We live on 5 acres in the Gulf Coast region of Texas, Zone 9.
We currently raise khaki campbell ducks for eggs and GCN sheep for meat and wool while training a ewe lamb for milking. Our gelded guard donkey produces great manure. Currently planning to plant fruittrees guild-style with native elderberries this autumn. We still need to select nitrogen-fixing undergrowth and narrow down the species of tree we want to plant, though pawpaw is definitely on my list.
The house came with a producing pear tree, and a large, messy cache of lead arsenate in the garage. The lead arsenate was removed from the garage by the local fire department, but I don't know its impact on the land. Is this something I should be worried about?
Regarding the lead arsenate and whether you should be concerned, maybe.
According to wikipedia, "Lead arsenate was widely used in Australia, Canada, New Zealand, US, England, France, North Africa, and many other areas, principally against the codling moth. It was used mainly on apples, but also on other fruit trees, garden crops, turfgrasses, and against mosquitoes." It was discovered that it built-up in produce, so was eventually replaced with...DDT!
If you think there is a chance of lead and arsenic, have the soil from several areas tested.