  |
|
|
|
|
| Title | Re-Evaluation of Copper Impact from Wilkeson Wastewater Treatment Plant on Wilkeson Creek. | |||
| Month-Year Published | May 2001 | |||
| Online Availability |
371 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
| |||
| Short Description |
Wilkeson Creek, a tributary to the Carbon River in Pierce County, is on the 1998 303(d) list for exceeding state aquatic life standards for copper. The listing is based on a copper concentration of 37 ug/L measured in a composite effluent sample from Wilkeson Wastewater Treatment Plant (WWTP), collected in November 1995. This re-evaluation is a more intensive study of copper in the WWTP effluent and receiving water. Eight sampling events from July through November 2000 provided data on copper concentrations, general water quality chemistry, and flow for the WWTP effluent and for Wilkeson Creek above and below the outfall. (Also see abstract below) | |||
| Publication Number | 01-03-021 | |||
| Author(s) | Golding, S. and A. Johnson | |||
| Print Availability | ||||
| Number of pages | 13 pp. + app (31 total) | |||
| Keywords | copper, county, creek, evaluation, flow, plan, river, study, treatment, waste, wastewater, wastewater treatment plant, water, water quality | |||
| Subject Waterbodies |
| |||
| Abstract | Long Description |
Wilkeson Creek, a tributary to the Carbon River in Pierce County, is on the 1998 303(d) list for exceeding state aquatic life standards for copper. The listing is based on a copper concentration of 37 ug/L measured in a composite effluent sample from Wilkeson Wastewater Treatment Plant (WWTP), collected in November 1995. This re-evaluation is a more intensive study of copper in the WWTP effluent and receiving water. Eight sampling events from July through November 2000 provided data on copper concentrations, general water quality chemistry, and flow for the WWTP effluent and for Wilkeson Creek above and below the outfall. Copper concentrations upstream and downstream of the WWTP outfall were well within water quality standards during each of the eight sampling events. The maximum dissolved copper concentration found downstream of the outfall was 0.78 ug/L. The maximum total recoverable copper concentration found in the WWTP effluent was 36.4 ug/L. An analysis with a water quality standards spreadsheet developed by Ecology′s Water Quality Program, TSDCALC 9, showed there was no reasonable potential for copper concentrations to exceed water quality standards for critical low-flow conditions or for any of the sampling event conditions. Based on the findings of this study, it is recommended that Wilkeson Creek (WA-10-1087, ID # NX07HW, Township 19N, Range 06E, Section 28) be removed from the 303(d) list for copper, and that no limit for copper be included in the Wilkeson Creek WWTP permit. |
||
Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.html.
