Deep Foundation Water Remediation

[ImaCM]

Hello,
I am building a pile supported structure in North East Nebraska. The client wants the Waste Water tank system to be below the basement (and obviously the sump below that). Assuming grade is at 100.0', the water table is at 72.0'. The floor the water tanks is sitting on is at 64.0' and the sump pit is at 57.5'. The steps I have planned are as follows:
1. Multiple layers of drainage pipe with crushed stone,
2. A membrane system below the slab, around the piles/caps, & up the walls,
3. An additive to the concrete to help bonding & eliminate voids,
4. Application of bentonite at all joints,
5. Application of sealant on all exposed surfaces of CIP concrete prior to backfilling.

This is the belt, suspenders, duct tape and bungee cord approach- but the client is ADAMANT that we have no leaks.

Does anyone have experience/ recommendations for item 1 above? I am familiar with the rest- I just want to understand what can be done below the slabs to alleviate hydrostaic pressure.

Thanks.

 

[VoyageofDiscovery]

Hi ImaCM,

I would design the tank system for uplift from bouyant force effects. Drainage systems do not always work the way you want them to.

VOD

 

[civilperson]

Glass fiber reinforced epoxy coating on the exterior is waterproof. Concrete is water resistant,(eventually moisture will migrate through).