8/8/2012 Page 1 of 6



### INITIAL REVIEW EXPOSURE REPORT (IRExR)

Chemical ID: P-12-0464 Reviewer: Cinalli/SD

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 = 8 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

Use: max
acute eco --- --- --- --- 6.92E+00 --- --- --- --- --- ---

Use: PDM1 --- --- --- --- 4.00E+00 --- --- --- --- ---

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 th ree 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:8/8/2012 Page 2 of 6

INITIA L REV IEW EXPOSURE REPORT

Chemical ID: P-12-0464 Assessor: Bevington/AG

ENVIRONMENTAL RELEASES

Scenario#:1 Number of Release Sites: Release Activity: 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:8/8/2012 Page 3 of 6

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-12-0464

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

SCENARIO #: 1 Number of Site s: RELEASE ACTIVITY:Use: 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 0.00

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 0.12 0.31 0.46 0.56

ALL 10 2.17 4.29 6.92 7.77

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 4.51E-08 7.89E-07 mg/kg/day 0.00 0.00 mg/kg/day

LADC pot 2.32E-06 4.05E-05 mg/L 0.00 0.00 mg/kg

Acute

ADR pot 2.60E-05 3.59E-04 mg/kg/day 0.00 0.00 mg/kg/day

SIC Code Comments:8/8/2012 Page 4 of 6

INITIA L REV IEW EXPOSURE REPORT

Chemical ID: P-12-0464 Assessor: Bevington/AG

ENVIRONMENTAL RELEASES

Scenario#:2 Number of Release Sites: Release Activity: 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:8/8/2012 Page 5 of 6

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-12-0464

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

SCENARIO #: 2 Number of S ites: RELEASE ACTIVITY:Use: 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 0.00

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 7.19E-02 0.18 0.26 0.33

ALL 10 1.26 2.48 4.00 4.49

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 3.84E-07 6.71E-06 mg/kg/day 0.00 0.00 mg/kg/day

LADC pot 1.97E-05 3.44E-04 mg/L 0.00 0.00 mg/kg

Acute

ADR pot 1.51E-05 2.08E-04 mg/kg/day 0.00 0.00 mg/kg/day

SIC Code Comments:8/8/2012 Page 6 of 6

INITI A L REVIEW EX POSURE REPORT

Chemical ID: P-12-0464

SIC CODE EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 2 RELEASE ACTIVITY: Use: PDM1

SIC CODE DESCRIPT ION:

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

8.00 High