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RISK AND HAZARD INPUT-OUTPUT SUMMARY, AREA II Time indoors (hours/day) 24 0 24 0 Lung Retention Factor (-) 1 00 1 00 Exp Freq Indoor Air (events/yr) 360. 350 Exp. Duration indoor Air (yr) 6 00 30 0 Absorption Adjustment Factor for Inhalation (-) MTBE 1 0 1 0 MEDIA CONCENTRATIONS - Concentrationin 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 7 40E-11 7 40E-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 7 40E-11 7.40E-11 Conc in Irrigation water (mg/L) - This will be the same as groundwater cont. Obtained from Fate and Transport output AVERAGE Concentration (over exposure duration) (used to calculate carcinogenic risk) Exposure Duration (years) 6 0 30 MTBE 7 40E-11 7.40E-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 7.40E-11 7 40E-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) MTBE 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) KTBE ND ND • SCENARIO' SUMMARY OF RESULTS 1 2 Added ----------------------------------------------------------------------- Page 3