Ellingson-DTD installed one coal ash dewatering drain within a partially capped and closed mixed ash basin. The HDD was initiated alongside the target basin from the bottom of an excavated adjacent basin. The bore penetrated the target basin wall and trended along the bottom of the unlined basin at an upward 0.5% before terminating at the far edge of the basin.
The drilling returns indicated the bore penetrated clay and then a mix of fly ash and other coal ash residuals. The drain totaled 1,081’ in length and included 936’ of 4” diameter schedule 80 PVC screen.
Upon completion, the well passively discharged 10-20 gpm, and 5 months after installation and intermittent pumping, the drain is still producing 15 gpm.
