Summary
CCR Surface Impoundment Dewatering Well Installation. This task requires the installation of nine (9) dewatering wells within Ash Pond per the Initial Well Installation detail on Drawing E102. Boreholes shall be 30 to 40" in diameter. Depths should range from approx. 27.5 ft. to just over 32 ft., which includes a 2 ft. deep sump into the Lower Cohesive Unit beneath the coal combustion residuals (CCR). The well will be constructed with either HDPE or PVC between 12- and 18-inch diameter (12" to 18"φ), pre-slotted, well screen sections (of
appropriate length) with a 7 ft. section of solid riser pipe that will extend 2 ft. above the surface of the CCR. See attached files.