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Colorado Division of Reclamation Mining and Safety January 6, 2011 <br />N Mr. Eric Scott 7 103-81640 <br />¦ Boron was present in the September 2010 groundwater sample from well MW-3 <br />(0.77 mg/L) at a concentration slightly above the benchmark level of 0.75 mg/L. <br />¦ TDS was present in the September 2010 groundwater sample from well MW-4 at a <br />concentration above the calculated benchmark level of 10,212 mg/L. <br />If you have any questions or need additional information, please do not hesitate to contact the <br />undersigned. <br />Sincerely, <br />GOLDER ASSOCIATES INC. <br />Tammy Rauen, E.I. Ed Pottorff, P.G. <br />Project Geologica ngineer Associate/Senior Hydrogeologist <br />cc: Meg Garakani, Holcim (US) Inc. <br />Mike Toelle, Holcim (US) Inc. <br />Lisa Olsen, Holcim (US) Inc. <br />Attachments: <br />Table 1 Monitoring Well Construction Details <br />Table 2 Monitoring Well Hydraulic Conductivity Testing Results <br />Table 3 Groundwater Quality Results from the September 2010 Monitoring Event <br />Table 4 Comparison of September 2010 Concentrations to Benchmark Levels <br />Figure 1 CKD Disposal Areas <br />Figure 2 CKD Disposal Areas A2 and A2-A and Monitoring Well Locations <br />Figure 3 July 30, 2010 Potentiometric Surface Map <br />Attachment A Historical Water Quality Data <br />Attachment B Slug Testing and Estimation of Hydraulic parameters at Monitoring Well MW-04 Technical <br />Memo <br />Attachment C Groundwater Sampling Field Forms, Chain of Custody, and Laboratory Analytical Results <br />Attachment D Time Concentration Plots <br />Attachment E Methodology for Determining Benchmark Levels <br />TR/EJP/kag <br />I iA10\81640\0400\gwrep_fn1 _06jan11\10381640 holcim gwrep_fnl-ItrO6jan11.docx <br />Golder <br />Associates