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COLORADO LEGACY LAND <br /> $CHWARTZWALDER MINE <br /> the precipitation of iron sulfides. In addition to the formation of insoluble uranium species,trace metals may <br /> coprecipitate with or adsorb on the surfaces of the iron sulfides. <br /> The in-situ treatment consists of injecting carbon sources,e.g.,molasses,alcohols such as ethanol and methanol, <br /> to stimulate the activity of native SRB. Oxidized sulfur compounds can be used as terminal electron acceptors <br /> for the anaerobic respiration of organic matter by SRB.SRB obtain energy by coupling the oxidation of organic <br /> compounds to the reduction of sulfate or other sulfur compounds to sulfide.Soluble sulfides are produced that <br /> react with chalcophile metals (e.g., zinc, cadmium, lead, copper) to precipitate low solubility metal sulfide <br /> phases.A phosphate source such as phosphoric acid is also added,as necessary,as a nutrient for the microbes. <br /> AUGUST 2022 20 AMENDMENT 6 <br />