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RISK AND HAZARD INPUT-OUTPUT SUMMARY, AREA I Exp. Freq. Indoor Air (events/yr) 350. 350. Exp. Duration Indoor Air (yr) 6.00 30.0 Absorption Adjustment Factor for Inhalation (--) . MTBE 1 0 1 0 MEDIA CONCENTRATIONS -------------------- Concentration in Groundwater (mg/L) obtained from Fate and Transport output AVERAGE Concentration (over exposure duration) (used to calculate carcinogenic risk) Exposure Duration (years) 6.0 30 MTBE 1.27E-11 1.27E-11 Concentration used to calculate hazard index (Averaged over 7 years or exposure duration, if less than 7 years) Exposure Duration (years) 6.0 7.0 MTBE 1 27E-11 1 27E-11 Conc. in Irrigation water (mg/L) - This will be the same as groundwater conc. obtained from Fate and Transport output AVERAGE Concentration (over exposure duration) (used to calculate carcinogenic risk) Exposure Duration (years) 6 0 30 MTBE 1.27E-11 1 27E-11 Concentration used to calculate hazard index (Averaged over 7 years or exposure duration, if less than 7 years) Exposure Duration (years) 6 0 7 0 MTBE 1.27E-11 1.27E-11 Concentration in Indoor Air (mg/mA3) Obtained from Fate and Transport output AVERAGE Concentration (over exposure duration) . (used to calculate carcinogenic risk) Exposure Duration (years) 6.0 30. MTBE 0.0 0.0 Concentration used to calculate hazard index (Averaged over 7 years or exposure duration, -if less than 7 years) Exposure Duration (years) 6.0 7 0 MTBE 0.0 0 0 SLOPE FACTORS AND REFERENCE DOSES --------------------------------- Ingestion slope Factor [1/(mg/kg-day)] MTBE 1 80E-03 1.80E-03 Ingestion Reference Dose (mg/kg-day) 0 86 0 86 Inhalation slope Factor [1/(mg/kg-day)] MTBE 9 10E-04 9 10E-04 Inhalation Reference Dose (mg/kg-day) MTBE 0 86 0.86 Dermal slope Factor [1/(mg/kg-day)] MTBE ND ND Dermal Reference Dose (mg/kg-day) MTBE ND ND SCENARIO. MMARY OF RESULTS -------1- ----2 Added INGESTION OF GROUNDWATER Page 3