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<br />pa e L or ~ <br /> <br />CORING <br />Coring is done with a diamond or carbide bit on a double-tubed barrel. <br /> <br />LOGGING <br />Both factual data and interpretive information is included on boring logs. <br /> <br />In general, the information on the righthand side and the bottom of a log is <br />considered to be essentially factual data. <br /> <br />In the IIIdentificationll and IIGeologyll columns, the intent is to portray the soil <br />profile, or stratigraphy, based on interpretation of available data. Since the <br />information shown is interpretive, it is subject to error. The accuracy of the <br />information shown is controlled by the type and amount of data available. In <br />general, there are three basic categories of information shown: 1) the soil <br />identification, or "classification" of materials; 2) geologic identification of <br />the soils; and 3) the depths of the contacts between soil layers. <br /> <br />Determination of the depth to contacts between soil layers is arrived at by <br />taking into consideration the action of the drill tools and the appearance of <br />materials recovered. On a given boring log, contacts shown with solid and <br />dashed lines are used to indicate higher and lower accuracy, respectively. In <br />general, the entire soil profile is not observed or sampled. Consequently, <br />indicated depths of contacts may be incorrect, and some materials or layers may <br />be undetected in a boring and may not be indicated on a boring log. <br /> <br />Boulders and other large objects generally are not recovered !rom test borings. <br />This is due to limitations on the size of particles that can be recovered. <br />Though there may be no specific reference to such materials on boring logs or in <br />a report, they may be present in the ground. This is particularly applicable to <br />deposits such as coarse alluvium, uncontrolled fill, glacial till, outwash, <br />tumblerock, and weathered bedrock. <br /> <br />Typewritten logs are prepared based on field logs. A field log may contain in-o <br />terpretive information - such as notes regarding unusual drilling conditions - <br />which is not indicated on the typewritten log. <br /> <br />8/85 <br /> <br />A <br /> <br />,. 1"\' <br /> <br />'P' <br />