U.S.
GEOLOGICAL SURVEY
Open-File
Report 02-453
APPENDIX for
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: 1999-2001
Appendix 1. Raw data for sediment analyses
Metal concentrations determined by ICP-OES in sediments collected at the Palo Alto mudflat. Each monthly collection is
reported on a separate page. Concentrations observed in the reconstituted samples or extracts (in micrograms per milliliter
or ug/ml) are reported at the top of each page, along with the sediment weight and dilution factor. The latter are employed
to determine concentrations in sediments (reported as microgram per gram dry sediment or ug/g). Replicate subsamples
were analyzed from each collection. Mean and standard deviation for the replicate samples are reported for the total and
hydrochloric acid extracts. Samples that were below detection limit are denoted as "bd".
Grain size data (p. 46) as well as TOC analyses (p. 47) and concentrations of Hg and Se in surface sediments (p. 63) are
reported in separate summary tables.
Grain size data (1994-2001) (PDF, 55 KB)
Carbon and Nitrogen analyses (2000-2001) (PDF, 51 KB)
Heavy metal concentrations in sediments (1999) (PDF, 71 KB)
Heavy metal concentrations in sediments (2000) (PDF, 71 KB)
Heavy metal concentrations in sediments (2001) (PDF, 69 KB)
Mercury and Selenium concentrations in sediments
(1999-2001) (PDF, 63 KB)
Appendix 2. Raw data for tissue analyses (Macoma balthica)
Metal concentrations in the clam Macoma balthica collected at the Palo Alto Mudflat. Each monthly collection is reported
on two pages. The first page contains summary statistics:
Mean concentrations in microgram per gram dry tissue weight (ug/g).
STD is the standard deviation of the mean.
SEM is the standard error of the mean.
CV percent is the coefficient of variation.
r wt x [] is the correlation coefficient for the concentration versus weight correlation for each element.
X 100mg is the concentration interpolated from the above regression for a 100 mg animal.
r l x [] is the correlation coefficient for the concentration versus shell length regression.
X 20 mm and X 25 mm are concentrations interpolated from the regression for 20mm and 25 mm animals.
Content (a measure of metal bioaccumulation that is independent of mass) is also shown for 20 and 25 mm animals, as is the weight determined for animals of 15 mm and 20 mm shell length.
The second page for each month shows the analysis of each composite sample, the number of animals composited in each, concentration as calculated from sample dry weight, the dilution factor and the metal content for each sample.
Mercury concentrations in clams (1999-2001) (PDF, 69 KB)
Selenium concentrations in clams (1999-2001) (PDF, 64 KB)
Metal concentrations in clams (1999) (PDF, 64 KB)
Metal concentrations in clams (2000) (PDF, 64 KB)
Metal concentrations in clams
(2001) (PDF, 64 KB)
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Send questions or comments about this report to Stacey Andrews (sandrews@usgs.gov) (650) 329-4468
For more information about USGS activities concerning Ecology and Contaminants in San Francisco Bay, visit the USGS Ecology and Contaminants Website.
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