10/10/2012 Page 1 of 41



### POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Reviewer: Tobias/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 = 1 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 1: Max ADR: max acute eco 1.49E-02 --- 1 .80E-01 --- --- --- --- 1.95E-04 --- 2.52E-03 ---

PROC 1: PDM1 --- --- --- --- 3.34E+02 --- --- --- --- ---

PROC 1: PDM2 --- --- --- --- 5.75E+01 --- --- --- --- ---

PROC 1: Max LADD --- 2.99E-05 --- 6 .40E-04 --- --- 6.42E-06 --- 2.96E-06 --- 7.04E-06

PROC/USE 2: Max ADR: max acute eco 1.00E-01 --- 1 .25E+00 --- --- --- --- 1.34E-03 --- 2.57E-02 ---

PROC/USE 2: PDM1 --- --- --- --- 1.77E+02 --- --- --- --- ---

PROC/USE 2: Max LADD --- 6.50E-05 --- 1 .39E-03 --- --- 8.76E-05 --- 6.45E-06 --- 6.60E-06

USE 1: Max ADR: max acute eco 5.94E-02 --- 7 .20E-01 --- --- --- --- 7.74E-04 --- 4.52E-04 ---

USE 1: PDM1 --- --- --- --- 1.00E+01 --- --- --- --- ---

USE 1: Max LADD --- 8.30E-06 --- 1 .78E-04 --- --- 2.53E-05 --- 8.24E-07 --- 9.93E-0610/10/2012 Page 2 of 41

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:10/10/2012 Page 3 of 41

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:1 Number of Release Sites: Release Activity: PROC 1: 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:10/10/2012 Page 4 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 1 Number of Site s: RELEASE ACTIVITY:PROC 1: 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 5000.00

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 0.58 1.57 2.51 3.04
ALL 10 20.10 178.41 334.04 334.04

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 3.99E-07 1.37E-05 mg/kg/day 8.56E-06 2.95E-04 mg/kg/day
LADC pot 2.05E-05 7.05E-04 mg/L 0.10 3.52 mg/kg
Acute
ADR pot 1.31E-04 1.49E-02 mg/kg/day 5.25E-03 0.18 mg/kg/day

SIC Code Comments:10/10/2012 Page 5 of 41

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0416
INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)
SCENARIO #: 1 RELEASE ACTIVITY:PROC 1: 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): 9.58E-02 μg/m 3

Max 24 Hour Average Air Concentration(Fugitive): 13.70 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 Concentr ation (Stack): 1.85E-02 μg/m 3 Max 24 Hour Average Air Concentration (Stack): 1.06 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) 1.36E-06 7.04E-06 30.00 75.00 71.80 0.55 LADC pot (mg/m 3 ) 7.40E-06 3.83E-05 30.00 75.00 NA NA Acute ADR pot

(mg/kg/day) 1.95E-04 2.52E-03 NA 1 day 71.80 0.55

Inhalation Comments:10/10/2012 Page 6 of 41

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

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

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 m10/10/2012 Page 7 of 41

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:2 Number of Release Sites: Release Activity: PROC 1: 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:10/10/2012 Page 8 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 2 Number of Site s: RELEASE ACTIVITY:PROC 1: 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 5000.00

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 0.58 1.57 2.51 3.04
ALL 10 20.10 178.41 334.04 334.04

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 3.99E-07 1.37E-05 mg/kg/day 8.56E-06 2.95E-04 mg/kg/day
LADC pot 2.05E-05 7.05E-04 mg/L 0.10 3.52 mg/kg
Acute
ADR pot 1.31E-04 1.49E-02 mg/kg/day 5.25E-03 0.18 mg/kg/day

SIC Code Comments:10/10/2012 Page 9 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416

SIC CODE EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 2 RELEASE ACTIVITY: PROC 1: PDM1
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 High10/10/2012 Page 10 of 41

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:3 Number of Release Sites: Release Activity: PROC 1: PDM2 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:10/10/2012 Page 11 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 3 Number of Site s: RELEASE ACTIVITY:PROC 1: PDM2
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 5000.00

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 0.10 0.27 0.43 0.52
ALL 10 3.46 30.68 57.45 57.45

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 5.36E-07 1.85E-05 mg/kg/day 1.15E-05 3.96E-04 mg/kg/day
LADC pot 2.75E-05 9.47E-04 mg/L 0.14 4.74 mg/kg
Acute
ADR pot 2.26E-05 2.56E-03 mg/kg/day 9.02E-04 3.11E-02 mg/kg/day

SIC Code Comments:10/10/2012 Page 12 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416

SIC CODE EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 3 RELEASE ACTIVITY: PROC 1: PDM2
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 High10/10/2012 Page 13 of 41

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:4 Number of Release Sites: Release Activity: PROC 1: 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:10/10/2012 Page 14 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 4 Number of Site s: RELEASE ACTIVITY:PROC 1: 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 5000.00

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 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 8.67E-07 2.99E-05 mg/kg/day 1.86E-05 6.40E-04 mg/kg/day
LADC pot 4.45E-05 1.53E-03 mg/L 0.22 7.65 mg/kg
Acute
ADR pot N/A N/A mg/kg/day N/A N/A mg/kg/day

SIC Code Comments:10/10/2012 Page 15 of 41

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0416

DRINKING WATER EXPOSURE ESTIMATES FROM LANDFILL RELEASES
SCENARIO #: 4 ACTIVITY: PROC 1: 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) 6.42E-06 30.00 75.00 71.80 1.40 LADC pot (mg/L) 3.29E-04 30.00 75.00 NA NA

REMARKS:10/10/2012 Page 16 of 41

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0416
INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)
SCENARIO #: 4 RELEASE ACTIVITY:PROC 1: 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): 9.58E-02 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 Concentr ation (Stack): 4.03E-02 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) 2.96E-06 7.04E-06 30.00 75.00 71.80 0.55 LADC pot (mg/m 3 ) 1.61E-05 3.83E-05 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:10/10/2012 Page 17 of 41

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

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

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 m10/10/2012 Page 18 of 41

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:5 Number of Release Sites: Release Activity: PROC/USE 2: 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:10/10/2012 Page 19 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 5 Number of Sites: RELEASE ACTIVITY:PROC/USE 2: 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 5000.00

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 4.03 10.85 17.31 21.00
ALL 10 138.67 1230.68 2304.26 2304.26

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 2.58E-07 8.89E-06 mg/kg/day 5.53E-06 1.90E-04 mg/kg/day
LADC pot 1.32E-05 4.56E-04 mg/L 6.62E-02 2.28 mg/kg
Acute
ADR pot 9.07E-04 0.10 mg/kg/day 3.62E-02 1.25 mg/kg/day

SIC Code Comments:10/10/2012 Page 20 of 41

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0416
INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)
SCENARIO #: 5 RELEASE ACTIVITY:PROC/USE 2: 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): 8.98E-02 μg/m 3

Max 24 Hour Average Air Concentration(Fugitive): 140.00 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 Concentr ation (Stack): 1.20E-02 μg/m 3 Max 24 Hour Average Air Concentration (Stack): 7.30 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) 8.82E-07 6.60E-06 30.00 75.00 71.80 0.55 LADC pot (mg/m 3 ) 4.80E-06 3.59E-05 30.00 75.00 NA NA Acute ADR pot

(mg/kg/day) 1.34E-03 2.57E-02 NA 1 day 71.80 0.55

Inhalation Comments:10/10/2012 Page 21 of 41

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

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

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 m10/10/2012 Page 22 of 41

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:6 Number of Release Sites: Release Activity: PROC/USE 2: 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:10/10/2012 Page 23 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 6 Number of Sites: RELEASE ACTIVITY:PROC/USE 2: 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 5000.00

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 0.31 0.83 1.33 1.61
ALL 10 10.63 94.32 176.60 176.60

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 1.65E-06 5.68E-05 mg/kg/day 3.53E-05 1.22E-03 mg/kg/day
LADC pot 8.46E-05 2.91E-03 mg/L 0.42 14.56 mg/kg
Acute
ADR pot 6.95E-05 7.88E-03 mg/kg/day 2.77E-03 9.55E-02 mg/kg/day

SIC Code Comments:10/10/2012 Page 24 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416

SIC CODE EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 6 RELEASE ACTIVITY: PROC/USE 2: PDM1
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 High10/10/2012 Page 25 of 41

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:7 Number of Release Sites: Release Activity: PROC/USE 2: 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:10/10/2012 Page 26 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 7 Number of Sites: RELEASE ACTIVITY:PROC/USE 2: 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 5000.00

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 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 1.89E-06 6.50E-05 mg/kg/day 4.04E-05 1.39E-03 mg/kg/day
LADC pot 9.68E-05 3.33E-03 mg/L 0.48 16.66 mg/kg
Acute
ADR pot N/A N/A mg/kg/day N/A N/A mg/kg/day

SIC Code Comments:10/10/2012 Page 27 of 41

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0416

DRINKING WATER EXPOSURE ESTIMATES FROM LANDFILL RELEASES
SCENARIO #: 7 ACTIVITY: PROC/USE 2: 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) 8.76E-05 30.00 75.00 71.80 1.40 LADC pot (mg/L) 4.49E-03 30.00 75.00 NA NA

REMARKS:10/10/2012 Page 28 of 41

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0416
INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)
SCENARIO #: 7 RELEASE ACTI VITY:PROC/USE 2: 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): 8.98E-02 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 Concentr ation (Stack): 8.77E-02 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) 6.45E-06 6.60E-06 30.00 75.00 71.80 0.55 LADC pot (mg/m 3 ) 3.51E-05 3.59E-05 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:10/10/2012 Page 29 of 41

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

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

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 m10/10/2012 Page 30 of 41

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:8 Number of Release Sites: Release Activity: USE 1: 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:10/10/2012 Page 31 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 8 Number of Site s: RELEASE ACTIVITY:USE 1: 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 5000.00

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 2.32 6.26 9.99 12.12
ALL 10 80.03 710.23 1329.79 1329.79

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 1.49E-07 5.13E-06 mg/kg/day 3.19E-06 1.10E-04 mg/kg/day
LADC pot 7.64E-06 2.63E-04 mg/L 3.82E-02 1.32 mg/kg
Acute
ADR pot 5.23E-04 5.94E-02 mg/kg/day 2.09E-02 0.72 mg/kg/day

SIC Code Comments:10/10/2012 Page 32 of 41

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0416
INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)
SCENARIO #: 8 RELEASE ACTIVITY:USE 1: 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): 0.14 μg/m 3

Max 24 Hour Average Air Concentration(Fugitive): 2.46 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 Concentr ation (Stack): 6.92E-03 μg/m 3 Max 24 Hour Average Air Concentration (Stack): 4.21 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) 5.09E-07 9.93E-06 30.00 75.00 71.80 0.55 LADC pot (mg/m 3 ) 2.77E-06 5.40E-05 30.00 75.00 NA NA Acute ADR pot

(mg/kg/day) 7.74E-04 4.52E-04 NA 1 day 71.80 0.55

Inhalation Comments:10/10/2012 Page 33 of 41

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

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

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 m10/10/2012 Page 34 of 41

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:9 Number of Release Sites: Release Activity: USE 1: 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:10/10/2012 Page 35 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 9 Number of Site s: RELEASE ACTIVITY:USE 1: 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 5000.00

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 1.75E-02 4.71E-02 7.51E-02 9.12E-02
ALL 10 0.60 5.34 10.00 10.00

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 9.34E-08 3.21E-06 mg/kg/day 2.00E-06 6.89E-05 mg/kg/day
LADC pot 4.79E-06 1.65E-04 mg/L 2.39E-02 0.82 mg/kg
Acute
ADR pot 3.94E-06 4.46E-04 mg/kg/day 1.57E-04 5.41E-03 mg/kg/day

SIC Code Comments:10/10/2012 Page 36 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416

SIC CODE EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 9 RELEASE ACTIVITY: USE 1: PDM1
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 High10/10/2012 Page 37 of 41

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0416 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:10 Number of Release Sites: Release Activity: USE 1: 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:10/10/2012 Page 38 of 41

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0416
SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO #: 10 Number of Sites: RELEASE ACTIVITY:USE 1: 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 5000.00

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 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 2.41E-07 8.30E-06 mg/kg/day 5.17E-06 1.78E-04 mg/kg/day
LADC pot 1.24E-05 4.26E-04 mg/L 6.19E-02 2.13 mg/kg
Acute
ADR pot N/A N/A mg/kg/day N/A N/A mg/kg/day

SIC Code Comments:10/10/2012 Page 39 of 41

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0416

DRINKING WATER EXPOSURE ESTIMATES FROM LANDFILL RELEASES
SCENARIO #: 10 ACTIVI TY: USE 1: 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) 2.53E-05 30.00 75.00 71.80 1.40 LADC pot (mg/L) 1.30E-03 30.00 75.00 NA NA

REMARKS:10/10/2012 Page 40 of 41

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0416
INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)
SCENARIO #: 10 RELEASE AC TIVITY:USE 1: 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): 0.14 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 Concentr ation (Stack): 1.12E-02 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) 8.24E-07 9.93E-06 30.00 75.00 71.80 0.55 LADC pot (mg/m 3 ) 4.48E-06 5.40E-05 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:10/10/2012 Page 41 of 41

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

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

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 m