11 ATTACHMENT 04 - Laserfiche WebLink

Tree Preservation Report, 4171 &4189 Stanley Blvd. Ed Brennan, Consulting Arborist January 9, 2009 Page 6 Tree Preservation Guidelines Trees#69 and 70 have been designated for preservation based on their suitability for preservation and location relative to the development plan. The following recommendations will help reduce impacts to trees from development and maintain and improve their health and vitality through the clearing, grading and construction phases. Design recommendations 1. For design purposes the TREE PROTECTION ZONE shall be defined at the edge of the dripline. No grading, excavation, construction or storage of materials shall occur within that zone. When trunks are accurately located and development plans refined, the Consulting Arborist will identify specific TREE PROTECTION ZONES for each tree. 2. Tree Preservation Notes, prepared by the Consulting Arborist, should be included on all plans. 3. Any herbicides placed under paving materials must be safe for use around trees and labeled for that use. 4. Irrigation systems must be designed so that no trenching will occur not within the TREE PROTECTION ZONE. Pre-construction treatments and recommendations 1. The construction superintendent shall meet with the Consulting Arborist before beginning work to discuss work procedures and tree protection. 2. Fence trees to enclose the TREE PROTECTION ZONE(leaving space for pedestrian entrance) prior to demolition, grubbing or grading. Fences shall be 6 ft. chain link. Fences are to remain until all grading and construction is completed. This is the standard requirement in Walnut Creek. Recommendations for tree protection during construction 1. No grading, construction, demolition or other work shall occur within the TREE PROTECTION ZONE. Any modifications must be approved and monitored by the Consulting Arborist. 2. Grading within the dripline of any tree shall be monitored by the consulting arborist. 3. Any root pruning required for construction purposes shall receive the prior approval of, and be supervised by, the Consulting Arborist. 4. Supplemental irrigation shall be applied as determined by the Consulting Arborist. 5. If injury should occur to any tree during construction, it should be evaluated as soon as possible by the Consulting Arborist so that appropriate treatments can be applied. 6. No excess soil, chemicals, debris, equipment or other materials shall be dumped or stored within the TREE PROTECTION ZONE. 7. Any additional tree pruning needed for clearance during construction must be performed by a Certified Arborist and not by construction personnel.