5/31/2013 Page 1 of 8



### POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0572 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 =

11 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

Max ADR: max acut e eco 7.66E-07 --- 1.97E-08 --- 1.25E02 --- --- --- --- --- ---

PDM1 --- --- --- --- 1.25E02 --- --- --- --- ---

Max LADD --- 1 .63E-09 --- 2.21E-11 --- --- --- --- --- --- ---

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:5/31/2013 Page 2 of 8

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0572 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:1 Number of Release Sites: Release Activity: 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)

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POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0572 SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO NUMBER:1 RELEASE ACTIVITY: 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) 3.48E-03 9.16E-03 1.25E-02 1.56E-02 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 1.63E-09 mg/kg/day 2.21E-11 mg/kg/day
LADC pot 8.38E-08 mg/L 2.65E-07 mg/kg
Acute
ADR pot 7.66E-07 mg/kg/day 1.97E-08 mg/kg/day

Surface Water Comments:5/31/2013 Page 4 of 8

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0572 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:2 Number of Release Sites: Release Activity: 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:5/31/2013 Page 5 of 8

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0572 SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO NUMBER:2 RELEASE ACTIVITY: 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) 3.48E-03 9.16E-03 1.25E-02 1.56E-02 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 1.63E-09 mg/kg/day 2.21E-11 mg/kg/day
LADC pot 8.38E-08 mg/L 2.65E-07 mg/kg
Acute
ADR pot 7.66E-07 mg/kg/day 1.97E-08 mg/kg/day

Surface Water Comments:5/31/2013 Page 6 of 8

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0572
SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO NUMBER: 2 RELEASE ACTIVITY: 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 (%)

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POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0572 Assessor: Tobias/BC
ENVIRONMENTAL RELEASES
Scenario#:3 Number of Release Sites: Release Activity: 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:5/31/2013 Page 8 of 8

POST FOCUS EXPOSURE REPORT
Chemical ID: P-12-0572 SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES
SCENARIO NUMBER:3 RELEASE ACTIVITY: 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 1.63E-09 mg/kg/day 2.21E-11 mg/kg/day
LADC pot 8.38E-08 mg/L 2.65E-07 mg/kg
Acute
ADR pot N/A mg/kg/day N/A mg/kg/day

Surface Water Comments: