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Final Report of the 1999-2000 Vashon-Maury Island Soil Study

This report is an examination of soil contamination with arsenic, lead, and other metals in the area downwind from the former Tacoma copper smelter.

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List of Tables


Table 1 Field duplicate sample results
Table 2 Field equipment rinsate samples: Lead results
Table 3 Components of data evaluation data set
Table 4a Arsenic concentration percentiles by sampling zone (all data)
Table 4b Lead concentration percentiles by sampling zone (all data)
Table 4c Cadmium concentration percentiles by sampling zone (all data)
Table 5 Arsenic, lead, and cadmium concentration percentiles by sampling zone (maximum location values)
Table 6 Summary of depth profile patterns for arsenic and lead by sampling zone
Table 7a Summary of spatial scale variability by sampling zone: K-factors
Table 7b Summary of spatial scale variability by sampling zone: Standard deviations

List of Figures


Note: Except for Figures 7 and 8, all figures below are only available by request.

Fig. 1 Vashon-Maury Island Sampling Sites
Fig. 2 Lognormal Probability Plot: Arsenic (All Data)
Fig. 3 Lognormal Probability Plot: Lead (All Data)
Fig. 4 Frequency Histogram: Arsenic (All Data)
Fig. 5 Frequency Histogram: Lead (All Data)
Fig. 6 Frequency Histogram: Cadmium (All Data)
Fig. 7 Arsenic Levels at Vashon-Maury Island Sampling Sites
Fig. 8 Lead Levels at Vashon-Maury Island Sampling Sites
Fig. 9 Box-and-Whisker Plot: Arsenic Data by Sampling Zone
Fig. 10 Box-and-Whisker Plot: Lead Data by Sampling Zone
Fig. 11 Box-and-Whisker Plot: Cadmium Data by Sampling Zone
Fig. 12 Scatterplot: Lead versus Arsenic Concentrations (All Data)
Fig. 13 Regression: Lead versus Arsenic Concentrations (LOG-LOG linear model, All Data)
Fig. 14 Scatterplot: Lead versus Arsenic Concentrations (Maximum Location Values)
Fig. 15 Regression: Lead versus Arsenic Concentrations (LOG-LOG linear model, Maximum Location Values)
Fig. 16 Scatterplot: Cadmium versus Arsenic Concentrations (All Data)
Fig. 17 Scatterplot: Cadmium versus Arsenic Concentrations (Maximum Location Values)
Fig. 18 Scatterplot: Cadmium versus Lead Concentrations (All Data)
Fig. 19 Scatterplot: Cadmium versus Lead Concentrations (Maximum Location Values)
Fig. 20 Arsenic Depth Profile Summary (All Data)
Fig. 21 Lead Depth Profile Summary (All Data)
Fig. 22 Cadmium Depth Profile Summary (Detected Values Only)
Fig. 23 Box-and-Whisker Plot: Arsenic Depth Profile Ratios, T/S, by Sampling Zone
Fig. 24 Frequency Histogram: Arsenic Depth Profile Ratios, T/S (All Data)
Fig. 25 Frequency Histogram: Lead Depth Profile Ratios, T/S (All Data)
Fig. 26 Comparative Depth Profile Ratios, S/T: Lead versus Arsenic
Fig. 27 Frequency Histogram: Comparative Depth Ratios, S/T, Lead versus Arsenic
Fig. 28 Comparative Depth Profile Ratios, S/T: Cadmium versus Arsenic
Fig. 29 Comparative Depth Profile Ratios, S/T: Cadmium versus Lead
Fig. 30 Box-and-Whisker Plot: Arsenic K-Factors versus Distance
Fig. 31 Box-and-Whisker Plot: Arsenic Standard Deviations versus Distance
Fig. 32 Box-and-Whisker Plot: Lead K-Factors versus Distance
Fig. 33 Box-and-Whisker Plot: Lead Standard Deviations versus Distance
Fig. 34 Scatterplot: Arsenic K-Factors versus Magnitude of Contamination
Fig. 35 Scatterplot: Arsenic Standard Deviations versus Magnitude of Contamination

List of Attachments


Att. A Access Agreement Form
Att. B Laboratory Results, Soil Analyses for Arsenic, Lead, and Cadmium
Att. C Data Validation Report: Summary, Inorganic Data Assessment (Available upon request only)
Att. D Additional Statistical Evaluations and Data Plots (Available upon request only)