Addendum to Arborist ReportCommunity Development Department
Planning Division — Cupertino
CUPERTINO APPROVED
Case # TR-2019-036
Application Number(s)
October 4, 2019
Approval Body: Director / Staff
Approva I Date Den0j/Il ifl r
uii ii m Go @ ai LELv
Signature 61141f8`Ewt Clinton Way, Ste. 201
Fresno, �FlaZeger
Subject: Forum - Additional tree removals
Cupertino
Dear Mr. Lindner:
HORT SCIENCE
BARTLETT CONSULTING
Construction is in progress at the Forum in Cupertino. Recent activities around Villa #61 and the
Memory Care facility require removal of three additional trees. Quiring has applied for the
additional removal permits, but the City of Cupertino requires an update to the arborist report.
HortScience, Inc. prepared an arborist report for the project in April 2017 and an addendum to the
report in August 2017. You asked HortScience I Bartlett Consulting (HBC) to evaluate impacts
and prepare an addendum to the 2017 arborist reports.
Two trees near the Memory Care facility will experience significant root impacts due to
construction of the retaining wall. The trees are Aleppo pine #87 (16" DBH) and red ironbark #89
(15" DBH). The trees have "moderate" and "low" suitability for preservation, respectively. Neither
is a Specimen tree.
The retaining wall will be 8' from trees; however,
the back cut for soil stabilization requires
excavation to within 6 inches of tree trunks (Fig.
1). Approximately 50% of the root zones of each
tree will be impacted. Because root removal this
close to trunks would compromise tree stability,
and tree health would be negatively impacted,
removal is recommended for both trees.
Fig
A third tree will be impacted by construction near
Villa #61. Coast live oak #189 (10" DBH) is a Specimen tree in good condition. It is located
downslope from the villa and is within the OSHA -required back cut for retention basin 6.
Relocating the basin is not possible due to site constraints, therefore tree #189 cannot be
preserved in place.
Quiring and HIBC explored the possibility of transplanting the tree. To ensure successful
relocation, a large volume of soil would need to be removed to capture enough roots around the
tree. Engineers were concerned that, because Villa #61 foundation is located directly upslope
from the tree, removing a large amount of soil would compromise foundation stability (foundation
has already been prepared). The chance that the tree would survive relocation would be greatly
reduced if the tree were removed with a smaller rootball. For these reasons, tree #189 is also
recommended for removal.
In summary, three trees are recommended for removal; one (#189) is a Specimen tree. Based on
the 2017 reports, a total of 327 trees were tagged and evaluated for the project; 41 were
HortScienceI Bartlett Consulting . 325 Ray St. Pleasanton, CA . 925.484.0211 . www.hortscience.com
CUPERTINO
Additional tree removal addendum — Forum
October 4, 2019
Community Development Department
HortScience I Bartlett Consulting
Page 2
Ply,p;OgeQiVWPM fitl-(7tti,PQdtikl nal 3 trees identified for removal in this report, a total of 145
trees woA10A6r fed for project construction, 17 of which were Specimen trees.
Case # PleasTeiAUYC�/ou have any questions about my observations or recommendations.
Application Number(s)
Sincerely,
Approval Body: Director / Staff
Approva I Date,, 01 /06/V ,
Signature Ellen Yau
Deanne&qkk4ed,er
Registered Consulting Arborist #647
HortScienceI Bartlett Consulting . 325 Ray St. Pleasanton, CA . 925.484.0211 . www.hortscience.com