1. Dental Amalgam Dennis Bowhay HWTR Program Ecology (360) 407-6881 or (509) 454 -7866

2. Mercury Dental Amalgam Approx 50% mercury (silver copper tin) Approx 50% mercury (silver copper tin) 450 mg per restoration (25% unused) 450 mg per restoration (25% unused) 711 placements per year 711 placements per year

3. Scrap Amalgam

4. Trap Amalgam

5. Vacuum Pump Filter Amalgam

6. Quantity of Amalgam Waste 34 ounces scrap amalgam per month 34 ounces scrap amalgam per month No estimate for Trap waste No estimate for Trap waste No estimate for Vacuum filter waste No estimate for Vacuum filter waste

7. Designation of Amalgam Wastes Scrap Amalgam failed TCLP nearly all of the time Scrap Amalgam failed TCLP nearly all of the time Trap Amalgam failed TCLP about half of the time Trap Amalgam failed TCLP about half of the time Vacuum Filter Amalgam failed in one sample Vacuum Filter Amalgam failed in one sample

8. Conclusion Amalgam Wastes must be designated by testing unless recycled or disposed of as MRW Amalgam Wastes must be designated by testing unless recycled or disposed of as MRW

9. Sources of Amalgam Scrap Amalgam Scrap Amalgam Contact and Non-contact Contact and Non-contact Trap Amalgam Trap Amalgam Vacuum Pump Filter Amalgam Vacuum Pump Filter Amalgam

10. Information Sources “Management of hazardous dental wastes in King County, 1991-2000”, Hazardous Waste Management Program, October 5, 2000 “Management of hazardous dental wastes in King County, 1991-2000”, Hazardous Waste Management Program, October 5, 2000 “Mercury in King County”, The Local Hazardous Waste Management Program in King County, November 2002 “Mercury in King County”, The Local Hazardous Waste Management Program in King County, November 2002