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2. Whitefish Bay works to fix sinkhole, warns that aging ...

   www.aol.com/whitefish-bay-works-fix-sinkhole...

   The sinkhole was caused by the collapse of a storm water utility outfall pipe, part of the village's primary storm water conveyance, 70 feet below the surface of Buckley and Big Bay Parks.

3. Old utility pipes a suspect in 'significant' Whitefish Bay ...

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   Repair won't be a quick fix or an easy endeavor Around 70 feet below the park grounds where the sinkhole occurred is the stormwater outfall pipe that drains between 15% and 20% of the village's ...

4. Sinkhole - Wikipedia

   en.wikipedia.org/wiki/Sinkhole

   The Red Lake sinkhole in Croatia. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are also known as shakeholes, and to openings where surface water enters into underground passages known as ponor, swallow hole or swallet.

5. Double check valve - Wikipedia

   en.wikipedia.org/wiki/Double_check_valve

   A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.

6. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   A trap primer automatically injects water into a trap, maintaining a water seal to keep sewer gas out of buildings. It must be installed in an easily accessible place for adjustment, replacement, and repair. A trap primer, a specialized valve, is usually connected to a clean-water supply in addition to a DWV system. [20]

7. Large sinkhole caused by water main break closes street in ...

   www.aol.com/large-sinkhole-caused-water-main...

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