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City of Tracy, Ca. Air Dried Sludge <br />Mg/Kg, dried weight <br />Ceiling Alternative <br />Limit Limit <br />Aug -90 <br />Jun -91 <br />Jul -92 <br />Mar -93 <br />Mar -93 <br />Jul -93 <br />Arsenic <br />75 <br />41 <br /><3.3 <br /><10 <br /><10 <br />6.6 <br />Cadmium <br />85 <br />39 <br />4.4 <br />3.32 <br />4.3 <br /><2.5 <br /><2.5 <br />3.1 <br />Chromium <br />3000 <br />1200 <br /><54.7 <br />56.7 <br />61.3 <br />60.3 <br />72.9 <br />56.8 <br />Copper <br />4300 <br />1500 <br />437.6 <br />453 <br />337 <br />333.3 <br />508.5 <br />522 <br />Lead <br />840 <br />300 <br />112.7 <br />72 <br />54.9 <br />74.6 <br />110.2 <br />62.8 <br />Mercury <br />57 <br />17 <br /><0.1 <br />1.3 <br />0.7 <br />0.71 <br />Molybdenum <br />75 <br />18 <br />< 109.4 <br />15.9 <br />7.9 <br />12.3 <br />Nickel <br />420 <br />420 <br />43.8 <br />42 <br />55.3 <br />50.8 <br />47.6 <br />43.2 <br />Selenium <br />100 <br />36 <br /><0.55 <br /><15 <br /><15 <br />4.96 <br />Zinc <br />7500 <br />2800 <br />1 1312.91 <br />13721 <br />1270 <br />1396.8 <br />1694.9 <br />1560 <br />11 <br />L` <br />