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Any capped landfill has to be kept free of any trees, etc. that would breach the waterproof cap. That is critical to keeping any of the myriad of unknown *stuff* that got deposited there over the years from leaking out into the groundwater.
The system that is pre-engineered for this solar array "floats" on the surface and does not penetrate the cap with foundation footings. So it maintains the required function of open land for the purposes of protecting the landfill.
Does that make it clearer?
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