The purpose of this report is to review data collected during two phases of extended footprint studies of the Tacoma Smelter Plume Project, including studies on Vashon-Maury Island, Mainland King County, and Pierce County. The report summarizes and evaluates analytical data, including the magnitude and spatial patterns of elevated soils levels of arsenic and lead caused by air deposition from the Asarco smelter.

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	Executive Summary and report findings
	TABLES:
	Table 1:	Sample Collection Summary
	Table 2:	Average Relative Percent Difference Between Duplicate Samples by County
	Table 3:	Arsenic Detections
	Table 4:	Summary of Arsenic Concentration Data
	Table 5:	Detections above Cleanup Levels and Background Concentrations
	Table 6:	Lead Detections
	Table 7:	Summary of Lead Concentration Data
	Table 8:	Cadmium Detections
	Table 9:	Summary of Cadmium Concentration Data
	Table 10:	Selected Lead and Arsenic Correlation Statistics
	FIGURES:
	Figure 1:	Study Areas
	Figure 2:	Graphical Representation of Project Components
	Figure 3:	Number of Sample Locations Used in Polygon Statistics
	Figure 4:	Arsenic Concentrations In Soil, 90th Percentile, 0-2 inches
	Figure 5:	Arsenic Concentrations In Soil, 90th Percentile, 0-6 inches
	Figure 6:	Arsenic Concentrations In Soil, Median, 0-2 inches
	Figure 7:	Arsenic Concentrations In Soil, Median, 0-6 inches
	Figure 8:	Arsenic Distribution: North
	Figure 9:	Arsenic Distribution: North-Northwest
	Figure 10:	Arsenic Distribution: Northwest
	Figure 11:	Arsenic Distribution: West-Northwest
	Figure 12:	Arsenic Distribution: West
	Figure 13:	Arsenic Distribution: West-Southwest
	Figure 14:	Arsenic Distribution: Southwest
	Figure 15:	Arsenic Distribution: South-Southwest
	Figure 16:	Arsenic Distribution: South
	Figure 17:	Arsenic Distribution: South-Southeast
	Figure 18:	Arsenic Distribution: Southeast
	Figure 19:	Arsenic Distribution: East-Southeast
	Figure 20:	Arsenic Distribution: East
	Figure 21:	Arsenic Distribution: East-Northeast
	Figure 22:	Arsenic Distribution: Northeast
	Figure 23:	Arsenic Distribution: North-Northeast
	Figure 24:	Arsenic vs. Lead: King County
	Figure 25:	Arsenic vs. Lead: Kitsap County
	Figure 26:	Arsenic vs. Lead: Pierce County
	Figure 27:	Arsenic vs. Lead: Thurston County
	Figure 28:	Arsenic Depth Profile Summary: King County
	Figure 29:	Arsenic Depth Profile Summary: Kitsap County
	Figure 30:	Arsenic Depth Profile Summary: Pierce County
	Figure 31:	Arsenic Depth Profile Summary: Thurston County
	Figure 32:	Lead Depth Profile Summary: King County
	Figure 33:	Lead Depth Profile Summary: Kitsap County
	Figure 34:	Lead Depth Profile Summary: Pierce County
	Figure 35:	Lead Depth Profile Summary: Thurston County
	Figure 36:	Histogram of Arsenic Depth Profile Ratios
	Figure 37:	Histogram of Lead Depth Profile Ratios
	APPENDICES:
	Appendix A:	90th Percentile Calculation Method
	Appendix B:	Concentration Maps, King County
	Appendix C:	Concentration Maps, Kitsap County
	Appendix D:	Concentration Maps, Pierce County
	Appendix E:	Concentration Maps, Thurston County
	Appendix F:	Cleanup Level Extrapolation
	Appendix G:	Maximum Concentration Maps Produced By Ecology