2/6/2013 Page 1 of 12



### INITIAL REVIEW EXPOSURE REPORT (IRExR)

Chemical ID: P-13-0225 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 = 3 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/USE: Max ADR:
max acute eco 1.42E-03 --- 3.24E-05 --- 2.91E+01 --- --- --- --- --- ---

PROC/USE: PDM1 --- --- --- --- 2.91E+01 --- --- --- --- ---

PROC/USE: PDM2 --- --- --- --- 4.64E+00 --- --- --- --- ---

PROC/USE: Max LADD --- 1.36E-05 --- 1.84E-07 --- --- 5.25E-05 --- --- --- ---

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:2/6/2013 Page 2 of 12

INITIA L REV IEW EXPOSURE REPORT

Chemical ID: P-13-0225 Assessor: Flessner/BC

ENVIRONMENTAL RELEASES

Scenario#:1 Number of Release Sites: Release Activity: PROC/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:2/6/2013 Page 3 of 12

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-13-0225

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

SCENARIO #: 1 Number of Sites: RELEASE ACTIVITY:PROC/USE: 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 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 50 288.00 123.84 78.18 66.05 0.78 1.82 2.89 3.42

ALL 10 39.60 13.29 7.76 7.57 5.71 17.01 29.12 29.85

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 1.34E-06 9.76E-06 mg/kg/day 1.82E-08 1.32E-07 mg/kg/day

LADC pot 6.88E-05 5.00E-04 mg/L 2.17E-04 1.58E-03 mg/kg

Acute

ADR pot 1.53E-04 1.42E-03 mg/kg/day 4.46E-06 3.24E-05 mg/kg/day

SIC Code Comments:2/6/2013 Page 4 of 12

INITIA L REV IEW EXPOSURE REPORT

Chemical ID: P-13-0225 Assessor: Flessner/BC

ENVIRONMENTAL RELEASES

Scenario#:2 Number of Release Sites: Release Activity: PROC/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:2/6/2013 Page 5 of 12

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-13-0225

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

SCENARIO #: 2 Number of Sites: RELEASE ACTIVITY:PROC/USE: PDM1
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 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 50 288.00 123.84 78.18 66.05 0.78 1.82 2.89 3.42

ALL 10 39.60 13.29 7.76 7.57 5.71 17.01 29.12 29.85

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 1.34E-06 9.76E-06 mg/kg/day 1.82E-08 1.32E-07 mg/kg/day

LADC pot 6.88E-05 5.00E-04 mg/L 2.17E-04 1.58E-03 mg/kg

Acute

ADR pot 1.53E-04 1.42E-03 mg/kg/day 4.46E-06 3.24E-05 mg/kg/day

SIC Code Comments:2/6/2013 Page 6 of 12

INITI A L REVIEW EX POSURE REPORT

Chemical ID: P-13-0225

SIC CODE EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 2 RELEASE ACTIVITY: PROC/USE: PDM1
SIC CODE DESCRIPTION: POTW (Indust., includes POTWs which receive ind. disch.)

ASSOCIATED SIC CODES: Subset of 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

3.00 High2/6/2013 Page 7 of 12

INITIA L REV IEW EXPOSURE REPORT

Chemical ID: P-13-0225 Assessor: Flessner/BC

ENVIRONMENTAL RELEASES

Scenario#:3 Number of Release Sites: Release Activity: PROC/USE: 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:2/6/2013 Page 8 of 12

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-13-0225

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

SCENARIO #: 3 Number of Sites: RELEASE ACTIVITY:PROC/USE: PDM2
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 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 50 288.00 123.84 78.18 66.05 0.12 0.29 0.46 0.55

ALL 10 39.60 13.29 7.76 7.57 0.91 2.71 4.64 4.76

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 7.43E-07 5.40E-06 mg/kg/day 1.01E-08 7.31E-08 mg/kg/day

LADC pot 3.81E-05 2.77E-04 mg/L 1.20E-04 8.75E-04 mg/kg

Acute

ADR pot 2.43E-05 2.26E-04 mg/kg/day 7.10E-07 5.16E-06 mg/kg/day

SIC Code Comments:2/6/2013 Page 9 of 12

INITI A L REVIEW EX POSURE REPORT

Chemical ID: P-13-0225

SIC CODE EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 3 RELEASE ACTIVITY: PROC/USE: PDM2
SIC CODE DESCRIPTION: POTW (Indust., includes POTWs which receive ind. disch.)

ASSOCIATED SIC CODES: Subset of 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

3.00 High2/6/2013 Page 10 of 12

INITIA L REV IEW EXPOSURE REPORT

Chemical ID: P-13-0225 Assessor: Flessner/BC

ENVIRONMENTAL RELEASES

Scenario#:4 Number of Release Sites: Release Activity: PROC/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:2/6/2013 Page 11 of 12

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-13-0225

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

SCENARIO #: 4 Number of Sites: RELEASE ACTIVITY:PROC/USE: Max LADD
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 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 50 288.00 123.84 78.18 66.05 N/A N/A N/A N/A

ALL 10 39.60 13.29 7.76 7.57 N/A N/A N/A N/A

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 1.87E-06 1.36E-05 mg/kg/day 2.53E-08 1.84E-07 mg/kg/day

LADC pot 9.59E-05 6.98E-04 mg/L 3.03E-04 2.20E-03 mg/kg

Acute

ADR pot N/A N/A mg/kg/day N/A N/A mg/kg/day

SIC Code Comments:2/6/2013 Page 12 of 12

INITI A L REVIEW EX POSURE REPORT Chemical ID: P-13-0225

DRINKING WATER EXPOSURE ESTIMATES FROM LANDFILL RELEASES

SCENARIO #: 4 ACTIVITY: PROC/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

ASSUMPTIONS Exposure Units Results ED (years) AT (years) BW (kg) IR (L/day)
Cancer
LADD pot (mg/kg/day) 5.25E-05 30.00 75.00 71.80 1.40
LADC pot (mg/L) 2.69E-03 30.00 75.00 NA NA

REMARKS: