1980-07-28 Soil Boring Report - Laserfiche WebLink

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6/80 TERMINOLOG-Y_ - 011 BORING - - - - LOGS --------- GROUNDWATER Groundwater information is shown in two places on logs: 1) under "Water Level Measurements" and 2) in the "WB" column. Information under Water Level Measurements includes: 1) The depth to the water level (or drilling mud, if used) and the depth to the bottom of the hole (cave-in). Water level and cave-in measurements are taken with a weighted measuring tape. If free-standing water is not encountered in the hole, the term wet, or dry, is indicated under water level. This means that the soil adhering to the end of the measuring tape did, or did not, respectively, appear to be saturated. 2) The depth sampled and the depth of casing (or hollow -stem auger) for measurements made during the progress of the boring. 3) Date and time of measurements. Notation in the WB column describes whether soil samples appear to be water - bearing or saturated. Y means yes, N means no, and ? means questionable or indefinite. The water level symbol _V in the WB column indicates the apparent depth to the groundwater table at the bore hole. Determination of the depth to the groundwater table is an interpretive process. The determination is based on various factors, including: water level measurements, the appear- ance of samples, overall subsurface conditions, site conditions and weather conditions. The accuracy of the indicated depth to the groundwater table can be quite variable. The water level symbol with an arrow pointed down- ward (or upward) indicates that the water level is at or below (or above) the level indicated. Absence of the water level symbol does not neces- sarily mean groundwater was not encountered, or that the water table or piezometric surface was not penetrated. The presence of groundwater in the soil and the level of the groundwater table can change with time. The information in the WB column is based on observations and measurements made at the time the boring was drilled and water level measurements were taken. GEOTECHNICAL ENGINEERING CORPORATION