Critical Root Zone Work Authorization (CRZWA)
A Critical Root Zone (CRZ) Work Authorization is required for any construction activity that takes place within the CRZ of any on and off site trees. The CRZ of a tree is the dripline + 4m or DBH x 6 + 4m, whichever is greater. Construction activities include but aren’t limited to excavation, demolition, construction, fill or engineering works, trenching, landscaping, installation of irrigation, hard-scaping, utilities and services upgrades or repairs, etc.