State Street Bridge, New Haven, CT Cost: $25M | Project Area: 88 feet

State Street Bridge construction project had a few unexpected conflicts found during construction: 42" water main over the river had to be replaced, pilings were found for the I-91 bridge above, which were in the way of some of the planned construction; soil and groundwater contamination, settlement due to the vibrations of the 1-91 bridge and some other utilities in the area.

Task:
Provide survey control, pile layout, bridge monitoring and utility system monitoring during construction

Challenge:
Provide daily (Monday through Friday) monitoring survey
Phase One - 17 existing monitoring stations
Phase One - 13 bridge and 4 utility monitoring points at a frequency defined by the specifications
Phase Two - 25 existing monitoring stations
Phase Two - 17 bridge and 8 utility monitoring points

Solution:
Provided daily monitoring survey
Utilized existing control network previously established by others, and established new control points to more easily provide the subsequent layout and bridge/utility monitoring survey services
Performed layout and construction staking of the horizontal position of all the piles during Phase Two
Bridge/utility monitoring survey documented horizontal and vertical locations of said stations accurate to the nearest one-hundredth of a foot
Data gathered using a Topcon Total Station and Data Collector
A summary report for all reporting stations was sent via e-mail daily to the contractor and ConnDOT’s representative
Work was performed under the supervision of and documents sealed by a Connecticut licensed land surveyor