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October 2, 2020 Heide Antonescu Trumark Homes LLC 3001 Bishop

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October 2, 2020 Heide Antonescu Trumark Homes LLC 3001 Bishop October 2, 2020 Heide Antonescu Trumark Homes LLC 3001 Bishop Drive, Suite 100 East Palo Alto, CA 94303 Subject: Revised Arborist Evaluation, Kassis Property, Rancho Cordova, Sacramento County, California (PN 2332-01) Dear Ms. Antonescu: Per your request, Live Oak Associates (LOA) has revised the arborist evaluation that was prepared on April 24, 2019 in support of the City of Rancho Cordova’s requirements for the development of a proposed subdivision on approximately 41 acres. The site is zoned residential, and formerly contained two residences, both of which were removed from the site in the late seventies. In the meantime, the site has been occupied by a mature walnut orchard. The project area is located north of Folsom Boulevard, west of Rod Beaudry Drive and east of the American River in Rancho Cordova, Sacramento County, California. The report is intended to identify all trees within and immediately adjacent to the site that could be affected by the proposed project. The report is to be used by the City of Rancho Cordova, their agents, and the property owners as a reference for existing tree conditions to help satisfy planning requirements. The Zoning of the property is FB-RMU (Folsom Blvd, Residential Mixed Use) (Medium Density Residential). There were previously two structures on the property between 1937 and 1979. Based on the City ordinance, tree species (other than oaks) that are 24 inches in diameter or greater are considered protected trees on residential sites. The lower threshold for protected oaks is 6 inches in diameter. Careful tree measurements consistent with the City’s tree ordinance revealed that of the 289 on-site trees greater than 12 inches diameter (or 6 inches for oaks), there are 147 trees on the site that meet the threshold to be protected by the ordinance for residential sites. An additional 45 perimeter trees were identified, but not measured since access to these trees generally was not possible. Based on review of the preliminary engineering drawings, 138 protected trees cannot be avoided and will need to be removed to accommodate the proposed development. BACKGROUND This arborist evaluation was prepared in compliance with the City of Rancho Cordova, Preservation and Protection of Private Trees (accessed October 22, 2018 from online: (https://www.codepublishing.com/CA/RanchoCordova/html/RanchoCordova19/RanchoCordova 1912.html#19.12.120) (Attachment 1). The ordinance requires that the arborist evaluation is prepared by an International Society of Arboriculture (ISA) Certified Arborist. The City defines a Protected Tree as a tree meeting the following criteria: “Protected tree" means: 1. Native oak - Quercus lobata, valley oak; Quercus wislizenii, interior live oak; Quercus douglasii, blue oak; or Quercus morehus, oracle oak - having a trunk diameter of at least six inches or greater; or 2. Any tree species other than a native oak having a trunk diameter of at least 12 inches or greater on nonresidential property; or 3. Any tree species other than a native oak having a trunk diameter of at least 24 inches or greater on residential property; or 4. Any tree planted as a requirement tree for site development, tree permit condition, landscape plan removal replacement, or other designated condition by the public works director or planning director. Furthermore, "Diameter at standard height" or "DSH" means the diameter of a tree measured at four and one- half feet above natural grade, except as specified below. The diameter shall be calculated by using the following formula: diameter equals circumference/3.14. 1. For a tree that branches at or below four and one-half feet, DSH means the diameter at the narrowest point between the grade and the branching point. 2. For a tree with a common root system that branches at the ground, DSH means the sum of the diameter of the largest trunk and one-half the cumulative diameter of the remaining trunks at four and one-half feet above natural grade. Protected trees are to be retained where possible, and where removal is necessary, mitigation, typically consisting of replacement trees, is required. Non-protected trees don’t require Live Oak Associates, Inc. 2 Kassis Property Arborist Evaluation replacement and are not the subject of this report. Therefore, trees not meeting the definition of protected trees are not discussed further. Tree protection measures have been provided as well in this arborist evaluation. The factors most important to determining how trees respond to disturbance near the roots include species, tree age, tree condition, tree lean, soil type and site drainage. Mature trees are generally more sensitive than young trees. Approximately 90-95 percent of a tree’s root system is in the top three feet of soil, and more than half is in the top one foot of soil. A tree’s root system extends well beyond the tree’s dripline, often extending a distance equaling two to three times the tree’s height. Soil compaction is by far the most common way that construction damage harms and kills trees. Tree roots need crumbly, well-aerated soil to grow and to obtain oxygen, water and nutrients. Without good soil aeration, roots suffocate and the tree health eventually declines. Symptoms of stress caused by tree root stress may occur within weeks of the damage, but are more likely to take 5 to 10 years to fully develop. A stressed tree is more susceptible to further stress, or even mortality, from drought and/or insects and diseases. METHODS The arborist survey was completed on January 12, 13, February 2, and 3, 2019 by Ms. Wendy Fisher, an arborist certified by the ISA (Certified Arborist #WE-3872A; exp. 12-31-21) with the assistance of Mr. Todd Ellsworth (staff ecologist). A follow-up field visit was completed on May 13, 2019 by Ms. Fisher. Prior to the field visits, a review of the City’s Ordinance provided guidance on creating the field data sheet that includes all the information pertinent to this ordinance. All on-site trees were tagged using aluminum tree tags at breast height. The surveyors located, identified, measured DSH, estimated height and canopy diameter, and provided a condition rating (which assessed the health and condition) of all trees located on the 41 acres. Most on-site trees contained multiple trunks branched above ground level. Measurements outlined in the City tree ordinance were carefully adhered to. A tree’s condition percentage is a determination of its overall health and structure based on five aspects: roots, trunk, scaffold branches, twigs, and foliage. The following scale defines the condition ratings and percentages: 0 • 100% = Exceptional = Good health and structure with significant size, location or quality. 1 • 75% = Good = No apparent problems, good structure and health. 2 • 50% = Fair = Minor problems, at least one structural defect or health concern, problems can be mitigated through cultural practices such as pruning or a plant health care program. 3 • 25% = Poor = Major problems with multiple structural defects or declining health, not a good candidate for retention. 4 • 0% = Dead/Unstable = Extreme problems, irreversible decline, failing structure, or dead. Trees with canopies that overlap the boundaries of the site were also accounted for, and were documented on western, northern and eastern boundaries of the site. During the January and Live Oak Associates, Inc. 3 Kassis Property Arborist Evaluation February field visits, nuts and bark characteristics were used to differentiate between the pecan and the two Juglans sp. Foliage was in a state of decomposition on the ground, beyond the point of clear description. Leaf characteristics were observed during the May visit to verify the species identification. SURVEY RESULTS AND DISCUSSION Tree data collected in the field can be found in Attachment 2. The numbered locations on the map corresponded with the tree tags and the numbers in the right-hand column on each field data sheet. Representative photographs of protected trees on the site can be found in Attachment 3. Tree locations (which correspond to the tree tags) showing those to be removed have been mapped in Attachment 4. Trees to be protected are shown in Attachment 5. As shown in Table 1 and in Attachment 2, 147 protected trees occur within the (mostly) fenced boundaries of the site, based on the criteria outlined in the City’s tree ordinance for residential sites. Table 1. Protected Trees identified on the Kassis Property, a residential site, during the January/February Arborist Surveys, 2019. Latin Name Common Name CA Native Species Number of Trees Carya illinoinensis (formerly Carya pecan) Pecan No 5 Ficus carica Common Fig No 3 Fraxinus velutina Velvet Ash No 3 Juglans cinerea White Walnut No 3 Juglans regia x hindsii Cultivated Walnut No 121 Quercus wislizeni Interior Live Oak Yes 15 Total 1 147 The vast majority of the trees found on site are a hybrid between California black walnut (Juglans hindsii) and English walnut (Juglans regia). Scions of English walnut are often grafted with rootstock of our native species to make them more adaptable to soil and climate conditions, and resistant to insects and diseases. Depending on tree maintenance and pruning regimen, grafted trees will take on various characteristics of the two sets of genes. Field observations in May 2019 revealed that the nuts and leaves of most of these trees resembled California black walnut. A few trees had leaves that more closely resembled English walnut. Some trees had leaves of English walnut in the canopy and sprouts at the tree base of California black walnut. The majority of trees on the upper terrace were found to be almonds (Prunus dulcis).Most trees were planted in rows, and in very good health with a condition rating of 90-100%. No trees were found to be more than 50% dead.
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