Phase II, Dulles Metro Rail

The Dulles Corridor Metrorail Project (DCMP) is undertaken by MWAA in partnership with Fairfax and Loudoun Counties, as well as the Commonwealth of Virginia.  Phase 2 of the DCMP starts from the Wiehle-Reston East Station and will extend the Silver Line 11.4 miles west into Loudoun County, VA.   It will include six new stations, Reston Town Center, Herndon, Innovation Center, Washington Dulles International Airport, Route 606, and Route 772 Ashburn. Five of the new stations will be built on ground level.  An aerial station will be constructed at Dulles International Airport.


DMY is currently working on this project providing both field and engineering services including geotechnical drilling, rock coring, rock pressuremeter tests and data analysis, borehole logging and field work coordination.  Special challenges include very stringent drilling fluid and siltation control requirements, complex field work coordination with the Design-Builder, MWAA, VDOT and other team members.  DMY, as one of the few geotechnical companies with the expertise of rock pressuremeter testing and data interpretation, successfully performed rock pressuremeter tests in boreholes down to 65 feet deep in challenging geological conditions and obtained valuable data to support the deep foundation design.


Project Location  –  Fairfax and Loudoun Counties, Virginia

Project Owner  –  Metropolitan Washington Airports Authority (MWAA)

Project Client  –  Capital Rail Constructors/Schnabel Engineering

Project Completion  –  2018 (projected)






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Carter G. Woodson Park

This project involved the construction and improvement of an existing park located on the triangle formed by the intersection of Rhode Island Ave, 9th St, and Q St NW in Washington, DC. Several large trees surround the park along Rhode Island Street NW and 9th Street NW, while smaller trees are planted along Q Street NW. The site is flat and has an elevation of EL 81 ft.  The construction consisted of improving the park with a statue and memorial honoring Carter G. Woodson at its center.  In addition, paver sidewalks were installed, along with a rain garden to serve as an infiltration facility for the site.


DMY’s scope of services included reviewing project information, obtaining the drilling permit from the DCRA and DDOE for field work, drilling borings and performing field infiltration tests in the cased borehole, evaluating field infiltration testing data and preparing a report.


Project Location – Washington, DC
Project Owner – District of Columbia Department of Parks & Recreation
Project Client – Lee & Associates, Inc.
Project Completion – 2013











Justice Park Residential Redevelopment

The project consists of demolishing the existing Justice Park and constructing a new five-level residential building with a partially below grade parking and a penthouse for mechanical equipment.  The footprint of the proposed building is approximately 85 feet by 145 feet with a gross floor area of about 50,000 SF.  DMY provided geotechnical engineering services including soil test drilling and sampling and provided geotechnical recommendations.


DMY worked closely with the environmental consultant to implement a combined field program consisting of geotechnical exploration and a Phase II ESA sampling and testing to reduce the overall design costs.   Prior to contract award, DMY performed a comprehensive site reconnaissance and prepared numerous alternatives for site access and subsurface exploration.  DMY also assisted the design team with local engineering requirements as well as concerns unique to the site, which the client was not aware of.  This early and active involvement in the project beyond just the geotechnical engineering scope provided the client foresight to avoid potential pitfalls and ensured a smooth project design and development process.  DMY also worked closely with the structural engineer and ultimately recommended supporting the proposed building on shallow foundations bearing on compacted aggregate piers to save time during construction, increase footing bearing capacity, and reduce potential long term risks to the proposed building and the adjacent structures.


Project Location – Washington, DC

Project Owner – District of Columbia Government

Project Client – Dantes Partners

Project Completion – 2013











Simon Elementary School

This project used geotechnical engineering services to support the design of the Simon Elementary School Playground project in Washington DC.  The new features included two rain gardens, two bioswales, pavement areas, trails and an amphitheater. A total of seven infiltration tests were conducted for the rain gardens and bioswales. Infiltration test borings were drilled to about two feet below the anticipated facility bottom to perform the field infiltration tests. DMY also drilled four soil test borings varying from 5 to 10 feet in depths at the pavement and amphitheater locations.  Subsurface soil/rock and groundwater conditions were obtained at each of the boring locations. Standard Penetration Tests (SPT) were conducted in all the borings to check for soil strength.


DMY provided geotechnical engineering services on this DGS/DDOE/DCPS pilot program.  As part of initiatives to rehabilitate local rivers, Simon Elementary School Playground renovation project served as a pilot showcasing opportunities for marrying play and sustainability. The proposed construction reduces pavement and introduces rain gardens for cleansing and infiltration, and incorporates a variety of play features including a basketball court and hard surface play areas, play equipment, and climbing mounds.



Project Location – Washington, DC

Project Owner – DC Public Schools

Project Client – LandDesign, Inc.

Project Completion – 2013