San Diego Bay is polluted due to leaching of hydrocarbons from old creosote pilings. If there are 25,000 pilings and each leaches 1kg per year, what is the steady-state hydrocarbon level expected in the Bay? Assume that San Diego Bay can be approximated by a CSTR of length 20km, width 2km, and depth 5m, and that bay-ocean tidal exchange is described by a tidal diffusivity of 400m²/s. Answer: 3.96 mg/m³

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