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' Hennepin Parks ' <br /> Project BABX-91-589 <br /> December 19, 1991 <br /> Page 2 ' <br /> ' <br /> t <br /> B. Results <br /> B.1 Logs 1 <br /> Log of Boring sheets indicating the depths and identifications of the vazious soil strata, <br /> penetration resistances, laboratory test data and groundwater observations are attached. The ' <br /> strata 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 chanbes 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 /> are frequently di�cult to ascertain. A detailed evaluation of the geologic history of the site <br /> was not performed. <br /> 1 <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 peneuation 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 soiis 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 soiis 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 /> granulaz 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 embedde� in the granular stratum. <br /> ' <br /> The penetration resistances in the granular strata ranged from 5 to 24 blows pe� foot (BPF). <br /> These values indicate these soils were in a loose to medium dense condition. The peneuation , <br /> resistance in the clay layer in Boring ST� was 9 BPF, indicating the clay had a rather stiff <br /> consistency. <br /> ' <br /> ' <br />