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(fit I'!_ •' 1 `!i. 1 1 l 1 �I`I NE'�hIH r'I _ JHTV HUrG G4J5 <br /> April 28, 1992 <br /> Updated <br /> Metals Southbay Northbay S.F. U.S. Mean Notes <br /> Potassium 1.6% 2% 1.1% 1.5% <br /> Rubidium - <20-45 <20-45 58 <br /> Scandium 15-40 15-40 15-40 7.5 <br /> Selenium *+$ 0.5 0.5 0.1 0.26 1 <br /> Silicon - 2?% 35% 31% <br /> Silver *+$ - - - - 1, 2 <br /> Sodium 1.5-7% 1.5-111% 0.7% 0.59% <br /> Strontium 150 70-100 200-300 120 <br /> 0 1 Sulfur Soo 800 1200 <br /> Thallium *+ - - - - 1, <br /> Thorium - 2.6-6.7 2.6-6.7 8-6 <br /> Tin - 2-7 2-7 0.84 <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 *+ 110-510 120-510 120-510 48 1 <br /> Zirconium <20-100 200 <20-100 Iso <br /> 1. One of 13 Priority Pollutant Metals (*) <br /> One of 17 EPA Method 6010/7000 Metals (+} <br /> One of 8 Er"luXiClly T4i r j YL6LI iS t n) <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, J.G., 1984, Flemntn in SQi1s •n <br /> Other Surficis M. =rials of-the Conterminous United-States, U.S. Geological Survey Professional <br /> Paper 1270,United States Government P=ting Mee,Washington D.C. <br />