Dewatering & Groundwater Control
Crane Valley Dam, Madera County, CA

A system of ejector wells installed to maintain groundwater below subgrade level for excavation and construction of a rock-filled buttress to improve the factor of safety of the dam. Five deep wells were also installed to relieve artesian pressure.  

Download crane-valley-dam.pdf

Nesbitt Dam, Scranton, PA

Dewatering wells in the area of a surface depression on the side of an earthen dam to provide additional information regarding the location of possible piping paths through the dam core, followed by a program of low mobility grouting to locate and seal the paths.

Download nesbitt-dam_001.pdf

Atlantic City Brigantine Connector

Design and installation of a system of shallow penetrating wells within tight, steel sheeting excavation support to provide dry subgrade while minimizing off-site groundwater drawdown during cut-and-cover construction of a 2,900-foot long depressed roadway adjacent to a canal.

Download atlantic-city.pdf

Dry Dock #8

Deep well dewatering to draw groundwater below the floor level of a dry dock to reduce buoyancy, maintain structural integrity, and control water infiltration during dock wall and floor rehabilitation.

Download drydock-8.pdf

ConocoPhillips Bayway Refinery, Linden, NJ

Download Bayway-web.pdf

Kansas Underground Salt Museum, Hutchinson, KS

Freezing of more than 135 vertical feet of sand and mudstone overburden to ensure completely dry and stable excavation during construction of an elevator shaft for transportation of museum visitors 650 feet below ground.

Download Kansas_Underground_Salt_Musuem_Hutchinson_KA.pdf

NYC Water Tunnel No. 3, Manhattan, NY

Ground freezing of varying depths of overburden for excavation support and groundwater control at five shaft locations to aid construction of deep vertical access shafts connecting to the new water tunnel 500+ feet below ground.

Download Water_Tunnel_No3_NY_NY.pdf

Gibson County Coal Mine, North Portal No. 2, Princeton, IN

Ground freezing of more than 100 feet of saturated soils to facilitate sinking of a mine shaft, 32 feet in excavated diameter, through the overburden and underlying rock to a depth of 550 feet below ground surface.

Download Gibson_County_Coal_Mine_Princeton_Indiana.pdf

Combined Sewer Overflow Tunnel, Providence, RI

Ground freezing for excavation support and groundwater control to aid installation of six CSO shafts to depths of up to 175 feet. Permeation grouting was performed at one shaft to close anomalous “windows” in the frozen wall that occurred as a result of unanticipated subsurface conditions.

Download Combined_Sewer_Overflow_Tunnel_Providence_RI.pdf

Wheel Truing Facility, Harrison Maintenance Facility, NJ

Multi-system project involving a micropile foundation system, wellpoint dewatering and installation of an earth support system to allow excavation of a below-grade wheel truing facility housing heavy machinery at PANYNJ’s Harrison, NJ location.

Download Wheel_Truing_Facility_NJ_001.pdf

South Ferry Terminal, Manhattan, NY

Ejector wells installed to draw groundwater to top of rock at 85 feet below grade to aid underpinning of, and excavation below, two existing subway tubes for new cut-and-cover tunnel construction.

Download South_Ferry_Terminal_Manhattan_NY.pdf

Orchard Square Apartments, East Rutherford, NJ

Multi-system project involving wellpoint dewatering to draw groundwater below excavation subgrade, installation of 6,700 square feet of tied back, temporary beam and lagging excavation support, and treatment of low levels of contaminants present in the groundwater.

Download Orchard_Square_Apartments_East_Rutherford_NJ.pdf

City Hall, Ventnor, NJ

Deep well dewatering to draw groundwater down below new elevator pit subgrade, coupled with permeation grouting to stabilize the sandy soils prior to excavation.

Download City_Hall_Ventnor_NJ.pdf

Case Library, Colgate University, Hamilton, NY

Wellpoint dewatering to lower groundwater levels below excavation subgrade and installation of a tied back, beam and lagging system to support a slope cut up to 27 feet deep to create space for a 51,000 square foot library addition.

Download Case_Library_Hamilton_NY.pdf

Beacon Hill Station, Seattle, WA

Deep well dewatering to depths of 190 feet  to drain and stabilize granular deposits in advance of SEM tunneling.

Download Beacon_Hill_Station_Seattle_Washington.pdf

Lyman Run Dam, Lyman Run State Park, Galeton, PA

Deep well dewatering to lower groundwater below core foundation subgrade for dam replacement.

Download Lyman_Run_Dam_Galeton_PA.pdf

Watres Dam, Spring Brook, PA

Injection of a balanced stable cement-based grout through a single line of grout holes to reduce the permeability of the weathered rock upstream of the dam spillway and eliminate leakage potential prior to spillway expansion.

Download Watres_Dam_Spring_Brook_PA.pdf

World Trade Center, Bathtub Rehabilitation, Manhattan, NY

Urethane grouting to control water groundwater leakage into the  damaged WTC “bathtub” through  slurry wall panel joints and tieback penetrations.

Download WTC_Manhattan_NY.pdf

East Side Access, Bellmouth Work Shaft, New York, NY

Permeation grouting to seal excavation support interfaces, close gaps and joints, and create a bulkhead around an existing subway structure to ensure a watertight work shaft.

Download East_Side_Access_NY_NY.pdf

Bear Creek Dam, Russellville, AL

Installation of a deep well system, an eductor system, and tied back soldier pile and lagging support systems to facilitate construction of a new RCC structure at the toe of an existing dam.

Download BearCreek_Dam_Russellville_Alabama.pdf