### INITIAL REVIEW EXPOSURE REPORT (IRExR)

Chemical ID: P-10-0486 Reviewer: Kwon/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 = 28 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

Proc1: Max ADR: max acute eco 1.29E+00 --- --- --- 2.68E+04 --- --- --- --- --- ---

Proc1: Max LADD --- 1.61E-04 --- --- --- --- --- --- --- --- --- Proc2: Max ADR: max acute eco 3.90E-01 --- --- --- 8.02E+03 --- --- --- --- --- ---

Proc2: PDM1 --- --- --- --- 2.51E+03 99 99 --- --- --- --- ---

Proc2: Max LADD --- 1.06E-03 --- --- --- --- --- --- --- --- --- Use: Max ADR: max acute eco 2.62E+00 --- --- --- 5.73E+04 --- --- 1.01E+00 --- --- ---

Use: PDM1 --- --- --- --- 2.05E-02 0 0 --- --- --- --- ---

Use: Max LADD --- 1.17E-04 --- --- --- --- --- --- 8.09E-02 --- ---

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). 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 7Q 10 streamflow, which is defined as the average daily streamflow of the seven consecutive days of lowest flow within a ten year period.

Remarks:8/25/2010 Page 2 of 24



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

Parameter Exp Based Persistent Exceedance Value Drinking (Surface) Wate r Dose (mg/kg/day) Yes NA 2.62E+00 Fish Ingestion Dose (mg/kg/day) No NA Inhalation Dose (mg/kg/day) Yes NA 1.01E+00 Groundwater Dose (mg/kg/day) No NA Surface Water Release After Treatment (kg/yr) Yes NA 6.93E+03 Total Release After Treatment (kg/yr) Yes NA 9.05E+05 Consumer Use? No



### Fate test recommendations?: (default is NA)INITIAL REVI EW EXPOSURE REPORT

Chemical ID: P-10-0486 Assessor: Kwon/SD

ENVIRONMENTAL RELEASES

Scenario#:1 Number of Release Sites: 1. Release Activity: Proc1: Max ADR Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases: 193.00 N/A 0.00 N/A (kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge Release Days/yr: 1.00 0.00/0.00 0.00 N/A

Per Site Release: 193.00 N/A/0.00 0.00 N/A (kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

Remarks:INITIAL REV IEW EX POSURE REPORT

Chemical ID: P-10-0486 SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES

SCENARIO NUMBER:1 RELEASE ACTIVITY: Proc1: Max ADR

FACILITY NAME: GALENA PARK CITY OF STP NO. 2

FACILITY LOCATION: GALENA PARK TX 77547

RECEIVING WATER NAME: BUFFALO BAYOU

REACH NUMBER: 12040104017 FACILITY ON REACH: No DISCHARGE TYPE: Direct

NPDES PERMIT #: TX0057177 EXPOSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PRETREATMENT RELEASE (kg/site/day) POSTTREATMENT RELEASE (kg/site/day) DWT (%) BCF (L/kg)
25. 1. 193. 144.75 0.00 0.00

AQUATIC EXPOSURE ESTIMATES - SURFACE WATER

FLOW DESCRIPTOR Harmonic Mean 30Q5 7Q10 1Q10 PLANT FLOW (MLD) 110.16 9.37 5.40 4.53 NA CONCENTRATION ( μ g/L) 1313.95 1.55E+04 2.68E+04 3.20E+04 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 2.81E-05 mg/kg/day 0.00 mg/kg/day

LADC pot 1.44E-03 mg/L 0.00 mg/kg

Acute

ADR pot 1.29 mg/kg/day 0.00 mg/kg/day

Surface Water Comments:INITIAL REVI EW EXPOSURE REPORT

Chemical ID: P-10-0486 Assessor: Kwon/SD

ENVIRONMENTAL RELEASES

Scenario#:2 Number of Release Sites: 1. Release Activity: Proc1: Max LADD Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases: 1106.00 N/A 0.00 N/A (kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge Release Days/yr: 1.00 0.00/0.00 0.00 N/A

Per Site Release: 1106.00 N/A/0.00 0.00 N/A (kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

Remarks:INITIAL REV IEW EX POSURE REPORT

Chemical ID: P-10-0486 SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES

SCENARIO NUMBER:2 RELEASE ACTIVITY: Proc1: Max LADD

FACILITY NAME: GALENA PARK CITY OF STP NO. 2

FACILITY LOCATION: GALENA PARK TX 77547

RECEIVING WATER NAME: BUFFALO BAYOU

REACH NUMBER: 12040104017 FACILITY ON REACH: No DISCHARGE TYPE: Direct

NPDES PERMIT #: TX0057177 EXPOSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PRETREATMENT RELEASE (kg/site/day) POSTTREATMENT RELEASE (kg/site/day) DWT (%) BCF (L/kg)
25. 1. 1106. 829.50 0.00 0.00

AQUATIC EXPOSURE ESTIMATES - SURFACE WATER

FLOW DESCRIPTOR Harmonic Mean 30Q5 7Q10 1Q10 PLANT FLOW (MLD) 110.16 9.37 5.40 4.53 NA 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 1.61E-04 mg/kg/day 0.00 mg/kg/day

LADC pot 8.25E-03 mg/L 0.00 mg/kg

Acute

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

Surface Water Comments:INITIAL REVI EW EXPOSURE REPORT

Chemical ID: P-10-0486 Assessor: Kwon/SD

ENVIRONMENTAL RELEASES

Scenario#:3 Number of Release Sites: 3. Release Activity: Proc2: Max ADR Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases: 249.00 N/A 0.00 N/A (kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge Release Days/yr: 1.00 0.00/0.00 0.00 N/A

Per Site Release: 83.00 N/A/0.00 0.00 N/A (kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

Remarks:8/25/2010 Page 8 of 24

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-10-0486

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

SCENARIO #: 3 Number of Site s: 3 RELEASE ACTIVITY:Proc2: 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)
25.00 1. 83. 62.25 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 50 288.00 123.84 78.18 66.05 216.15 502.66 796.24 942.47

ALL 10 39.60 13.29 7.76 7.57 1571.97 4683.97 8021.91 8223.25

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 4.62E-06 3.36E-05 mg/kg/day 0.00 0.00 mg/kg/day

LADC pot 2.37E-04 1.72E-03 mg/L 0.00 0.00 mg/kg

Acute

ADR pot 4.20E-02 0.39 mg/kg/day 0.00 0.00 mg/kg/day

SIC Code Comments:INITIAL REVI EW EXPOSURE REPORT

Chemical ID: P-10-0486 Assessor: Kwon/SD

ENVIRONMENTAL RELEASES

Scenario#:4 Number of Release Sites: 3. Release Activity: Proc2: PDM1 Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases: 7722.00 N/A 0.00 N/A (kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge Release Days/yr: 99.00 0.00/0.00 0.00 N/A

Per Site Release: 26.00 N/A/0.00 0.00 N/A (kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

Remarks:8/25/2010 Page 10 of 24

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-10-0486

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

SCENARIO #: 4 Number of Site s: 3 RELEASE ACTIVITY:Proc2: 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)
25.00 99. 26. 19.50 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 50 288.00 123.84 78.18 66.05 67.71 157.46 249.42 295.23

ALL 10 39.60 13.29 7.76 7.57 492.42 1467.27 2512.89 2575.96

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 1.43E-04 1.04E-03 mg/kg/day 0.00 0.00 mg/kg/day

LADC pot 7.35E-03 5.34E-02 mg/L 0.00 0.00 mg/kg

Acute

ADR pot 1.32E-02 0.12 mg/kg/day 0.00 0.00 mg/kg/day

SIC Code Comments:INITIAL REV IEW EX POSURE REPORT

Chemical ID: P-10-0486

SIC CODE EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 4 RELEASE ACTIVITY: Proc2: 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

28.00 27 99 99.00 26.00 25.00 High

4.00 27 99 99.00 26.00 25.00 High

Note COC exceedance days > 20INITIAL REVI EW EXPOSURE REPORT

Chemical ID: P-10-0486 Assessor: Kwon/SD

ENVIRONMENTAL RELEASES

Scenario#:5 Number of Release Sites: 3. Release Activity: Proc2: Max LADD Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases: 7893.00 N/A 0.00 N/A (kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge Release Days/yr: 1.00 0.00/0.00 0.00 N/A

Per Site Release: 2631.00 N/A/0.00 0.00 N/A (kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

Remarks:8/25/2010 Page 13 of 24

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-10-0486

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

SCENARIO #: 5 Number of Site s: 3 RELEASE ACTIVITY:Proc2: 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)
25.00 1. 2631. 1973.25 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 50 288.00 123.84 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 1.46E-04 1.06E-03 mg/kg/day 0.00 0.00 mg/kg/day

LADC pot 7.51E-03 5.46E-02 mg/L 0.00 0.00 mg/kg

Acute

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

SIC Code Comments:INITIAL REVI EW EXPOSURE REPORT

Chemical ID: P-10-0486 Assessor: Kwon/SD

ENVIRONMENTAL RELEASES

Scenario#:6 Number of Release Sites: 3. Release Activity: Use: Max ADR Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases: 243.00 N/A 8.98E+05 N/A (kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge Release Days/yr: 1.00 0.00/0.00 365.00 N/A

Per Site Release: 81.00 N/A/0.00 820.19 N/A (kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

Remarks:8/25/2010 Page 15 of 24

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-10-0486

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

SCENARIO #: 6 Number of Site s: 3 RELEASE ACTIVITY:Use: Max ADR

SIC-CODE DESCRIPTION: POTW's (All facilities) SIC-CODE (S): 4952 EX POSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PRETREATMENT RELEASE (kg/site/day) POSTTREATMENT RELEASE (kg/site/day) DWT (%) BCF (L/kg)
25.00 1. 81. 60.75 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 50 125.56 44.02 26.80 22.53 483.83 1380.05 2266.79 2696.40

ALL 10 11.11 1.94 1.06 0.96 5468.05 3.13E+04 5.73E+04 6.33E+04

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 1.03E-05 1.17E-04 mg/kg/day 0.00 0.00 mg/kg/day

LADC pot 5.30E-04 5.99E-03 mg/L 0.00 0.00 mg/kg

Acute

ADR pot 0.12 2.62 mg/kg/day 0.00 0.00 mg/kg/day

SIC Code Comments:INITIAL REV IEW EX POSURE REPORT Chemical ID: P-10-0486

INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)

SCENARIO #: 6 RELEASE ACTIVITY:Use: Max ADR

RELEASE DESCRIPTION:

METHOD OF CALCULATION: Screen3
EXPOSED POPULATION: Adult

Number of Sites: 3. Per Site Fugitive Release: NA kg/site/day Fugitive Release Days per Year: NA days % Removal via Fugitive Release: 0.00 % Total Fugitive Release: 3.00 kg/yr Max Annual Average Air Concentration (Fugitive): 0.00 μg/m 3

Max 24 Hour Average Air Concentration(Fugitive): 0.00 μg/m 3

Per Site Stack Release: 820.19 kg/site/day Stack Release Days per Year: 365.00 days

% Removal via Stack Release: 0.00 %

Total Stack Release: 8.98E+05 kg/yr Max Annual Average Air Concen tration (Stack): 1100.00 μg/m 3
Max 24 Hour Average Air Concentration (Stack): 5520.00 μg/m 3

ASSUMPTIONS
Exposure Units Results (Stack) Results (Fugitive) ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr)

Cancer

LADD pot (mg/kg/day) 8.09E-02 N/A 30.00 75.00 71.80 0.55

LADC pot (mg/m 3 ) 0.44 N/A 30.00 75.00 NA NA
Acute

ADR pot (mg/kg/day) 1.01 N/A NA 1 day 71.80 0.55

Inhalation Comments:Stack Parameter Data Fugitive Parameter Data Stack Height 10.00 m Release Height: N/A

Inside Stack Diameter: 0.10 m Length of Release Opening: N/A

Stack Gas Exit Velocity: 0.10 m/sec Width of Release Opening: N/A

Stack Gas Temperature: 293.00 K

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 mINITIAL REVI EW EXPOSURE REPORT

Chemical ID: P-10-0486 Assessor: Kwon/SD

ENVIRONMENTAL RELEASES

Scenario#:7 Number of Release Sites: 3. Release Activity: Use: PDM1 Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases: 3.18E-02 N/A 0.00 N/A (kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge Release Days/yr: 365.00 0.00/0.00 0.00 N/A

Per Site Release: 2.90E-05 N/A/0.00 0.00 N/A (kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

Remarks:8/25/2010 Page 19 of 24

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-10-0486

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

SCENARIO #: 7 Number of S ites: 3 RELEASE ACTIVITY:Use: PDM1

SIC-CODE DESCRIPTION: POTW's (All facilities) SIC-CODE (S): 4952 EX POSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PRETREATMENT RELEASE (kg/site/day) POSTTREATMENT RELEASE (kg/site/day) DWT (%) BCF (L/kg)
25.00 365. 0.00003 2.18E-05 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 50 125.56 44.02 26.80 22.53 1.73E-04 4.94E-04 8.12E-04 9.65E-04

ALL 10 11.11 1.94 1.06 0.96 1.96E-03 1.12E-02 2.05E-02 2.27E-02

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 1.35E-09 1.53E-08 mg/kg/day 0.00 0.00 mg/kg/day

LADC pot 6.93E-08 7.83E-07 mg/L 0.00 0.00 mg/kg

Acute

ADR pot 4.13E-08 9.37E-07 mg/kg/day 0.00 0.00 mg/kg/day

SIC Code Comments:INITIAL REV IEW EX POSURE REPORT

Chemical ID: P-10-0486

SIC CODE EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 7 RELEASE ACTIVITY: Use: PDM1

SIC CODE DESCRI PTION: POTW's (All facilities)

ASSOCIATED SIC CODES: 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

28.00 0 0 365.00 2.90E-05 25.00 High

4.00 0 0 365.00 2.90E-05 25.00 HighINITIAL REVI EW EXPOSURE REPORT

Chemical ID: P-10-0486 Assessor: Kwon/SD

ENVIRONMENTAL RELEASES

Scenario#:8 Number of Release Sites: 3. Release Activity: Use: Max LADD Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases: 243.03 N/A 8.97E+05 N/A (kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge Release Days/yr: 1.00 0.00/0.00 1.00 N/A

Per Site Release: 81.01 N/A/0.00 2.99E+05 N/A (kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

Remarks:8/25/2010 Page 22 of 24

INITIAL REVIEW EX POSURE REPORT

Chemical ID: P-10-0486

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

SCENARIO #: 8 Number of Site s: 3 RELEASE ACTIVITY:Use: Max LADD

SIC-CODE DESCRIPTION: POTW's (All facilities) SIC-CODE (S): 4952 EX POSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PRETREATMENT RELEASE (kg/site/day) POSTTREATMENT RELEASE (kg/site/day) DWT (%) BCF (L/kg)
25.00 1. 81.01 60.76 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 50 125.56 44.02 26.80 22.53 N/A N/A N/A N/A

ALL 10 11.11 1.94 1.06 0.96 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 1.03E-05 1.17E-04 mg/kg/day 0.00 0.00 mg/kg/day

LADC pot 5.30E-04 5.99E-03 mg/L 0.00 0.00 mg/kg

Acute

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

SIC Code Comments:INITIAL REV IEW EX POSURE REPORT Chemical ID: P-10-0486

INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)

SCENARIO #: 8 RELEASE ACTIVITY:Use: Max LADD

RELEASE DESCRIPTION:

METHOD OF CALCULATION: Screen3
EXPOSED POPULATION: Adult

Number of Sites: 3. Per Site Fugitive Release: NA kg/site/day Fugitive Release Days per Year: NA days % Removal via Fugitive Release: 0.00 % Total Fugitive Release: 3.00 kg/yr Max Annual Average Air Concentration (Fugitive): 0.00 μg/m 3

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

Per Site Stack Release: 2.99E+05 kg/site/day Stack Release Days per Year: 1.00 days

% Removal via Stack Release: 0.00 %

Total Stack Release: 8.97E+05 kg/yr Max Annual Average Air Concen tration (Stack): 1100.00 μg/m 3
Max 24 Hour Average Air Concentration (Stack): N/A μg/m 3

ASSUMPTIONS
Exposure Units Results (Stack) Results (Fugitive) ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr)

Cancer

LADD pot (mg/kg/day) 8.09E-02 N/A 30.00 75.00 71.80 0.55

LADC pot (mg/m 3 ) 0.44 N/A 30.00 75.00 NA NA
Acute

ADR pot (mg/kg/day) N/A N/A NA 1 day 71.80 0.55

Inhalation Comments:8/25/2010 Page 24 of 24

Stack Parameter Data Fugitive Parameter Data Stack Height 10.00 m Release Height: N/A

Inside Stack Diameter: 0.10 m Length of Release Opening: N/A

Stack Gas Exit Velocity: 0.10 m/sec Width of Release Opening: N/A

Stack Gas Temperature: 293.00 K

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 m