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<br /> <br />-5- <br />The suspended sediments carried in the Purgatoire River settle out in <br />Trinidad Reservoir downstream of the mine. The reducing environment of <br />lake bottom sediments have been shown to release heavy metals (toxic <br />ions) by the break down of colloidal particles and adsorbed complexes on <br />sediment particles. Thus, toxic ions not previously soluble in the river <br />may become soluble in the lake. <br />/e p <br />cc: Susan Mowry <br />Brian Munson <br />Jim Herron <br />Doc. No. 7137 <br /> <br />