In Seattle, we have a similar program. The tree comes with a donut-shaped water bag for twice weekly watering during the dry summer, and instructions for tree care for those first 5 years. The main takeaways I got were: don't bury the trunk (the top of the root system should just barely be above the dirt line) and amend the tree maybe once a year with coarse wood or bark mulch, leaving a couple inches of space around the trunk. Three years in, my tree seems to be flourishing.