Moretrench designs and installs a dewatering system to drain a 240,000 square foot ash pond to stabilize deposits up to 12 feet thick, allowing safe removal with conventional truck-mounted excavators.
Chief Engineer Pat Powers authors Construction Dewatering, which soon becomes the industry bible. Updated and expanded editions follow in 1992 and 2007
Dewatering work begins on Phase 1 of the massive Lock & Dam 26 across the Missouri River. Two more phases follow over an 11 year period. The landmark project realizes more that $55 million in revenue.
In the first of several contracts for New York’s City Water Tunnel #3, ground freezing facilitates the sinking of three deep shafts.
In an unusual application, ground freezing is used to prevent further erosion at an abandoned salt mine in Louisiana that houses 2.1 million gallons of the nation’s Strategic Petroleum Reserve. The freeze is maintained for five years while the oil is pumped out.
Installation of 450 wells through the half-mile long dividing wall of Hillview Reservoir in New York provides the pressure relief on the wall that allows the twin basins to be safely drained and cleaned in turn.
The Lenox Avenue subway reconstruction project in New York City involves dewatering of a 2,500-foot long subway tunnel section to allow concrete invert replacement. Well installation and dewatering is accomplished within the active tunnel.
As an integral part of the design-build team, Moretrench provides the dewatering system for construction of the underground section of the Tren Urbano metro in San Juan, PR.
Mass ground freezing allows jacking of three massive box tunnels under rail tracks leading to Boston’s South Station for the Big Dig. This remains the largest single ground freezing effort in the USA to date.
One of the company’s first specialty geotechnical jobs was soil nailed underpinning and excavation support for expansion of the Robert Wood Johnson University Hospital in New Brunswick, NJ.