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Evaluation Methods

Notes:

For the evaluation, we looked at both near field changes during construction activities where materials would actually be moved around the Bay or taken out of the Bay, and the distance from those activities is between 10 meters within near the construction activities to about a kilometer away. For the near field changes, we compared chemical concentrations from one hour averages to acute or short-term water quality objectives. And the short term objectives are objectives designed to protect against exposure from very short durations and immediate toxicity. For both the construction and the operation evaluation, we evaluated far field changes from 200 meters through the whole Bay, including the North Bay all the way through the South Bay. For those evaluations, we looked at four-day or 30-day average concentrations, depending on what the water quality objective has been written in, and we compared those to chronic or long-term water quality objectives, which are lower than the acute objectives.