The critical root zone of the elm right now is partly a parking lot. There's pavement and cars parked there. The rest of it, up until very recently, was very publicly accessible. There's a lot of foot traffic and a lot of vehicular traffic right around it, so that will cause compaction of the soil. The remediation is basically to loosen up the soil to allow for more oxygen penetration and to make it more available to the tree that way.
On April 2nd, 2019. See this statement in context.