Based on the site specific subsurface conditions , deep wells are often the most efficient and cost effective dewatering solution. In the case of glacial and alluvial deposits of coarse-grained sands, gravels, cobbles, and boulders, deep wells are often the only possible answer. Malcolm Drilling has the experience, tools, and equipment to install dewatering systems in the most difficult subsurface conditions. With our fleet of state-of-the-art, high-torque, hydraulic drill rigs, and our vast array of drill tools, including augers, digging buckets, rock augers, core barrels, down-hole hammers, and cluster drills; we are capable of drilling through sand, gravel, cobbles and boulders, rock (fractured and in-tact) as well as artesian conditions (high-pressure groundwater).
This technology incorporates high torque drill rigs and/or casing Oscillators & Rotators to advance heavy wall steel casing into the ground concurrent with the excavation without any vibration or ground loss. Either permanent steel casings or sectional temporary (removable) casings can be installed over a specified depth or the full length of the drilled shaft. Temporary drill casings are installed in segments of typically 10 to 25 feet and joined with a double wall bolted connector, providing a flush outside diameter of the casing. Carbon teeth on the casing tip allow for greater installation depth and enable the advancement through obstructions as well as penetration into rock.