Practice

For a phosphorus TMDL on an impaired lake tributary, the loading capacity is the load that just meets the in-stream standard $C_{std}=5\,\text{mg/L}$ at a critical flow $Q=50\,\text{MGD}$ ($\text{load}=Q\cdot C\cdot8.34$ in lb/day). The nonpoint load allocation is $\Sigma LA=600\,\text{lb/day}$ and a margin of safety of 10% of the loading capacity is reserved. The allowable point-source waste-load allocation $\Sigma WLA$ is most nearly:

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