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GEOTECHNICAL ENGINEERING REPORT <br />GRAVEL PIT LINER EVALUATION <br />NCCI PIT #1 <br />WELD COUNTY ROAD 18 AND WELD COUNTY ROAD 25 <br />FORT LUPTON, COLORADO <br />TERRACON PROJECT NO. 21025057 <br />May 14, 2002 <br />INTRODUCTION <br />This report contains the results of our geotechnical engineering exploration at the proposed <br />gravel pit to be located at the northwest corner of Weld County Road 18 and Weld County <br />Road 25 in Fort Lupton, Colorado. This study was performed in general accordance with <br />our Proposal Number 21025074 dated April 2, 2002. <br />The purpose of these services is to provide information and geotechnical engineering <br />recommendations relative to: <br />• subsurface soil and bedrock conditions; <br />• groundwater conditions; and <br />• evaluation of the claystone bedrock materials for use as a potential liner material for <br />the proposed water storage pond. <br />The conclusions contained in this report are based upon the results of field and laboratory <br />testing, engineering analyses, and experience with similar soil and/or bedrock conditions. A <br />previous study was performed by Terracon addressing the development of the proposed <br />gravel pit, Terracon Project No. 22995081 dated June 2, 1999. Information from the <br />referenced -report was used in supplementing this study. <br />PROJECT INFORMATION <br />Based on the information provided, we understand that the site is to being considered as a <br />gravel pit, and subsequently as a water storage pond. The claystone bedrock materials are <br />being considered for use as a clay liner for the proposed storage pond to isolate the <br />proposed storage pond from existing groundwater. Maximum water levels within the <br />proposed pond are expected to be on the order of about 30 feet. <br />