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Arborist Report - 10200 N Tantau.pdf � 11 � ' ll Prepared by: Glenn 0. Whitlock-Reeve ISA Certified Municipal Arborist WE-10177ATMISA Qualified Tree Risk Assessor �'K� � Tree Care Professionals Serving Communities Who Care about Trees www.WCAINC.com �. 10200 NORTH TANTAU AVE� Tree removals for sewer renovations Tree Care Professionals Serving Communities Who Care About Trees www.WCAINC.com ARBORIST REPORT 10200 NORTH TANTAU AVE April 12, 2017 ATTN: Mark Thomas Phone: (408) 477-7301 E-Mail: ito@markthomas.com 20863 Stevens Creek Blvd #100 Cupertino, Ca 95014 Re: Tree removals for sewer line renovations at 10200 North Tantau Ave, North West corner of parking lot nearinterstate 280. SCOPE OF WORK:The purpose of this report is evaluate the condition of(4) Coastal Redwoods (Sequoia semperverens) prior to removal due to excavation at the site. Note was taken of the trees immediaYely adjacent to work site for tree preservation efforts. Tools used: Tape measure and Laser Range finder OBSERVATIONS: On April 11, 2017 I visited the site and included my findings as follows Subject trees are numbered from south to north. - --.�.�„'.�' �� -- ��;� _\ --4 � , y� ----ti, - '��f�. :� � � a \ t � ' � � �� • �"`��r �". .. F�_ . � `i. _ .. . �� , ., ♦.'- �•� � , �s � I �. i .. -U 'i`;. �� -� � .. ��e _V� �� . / �� West Coast Arborists, Inc. 390 Martin Avenue Santa Clara,CA 95050(408)855-8660 Page 1 of 6 Tree Care Professionals Serving Communities Who Care About Trees www.WCAW Ccom Tree 1 Coastal Redwood (Sequoia semperverens) REMOVAL DUE TO EXCAVATION Diameter at Standard Hei�ht: 22" Dripline Radius: 12' Hei�ht: 72' Structural Condition: Fair, The tree depicted normal structure for its size and age displaying no obvious defects at the time of inspection Vi�or Condition: Fair, scattered dead branches up to 2" diameter about the canopy normal for the species, new bud growth measured 1-2" Tree 2 Coastal Redwood (Sequoia semperverens) REMOVAL DUE TO EXCAVATION Diameter at Standard Heieht: 22" Dripline Radius: 13' Hei�ht: 72' Structural Condition: Fair Vi�or Condition: Fair Tree 3 Coastal Redwood (Sequoia semperverens) REMOVAL DUE TO EXCAVATION Diameter at Standard Heiaht: 16" Dripline Radius: 9' Hei�ht: 64' Structural Condition: Fair Vi�or Condition: Fair Tree 4 Coastal Redwood (Sequoia semperverens) REMOVAL DUE TO EXCAVATION Diameter at Standard Heiaht: 21" Dripline Radius: 11' Hei�ht: 67' Structural Condition: Fair Vi�or Condition: Fair, Light damage from squirrel activity. Additional Trees Directiv adiacent to planned excavation 20" (DSH) Coastal Redwood (Sequoia semperverens) 15' south of Tree 1 Fair condition. 18" (DSH) Coastal Redwood (Sequoia semperverens) 15' east of Tree 4 Fair condition. 8" (DSH) London Plane Tree (Platanus X hispanica) 25' south east of tree 3 fair condition. West Coast Arborists, Inc. 390 Martin Avenue Santa Clara,CA 95050(408)855-8660 Page 2 of 6 Tree Care Professionals Serving Communities Who Care About Trees www.WCAI NC.mm DISCUSSSION At time of inspection no survey markers where present to determine exact excavation area, trees slated for removal where requested by contractor.Trees 1-4 should be removed by Certified Arborist by climbing or man lift and heavy sections of trunks should be directed away from the root zones of adjacent healthy trees. Excavation near adjacent trees should be done with caution as not to damage the root zones of these trees, basic guide lines have been attached to this report. Installing protective boarding around trunks of trees that may be within reach of heavy machinery is strongly advised to prevent mechanical damage. The placement of heavy machinery on adjacent tree root zones as well as any cut materials (soil) is not advised as it could cause compaction and root decline. Operators should avoid long periods of exhaust directly at or beneath the canopy of adjacent trees, as this can burn and have a toxic effect to tree health. Tree Replacement should be planned with the property owner and underground utility agency to avoid future repeated tree removal. Due to limited planting space at the work site each tree should be replaced with (1) 36" Box Coastal Redwood (Sequoia semperverens) per tree removal, as opposed to 2-1, 24" box specimens. Planting should be done or supervised by certified arborist to insure all Best Management Practices are met, and irrigation or regular watering should be established. ATTACHED TO THIS REPORT ARE PICTURES AND BASIC GUIDELINES FOR EXCAVATION NEAR TREES. Thank you for the opportunity to assist you in your tree assessment needs. If there are any questions or concerns feel free to contact me directly at (408)835-0438,greeve@wcainc.com Respectfu I ly, Glenn O. Whitlock-Reeve ISA Certified Arborist, Municipal Specialist WE-10177ATM ISA Qualified Tree Risk Assessor West Coast Arborists, Inc. West Coast Arborists, Inc. 390 Martin Avenue Santa Clara,CA 95050(408)855-8660 Page 3 of 6 Tree Care Professionals Serving Communi[ies Who Care About Trees www.WCAINC.com . � :t.- ,� ; � '� L �f. - � .. � .,� f � ,•� + ' , . � ; t: -: ,. �,,a.� �'� t. , �'.�...� � .' i' � ,�., �` �/, �F;'�'!4� � -"„�� `� x 4�y �� ati -� �� tl s Y r 1.-. j� �, •-� ��;�� :y f ' y � a ,� r s 4 - ,�, _. -ja�,.�� t— +{�..�,..:. �� - �� ', � �. � :4 � �� ,, { �� r � ' '�' , � ;� �,,��,; ,k . � ,�, �, ,� . . � � � � '. � .{ � � , �':. � -�.� r�;i � ��. ,,� ,: , , . . � � i ,��.� . � � �. . ,. . ui..ir-�.Il��nd�,r, VG.i,�.1ic� Figure2:5ubjec[TreesshownfromWestside � �`' ' . �T ��'� t�y 1 �6 � � ,_ t '"� ' li /�'„�+ � �' ! �� . '� Tw� ._. �' < r ,.+., y�� t 2 j.. �s T � �q� � 4' �`f�I`{'. � n �y W .: r� ��-t . .,� ��i",�.� � i• -,; :.` "�s-�• . � �;� } >T�"tti6.R` ..... , +�.X�'Qt .. �,.7�� (, ' �� .�.i'" ,-y �� . �� ' . . '�J ,�'V ..�� / � .�.. •�. � ��y 1��I' '/�i� ; i r'�- r_�. e_�a , �� .( ,� ._�_'_ �! � 4 '°.-�: , - . �W" j � , F ' �; r ' „ ��. �� '�� _� � _ �M ^v�i_: . -;�:-• _ � . �. _ . 4 '"'�: � 1YYY.��. � . . . . . �� ' ` Figure 1 subjec[[rees bigure 3:Heal[hy ne�v growth shown on Subject Trees West Coast Arborists, Inc. 390 Martin Avenue Santa Clara, CA 95050(408)855-8660 Page 4 of 6 II Tree Care Professionals Serving Communities Who Care Abou[Trees www.W CA W C.com Guidelines for Excavation near Trees Tree roots expand far beyond the canopy of the tree, most roots grow within the top 6- 8" of the soil. It is a common misconception that roots grow straight down or form a mirror image of the canopy. Roots grow where conditions are most favorable, seeking oxygen water and nutrients, knowing this we can make educated guesses as to where important roots may be hidden.This guideline will assist in minimizing damage during excavation and will take a more practical look at the subject, but it is important that an experienced certified arborist is consulted prior to excavation and before cutting large roots that could potentially make the tree unstable and fall, causing damage to property or worse yet injury or death. BEFORE YOU DIG -Measure the diameter of the tree at shoulder level '�' � (Using a diameter tape or straight across the widest part with a tape measure) ��•� ._ !• -Multiply that measurement by 5 and for your TPZ* (EXAMPLE 12"diameter tree,would have a 5'TPZ') Using this method will provide better protection for trees '?� that are not leaning or already structurally unstable. ' ;' � � -Sterilize all tools before working near high value trees, � '' .�2 ' 1 �,,,� y� �,r4';'� digging and cutting tools can carry harmful bacteria and �. • �-" ; ' � ' i . : �. pathogens that could infett the tree. Use an aerosol anti- � � bacterialspray ordiluted bleach. -When trimming roots outside the TPZ* it is best to cut the root with clean sharp saw with small teeth (Saws-all or '^ pruning saw) Any roots lager than 2" in diameter should be inspected by a certified arborist,to determine if the � structure or health of the tree will be jeopardized. *TPZ or Tree protection zone. Digging inside the tree protection zone should be done by hand to minimize damage to the essential roots. Pulling roots with machinery can cause fractures in the main trunk of the tree making the tree unstable and potentially a liability. When in doubt contact a Certified Arborist to assess the area. West Coast Arborists, Inc. 390 Martin Avenue Santa Clara,CA 95050(408)855-8660 Page 5 of 6 Tree Care Professionals Serving Communities Who Care About Trees www.WCA W C.com ASSUMPTIONS AND LIMITING CONDITIONS 1. Care has been taken to obtain all informa[ion from reliable sourtes.All data has been verified insofar as possible; however,the Consultant can neither guarantee nor be responsible for the accuracy of information provided by others.Standard of Care has been met with regards to this project within reasonable and normal conditions. 2. The Consultant will not be required to give testimony or to attend court by reason of this report unless subsequent contractual agreements are made,including payment of an additional fee for such services as described in the fee schedule and contract of engagement. 3. Loss or alteration of any part of this report invalidates the entire report. 4. Possession of this report or a copy thereof does not imply right of publication or use for any purpose by any other than the person to whom it is addressed,without the prior written consent of the Consultant. 5. This report and any values expressed herein represent the opinion of the Consultant,and the Consultant's fee is in no way contingent upon the reporting of a stipulated result,a specified value,the occurrence of a subsequent event, nor upon any finding to be reported. 6. Unless expressed otherwise: 1)information tontained in this report covers only those items that were examined and reflects the condition of those items at the time of inspection;and 2)the inspection is limited to visual examination of accessible items without dissection,excavation, or coring, unless otherwise stated.There is no warranty or guarantee,expressed or implied,that problems or deficiencies of the tree(s)or property in question may not arise in the fu[ure. 7. Arborists are tree specialists who use their education, knowledge,treining,and experiente to examine trees,recommend measures to enhance the beauty and health of trees,and attempt to reduce the risk of living near trees. It is highly recommended that you follow the arborist recommendations; however,you may choose to accept or disregard the recommendations and/or seek additional advice. 8. Arborists cannot detect every condition that could possible lead[o the structural failure of a tree.Trees are living organisms that fail in ways we do not fully understand.Conditions are oken hidden within trees and below ground.Arborists cannot guarantee that a tree will be healthy or safe under all circumstances, or for a specific period of time. 9. Any recommendation and/or performed treatments(including, but not limited to, pruning or removal)of trees may involve considerations beyond the scope of the arborisYs services,such as proper[y boundaries, property ownership,site lines, disputes between neighbors, and any other related issues. Arborists cannot take such considerations into account unless complete and accurate information is disclosed to the arborist.An arborist can then be expected to consider and reasonably rely on the completeness and accuracy of the information provided. 10. The author has no personal interest or bias with respect to the subject matter of this report or the parties involved. He/she has inspected the subject tree(s) and to the best of their knowledge and belief, all statements and information presented in the report are true and correct. 11. Unless otherwise stated,trees were examined using the risk assessment criteria detailed by the International Society of Arboriculture's publications Best Monagement Practices—Tree RiskAssessment and the Tree RiskAssessment Monuol. West Coast Arborists, Inc. 390 Martin Avenue Santa Clara, CA 95050(408)855-8660 Page 6 of 6