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Hennepin Parks ' <br /> Project BABX-91-589 <br /> December 19, 1991 <br /> � Page 2 . , <br /> ' <br /> . e 1B. Results <br /> B.1 Logs , <br /> Log of Boring sheets indicating the depths and identifications of the various soil strata, <br /> penetration resistances, laboratory test data and groundwater observations aze attached. The � <br /> suata changes were inferred from the changes in the penetration test samples and auger <br /> cuttings. Depths shown as changes between the strata are only approximate. The changes are � <br /> likely transitions and the depths of the changes vary between the borings. <br /> Geologic origins presented for each stratum on the Log of Boring sheets are based on the soil , <br /> types, blows per foot, and available common knowledge of the depositional history of the site. <br /> Because of the complex glacial and post-glacial depositional environments, geologic origins <br /> aze frequently difficult to ascertain. A detailed evaluation of the geologic history of the site , <br /> was not performed. <br /> „ „ , <br /> For this project, the standard penetration test borings are designated by the prefix ST and <br /> the power auger borings are designated by the prefix "B". The standard penetration borings ' <br /> were taken in the building area and the power auger borings were taken in the parking areas. <br /> B.2 Soils ' <br /> The soils encountered in borings B-1 through B-4 consisted of 1 1/2 to 3 feet of topsoil <br /> overlying silty sand or silty clayey sand. In borings B-1 and B-3, clays were encountered � <br /> below the silty sand. <br /> In borings ST-5 through ST-7, the soils encountered consisted of 1 1/2 to 2 feet of clay or ! <br /> clayey sand topsoil overlying granular soils to the termination depth of the borings. The <br /> granular soils consisted of poorly graded sand with silt to silty sand. In Boring ST-6, an , <br /> estimated 2-foot thick layer of lean clay was encountered at a depth of 7 feet. Layers of sandy <br /> silt were also encountered embedded in the granular stratum. <br /> ' <br /> The penetration resistances in the ;ranular strata ranged from 5 to 24 blows per foot (BPF). <br /> These values indicate these soils were in a loose to medium dense condition. The penetration ' <br /> resistance in the clay layer in Boring ST-6 was 9 BPF, indicating the clay had a rather stiff <br /> consistency. <br /> . ' <br /> � <br />