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HEALTH AND HAZARD RISKS SUMMARY FILE Exp Freq Irrigation (events/year) 150. 150 Exp Duration Groundwater (years) 6 00 30 0 Dermal Permeability Coefficient (cm/hour) MTBE 3 10E-03 3 10E-03 Absorption Ad3ustment Factor for Dermal Exposure to water (-) MTBE 1 0 1 0 INHALATION OF INDOOR AIR Inhalation rate (mA3/hr) 0 625 0.830 Time indoors (hours/day) 24 0 24 0 Lung Retention Factor (-) 1.00 1 00 Exp. Freq Indoor Air (events/yr) 350. 350 Exp Duration Indoor Air (yr) 6 00 30 0 Absorption Ad3ustment 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 3 83E-14 1 82E-14 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 3.83E-14 3 75E-14 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 3 83E-14 1 82E-14 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 3 83E-14 3.75E-14 concentration 7n Indoor Air (mg/mA3) obtained from Fate and Transport output AVERAGE Concentration (aver exposure duration) (used to calculate carcinogenic risk) Exposure Duration (years) 6 0 30 MTBE 5 72E-04 5 72E-04 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 5.72E-04 5.72E-04 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) MTBE 0 86 0 86 Page 3