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GEOTECHNICAL ENGINEERING REPORT <br />. SAND AND GRAVEL STUDY <br />NORTHWEST OF WELD COUNTY ROADS 58 & 51 <br />WELD COUNTY, COLORADO <br />Terracon Project No. 21085006 <br />March 12, 2008 <br />INTRODUCTION <br />This report contains the results of our geotechnical engineering exploration for the proposed <br />sand and gravel pit to be located northwest of Weld County Roads 58 and 51 in Weld County, <br />Colorado. <br />The purpose of these services is to provide information and recommendations relative to: <br />• subsurface soil and bedrock conditions. <br />• groundwater conditions. <br />• feasibility of site for use as a sand and/or gravel mine. <br />The recommendations contained in this report are based upon the results of field and laboratory <br />testing, engineering analyses, our experience with similar soil conditions, and our understanding <br />of the proposed project. <br />PROJECT INFORMATION <br />Based on information provided by the client, the approximately 100-acre site is being <br />considered for development as a sand and gravel mining operation pit. <br />SITE EXPLORATION PROCEDURES <br />The scope of the services performed for this project included site reconnaissance by a <br />geotechnical engineer, a subsurface exploration program, laboratory testing and reporting. <br />Field Exploration: A total of 4 test borings were drilled on February 21, 2008 to depths of <br />about 50 feet below existing site grade at the approximate locations shown on the Boring <br />Location Diagram, Figure 1. The borings were advanced with a truck-mounted air percussion <br />drilling rig, utilizing 6-inch inside diameter flight auger. <br />The borings were located in the field with assistance from the client. The accuracy of boring <br />locations should only be assumed to the level implied by the methods used.