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*400e *./ <br /> Table 1 <br /> SUMMARY OF TYPICAL METALS CONCENTRATIONS <br /> IN SOILS AND SURFICAL MATERIALS (') <br /> Metals Southbay Northbay San Francisco U,S. Mean <br /> Aluminum 7.0% 7.0% 10.0%+ 4.7% <br /> Lead 30-300ppm 30-300 ppm 30-300 ppm 16 ppm <br /> Calcium 1.8-2.8% 0.35-0.52% 1.8%-2.8% 0.92% <br /> Sodium 1.5-7% 1.5-7% 0.7% 0.59% <br /> Excerpts from the USGS Professional Paper 1270 for the conterminous United <br /> States <br />