September 24, 2003 INITIAL REVIEW EXPOSURE REPORT Case Number: P030793 Assessor: Kennedy ENVIRONMENTAL RELEASES Scenario#: 1 Number of Release Sites: Release Activity: Release Description: WATER LANDFILL INCINER LAND/INCIN FUGITIVE Total Releases: 468.00 0.00 0.00 0.00 53.04 (kg/yr) (kg/yr) (kg/yr) (kg/yr) (kg/yr) Release Days/yr: 78. 78. Per Site Release: 3.00 0.00 0.00 0.00 0.34 (kg/day) (kg/yr) (kg/yr) (kg/yr) (kg/day) Remarks:

Consumer use expected? No, consumer use is not expected.INITIAL REVIEW EXPOSURE REPORT CASE NUMBER:P030793 SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #:1 RELEASE ACTIVITY: SIC-CODE DESCRIPTION: Pl astic Products Manufacture SIC-CODE (S):3079 EXPOSED POPULATION:Adult

WASTE WATER TREATMENT REMOVAL (%) COC (μg/L) RELEASE DAYS PRE-TREATMENT RELEASE

(kg/day) POST-TREATMENT RELEASE

(kg/day) BCF (L/kg) 99. 10.00 78. 3. 3.00E-02 3.16

AQUATIC EXPOSURE ESTIMATES - SURFACE WATER PLANT TYPE % ILE FACILITY STREAM FLOW (MLD) STREAM CONC. ( : g/l) Harmonic

MEAN 30Q5 7Q10 1Q10 Harmonic MEAN 30Q5 7Q10 1Q10 ALL 50 421.74 151.70 99.55 81.26 7.11E-02 0.20 0.30 0.37 ALL 10 36.05 10.75 6.43 5.35 0.83 2.79 4.67 5.61

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 LADD pot 1.19E-07 1.39E-06 mg/kg/day 1.61E-09 1.88E-08 mg/kg/day LADC pot6.08E-06 7.11E-05 mg/L 1.92E-05 2.25E-04 mg/kg Chronic Non-Cancer ADD pot 2.96E-07 3.47E-06 mg/kg/day 4.01E-09 4.70E-08 mg/kg/day ADC pot1.52E-05 1.78E-04 mg/L 4.80E-05 5.62E-04 mg/kg Acute ADR pot 1.65E-05 2.33E-04 mg/kg/day 4.04E-07 4.72E-06 mg/kg/dayINITIAL REVIEW EXPOSURE REPORT CASE NUMBER: P030793

SIC CODE EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 1 RELEASE ACTIVITY: SIC CODE DESCRIPTION: Pl astic Products Manufacture ASSOCIATED SIC CODES: 3079 SIC CODE RESULTS COC ( : g/L) % yr exceeded Days/yr exceeded Release days/year Loading (kg/site/day) Waste Water Treatment (%) High/Avg Analysis 10.00 0.75 3 78 3.00 99.00 HighINITIAL REVIEW EXPOSURE REPORT CASE NUMBER:P030793

INHALATION EXPOSURE ESTIMATES FROM FUGITIVE RELEASES

SCENARIO #:1 RELEASE ACTIVITY: RELEASE DESCRIPTION: METHOD OF CALCULATION:Turner EXPOSED POPULATION:Adult

NUMBER OF SITES % TREATMENT TYPE OF REMOVAL PRE-TREAT RELEASE (kg/yr) POST-TREAT RELEASE (kg/yr) 2. 0.00 None 53.04 53.04

Exposure Units Results ASSUMPTIONS ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr) Cancer LADD pot(mg/kg/day) 9.75E-06 30.00 75.00 71.80 0.55 LADC pot(mg/m 3 ) 5.30E-05 30.00 75.00 NA NA Chronic Non-Cancer ADD pot(mg/kg/day) 2.44E-05 30.00 30.00 71.80 0.55 ADC pot(mg/m 3 ) 1.33E-04 30.00 30.00 NA NAINITIAL REVIEW EXPOSURE REPORT Case Number: P030793 Assessor: Kennedy ENVIRONMENTAL RELEASES Scenario#: 2 Number of Release Sites: 2. Release Activity: - Fina, Dow Release Description: WATER LANDFILL INCINER LAND/INCIN FUGITIVE Total Releases: 1396.56 0.00 0.00 0.00 45.54 (kg/yr) (kg/yr) (kg/yr) (kg/yr) (kg/yr) Release Days/yr: 33. 33. Per Site Release: 21.16 0.00 0.00 0.00 0.69 (kg/day) (kg/yr) (kg/yr) (kg/yr) (kg/day) Remarks: Assumed water release of 18.157 kg/site/day over 33 days overlaps with release of 3 kg/site/day over 78 days. Assumed air releas e of 0.3466 kg/site/day over 33 days overlaps with release of 0.3426 kg/site/day over 78 days.INITIAL REVIEW EXPOSURE REPORT CASE NUMBER:P030793 SIC-CODE BASED HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #:2 RELEASE ACTIVITY: - Fina, Dow SIC-CODE DESCRIPTION:Pl astic Products Manufacture SIC-CODE (S):3079 EXPOSED POPULATION:Adult

WASTE WATER TREATMENT REMOVAL (%) COC (μg/L) RELEASE DAYS PRE-TREATMENT RELEASE

(kg/day) POST-TREATMENT RELEASE

(kg/day) BCF (L/kg) 99. 10.00 33. 21.16 0.21 3.16

AQUATIC EXPOSURE ESTIMATES - SURFACE WATER PLANT TYPE % ILE FACILITY STREAM FLOW (MLD) STREAM CONC. ( : g/l) Harmonic

MEAN 30Q5 7Q10 1Q10 Harmonic MEAN 30Q5 7Q10 1Q10 ALL 50 421.74 151.70 99.55 81.26 0.50 1.39 2.13 2.60 ALL 10 36.05 10.75 6.43 5.35 5.87 19.68 32.91 39.55

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 LADD pot 3.54E-07 4.14E-06 mg/kg/day 4.79E-09 5.61E-08 mg/kg/day LADC pot1.81E-05 2.12E-04 mg/L 5.73E-05 6.71E-04 mg/kg Chronic Non-Cancer ADD pot 8.84E-07 1.03E-05 mg/kg/day 1.20E-08 1.40E-07 mg/kg/day ADC pot4.54E-05 5.31E-04 mg/L 1.43E-04 1.68E-03 mg/kg Acute ADR pot 1.17E-04 1.64E-03 mg/kg/day 2.85E-06 3.33E-05 mg/kg/dayINITIAL REVIEW EXPOSURE REPORT CASE NUMBER: P030793

SIC CODE EXPOSURES TO SURFACE WATER RELEASES

SCENARIO #: 2 RELEASE ACTIVITY: - Fina, Dow SIC CODE DESCRIPTION: Pl astic Products Manufacture ASSOCIATED SIC CODES: 3079 SIC CODE RESULTS COC ( : g/L) % yr exceeded Days/yr exceeded Release days/year Loading (kg/site/day) Waste Water Treatment (%) High/Avg Analysis 10.00 2.36 9 33 21.16 99.00 HighINITIAL REVIEW EXPOSURE REPORT CASE NUMBER:P030793

INHALATION EXPOSURE ESTIMATES FROM FUGITIVE RELEASES

SCENARIO #:2 RELEASE ACTIVITY:- Fina, Dow RELEASE DESCRIPTION: METHOD OF CALCULATION:Turner EXPOSED POPULATION:Adult

NUMBER OF SITES % TREATMENT TYPE OF REMOVAL PRE-TREAT RELEASE (kg/yr) POST-TREAT RELEASE (kg/yr) 2. 0.00 None 45.54 45.54

Exposure Units Results ASSUMPTIONS ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr) Cancer LADD pot(mg/kg/day) 8.37E-06 30.00 75.00 71.80 0.55 LADC pot(mg/m 3 ) 4.55E-05 30.00 75.00 NA NA Chronic Non-Cancer ADD pot(mg/kg/day) 2.09E-05 30.00 30.00 71.80 0.55 ADC pot(mg/m 3 ) 1.14E-04 30.00 30.00 NA NAINITIAL REVIEW EXPOSURE REPORT Case Number: P030793 Assessor: Kennedy ENVIRONMENTAL RELEASES Scenario#: 3 Number of Release Sites: 1. Release Activity: - Exxon, Baytown Release Description: WATER LANDFILL INCINER LAND/INCIN FUGITIVE Total Releases: 234.00 0.00 0.00 0.00 26.52 (kg/yr) (kg/yr) (kg/yr) (kg/yr) (kg/yr) Release Days/yr: 78. 78. Per Site Release: 3.00 0.00 0.00 0.00 0.34 (kg/day) (kg/yr) (kg/yr) (kg/yr) (kg/day) Remarks:INITIAL REVIEW EXPOSURE REPORT CASE NUMBER: P030793 SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES: LAKES, BAYS, ESTUARIES, AND OCEANS SCENARIO #: 3 RELEASE ACTIVITY:Exxon, Baytown This is an active site FACILITY NAME: EXXON CHEMICAL CO USA(BAYTOWN) FACILITY LOCATION: BAYTOWNTX77522 RECEIVING WATER NAME: GALVESTON BAY REACH NUMBER: 12040203003 FACILITY ON REAC H: No DISCHARGE TYPE: Direct NPDES PERMIT #: TX0077887 DATA SOURCE: FacSrch EXPOSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PLANT FLOW (MLD) PRE-TREAT REL (kg/day) POST-TREAT REL (kg/day) BCF (L/kg) 99. 78. 8.03 3. 3.00E-02 3.16

AQUATIC EXPOSURE ESTIMATES MIXING ZONE DILUTION FACTOR WATER CONC ( : g/l) ACUTE SCENARIO 3.30 1.13 CHRONIC SCENARIO 12.50 0.30

FISH INGESTION EXPOSURE ESTIMATES Exposure Units Results ASSUMPTIONS ED (years) AT (years) BW (kg) IR (g/day) Cancer LADD pot(mg/kg/day) 6.75E-09 30.00 75.00 71.80 6.00 LADC pot(mg/kg) 8.08E-05 30.00 75.00 NA NA Chronic Non-Cancer ADD pot(mg/kg/day) 1.69E-08 30.00 30.00 71.80 6.00 ADC pot(mg/kg) 2.02E-04 30.00 30.00 NA NA Acute ADR pot(mg/kg/day) 6.43E-06 1.00 day 1.00 day 71.80 129.00INITIAL REVIEW EXPOSURE REPORT CASE NUMBER:P030793

INHALATION EXPOSURE ESTIMATES FROM FUGITIVE RELEASES

SCENARIO #:3 RELEASE ACTIVITY: - Exxon, Baytown RELEASE DESCRIPTION: METHOD OF CALCULATION:Turner EXPOSED POPULATION:Adult

NUMBER OF SITES % TREATMENT TYPE OF REMOVAL PRE-TREAT RELEASE (kg/yr) POST-TREAT RELEASE (kg/yr) 1. 0.00 None 26.52 26.52

Exposure Units Results ASSUMPTIONS ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr) Cancer LADD pot(mg/kg/day) 9.75E-06 30.00 75.00 71.80 0.55 LADC pot(mg/m 3 ) 5.30E-05 30.00 75.00 NA NA Chronic Non-Cancer ADD pot(mg/kg/day) 2.44E-05 30.00 30.00 71.80 0.55 ADC pot(mg/m 3 ) 1.33E-04 30.00 30.00 NA NAINITIAL REVIEW EXPOSURE REPORT Case Number: P030793 Assessor: Kennedy ENVIRONMENTAL RELEASES Scenario#: 4 Number of Release Sites: 1. Release Activity: - Exxon, Baytown Release Description: WATER LANDFILL INCINER LAND/INCIN FUGITIVE Total Releases: 698.28 0.00 0.00 0.00 22.77 (kg/yr) (kg/yr) (kg/yr) (kg/yr) (kg/yr) Release Days/yr: 33. 33. Per Site Release: 21.16 0.00 0.00 0.00 0.69 (kg/day) (kg/yr) (kg/yr) (kg/yr) (kg/day) Remarks: Assumed water release of 18.157 kg/site/day over 33 days overlaps with release of 3 kg/site/day over 78 days. Assumed air releas e of 0.3466 kg/site/day over 33 days overlaps with release of 0.3426 kg/site/day over 78 days.INITIAL REVIEW EXPOSURE REPORT CASE NUMBER: P030793 SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES: LAKES, BAYS, ESTUARIES, AND OCEANS SCENARIO #: 4 RELEASE ACTIVITY: Exxon, Baytown This is an active site FACILITY NAME: EXXON CHEMICAL CO USA(BAYTOWN) FACILITY LOCATION: BAYTOWNTX77522 RECEIVING WATER NAME: GALVESTON BAY REACH NUMBER: 12040203003 FACILITY ON REAC H: No DISCHARGE TYPE: Direct NPDES PERMIT #: TX0077887 DATA SOURCE: FacSrch EXPOSED POPULATION: Adult

WWT REMOVAL (%) RELEASE DAYS PLANT FLOW (MLD) PRE-TREAT REL (kg/day) POST-TREAT REL (kg/day) BCF (L/kg) 99. 33. 8.03 21.16 0.21 3.16

AQUATIC EXPOSURE ESTIMATES MIXING ZONE DILUTION FACTOR WATER CONC ( : g/l) ACUTE SCENARIO 3.30 7.99 CHRONIC SCENARIO 12.50 2.11

FISH INGESTION EXPOSURE ESTIMATES Exposure Units Results ASSUMPTIONS ED (years) AT (years) BW (kg) IR (g/day) Cancer LADD pot(mg/kg/day) 2.01E-08 30.00 75.00 71.80 6.00 LADC pot(mg/kg) 2.41E-04 30.00 75.00 NA NA Chronic Non-Cancer ADD pot(mg/kg/day) 5.03E-08 30.00 30.00 71.80 6.00 ADC pot(mg/kg) 6.03E-04 30.00 30.00 NA NA Acute ADR pot(mg/kg/day) 4.54E-05 1.00 day 1.00 day 71.80 129.00INITIAL REVIEW EXPOSURE REPORT CASE NUMBER:P030793

INHALATION EXPOSURE ESTIMATES FROM FUGITIVE RELEASES

SCENARIO #:4 RELEASE ACTIVITY: - Exxon, Baytown RELEASE DESCRIPTION: METHOD OF CALCULATION:Turner EXPOSED POPULATION:Adult

NUMBER OF SITES % TREATMENT TYPE OF REMOVAL PRE-TREAT RELEASE (kg/yr) POST-TREAT RELEASE (kg/yr) 1. 0.00 None 22.77 22.77

Exposure Units Results ASSUMPTIONS ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr) Cancer LADD pot(mg/kg/day) 8.37E-06 30.00 75.00 71.80 0.55 LADC pot(mg/m 3 ) 4.55E-05 30.00 75.00 NA NA Chronic Non-Cancer ADD pot(mg/kg/day) 2.09E-05 30.00 30.00 71.80 0.55 ADC pot(mg/m 3 ) 1.14E-04 30.00 30.00 NA NA