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. Paul Madson and <br /> Associates, Ltd. <br /> • Project BABX-92-813 <br /> January 6, 1993 <br /> Page 6 <br /> Split-Barrel Sampling of Soils." Using this method, we advanced the bore hole with the hollow- <br /> stem auger to the desired test depth. A 140-pound hammer falling 30 inches was then used to <br /> drive the standard 2-inch split-barrel sampler a total penetration of 1 1/2 feet below the tip of <br /> the hollow-stem auger. The blows for the last foot of penetration were recorded and are an <br /> index of soil strength characteristics. Samples were taken at 2 1/2-foot vertical intervals to the <br /> 15-foot depth and then at 5-foot intervals to the termination depths of the borings. A <br /> representative portion of each sample was then sealed in a glass jar. <br /> E.2 Soil Classification <br /> Soils encountered in the borings were visually and manually classified in the field by the crew <br /> chief in general accordance with ASTM D 2487, "Classification of Soils for Engineering <br /> Purposes," and ASTM D 2488, "Description and Identification of Soils (Visual-Manual <br /> Procedures)." A summary of ASTM D 2487 is attached. All samples were then returned to our <br /> laboratory for review of the field classifications by a soils engineer. Representative samples will <br /> remain in our Minneapolis office for a period of 60 days to be available for your examination. <br /> E.3 Groundwater Observations <br /> Immediately after taking the final samples in the bottoms of the borings, the holes were probed <br /> through the hollow-stem auger to check for the presence of groundwater. Immediately after <br /> withdrawal of the auger, the holes were again probed and the depths to water or cave-ins were <br /> noted. The water levels were rechecked and the bore holes backfilled by our crew just prior to <br /> leaving the site. <br /> F. General Recommendations + <br /> F.1 Basis of Recommendations <br /> The analyses and recommendations submitted in this repoR are based upon the data obtained <br /> from the soil borings performed at the locations indicated on the attached sketch. Variations <br /> occur between these borin�s, the nature and extent of which will not become evident until <br /> additional exploration or construction is conducted. A reevaluation of the recommendations of <br /> this repoR should be made after performing on-site observations during construction and noting <br />