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Arborist Report 08-19-19 Revised.pdf - Adobe Acrobat ARBORIST REPORT Submitted To: Hunter Properties, Inc. Ms. Rachel Royer 10121 Miller Avenue #200 Cupertino, CA 95014 Project Location: 10655 Mary Avenue Cupertino, CA 95014 Submitted By: McCLENAHAN CONSULTING, LLC John H. McClenahan ISA Board Certified Master Arborist, WE-1476B member, American Society of Consulting Arborists August 27, 2018 August 19, 2019 Revised ©Copyright McCLENAHAN CONSULTING, LLC 2019 AM WorK NlcClenahan Consulting, LLC Arboriculturists Since 1911 1 Arastradero]toad,Portola Valley CA 94028-8012 Telephone(650)326-8781 Fax(650)854-1267 www.spmcclenahan.com August 27, 2018 Revised August 19, 2019 Hunter Properties, Inc. Ms. Rachel Royer 10121 Miller Avenue #200 Cupertino, CA 95014 RE 10655 Mary Avenue Cupertino, CA 95014 Assignment As requested, I performed a visual inspection of 32 protected trees to determine species, size and condition and provide tree protection and tree preservation guidelines. Summary Trees one through thirteen are located on the City of Cupertino neighboring property. Proposed site improvements will include two bioretention areas that will require removal of eight trees (17- 23 and 29). Trees scheduled for removal are not protected by city ordinance due to species. Tree Protection Zones have been defined for each tree as six times the trunk diameter from the root flare. Tree protection fencing should be installed as close to the TPZ or dripline as feasible, (whichever distance is greater). Figure 2 indicates the trees protected by City of Cupertino ordinance. Although it is recommended that grading and excavation do not occur within the TPZ, the following recommendations will help protect trees to remain should grading or excavation occur within a TPZ. • Any grading or excavation within TPZ must be accomplished by hand or air digging • A qualified arborist must supervise any cutting of roots within TPZ • A qualified arborist must provide mitigation for any root cutting in the TPZ • Adoption of Tree Preservation Guidelines will enhance prognosis Tree removals non protected trees with protected tree mitigation requirements 17 Red ironbark 19.2` One 36-inch box tree 18 Red ironbark 15.8. 12.6. 14.6. 14.2. 13.7. 12.2` One 36-inch box tree 19 Eucalyptus 20.6` One 36-inch box tree 20 Eucalyptus 16.6" One 36-inch box tree 21 Eucalyptus 23.3° One 36-inch box tree 22 Eucalyptus 17.5. 10.3, 9" One 36-inch box tree 23 Chinese pistache 18.1' One 36-inch box tree 29 Tree of heaven 8.9" One 24-inch box tree Figure 1:Proposed removals with mitigation Hunter Properties, Inc. Ms. Rachel Royer Methodology No root crown exploration, climbing or plant tissue analysis was performed as part of this survey. For purposes of identification, trees have been numbered on the preliminary site plan shown in Figure 2. In determining Tree Condition several factors have been considered which include: Rate of growth over several seasons; Structural decays or weaknesses; Presence of disease or insects; and Life expectancy. Tree Description/Observation 1 Coast redwood (Sequoia sempervirens) Diameter: 28.8" Height: 50' Spread: 20' Condition: Fair Location: Neighboring property Observation: Crown exhibits signs of water stress. Existing asphalt creates a poor root environment. The TPZ is 15-feet. 2 Coast redwood Diameter: 25.2" Height: 45' Spread: 21' Condition: Fair Location: Neighboring property Observation: Crown exhibits signs of water stress. Existing asphalt creates a poor root environment. The TPZ is 13-feet. 3 Coast redwood Diameter: 19.8" Height: 30' Spread: 18' Condition: Fair Location: Neighboring property Observation: Crown exhibits signs of water stress. Existing asphalt creates a poor root environment. The TPZ is 10-feet. 4 Coast redwood Diameter: 20.9" Height: 25' Spread: 26' Condition: Fair to Good Location: Neighboring property Observation: Crown exhibits signs of water stress. Existing asphalt creates a poor root environment. The TPZ is 11-feet. 2 Hunter Properties, Inc. Ms. Rachel Royer 5 Coast redwood Diameter: 13.5" Height: 35' Spread: 15' Condition: Poor to Fair Location: Neighboring property Observation: Crown exhibits signs of water stress. Existing asphalt creates a poor root environment. The TPZ is 7-feet. 6 Coast redwood Diameter: 16.0" Height: 25' Spread: 20' Condition: Fair Location: Neighboring property Observation: Crown exhibits signs of water stress. Existing asphalt creates a poor root environment. The TPZ is 8-feet. 7 Red horsechestnut (Aesculus x carnea) Diameter: 9.1" Low Branching Height: 12' Spread: 12' Condition: Fair Location: Neighboring property Observation: Low branching growth habit creates an inherent structural defect. The TPZ is 6-feet. 8 Red horsechestnut Diameter: 17.1" Low Branching Height: 18' Spread: 24' Condition: Fair Location: Neighboring property Observation: Low branching growth habit creates an inherent structural defect. Surface rooting observed. The TPZ is 9-feet. 9 Red horsechestnut Diameter: 15.0" Low Branching Height: 15' Spread: 16' Condition: Poor Location: Neighboring property Observation: Low branching growth habit creates an inherent structural defect. Dieback of crown observed. Surface rooting observed. The TPZ is 8-feet. 10 Photinia (Photinia x fraserii) Diameter: 4, 3.5, 2.6, 3.8" Multi trunk Height: 13' Spread: 15' Condition: Poor Location: Neighboring property Observation: Dieback of crown observed. The TPZ is 6-feet. 3 Hunter Properties, Inc. Ms. Rachel Royer 11 Coast redwood Diameter: 21.9" Height: 40' Spread: 18' Condition: Fair Location: Neighboring property Observation: Row of three trees at frontage with overlapping crowns and a limited root environment. The TPZ is 12-feet. 12 Coast redwood Diameter: 25.0" Height: 45' Spread: 20' Condition: Fair Location: Neighboring property Observation: Row of three trees at frontage with overlapping crowns and a limited root environment. The TPZ is 13-feet. 13 Coast redwood Diameter: 31.7" Height: 50' Spread: 22' Condition: Fair Location: Neighboring property Observation: Row of three trees at frontage with overlapping crowns and a limited root environment. The TPZ is 16-feet. 14 Atlas cedar (Cedrus atlantica) Diameter: 21.2" Height: 40' Spread: 30' Condition: Poor to Fair Location: Frontage Observation: Crown appears water stressed with a moderate accumulation of deadwood. The TPZ is 11-feet. 15 Deodar cedar (Cedrus deodara) Diameter: 19.0" Height: 45' Spread: 28' Condition: Fair Location: Frontage Observation: Pair of trees creating one larger canopy. Grows on an existing mound. The TPZ is 10-feet. 16 Deodarcedar Diameter: 19.4" Height: 45' Spread: 28' Condition: Fair Location: Frontage Observation: Pair of trees creating one larger canopy. Grows on an existing mound. The TPZ is 10-feet. 4 Hunter Properties, Inc. Ms. Rachel Royer 17 Red ironbark (Eucalyptus sideroxylon) Diameter: 19.2" Height: 30' Spread: 24' Condition: Fair Location: Frontage Observation: Grows to a lean. Proposed for removal. 18 Red ironbark Diameter: 15.8, 12.6, 14.5, 14.2, 13.7, 12.2" Multi trunk Height: 40' Spread: 40' Condition: Poor to Fair Location: Frontage Observation: Weak branch attachments prone to failure. Proposed for removal. 19 Eucalyptus Diameter: 20.6" Height: 35' Spread: 32' Condition: Poor to Fair Location: Frontage Observation: Crown is slightly sparse with minor dieback. Proposed for removal. 20 Eucalyptus Diameter: 16.5" Height: 32' Spread: 30' Condition: Poor to Fair Location: Frontage Observation: Crown is slightly sparse with minor dieback. Proposed for removal. 21 Eucalyptus Diameter: 23.3" Height: 36' Spread: 32' Condition: Poor to Fair Location: Frontage Observation: Crown is slightly sparse with minor dieback. Proposed for removal. 22 Eucalyptus Diameter: 17.5, 10.3, 9" Height: 36' Spread: 40' Condition: Poor Location: Outside fence frontage Observation: Poor vigor. Basal suckers ( two 10" diameter) have weak attachments. Proposed for removal. 23 Chinese pistache (Pistacia chinensis) Diameter: 18.1" Height: 25' Spread: 25' 5 Hunter Properties, Inc. Ms. Rachel Royer Condition: Fair Location: Frontage Observation: Average vigor. Crown has need raised to 15-feet. Narrow scaffold limb attachments. The TPZ is 10-feet. 24 Almond (Prunus amygdalus) Diameter: 9.1, 8.7, 10.3" Multi trunk Height: 12' Spread: 18' Condition: Poor Location: Frontage Observation: Exhibits poor vigor and dieback. The TPZ is 10-feet. 25 Red ironbark Diameter: 17.1" Height: 13' Spread: 18' Condition: Very Poor Location: Frontage Observation: Below average vigor. Broken limb visible on ground. The TPZ is 10-feet. 26 Olive (Olea europaea) Diameter: 8" Multi trunk Height: 10' Spread: 14' Condition: Poor to Fair Location: Frontage Observation: Bushy growth habit. Low vigor. The TPZ is 6-feet. 27 Almond Diameter: 13.6, 8.5, 5.5" Multi trunk Height: 15' Spread: 22' Condition: Poor to Fair Location: Frontage Observation: Crown exhibits a moderate accumulation of deadwood. The TPZ is 12-feet. 28 Tree of heaven Diameter: 6.7, 4.6, 5.3, 9.1" Multi trunk Height: 18' Spread: 15' Condition: Fair to Good Location: Frontage Observation: Invasive species. The TPZ is 10-feet. 29 Tree of heaven Diameter: 8.9" Height: 16' Spread: 5' Condition: Fair Location: Frontage 6 Hunter Properties, Inc. Ms. Rachel Royer Observation: Invasive species. Sucker from adjacent tree. The TPZ is 6-feet. 30 Chinese pistache Diameter: 6.3" Height: 10' Spread: 8' Condition: Fair Location: Frontage Observation: Leans. The TPZ is 6-feet. 31 Chinese pistache Diameter: 12.2" Low Branching Height: 9' Spread: 12' Condition: Fair Location: Frontage Observation: Top of hillside. The TPZ is 6-feet. 32 Chinese pistache Diameter: 6.1" Height: 12' Spread: 12' Condition: Fair Location: Street tree Observation: Young establishing tree. The TPZ is 6-feet. 14.18.050 Protected Trees. Except as otherwise provided in Section 14.18.170,,the following trees shall not be removed without first obtaining a tree removal permit: A. Heritage trees in all zoning districts. B. All mature specimen trees of the following species on private property(see Appendix A): 1. Quercus(native oak tree species);including: a. Quercus agrifolia(Coast Live Oak); b. Quercus lobata(Valley Oak); c. Quercus kelloggii(Black Oak); d. Quercus douglasii(Blue Oak); e. Quercus wislizeni(Inferior Live Oak); 2. Aesculus californica(California Buckeye); 3. Acer macrophyllum(Big Leaf Maple); 4. Cedrus deodara(Deodar Cedar); 5. Cedrus atlantica'Glauca'(Blue Atlas Cedar); 6. Umbellularia californica(Bay Laurel or California Bay);and 7. Platanus racemosa(Western Sycamore). C. Approved development trees(s). D. Approved privacy protection planting in R-1 zoning districts. (Ord.14-2121,§3(part),2014;Ord.13-2107,§2(part),2013;Ord.2085,§2(part),2011:Ord.2003,2007) Figure 2:Cupertino Protected Trees 7 Hunter Properties, Inc. Ms. Rachel Royer r� ,. `j ZIf I MWO LT f y fr , • Y i �� ..+ACE RYS01�i�ti1Gr i Y1UEL11G'I4 1 bd1M umna rim ...l � LOC-N-STGRSELF STORAGE FIRE ACCESS CUPERTINO, CA Figure 3:Site map E 8 '-" r a ; . . 14 , F� � �-g-i'.'.a RS �j{ „5 � �sk@ � ✓ '�' �.. All Hunter Properties, Inc. Ms. Rachel Royer a k 01. P k fi Y m a." yr s M r r' 4' "It,7 - TREE PRESERVATION GUIDELINES Tree Preservation and Protection Plan In providing recommendations for tree preservation, we recognize that injury to trees as a result of construction include mechanical injuries to trunks, roots and branches, and injury as a result of changes that occur in the growing environment. To minimize these injuries, we recommend grading operations encroach no closer than six times the trunk diameter, (i.e. 30" diameter tree x 6=180" distance). At this distance, buttress/anchoring roots would be preserved and minimal injury to the functional root area would be anticipated. Should encroachment within the area become necessary, hand digging is mandatory. Barricades Prior to initiation of construction activity, temporary barricades should be installed around all trees in the construction area. Six-foot high, chain link fences are to be mounted on steel posts, 10 Hunter Properties, Inc. Ms. Rachel Royer driven 2 feet into the ground, at no more than 10-foot spacing. The fences shall enclose the entire area under the drip line of the trees or as close to the drip line area as practical. These barricades will be placed around individual trees and/or groups of trees as the existing environment dictates. The temporary barricades will serve to protect trunks, roots and branches from mechanical injuries, will inhibit stockpiling of construction materials or debris within the sensitive 'drip line' areas and will prevent soil compaction from increased vehicular/pedestrian traffic. No storage of material, topsoil, vehicles or equipment shall be permitted within the tree enclosure area. The ground around the tree canopy shall not be altered. Designated areas beyond the drip lines of any trees should be provided for construction materials and onsite parking. Root Pruning (if necessary) During and upon completion of any trenching/grading operation within a Tree Protection Zone, clean pruning cuts of exposed, damaged or severed roots greater than one inch diameter should be accomplished under the supervision of a qualified Arborist to minimize root deterioration beyond the soil line within twenty-four(24) hours. Pruning Pruning of the foliar canopies to include removal of deadwood is recommended and should be initiated prior to construction operations. Such pruning will provide any necessary construction clearance, will lessen the likelihood or potential for limb breakage, reduce 'windsail' effect and provide an environment suitable for healthy and vigorous growth. Irrigation A supplemental irrigation program is recommended for the ? trees and should be accomplished at regular three to four-week intervals during the period of May 1st through October 31st. Irrigation is to be applied at or about the 'drip line' in an amount sufficient to supply approximately ten (10) gallons of water for each inch in trunk diameter. Irrigation can be provided by means of a soil needle, 'soaker' or permeable hose. When using `soaker' or permeable hoses, water is to be run at low pressure, avoiding runoff/puddling, allowing the needed moisture to penetrate the soil to feeder root depths. Fertilization A program of fertilization by means of deep root soil injection is recommended with applications in spring and summer for those trees to be impacted by construction. Fertilizer should include organic blends and components such as mycorrhizae and bio stimulants. Such fertilization will serve to stimulate feeder root development, offset shock/stress as related to construction and/or environmental factors, encourage vigor, alleviate soil compaction and compensate for any encroachment of natural feeding root areas. Inception of this fertilizing program is recommended prior to the initiation of construction activity. Mulch Mulching with wood chips (maximum depth 3") within tree environments (outer foliar perimeter) will lessen moisture evaporation from soil, protect and encourage adventitious roots and minimize possible soil compaction. Inspection 11 Hunter Properties, Inc. Ms. Rachel Royer Periodic inspections by the Site Arborist are recommended during construction activities, particularly as trees are impacted by trenching/grading operations. Inspections at approximate four (4) week intervals would be sufficient to assess and monitor the effectiveness of the Tree Preservation Plan and to provide recommendations for any additional care or treatment. All written material appearing herein constitutes original and unpublished work of the Arborist and may not be duplicated, used or disclosed without written consent of the Arborist. We thank you for this opportunity to be of assistance in your tree preservation concerns. Should you have any questions, or if we may be of further assistance in these concerns, kindly contact our office at any time. McCLENAHAN CONSULTING, LLC By: John H. McClenahan ISA Board Certified Master Arborist, WE-1476B member, American Society of Consulting Arborists JHMc: cm 12 Hunter Properties, Inc. Ms. Rachel Royer NlcClenahan Consulting, LLC Arboriculturists Since 1911 1 Arastradero Road,Portola Valley CA 94028-8012 Telephone(650)326-8781 Fax(650)854-1267 www.spmcclenahan.com ARBORIST DISCLOSURE STATEMENT Arborists are tree specialists who use their education, knowledge, training and experience to examine trees, recommend measures to enhance the beauty and health of trees, and attempt to reduce the risk of living near trees. Clients may choose to accept or disregard the recommendations of the arborist, or seek additional advice. Arborists cannot detect every condition that could possibly lead to the structural failure of a tree. Trees are living organisms that fail in ways we do not fully understand. Conditions are often hidden within trees and below ground. Arborists cannot guarantee that a tree will be healthy or safe under all circumstances, or for a specified period of time. Likewise, remedial treatments, like a medicine, cannot be guaranteed. Treatment, pruning, and removal of trees may involve considerations beyond the scope of the arborist's services such as property boundaries, property ownership, site lines, disputes between neighbors, landlord-tenant matters, etc. Arborists cannot take such issues into account unless complete and accurate information is given to the arborist. The person hiring the arborist accepts full responsibility for authorizing the recommended treatment or remedial measures. Trees can be managed, but they cannot be controlled. To live near a tree is to accept some degree of risk. The only way to eliminate all risks is to eliminate all trees. Arborist: John H. McClenahan Date: August 19, 2019 Revised 13