. Bulletin. Science. 12 10 8 6 4 2 Stream Distance (km) D). 12 10 8 6 4 2 0 Stream Distance (km) Fig. 8. locations). In-stream Enterococcus concentrations by stream and year (vertical arrows show WRP In Figure 8b, 0 km is the confluence of San Jose Creek and the San Gabriel River. in the SGR were comparable to those observed in Ballona Creek, where detection limits were similar to those used in the SGR. The manner in which samples with nondetectable levels of a particular metal were treated may affect conclusions regarding distribution of load among sources. The degree that nondetectable value
. Bulletin. Science. 12 10 8 6 4 2 Stream Distance (km) D). 12 10 8 6 4 2 0 Stream Distance (km) Fig. 8. locations). In-stream Enterococcus concentrations by stream and year (vertical arrows show WRP In Figure 8b, 0 km is the confluence of San Jose Creek and the San Gabriel River. in the SGR were comparable to those observed in Ballona Creek, where detection limits were similar to those used in the SGR. The manner in which samples with nondetectable levels of a particular metal were treated may affect conclusions regarding distribution of load among sources. The degree that nondetectable values influence general conclusions about loading depends on the frequency of nondetectable values. In our analyses, we assumed that samples below the detection limit had a concentration of zero. Due to the large volume input by the WRPs, small differences in these estimates can have a dramatic effect on the overall distribution of trace metal sources (Figure 10). For example, assuming that nondetectable samples for nickel were equal to a concen- tration of zero led to an estimation that storm drains account for 100% of the nickel mass. If this assumption were changed to a concentration equal to one-half. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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