1976-08-05 Soil Boring Report - Laserfiche WebLink

Home Browse Search

76- 301 Johnson 4 Peterson, Inc. -2- August 16, 1976 Mineral soils encountered in the borings were classified in accordance with the Unified Soils Classification System. A copy of that chart is attached. Representative samples of the soils brought to the surface by the auger will be retained in this office for a period of 60 days to be available for examination. Percolation tests were run in 6-inch diameter holes, drilled to a depth of 36 inches, in accordance with the procedures normally used on lots that will be developed residentially. In accordance with standard procedures, the holes were permitted to soak overnight before conducting the tests. Each of the borings was probed immediately after completion to check for the presence of groundwater. Results: The Log,of Soils encountered in the borings and the water level observations are shown on the attached Log of Boring sheets. Boring B-1 encountered brown, silty sand overlying slightly silty sands to the respective termination depth of 18h feet. Borings B-3 and B-4 typically encountered a sandy clay to a clayey sand overlying a stratum of slightlyy silty sand to silty s nd at or near the termination depth of the borings. orings B- nd B-S through B-8 all encountered a dark brown tu uxacx silty sand to depths on the order of 2 to 6 inches and then encountered strata of verying thickness and depths of sandy clay and silty clayey sand glacial till tn the._-__-'oo termination depth of each of these borin4Sn A black sandy boring B-7. In probing the borings immediately after completion, ground- water was not encountered in borings B-S a r was encountered at a depth of 11 feet in B-1, 18h feet in - and B-4, 1Z% feet in B-3, 9h feet in B-7 a in B- . B. A fairly large swampy area and Lake Minnetonka are :ocated at the southwest edge of the property. The contour elevation of the edge of this swamp to be roughly 930!. It then appears from this information that the groundwater table over the area under investigation would be above elevation 930. In boring B-1, water was encountered at an elevation of 94S. In boring B-4, water was encountered at elevation 934.5. There is considerable variation between these water level readings. Because of the cohesive nature Of the soils encountered, considerable time is required in order for the groundwater to stablize in the borings. It