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�,• <br /> ■� � Mr. Charles Thompson <br /> � Project BL-04-05907 <br /> � October 27,2004 <br /> Page 13 <br /> � � . <br /> � <br /> � used to drive the standard 2-inch split-barrel sampler a total penetration of 1 1/2 feet below the tip of the <br /> � hollow-stem auger. The blows for the last foot of penetration were recorded and are an index of soil <br /> ■ strength characteristics. Samples were taken at 2 1/2-foot vertical intervals to the termination depths of <br /> the borings. A representative portion of each sample was then sealed in a glass jar. <br /> � � . <br /> � E.2. Soil Classification <br /> ■ The drill crew chief visually and manually classified the soils encountered in the borings in general <br /> accordance with ASTM D 2488, "Description and Identification of Soils(Visual-Manua!Procedure)." <br /> � A summary of the ASTM classification system is attached. The samples were then returned to our <br /> ■ laboratory for review of the field classifications by a soils engineer. Representative samples will remain <br /> ' in our Minneapolis office for a period of 30 days to be available for your examination. <br /> � <br /> ■ E.3. Groundwater Observations <br /> Immediately after taking the final samples in the bottoms of the borings,the holes were probed through <br /> � the hollow-stem auger to check for the presence of groundwater. Immediately after the auger was <br /> � � withdrawn,the holes were again probed and the depths to water or cave-ins were noted. The borings <br /> . were then immediately backfilled. <br /> � <br /> F. General Conditions <br /> ■ <br /> ■ F.1. Basis of Recommendations <br /> ■ The analyses and recommendations submitted in this report are based upon the data obtained from the <br /> soil borings performed at the locations indicated on the attached sketch. Often,variations occur between <br /> � these borings,the nature and extent of which do not become evident until additional exploration or <br /> , construction is conducted. A reevaluation of the recommendations in this report should be made after <br /> performing on-site observations during construction to note the characteristics of any variations. The <br /> � variations may result in additional foundation costs, and it is suggested that a contingency be provided <br /> � for this purpose. <br /> � It is recommended that we be retained to perform the observation and testing program for the site <br /> ■ preparation phase of this project. This will allow correlation of the soil conditions encountered during <br /> construction to the soil borings, and will provide continuity of professional responsibility. <br /> � <br /> � <br /> � <br /> � <br />