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David L. Bobby,Registered Consulting ArborisiR' July 8, 2013 <br /> 6.0 TREE PROTECTION MEASURES <br /> Recommendations presented within this section are intended to serve as measures to help <br /> mitigate or avoid impacts to retained trees. I should be consulted in the event any cannot <br /> be followed or implemented in their entirety. <br /> 1. Recommendations presented in Section 5.0 of this report should be followed and <br /> considered part of this section. <br /> • <br /> 2. A note should be placed on all site-related plans to instruct contractor personnel to <br /> adhere to recommendations presented in this report. <br /> 3. For this project, the Tree Protection Zone (hereinafter "TPZ") should be the ground <br /> area away from existing foundations, and to a distance from their trunks (center at <br /> base) of six to ten times the diameters., where a tree consists of multiple trunks, the <br /> largest trunk would only be considered. The TPZ is where all demolition, grading, <br /> overexcavation, subexcavation, soil scraping, trenching and compaction shall be <br /> avoided except where otherwise approved. In areas where these setbacks are not <br /> feasible, I can be consulted to consider mitigation for an alternative TPZ. <br /> 4. The project design should consider that soil disturbance (e.g. overexcavation, <br /> subexcavation, grading, compaction or trenching) beyond a feature to be built should <br /> be reduced to the maximum extent possible in the direction of a tree's trunk. <br /> 5. Swales, biowales and hiofiltration areas should be established beyond TPZs. <br /> 6. To restrict spoils and runoff from traveling into root zones, the future erosion control <br /> design should establish any silt fence and/or straw rolls as close to the canopy edge as <br /> possible (and not against a trunk). Additionally, any material installed within a TPZ <br /> should require a maximum vertical soil cut of two inches for its embedment. <br /> 7. All utilities and services (e.g. storm drain, electrical, water, sewer, fiber optic, gas, <br /> etc.) should be routed beyond TPZs. In the event this is not feasible, the location and <br /> 3192 Santa Rita Road. Pleasanton Page 5 of-10 <br /> Mr.Joe Nguyen. AS/Consulting <br />