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| Title | American Plating Post-Interim-Action Groundwater Monitoring Results, March and August 2005 | |||
| Month-Year Published | January 2006 | |||
| Online Availability |
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| Short Description |
During March and August 2005, groundwater samples for dissolved cadmium, chromium, copper, and nickel, WAD cyanide, and volatile organics were collected from the former American Plating site in Tacoma. Nickel did not meet (exceeded) the groundwater cleanup level of 8.2 ug/L in two wells at concentrations of 9.2 to 40.3 ug/L. Copper slightly exceeded the cleanup level of 3.1 ug/L in one well. Chromium concentrations ranged from 9 to 88 ug/L. Hexavalent chromium and WAD cyanide were not detected in any of the wells. Several volatile organics were detected in one well, but at concentrations near or below the reporting limit. (Also see abstract below) | |||
| Publication Number | 06-03-005 | |||
| Author(s) | Marti, P. | |||
| Print Availability | ||||
| Number of pages | 18 pp. | |||
| Keywords | chromium, cleanup, copper, groundwater, monitoring, results, toxics, water, waterway, wells | |||
| Subject Waterbodies |
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| Related Publications | Title | Relationship | ||
| American Plating Post-Interim-Action Groundwater Monitoring Results, February and August 2004 | similar topic | |||
| Quality Assurance Project Plan: American Plating Post-Interim Action Monitoring | similar topic | |||
| American Plating Post-Interim-Action Groundwater Monitoring Results, May and September, 2006 | part of a series | |||
| American Plating Post-Interim-Action Groundwater Monitoring Results, April and September, 2007 | part of a series | |||
| Abstract | Long Description |
Groundwater samples for select dissolved metals (cadmium, chromium, hexavalent chromium, copper, and nickel), weak acid dissociable cyanide, and volatile organic compounds were collected from five monitoring wells during March and August, 2005, at the former American Plating site located on the Thea Foss Waterway in Tacoma, Washington. Samples were collected to provide the Department of Ecology′s Toxics Cleanup Program with post-interim-action groundwater monitoring data. Dissolved cadmium, chromium, copper, and nickel were detected in groundwater at the site during March and August.
In 2004, dissolved chromium concentrations exceeded Washington State surface water quality standards for protection of aquatic organisms in marine waters for acute exposure to hexavalent chromium of 50 ug/L. Since it was not possible to determine which form of chromium, trivalent or hexavalent, was present, samples were collected and analyzed for hexavalent chromium in August 2005. Dissolved hexavalent chromium was not detected in any of the samples. Therefore, it is assumed that the less toxic and immobile trivalent chromium was present. Because dissolved nickel exceeded the established groundwater cleanup standard during both monitoring rounds, some level of groundwater monitoring should continue. |
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