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2022 11 01 - 11606 - 11636 Cedar Spring Ct Arborist Report (Rev) Community Development Department Planning Division — Cull iATy Arborist Services LLC CUPERTINQ APPROVED Certified Arborist WE#10724A Case # TR-2022-043 P.O. Box 6187 Application Numbers) San Mateo, CA 94403 650- 532-4418 Approval l3 :5EDirf6jQrpF ffd November 1", 2022 Approva I Date 05/25/23 Signature JTSETdjizgLA9AInc. Case Manager Site: 11636, 11626, and 11606 Cedar Springs Court, Cupertino CA Dear JTS Tree Expert Inc. As requested on Wednesday, June 291h, 2022, Kielty Arborist Services LLC was asked to write a letter supporting the tree removal of three Redwood trees that have outgrown their available space and are starting to cause various levels of property damage. Your concerns as to the future health and safety of the three Redwood trees has prompted this report. Method: All inspections were made from the ground; the trees were not climbed for this inspection. The trees in question were located on site by you and will be shown in a Google Earth image within this report. The trees were then measured for diameter at 54 inches above ground level (DBH or diameter at breast height). The trees were given a condition rating for form and vitality. The tree condition ratings are based on 50 percent vitality and 50 percent form,using the following scale. 1 - 29 Very Poor 30 - 49 Poor 50 - 69 Fair 70 - 89 Good 90 - 100 Excellent The height of the trees was measured using a Nikon Forestry 550 Hypsometer. The spread was paced off. Comments and recommendations for future maintenance are provided. Survey Key: DBH-Diameter at breast height (48 inches above grade) CON- Condition rating HT/SP- Tree height/canopy spread Community Development Department CPI: r ilnrg*rrgMi-si'(Vrt- Cupertino (2) CUPERTINO Survey: APPROVED Tree# c' DBH CON HT/SPComments Case # - - 55/25 Good vigor, poor form, at driveway, cracks Apequoia Number(s) in driveway, surrounded by concrete Approva I 1369,f:rEWbY00 Staff hardscapes, damaging sidewalk and street, Approva I Date 05/25/23 in a raised landscape area, codominant at 45 feet, damaging wooden retaining wall. Signature Emi Sugiyama 2 ReC (TM"ager 39.6 70 55/20 Good vigor, good form, at driveway, raising (Sequoia sempervirens) driveway slab by 6", large cracks in Address: 11626 driveway. 3 Redwood 33.3 65 50/20 Good vigor, fair form, driveway damage, (Sequoia sempervirens) root at root crown shaved in past, sidewalk Address: 11606 replaced in past near tree with unknown root trauma, codominant leader at 35' reduced in ast. r 1 r kk Showing tree locations PICTURES OF THE TREES AND DAMAGES PROVIDED ON PAGE 4 Community Development Department CWmNT*rf$i r#—Cupertino (3) CUPERTiNQ APPROVED Case # Su"LT3,-2022-043. T-h@ thF@@ 4@0 ,,, ,,,o� , .„ R A&?i'Apd trees (Sequoia sempervirens). The 3 trees were likely Ap li tion by ber(s) "Required'frees wring the development of the homes on this street and will require a tree Approva l BW..106K&W�t/ §{trees have caused extensive damages to the hardscapes on site including the Approva I DLR cenbO�j:�ys and curb and gutter and street. The trees are at high risk of interrupting rgruunu utilities s. The trees are located within small, landscaped areas Signature +tea w.gi sjjstaip thQ large R�R�Wood trees throughout their entire lifespan. In the past to reduce triolsiwrffflards areas of concreted have been shaved down or replaced with an unknown amount of root trauma for the replacement of the concrete. Redwood tree#1 is damaging the sidewalk, street, and adjacent driveway. Extensive damage to a small wooden retaining wall has also taken place. Redwood tree#1 is codominant at 50' as the tree has lost apical dominance. This can raise risk of a leader failure at the top of the canopy but could be mitigated through pruning. Redwood tree#2 is lifting the adjacent driveway by 6" and is also starting to cause damage to the sidewalk and street. Redwood tree#3 has had the sidewalk replaced near the tree in the past with an unknow amount of root trauma. The tree's root crown has been cut on the tree side. Roots this close to a large tree are likely needed for the tree's stability and would not be recommended. Recommendations: The Redwood trees in question have outgrown their available growing space and are causing significant property damage. This species is a poor species for a small area surrounded by hardscapes and conflicts due to root growth are imminent. Fixes to the damaged concrete areas have taken place in the past through grinding concrete or completely replacing concrete. New damage has been observed. Redwood tree#3 has had its root crown shaved in the past at the sidewalk. Cutting roots this close to the tree could easily destabilize the tree. Cutting roots at 8 feet from the trees could cause the trees to become hazardous as roots in this distance are critical for stabilizing the trees. It is recommended to remove the trees to fix the damages caused by the roots of the trees as root cutting would be needed closer than 8' from the trees. The caused damages cannot be remedied without causing damage to roots within the 8' area. The concrete areas are recommended to be protected by future root growth from replanted trees by a root barrier installed at the edge of the concrete. The trees will need to be replaced by the "Replacement Tree Guidelines" as seen in the tree removal ordinance for the city of Cupertino. Each tree is recommended to be replaced by a 36"box tree of a medium stature with root barriers installed and maintained. A tree such as a Chinese Pistache would be a good species selection. Community Development Department 1 no (4) CUPLRTINO APPROVED Table 14.18.160A-Replacement Tree Guidelines Case # - - Appllcati8iyjq 1p4k Size of Re moved Tr7Measurad 4%feet above grade) Replacement Trees Up to 12 inches` One 24"box tree Approval Body Ov®5�5j2�and up to 18 inches Two 24"box trees or One 36"box Approva I Date tree Signature E n1g I" ylgaandupto36inches Over 36 �es�anager One 36"box tree Heritage tree One 48"box tree Does not apply to R1,Al,A,RHS,and R2 zones except required privacy plantings trees in R1 zones The information included in this report is believed to be true and based on sound arboricultural principles and practices. Sincerely, David Beckham Certified Arbonst WE#10724A TRAQ Qualified kw L" ti- e. 6� f. Showing small growing area Showing codominant redwood tree#1 II f e..r o a\ v Community Development Department CPI: r ilnrg*rrgMi—si'(Vrt— Cupertino (6) CUPERTINQ APPROVED Case # TR-2022-043 Kielty Arborist Services Application Number(s) P.O. Box 6187 Approval Body: Director/ Staff San Mateo, CA 94403 Approval Date 05/25/23 650-532-4418 Signature Emi Suqiyama RBORIS T DISCLOSURE STATEMENT Case Manager 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: Z�)av_rd David Beckham Date: November 1st, 2022