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URBAN TREE MANAGEMENT P.O. Box 971 Los Gatos, CA 95031-0971 P 650.321-0202 F 408.399-8063 Certified Arborist WC ISA#623 Controctors License #755989 eD('ai A S (,t,/tv& g" vew\- di Pi ATTACHMENT /I 5/21/07 David Dearden, Construction Manager Shimmon Residence 24301 Elise Court Los Altos Hills, CA 94024 CC. Leslie Hopper Re: Driveway & Drain Comments To Whom It May Concern: Assignment It was my assignment to inspect the driveway reconstruction plans & existing drains near Oak Trees (Quercus agrifolia & Q. douglassir) & make comments. Summary The drains can easily be diverted away from the Oak trees. The driveway must be carefully lifted, very little grading will be allowed & then the driveway may be replaced. With careful attention & a site visit from the Project Arborist this will be a successful project. Discussion Currently there are a few drains that exit the new concrete wall between the office & the home. The drains are located above 2 — 3 Coast Live Oaks. At their current location the additional runoff water would dump right onto the tree trunks & could cause future root rot problems. In order to prevent any kind of problem from this excess water I recommend the drains be either diverted away from or extended below the Oaks so that there is no drain water within 8' of the Oak trunks. If these drains are to be piped underground then it must be stated that tree roots larger than 1 '/2" in diameter must not be severed. Currently there is an asphalt driveway winding to the house under some Oak trees. These Oaks are receiving additional care to try to improve their overall Health. The root collars have been carefully excavated to expose the buttress roots. Additionally, the trees have had their trunks & foliage sprayed to prevent insect & fungal infestations. The trees will receive supplemental irrigation once a month this summer & all bare soils will be covered with 6" of wood chips to help improve the root environment. w .urbantreemanagement.com .