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ARCADIS <br />5. Conclusions and Recommendations <br />Based on the information presented in this report, we have concluded the following: <br />• No significant changes to groundwater quality at Holcim's CKD landfill have <br />occurred since 1998. <br />• Groundwater quality has not been affected by the disposal of CKD in the Portland <br />plant quarry. <br />• The sodium concentration in monitoring well MW-7 exceeded the DRMS-approved <br />compliance level by less than 10 percent and no other parameter exhibited an <br />exceedance of a compliance standard. Therefore, per the DRMS February 24, <br />2009 letter, the frequency of monitoring will remain annual. <br />2010 Groundwater <br />Monitoring Report <br />Florence, Colorado <br />• Groundwater flow patterns are consistent with historical data. <br />Holcim anticipates that the DRMS will set compliance parameters and standards for <br />MW-12 (background well) and MW-13 (compliance well). <br />is <br />GACOMMOM25510\10 Final Reports and PresentationsWamh 2010\Text\Holcim March 2010 Final GW Monitoring.docx 10