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• Drill Method below conductor casing—Hollow Stem Auger.Auger diameter: 8". <br /> • Casing type below conductor casing—2" SCH 40 PVC. <br /> • SCH 40 PVC Casing length—Approximately 30 feet. <br /> Please note that the lengths of the conductor casing and SCH 40 PVC casing below the <br /> conductor will be adjusted in the field according to subsurface conditions. We are <br /> targeting a high salinity groundwater zone,and the conductor casing will be used to seal <br /> off ALL shallower groundwater zones from the deep,high salinity zone. The depth and <br /> location of the high salinity zone are unknown at this time and field adjustments to these <br /> lengths will be necessary. <br /> The annular space between the conductor casing and the 15"borehole will be sealed <br /> with cement. The annular space between the conductor casing and the SCH 40 PVC <br /> will also be sealed with cement. Please see the attached schematic for materials to be <br /> used in the wells that contain a conductor casing,and refer to the workplan for a <br /> schematic for materials to be used on all other wells. <br /> Sincerely <br /> Leikam <br />