| Figure
3.8. |
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Dissolved chromium (Cr) concentrations in water
in parts per billion (ppb) at 24 RMP stations sampled
in January, April, and August 1997. Note logarithmic
scale. Concentrations ranged from 0.1 to 8.8 ppb.
The highest concentration was sampled at Petaluma
River (BD15) in January and the lowest at Richardson
Bay (BC30) in August. Average concentrations were
highest (4.2 ppb) in the Northern Estuary in January
and lowest (0.1 ppb) in the Central Bay in August.
All samples were below the 4-day average WQC for
dissolved chromium (saltwater 50 ppb, freshwater
11 ppb). |
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