. Bulletin. Science. 2 4 6 8 10 12 14 16 Ammonia (mg/L) 0 20 40 60 80 100 120 140 160 180 200 Total Copper (ug/L) C) â a ID C | o 80 % - 60 % - t/> I v> | E| (0 I / / / / / / i J ? f (D Si j / 3 cr LL 40 % - LL i 20 % - _^7j 2002 Fecal coliforms â 2003 E. Coli 0% - i i I D) 100% 80% 60 % - 40% 20 % - 0%. 10° 10' Iff 103 104 105 Iff 107 0 200 400 600 800 1000 Bacteria (MPN/100 ml_) Hardness (mg/L) Fig. 5. Distribution of observed storm drain water quality concentrations by year. NPS discharges was lower than that from small storm drains. The relative mass emission of trace metals varied
. Bulletin. Science. 2 4 6 8 10 12 14 16 Ammonia (mg/L) 0 20 40 60 80 100 120 140 160 180 200 Total Copper (ug/L) C) â a ID C | o 80 % - 60 % - t/> I v> | E| (0 I / / / / / / i J ? f (D Si j / 3 cr LL 40 % - LL i 20 % - _^7j 2002 Fecal coliforms â 2003 E. Coli 0% - i i I D) 100% 80% 60 % - 40% 20 % - 0%. 10° 10' Iff 103 104 105 Iff 107 0 200 400 600 800 1000 Bacteria (MPN/100 ml_) Hardness (mg/L) Fig. 5. Distribution of observed storm drain water quality concentrations by year. NPS discharges was lower than that from small storm drains. The relative mass emission of trace metals varied by source and by metal. In 2002, the large NPS discharges accounted for twice as much copper, iron, and lead relative to the small storm drains; in 2003, copper and iron emissions were higher in small storm drains than in the large NPS discharges. In both years, loadings of copper, lead, and nickel from the WRPs was minimal; however, the WRPs contributed the majority of zinc loading and between 12% and 51% of lead loading. Coyote Creek and the San Gabriel/San Jose Creek confluence area received the greatest mass loadings of pollutants of the four streams (Table 8). The large bacteria loading to Coyote Creek reflected the large storm drain volumetric inputs (Table 4). Large nutrient loadings in the SJC corresponded to large volumetric discharges from the San Jose WRP (214 X LO6 L d ' in 2002). Walnut Creek received no WRP input and had volumetric loadings less than half of the CC and SJC. Despite its low flow relative to other portions of the system, bacteria loadings. 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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