DDT, Chlordane, Toxaphene and PCB Residues in Newport Bay and Watershed: Assessment of Hazard to Wildlife and Human Health - Reviews of Environmental Contamination and Toxicology - page 147

for the full red shiner dataset (1983-2001) is equivalent to a half-life of 3.4 years for
toxaphene in the watershed.
Mussel tissue data from Newport Bay for the period 1980 through 2000 do not
show any statistically signifi cant trends in wet weight toxaphene concentrations
over time (Fig. 31 ). However, toxaphene concentrations in 84 out of the 111
samples (76%) collected over the 21-year period were below analytical detection
limits, and the frequency of non-detect results was consistent over time. Nondetect
samples were not plotted in Fig. 31 .

600

500

400

300

200

100

0

Date

Red Shiner (1993-2001) Expon. (Red Shiner (1993-2001))

Fig. 30 Toxaphene concentrations in red shiner, San Diego Creek and Peters Canyon Wash, pro-
jected through 2015. Data from California Toxic Substances Monitoring Program ( 1983 -2002).
Red shiner data from 2002 to the present are not available

300

250

200

150

100

50

0

Jan-1979 Jan-1984 Jan-1989 Jan-1994 Jan-1999 Jan-2004

Date

Fig. 31 Toxaphene concentrations in mussels from Newport Bay and Watershed. Data from the
California Mussel Watch Program ( 1980 -2000). Only data above detection limits were plotted.
The Mussel Watch Program ended in 2000