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<br />1 <br /> <br />1 <br />1 <br /> <br /> <br />1 <br /> <br /> <br /> <br />ll <br /> <br /> <br />RGI k 04548198 <br />Hotaam, Inc <br />January 27, 1999 <br />Page 4 <br />Drilling prepared by Roy L. Stienmier of Holnam's Exploration Department in 1977. The discussion of <br />the site geology presemed later in this report was primarily taken from the referenced 1977 document and <br />field observations made during RGI's investigation. <br />3.2 Geologic Field Mapping <br />Geologic field mapping was performed by RGI personnel prior to and during the installation of the new <br />monitoring wells onsite. Prior to mapping in the field, aerial photographs of the site were reviewed to <br />identify any observable geologic features. The field mapping consisted of observing outcrops along the <br />Arkansas River and vertical cuts in the active mining azea. The vertical cuts exposed the limestone <br />formations (i.e., the Smoky I-Gll and Fort Hays Members of the Niobrara Formation) overlying the Codell <br />Sandstone. Observations made in the field included the general orientation of the limestone formations <br />and the location and orientation of faults. The results of the field mapping aze discussed in Sections 4 and <br />5 of this report. <br />3.3 Water Well Survey <br />A water well survey was conducted to assist in evaluating the depth to ground water in the azea. The <br />water well survey included acquiring information from the State Engineer's Office. In addition, records <br />from the existing on-site wells (i.e., monitoring wells MW-1, -2, -3, and -4) were reviewed. <br />3.4 New Monitoring Well Installation <br />1 <br /> <br /> <br />Installation of new ground water monitoring wells began on August 18, 1998 and was completed on <br />August 22, 1998. Drilling and installation of the monitoring wells was performed by Layne-Western <br />(Layne) of Denver, Colorado. Drilling of the monitoring well boreholes was accomplished using an a'v- <br />rotary drilling rig. The objective was to install three (3) ground water monitoring wells: two (2) wells <br /> <br />