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laboratory tests performed on these soil samples. If any groundwater was encountered in a borehole, the <br />approximate groundwater depth, and date of observation, is depicted on the log. Groundwater depth estimates are <br />typically based on the moisture content of soil samples, the wetted portion of the drilling rods, the water level <br />measured in the borehole after the auger has been extracted, or through the use of an observation well. <br />