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Old 08-01-2011, 03:15 AM
53 posts, read 97,241 times
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I believe this is the Coyote Canyon fill location.

Google Maps

Anyone really gonna say that's good engineering/planning to have homes and schools right there?

I don't think we need to do any measurements to see the facts here.
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Old 08-01-2011, 08:52 AM
Location: Grosse Ile Michigan
26,424 posts, read 62,653,352 times
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It is reasonably common to turn a landfill into a park after it is closed, capped, and they have siphoned off the methane for a while. In various locations I have seen them used as parks and playgrounds, ski hills (in cold places), residential building sites, and frequently parking lots. I have heard that they have even build schools and hospitals on top of landfills, but i have never seen this, but there is no reason to doubt it.

They cap the landfill with as much as 60 feet of clay. They give it years to settle and siphon off valuable methane gas from rotting organics. Then they turn it into something. They are not just going to leave a giant piece of real estate sitting there unused, especially when the area explodes like OC did and the lad become worth $1 million per acre or more. I am aware of several housing project in southern CA where they build at least partially on top of former landfill facilities. The have to dig out to a certain depth, clean out anything that is not inert and then re-compact. Inerts like broken concrete, asphalt, tires and the like are often left in place, or just re-compacted back into the fill. They do not always remove the entire landfill, but try to get most of it. There are several places that I know of where the owners of some pretty fancy homes would be surprised that they are sitting on top of the former municipal dump (Inland Empire, not OC but there are probably such sites in OC as well, I just do not know of them, most of OC was built out before my involvement in the Construction industry).

Keep in mind that there are many different types of landfills. Some accept only inerts and if they compact the fill properly can be built on when completed. Some accept a limited amount of non-inert materials, some accept general trash and some accept chemicals and toxics (special locations). I woudl not buy a ouse on any type of fill in CA, but if I did nto ahve that restrictions, I woud not worry overly mcuh about being over an inert landfill. Some people would say that you never now whaat else may have bene dumped there illegally. However that is true of any buidling site. In fact dumps may be safer becuase they are watched for what is being dumped and a big empty lot that is not a dump is not watched.
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