Some of our Projects

Tunnels and Sewers

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Geotechnical

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Structural/Civil

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Rehabilitation

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Tunnels and Sewers

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City Tunnel No. 3, New York, NY

Two existing tunnels constructed in 1917 and 1936 needed to be closed in order to complete required maintenance and repairs. The New York City Department of Environmental Protection commissioned design and construction of City Tunnel No. 3 to provide a bypass to the existing tunnels. The largest tunnel construction project in the history of New York City, City Tunnel No. 3 was constructed in two stages: a 13-mile drill and blast section and a 15-mile intercommunity tunnel.  


The following consulting services were provided to Grow-Perini-Skanska, AJV during the second construction stage:  

 1. Design of the tunnel bulkhead to take the full 900 feet of hydrostatic head. 

2. Design of the underground vaults for electrical service and ventilation to the tunnel. 

3. Investigation of a support system for shaft construction by down drilling equipment. 

4. Report for the concrete strength requirement for the lining form stripping.

Easterly District CSO Phase II Facilities Plan, Cleveland, OH

Northeast Ohio Regional Sewer District undertook the Easterly CSO Phase II Facilities Plan to identify causes of and develop solutions for the activation of combined sewer overflows (CSO's) in the Easterly service district.  A system of conveyance and storage facilities were identified to capture combined sewerage for treatment in accordance with the United States Environmental Protection Agency (EPA) CSO Policy and the Ohio EPA CSO Control Strategy.  The first step taken by the District to implement the Easterly CSO plan was to advance the major CSO control systems to preliminary (30%) design.  This effort, called the Easterly Advanced Facilities Plan (AFP) had the following components:  

  • Storage Tunnels
  • Tunnel Dewatering 
  • Pump Station
  • Consolidation Sewers and Interceptor Relief
  • Euclid Creek Pump Station 

Involvement included assistance with analyses to rank and select drop structure alternatives.  Also assistance with the selection of construction shaft methodologies for the purposes of computing a cost estimate comparison. 

Northern Boulevard Crossing, MTA, NY

Dawn Underground Engineering, Inc. provided expert assistance in reviewing and checking designs and analysis provided by the general engineering consultant for construction of the crossing. 


DUE performed an independent Plaxis analysis for Sequential Excavation Method (SEM) for the crossing excavation with seven (7) cells; reviewed and provided comments on details of design and geotechnical parameters used in the analysis.


To aid with stability of the excavation for this shallow crossing, freezing of the soil was employed to control ground water inflows and provide added stability for the SEM excavation.


DUE participated in progress meetings associated with coordination of the SEM design and construction requirements. 

CSO No. 4 and No. 5, Richmond, Virginia

The work included construction of approximately 6,500 linear feet of 160-in. inside diameter combined sewer overflow retention tunnel from McCloy to Hampton Street in the City of Richmond. Special structures included a tunnel shaft and pump station at the McCloy site, a shaft and Kanawha Canal water intake structure at the Hampton site, tunnel vent shafts, and regulators at both the Hampton and McCloy sites.  


Expertise was provided in the fields of tunneling and underground structures. Services included initial feasibility studies and a development of subsurface investigation plan to determine the tunnel alignment and tunnel design. The design included the initial tunnel support system and final lining. The initial supports consisted of rock dowels and ribs for various sections of the tunnel. Final tunnel lining was designed using a structural analysis program to withstand both internal and external pressures. Also provided were construction cost estimates and contract specifications for tunnel and shaft construction.

Dobson's Run Tunnel, Philadelphia, Pennsylvania

The project consists of constructing a new 12.5-ft finished diameter storm water CIP tunnel and a river outlet to divert flow from an aging 8.5-ft ID brick sewer that is deteriorating, capacity-strapped, and has accessibility issues. The new storm sewer will start at the Schuylkill River and continue along the projected alignment of Allegheny Avenue until intersecting with 32nd Street at a 90-degree angle, where it will turn and continue until intersecting with the proposed connection structure. To make the connection approximately 30 lf of the top half of the existing brick sewer is to be removed in order to accommodate the construction of a diversion channel which in turn spills into the proposed jet-flow drop structure. Tunnel excavation is to be performed using a TBM or a Roadheader. Blasting as a means of tunneling is prohibited.

Mill Creek Tunnel, Phase 2, Cleveland, Ohio

The Mill Creek Interceptor is a 41,650-ft. long tunnel and pipeline sewer system designed to reduce the CSO discharges to the environment by shoring and then conveying wet weather flow for treatment. The project required construction of a 20-ft. diameter concrete tunnel and associated drop structures.  


Provided engineering analysis for tunnel and shaft final structure lining. Services included design of 3 vortex drop structures, drop structure hydraulic geometry and bid document preparation. Also provided were construction administration services, which included shop drawing review, as-built records, and assistance to the resident engineer.

Geotechnical

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Newtown Creek CSO, Brooklyn & Queens, NY

      

Geotechnical   Investigation and Design for modification and addition to four CSO structures   in Brooklyn and Queens, New York. The purpose of the project was to reduce the   pollution load to Newtown Creek by minimizing overflows of combined sewers.


DUE   responsibilities included: geological program planning and field investigation   including preparation of health and safety plan, inspection of the drilling   work, preparation of boring logs, evaluation of boring data and soil test results, preparation of geotechnical data report and geotechnical foundation and construction design reports. A comprehensive settlement monitoring system was also prepared to protect adjacent buildings, structures and utilities. 


DUE’s   other responsibilities included assessment of excavation support system, selection of methods for protection of existing facilities during construction, dewatering calculations, and coordination with other design disciplines such as civil, mechanical,   structural, MPT, etc.  

City Island Sub-Aqueous Water Main Crossing, Borough of the Bronx, New York

  

The Department of Design and Construction (DDC) has undertaken plans to increase water services to City Island residents, Bronx, New York. 


Dawn Underground Engineering, Inc. provided geotechnical engineering services and trenchless technology for the preliminary and final design of two new 20” water main extensions to City Island. 


Services included evaluation of different alternatives of Horizontal Directional Drilling (HDD) and Microtunneling.  Because of site constraints, the HDD alternative with compound curve was selected with a horizontal radius of 5500-ft and vertical radius of 5000-ft. Two parallel crossings will be provided, each consisting of a 48-in borehole, 32-in steel casing and 20-in ductile iron water main. The length of each crossing will be approximately 2000-ft. Services included a geotechnical investigation: selection of land and marine boring locations, procedure for soil and rock testing, and assistance to driller during drilling operations. 

Pemberton School, Pemberton, New Jersey

For a new school located in Pemberton,  Dawn Underground Engineering, Inc. (DUE) conducted geotechnical investigation consisting of borings and test pits to determine the subsurface soil conditions, soil characteristics, groundwater level, soil infiltration rate and bearing capacity of foundation soils.


A report outlining the soil condition and providing recommendation for fill placement, foundation bearing capacity and storm water recharge rates was prepared and submitted to the client. 


Perth Amboy Station Improvements, NJ Transit

Dawn Underground Engineering, Inc  was the geotechnical and foundation engineering consultant for this rail station access improvements project. Our responsibilities consisted of:

  • Coordination for access for drilling along the NJT Rail tracks
  • Development of a geotechnical investigation program
  • Supervision of drilling of thirteen (13) borings 
  • Preparation of boring logs
  • Selection of soils laboratory tests
  • Preparation geotechnical data report
  • Geotechnical foundation design   for project structures

Jamaica WPCF Emergency Generators, NYC DEP

EEGeotechnical investigation and analysis of new generator station slab foundation impact on an existing utility tunnel. DUE reviewed existing geotechnical information, as-built drawings and prepared preliminary impact assessment on the existing tunnel under anticipated loads from construction of a new slab foundation spanning over utility tunnel.  


Subsurface investigation included condition evaluation of existing tunnel, coordination with GPR subcontractor, prepare GPR evaluation report, coordination with drilling subcontractor, prepare Health and Safety Plan (HASP), provide Resident Engineering during drilling, Prepare boring logs, select samples for lab testing, prepare Geotechnical Data Report, prepare geotechnical design memorandum to include final assessment of loads on existing tunnel.  


DUE performed Plexis analysis to assess stress changes within existing tunnel lining due to proposed sequence of construction. Design of foundation alternatives (approximately 120'x60') for new electrical generators and electrical facilities above and adjacent to the tunnel (including slabs on grade, beams and piling).

Northern Boulevard Crossing, MTA Contract# CQ-039, NY

Dawn Underground Engineering, Inc. (DUE) provided expert assistance in reviewing and checking designs and analysis provided by the general engineering consultant for construction of the crossing.


Dawn performed an independent Plaxis analysis for Sequential Excavation Method (SEM) for the crossing excavation with seven (7) cells; reviewed and provided comments on details of design and geotechnical parameters used in the analysis.  


To aid with stability of the excavation for this shallow crossing, freezing of the soil was employed to control ground water inflows and provide added stability for the SEM excavation.  DUE participated in progress meetings associated with coordination of the SEM design and construction requirements.

Structural/Civil

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Rahway Rail Station Rehabilitation, Rahway, NJ

The rehabilitation of the Rahway Rail Station included the demolition of the westbound platform and construction of a new platform on the existing foundation.  However, demolition work revealed that the existing footings were in poor condition.  Several soil borings taken prior to construction indicated that the soil in the area of the platform was mainly fill.  


The poor condition of the existing footings and the poor soil quality required the design and construction of a new deep foundation system.  An H-pile deep foundation system was designed to minimize platform redesign and to be installed without disruption to train service.  The system's design allowed for installation to be completed in a timely fashion, helping to maintain the tight construction schedule of the project. 

PATH Elevator Exchange Place, Jersey City, New Jersey

As part of the continuing improvements, renovations and rehabilitation activity by PATH, this contract required installation of a new elevator to connect the lower and upper train tunnels. The improvements were necessary to provide access for the elderly and disabled. All of the construction is adjacent to existing stairwell, tunnels and passages.  


An investigation was performed of the subsurface conditions and determined the loading support. Utilizing historical data and original 1930 construction drawings, 3-D renderings were developed to investigate conflicts with existing stairwells and prepared detailed design drawings for initial and final supports.

Workhouse Spillway, Hopewell, New Jersey

The spillway constructed in 1913 is placed on the National and New Jersey Register of Historic Places. The spillway is in various stages of deterioration. The structural condition of the concrete was investigated and it was determined that most of the structure components should be demolished and reconstructed in accordance with the New Jersey State House Historic Preservation Office directives. All visible segments of the structures to remain identical in color and dimension to the existing structure after rehabilitation.  


Drawings and specifications were prepared that were approved by the State Historic Preservation Office and the New Jersey Department of Environmental Protection (wetlands and stream encroachment).

Chevron Building Rehabilitation, South Plainfield, New Jersey

Chevron planned to install a new standing-seam metal roof on a warehouse in South Plainfield, NJ.  The new roof added 125,000-lbs. to the building’s roof structure which consisted of long-span heavy timber trusses.  


Dawn Underground Engineering, Inc. (DUE) personnel evaluated the existing wooden trusses performance under the additional load of the new metal roof.  The analysis showed that some trusses required repair prior to the new roof installation.  The design included repair techniques that increased the structural capacity of the trusses enabling them to safely carry the loads imposed by the new roof.

Rehabilitation

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Big Creek Interceptor - Contract 3CR - Cleveland, OH

The City of Cleveland is involved in a major renovation of its aging sewer system. Part of the system is brick and clay tile sewer pipes or tunnels in poor condition.  


Design of initial supports to accommodate safe placement of a lining was required for the restoration of the existing brick and clay tile sewers. Also provided was the design of all work and access shafts supports, final structures and construction administration services.

Restoration of CMP, Jefferson County, Arkansas

Shotcrete lining was required for the rehabilitation of an ageing corrugated metal pipe (CMP) culvert in Jefferson County, Arkansas. Restoration was required to bring the pipe back to its original structural and hydraulic integrity.  


Analysis and design was for a shotcrete liner. The design consisted of a 1.5-in. thick; 5,000-psi shotcrete lining that restored the CMP structural and hydraulic integrity.

Restoration of Existing Brick Sewers, New York, New York

A recommendation for shotcrete lining was requested by the client to rehabilitate existing brick sewers. The shotcrete was to replace the brick as a new lining with full load carrying capacity.       


Several egg-shaped designs were prepared under different cover conditions and different stages of deterioration. The shotcrete thickness was selected to provide full structural stability. A report was prepared to summarize the design and the analysis of hydraulic capacities before and after restoration.urn potential customers into loyal ones.

Rahway Rail Station Rehabilitation, Rahway, New Jersey

The rehabilitation of the Rahway Rail Station included the demolition of the westbound platform and construction of a new platform on the existing foundation. However, demolition work revealed that the existing footings were in poor condition. Several soil borings taken prior to construction indicated that the soil in the area of the platform was mainly fill.  


The poor condition of the existing footings and the poor soil quality required the design and construction of a new deep foundation system. An H-pile deep foundation system was designed to minimize platform redesign and to be installed without disruption to train service. The system's design allowed for installation to be completed in a timely fashion, helping to maintain the tight construction schedule of the project.