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ARCAD1S <br />4. Sampling MW -13 <br />In April 2009, Holcim retained ARCADIS' services to install one new groundwater <br />monitoring well (MW -13) downgradient of the quarry operations, and to abandon three <br />groundwater monitoring wells that were no longer active. Details of the field activities <br />performed as part of the groundwater monitoring well installation and abandonments <br />were documented in the Final April 2009 Groundwater Monitoring Report (ARCADIS, <br />2009). <br />Following installation in April 2009, MW -13 was sampled on a quarterly basis for five <br />consecutive quarters at the request of the DRMS for the purpose of determining the <br />appropriate parameters and setting compliance standards for the well. Analytical <br />results were provided in the March 2010 Groundwater Monitoring Report (ARCADIS, <br />2010). MW -13 was added to the annual groundwater monitoring program and was <br />sampled in March 2011. Laboratory analyses of the groundwater samples were <br />conducted at ACZ's Steamboat Springs, Colorado facility and were analyzed for TDS, <br />sulfate, iron, manganese, potassium and sodium. Results of the laboratory analyses <br />are provided in Tables 2 and 3. Concentrations of iron and sulfate appear to be stable. <br />TDS and manganese have been decreasing. The potassium to sodium ratio has been <br />consistently less than 0.15 indicating that there is no discernable impact from CKD. <br />2011 Groundwater <br />Monitoring Report <br />Florence, Colorado <br />10 <br />