Contractor Talk - Professional Construction and Remodeling Forum banner

Looking for Ideas for an excavation

5033 Views 26 Replies 13 Participants Last post by  Upchuck
I am getting ready to bury a 10,500 gal water tank for a fire suppression system. The tank is going in the ground 9' from an existing building, the top of the footing is 5'8" below grade(1 foot footing). The dimension of the tank is 13'2" top to bottom, with either 12" of stone under it or on undisturbed soil, there is a 4' round sump station located 5-10' away from it/building that is 4'8" deeper than the bottom of the tank.
My question is this: the tank was supposed to go in back in the early part of sept when the water table was much lower, but the engineers and precast co have been redesigning if for the last month and a half and the water table is up substantially, finish grade on top of the tank is 410' and the water table is at 394.
I need to make sure that the building does not shift but with the water up I am worried about the 45* slope leading up to the existing footing is going to undermine. Driving sheet piling will cost 22K, I was going to underpin the corner originally, but with the water up that doesn't seem like a good idea. I obviously will de water and drop the table some, but am nervous about the proximity of the building. It is up to me for BMP to design the support.
Any ideas?
to add insult to injury the engineers wont answer the questin how much ground cover over the tank.:laughing: I guess it is not that important

Thanks in advance.
1 - 3 of 27 Posts
I personally love to use the slide rail boxes, they are great when doing these types of large tanks. The engineer isn't telling you any specifics of what they want for the existing buildings footing for support? Also, def recommend you establish a dewatering well of some sort with a large pump. Fortunately i have access to a 6" centrigual diesel pump that pumps ungodly amounts of water hehe.
Good deal, thats why i was kinda wondering if the engineer was looking to add any input to the matter.

I find it to be incredible the amount of mistakes you will find on a set of big site plans made by the engineers. I mean the plans are even signed off by the chief engineer after they are drawn up by the drafter. The second thing that always bugs me is that these guys draw up these insane contour lines, we just look at them and laugh.... ok so you want the water to go that way, ok lets see, lets take this contour line with its 100 bends and jigs and jags and make one nice straight one. Aaaaaaah, nice.
I def agree as well with working the engineers. I have a few friends who are civil engineers as well, i'm also two years into my associates in civil. They really need to get these kids that are straight out of school onto some jobsites and watch the operations.
1 - 3 of 27 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.