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| Title | Spokane Area Point Source PCB Survey, May 2001 | |||
| Month-Year Published | March 2002 | |||
| Online Availability |
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| Short Description |
Samples from four dischargers to the Spokane River and one waste contributor to a wastewater treatment plant (WWTP) were analyzed for polychlorinated biphenyls (PCBs) and associated general chemistry parameters during May 2001: | |||
| Publication Number | 02-03-009 | |||
| Author(s) | Golding, S. | |||
| Print Availability | ||||
| Number of pages | 94 pp. | |||
| Keywords | aluminum, industrial, lake, plan, point source, river, samples, Spokane River, survey, waste | |||
| Subject Waterbodies |
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| Abstract | Long Description |
Samples from four dischargers to the Spokane River and one waste contributor to a wastewater treatment plant (WWTP) were analyzed for polychlorinated biphenyls (PCBs) and associated general chemistry parameters during May 2001: A recently developed low-level method was used to analyze PCBs in all 209 possible congener forms in 159 groupings at practical quantitation limits, ranging from 76 pg/L to <1 pg/L. PCBs were also analyzed as Aroclor-equivalents in sludge samples from two of the facilities. Samples from Spokane Industrial Park wastewater were found to have the highest concentrations of total PCBs (8,240 pg/L). Spokane Industrial Park contributes wastewater to the Spokane WWTP. Of the four facilities discharging directly to the Spokane River, Kaiser Trentwood was found to have the highest total PCB concentration (7,670 pg/L). Inland Empire Paper, Spokane WWTP, and Liberty Lake WWTP samples were found to have total PCB concentrations of 2,440 pg/L, 1,790 pg/L, and 1,730 pg/L, respectively. These total concentrations are means of two grab samples collected on two consecutive days, with the exception of Inland Empire Paper for which a single grab sample was collected. Because total PCB concentrations were calculated by summing congeners, some of which were estimated values, they should be considered estimates. Estimated loadings of total PCBs to the Spokane River during the survey were highest from Kaiser Trentwood and the Spokane WWTP (means of 0.48 g/day and 0.26 g/day, respectively). The estimated Kaiser loadings exceeded the combined loadings of all other sources monitored. Total PCBs in the Kaiser effluent were lower in these survey samples than in samples collected in 1994 and 1995. Kaiser′s efforts in recent years to clean up facility-related PCBs, and their use of a polymer flocculant during the survey sampling period, may have reduced PCB concentrations in the effluent. |
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