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sample collection process was consistent with standard historical practices (e.g., a pump <br />dedicated to this well was used, sampling procedures were followed, etc.) so CEMEX has <br />eliminated sampling error. CEMEX could not identify any other potential sources of <br />error therefore, CEMEX believes that either the data obtained from the sample collected on <br />March 8, 2012 from CEM -004 well was an outlier or not representative of the <br />groundwater characteristics, or the sample was incorrectly handled at the external lab. <br />If there are any questions regarding the above information or the attachments, please contact me <br />at (303) 823 -2115. <br />Sincerely, <br />enise -' r, Ph.D. <br />Environmental Manager <br />5134 Ute Hwy PO Box 529 <br />Lyon, CO 80540 <br />Encls.\ Summary of Analytical Results (Table) <br />