Could have been accumuluted via buildup from years of using
synthetic fertilizers that were sourced by the companies that
sold them from industrial waste (or even mostly organic fertilizers
that had a "micronutriet additive" sourced from industrial waste).
Do a www search for "Bay Zinc" and "fertilizer" some time to
grasp the true scope of the problem.
Remediation usually is a process of growing trees in the soil
that will take up excess zinc, lead, cadmium, etc, then
harvesting the trees and disposing of them.
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