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FIG. 6. Simulated carbon tetrachloride (CT) vapor plumes emanating from dense nonaqueous phase liquid disposed at the 216-Z-1A tile field and the 216-Z18 crib at Hanford. The "property value" legend reflects gaseous CT concentrations (g L–1) in the vadose zone. The stratigraphic units denote Backfill, Hanford 1a (h1a), Hanford 1 (h1), Hanford 2 (h2), Lower Gravel (low_grvl), Lower Sand (low_sand), Cold Creek silt (pplz), Cold Creek carbonate (pplc), upper Ringold (up_ring), Ringold E (ring_e), Ringold Lower Mud (low_rmud), Ringold A (ring_a), and Basalt.
