3/20/13 page of



### POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0576 Reviewer: Wong/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 = PDM Days Exceede d LADD ADR LADD ADR LADD

Release activity(ies) 2 ; exposure calculation(s) 3 mg/kg/day m g/kg/day mg/kg/day mg/kg/day μg/l # Days mg/kg/day m g/kg/day mg/kg/day m g/kg/day mg/kg/day

Max LADD --- --- --- --- --- --- 1.91E-03 --- --- --- ---

Max LADD --- --- --- --- --- --- 2.16E-03 --- --- --- --- Max LADD* --- --- --- --- --- --- 4.07E-03 --- --- --- ---

1 Exposure scenario titles consist of release activ ity followed by exposure calculation abbreviation. 2 Release activities are from engineering repor t's Manufacturing (Mfg), Processing (Proc) and Use release activity labels.Multipl e release activities are combined in one exposure scenar io 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 e xposure 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 s even consecutive days of lowest flow within a ten year period.

Remarks:



### Results Table: Exposure Based (X B)/Persistent (P2B2) Criteria

Parameter Exp Based Persistent Exceedance Value Drinking (Surface) Wate r Dose (mg/kg/day) No No Fish Ingestion Dose (mg/kg/day) No No Inhalation Dose (mg/kg/day) No No Groundwater Dose (mg/kg/day) Yes Yes 4.07E-03 Surface Water Release After Treatment (kg/yr) No No Total Release After Treatment (kg/yr) Consumer Use? No



### Fate test recommendations?: (default is NA)3/20/13 page of

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0576 Assessor: Wong/SS

ENVIRONMENTAL RELEASES

Scenario#:1 Number of Release Sites: Release Activity: Max LADD
Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases:
(k g/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:3/20/13 page of

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0576

DRINKING WATER EXPOSURE ESTIMATES FROM LANDFILL RELEASES

SCENARIO #: 1 ACTIVITY: 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) Negl igible 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) 1.91E-03 30.00 75.00 71.80 1.40
LADC pot (mg/L) 9.80E-02 30.00 75.00 NA NA

REMARKS:3/20/13 page of

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0576 Assessor: Wong/SS

ENVIRONMENTAL RELEASES

Scenario#:2 Number of Release Sites: Release Activity: Max LADD
Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases:
(k g/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:3/20/13 page of

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0576

DRINKING WATER EXPOSURE ESTIMATES FROM LANDFILL RELEASES

SCENARIO #: 2 ACTIVITY: 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) Negl igible 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) 2.16E-03 30.00 75.00 71.80 1.40
LADC pot (mg/L) 0.11 30.00 75.00 NA NA

REMARKS:3/20/13 page of

POST FOCUS EXPOSURE REPORT

Chemical ID: P-12-0576 Assessor: Wong/SS

ENVIRONMENTAL RELEASES

Scenario#:3 Number of Release Sites: Release Activity: : Max LADD
Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases:
(k g/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:3/20/13 page of

POST FOCUS EXPOSURE REPORT Chemical ID: P-12-0576

DRINKING WATER EXPOSURE ESTIMATES FROM LANDFILL RELEASES

SCENARIO #: 3 ACTIVITY: 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) Negl igible 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) 4.07E-03 30.00 75.00 71.80 1.40
LADC pot (mg/L) 0.21 30.00 75.00 NA NA

REMARKS: