Chances are they can get some if not all of those other amendments there. A lot of the lava that is used in landscaping and ground for lava sand comes out of Northern Mexico, is transported through Arizona, and out to the U.S. If we can get it here in Texas, surely they also transport it west into California! (Northern California is part of that geologic Pacific Rim of Fire and has a lot of volcanoes, so they probably don't need to import lava sand from anywhere.)
Meanwhile, getting them to do what they can is better than doing nothing. Mix good topsoil with compost and the amendments they CAN get, and work from there, adding each year and as the budget allows.
_________________ Northwesterner
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