18 ATTACHMENT 09 - Laserfiche WebLink

DRAFT Preliminary Arborist Report Hor1Science,Inc. Valley Trails,Ponderosa Homes Page 10 Pre-construction treatments and recommendations 1. The demolition contractor shall meet with the Consulting Arborist before beginning work to discuss work procedures and tree protection. 2. Cap and abandon all existing underground utilities within the TPZ in place. Removal of utility boxes by hand is acceptable but no trenching should be performed within the TPZ in an effort to remove utilities,irrigation lines,etc. 3. Fence trees to completely enclose the TREE PROTECTION ZONE prior to demolition,grubbing,or grading. Fences shall be 6 ft.chain link or equivalent as approved by the City of Mountain View. Fences are to remain until all construction is completed. 4. Trees to be preserved may require pruning to provide construction clearance. Currently off-site trees#245 and 247 have been identified as requiring pruning. Pruning of off-site trees should be performed with the property owner's permission.All pruning shall be completed by a Certified Arborist or Tree Worker. Pruning shall adhere to the latest edition of the ANSI Z133 and A300 standards as well as the Best Management Practices—Tree Pruning published by the International Society of Arboriculture. 5. Structures and underground features to be removed within the TREE PROTECTION ZONE shall use the smallest equipment,and operate from outside the TREE PROTECTION ZONE. The consultant shall be on-site during all operations within the TREE PROTECTION ZONE to monitor demolition activity. Recommendations for tree protection during construction 1. Prior to beginning work,the contractors working in the vicinity of trees to be preserved are required to meet with the Consulting Arborist at the site to review all work procedures,access routes,storage areas and tree protection measures. 2. Fences have been erected to protect trees to be preserved. Fences define a specific TREE PROTECTION ZONE for each tree or group of trees. Fences are to remain until all site work has been completed. Fences may not be relocated or removed without permission of the Consulting Arborist. 3. Any excavation within the dripline or other work that is expected to encounter tree roots should be approved and monitored by the Consulting Arborist. Roots shall be cut by manually digging a trench and cutting exposed roots with a sharp saw. The Consulting Arborist will Identify where root pruning is required. 4. 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 5 Prior to grading,pad preparation,excavation for foundations/footings/walls, trenching,trees may require root pruning outside the TREE PROTECTION ZONE by cutting all roots cleanly to the depth of the excavation. Roots shall be cut by manually digging a trench and culling exposed roots with a sharp saw or other approved root pruning equipment. The Consulting Arborist will identify where root pruning is required.