2008-11-26_PERMIT FILE - M2008080 (10)

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Geotechnical Engineering Report Sand and Gravel Study Terracon Project No. 21085006 Terracon of other times or at other locations. Groundwater levels can be expected to fluctuate with varying seasonal and weather conditions. Based upon review of U.S. Geological Survey Maps, 01-1illier, et al, 1979), regional groundwater beneath the project area is expected to be encountered in unconsolidated alluvial deposits on the site at depths ranging from 5 to 10 feet below present ground surface. Sand/Gravel Mining Considerations: Based upon the materials encountered during the geotechnical exploration of the site and. the results of the laboratory testing, the site appears to be feasible for the purpose of mining significant quantities of gravel sized or larger aggregate. The depth of these materials ranges from approximately 3 to 57 feet below existing site grade. The depth of groundwater encountered indicates that the extraction of the majority of this material will require dewatering operations. Methods for dewatering could consist of installing isolated well points or placing a slung wall system around the proposed mining area. We recommend that the owners consult with an experienced sand/gravel mining company to further asses the economic and physical viability of using the site for mining. GENERAL COMMENTS This report should not be relied upon for final design, and should only be used for planning and budget purposes. The analysis and recommendations presented in this report are based upon the data obtained from the borings performed at the indicated locations and from other information discussed in this report. This report does not reflect variations that may occur between borings, across the site, or due to the modifying effects of weather. The nature and extent of such variations may not become evident until during or after construction. If variations appear, we should be immediately notified so that further evaluation and supplemental recommendations can be provided. The scope of services for this project does not include, either specifically or by implication, any environmental or biological (e.g., mold, fungi, bacteria) assessment of the site or identification or prevention of pollutants,. hazardous materials or conditions. If the owner is concerned about the potential for such contamination or pollution, other studies should be undertaken. 'Hillier, Donald E.; and Schneider, Paul A., Jr., 1979, Depth to Water Table (1976-1977) In the Boulder-Fort Collins- Greeley Area, Front Range Urban Corridor, Colorado, United States Geological Survey, Map 1-855-1. 4