Suggestions for Cistern Riser & Cap

[Buckaroo5]

At my cabin, I have an old concrete cistern and the top lip of the concrete riser has crumbled to a couple inches above ground level. At one point, a gap exists between the lip and the concrete cover and I am concerned about entry of ground water. Also, the lip on the opening into the cistern at the bottom of the riser has eroded - not sure if I have to worry about the concrete cap falling in. Suggestions on best way to address this? Maybe just patch the top lip of the riser with concrete or mortar? Or dig it out and replace? I am a little concerned about how I get that heavy riser out of the hole. If I replace it, do I install concrete like the old or get a poly riser and cap? It would be great if I could get a poly sleeve to go around the outside of the riser and caulk that into place with a poly cap. What do you guys suggest? Maybe something like this?

https://www.amazon.com/dp/B083SSWWG4/?tag=atomicindus08-20

Thanks!

 

[AC-WC]

Yes, what you found on Amazon is perfect. The bottom ring gets sealed to the tank. and the column gets screwed to the flange/seal. You will have to dig down to the surface of the cistern and clean off all the dirt to seal properly.

 

[Buckaroo5]

Yes, what you found on Amazon is perfect. The bottom ring gets sealed to the tank. and the column gets screwed to the flange/seal. You will have to dig down to the surface of the cistern and clean off all the dirt to seal properly.

Rather than sealing it to the tank, I would like to seal it to the top of the existing concrete riser?

 

[ncornilsen]

For your safety and that of your loved ones, get a better lid. fiberglass ones like this one made by Orenco are incredibly strong.

Pace Supply | Tank Solid Lid, 21 in Dia, Fiberglass

OSIFL21G Tank Solid Lid, 21 in Dia, Fiberglass

pacesupply.com

 

[AC-WC]

Rather than sealing it to the tank, I would like to seal it to the top of the existing concrete riser?

If you are concerned about ground water getting to the cistern you need to seal the tank connection 1st. That is where the ground water will seep into. The actual cover on top is a fairly minimal for leakage unless you have a flood that covers the lid.

I have an almost identical situation for a septic tank and the riser isn't fitted/sealed to the tank. My concrete lid covers the top well. By code 30 yrs ago and grandfathered in so not an urgent thing for me.

 

[Buckaroo5]

For your safety and that of your loved ones, get a better lid. fiberglass ones like this one made by Orenco are incredibly strong.

Pace Supply | Tank Solid Lid, 21 in Dia, Fiberglass

OSIFL21G Tank Solid Lid, 21 in Dia, Fiberglass

pacesupply.com

Will look at it. thx...