A minimum of 50% of the critical root zone must be preserved at natural grade and with natural ground cover. No cut or fill, any deposit or stockpiling of earthen materials in their natural state, greater than four inches will be located closer to the tree trunk than one-half the CRZ radial distance. If more than 50% of the tree's critical root zone is affected by construction the tree may be preserved but replacement plantings must be met as part of the mitigation requirements in accordance with § 150.782 and § 150.783.