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Cutting Edge Field Trips


Get inspired by participating in our off-site field trip and technical tour. Learn how others in the tunneling industry are improving methods, overcoming obstacles and reaching operational goals.

Field trips are subject to cancellation based on limited attendance. Make your reservations for field trips during your conference registration.

Tour attendees will have transportation and appropriate food and refreshments while on the tours. Tours usually include an opportunity to leave the busses and get an up-close look at the project with guidance from project managers.

Northeast Boundary Tunnel Segments Factory

Wednesday, June 27, 2018 | 12:00 PM – 5:00 PM | $25


Busing and onsite lunch provided by DC Water/ Lane-Salini Impregilo Joint Venture

The purpose of this field trip is to visit the concrete tunnel segment factory for DC Clean Rivers’ (DCCR) $580M Northeast Boundary Tunnel. The NEBT is part of the DCCR Combined Sewer Overflow (CSO) Long Term Control Plan that will reduce CSOs to the Anacostia River by 98% and reduce flooding in the Northeast and Northwest parts of the District of Columbia. The NEBT Project comprises 27,000 feet of 23-foot internal diameter soft ground tunnel ranging in depth from 80 to 160 feet. The project also includes seven deep shafts, five diversion chambers, seven adits, several stormwater inlets, two ventilation control vaults, and an 80,000 cfm above grade and two 3,000 cfm below grade ventilation control facilities.

The field trip is intended for engineers, contractors, and owners. The scope of the field trip is to expose the audience to the process followed to manufacture high quality segments for tunnels operated under severe environmental conditions. The audience will witness the segment manufacturing process. The process elements covered during the tour will include: the preparation of the moulds, concrete batching with fibers and delivery to moulds, the finishing of concrete, the curing of concrete, de-moulding, and the stacking and final finishing of segments, secondary curing, yarding, and testing.

Attendees should wear appropriate seasonal casual clothes and steel toe boots. The site will provide PPE including hard hat, gloves, reflective vest, safety glasses, ear protection, and dust mask. Attendees will need to wear steel toe boots.

Maximum registration: 40 people

DC Water 250 MGD Tunnel Dewatering pump station

Wednesday, June 27, 2018 | 12:00 PM – 4:30  | $75


The purpose of this field trip is to tour DC Water’s new 250 mgd Tunnel Dewatering Pumping Station (TDPS) and screening devices constructed at the terminus of Blue Plains Tunnel on top of the 132ft and 76ft internal diameters respectively. The TDPS allowable minimum firm discharge capacity is 225 mgd, which is equal to the capacity of the Enhanced Clarification Facility (ECF). The TDPS is expandable to 500mgd. In addition, the facility will have the ability to dewater the tunnel the system up to the new ECF and be able to discharge ECF effluent to complete treatment and discharge at Outfall 002 or at Outfall 001.

The field trip is intended for engineers, contractors, and owners interested in the processes used for treatment of Combined Sewer Overflows to meet the Water Quality standards. The audience will be exposed to the coarse screens at the tunnel terminus, pumps and their controls, fine screens, grit removal process, high rates clarifies, etc.

Attendees should wear warm, casual clothes. The site will provide PPE hardhats if needed.  No other gear or equipment is needed.

Maximum registration: 40 people

Purple Line Tunnel Project

Wednesday, June 27, 2018 | 12:00 PM – 3:00 PM | $75


The Plymouth Tunnel constructed under the Purple Line Light Rail P3 project by SEM is a single tube for twin-track light rail vehicles and has length of approximately 1,000 LF. The design-build contractor are the Purple Line Transit Constructors, an entity consisting of Fluor, Lane Construction, and Traylor Brothers.

The visitors will be able to attend a brief presentation on the specifics of the ground support measures in place for tunnel excavation and means & methods selected by the contractor followed by a tour on the surface to get an impression of the site setup and logistics related to SEM tunnel construction. A tour inside the tunnel might be possible as well depending on the type of activity performed at the time of the visit.

Attendees should wear warm, casual clothes and steel toe shoes/boots. The site will provide PPE.

Maximum registration: 24 people, two groups of 12

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