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Table 1. (continued) <br />Material and units Concentrationa Referenceb <br />(in parentheses) <br />FOSSIL FUELS (mg/kg) <br />Coal <br />Canada 4 (0.3-100) 3 <br />USA 5 2 <br />Czechoslovakia Max. 1,500 2 <br />Worldwide 13 (0.0-2,000) 1 <br />Coal ash (<20-8,000) 3 <br />Flyash (2.8-200) 3 <br />Petroleum 0.2 3 <br />Petroleum ash Max. 100,000 3 <br />Automobile particulates 298 3 <br />GROUNDWATER (ug/1) <br />Near polymetallic sulfide <br />deposits Max. 400,000 3 <br />Near gold mining activities >50 2 <br />USA Usually <10 2 <br />USA 17.9 (0.01-800) 3 <br />LAKE WATER (ug/1) <br />Dissolved solids <br /><2,000 mg/l (0.0-100) 6 <br />>2,000 mg/l (0.0-2,000) 6 <br />Lake Superior (0.1-1.6) 6 <br />Japan, various (0.2-1.9) 6 <br />Germany, Elbe River (20-25) 6 <br />Searles Lake, California (198,000-243,000) 1,4 <br />California, other lakes (0.0-100) 1,4 <br />Michigan Max. 2.4 1,4 <br />Wisconsin (4-117) 1,4 <br />Florida Max. 3.6 1,4 <br />Lake Chautauqua, New York (3.5-35.6) 1,4 <br />Lake Ohakuri, New Zealand (30-60) 7 <br />Finfeather Lake, Texas Max. 240,000 8 <br />16