The root crown is set one inch above the surrounding finish grade on a mound of undisturbed or compacted native soil. The tree rootball sits in a pit excavated to three times the rootball width with scarified sides. Backfill consists of organic amendment installed in six-inch lifts and watered to settle. For trees in lawn areas, a temporary earth berm is maintained through the end of the maintenance period and a minimum two-foot diameter open area is kept around the tree well. If the tree hole does not drain, a twelve-inch diameter rock sump is installed two feet six inches deep below the bottom of the planter hole, filled with three-quarter-inch gravel, and covered with filter fabric. Tree stakes are installed on either side of the rootball.
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