1984-09-01 Soil Report - Laserfiche WebLink

Home Browse Search

SITE AND GEOLOGY The subject site is located on Fagerness Point, a peninsula of land extending into the West Arm of Lake Minnetonka. An existi g house, which will be raised to accommodate the prop3?ed dwelling, currently occupies the site. The existing topography of the prop- erty generally slopes downward toward Lake Minnetonka, with eleva- tions at the borings of 933.2 feet (TH-1) and 931.6 feet (TH-2), and at the edge of the lake at 929.2 feet. Natural inorganic soils in this area consist of clayey glacial till related to the Des Moines ice lobe of the Wisconsin glaciation, and alluvial soils derived from the till soils. During post -glacial times, a surface layer of organic soils has formed. Mixed fill currently rovers the surface at the borings. According to information published by the State of Minnesot Geologi^al Survey, the uppermost bedrock stratum under this area is believed to be Jordan sandstone or St. Lawrence dolomite, and probably occurs at consideia tiie depth below ground surface. SOIL CONDITIONS Three basic soil types werE encountered in the borehol,_:s. These are: mixed fill and organic soils; clayey alluvium; and clayey glacial till. Mi>,:!d Fill and Organic Soils A layer of mixed fill and organic soils cover the surface at the test holes. This layer ex=ends to a depth of 5.5 feet at TH-1 and 6.5 feet at TH-2. This deposit consists of a mixture of sandy clay, sandy silt, organic sandy clay, and clayey silt. It is moist to saturated and generally in a soft condition. In its existing condition the mixed fill and topsoil is not suitable for foundation or f iuor s! ah support.. It -i l 1 be npr^e��3 y to remove this soil from below footings and floor slabs. This material is generally not suitab'e for re -use as a structural fill material. SUBTERRANEAN EAGINEERING CORP. Y �♦ MINIVEAPOLIS. MINNESOTA