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TR-2014-43b OFFICE OF COMMUNITY DEVELOPMENT �,> CITY HALL 10300 TORRE AVENUE•CUPERTINO, CA 95014-3255 C U P E RT!N O (408)777-3308•FAX(408)777-3333•planninq(a�cupertino.org September 19, 2014 A Plus Tree Service ' Atin: Sarah Hon " 5125 Port Chicago Hgwy Concord, Ca. 94520 SUBJECT: TREE REMOVAL PERMIT ACTION LETTER—Agplication TR-2014-43 This letter confirms the decision of the Director of Community Development, given on September 19, 2014, approving a Tree Removal Permit to allow the removal and replacement of a 48 Magnolia trees located in a an existing office complex (Cupertino Civic Center), located at 20450 Stevens Creek Boulevard. The application to remove the trees is approved with the following conditions: 1. APPROVED PROTECT This approval is based on the arborist report prepared by Sarah Hon (WE-9519A), dated May 16, 2014, consisting of eleven pages, including six site photos and removal and replacement site plans and a peer report prepared by Michael Bench (#WE-1897A), dated July 24, 2014, consisting of 2 pages, except as may be amended by conditions in this resolution. 2. TREE REPLACEMENTS The applicant is required to plant forty eight (48) 24-inch box trees in accordance with the Protected Tree Ordinance and approved tree replacement plan. Modifications to the tree species and location may be made to the approved replacement plan pending staff approval. The replacement trees shall be planted within 30 days of the effective approval date of this tree removal permit. 3. NOTICE OF FEES DEDICATIONS, RESERVATIONS OR OTHER EXACTIONS The Conditions of Project Approval set forth herein may include certain fees, dedication requirements, reservation requirements, 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 protest these fees, dedications, reservations, and other exactions, pursuant to Government Code Section 66020(a), has begun. If you fail to file a protest within this 90- day period complying with all of the requirements of Section 66020, you will be legally barred from later challenging such exactions. Staff has made the findings necessary to grant the tree removal permit in accordance with Section 14.18.180 of the Protected Trees Ordinance. Sincerely, � .---- . ` �' . Kaitie Groeneweg Assistant Planner City of Cupertino CC:Cupertino City Center,Attn:Marni Lopez,10400 Stevens Creek Blvd#130,Cupertino CA 95014 Prepared By: �� A Plus Tree, Inc � Sarah Hon A � P L U S ISA Certified Arborist#W�9519A �� T R E E S E R V I C E'� Date: 5/16/14 NOT YOUR AVERAGE TREE SERVICE Arborist Inspection of 48 Southern Magnolias 20450 Stevens Creek Blvd Assignment This report is concerning(48) forty-right Southern,Magnolias,Magnolia grandifloi�, located at 20450 Steven Creek Blvd, Cupertino, CA.These trees have been a concern in the past because of poor growing conditions and signs of stress over the years. The inspection was performed on March 19'", 2014. Observation During the visual inspection,I observed the following in all 48 Magnolia grandiflora (please see attached for photos and locations): - Dead wood and tip die-back - Yellowing/Chlorosis in leaves - Limited plant space in cont�-�iners not allowing for fuller canopy - Stunted growth Discussion Magnolia grandiflora are a more sensitive species than most. They are slow healers when diey are pruned or endure root cutting,are not great candidates for transplantation, and are sensitive nutrient supply in the soil.According to site plans, these trees were planted in their containers approximately 15 years ago. Magnolia grandiflora have an average growth rate of 24 inches per year,with a mature average height of 65 feet,yet these trees are barely reaching 20 ft. I believe the Magnolias have reached their lifetime in these cont�iiners due to root restriction."I'he canopy will only grow as healthy and as full as the roots�vill allow. If the roots are restricted and are lacking necessary nutrients, soil space and soil capacity,die canopy�vill reflect that stress in crown die back and yellowing.The restricted root space will not allow for the tree to grow,as it wo�ild in a natural environment to a height of 65 feet widi a�0 ft spreaci. Over time the growth in the tree will continue to fight for space, in turn, showing more signs of stress and further decline. Conclusion Given the location and space of these Magnolias (between two buildings with plenty of morning and afternoon shade) it seeins these were planted more for aesthetic reasons and to beautify a�valkway for pedestrians coming and leaving their offices.l'he Magnolias are reaching their life span widiin these cont�liners and will continue to decline. Since money is currendy being spent on annual pruning of the unsighdy deadwood,the money�vould be better spent in r-emoving these and replacing with a more suitable,and visually pleasing, species�•ith a long-term view of a inuch healthier life for its space.A few suit�lUle replacement species suggestions are: 1) Acer griseum- Paperbark Maple 2) Koelreuteria paniculata- Goldenrain Tree 3) Carpinus caroliniana-American Hornbe�un/Blue Beech Respectfully, ,.� ,A� - � � � � � �ak��- �a. d ; ; �.., �' l�.__. Sarah Hon � Certified Arborist#WE-9519A G �_ � ����—�� . ` G�' � ���'`' / � Attachment to Tree Removal Permit Application Project Address: 20450 Stevens Creek Blvd Circum. DBH Tree# Current Species (In.) (In.) Replacement Species (24" Box) 1 So. Magnolia 22 7 Cercis canadensis 2 So. Magnolia 19 6 Cercis canadensis 3 So. Magnolia 22 7 Acer griseum 4 So. Magnolia 25 8 Acer griseum 5 So. Magnotia 25 8 Acer griseum 6 So. Magnolia 25 8 Acer griseum 7 So. Magnolia 25 8 Acer griseum 8 So. Magnolia 25 8 Acer griseum 9 So. Magnolia 25 8 Acer griseum 10 So. Magnolia 25 S Acer truncatum 11 So. Magnolia 22 7 Acer truncatum 12 So. Magnolia 22 7 Acer truncatum 13 So. Magnolia 22 7 Acer truncatum 14 So. Magnolia 22 7 Acer truncatum 15 So. Magnolia 25 8 Acer truncatum 16 So. Magnolia 22 7 Acer truncatum 17 So. Magnolia 25 8 Acer truncatum 18 So. Magnolia 22 7 Acer griseum 19 So. Magnolia 22 7 Acer griseum 20 So. Magnolia 22 7 Acer griseum 21 So. Magnolia 22 7 Acer griseum 22 So. Magnolia 25 8 Acer griseum 23 So. Magnolia 25 8 Acer griseum 24 So. Magnolia 25 8 Cercis canadensis 25 So. Magnolia 25 8 Cercis canadensis 26 So. Magnolia 25 S Cercis canadensis 27 So. Magnolia 25 8 Cercis canadensis 28 So. Magnolia 25 8 Acer griseum 29 So. Magnolia 22 7 Acer griseum 30 So. Magnolia 25 8 Acer griseum 31 So. Magnolia 25 8 Acer griseum 32 So. Magnolia 25 8 Acer griseum 33 So. Magnolia 22 7 Acer griseum 34 So. Magnolia 28 9 Acer truncatum 35 So. Magnolia 22 7 Acer truncatum 36 So. Magnolia 22 7 Acer truncatum 37 So. Magnolia 22 7 Acer truncatum 38 So. Magnolia 25 8 Acer truncatum 39 So. Magnolia 28 9 Acer truncatum 40 So. Magnolia 25 8 Acer griseum Page 1 of 2 Attachment to Tree Removal Permit Application Project Address: 20450 Stevens Creek Blvd 41 So. Magnolia 25 8 Acer griseum 42 So. Magnolia 25 8 Acer griseum 43 So. Magnolia 25 8 Acer griseum 44 So. Magnolia 22 7 Acer griseum 45 So. Magnolia 25 8 Acer griseum 46 So. Magnolia 25 8 Acer griseum 47 So. Magnolia 25 8 Cercis canadensis 48 So. 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Page 6 of 6 � Cupertino City Center Permit Application Map of Trees 1-48 Replacement Locations Replacement Trees: (8) 24"Box Cercis canadensis [#'s 1,2,24,25,26,27,47,48] (26) 24"Box Acer grisum [#'s 3-9, 18-23,28-33,40-46] a ��� (14) 24"Box Acer truncatum �� `"� [#'s 10-17,34-39] 2£ � � , , � � 27 20400 Stev�ns Creek 61vd 28 29 f�r����,�,��., _ ����� � 2, 24 23 �0 � ��,�,_.���,�,:�� � �2 � CRC Heafth Graup 21 31 ���- ,�v.,�: � � � �� � . 20 32 �;,��A�,<��-��»„ . 0 �9 33 3 e ;:;7 0 ,$ .�� �. � ,�� .����.:� o ���� � ,�r ==, r�, 1 fj O o ?� , o ,A� �� ���; �E� �� 40 r<�•�s��.�,f�. � ���) �� o ;�,�,�:,,., ,�. �� �� 41 � o $ 42 � 43 � 20450 Stevens Creek Blvd 6 O E �,, � O S 45 0 4 46 �7 48 � . � . , .� o , ._ � o i . ��o� � 0 ����������L �„-�_���-�3 . �.. .��a: .� :� o ��� �-,� r�y _. � �t<-,'r: ,r.a,,.;.,:�}W�1 �. . .,_...... � .,.. . ..�; .. � . , ..,,;u,.�. ,.. �Y Map of Trees 1-48 Removal Locations �. �a..., �,,� 26 �„ �;�,� .��r, , � ��..4, �, 27 20400 Stevens Creek Blvd 28 29 � � :;����,a,,:�s� � 25 24 23 30 � ���°����,r���,�� ,� 22 CRC Neatth Group 21 31 �, � . � � _ O 20 32 �. a<�§;�,���� • O 19 33 35 37 18 34 36 �,,;����;� �,,�S,.;W � 0 o r :� �� 38 16 �� O 15 39 14 O 12 40 13 O ����.�,�w;��., � � 10 , ,, , �.. > �� � 41 9 $ 42 O � 43 0 20450 Stevens Creek Blvd 6 44 �_s_:r,a.� � � 4 47 � 5 � � 0 46 48 ,s � � O k:�, ,�, �. �, , �, ,ir-,,:'f -�s•t;d:ntc r:°' , � � O ���7 B i��:a. r '`�i�� :„��.�.=..-N::».-.F..-..,.eG,�..��.o.�� �isn°°"""'.�. . G �a�m .:a O �'/9'-/�f ' � � ���� . _. .... , � c � �".""�\ � _ ,.� `,,- Michael L.Bench ��� � . �:°��_ ��,�:o20f�.:,,�� � � Consulting Arborist . ;, �� � � (831) 594-5151 _ _ ���9�/� \.."L,,,,. \„q� 7327 Langley Canyon Road ���� � / � Prunedale,California 93907 _ G%�'1N"`'C�'(�`� -.+�e°��"r��y A Review of the Magnolia Trees Requested for Removal Cupertino City Center 20450 Stevens Creek Boulevard Cupertino, California Assignment I was asked by Katie Groeneweg, Assistant Planner, City of Cupertino, to review the application to remove and to replace 48 Magnolia trees at this location. Observations I inspected the trees and their circumstances on July 24, 2014. All of the 48 trees are Southern magnolia(Magnolia grandiflora) specimens. They have trunk diameters 7-8 inches in diameter consistently, and are all in Fair to Poor condition, resulting from having been planted originally in concrete pots. I did not measure each of the pots,but it appears that they are all the same size, or 5 feet 9 inches in width(inside diameter). This means that each 7-8 inch diameter tree has approximately 2.5 feet of lateral growing space. Here lies the problem. Ordinarily Southern magnolia(Magnolia grandiflora) performs well in this area, provided there inoderate irrigation is provided, provided there is sufficient drainage, provided there is sufficient lateral growing space, and provided the soil has reasonably good tilth(not coinpacted). However, these are the conditions needed by most species. In my experience, this species is no more sensitive than most other species. I have seen inature Southern magnolia specimens in this area develop a trunks of 36-48 inches DBH and have canopies 70-80 feet in width. The poor performance of these 48 inagnolia trees in pots, 5 feet 9 inches wide, should have been expected. Most experts list Southern magnolia as a large tree, which is appropriate in my experience. I know of no large trees that could be expected to perform well in pots of this size. Pots this size cannot support Medium size trees adequately. Not all Small trees would perform well in containers of this size. Thus, it should not be surprising that these Southern magnolia specimens have done poorly. Paperbark maple (Acer griseum) are the recommend replacement species.Acer griseum is essentially a moderate size tree, approximately 25-30 feet at maturity, provided it has adequate growing space. In my opinion, these pots are not adequate to expect that the Prepared by Michael L. Bench, Consulting Arborist Observations July 24, 2014 1 20450 Stevens Creek Blvd. Cupertino, California Acer griseum trees would reach maturity or have a long life span. I estimate that in approximately 15 years, they would also require replacement. In my opinion, only very small trees or dwarf trees could be expected to perform well and live a long life in this containers. A few small trees I could suggest are: Dwarf Japanese maple (Acer palmatum `Coonaria pygmy) Small Japanese maple (Acer palmatum `Fireglow') Dwarf Olive (Olea cultivar) Boxleaf Azara (Azara microphylla) No common Name (Michelia doltsopa) Even these will eventually out grow the containers. Should medium (i.e.,Acer griseum), or large trees would be required for design purposes, they should be replaced about every 15 years. Respectfully submitted, • e.�t�_ Michael L. Bench, Consulting Arborist International Society of Arboriculture Certification#WE 1897A American Society of Consulting Arborists Member Prepared by Michael L. Bench, Consulting Arborist Observations July 24, 2014 2