Is this an old septic tank? Do I need to do anything? Can I put a stone patio over it? : HomeImprovement

I am on the process of excavating for a flagstone/gravel patio for a hot tub. The hot tub will not end up over this object. I found it about 6-8 inches below the surface, about where I planned to excavate to.

I found the clean out first. About four inches lower I found a concrete box roughly four feet wide, still not sure on length.

Can I just throw the weed barrier over this, then put my gravel/sand/stone down? I was going to cover the clean out with a hollow fiberglass rock, but now I am wondering if I should just cover it all together.

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