6.6. SR 08-19-2002 - Laserfiche WebLink

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GEOTECHNICAL EXPLORATION AND REVIEW FOR RESIDENTIAL ADDITION TWIN LAKES ROAD ELK RIVER, MINNESOTA AET #20-02044 SUMMARY Purpose You are proposing a new residential development at a site in Elk River, Minnesota. The purpose of our work on this project is to perform an exploration of subsurface conditions and provide geotechnical engineering recommendations to assist you and the project team in planning and consa'uction. Scope To accomplish the above purpose, you have authorized our firm to drill fourteen test borings at the site, conduct laboratory testing, and prepare this geotechnical engineering report. Findings The borings indicate a general soil profile consisting of topsoil or swamp deposits over naturally deposited alluvial and till soils. Ground water was present at nine of the borings at the time of drilling at depths ranging from about 0.3' to 6.5' below the ground surface. Perched water may at times be present where free draining sands are underlain by, or interlayered within, alluvial clays or tills. Recommendations These recommendations are condensed for your convenience. Study our entire report for detailed recommendations. The proposed buildings can be supported by conventional spread footings after soil correction. Foundations for the structures should be designed for an allowable soil bearing pressure of 2,000 pounds per square foot. Soil correction should include removing existing topsoil or swamp deposits and the near surface very soft to soft or very loose (N-value less than 5 bpf) f'me alluvium or mixed alluvium, and placing and compacting new fill to establish final grades. If the site soils are to be used as compacted fill, some of the site soils may have to be mechanically dried in order to reduce water contents to obtain proper compaction.