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J4 <br /> �zz� <br /> May 5, 2005 Irerracon <br /> Consulting Engineers&Scientists <br /> 301 North Howes•P.O. Box 503 <br /> Connell Resources, Inc. Fort Collins, Colorado 80521-0503 <br /> Phone 970.484.0359 <br /> 4305 East Harmony Road Fax 970.484.0454 <br /> Fort Collins, Colorado 80525 www.terracon.com <br /> Attn: Mr. William Welch <br /> Re: Proposed Timnath -Connell Pit <br /> Bi-Monthly Groundwater Monitoring Episodes <br /> Terracon Project No. 20985110 <br /> Dear Mr. Welch, <br /> On April 7, April 8, and October 4, 1999, Terracon installed nine piezometers for the above referenced project as <br /> requested for purposes of monitoring the groundwater levels during the mining and extraction operations. Terracon <br /> has been requested to monitor the groundwater levels on a bi-monthly basis until further notice. Piezometer Nos. 1 <br /> and 2 were damaged in the spring of 2001 and were reinstalled on January 25, 2002. The following table shows <br /> the depth of where groundwater was measured from the ground surface elevations for Piezometer Nos. 2 through <br /> 9, for the six most current monitoring episodes. Beginning on April 17, 2003, Piezometer No. 1 was measured from <br /> top of pipe due to grading operations that were performed in this area of the site. <br /> Monitoring Dates Depth of Groundwater Below Ground Surface (ft) <br /> 1 2 3 4 5 6 7 8 9 <br /> July 7, 2004 7.3 4.6 (1) 6.2 1.3 3.7 4.4 3.3 4.7 <br /> August 23, 2004 7.2 4.6 t) 5.2 1.9 3.9 3.6 3.1 4.5 <br /> November 9, 2004 7.9 6.9 (1) 7.2 2.1 3.9 4.5 3.0 4.8 <br /> January 25, 2005 8.0 8.2 (t) 7.9 2.0 4.2 4.8 3.5 5.4 <br /> April 12, 2005 7.5 8.3 (1) 7.3 2.4 4.5 4.4 3.9 5.4 <br /> May 5, 2005 7.0 7.4 (1) 6.3 1.1 3.9 4.4 3.6 5.0 <br /> Piezometer No. 3 was buried during road construction operations when observed on July 7, 2004, therefore, no <br /> groundwater measurement was obtained. <br /> Terracon will continue to monitor the piezometers indefinitely until further notice as requested. If you have any <br /> questions or require further information, please feel free to contact us at your convenience. <br /> Sincerely, <br /> TERRACON <br /> David A. Richer, P.E. <br /> Geotechnical Engineer/Department Manager <br /> Copies to: Addressee (3) <br /> Tuttle-Applegate, Inc. (1): Mr. William Schenderlein <br /> Delivering Success for Clients and Employees Since 1965 <br /> More Than 60 Offices Nationwide <br />