Publication Summary

To examine concentrations and distribution of priority pollutants that discharge through the storm drain system into Sinclair and Dyes Inlet, sediments, water, and particulate centrifuged from stormwater were collected from storm drain systems. This study was designed to trace pollutants, found in an earlier phase, to small, identifiable sections of storm drain systems. Additionally, outfalls that were not previously checked were examined in this second phase of study. A total of 13 sites were examined: two outfall areas from Port Orchard, three outfall areas from Silverdale, and eight storm drain sites in Bremerton.

To examine concentrations and distribution of priority pollutants that discharge through the storm drain system into Sinclair and Dyes Inlet, sediments, water, and particulate centrifuged from stormwater were collected from storm drain systems. This study was designed to trace pollutants, found in an earlier phase, to small, identifiable sections of storm drain systems. Additionally, outfalls that were not previously checked were examined in this second phase of study. A total of 13 sites were examined: two outfall areas from Port Orchard, three outfall areas from Silverdale, and eight storm drain sites in Bremerton.

Most sites had detectable levels of 4-methylphenol, phenol, and different phthalates; only the Port Orchard sites had no detectable concentrations of these chemicals. The Bremerton sites exceeded several state marine sediment and water quality standards for pentachlorophenol, PCBs, PAHs, mercury, lead and zinc. Potential sources of pollutants found in Phase 1 in three storm drain basins were narrowed to within one city block in this study. Pollutants in suspended particulate were measured and gave an indication of the levels of contaminants that enter the Puget Sound Naval Shipyard in Bremerton and eventually discharge into Puget Sound. Storm water samples showed metals contamination in less industrialized areas.