2/10/06 FINAL INITIAL REVIEW EXPOSURE REPORT Case Number: P060262c Assessor: Delpire ENVIRONMENTAL RELEASES Scenario#: 1 Number of Release Sites: 1. Release Activity: MFG Release Description: WATER LANDFILL INCINER LAND/INCIN FUGITIVE Total Releases: 290.00 0.00 290.00 0.00 0.00 (kg/yr) (kg/yr) (kg/yr) (kg/yr) (kg/yr) Release Days/yr: 1. 0. Per Site Release: 290.00 0.00 290.00 0.00 0.00 (kg/day) (kg/yr) (kg/yr) (kg/yr) (kg/day) Remarks: Release is to water or incineration. Incineration release is below assessment threshold.

Consumer use expected? No, consumer use is not expected.

Parameter Exp Based Persistent Exceedance value Drinking (Surface) Water Dose (mg/kg/day) Yes N/A 0.12 Fish Ingestion Dose (mg/kg/day) Yes N/A 0.36 Inhalation Dose (mg/kg/day) No N/A Groundwater Dose (mg/kg/day) No N/A Surface Water Release after treatment (kg/yr) No N/A Total Release After Treatment (kg/yr) No N/A Consumer Exposure Dose? No

FATE TESTING RECOMMENDATIONS: See P-06-0263C .INITIAL REVIEW EXPOSURE REPORT --- CASE NUMBER: P060262c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 1a RELEASE ACTIVITY: MFG Note: This is an active site FACILITY NAME: CORSICANA CITY OF (STP NO. 2) FACILITY LOCATION: CORSICANATX75110 RECEIVING WATER NAME: CHAMBERS CR REACH NUMBER: 12030109002 FACILITY ON REAC H: No DISCHARGE TYPE: Direct NPDES PERMIT #: TX0056731 DATA SOURCE: FacSrch EXPOSED POPULATION: Adult

WWT REMOVAL (%) COC (μg/L) RELEASE DAYS PRE-TREAT RELEASE (kg/day) POST-TREAT RELEASE (kg/day) BCF (L/kg) 90. 40.00 1. 290. 29.00 679.00

AQUATIC EXPOSURE ESTIMATES - SURFACE WATER FLOW DESCRIPTOR Harmonic Mean 30Q5 7Q10 1Q10 PLANT FLOW (MLD) 98.46 19.48 11.52 9.61 NA CONCENTRATION ( : g/L) 294.52 1488.73 2516.71 3017.99 NA

DRINKING WATER INGESTION AND FISHINGESTION EXPOSURE ESTIMATES Exposure Units Drinking Water Results Drinking Water Units Fish Ingestion Results Fish Ingestion Units Cancer LADD pot(mg/kg/day) 6.29E-06 mg/kg/day 1.83E-05 mg/kg/day LADC pot(mg/L) 3.23E-04 mg/L 0.22 mg/kg Chronic Non-Cancer ADD pot(mg/kg/day) 1.57E-05 mg/kg/day 4.58E-05 mg/kg/day ADC pot(mg/L) 8.07E-04 mg/L 0.55 mg/kg Acute ADR pot(mg/kg/day) 0.12 mg/kg/day 0.36 mg/kg/dayINITIAL REVIEW EXPOSURE REPORT CASE NUMBER: P060262c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 1a RELEASE ACTIVITY: MFG This is an active site FACILITY NAME: CORSICANA CITY OF (STP NO. 2) FACILITY LOCATION: CORSICANATX75110 RECEIVING STREAM NAME: CHAMBERS CR REACH NUMBER: 12030109002 FACILITY ON REAC H: No DISCHARGE TYPE: Direct NPDES PERMIT #: TX0056731 DATA S OURCE: FacSrch STATION ID: N/A PERIOD OF RECORD:N/A # OBSERVATIONS : N/A # STATIONS ON REACH: N/A 50%ILE FLOW: 680.73 10%ILE FLOW: 11.52 EFFLUENT FLOW:11.52 RESULTS COC ( : g/L) % yr exceeded Days/yr exceeded Release days/year Loading (kg/site/day) Waste Water Treatment (%) 40.00 0.20 1 1 290.00 90.00INITIAL REVIEW EXPOSURE REPORT --- CASE NUMBER: P060262c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 1b RELEASE ACTIVITY: MFG Note: This is an active site FACILITY NAME: GCWDA (WASHBURN TUNNEL FACILIT FACILITY LOCATION: PASADENATX77506 RECEIVING WATER NAME: BUFFALO BAYOU REACH NUMBER: 12040104017 FACILITY ON REACH: Yes DISCHARGE TYPE: Direct NPDES PERMIT #: TX0052591 DATA SOURCE: FacSrch EXPOSED POPULATION: Adult

WWT REMOVAL (%) COC (μg/L) RELEASE DAYS PRE-TREAT RELEASE (kg/day) POST-TREAT RELEASE (kg/day) BCF (L/kg) 90. 10.00 1. 290. 29.00 679.00

AQUATIC EXPOSURE ESTIMATES - SURFACE WATER FLOW DESCRIPTOR Harmonic Mean 30Q5 7Q10 1Q10 PLANT FLOW (MLD) 755.50 272.21 176.68 144.55 NA CONCENTRATION ( : g/L) 38.39 106.54 164.14 200.63 NA

DRINKING WATER INGESTION AND FISHINGESTION EXPOSURE ESTIMATES Exposure Units Drinking Water Results Drinking Water Units Fish Ingestion Results Fish Ingestion Units Cancer LADD pot(mg/kg/day) 8.20E-07 mg/kg/day 2.39E-06 mg/kg/day LADC pot(mg/L) 4.21E-05 mg/L 2.86E-02 mg/kg Chronic Non-Cancer ADD pot(mg/kg/day) 2.05E-06 mg/kg/day 5.97E-06 mg/kg/day ADC pot(mg/L) 1.05E-04 mg/L 7.14E-02 mg/kg Acute ADR pot(mg/kg/day) 8.90E-03 mg/kg/day 4.68E-02 mg/kg/day

Second run for P-06-0262 with COC = 10 ppb and release fromIntergulf/Gulf Coast Waste Disposal, Pasadena, TX (NPDES# TX0052591). Assumes that Buffalo B ayou is nearshore salt/marine water (worst case). Buffalo Bayou flows into Houston Ship Channel, which flows into Galveston Bay.INITIAL REVIEW EXPOSURE REPORT CASE NUMBER: P060262c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 1b RELEASE ACTIVITY: MFG This is an active site FACILITY NAME: GCWDA (WASHBURN TUNNEL FACILIT FACILITY LOCATION: PASADENATX77506 RECEIVING STREAM NAME: BUFFALO BAYOU REACH NUMBER: 12040104017 FACILITY ON REACH: Yes DISCHARGE TYPE: Direct NPDES PERMIT #: TX0052591 DATA S OURCE: FacSrch STATION ID: N/A PERIOD OF RECORD:N/A # OBSERVATIONS : N/A # STATIONS ON REACH: N/A 50%ILE FLOW: 2090.59 10%ILE FLOW: 176.68 EFFLUENT FLOW:134.08 RESULTS COC ( : g/L) % yr exceeded Days/yr exceeded Release days/year Loading (kg/site/day) Waste Water Treatment (%) 10.00 0.21 1 1 290.00 90.00

Second run for P-06-0262 with COC = 10 ppb and release fromIntergulf/Gulf Coast Waste Disposal, Pasadena, TX (NPDES# TX0052591). Assumes that Buffalo B ayou is nearshore salt/marine water (worst case). Buffalo Bayou flows into Houston Ship Channel, which flows into Galveston Bay.INITIAL REVIEW EXPOSURE REPORT

Case Num ber: P060262c Assessor: Delpire ENVIRONMENTAL RELEASES Scenario#: 2 Number of Release Sites: 1. Release Activity: USE Release Description: WATER LANDFILL INCINER LAND/INCIN FUGITIVE Total Releases: 404.20 0.00 400.00 0.00 0.00 (kg/yr) (kg/yr) (kg/yr) (kg/yr) (kg/yr) Release Days/yr: 94. 0. Per Site Release: 4.30 0.00 400.00 0.00 0.00 (kg/day) (kg/yr) (kg/yr) (kg/yr) (kg/day) Remarks: Release is to water or incineration. Incineration release is below assessment threshold.INITIAL REVIEW EXPOSURE REPORT --- CASE NUMBER: P060262c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 2a RELEASE ACTIVITY: USE Note: This is an active site FACILITY NAME: CORSICANA CITY OF (STP NO. 2) FACILITY LOCATION: CORSICANATX75110 RECEIVING WATER NAME: CHAMBERS CR REACH NUMBER: 12030109002 FACILITY ON REACH: No DISCHARGE TYPE: Direct NPDES PERMIT #: TX0056731 DATA SOURCE: FacSrch EXPOSED POPULATION: Adult

WWT REMOVAL (%) COC (μg/L) RELEASE DAYS PRE-TREAT RELEASE (kg/day) POST-TREAT RELEASE (kg/day) BCF (L/kg) 90. 40.00 94. 4.3 0.43 679.00

AQUATIC EXPOSURE ESTIMATES - SURFACE WATER FLOW DESCRIPTOR Harmonic Mean 30Q5 7Q10 1Q10 PLANT FLOW (MLD) 98.46 19.48 11.52 9.61 NA CONCENTRATION ( : g/L) 4.37 22.07 37.32 44.75 NA

DRINKING WATER INGESTION AND FISHINGESTION EXPOSURE ESTIMATES Exposure Units Drinking Water Results Drinking Water Units Fish Ingestion Results Fish Ingestion Units Cancer LADD pot(mg/kg/day) 8.77E-06 mg/kg/day 2.55E-05 mg/kg/day LADC pot(mg/L) 4.50E-04 mg/L 0.31 mg/kg Chronic Non-Cancer ADD pot(mg/kg/day) 2.19E-05 mg/kg/day 6.38E-05 mg/kg/day ADC pot(mg/L) 1.12E-03 mg/L 0.76 mg/kg Acute ADR pot(mg/kg/day) 1.84E-03 mg/kg/day 5.33E-03 mg/kg/dayINITIAL REVIEW EXPOSURE REPORT CASE NUMBER: P060262c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 2a RELEASE ACTIVITY: USE This is an active site FACILITY NAME: CORSICANA CITY OF (STP NO. 2) FACILITY LOCATION: CORSICANATX75110 RECEIVING STREAM NAME: CHAMBERS CR REACH NUMBER: 12030109002 FACILITY ON REACH: No DISCHARGE TYPE: Direct NPDES PERMIT #: TX0056731 DATA S OURCE: FacSrch STATION ID: N/A PERIOD OF RECORD:N/A # OBSERVATIONS : N/A # STATIONS ON REACH: N/A 50%ILE FLOW: 680.73 10%ILE FLOW: 11.52 EFFLUENT FLOW:11.52 RESULTS COC ( : g/L) % yr exceeded Days/yr exceeded Release days/year Loading (kg/site/day) Waste Water Treatment (%) 40.00 0.22 1 94 4.30 90.00INITIAL REVIEW EXPOSURE REPORT --- CASE NUMBER: P060262c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 2b RELEASE ACTIVITY: USE Note: This is an active site FACILITY NAME: GCWDA (WASHBURN TUNNEL FACILIT FACILITY LOCATION: PASADENATX77506 RECEIVING WATER NAME: BUFFALO BAYOU REACH NUMBER: 12040104017 FACILITY ON REACH: Yes DISCHARGE TYPE: Direct NPDES PERMIT #: TX0052591 DATA SOURCE: FacSrch EXPOSED POPULATION: Adult

WWT REMOVAL (%) COC (μg/L) RELEASE DAYS PRE-TREAT RELEASE (kg/day) POST-TREAT RELEASE (kg/day) BCF (L/kg) 90. 10.00 94. 4.3 0.43 679.00

AQUATIC EXPOSURE ESTIMATES - SURFACE WATER FLOW DESCRIPTOR Harmonic Mean 30Q5 7Q10 1Q10 PLANT FLOW (MLD) 755.50 272.21 176.68 144.55 NA CONCENTRATION ( : g/L) 0.57 1.58 2.43 2.97 NA

DRINKING WATER INGESTION AND FISHINGESTION EXPOSURE ESTIMATES Exposure Units Drinking Water Results Drinking Water Units Fish Ingestion Results Fish Ingestion Units Cancer LADD pot(mg/kg/day) 1.14E-06 mg/kg/day 3.33E-06 mg/kg/day LADC pot(mg/L) 5.86E-05 mg/L 3.98E-02 mg/kg Chronic Non-Cancer ADD pot(mg/kg/day) 2.86E-06 mg/kg/day 8.32E-06 mg/kg/day ADC pot(mg/L) 1.47E-04 mg/L 9.95E-02 mg/kg Acute ADR pot(mg/kg/day) 1.32E-04 mg/kg/day 6.94E-04 mg/kg/day

Second run for P-06-0262 with COC = 10 ppb and release fromIntergulf/Gulf Coast Waste Disposal, Pasadena, TX (NPDES# TX0052591). Assumes that Buffalo B ayou is nearshore salt/marine water (worst case). Buffalo Bayou flows into Houston Ship Channel, which flows into Galveston Bay.INITIAL REVIEW EXPOSURE REPORT CASE NUMBER: P060262c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 2b RELEASE ACTIVITY: USE This is an active site FACILITY NAME: GCWDA (WASHBURN TUNNEL FACILIT FACILITY LOCATION: PASADENATX77506 RECEIVING STREAM NAME: BUFFALO BAYOU REACH NUMBER: 12040104017 FACILITY ON REACH: Yes DISCHARGE TYPE: Direct NPDES PERMIT #: TX0052591 DATA S OURCE: FacSrch STATION ID: N/A PERIOD OF RECORD:N/A # OBSERVATIONS : N/A # STATIONS ON REACH: N/A 50%ILE FLOW: 2090.59 10%ILE FLOW: 176.68 EFFLUENT FLOW:134.08 RESULTS COC ( : g/L) % yr exceeded Days/yr exceeded Release days/year Loading (kg/site/day) Waste Water Treatment (%) 10.00 5.26E-02 0 94 4.30 90.00

Second run for P-06-0262 with COC = 10 ppb and release fromIntergulf/Gulf Coast Waste Disposal, Pasadena, TX (NPDES# TX0052591). Assumes that Buffalo B ayou is nearshore salt/marine water (worst case). Buffalo Bayou flows into Houston Ship Channel, which flows into Galveston Bay.