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tl!^AT ; • .�hl ]C0 <br /> • <br /> April 28, 1992 <br /> Updated <br /> Metals Southbay Northbay S.F. U.S. Mean Notes <br /> Potassium I.69w 2% 1.170 1.5% <br /> Rubidium - <20-45 <20-45 58 <br /> Scandium 15-40 15-40 15-40 7.5 <br /> Selenium *+S 0.5 0.5 _ 0.1 0.26 1 - <br /> Silicon - 27% 35% 31% <br /> Silver *+S - - - - 1, 2 <br /> Sodium 1.5-770 1.5-7% 0.7% 0.59% <br /> Strontium 150 70-100 200-300 120 <br /> Sulfur - 800 800 1200 <br /> Thallium *+ _ _ - - 1. 2 <br /> Thorium - 2.6-6.7 2.6-6.7 8.6 <br /> Tin - 2-7 2-7 0.89 <br /> Titanium 0.3% 0.2% 0.5-1.5% 0.24% <br /> Uranium - 2.8 0.35-2.0 2.3 <br /> Vanadium+ 150-500 150-500 150-500 58 1 <br /> Ytterbium 3 5 3 2.6 <br /> Yttrium 30 30 20 21 <br /> Zinc *+ 120-510 120-510 120-510 48 1 <br /> Zirconium <20-100 200 <20-100 180 <br /> . . <br /> 1. One of 13 Priority PollutantL.,1111atals (a) <br /> One of 17 EPA Method 6010x000 Metals (+) <br /> 8..r m-_ �iit y k r=-L Pj 1.11..x..1.. /Q\ <br /> One or a nr luaiu�y �i�..a.r/ 1.iol.a.o �.o� <br /> 2. Not listed in U.S.G.S. Paper 1270 <br /> 3. U.S. Mean is a geometric mean value <br /> shown for comparison purposes only <br /> 4. Data Source - Shacklette, H.T. and Boerngen, 7.G., 1984, Element C ncentrationc in Soils and <br /> Other Srsficial Materials of the Conterminous United States, U.S. Geological Survey Professional <br /> Paper 1270, United States Government Printing Office, Washington D.C. <br />