Kingston Ash Slide
Constituents of Potential Concern
The preliminary Ambient Air Monitoring Plan (AAMP) established early in recovery operations identified a large number of constituents for analysis in addition to particulate air concentrations (PM2.5 and PM10).
TVA performed bulk sampling of the ash containment area on December 31, 2008. These samples were analyzed for metals (Aluminum, Calcium, Lithium, Selenium, Vanadium, Antimony, Chromium, Magnesium, Silver, Zinc, Arsenic, Cobalt, Manganese, Strontium, Barium, Copper, Mercury, Thallium, Beryllium, Iron, Molybdenum, Tin, Cadmium, Lead, Nickel, and Titanium) and some volatile organic compounds. Volatile organic compounds were not detected in ash samples.
An analysis and recommendation of the appropriate analytes for continued investigation and reporting was conducted by the Center for Toxicology and Environmental Health, L.L.C., and used the rationale that any metal in ash below a typical background concentration for soil or which is below a USEPA residential soil regional screening level (RSL) would not pose an airborne concern. Only arsenic exceeded the criteria. Although the quartz concentrations of the ash are lower than those of natural soils, material safety data sheets (MSDS) of fly ash products nearly always include crystalline silica as a potential hazard. For this reason, TVA monitors for airborne quartz during remediation of the site.
Samples collected by any of the fixed instruments may be investigated for characterization of additional constituents of potential concern as they are identified. TDEC analyzes a TSP sample collected at Station 7 for Aluminum, Arsenic, Barium, Beryllium, Cadmium, Chromium, Lead, Manganese, Selenium, Thallium, Vanadium and Mercury.
The sample is collected on the 1/6 day cycle. TVA encourages other agencies participating in the ash recovery to share sampling plans. In most cases, TVA will sample for the same analytes using the same methods in order to provide independent confirmation of the results. As other agencies make changes to their sampling plans, changes may be warranted to the TVA plan.