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David L. Bobby, Registered Consulting Arhorist'b July 8. 2013 24. Removal of any vegetation or plants within a TPZ should be manually performed versus being excavated. Additionally, any stumps removed within a TPZ should be around versus excavated. 25. Great care must be taken by equipment operators to position their equipment to avoid the trees' trunks and branches, including placing any exhaust pipes beneath or near canopies, and consequently, scorching foliage. 26. Tree pruning should occur prior to demolition and construction, particularly to clear encroaching branches away from the existing building. It shall be performed in accordance with ANSI A300-2001 standards, and by a California state-licensed tree service company (D-49 classification) that has an ISA certified arborist in a supervisory role, carries General Liability and Worker's Compensation insurance, and abides by ANSI Z133.1-2006(Safety Operations). 27. The disposal of harmful products (such as cement, paint, chemicals, oil and gasoline) is prohibited beneath canopies or anywhere on site that allows drainage beneath or near TPZs. Herbicides should not be used with a TPZ; where used on site, they should be labeled for safe use near trees. 28. Fertilization, if properly applied, may benefit the tree's health, vigor and appearance. Prior to doing so, however, soil samples should first be obtained to identify the pH levels and nutrient levels so a proper fertilization program can be established. I further recommend any fertilization is performed in accordance with ANSI A300 (Part 2) — 2004 Fertilization standards. 3192 Santa Rita Road, Pleasanton Page 9 of 10 Mr.Joe Nguyen.A.S7 Consulting