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| Title | 1998 Sediment Trap Monitoring of Suspended Particulates in Stormwater Discharges (Thea Foss) | |||
| Month-Year Published | December 1998 | |||
| Online Availability |
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| Short Description |
In-line sediment traps were deployed between December 1997 and April 1998 in several stormwater discharges to Thea Foss Waterway, located in Commencement Bay, Tacoma, Washington. The primary objective of this investigation was to determine contaminant concentrations associated with suspended particulate matter (SPM) entering the waterway. These data were obtained to supplement and compare to monitoring results collected in 1997. The overall goal of the project is to evaluate source control efforts and determine the potential for recontamination of bottom sediments in Thea Foss Waterway. (Also see abstract below) | |||
| Publication Number | 98-336 | |||
| Author(s) | Norton, D. | |||
| Print Availability | ||||
| Number of pages | 10 pp. + app. (128 total) | |||
| Keywords | basin, chemical, contaminant, discharge, hydrocarbons, marina, mercury, monitoring, objectives, PAHs, particulate matter, sediment, Stormwater, water, zinc | |||
| Subject Waterbodies |
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| Abstract | Long Description |
In-line sediment traps were deployed between December 1997 and April 1998 in several stormwater discharges to Thea Foss Waterway, located in Commencement Bay, Tacoma, Washington. The primary objective of this investigation was to determine contaminant concentrations associated with suspended particulate matter (SPM) entering the waterway. These data were obtained to supplement and compare to monitoring results collected in 1997. The overall goal of the project is to evaluate source control efforts and determine the potential for recontamination of bottom sediments in Thea Foss Waterway. The data collected indicated that concentrations of 28 individual chemicals exceeded the Commencement Bay Sediment Quality Objectives (SQOs) in SPM. The majority of SQO violations were for polynuclear aromatic hydrocarbons (PAHs) and phthalates. The greatest number of SQO violations (22) were measured in the 15th Street drain (230), which discharges to the central portion of the waterway. High concentrations of mercury, zinc, and tributyltin were also measured in a catch basin adjacent to the Picks Cove Marina. Comparisons of data from 1997 and 1998 indicated that low molecular weight PAH (LPAH) and high molecular weight PAH (HPAH) levels were similar in both years with the exception of the 15th street drain. Both LPAH and HPAH concentrations appear to be higher in 1998, at this location. For bis(2-ethyl hexyl) phthalate slightly higher levels were measured in 1998 in the Nalley Valley and 15th street discharges. Pentachlorophenol and 4-methyl phenol levels were substantially higher in 1998 compared to 1997 in the three major discharges to the waterway. |
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