Chegg Guided Solutions for Introduction to Engineering and the Environment 1st Edition: Chapter 9

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    Total mass of PCBs in water

    = total water vol.× water column PCB conc.

    = [100 ft × 5 ft × 20 mi × (5280 ft/mi) × 28.32L/ft3] × [10 × 10-6 g/L × 10-3 kg/g]

    = 15 kg

    Total mass of PCBs in sediment

    = total sediment mass x sediment PCB conc.

    = total sediment vol. x sediment bulk density x sediment PCB conc.

    = [100 ft × 0.5 ft × 20 mi × (5280 ft/mi) × 0.02832 m3/ft3] × 2000 kg/m3 × 2 mg/kg

    = 5.98 × 108 mg

    = 598 kg

    Note: The bulk density of the sediment is the combined mass of water and solid particles in a unit volume of sediment, and is not equivalent to the density of the sediment particles alone. In solving this problem, a bulk density of 2000 kg/m3 has been assumed, which represents a bulk density for a mixture of sand, silt, clay, and water (see Table 9.2).

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