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Subsurface Exploration Information Ardaman & Associates , Inc . Our borings describe subsurface conditions only at the locations drilled and at the time drilled . They provide no information about subsurface conditions below the bottom of the boreholes . At locations not explored , surface conditions that differ from those observed in the borings may exist and should be . anticipated . The information reported on our boring logs is based on our drillers ' logs and on visual examination in our laboratory of disturbed soil samples recovered from the borings . The distinction shown on the logs between soil types is approximate only. The actual transition from one soil to another may be gradual and indistinct . The groundwater depth shown on our boring logs is the water level the driller observed in the - -borehole when it was drilled . These water levels may have been influenced by the drilling procedures , especially in borings made by rotary drilling with bentonitic drilling mud . An accurate determination of groundwater level requires long -term observation of suitable monitoring wells . Fluctuations in groundwater levels throughout the year should be anticipated . The absence of a groundwater level on certain logs indicates that no groundwater data is available . It does not mean that no groundwater will be encountered at that boring location . HAND AUGER BORINGS Hand auger borings are used , if soil conditions are favorable , when the soil strata are to be determined within a shallow (approximately 5 to 6 feet) depth , or when access is not available for our truck-mounted drilling equipment. A 3- inch diameter hand bucket auger with a cutting head is simultaneously turned and pressed into the ground . The bucket auger is retrieved at approximately 6=inch increments and its content emptied for inspection . Sometimes post-hole diggers are used , especially. in the upper 3 feet or so . The soil samples obtained are described and representative samples put in jars or bags and transported to the laboratory for further classification and testing , if necessary.