Sovereign Group of Companies
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Salt Mine Bulkhead Sealing Test In Kansas
Dear Mr. Vandyk,

Sovereign Hydroseal provided the critical sealing system and sealant for Sega's full-scale test of a large, concrete air pressure bulkhead in a salt mine in Western Kansas, USA. The installation and testing took place in 2008 and 2009. Our test was successful, thanks to your and Sovereign Hydroseals technical expertise, superior product, and efforts to develop a seal for this unique bulkhead.

I would also like to complement your in-mine supervisor, Josh Minturn, for his contributions to the success of this project. Josh supervised and assisted with the installation of the injection system piping and the sealing compound. His many weeks of work in a challenging environment, including scheduling activities to avoid affecting on-going salt mining operations, were important to the bulkhead installation and testing success.

Bruce J. Schaller, P.E.
Vice President
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