2007-08-10_REVISION - M2001107 (4)

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Geotechnical Engineering Report Gravel Evaluation ~• Northwest of Weld County Roads 18 and 25 • Weld County, Colorado Terracon Project No. 21035117 Terracon stratum. However, estimated gravel sizes are limited by the sampling method utilized and are based on field observations of the auger cuttings. Lenses of larger particle sizes may be encountered which were not observed in the samples obtained. In order to use this material for typical construction materials such as base course, concrete, and asphalt aggregate, extensive screening may be required. This may generate large amounts of reject sand material. The material may be used without • processing for structural fill and subbase material. To more accurately evaluate the quality of the • granular material as well as the size of the particles, test pits should be dug at the site and detailed • laboratory tests should be performed. ' Since the sand and gravel is below groundwater, dewatering of the pit will be required to excavate the _ sand and gravel, or a drag line will be needed to remove the overburden and aggregate. GENERAL COMMENTS The analysis and recommendations presented in this report are based upon the data obtained from the borings performed by Terracon at the indicated locations. This report does not reflect variations, which may occur between Borings or across the site. The nature and extent of such variations may not become evident until mining operations are performed. These variations may effect the quantity and or the quality of the materials encountered. The scope of services for this project does not include either specifically or by implication any _ environmental assessment of the site or identification of contaminated or hazardous materials or conditions. If the owner is concerned about the potential for such contamination, other studies should be undertaken. This report has been prepared for the exclusive use of our client for specific application to the project discussed and has been prepared in accordance with generally accepted geotechnical engineering practices. No warranties, either express or implied, are intended or made. In the event that changes in the nature, design, or location of the project as outlined in this report, are planned, the conclusions and recommendations contained in this report shall not be considered valid unless Terracon reviews the changes, and either verifies or modifies the conclusions of this report in writing. 4