| Figure
4.4. |
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Copper (Cu) concentrations in sediment in parts
per million, dry weight (ppm) at 24 stations sampled
in February and August of 1997. * indicates
coarse sediment stations. Data is not shown for
a number of sites because the blanks were contaminated
(as indicated by B). b= blank contamination <10%
of measured concentration. Copper concentrations
ranged from 9.9 to 67.7 ppm The highest concentration
was sampled at Pinole Point (BD31) in February and
the lowest at Davis Point (BD41) in August. Average
concentrations were highest (60.0 ppm) in the Northern
Estuary in February and lowest (14.2 ppm) in the
Rivers in August. All stations had concentrations
below the ERM value of 270 ppm However, fifteen
stations in February and sixteen stations in August
had concentrations above the ERL value of 34 ppm.
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