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<br />Preliminary Tree Report, 3459 Foothill Rd., Pleasanton <br />April 2, 2004 <br /> <br />HortScience, Inc. <br />Page 10 <br /> <br />of those removed trees shall be ground out 12" below grade and not pulled out as this <br />could injure remaining trees. <br /> <br />Recommendations for tree protection during construction <br />1. No grading, construction, demolition or other work shall occur within the TREE <br />PROTECTION ZONE. Any modifications must be approved and monitored by the <br />Consulting Arborist. <br /> <br />2. Supplemental irrigation shall be applied to retained trees every two weeks between <br />May and October. <br /> <br />3. If injury should occur to any tree during construction, it should be evaluated as soon <br />as possible by the Consulting Arborist so that appropriate treatments can be applied. <br /> <br />4. No excess soil, chemicals, debris, equipment or other materials shall be dumped or <br />stored within the TREE PROTECTION ZONE. <br /> <br />5. Any additional tree pruning needed for clearance during construction must be <br />performed by a Certified Arborist and not by construction personnel. <br /> <br />6. 'As trees withdraw water from the soil, expansive soils may shrink within the root area. <br />Therefore, foundations, footings and pavements on expansive soils near trees should <br />be designed to withstand differential displacement. <br /> <br />Maintenance of impacted trees <br />Preserved trees will experience a physical environment different from that pre-development. <br />As a result, tree health and structural stability should be monitored. Occasional pruning, <br />fertilization, mulch, pest management, replanting and irrigation may be required. In addition, <br />provisions for monitoring both tree health and structural stability following construction must <br />be made a priority. As trees age, the likelihood of failure of branches or entire trees <br />increases. Therefore, annual inspection for hazard potential is recommended. <br /> <br />HortScience, Inc, <br /> <br /> <br />John Leffingwell <br />Certified Arborist #WE-3966 <br />