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Contour believes that elevated TDS concentrations in the alluvial wells are likely related to <br />falling water levels in the vicinity of the St Charles River, and subsequent concentration of <br />dissolved constituents in the shallow aquifer. These dry conditions at the facility also <br />minimize the potential for any groundwater to reach the compliance wells from the cement <br />plant, as continuous saturated conditions between the plant and the compliance wells are <br />unlikely to exist. <br />A semi - annual monitoring event is scheduled for December of 2012. Samples will be <br />collected for the complete monitoring suite (TDS, Sulfate, Radium 226, and Radium 228). <br />If significant precipitation does not occur in either the Pueblo vicinity or in the upstream St. <br />Charles River headwaters, then the ability to collect these samples will be compromised. <br />5 <br />