Initial Mixing Zone

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Notes:

For evaluation of direct toxicity, we calculated the size of the initial mixing zone based on the dredging guidance. This is the zone in which some dilution would be expected to occur. And according to the guidance, effects would be expected to occur within this zone, but should be avoided outside the zone. So this figure shows the approximate area of the mixing zone around the SFO platform and also the East Bay Shoals borrow site. The approximate size we calculated was about a third of a square mile. The shape and location of the plume is going to change. This is likely to be more elongated, depending on the tidal cycles.