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Marley Cooling Tower <br /> Page 4 <br /> Exposure Unit Risk Risk <br /> Cr VI .85 mg/d 41 (mg/kg.d)-1 .5 <br /> At present we do not know how much of the chromium is in the hexavalent form, and <br /> we have no data to determine how widespread the contamination might be. Lacking <br /> this data, we cannot make a realistic estimate of exposure or calculate a <br /> reasonable estimate of increased cancer risk due to Cr VI. <br /> More exposure data will have to be collected before a complete risk assessment <br /> can be performed. <br />