#7 Subway Line Extension
Client: Metropolitan Transportation Authority
Location: New York City, New York
Services: Construction Inspection and Document Control Services
Completion Date: 2013
Keville Enterprises is providing construction inspection and document control services as a sub-consultant to the HLH7 joint venture in connection with the $2.1B extension of the #7 Line.
The first construction contract (a $1.145B contract to build 7,000 feet of twin-tube tunnel, from the current #7 line terminus in Times Square and the shell of the 34th Street station near the Jacob Javits Convention Center) is currently underway. After excavating the new terminal's shell and creating the first 1,000 feet of tunnel using the drill-and-blast method, the contractor then placed two tunnel boring machines (TBM’s) through deep shafts to excavate the remaining 6,000 feet; the TBM’s placed pre-cast, gasketed concrete liner segments to create the tunnel interior. Ground freezing was used as a geotechnical technique for controlling water infiltration into the tunnel excavation area. Large diameter shafts were also excavated to provide access for the new 34th Street Station. Extensive geotechnical monitoring devices are utilized to monitor any movement and vibration effects of the excavation operation.
As a sub-consultant on this project, Keville provides construction inspection and document control services for the NYCTA. Daily activities include preparing Daily Progress Reports; taking periodic construction progress photos and special field condition photos; evaluating and processing proposed change orders; processing project submittals and providing weekly verification that the GC is maintaining a current set of as-built record drawings; reviewing the GC’s pay requisitions for accuracy and verifying that actual work has been completed; and ensuring that all daily reports, test results, and all additional reports, records, and documentation are maintained in a complete and orderly manner.