There is speculation among viewers about what is going to be put into the ‘landfill pit’ being built next to the building at Giga Texas. Some say it’s a landfill; others think it’s too shallow for a landfill. I was reading the following article and noticed that the conventional cathode production has a lot of waste water that is left over. Tesla is supposed to switch to the newer cathode production that doesn’t have the waste water. There are two diagrams that show each process in the article. It’s possible that the plant will need the pit for wastewater from the conventional process.
https://cleantechnica.com/2020/09/22/everything-you-need-to-know-about-teslas-new-4680-battery-cell/