| Figure
3.15. |
Total mercury (Hg) concentrations in water in
parts per billion (ppb) at 24 RMP stations sampled
in January, April, and August 1997. Note logarithmic
scale. 
= not detected. Concentrations ranged from not detected
to 0.13 ppb. The highest concentration was at Petaluma
River (BD15) in January. Average concentrations
were highest (0.098 ppb) in the Southern Sloughs
in January and lowest (0.003 ppb) in the Central
Bay in August. Twenty-two samples were above the
4-day average WQO for total mercury (saltwater 0.025
ppb, freshwater 0.025 ppb). |
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