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(cm) Averaging time. AT.w (years) Exposure duration57. ED.w (years) Exposure frequency57. EF.w (days/yr) Tier 1 defaults 0.370 0.16 0.21 0.333 0.037 300 5 305 240 200 25 25 250 Tier 2 values COC Source area width. Wg (cm) VFwamb (mg/m3/mg/L) Carcinogenic Noncarcinogenic MCL, MCL2 or EPA GWGWIng or . GWGWClass3 ................
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