Saanich EDPA

We are property owners in Saanich. The property has been owned by the family for fifty- five years. The EDPA restricts our ability to subdivide one legal lot off.
In the last twenty years two large oaks have blown down. We had found grubs in the root systems that hollowed out the root systems. The present health of our remaining oaks are showing signs and symptoms of poor health.
The oak trees have been stressed by green worms. We have noticed the first set of leaves almost completely disappear. Each year for the past few years new leaves do grow back. Branches of the oaks are dying.
We think a tree biologist could assess the health of our oak trees. In so doing the tree biologist may determine if current measures at oak protection by the EDPA are too little too late?