1. To encourage a diversity of species when four or more trees are required as mitigation, no more than 25 percent of trees planted as mitigation shall be of any one species. Use of native trees where appropriate is encouraged;

2. All replacement trees shall be appropriately chosen for the site conditions (especially soil and hydrology) from an approved tree species list supplied by the city, and shall be State Department of Agriculture and American Association of Nurserymen (AAN) American Standards for Nursery Stock (ANSI Z60.1) for top grade;

3. All replacement trees shall be two-inch caliper. The planning official or planning commission may allow the use of replacement Oregon white oaks and other native trees with the largest available nursery stock if two-inch caliper trees are not available;

4. Replacement trees shall be planted prior to plat for land divisions and prior to issuance of final certificate of occupancy for other applications. Mitigation requirements shall run with the land until all required mitigation has been completed;

5. Replacement trees must be staked, fertilized, mulched, and irrigated as necessary to ensure survival; and

6. Trees planted as mitigation for a Type C permit shall be guaranteed by the permit grantee or the grantee’s successors-in-interest for three years after the planting date through an irrevocable development agreement.

1. Relocation or Replacement Off Site. If in the opinion of a certified arborist or landscape architect there is insufficient available space on the subject property to accommodate the required mitigation plantings, the following alternatives may be used to fulfill mitigation requirements: