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HEALTH AND HAZARD RISKS SUMMARY FILE, MW-10 INGESTION OF IRRIGATION WATER ingestion rate (ml/hr) 50 0 50 0 Exp Freq Irrigation (events/year) 150 150 . Exp Duration Groundwater (years) 6 00 30 0 Absorption Adjustment Factor for Ingestion of water (-) MTBE 1 0 1 0 INHALATION OF GW SPRAY width of sprinkler spray (m) 9 00 9 00 Height of Breathin zone (m) 2 00 2 00 Average windspeed [m/s) 2 25 2 25 Temperature of Irrigation water (C) 25 0 25 0 sprinkler Flow Rate (1/min) 50 0 50 0 Droplet Diameter sprinkler (cm) 0 200 0 200 Droplet Droptime for Sprinkler (s) 5 00 5 00 Time in sprinkler (hour/day) 2 60 2 00 Inhal Rate outdoors (mA3/hr) 0 830 0 830 Lung Retention Factor (-) 1 00 1 00 Exp Freq Irrigation (events/year) 150 150 Exp Duration Groundwater (years) 6 00 30 0 Absorption Adjustment Factor for inhalation (-) MTBE 10 10 Henry"s Law Constant (-) QBE 2 04E-02 2 04E-02 Molecular weight (g/mole) MTBE 88 88 DERMAL CONTACT WITH IRRIG WATER Total skin Surface Area (CMA2) 7 280E+03 2 300E+04 Fraction Skin Exposed to water ((-) 0 500 0 560 Time in Irrigation water (hour/da ) 2 60 2 00 Exp Freq Irrigation (events/year 150 150 Exp Duration Groundwater (years) 6 00 30 0 Dermal Permeability Coefficient (cm/hour) QBE 3 lOE-03 3 lOE-03 Absorption Adjustment 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 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 2 63E-03 9 52E-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 2 63E-03 2 53E-03 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 2 63E-03 9 52E-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 2 63E-03 2 53E-03 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 5 72E-04 5 72E-04 Concentration used to calculate hazard index Page 2