Project: Minnesota Reservoir


October 24, 2019


The last newsletter showed the walls being completed on the Minnesota Reservoir. Since then, the roof was poured and cured, and the reservoir’s exterior walls were coated with shotcrete. After the first shotcrete coat, the reservoir was wrapped with 35,000 feet of 3/8-inch steel strands from top to bottom. Once wrapped with steel strands, a final layer of shotcrete was applied to the exterior walls. The shotcrete machinery was temperamental and created some delays for the crews. However, once it was up and running, the final shotcrete layer was completed. Final plumbing connections were made, the interior of the reservoir was thoroughly cleaned and disinfected, and the reservoir was then filled over a three day span. Once the reservoir was full, a water sample was taken to confirm the water quality was satisfactory, and then a leak test was performed. The water sample was satisfactory, so it was on to the leak test. A leak test begins by measuring from the top of the reservoir roof to the water surface level, and then the reservoir sits for 7 days, completely isolated from the water system. At the end of 7 days, another measurement was taken and the water level had to be within 13/16-inches from the first measurement for the leak test to be successful. At the end of the 7 day wait, the measurement was taken and the leakage was only 1/4-inch, making the leak test successful. This means we were able to put the reservoir on-line and into service on Monday, September 9, 2019 at 10:30 a.m.  Nob Hill Water will be working on completing the site landscaping as weather allows.

We are very proud of our new reservoir and would like to thank the following people: RH2 Engineering for the design and amazing construction oversight of the reservoir; Rotschy, Inc. who was the general contractor for the project and completed the demolition of the old reservoirs; and Ward-Henshaw who was responsible for the construction of the new reservoir. Great job everyone! The project was completed approximately 7 to 10 days beyond of the expected completion date, but the project came in on budget thanks to a team effort.

Also, a huge thank you to all of our neighbors who dealt with the construction noises while this project was underway.  We truly appreciate your patience!

                                   2017                                                                                                             2019  


Next Comes The Roof

June 06, 2019

The walls are now complete as are the columns inside the reservoir.  Crews have been busy building the forms for the roof of the reservoir.  The roof pour will mean an early start time of 5AM on June 14th, with concrete starting to be poured at 6AM.  The concrete must be poured before the temperature gets to 85 degrees to facilitate the proper curing of the concrete with additives to the concrete mix.  Once the concrete is poured, sprinklers will be set on top of the reservoir, again, so that the concrete can cure properly.  Once the roof is poured, there will be about a two week down time as we wait for the roof concrete to cure and reach adequate strength.  Once cured, all of the internal forms that are holding the roof in place will be removed by crane, through a hatch in the roof.

Then, around July 8th, DN Tanks will arrive on site and will begin to prep to "wrap" the reservoir exterior with wire strands.  Once the reservoir is wrapped, a layer of shotcrete will be applied to the exterior wall, and then it will be time to disinfect and perform a leakage test to ensure the reservoir does not have leakage.  Once that is complete, the reservoir will be put back in service. 

Again, thank you to our neighbors for dealing with the construction.  We are getting closer to completion!


You can see the forms inside of the reservoir.                                                                                     Can you see the forklift being lifted inside the reservoir?


Once forms were installed inside, time to frame up the roof.                                                     Laying down the roof framwork.


Scaffolding inside the reservoir.  The light from above is the hatch area.                                  Another scaffolding picture.


April 08, 2019

The forms are being built for the walls.  There is an inner and an outer form and in the middle ~ re-bar.  The walls will be poured in 8 different sections.  Section #1 is scheduled to be poured this Friday, April 12 starting at 10 am.  It is anticipated that there will be 4 concrete trucks to pour this section. Each wall section thereafter is scheduled to be poured every 2-3 days as they work their way around the floor.  While pouring the outside walls, the crews may choose to start work on the columns inside of the reservoir as well.    Once the columns are finished, then the last section of wall (Section #8) will be poured. It is anticipated that work on the walls and columns will continue until mid to late May.   When the walls and columns are complete, then the roof work will begin.            


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Minnesota Reservoir Updates by Date

November 2018 (3 posts)
October 2018 (2 posts)
September 2018 (2 posts)
August 2017 (1 post)
June 2017 (1 post)
April 2019 (2 posts)
March 2019 (2 posts)


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