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Section E4b, Greenbelt Route, New Hampshire Avenue
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| Service: | NATM Consultant
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| Estimated cost: | Commencement: | December 29, 1994
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Completion date: | December 29, 1996
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| Location: | Washington, DC United States |
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| Technical data: | Two 20 ft diameter, 3.050 ft long with a minimum overburden of 45 ft and one elliptical shaft excavated and supported according to the principles of NATM as part of the Section E4b. Horizontal grout umbrellas up to 400 ft in length were installed as pre-support at the portals. |
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| Geology description: | Potomac Group Soils, compact to hard; comprising silty fine to medium sand with some gravel and hard silty clay. |
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