METRO CONSTRUCTION ACTIVITIES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-05927A000100070007-5
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 1
• Document Creation Date: December 9, 2016
• Document Release Date: January 7, 2000
• Sequence Number: 7
• Publication Date: June 27, 1972
• Content Type: BULL

Approved Fair Releaser2000/08/30 : CIA-RDl 78-059274000100070007-5
A
EMPLOYEE INFORMATION CIRCULAR (Rosslyn Area)
SUBJECT: Metro Construction Activities
li 't ,itlie "~3
1. As most employees in the Rosslyn area have been trade "explosively"
aware, the Bechtel Corporation is in the process of constructing portions of the
Metro system in the Rosslyn area. The construction activity includes excavation
of the main tunnel (under North Lynn Street), plus supporting structures.
2. The method of excavating for the Metro subwr:ty in the area involves
the use of explosives because the tunnel must go through rock in this area rather
than soil. The work requires that an access tunnel be excavated from in front of
the Ames Building down to the underground Rosslyn Station where the excavation
will change direction. to follow the future train route. Additionally, a vertical air
vent will be constructed directly across the street from the Magazine Building.
. 3. During this current phase of excavation of the vertical access to the
station, engineers, technicians, and others representing the Ames Building ov,ner,
Metro, and the Agency have monitored the effects of the blasting shock on the Ames
Building using a seismograph. This instrument indicated that the blasting has had
no effect on the building's physical integrity and has, in fact, hardly begun to use
the strength designed into the building for such protection against blasting, earth-
quakes, or win l forces.
4. The tunnel excavation is now proceeding away from the Ames Building
and the concussive effect of the blasting should begin to diminish gradually. Until
that time, this building will continue to be monitored to ensure the safety of the
Agency's employees.
5. Plans of the construction are available in the Real Estate and Construction
Division, OL , 906 Ames Building, if any interested personnel wish to see them.
Additionally, subject to ongoing workload, engineers of this Division are available
to answer specific inquiries involving the Metro construction activities.
6. Continuing liaison is being maintained with the Metro supervisory engi-
neers; subsequent circulars will be issued covering schedules, progress, and other
items of general interest.
25X1A
of
Chief
Real Estate and Construction Division
Office of Logistics
Approved For Release 2000/08/30 : CIA-RDP78-05927A000100070007-5