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### INITIAL REVIEW EXPOSURE REPORT (IRExR)
Chemical ID: P-14-0618 Reviewer: Flessner/SS

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 = 23 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+USE: Max ADR: max acute eco 8.37E-04 --- 2.44E-05 --- 1.45E+01 --- --- --- --- 8.27E-02 ---

MFG+USE: PDM1 --- --- --- --- 3.90E-01 --- --- --- --- --- MFG+USE: Max LADD --- 1 .06E-06 --- 1 .44E-08 --- --- 1 .40E-04 --- --- --- ---
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.6/25/14 page of

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-14-0618 Assessor: Flessner/SS
ENVIRONMENTAL RELEASES
Scenario#:1 Number of Release Sites: 1. 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:6/25/14 page of

INITIAL REVIEW EX POSURE REPORT
Chemical ID: P-14-0618 SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO NUMBER:1 RELEASE ACTIVITY: MFG+USE: Max ADR FACILITY NAME: FACILITY LOCATION: RECEIVING WATER NAME: REACH NUMBER: FACILITY ON REACH: DISCHARGE TYPE: NPDES PERMIT #: 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
FLOW DESCRIPTOR Harmonic Mean 30Q5 7Q10 1Q10 PLANT FLOW (MLD) CONCENTRATION ( μ g/L) 4.29 10.02 14.52 17.97 NA

DRINKING WATER INGESTION AND FISH INGESTION EXPOSURE ESTIMATES

Exposure Units Drinking Water Results Drinking Water Units Fish Ingestion Results Fish Ingestion Units
Cancer
LADD pot 9.17E-07 mg/kg/day 1.24E-08 mg/kg/day
LADC pot 4.71E-05 mg/L 1.49E-04 mg/kg
Acute
ADR pot 8.37E-04 mg/kg/day 2.44E-05 mg/kg/day

Surface Water Comments:6/25/14 page of

INITIAL REVIEW EX POSURE REPORT Chemical ID: P-14-0618
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: 1. Per Site Fugitive Release: kg/site/day Fugitive Release Days per Year: days % Removal via Fugitive Release: 0.00 % Total Fugitive Release: kg/yr Max Annual Average Air Concentration (Fugitive): 0.99 μg/m 3

Max 24 Hour Average Air Concentration(Fugitive): 450.00 μg/m 3

Per Site Stack Release: kg/site/day Stack Release Days per Year: days % Removal via Stack Release: 0.00 %
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 7.29E-05 30.00 75.00 71.80 0.55 LADC pot (mg/m 3 ) N/A 3.96E-04 30.00 75.00 NA NA Acute ADR pot

(mg/kg/day) N/A 8.27E-02 NA 1 day 71.80 0.55

Inhalation Comments:6/25/14 page of

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 m6/25/14 page of

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-14-0618 Assessor: Flessner/SS
ENVIRONMENTAL RELEASES
Scenario#:2 Number of Release Sites: 1. Release Activity: MFG+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:6/25/14 page of

INITIAL REVIEW EX POSURE REPORT
Chemical ID: P-14-0618 SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO NUMBER:2 RELEASE ACTIVITY: MFG+USE: PDM1 FACILITY NAME: FACILITY LOCATION: RECEIVING WATER NAME: REACH NUMBER: FACILITY ON REACH: DISCHARGE TYPE: NPDES PERMIT #: 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
FLOW DESCRIPTOR Harmonic Mean 30Q5 7Q10 1Q10 PLANT FLOW (MLD) CONCENTRATION ( μ g/L) 0.11 0.27 0.39 0.48 NA

DRINKING WATER INGESTION AND FISH INGESTION EXPOSURE ESTIMATES

Exposure Units Drinking Water Results Drinking Water Units Fish Ingestion Results Fish Ingestion Units
Cancer
LADD pot 1.72E-07 mg/kg/day 2.33E-09 mg/kg/day
LADC pot 8.82E-06 mg/L 2.79E-05 mg/kg
Acute
ADR pot 2.24E-05 mg/kg/day 6.53E-07 mg/kg/day

Surface Water Comments:6/25/14 page of

INITIAL REVIEW EX POSURE REPORT Chemical ID: P-14-0618
SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO NUMBER: 2 RELEASE ACTIVITY: MFG+USE: PDM1 FACILITY NAME: FACILITY LOCATION: RECEIVING STREAM NAME: REACH NUMBER: FACILITY ON REACH: DISCHARGE TYPE: NPDES PERMIT NUMBER: GAGING STATION ID: GAGING STATION PERIOD OF RECORD: GAGING STATION NUMBER OF OBSERVATIONS: NUMBER OF STATIONS ON REACH:
MEAN FLOW (MLD): 7q10 FLOW (MLD): EFFLUENT FLOW (MLD):

RESULTS

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

23.006/25/14 page of

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P-14-0618 Assessor: Flessner/SS
ENVIRONMENTAL RELEASES
Scenario#:3 Number of Release Sites: 1. 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)

Remarks:6/25/14 page of

INITIAL REVIEW EX POSURE REPORT
Chemical ID: P-14-0618 SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO NUMBER:3 RELEASE ACTIVITY: MFG+USE: Max LADD FACILITY NAME: FACILITY LOCATION: RECEIVING WATER NAME: REACH NUMBER: FACILITY ON REACH: DISCHARGE TYPE: NPDES PERMIT #: 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
FLOW DESCRIPTOR Harmonic Mean 30Q5 7Q10 1Q10 PLANT FLOW (MLD) CONCENTRATION ( μ g/L) N/A N/A N/A N/A NA

DRINKING WATER INGESTION AND FISH INGESTION EXPOSURE ESTIMATES

Exposure Units Drinking Water Results Drinking Water Units Fish Ingestion Results Fish Ingestion Units
Cancer
LADD pot 1.06E-06 mg/kg/day 1.44E-08 mg/kg/day
LADC pot 5.46E-05 mg/L 1.73E-04 mg/kg
Acute
ADR pot N/A mg/kg/day N/A mg/kg/day

Surface Water Comments:6/25/14 page of

INITIAL REVIEW EX POSURE REPORT Chemical ID: P-14-0618

DRINKING WATER EXPOSURE ESTIMATES FROM LANDFILL RELEASES
SCENARIO #: 3 ACTIVITY: MFG+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) 1.40E-04 30.00 75.00 71.80 1.40 LADC pot (mg/L) 7.18E-03 30.00 75.00 NA NA

REMARKS:6/25/14 page of