3/9/2011 Page 1 of 18



### INITIAL REVIEW EXPOSURE REPORT (IRExR) Chemical ID: P-11-0204 Reviewer: Bevington/BC

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 = 7 PDM Days Exceeded 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

PROC: Max ADR: max acute eco 2.47E-02 --- 6.55E-04 --- 5 .02E+02 --- --- --- --- --- ---

PROC: PDM1 --- --- --- --- 1.70E+00 --- --- --- --- ---

PROC: Max LADD --- 9.46E-06 --- 1 .28E-07 --- --- --- --- --- --- ---

USE: Max ADR: max acute eco 6.41E-04 --- 1.70E-05 --- 1 .30E+01 --- --- 5.00E-01 --- --- ---

USE: PDM1 --- --- --- --- 1.30E+01 --- --- --- --- --- USE: Max LADD --- 6.07E-06 --- 8 .22E-08 --- --- 2.43E-04 --- --- --- ---

1 Exposure scenario titles consist of release activity followed by exposure calculation abbreviation. 2 Release activities are from engineering report's Manufact uring (Mfg), Processing (Proc) and Use release activity labels. Multiple release activities are combined in one exposu re scenario if their releases occur at same location. 3 Exposure calculations are Acute Dose Rate (ADR), Lifetime 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:3/9/2011 Page 2 of 18

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-11-0204 Assessor: Bevington/BC
ENVIRONMENTAL RELEASES
Scenario#:1 Number of Release Sites: Release Activity: PROC: 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:3/9/2011 Page 3 of 18

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-11-0204

SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 1 Number of Site s: RELEASE ACTIVITY:PROC: 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 3.16

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 16.52 34.14 53.75 65.40
ALL 10 115.33 295.81 502.20 574.03

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 1.06E-06 7.39E-06 mg/kg/day 1.43E-08 1.00E-07 mg/kg/day
LADC pot 5.43E-05 3.79E-04 mg/L 1.72E-04 1.20E-03 mg/kg
Acute
ADR pot 2.85E-03 2.47E-02 mg/kg/day 9.38E-05 6.55E-04 mg/kg/day

SIC Code Comments:3/9/2011 Page 4 of 18

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-11-0204 Assessor: Bevington/BC
ENVIRONMENTAL RELEASES
Scenario#:2 Number of Release Sites: Release Activity: PROC: 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:3/9/2011 Page 5 of 18

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-11-0204

SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 2 Number of Site s: RELEASE ACTIVITY:PROC: PDM1
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 3.16

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 5.60E-02 0.12 0.18 0.22
ALL 10 0.39 1.00 1.70 1.95

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 2.99E-07 2.09E-06 mg/kg/day 4.05E-09 2.83E-08 mg/kg/day
LADC pot 1.53E-05 1.07E-04 mg/L 4.85E-05 3.38E-04 mg/kg
Acute
ADR pot 9.67E-06 8.38E-05 mg/kg/day 3.18E-07 2.22E-06 mg/kg/day

SIC Code Comments:3/9/2011 Page 6 of 18

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-11-0204

SIC CODE EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 2 RELEASE ACTIVITY: PROC: PDM1
SIC CODE DESCRIPTIO N:
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

310.00 High3/9/2011 Page 7 of 18

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-11-0204 Assessor: Bevington/BC
ENVIRONMENTAL RELEASES
Scenario#:3 Number of Release Sites: Release Activity: PROC: 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:3/9/2011 Page 8 of 18

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-11-0204

SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 3 Number of Site s: RELEASE ACTIVITY:PROC: Max LADD
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 3.16

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 N/A N/A N/A N/A
ALL 10 N/A N/A N/A N/A

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 1.35E-06 9.46E-06 mg/kg/day 1.83E-08 1.28E-07 mg/kg/day
LADC pot 6.95E-05 4.85E-04 mg/L 2.20E-04 1.53E-03 mg/kg
Acute
ADR pot N/A N/A mg/kg/day N/A N/A mg/kg/day

SIC Code Comments:3/9/2011 Page 9 of 18

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-11-0204 Assessor: Bevington/BC
ENVIRONMENTAL RELEASES
Scenario#:4 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:3/9/2011 Page 10 of 18

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-11-0204

SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 4 Number of Site s: RELEASE ACTIVITY: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 3.16

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 0.43 0.88 1.39 1.69
ALL 10 2.99 7.67 13.01 14.87

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 8.69E-07 6.07E-06 mg/kg/day 1.18E-08 8.22E-08 mg/kg/day
LADC pot 4.46E-05 3.11E-04 mg/L 1.41E-04 9.83E-04 mg/kg
Acute
ADR pot 7.39E-05 6.41E-04 mg/kg/day 2.43E-06 1.70E-05 mg/kg/day

SIC Code Comments:3/9/2011 Page 11 of 18

INITIAL REVIEW EX POSURE REPORT Chemical ID: P-11-0204

INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)

SCENARIO #: 4 RELEASE ACTIVITY: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): 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 Concen tration (Stack): 1.48 μg/m 3 Max 24 Hour Average Air Concentration (Stack): 2700.00 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) 1.09E-04 N/A 30.00 75.00 71.80 0.55
LADC pot (mg/m 3 ) 5.92E-04 N/A 30.00 75.00 NA NA
Acute
ADR pot

(mg/kg/day) 0.50 N/A NA 1 day 71.80 0.55

Inhalation Comments:3/9/2011 Page 12 of 18

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 m3/9/2011 Page 13 of 18

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-11-0204 Assessor: Bevington/BC
ENVIRONMENTAL RELEASES
Scenario#:5 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:3/9/2011 Page 14 of 18

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-11-0204

SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 5 Number of S ites: RELEASE ACTIVITY:USE: PDM1
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 3.16

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 0.43 0.88 1.39 1.69
ALL 10 2.99 7.67 13.01 14.87

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 8.69E-07 6.07E-06 mg/kg/day 1.18E-08 8.22E-08 mg/kg/day
LADC pot 4.46E-05 3.11E-04 mg/L 1.41E-04 9.83E-04 mg/kg
Acute
ADR pot 7.39E-05 6.41E-04 mg/kg/day 2.43E-06 1.70E-05 mg/kg/day

SIC Code Comments:3/9/2011 Page 15 of 18

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-11-0204

SIC CODE EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 5 RELEASE ACTIVITY: USE: PDM1
SIC CODE DESCRIPTIO N:
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

310.00 High3/9/2011 Page 16 of 18

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-11-0204 Assessor: Bevington/BC
ENVIRONMENTAL RELEASES
Scenario#:6 Number of Release Sites: Release Activity: 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)

Remarks:3/9/2011 Page 17 of 18

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-11-0204

SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 6 Number of Site s: RELEASE ACTIVITY:USE: Max LADD
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 3.16

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 N/A N/A N/A N/A
ALL 10 N/A N/A N/A N/A

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 8.69E-07 6.07E-06 mg/kg/day 1.18E-08 8.22E-08 mg/kg/day
LADC pot 4.46E-05 3.11E-04 mg/L 1.41E-04 9.83E-04 mg/kg
Acute
ADR pot N/A N/A mg/kg/day N/A N/A mg/kg/day

SIC Code Comments:3/9/2011 Page 18 of 18

INITIAL REVIEW EX POSURE REPORT Chemical ID: P-11-0204

DRINKING WATER EXPOSURE ESTIMATES FROM LANDFILL RELEASES

SCENARIO #: 6 ACTIVITY: USE: Max LADD
RELEASE DESCRIPTION:
EXPOSED POPULATION: Adult

NUMBER OF SITES NON-SLUDGE LANDFILL RELEASE AND DAYS OF RELEASE (kg/site/day)/(days) LANDFILLED SLUDGE 1 AND DAYS OF RELEASE (kg/site/day)/(days) MIGRATION DESCRIPTOR 2 ADSORPTION TO WASTEWATER SLUDGE (%) DRINKING WATER TREATMENT (%)

0.00 0.00

1 Landfilled sludge equals the fraction adsorbed to wastewater treatment sludge times the surface water pre-treatment release.

2 Migration Descriptor Log Koc Groundwater Concentration (GWC) (mg/L per kg release) Negligible no migration None Negligible to slow > 4.5 3.21E-6 Slow <4.5 to 3.5 2.67E-5 Moderate <3.5 to 2.5 5.95E-5 Rapid <2.5 7.55E-5

Exposure Units Results ASSUMPTIONS ED (years) AT (years) BW (kg) IR (L/day) Cancer LADD pot (mg/kg/day) 2.43E-04 30.00 75.00 71.80 1.40 LADC pot (mg/L) 1.25E-02 30.00 75.00 NA NA

REMARKS: