2/10/06 FINAL INITIAL REVIEW EXPOSURE REPORT Case Number: P060263c Assessor: Delpire ENVIRONMENTAL RELEASES Scenario#: 1 Number of Release Sites: 1. Release Activity: MFGa Release Description: WATER LANDFILL INCINER LAND/INCIN FUGITIVE Total Releases: 800.00 0.00 7300.00 0.00 0.00 (kg/yr) (kg/yr) (kg/yr) (kg/yr) (kg/yr) Release Days/yr: 4. 0. Per Site Release: 200.00 0.00 7300.00 0.00 0.00 (kg/day) (kg/yr) (kg/yr) (kg/yr) (kg/day) Remarks: Releases are to water or incineration. Water release is combination of 2 releases, assuming overlap (50+150 kg/site/day). Incineration re lease is combination of 2 releases (200+7100 kg/yr) and is below assessment threshold after assuming 99.9% destruction.

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 6.43E-02 Fish Ingestion Dose (mg/kg/day) Yes N/A 1.94E-02 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 **Exposure-based table developed without assuming overlap.

FATE TESTING RECOMMENDATIONS: On one or more of P-06-0263-4/6-7, first conduct ready biodeg test. Then if eco concernpersists, conduct activated sludge test (O ECD 303A). Testing should probably be done without the , which might confuse results because it is degradable.INITIAL REVIEW EXPOSURE REPORT -- CASE NUMBER: P060263c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 1 RELEASE ACTIVITY: MFGa 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 4. 200. 20.00 70.80

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) 203.12 1026.71 1735.66 2081.37 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) 1.74E-05 mg/kg/day 5.27E-06 mg/kg/day LADC pot(mg/L) 8.90E-04 mg/L 6.30E-02 mg/kg Chronic Non-Cancer ADD pot(mg/kg/day) 4.34E-05 mg/kg/day 1.32E-05 mg/kg/day ADC pot(mg/L) 2.23E-03 mg/L 0.16 mg/kg Acute ADR pot(mg/kg/day) 8.58E-02 mg/kg/day 2.58E-02 mg/kg/dayINITIAL REVIEW EXPOSURE REPORT CASE NUMBER: P060263c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 1 RELEASE ACTIVITY: MFGa 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 0.69 3 4 200.00 90.00INITIAL REVIEW EXPOSURE REPORT

Case Num ber: P060263c Assessor: Delpire ENVIRONMENTAL RELEASES Scenario#: 2 Number of Release Sites: 1. Release Activity: MFGb Release Description: WATER LANDFILL INCINER LAND/INCIN FUGITIVE Total Releases: 7050.00 0.00 0.00 0.00 0.00 (kg/yr) (kg/yr) (kg/yr) (kg/yr) (kg/yr) Release Days/yr: 47. 0. Per Site Release: 150.00 0.00 0.00 0.00 0.00 (kg/day) (kg/yr) (kg/yr) (kg/yr) (kg/day) Remarks:INITIAL REVIEW EXPOSURE REPORT --- CASE NUMBER: P060263c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 2 RELEASE ACTIVITY: MFGb 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 47. 150. 15.00 70.80

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) 152.34 770.03 1301.74 1561.03 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) 1.53E-04 mg/kg/day 4.64E-05 mg/kg/day LADC pot(mg/L) 7.85E-03 mg/L 0.56 mg/kg Chronic Non-Cancer ADD pot(mg/kg/day) 3.82E-04 mg/kg/day 1.16E-04 mg/kg/day ADC pot(mg/L) 1.96E-02 mg/L 1.39 mg/kg Acute ADR pot(mg/kg/day) 6.43E-02 mg/kg/day 1.94E-02 mg/kg/dayINITIAL REVIEW EXPOSURE REPORT CASE NUMBER: P060263c SITE-SPECIFIC HUMAN AND AQUATIC EXPOSURES TO SURFACE WATER RELEASES SCENARIO #: 2 RELEASE ACTIVITY: MFGb 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 7.31 27 47 150.00 90.00

REMARK: The concentration of concern (COC ) is exceeded 20 or more days per year.INITIAL REVIEW EXPOSURE REPORT

Case Num ber: P060263c Assessor: Delpire ENVIRONMENTAL RELEASES Scenario#: 3 Number of Release Sites: 50. Release Activity: USE Release Description: WATER LANDFILL INCINER LAND/INCIN FUGITIVE Total Releases: 0.00 0.00 1.00E+05 0.00 0.00 (kg/yr) (kg/yr) (kg/yr) (kg/yr) (kg/yr) Release Days/yr: 0. 0. Per Site Release: 0.00 0.00 2000.00 0.00 0.00 (kg/day) (kg/yr) (kg/yr) (kg/yr) (kg/day) Remarks: Incineration release is below assessment threshold after assuming 99.9% destruction.