| Figure
3.12. |
|
Dissolved lead (Pb) concentrations in water in
parts per billion (ppb) at 24 RMP stations sampled
in January and April 1997. Data for August 1997
were not available at the time of report production.
Note logarithmic scale. Concentrations for January
and April 1997 ranged from 0.002 to 0.98 ppb. The
highest concentration was sampled at Petaluma River
(BD15) in January, and the lowest was sampled at
San Pablo Bay (BD20) in April. Average concentrations
were highest (0.41 ppb) in the Rivers in January
and lowest (0.01 ppb) in the Central Bay in April.
All samples were below the 4-day average WQC for
dissolved lead (saltwater 8.1 ppb, freshwater--hardness
dependent). |
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