Sovereign Group of Companies
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Completion of Water Sealing Product Trial (Sovereign), Slurry Wall Repair Panel 109A Contract CQ031 – Queens Bored Tunnels and Structures

Dear Mr. McIIhinney,

GTF subcontractor Sovereign has performed the test grouting program at Panel 109A on March 1st , 2011 through March 3rd , 2011 as directed in REC – 1862. The purpose of the trial was to reduce the flow of water into the open-cut by least 75%. After completion of the injection of colloidal emulsion (and cementitious grouting of the concrete collection box), the pipes collecting the water from the interface of Panel 109A yielded negligible inflow. Based upon these results, MTACC considers the trial program to be successful and that Sovereign, under the supervision of GTF, have met their technical obligations of the trial by reducing the groundwater inflow to within agreed quantities.

MTACC would like to engage Sovereign (via GTF) to carry out further work to mitigate groundwater inflows at other locations around the open – cut.

Michael A Piepenburg
CQ 031 Construction Manager
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