

Exposure Scenario 1 Water Landfill Stack Air Fugitive Air

Release activity(ies) 2 ; exposure calculation(s) 3 Drinking Water Fish Ingestion 7Q10 4 CC = 1 PDM Days Exceeded LADD ADR LADD ADR LADD ADR LADD ADR LADD
mg/kg/day mg/kg/day mg/kg/day mg/kg/day μ g/l # Days mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day MFG+USE: max acute eco --- --- --- --- 8.30E-01 --- --- --- --- 2.20E-01 ---
MFG+USE: Max LADD --- --- --- --- --- --- --- --- --- --- 2.21E-04

1 Exposure scenario titles consist of release activ ity followed by exposure calculation abbreviation. 2 Release activities are from engineering report's Manufacturing (Mfg), Processing (Proc) and Use release activity labels. Multiple release activities are combined in one exposure scenario if their releases occur at same location. 3 Exposure calculations are Acute Dose Rate (ADR), Life time Average Daily Dose (LADD) , and Probabilistic Dilution Model (PDM). There may be one, two, or all three exposure calculations per exposure scenario. CC is the aquatic concentration of concern. 4 This column displays concentration values for the 7Q10 streamflow, which is defined as the average daily streamflow of the seven consecutive days of lowest flow within a ten year period.
Remarks:6/10/2015 Page 2 of 9

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-15-0492 Assessor: Bevington/SD
ENVIRONMENTAL RELEASES
Scenario#:1 Number of Release Sites: Release Activity: MFG+USE: Max ADR Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases: (kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge Release Days/yr:
Per Site Release: (kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

Remarks:6/10/2015 Page 3 of 9

INITIAL REVIEW EX POSURE REPORT
Chemical ID: P-15-0492

SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 1 Number of Sites: RELEASE ACTIVITY:MFG+USE: Max ADR SIC-CODE DESCRIPTION: SIC-CODE (S): EXPOSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PRETREATMENT RELEASE (kg/site/day) POSTTREATMENT RELEASE (kg/site/day) DWT (%) BCF (L/kg) 0.00 4030.00

AQUATIC EXPOSURE ESTIMATES - SURFACE WATER PLANT TYPE % ILE FACILITY STREAM FLOW (MLD) STREAM CONC. ( μ g/l)

Harmonic

Mean 30Q5 7Q10 1Q10 Harmonic Mean 30Q5 7Q10 1Q10 ALL 50 1.59E-03 4.81E-03 7.10E-03 8.75E-03 ALL 10 8.90E-02 0.48 0.83 0.99

DRINKING WATER AND FISH INGESTION EXPOSURE ESTIMATES

Exposure Units Drinking Water Results Drinking Water Units Fish Ingestion Results Fish Ingestion

Units 50% 10% 50% 10% Cancer
LADD pot 2.64E-10 1.47E-08 mg/kg/day 7.67E-09 4.29E-07 mg/kg/day LADC pot 2.03E-08 1.13E-06 mg/L 8.18E-05 4.57E-03 mg/kg
Acute
ADR pot 1.82E-07 1.82E-05 mg/kg/day 2.24E-05 1.25E-03 mg/kg/day

SIC Code Comments:6/10/2015 Page 4 of 9

INITIAL REVIEW EX POSURE REPORT
Chemical ID: P-15-0492

SIC CODE EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 1 RELEASE ACTIVITY: MFG+USE: Max ADR SIC CODE DESCRIPTION: ASSOCIATED SIC CODES:
SIC CODE RESULTS

COC ( μ g/L) Percent of Year COC Exceeded Number of Days COC Exceeded Release days/year Loading (kg/site/day) Waste Water Treatment (%) High/Avg Analysis

1.00 High6/10/2015 Page 5 of 9

INITIAL REVIEW EX POSURE REPORT Chemical ID: P-15-0492
INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)
SCENARIO #: 1 RELEASE ACTIVITY:MFG+USE: Max ADR RELEASE DESCRIPTION: METHOD OF CALCULATION: Screen3 EXPOSED POPULATION: Adult

Number of Sites: Per Site Fugitive Release: kg/site/day Fugitive Release Days per Year: days % Removal via Fugitive Release: % Total Fugitive Release: kg/yr Max Annual Average Air Concentration (Fugitive): 2.86 μg/m 3

Max 24 Hour Average Air Concentration(Fugitive): 1190.00 μg/m 3

Per Site Stack Release: kg/site/day Stack Release Days per Year: days % Removal via Stack Release: % Total Stack Release: kg/yr Max Annual Average Air Concen tration (Stack): 0.00 μg/m 3 Max 24 Hour Average Air Concentration (Stack): 0.00 μg/m 3

Exposure Units Results (Stack) Results (Fugitive) ASSUMPTIONS
ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr) Cancer LADD pot (mg/kg/day) N/A 2.21E-04 33.00 78.00 80.00 0.61 LADC pot (mg/m 3 ) N/A 1.21E-03 33.00 78.00 NA NA Acute ADR pot

(mg/kg/day) N/A 0.22 NA 1 day 80.00 0.61

Inhalation Comments:6/10/2015 Page 6 of 9

Stack Parameter Data Fugitive Parameter Data Stack Height 10.00 Release Height: 3.00 m
Inside Stack Diameter: 0.10 Length of Release Opening: 10.00 m

Stack Gas Exit Velocity: 0.10 Width of Release Opening: 10.00 m

Stack Gas Temperature: 293.00

Meteorological and Terrain Information:
Surrounding Land Use: Rural Terrain Height: 0.00 m
Distance to Residence of Interest: 100.00 m Meteorological Class: Full Stability Class: NA Wind Speed: NA

Downwash Information:
Facility Length: NA m Facility Width: NA m Facility Height: NA m6/10/2015 Page 7 of 9

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-15-0492 Assessor: Bevington/SD
ENVIRONMENTAL RELEASES
Scenario#:2 Number of Release Sites: Release Activity: MFG+USE: Max LADD Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases: (kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge Release Days/yr:
Per Site Release: (kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

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INITIAL REVIEW EX POSURE REPORT Chemical ID: P-15-0492
INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)
SCENARIO #: 2 RELEASE ACTIVITY:MFG+USE: Max LADD RELEASE DESCRIPTION: METHOD OF CALCULATION: Screen3 EXPOSED POPULATION: Adult

Number of Sites: Per Site Fugitive Release: kg/site/day Fugitive Release Days per Year: days % Removal via Fugitive Release: % Total Fugitive Release: kg/yr Max Annual Average Air Concentration (Fugitive): 2.86 μg/m 3

Max 24 Hour Average Air Concentration(Fugitive): N/A μg/m 3

Per Site Stack Release: kg/site/day Stack Release Days per Year: days % Removal via Stack Release: % Total Stack Release: kg/yr Max Annual Average Air Concen tration (Stack): 0.00 μg/m 3 Max 24 Hour Average Air Concentration (Stack): N/A μg/m 3

Exposure Units Results (Stack) Results (Fugitive) ASSUMPTIONS
ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr) Cancer LADD pot (mg/kg/day) N/A 2.21E-04 33.00 78.00 80.00 0.61 LADC pot (mg/m 3 ) N/A 1.21E-03 33.00 78.00 NA NA Acute ADR pot

(mg/kg/day) N/A N/A NA 1 day 80.00 0.61

Inhalation Comments:6/10/2015 Page 9 of 9

Stack Parameter Data Fugitive Parameter Data Stack Height 10.00 Release Height: 3.00 m
Inside Stack Diameter: 0.10 Length of Release Opening: 10.00 m

Stack Gas Exit Velocity: 0.10 Width of Release Opening: 10.00 m

Stack Gas Temperature: 293.00

Meteorological and Terrain Information:
Surrounding Land Use: Rural Terrain Height: 0.00 m
Distance to Residence of Interest: 100.00 m Meteorological Class: Full Stability Class: NA Wind Speed: NA

Downwash Information:
Facility Length: NA m Facility Width: NA m Facility Height: NA m