INITIAL REVIEW EXPOSURE REPORT (IRExR) 

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

 

 

Results Table: Dose, Concentration, and Days Exceeded Results Summary 

Exposure Scenario1 Water Landfill Stack Air Fugitive Air 

Drinking Water Fish Ingestion 

ADR LADD ADR LADD 7Q104 

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 Manufacturing (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 (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: 

EPA SANITIZED Page 1 of 24
8/25/2010 Page 2 of 24 

Results Table: Exposure Based (XB)/Persistent (P2B2) Criteria 

Parameter Exp Based Persistent Exceedance Value 

Drinking (Surface) Water 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)

EPA SANITIZED Page 2 of 24
 INITIAL REVIEW 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: 

EPA SANITIZED Page 3 of 24
INITIAL REVIEW EXPOSURE 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 (μg/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 

LADDpot 2.81E-05 mg/kg/day 0.00 mg/kg/day 

LADCpot 1.44E-03 mg/L 0.00 mg/kg 

Acute 

ADRpot 1.29 mg/kg/day 0.00 mg/kg/day 

Surface Water Comments: 

EPA SANITIZED Page 4 of 24
 INITIAL REVIEW 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: 

EPA SANITIZED Page 5 of 24
INITIAL REVIEW EXPOSURE 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 (μg/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 

LADDpot 1.61E-04 mg/kg/day 0.00 mg/kg/day 

LADCpot 8.25E-03 mg/L 0.00 mg/kg 

Acute 

ADRpot N/A mg/kg/day N/A mg/kg/day 

Surface Water Comments: 

EPA SANITIZED Page 6 of 24
 INITIAL REVIEW 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: 

EPA SANITIZED Page 7 of 24
8/25/2010 Page 8 of 24 

INITIAL REVIEW EXPOSURE REPORT 

 Chemical ID: P-10-0486 

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

SCENARIO #: 3 Number of Sites: 3 RELEASE ACTIVITY:Proc2: 

Max ADR 

SIC-CODE DESCRIPTION: POTW (Indust., includes POTWs which receive ind. disch.) 

SIC-CODE (S): Subset of 4952 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. (μg/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 INGESTION EXPOSURE ESTIMATES 

Exposure Units 

Drinking Water Results Drinking 

Water Units Fish Ingestion Results 

Fish 

Ingestion 

Units 

50% 10% 50% 10% 

Cancer 

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

LADCpot 2.37E-04 1.72E-03 mg/L 0.00 0.00 mg/kg 

Acute 

ADRpot 4.20E-02 0.39 mg/kg/day 0.00 0.00 mg/kg/day 

SIC Code Comments: 

EPA SANITIZED Page 8 of 24
 INITIAL REVIEW 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: 

EPA SANITIZED Page 9 of 24
8/25/2010 Page 10 of 24 

INITIAL REVIEW EXPOSURE REPORT 

 Chemical ID: P-10-0486 

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

SCENARIO #: 4 Number of Sites: 3 RELEASE ACTIVITY:Proc2: 

PDM1 

SIC-CODE DESCRIPTION: POTW (Indust., includes POTWs which receive ind. disch.) 

SIC-CODE (S): Subset of 4952 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. (μg/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 INGESTION EXPOSURE ESTIMATES 

Exposure Units 

Drinking Water Results Drinking 

Water Units Fish Ingestion Results 

Fish 

Ingestion 

Units 

50% 10% 50% 10% 

Cancer 

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

LADCpot 7.35E-03 5.34E-02 mg/L 0.00 0.00 mg/kg 

Acute 

ADRpot 1.32E-02 0.12 mg/kg/day 0.00 0.00 mg/kg/day 

SIC Code Comments: 

EPA SANITIZED Page 10 of 24
INITIAL REVIEW EXPOSURE 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 (μg/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 > 20 

EPA SANITIZED Page 11 of 24
 INITIAL REVIEW 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: 

EPA SANITIZED Page 12 of 24
8/25/2010 Page 13 of 24 

INITIAL REVIEW EXPOSURE REPORT 

 Chemical ID: P-10-0486 

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

SCENARIO #: 5 Number of Sites: 3 RELEASE ACTIVITY:Proc2: 

Max LADD 

SIC-CODE DESCRIPTION: POTW (Indust., includes POTWs which receive ind. disch.) 

SIC-CODE (S): Subset of 4952 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. (μg/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 INGESTION EXPOSURE ESTIMATES 

Exposure Units 

Drinking Water Results Drinking 

Water Units Fish Ingestion Results 

Fish 

Ingestion 

Units 

50% 10% 50% 10% 

Cancer 

LADDpot 1.46E-04 1.06E-03 mg/kg/day 0.00 0.00 mg/kg/day 

LADCpot 7.51E-03 5.46E-02 mg/L 0.00 0.00 mg/kg 

Acute 

ADRpot N/A N/A mg/kg/day N/A N/A mg/kg/day 

SIC Code Comments: 

EPA SANITIZED Page 13 of 24
 INITIAL REVIEW 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: 

EPA SANITIZED Page 14 of 24
8/25/2010 Page 15 of 24 

INITIAL REVIEW EXPOSURE REPORT 

 Chemical ID: P-10-0486 

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

SCENARIO #: 6 Number of Sites: 3 RELEASE ACTIVITY:Use: Max 

ADR 

SIC-CODE DESCRIPTION: POTW's (All facilities) 

SIC-CODE (S): 4952 EXPOSED 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. (μg/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 INGESTION EXPOSURE ESTIMATES 

Exposure Units 

Drinking Water Results Drinking 

Water Units Fish Ingestion Results 

Fish 

Ingestion 

Units 

50% 10% 50% 10% 

Cancer 

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

LADCpot 5.30E-04 5.99E-03 mg/L 0.00 0.00 mg/kg 

Acute 

ADRpot 0.12 2.62 mg/kg/day 0.00 0.00 mg/kg/day 

SIC Code Comments: 

EPA SANITIZED Page 15 of 24
INITIAL REVIEW EXPOSURE 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/m3

Max 24 Hour Average Air 

Concentration(Fugitive): 

0.00 μg/m3

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 Concentration (Stack): 1100.00 μg/m3

Max 24 Hour Average Air Concentration (Stack): 5520.00 μg/m3

ASSUMPTIONS 

Exposure Units 

Results 

(Stack) 

Results 

(Fugitive) ED 

(years) 

AT 

(years) 

BW 

(kg) 

Inh. Rate 

(m3/hr) 

Cancer 

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

LADCpot (mg/m3) 0.44 N/A 30.00 75.00 NA NA 

Acute 

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

Inhalation Comments: 

EPA SANITIZED Page 16 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 

EPA SANITIZED Page 17 of 24
 INITIAL REVIEW 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: 

EPA SANITIZED Page 18 of 24
8/25/2010 Page 19 of 24 

INITIAL REVIEW EXPOSURE REPORT 

 Chemical ID: P-10-0486 

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

SCENARIO #: 7 Number of Sites: 3 RELEASE ACTIVITY:Use: 

PDM1 

SIC-CODE DESCRIPTION: POTW's (All facilities) 

SIC-CODE (S): 4952 EXPOSED 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. (μg/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 INGESTION EXPOSURE ESTIMATES 

Exposure Units 

Drinking Water Results Drinking 

Water Units Fish Ingestion Results 

Fish 

Ingestion 

Units 

50% 10% 50% 10% 

Cancer 

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

LADCpot 6.93E-08 7.83E-07 mg/L 0.00 0.00 mg/kg 

Acute 

ADRpot 4.13E-08 9.37E-07 mg/kg/day 0.00 0.00 mg/kg/day 

SIC Code Comments: 

EPA SANITIZED Page 19 of 24
INITIAL REVIEW EXPOSURE REPORT 

 Chemical ID: P-10-0486 

SIC CODE EXPOSURES TO SURFACE WATER RELEASES 

SCENARIO #: 7 RELEASE ACTIVITY: Use: PDM1 

SIC CODE DESCRIPTION: POTW's (All facilities) 

ASSOCIATED SIC CODES: 4952 

SIC CODE RESULTS 

COC (μg/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 High 

EPA SANITIZED Page 20 of 24
 INITIAL REVIEW 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: 

EPA SANITIZED Page 21 of 24
8/25/2010 Page 22 of 24 

INITIAL REVIEW EXPOSURE REPORT 

 Chemical ID: P-10-0486 

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

SCENARIO #: 8 Number of Sites: 3 RELEASE ACTIVITY:Use: Max 

LADD 

SIC-CODE DESCRIPTION: POTW's (All facilities) 

SIC-CODE (S): 4952 EXPOSED 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. (μg/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 INGESTION EXPOSURE ESTIMATES 

Exposure Units 

Drinking Water Results Drinking 

Water Units Fish Ingestion Results 

Fish 

Ingestion 

Units 

50% 10% 50% 10% 

Cancer 

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

LADCpot 5.30E-04 5.99E-03 mg/L 0.00 0.00 mg/kg 

Acute 

ADRpot N/A N/A mg/kg/day N/A N/A mg/kg/day 

SIC Code Comments: 

EPA SANITIZED Page 22 of 24
INITIAL REVIEW EXPOSURE 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/m3

Max 24 Hour Average Air 

Concentration(Fugitive): 

N/A μg/m3

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 Concentration (Stack): 1100.00 μg/m3

Max 24 Hour Average Air Concentration (Stack): N/A μg/m3

ASSUMPTIONS 

Exposure Units 

Results 

(Stack) 

Results 

(Fugitive) ED 

(years) 

AT 

(years) 

BW 

(kg) 

Inh. Rate 

(m3/hr) 

Cancer 

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

LADCpot (mg/m3) 0.44 N/A 30.00 75.00 NA NA 

Acute 

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

Inhalation Comments: 

EPA SANITIZED Page 23 of 24
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 

EPA SANITIZED Page 24 of 24