Answer: You can expect to find a majority of your cedar tree roots in the top 12-18" of soil, radiating out about twice as far as the dripline. Whether or not the orange-colored root is from one of your cedars is hard to say. You could dig under the root and pull on it to see where it travels. I suspect, from the coloration, that it's probably from a cedar and not from avocado, citrus or guava, but the only way you'll know for certain is to dig it up. Best wishes with your landscape!
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