The URL can be used to link to this page

TR-2010-28b OFFICE OF COMMU VITY DEVELOPMENT CITY HALL 10300 TORRE AVEN JE • CUPERTINO, CA 95014-3255 C U P E RT 1 N O (408) 777-3308 • FAX (408) 777-3333 • planninqCa�cupertino.orq August 27, 2010 Peter Caravalho 10196 Dubon Ave. Cupertino, Ca. 95014 SUBJECT: TREE REMOVAL PERMIT ACTIO �T LETTER - Application TR-2010-28: This letter confirms the decision of the Directc�r of Community Development, given on August 27, 2010, approving a tree removal permit to r�move and replace one (1) Blue Atlas Cedar tree, located at 10196 Dubon Avenue, with the foll��wing conditions: 1. APPROVED PROTECT The approval is based on the Arborist report prepared by David Babby of Arbor Resources, Registered Consulting A��borist #399, dated July 13, 2010 (this report is available upon request) pertaining tc� the Blue Atlas Cedar tree, except as may be amended by conditions in this resoluti �n. 2. TREE REPLACEMENTS The applicant shall be required to plar�t one (1) 36-inch box size in accordance with the City's Protected Trees Ordinance. TYie required replacement trees shall be planted within 15 days of the effective approv� l date of this tree removal permit. 3. NOTICE OF FEES, DEDICATIONS, RI�SERVATIONS OR OTHER EXACTIONS The Conditions of Project Approv� 1 set forth herein may include certain fees, dedication requirements, reservation °equirements, and other exactions. Pursuant to Government Code Section 66020(d) (1►, these Conditions constitute written notice of a statement of the amount of such fees, and a description of the dedications, reservations, and other exactions. You are hereby further notified that the 90-day approval period in which you may ��rotest these fees, dedications, reservations, and other exactions, pursuant to Governxn�nt Code Section 66020(a), has begun. If you fail to file a protest within this 90-day pE�riod complying with all of the requirements of Section 66020, you will be legally barrE�d from later challenging such exactions. Staff has made the findings necessary to gr �int the tree removal permit in accordance with Section 14.18.180 of the Protected Trees Ordin ance. Sincerely, _ / ��o�,,,..� � Brian Paland Assistant Planner City of Cupertino ARBOR RES()LIRCES professional co arborists and tree care July 13, 2010 Brian Paland Community Development Department City of Cupertino 10300 Torre Avenue Cupertino, CA 95014-3255 R��F��!/AL l!e o2ot0�,2�� S; , . _.�� 'i_. ..,., RE: ONE BLUE ATLAS CEDAR °�-°F-°T- �� 10196 Dubon Avenue, Cupertino �,., �, 4 ^2 -�� O.d�t�: s:�.,.iA;��i `/ �`� ... ...... Dear Mr. Paland: This report has been prepared in response to your email dated July 7, 2010, which references the large tree located near the i ront of the home at the above-referenced site. Specific tasks performed for my review are as follows: 1. Evaluate the tree's health and structur �1 condition. 2. Review the plot plan emailed to me oi� July 7, 2010. 3. Assess the potential risk the tree presents to the existing foundation. 4. Ascertain any potential impacts that �onstructing the addition would impose on the tree's stability and longevity. I viewed the tree on July 8, 2010, and this report presents my observations, photographs, and review. OBSERVATIONS The subject tree is a blue atlas cedar (Cedrz�s a. `Glauca') that has a trunk diameter of 34.7 inches (measured 24 inches above grade), a height of approximately 55 feet, and a relatively balanced canopy with a sprea i of nearly 60 feet across; photographs are presented on the next page. The closest e ige of the trunk's base (where the trunk meets soil grade) is situated 6.9 feet (measured) from the existing foundation. Ground beneath the canopy is largely unpaved. p.o. box 25295, san mateo, california 94402 ■ email: arborresourcesQcomcast.net phone: 650.654.335 I ■ fax: 650.24C.0777 ■ licensed contractor #796763 ARBOR RESC)LIRCES professional consultinc arborists and t r e e care � ��- `.;`�"L 7le'�°�° July 13, 2010 10196 Dubon Avenue - $ �°?� �� page 2 of 4 ` -��._ -��;� � �� ,� o��' ��r,��.�,�. 3, �, � �'� . r � ,, t , , 3 �, � ` d' ° ;,�-�;` � : ` � ��i ' il" ��II`�It� ,� , � . :, � � - ;. -.�� , �, � , � � �� ,� �� '�'�`;�� ;, � �•�, � b < .> �� °� � : ti ,- �' � ��= ; ,��.r ��.�,. ��° The tree appears healthy and vigorous �� ! � � � as foliage color, shoot growth and , .� canopy density seem normal. � The tree's structure, however, is less r than ideal due to being comprised of seven main leaders, several of which, =� -. . ,; < . �� .. particularly and most significantly the two easternmost ones, grow with narrow angles of attachment. This type of growth characteristic increases the potential risk tY: at one or more leaders could fail from the tree as its ages (i.e. leaders with wider angles oi' attachment have less of a risk of failing versus those with narrow angles). p.o. box 25295 san mateo, california 94402 ■ email: arborresourccsQcomcast.net phone: 650.654.335 I ■ fax: 650.240.0777 ■ licensed contractor #796763 ARBOR RESC)LIRCES professional co n su ltinc � arborists and tree care �,� .... �� v�.. Ti?-a��o :�� , July 13, 2010 10196 Dubon Avenue �--�°� - g�� 7 �� page 3 of 4 �� + —fJ/� / v,�� t�i��irE: �-_ /�4�•--�/( .. _v.� .,�,., , .�.�, Measures to potentially reduce the risk inc:lude pruning to reduce heavy limb weight, as well as possibly installing support cables (and/or other support systems) and providing frequent monitoring (e.g. every year or twc) of the tree and cables. Note that pruning and any cabling must be performed according to professional industry standards set forth by ANSI, by a California state-licensed tree service company (D-49 classification), and under the direction and supervision of an ISA (I nternational Society of Arboriculture) certified arborist. REVIEW OF POTENTIAL DAMAGE TO FC�UNDATION As with many large-growing trees situatec. near a foundation, there is a potential risk of damage that may increase overtime. Durin; my site visit, I did not observe any damage to the home near the tree's trunk, although the tree is close enough that roots are likely growing along the foundation, but also far enough away that their size and concentration may or may not be substantial enough to a�nclude a significant risk to the foundation now or in the foreseeable future (such as 10 to l 5 years). To allow for the risk to be accurately quantified, roots growing along the found�tion and within 12 to 15 feet from the tree's trunk must be exposed to the foundation depth. In doing so, the trench must be, at a minimum, manually and carefully dug to 12 to 24 inches from the foundation, and in a manner that avoids damaging roots two inclies and greater in diameter. Once the work described above is perfo:�med, I can revisit the site to reevaluate and determine if any measures can be employed to minimize the potential risk to less-than- significant levels, or if any action in doing so would result in jeopardizing the tree and safety to persons and property below. p.o. box 25295, san mateo, california 94402 ■ email: arborresourcesQcomcast.net phone: 650.654.335 I ■ fax: 650.24C .0777 ■ licensed contractor #796763 ARBOR RESC)LIRCES professio consultinc arborists and tree ca July 13� 2�1� !",�.� �",r5^"'+�:t�3 �� / /l ��0�� +CC� 10196 Dubon Avenue �, �J�ri,ber page 4 of 4 .r .�., _.�.._, _ _�,�,u .�� .�� -�� G .,. .:; , . . � : .. _ -�--' ��.�-�,-�� . ..� _ _ �r REVIEW OF POTENTIAL IMPACTS The plan emailed for my review indicates that an addition is proposed approximately four feet beyond the existing residence, in the di -ection of the tree's trunk. As the foundation of the existing residence is 6.9 feet from the trunk's base, implementation of the proposed design would place the new foundation rc ughly within three feet from the base. When considering overcut required to form ar d pour the foundation (and possibly install drainage), root loss would result within one-foot from the trunk's base. At these extremely close distances, the tree would be severel:� impacted and subjected to premature decline and instability. If the tree is to remain and be adequately p rotected, the proposed design requires revisions to achieve a minimum setback from the trunk of 15 feet for any trenching, soil cuts, fill or compaction. At your request, additional protection measures can be provided to help mitigate or avoid impacts to the tree during construction. Sincerely, �'�'�� !�r • ��t' David L. Babby `��.� ` � Registered Consulting Arborist� #399 �`� '� " Board-Certified Master Arborist #WE-4001 B p.o. box 25295, san mateo, california 94402 ■ email: arborresources aQcomcast.net phone: 650.654.335 I ■ fax: 650.24C�.0777 ■ licensed contractor #796763