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Approved Arborist Report
Community Development Department FE-21 Planning Division — Cupertino CUPERTINO APPROVED Case # TDP-2019-001, Approval Body: Ad mn H0 earring32 Approval Date 01/10/20 .:RBORIST REPORT Signature Ellen Yau Case Manager November 4, 2019 5202.00 PROJECT 19900 Stevens Creek Cupertino, CA PREPARED FOR 19900 Stevens Creek PREPARED BY HMH 1570 Oakland Road San Jose, CA 95131 William Sowa ISA Certified Arborist #WE-12270A FMICommunity Development Department Planning Division — Cupertino CUPERTINO APPROVED Case # TDP-2019-001, Approval Body: Ad mn HOearring32 Approval Date 01/10/20 Signature Ellen Yau Table -o5 n s Introduction and Overview TABLE OF CONTENTS Methodology Summary of Findings General Observations and Recommendations Recommendations for Tree Protection During Construction Maintenance Recommendations for Trees to Remain Terms and Conditions Exhibit A — Existing Tree Map Table 1 - Tree Quantity Summary Table 2 - Tree Evaluation Summary Tree Photographs Paqe 1 2 2 2 3 5 6 8 9 10 11 16 1 Community Development Department FE-21Planning Division — Cupertino COPE RTINO Case# I NIft4p _ N AND OVERVIEW HFRFWA91J9y t 2cted to complete a survey, assessment and arborist report for trees located within d Approval Bod in a in he limit ��j�b%bc illustrated on Exhibit A. The project consists of hardscape and landscape Approval Date g -existing retail center. The project has had some parking lot and tree Signature " is phase of the project is to create some outdoor amenity spaces for future tenants. Our scope of services includes locating, measuring DBH, assessing, and photographing the condition of all trees within the limit of work. Disposition and health recommendations are based on current site conditions. Site development/design may affect the preservation suitability. METHODOLOGY Our tree survey work is a deliberate and systematic methodology for cataloging trees on site: 1. Identify each tree species. 2. Note each tree's location on a site map. 3. Measure each trunk circumference at 4.5' above grade per ISA standards. 4. Evaluate the health and structure of each tree using the following numerical standard: 5 - A healthy, vigorous tree, reasonably free of disease, with good structure and form typical of the species. 4 - A tree with slight decline in vigor, small amount of twig dieback, minor structural defects that could be corrected. 3 - A tree with moderate vigor, moderate twig and small branch dieback, thinning of crown, poor leaf color, moderate structural defects that may that might be mitigated with care. 2 - A tree in decline, epicormic growth, extensive dieback of medium to large branches, significant structural defects that cannot be abated. 1 - A tree in severe decline, dieback of scaffold branches and or trunk, mostly epicormic growth; extensive structural defects that cannot be abated. 0 - Tree is dead. SUMMARY OF FINDINGS HMH conducted a tree inventory of 62 trees located within the limit of work outlined in Exhibit A. Per City of Cupertino ordinance any tree removed needs to be mitigated. These requirements can be found under their protected tree ordinance. Chapter 14.18 Of the 62 trees on site the Camphor Tree and Canary Island Pine make up 58% of the site trees. Table 1 - Tree Quantity Summary summarizes tree quantities by both species and size. Each species that was inventoried as part of this scope is included. This is a useful tool for analyzing the mixture of trees as part of the project. Table 2 - Tree Evaluation Summary lists each tree number, botanical name, common name, DBH, circumference, ordinance trees, health rating, preservation suitability, general notes and observations. See Exhibit A for Existing Tree Map See Table 1 for Tree Quantity Summary by species and size. See Table 2 for Tree Evaluation Summary for sizes, notes and recommendations regarding each tree. Community Development Department FE-21Planning Division — Cupertino COPE RTINO Case# GEJJAUVAWSERVATIONS AND RECOMMENDATIONS Approval Bod�SjpAef' eMOM melanoxylon (Black Acacia) Approval Date Uan{y01 10/20 i ec en ations: Signature : 131 q Ta is h i moderate health. It is current) crowded b an offsite pine tree and adjacent ��� Y Y p� J Camphor tree. This crowding is creating some canopy structure defects and limiting natural development. Pruning the pine tree or removing the Acacia should be explored as to benefit one or the other. Species: Acer rubrum `Armstrong' (Armstrong Red Maple) Quantity: 11 Observations / Recommendations: All of the Red Maples are newly planted and are in good shape. Regular pruning by a qualified landscape contractor should be done as the trees mature to assure proper canopy structure. Species: Cinnamomum camphora (Camphor Tree) Quantity: 20 Observations / Recommendations: Almost all the Camphor trees are in poor shape. They are in a state of decline, show extensive crown dieback on many branches resulting in poor canopy development and structural defects. Trees 28-35 are in a very narrow planting strip adjacent to the building and have been pruned away from the building. These trees develop broad canopies so locating them here was improper. Species: Ligustrum (Privet) Quantity: 2 Observations / Recommendations: The Privet trees are generally classified as an invasive tree as they propagate voluntarily from other adjacent trees. It is uncertain if the two trees on the site were planted or were volunteers. Tree 9 is in a serious state of decline and should be removed, tree 12 has poor structure and crown die back. Species: Pinus canariensis (Canary Island Pine) Quantity: 16 Observations / Recommendations: The Pine trees are along the west side of the building and been pruned up over the top of the building which presents a top-heavy tree. This "lion tail" pruning method is not healthy for the tree structure and can create a hazard under high wind conditions. Other than that, the trees are in moderate shape. Species: Pyrus calleryana (Ornamental Pear) Quantity: 4 Observations / Recommendations: The Pyrus trees are in moderate shape. They have irregular canopy structure potentially due to poor maintenance practices. Many are showing signs of fire blight on a number of branches in the canopy and have some crown die back. Removal of these branches using proper pruning methods for fire blight should commence and these trees be monitored for the return of any symptoms. Community Development Department FE-21Planning Division — Cupertino CUPERTINO APPROVED Sped, jb _6bcus suber (Cork Oak) Case# n Approval Bod TR-2019: 032 Y3Igi / Recommendations: Approval Date ML ageed shape and should be protected in place. Signature Elleri luau Case Hager Species. equoia sempervirens (Coast Redwood) Quantity: 6 Observations / Recommendations: The Redwood trees are in good shape and look more recently planted. They are in close proximity to the building and are similar in shape and structure to the pine trees in the same location. The concern is the shape of these trees may face the same fate as the pines if they are being pruned above the roof line of the building. This should be discouraged. As redwoods are high water use plants any modification to the understory planting should take this into consideration from a hydrozone standpoint. Species: Xylosma congestum (Shiny Xylosma) Quantity: 1 Observations / Recommendations: The Xylosma is a shrub that has grown into a small tree. I it located under the caopies of . Community Development Department FE-21Planning Division — Cupertino C NO Ur' Case #O Case# RE ATION$ FOR TREE PROTECTION DURING CONSTRUCTION SiteT A Bail�'�: All existing trees shall be fenced off 10' beyond the outside the drip line (foliar Approval Bod : Adr�li —li in Approval Date pre. �� ��t r. Alternatively, where this is not feasible, fence to the drip line of the tree. Where i p ssi trunk shall be protected straw waddle and orange snow fencing. The SignatureMilud :�Jjqwmgwu C1 11111,imumf six feet high, made of pig wire with steel stakes or any material superior in quality, such as cyclone fencing. Tree protection zone sign shall be affixed to fencing at appropriate intervals as determined by the arborist on site. If the fence is within the drip line of the trees, the foliar fringe shall be raised to offset the chance of limb breakage from construction equipment encroaching within the drip line. All contractors, subcontractors and other personnel shall be warned that encroachment within the fenced area is forbidden without the consent of the certified arborist on the job. This includes, but is not limited to, storage of lumber and other materials, disposal of paints, solvents or other noxious materials, parked cars, grading equipment or other heavy equipment. Penalties, based on the cost of remedial repairs and the evaluation guide published by the international society of arboriculture, shall be assessed for damages to the trees. See tree preservation detail for additional information, including tree protection zone sign. Grading/excavating: All grading plans that specify grading within the drip line of any tree, or within the distance from the trunk as outlined in the site preparation section above when said distance is outside the drip line, shall first be reviewed by a certified arborist. Provisions for aeration, drainage, pruning, tunneling beneath roots, root pruning or other necessary actions to protect the trees shall be outlined by an arborist. If trenching is necessary within the area as described above, said trenching shall be undertaken by hand labor and dug directly beneath the trunk of the tree. All roots 2 inches or larger shall be tunneled under and other roots shall be cut smoothly to the trunk side of the trench. The trunk side should be draped immediately with two layers of untreated burlap to a depth of 3 feet from the surface. The burlap shall be soaked nightly and left in place until the trench is back filled to the original level. An arborist shall examine the trench prior to back filling to ascertain the number and size of roots cut, so as to suggest the necessary remedial repairs. Remedial repairs: An arborist shall have the responsibility of observing all ongoing activities that may affect the trees, and prescribing necessary remedial work to ensure the health and stability of the trees. This includes, but is not limited to, all arborist activities brought out in the previous sections. In addition, pruning, as outlined in the "pruning standards" of the western chapter of the International Society of Arboriculture, shall be prescribed as necessary. Fertilizing, aeration, irrigation, pest control and other activities shall be prescribed according to the tree needs, local site requirements, and state agricultural pest control laws. All specifications shall be in writing. For pest control operations, consult the local county agricultural commissioner's office for individuals licensed as pest control advisors or pest control operators. Final inspection: Upon completion of the project, the arborist shall review all work undertaken that may impact the existing trees. Special attention shall be given to cuts and fills, compacting, drainage, pruning and future remedial work. An arborist should submit a final report in writing outlining the ongoing remedial care following the final inspection. Community Development Department FE-21Planning Division — Cupertino C Case NO Q{ipR(7\/F Case# M +�L7'�V6ljryi`Jyj,C�T�I�J E RECOMMENDATIONS FOR TREES TO REMAIN ReAq_R2Q *fQUance, designed to promote plant health and vigor, ensures longevity of existing Approval Body: AYimi Hearn Approval Daterees. RE"Uspections and the necessary follow-up care of mulching, fertilizing, and pruning, Signature can j t ct them before they become damaging or fatal. Case Manager Tree Inspection: Regular inspections of mature trees at least once a year can prevent or reduce the severity of future disease, insect, and environmental problems. During tree inspection, four characteristics of tree vigor should be examined: new leaves or buds, leaf size, twig growth, and absence of crown dieback (gradual death of the upper part of the tree). A reduction in the extension of shoots (new growing parts), such as buds or new leaves, is a fairly reliable cue that the tree's health has recently changed. Growth of the shoots over the past three years may be compared to determine whether there is a reduction in the tree's typical growth pattern. Further signs of poor tree health are trunk decay, crown dieback, or both. These symptoms often indicate problems that began several years before. Loose bark or deformed growths, such as trunk conks (mushrooms), are common signs of stem decay. Any abnormalities found during these inspections, including insect activity and spotted, deformed, discolored, or dead leaves and twigs, should be noted and observed closely. Mulching: Mulch, or decomposed organic material, placed over the root zone of a tree reduces environmental stress by providing a root environment that is cooler and contains more moisture than the surrounding soil. Mulch can also prevent mechanical damage by keeping machines such as lawn mowers and string trimmers away from the tree's base. Furthermore, mulch reduces competition from surrounding weeds and turf. To be most effective, mulch should be placed 2 to 4 inches deep and cover the entire root system, which may be as far as 2 or 3 times the diameter of the branch spread of the tree. If the area and activities happening around the tree do not permit the entire area to be mulched, it is recommended that as much of the area under the drip line of the tree is mulched as possible. When placing mulch, care should be taken not to cover the actual trunk of the tree. This mulch -free area, 1 to 2 inches wide at the base, is sufficient to avoid moist bark conditions and prevent trunk decay. An organic mulch layer 2 to 4 inches deep of loosely packed shredded leaves, pine straw, peat moss, or composted wood chips is adequate. Plastic should not be used as it interferes with the exchange of gases between soil and air, which inhibits root growth. Thicker mulch layers, 5 to 6 inches deep or greater, may also inhibit gas exchange. Fertilization: Trees require certain nutrients (essential elements) to function and grow. Urban landscape trees may be growing in soils that do not contain sufficient available nutrients for satisfactory growth and development. In certain situations, it may be necessary to fertilize to improve plant vigor. Fertilizing a tree can improve growth; however, if fertilizer is not applied wisely, it may not benefit the tree at all and may even adversely affect the tree. Mature trees making satisfactory growth may not require fertilization. When considering supplemental fertilizer, it is important to consider nutrients deficiencies and how and when to amend the deficiencies. Soil conditions, especially pH and organic matter content, vary greatly, making the proper selection and use of fertilizer a somewhat complex process. To that end, it is recommended that the soil be tested for nutrient content. A soil testing laboratory and can give advice on application rates, timing, and the best blend of fertilizer for each tree and other landscape plants on site. Mature trees have expansive root systems that extend from 2 to 3 times the size of the leaf canopy. A major portion of actively growing roots is located outside the tree's drip line. Understanding the actual size and extent of a tree's root system before applying fertilizer is paramount to determine quantity, type and rate at which to best apply fertilizer. Always follow manufacturer recommendations for use and application. Community Development Department FE-21Planning Division — Cupertino CUPERTINO APP VED Pru r p n is often desirable or necessaryto remove dead, diseased, or insect -infested Case # �-_ -�01 4�� :g �........ +....,. structure, enhance vigor, or maintain safety. Because each cut has the tpRtMitJaJ_bi:3ghange the growth of (or cause damage to) a tree, no branch should be removed Approval BodwiWdpML Removing foliage from a tree has two distinct effects on growth: (1) it reduces Signature c�'r� I %n m„� - + y reduce overall growth. Pruning should always be performed g �P d ken not to over -prune as a tree may not be able to gather and a e Manager process enough sunlight to survive. Pruning mature trees may require special equipment, training, and experience. Arborists are equipped to provide a variety of services to assist in performing the job safely and reducing risk of personal injury and property damage (See also Addendum A - ANSI A300 Part 1 Pruning Standards). Removal: There are circumstances when removal is necessary. An arborist can help decide whether or not a tree should be removed. Professionally trained arborists have the skills and equipment to safely and efficiently remove trees. Removal is recommended when a tree: (1) is dead, dying, or considered irreparably hazardous; (2) is causing an obstruction or is crowding and causing harm to other trees and the situation is impossible to correct through pruning; (3) is to be replaced by a more suitable specimen, and; (4) should be removed to allow for construction. Pruning or removing trees, especially large trees, can be dangerous work. It should be performed only by those trained and equipped to work safely in trees. FM Community Development Department FE-21Planning Division — Cupertino CUPERTINO U Qp Case # TE ��LaiCUJD ONDITIONS TR-2019: 032 Approval Body: A in e rin Approval Dateie PMm terms and conditions apply to all oral and written reports and correspondence Signature consultations inspections and activities of HMH. Case Manager 1. The scope of any report or other correspondence is limited to the trees and conditions specifically mentioned in those reports and correspondence. HMH assumes no liability for the failure of trees or parts of trees, either inspected or otherwise. HMH assumes no responsibility to report on the condition of any tree or landscape feature not specifically requested by the named client. 2. No tree described in this report was climbed, unless otherwise stated. HMH does not take responsibility for any defects, which could have only been discovered by climbing. A full root collar inspection, consisting of excavating the soil around the tree to uncover the root collar and major buttress roots was not performed unless otherwise stated. HMH does not take responsibility for any root defects, which could only have been discovered by such an inspection. 3. HMH shall not be required to provide further documentation, give testimony, be deposed, or attend court by reason of this appraisal or report unless subsequent contractual arrangements are made, including payment of additional fees for such services as described by HMH or in the schedule of fees or contract. 4. HMH guarantees no warrantee, either expressed or implied, as to the suitability of the information contained in the reports for any reason. It is the responsibility of the client to determine applicability to his/her case. 5. Any report and the values, observations and recommendations expressed therein represent the professional opinion of HMH, and the fee for services is in no manner contingent upon the reporting of a specified value nor upon any particular finding to be reported. 6. Any photographs, diagrams, graphs, sketches or other graphic material included in any report, being intended solely as visual aids, are not necessarily to scale and should not be construed as engineering reports or surveys, unless otherwise noted in the report. Any reproductions of graphic material or the work produced by other persons, is intended solely for clarification and ease of reference. Inclusion of said information does not constitute a representation by HMH as to the sufficiency or accuracy of that information. 7. Trees can be managed, but they cannot be controlled. To live near trees is to accept some degree of risk. The only way to eliminate all risk associated with trees is to eliminate all trees. f , - ri 44 ly a " rm N .i •• •M • •Ln • • : • : • : • • N O N 1:T 00 JJ `' • N N { 00 r, a M M • � M in • O C% 00 • M M M N Nin • M MLM O - • •AWI r LU �:•-.•s0 Ln M N• .... • ZLLJ •� LLI H �• • i. N • •M [r' •� • °o M - ^ • O • • • • • • • 00 • •• • • •••o+ V • N M v 1A ►r1 U1 lf1 �p %O � 0 Ln Ln � r7 - �._ . 1 i y p �� per- ■ �p -�s- 1, Fes• "�1 � �y ' CED r 4 11Community !§ll, —21 Planninr o EE QUANTITY SUMMARY CUPERTINO APPROVED Case # DP-2019-001, Approval Body: A Approval Date 1gwity by Species S Quantity % of Site 1 2% Signature cerr`j um rms rong' 11 18% Cinnamomum camphora 20 32% Ligustrum 2 3% Pinus canariensis 16 26% Pyrus calleryana 4 6% Quercus suber 1 2% Sequoia sempervirens 6 10% Xylosma congestum 1 2% ITotal Trees 62 1 100%1 10 Z O a J W W W N LU ca LO r C) 2 0 0 — W o 2 H Z c W O 2 W W �_ W C) 2cu _ ❑ W 0 O 06 O a Q a 0 z w V, W (Q U V O U — a) O > O C Oco (D O T U a) N O c L � OL +" -0(pp E ° CL coL O c W L N w a) U) w E _0 m U) Y m C ui C > w O U m v°i E m � a c O_ U C a) f6 O O U c U) N CL U Q E N O N f0 O 2 U O U x c C O _ (6 _ °p Y E C O N N -0U O E � (6 a L U 7 c O o c -0 C U� •� -O N 7 Co C m U a) U) O C O a) •� U U U O U 70 u) he N N E C w O O O C (c0 C E U � p H @ O C O O a U C c O L O E -OO i U O _O C U) a) E ° > ui c U)a o> aa) o a) w m� C a) !0 O U N '�"' cL6 O 7 U In (n O) aa)) O � (0 E o o > ° 3 =° m E 0 o ai a m c o o m > c a) E - C: -a cn L > O t N m E U U L U O i c O W E° OU w e c _ -0 c -0 m Y o c a) C (D c O_ c N ) -C aM co U > f a �E EE cu 3 )a) �)o c ° 3 aEco > ac)0 L ° O a "° p Y o � a) E U)o fl U a) E Q(o a) c 6 N f6 O a c c a •c � O LU E a p O a) "U a N °c E ° cU) 3 > a i Oa 0 , o 0 23 ccmo 3 V aEm � E o z a) a) .2 w U— � L UQOU0 a O !E c p c a)o .. a) o 2 w ci 3 a) a) Ocn ( p m° c O o c U C c �6 O L .� E U n 8 � 7 E O� O U � " O 7 y O �� ca O>, :6 CO� a) N c U 7 L OO O N a) a) Q N � •c �j co O > E O p W ` Q O IL cn Ha) Ha) L n 6 Z u OU W7 c a E U . 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