12/28/12 Page 1 of 13



### INITIAL REVIEW EXPOSURE REPORT (IRExR)
Chemical ID: P-13-0168 Reviewer: Kwon/AG

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

Exposure Scenario 1 Water Landfill Stack Air Fugitive Air
Drinking Water Fish Ingestion ADR LADD ADR LADD 7Q10 4 CC = 1 PDM Days Exceede d LADD ADR LADD ADR LADD

Release activity(ies) 2 ; exposure calculation(s) 3 mg/kg/day mg/kg/day mg/kg/day mg/kg/day μg/l # Days mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day

MFG: max acute eco --- --- --- --- 2.58E+03 --- --- 2.50E-01 --- --- ---

MFG: Max LADD --- --- --- --- --- --- --- --- 2.71E-04 --- ---

USE: max acute eco --- --- --- --- 3.77E+02 --- --- --- --- --- ---

USE: PDM1 --- --- --- --- 3.77E+02 --- --- --- --- ---

1 Exposure scenario titles consist of release activity followed by exposure calculation abbreviation. 2 Release activities are from engineering report's Manuf acturing (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 (A DR), Lifetime Average Daily Dose (LADD), and Probabilistic Dilution Model (PDM). Th ere 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 7Q 10 streamflow, which is defined as the average daily streamflow of the seven consecutive days of lowest flow within a ten year period.
Remarks:12/28/12 Page 2 of 13

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-13-0168 Assessor: Kwon/AG
ENVIRONMENTAL RELEASES
Scenario#:1 Number of Release Sites: Release Activity: MFG: 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:12/28/12 Page 3 of 13

INITIAL REVIEW EX POSURE REPORT
Chemical ID: P-13-0168
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 1 Number of S ites: RELEASE ACTIVITY:MFG: Max ADR SIC-CODE DESCRIPTION: POTW (Indust., incl udes POTWs which receive ind. disch.) SIC-CODE (S): Subset of 49 52 EXPOSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PRETREATMENT RELEASE (kg/site/day) POSTTREATMENT RELEASE (kg/site/day) DWT (%) BCF (L/kg) 0.00 2170.00

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 50 288.00 123.84 78.18 66.05 69.44 161.50 255.82 302.80
ALL 10 39.60 13.29 7.76 7.57 505.05 1504.89 2577.32 2642.01

DRINKING WATER AND FISH IN GESTION EXPOSURE ESTIMATES

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

Units 50% 10% 50% 10% Cancer
LADD pot 7.42E-06 5.40E-05 mg/kg/day 6.90E-05 5.02E-04 mg/kg/day
LADC pot 3.81E-04 2.77E-03 mg/L 0.83 6.01 mg/kg
Acute
ADR pot 1.35E-02 0.13 mg/kg/day 0.27 1.97 mg/kg/day

SIC Code Comments:12/28/12 Page 4 of 13

INITIAL REVIEW EX POSURE REPORT Chemical ID: P-13-0168
INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)
SCENARIO #: 1 RELEASE ACTIVITY:MFG: 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): 0.00 μg/m 3

Max 24 Hour Average Air Concentration(Fugitive): 0.00 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 Con centration (Stack): 3.69 μg/m 3 Max 24 Hour Average Air Concentration (Stack): 1350.00 μg/m 3

ASSUMPTIONS Exposure Units Results (Stack) Results (Fugitive) ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr) Cancer LADD pot (mg/kg/day) 2.71E-04 N/A 30.00 75.00 71.80 0.55 LADC pot (mg/m 3 ) 1.48E-03 N/A 30.00 75.00 NA NA Acute ADR pot

(mg/kg/day) 0.25 N/A NA 1 day 71.80 0.55

Inhalation Comments:12/28/12 Page 5 of 13

Stack Parameter Data Fugitive Parameter Data Stack Height 10.00 m Release Height: N/A
Inside Stack Diameter: 0.10 m Length of Release Opening: N/A

Stack Gas Exit Velocity: 0.10 m/sec Width of Release Opening: N/A

Stack Gas Temperature: 293.00 K

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 m12/28/12 Page 6 of 13

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-13-0168 Assessor: Kwon/AG
ENVIRONMENTAL RELEASES
Scenario#:2 Number of Release Sites: Release Activity: MFG: 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)

Remarks:12/28/12 Page 7 of 13

INITIAL REVIEW EX POSURE REPORT Chemical ID: P-13-0168
INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)
SCENARIO #: 2 RELEASE ACTIVITY:MFG: 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): 0.00 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 Con centration (Stack): 3.69 μg/m 3 Max 24 Hour Average Air Concentration (Stack): N/A μg/m 3

ASSUMPTIONS Exposure Units Results (Stack) Results (Fugitive) ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr) Cancer LADD pot (mg/kg/day) 2.71E-04 N/A 30.00 75.00 71.80 0.55 LADC pot (mg/m 3 ) 1.48E-03 N/A 30.00 75.00 NA NA Acute ADR pot

(mg/kg/day) N/A N/A NA 1 day 71.80 0.55

Inhalation Comments:12/28/12 Page 8 of 13

Stack Parameter Data Fugitive Parameter Data Stack Height 10.00 m Release Height: N/A
Inside Stack Diameter: 0.10 m Length of Release Opening: N/A

Stack Gas Exit Velocity: 0.10 m/sec Width of Release Opening: N/A

Stack Gas Temperature: 293.00 K

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 m12/28/12 Page 9 of 13

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-13-0168 Assessor: Kwon/AG
ENVIRONMENTAL RELEASES
Scenario#:3 Number of Release Sites: Release Activity: 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:12/28/12 Page 10 of 13

INITIAL REVIEW EX POSURE REPORT
Chemical ID: P-13-0168
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 3 Number of Site s: RELEASE ACTIVITY:USE: Max ADR SIC-CODE DESCRIPTION: POTW's (All facilities) SIC-CODE (S): 4952 EX POSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PRETREATMENT RELEASE (kg/site/day) POSTTREATMENT RELEASE (kg/site/day) DWT (%) BCF (L/kg) 0.00 2170.00

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 50 125.56 44.02 26.80 22.53 3.19 9.09 14.93 17.75
ALL 10 11.11 1.94 1.06 0.96 36.00 206.19 377.36 416.67

DRINKING WATER AND FISH IN GESTION EXPOSURE ESTIMATES

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

Units 50% 10% 50% 10% Cancer
LADD pot 1.70E-06 1.92E-05 mg/kg/day 1.58E-05 1.79E-04 mg/kg/day
LADC pot 8.73E-05 9.86E-04 mg/L 0.19 2.14 mg/kg
Acute
ADR pot 7.59E-04 1.72E-02 mg/kg/day 1.24E-02 0.14 mg/kg/day

SIC Code Comments:12/28/12 Page 11 of 13

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-13-0168 Assessor: Kwon/AG
ENVIRONMENTAL RELEASES
Scenario#:4 Number of Release Sites: Release Activity: USE: PDM1 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:12/28/12 Page 12 of 13

INITIAL REVIEW EX POSURE REPORT
Chemical ID: P-13-0168
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 4 Number of S ites: RELEASE ACTIVITY:USE: PDM1 SIC-CODE DESCRIPTION: POTW's (All facilities) SIC-CODE (S): 4952 EX POSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PRETREATMENT RELEASE (kg/site/day) POSTTREATMENT RELEASE (kg/site/day) DWT (%) BCF (L/kg) 0.00 2170.00

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 50 125.56 44.02 26.80 22.53 3.19 9.09 14.93 17.75
ALL 10 11.11 1.94 1.06 0.96 36.00 206.19 377.36 416.67

DRINKING WATER AND FISH IN GESTION EXPOSURE ESTIMATES

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

Units 50% 10% 50% 10% Cancer
LADD pot 1.70E-06 1.92E-05 mg/kg/day 1.58E-05 1.79E-04 mg/kg/day
LADC pot 8.73E-05 9.86E-04 mg/L 0.19 2.14 mg/kg
Acute
ADR pot 7.59E-04 1.72E-02 mg/kg/day 1.24E-02 0.14 mg/kg/day

SIC Code Comments:12/28/12 Page 13 of 13

INITIAL REVIEW EX POSURE REPORT
Chemical ID: P-13-0168

SIC CODE EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 4 RELEASE ACTIVITY: USE: PDM1 SIC CODE DESCRI PTION: POTW's (All facilities)
ASSOCIATED SIC CODES: 4952
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 High