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2010 Groundwater <br />• <br />ARCADIS Monitoring Report <br />Florence, Colorado <br />4. Quarterly 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groundwater monitoring wells that were no longer active.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). Discussion of quarterly sampling analytical results for MW-13 is presented <br />below. <br />Following installation in April 2009, MW-13 has been sampled on a quarterly basis for <br />five consecutive quarters. 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 />for the past five quarterly events are provided in Table 3. Concentrations of sulfate <br />appear to be stable. TDS and manganese have been decreasing. Iron has increased <br />0 slightly possibly due to seasonal changes. The potassium to sodium ratio has been <br />consistently less than 0.15 indicating that there is no discernable impact from CKD. <br />E <br />GACOMMOM25510\10 Final Reports and P-t tionsWlamh 2010\Tezt\Holcim Much 2010 Final GW Monitonng.d- 9