A field scientist has measured 2.0 meters of LNAPL gasoline floating on the water surface inside a groundwater monitoring well. 1a) Using a specific gravity for gasoline of 0.75 and a capillary fringe thickness of 0.4 meters, estimate the actual thickness of gasoline floating on the water table. 1b) The porosity is 0.35. Presuming gasoline is floating on the groundwater with a uniform thickness over an area approximated by a circle of 30 meters radius, calculate the volume of gasoline actually floating on the water table. 1c) Calculate the volume of gasoline using the apparent thickness of gasoline measured in the well. 1d) Calculate the gross volume difference between your answers to 1b) and 1c), which would be the error incurred by using the observed LNAPL thickness in the well. 1e) Calculate the % error in volume estimate introduced by the presence of the capillary fringe and its effect on LNAPL measurement in the well. Report your calculations in 1d) and 1e) in liters and percentage difference between actual and apparent gasoline volume.
A field scientist has measured 2.0 meters of LNAPL gasoline floating on the water surface inside a groundwater monitoring well. 1a) Using a specific gravity for gasoline of 0.75 and a capillary fringe thickness of 0.4 meters, estimate the actual thickness of gasoline floating on the water table. 1b) The porosity is 0.35. Presuming gasoline is floating on the groundwater with a uniform thickness over an area approximated by a circle of 30 meters radius, calculate the volume of gasoline actually floating on the water table. 1c) Calculate the volume of gasoline using the apparent thickness of gasoline measured in the well. 1d) Calculate the gross volume difference between your answers to 1b) and 1c), which would be the error incurred by using the observed LNAPL thickness in the well. 1e) Calculate the % error in volume estimate introduced by the presence of the capillary fringe and its effect on LNAPL measurement in the well. Report your calculations in 1d) and 1e) in liters and percentage difference between actual and apparent gasoline volume.
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