Ground water site. A site where ground water is monitored. Ground water site type. SITEFILE_##.gw_type_cd Aquifers type code. The type of aquifer(s) penetrated by a ground water well. SITEFILE_##.aqfr_type_cd Well depth. The depth of the finished well, in feet below land-surface datum. The depth of the well is the greatest depth to which the well can be sounded; if measurement is not practical, enter the reported depth at which the well was finished. SITEFILE_##.well_depth_va Hole depth. Enter the total depth to which the hole was drilled, in feet below the land-surface datum, even though it may have been plugged back in completing the well. For collector or Ranney type wells, enter the depth of the central shaft. For multiple-well fields, interconnected wells, ponds, tunnels, or drains, leave the space blank and enter the data into the Miscellaneous Special-Cases Record. SITEFILE_##.hole_depth_va Source of depth data. SITEFILE_##.depth_src_cd