Near Field Receiving Water Monitoring of Trace Metals in Clams (Macoma balthica) and Sediments Near the Palo Alto Water Quality Control Plant in South San Francisco Bay, California: 2002

This report presents trace element concentrations analyzed on samples of fine-grained sediments and clams (Macoma balthica) collected from a mudflat one kilometer south of the discharge of the Palo Alto Regional Water Quality Control Plant in South San Francisco Bay. This report serves as a continua...

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Bibliographic Details
Main Authors: Moon, Edward, Primo, Carlos, David, C, Luoma, Samuel N, Cain, Daniel J, Hornberger, Michelle I, Lavigne, Irene R
Format: Report
Language:English
Subjects:
CALIFORNIA
CLAMS
CONCENTRATION(CHEMISTRY)
CONCENTRATION(COMPOSITION)
COPPER
FINE GRAINED MATERIALS
Hydrology, Limnology and Potamology
MERCURY
METAL COMPOUNDS
MONITORING
NEAR FIELD
SAMPLING
SAN FRANCISCO BAY
SEASONAL VARIATIONS
SEDIMENTS
TISSUES(BIOLOGY)
TRACE ELEMENTS
Water Pollution and Control
WATER QUALITY
ZINC
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Description
Summary:This report presents trace element concentrations analyzed on samples of fine-grained sediments and clams (Macoma balthica) collected from a mudflat one kilometer south of the discharge of the Palo Alto Regional Water Quality Control Plant in South San Francisco Bay. This report serves as a continuation of the Near Field Receiving Water Monitoring Study, which was started in 1994. The data for 2002, herein, are interpreted within that context. Metal concentrations in both sediments and clam tissue samples have been within the range of values produced by seasonal variability. However, copper and zinc, display continued decreases. Copper in sediment was observed to drop below the ERL (Effects Range-Low) concentration for the third consecutive year and zinc concentrations never exceeded the ERL. Yearly average concentrations of copper, zinc and silver in Macoma balthica for 2002 are some of the lowest recorded since monitoring began in 1975. Mercury and selenium concentrations in sediments and clams at Palo Alto were similar concentrations observed elsewhere in the San Francisco Bay. Prepared in cooperation with the City of Palo Alto, California.