Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Attachment 16
V� Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net Assessment of Ten (10) Protected -Size Trees II® E. 'Main Street (Proposed Veterans Ali emoria0) Los Gatos, Casoforrnua Prepared for: Mr. Sean Mullin, Associate Planner Town of Los Gatos Community Development Department 110 E. Main Street Los Gatos, CA 95030 Field Visit: Walter Levison, Contract Town Arborist (CTA) 10/9/2017 Report by CTA 10/18/2017 ATTACHMENT s 1 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Version: 10/18/2017 Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture J Walter Levison 2017 All Rights Reserved J>> Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net Table of Contents 1.0 Summary 3 2.0 Assignment & Background 9 3.0 Town of Los Gatos — What Trees are Protected? 10 4.0 Recommendations 11 5.0 Tree Protection and Maintenance Directions per Town Code 17 6.0 Tree Replacement Standards — Los Gatos Town Code 21 7.0 Author's Qualifications 23 8.0 Assumptions and Limiting Conditions 24 9.0 Certification 25 10.0 Digital Images 25 11.0 Tree Data Table 26 12.0 Attached: Tree Location & Protection Fence Map Mark-up 33 2 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos. CA Version: 10/18/2017 Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture © Walter Levison 2017 All Rights Reserved Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-09901 drtree@sbcglobal.net 1.OSummary a. Matrix style overview of protected -size trees (non-exempt species, 4-inches diameter at 4.5 feet above grade). Below, the CTA (Contract Town Arborist). has outlined expected impacts to each tree, along with suggestions for adjustments to the plan set (if applicable) that will optimize tree survival over the long term. The CTA calculated the appraised value of each tree, which can be used as a tool for determining the proper security bond amount to have the applicant post with the Town as a hedge against site plan -related tree damages (if applicable). Appraised values can also be used to determine damage fees if trees are determined during or after construction to have been damaged such that mitigation is required. Mitigation replacement rate and size is noted for each tree in the case that removal or damage to trees occurs. Note: Only trees within relatively close proximity of proposed work are included in this initial tree study (e.g. tree trunks located between zero and 50 linear feet of grading, trenching, excavation, haul routes, landscaping, etc.). In the case of this Veterans Memorial ("VM") project, tree #21 was included at the corner of Pageant Avenue and East Main Street 75 to 80 feet offset from proposed work, since shut down of the existing turf grass lawn irrigation system during proposed site work related to the VM could have a severe negative effect on the tree (and on all ten of the survey trees) due to a loss of relatively good soil moisture which the trees may have become accustomed to over many decades of growth. Table 1.0(a) (REFER TO THE CTA'S TREE MAP MARKUP WHEN REVIEWING THIS MATRIX Line Number Tree Tag Number Common Name Large Protected Tree (LPT) Appraised Value Site plan changes or restrictions required to reduce impacts to "less than significant" Replacement Rate Per Canopy Lost Replacement Size Tree 1 21 Coast redwood Yes $33,100. None. Maintain heavy irrigation as active during entire work period. 4 24" box 2 22 Coast redwood $11,050. None. Maintain heavy irrigation as active during entire work period. 3 24° box 3of33 Site Address: 110 E. Mein Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Sudety of Consulting Arborists and Member of the International Society of Arboriculture CO Walter Levison 2017 All Rights Reserved Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 �` cell (415) 203-09901 drtree@sbcglobal.net Line Number Tree Tag Number Common Name Large Protected Tree (LPT)? Appraised Value Site plan changes or restrictions required to reduce impacts to "less than significant" Replacement Rate Per Canopy Lost Replacement Size Tree 3 23 Coast redwood ---- $26,300. -Maintain heavy irrigation as active during entire work period, 2x/week, 50 to 100 gallons per irrigation day. Hand water using various on -site garden hose systems, or use other means as necessary (e.g. tow -behind water tank/spray apparatus, etc.). -Keep new electrical conduit as shallow burial or place electrical over -grade as "no -dig" in special heavy duty steel conduit. Max. 6 inches total excavation cut depth (i.e. roughly 4 inches max. depth of cover), within 20 feet of tree trunk edge. -Use shallow -cut walkway spec for base section to avoid excavation deeper than 4 to 6-inches below grade for both walkway base and for walkway edging treatments. Use Tensar BX-1100 biaxial or triaxial geogrid as underlayment as necessary to reduce base section thickness by 50%. -Avoid all deep foundation footing excavation cuts for the area within 15 or 20 feet south of trunk edge if possible (e.g. wall footings, etc.). Use small diameter piers spaced as far as possible apart, with either a very shallow cut type grade beam spanning between piers, or a "floating grade beam" placed over soil grade as a no -dig system. -Review landscape irrigation trenching plans when available. Reduce or eliminate all irrigation trenching within 20 feet of trunk edge if possible, and use surface -laid irrigation piping such as UV -resistant flex tubing materials, etc. pinned down over the soil surface. Cover tubing with mulch as necessary. 4 . 24" box 4of33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Sodety of Consulting Arborists and Member of the International Society of Arboriculture e Walter Levison 2017 All Rights Reserved Version: 10118/2017 tO Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 1 ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net Line Number Tree Tag Number Common Name Large Protected Tree (LPT)? Appraised Value Site plan changes or restrictions required to reduce impacts to "less than significant" Replacement Rate Per Canopy Lost Replacement Size Tree 4 24 Coast redwood Yes $25,700. (All same as for tree #23 above). 4 24" box 5 25 Coast redwood ---_ $22,300. (Ail same as for tree #23 above). 4 24" box 6 26 Giant sequoia Yes $9,000. (Consider removal of tree, based on long-term limited usefulness of this tree in the landscape) 4 24" box 7 27 Coast redwood ---- $5,700. Maintain heavy irrigation. 2x/week. 50 to 100 gallons per irrigation day. Adjust alignment of proposed electrical (and irrigation pipe trench as applicable) to 20 feet offset from trunk edge, or place over -grade as a "no -dig" system in heavy duty steel conduit. 3 24" box 8 28 Coast live oak __-- $7,200 Adjust alignment of proposed electrical (and irrigation pipe trench as applicable) to 20 feet offset from trunk edge, or place over -grade as a "no -dig" system in heavy duty steel conduit. 4 24" box 9 29 Coast redwood Yes $33,000. (All same as for tree #23 above). 6 24" box 10 30 Coast redwood $8,,100 (All same as for tree #23 above). The new walkway base can match the depth of the existing older walkway base section. However, if during demolition it is found that roots 1-inch diameter or greater are present in the old walkway baserock base section, then excavation will need to stop at that elevation, and the old baserock be left intact as -is to avoid causing severe root loss to this tree. . 4 24" box 5 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the Incematfonal Society of Arboriculture 0 Walter Levlson 2017 All fights Reserved Version: J>> Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 1 ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 A A cell (415) 203-0990 / drtree@sbcglobal.net 2017 Town of Los Gatos In -lieu fee equivalent = $250 per each required 24" box mitigation tree planting not installed on the site. 1.0 (b) Summary of tree disposition and tree issues, based on the set of plans submitted to planning division in September, 2017: 1. TREES / NO IMPACTS EXPECTED: Two (2) trees #21 and #22 are far enough offset from proposed work that no impacts are expected, unless the trees are not provided with 2x/week heavy irrigation by some means to provide roughly 50 to 100 gallons of water per tree per irrigation day. Note that there is currently no irrigation plan sheet, and therefore irrigation pipe trench alignments were not assessed by the CTA as of the date of writing. 2. TREE REMOVALS / CTA: The CTA suggests considering removal of one (1) giant sequoia #26 due to health issues that limit the long term safe and useful landscape value of the tree. The tree is infected by Botryospheria sp. which is a common fungal pathogen that causes a slow decline in live twig density and extension over time. There is no cure for this disease, and the tree may only have five to ten years of remaining useful life (or less). If this tree is not removed as part of the Veterans Memorial project, then it may be difficult and therefore more costly to remove it later on once the memorial features are in place. 3. POTENTIAL IMPACTS FROM PROPOSED SITE PLAN WORK AS CURRENTLY SHOW ON PLAN SHEETS: a. WALKWAYS & WALKWAY EDGINGS: Proposed walkway base section excavation work and edging work may involve deep excavation cuts throughout the open soil root zone areas of trees #23, 24, 25, 26, 29, 30. Use of a biaxial or triaxial geogrid underlayment over the soil surface may allow for up to a 50% reduction in base section thickness, thereby allowing for reduced excavation depth of cut, while still matching finish grade elevations. Tensar BX-1100 is one of the preferred products for this application, and is locally available from Reed and Graham geosynthetics division in San Jose, CA. Phone: (408) 287- 1400. If possible, the geogrid material should be laid directly over the old baserock if there are tree roots coursing through it, or the material can be laid over the soil surface where the new walkway will be constructed through virgin soil root zone areas. Some contractors opt to lay down a woven geotextile over the ground before placing the geogrid. See the recommendations section below for spec images of geogrid installations on Walter Levison projects. Edgings will need to be rethought and redesigned to avoid deep excavation. Edgings that preserve tree roots are typically over -grade, or only 3 to 4 inches total cut depth below original soil grade elevations (i.e. elevations prior to grading). The current proposed edgings as per the current proposed plans appear to be much deeper than this recommended "tree friendly" cut depth maximum. 6of33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture ® Walter Levison 2017 All Rights Reserved Version: 10/18/2017 101 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net b. IRRIGATION PIPING / PERMANENT: Proposed landscape irrigation pipe trenching may involve deep cuts throughout the open soil root zone areas within 20 feet of all survey trees, although this cannot be verified since there is currently no irrigation plan sheet available for review. The solution to this potential tree root preservation problem is to simply use over -grade UV -resistant flex tubing as the irrigation supply piping, and lay mulch over the piping to cover, for all areas to be irrigated within 20 feet of the trunk edges of all survey trees. c. ELECTRICAL CONDUIT ROUTING: The proposed electrical conduit routing may be the single most damaging element of the entire VM plan, since this conduit is typically buried at roughly 18 to 24 inches "depth of cover", plus additional excavation to get the actual pipe diameter below that elevation. Engineers will sometimes allow for a reduced depth of cover at something on the order of 8 inches depth of cover over the pipe top, which equates to roughly 10 or more inches of total trench depth to get the pipe top down to 8 inches below surface grade elevations. This shallow cut spec will still cause significant root Toss and/or root damage to both lateral (horizontal) woody roots and to fine absorbing roots extending from the woody roots that are of much smaller diameters. The simple solution is to specify conduit installation using one of the following general specifications: 1. Realign the proposed conduit trenches such that they are at least 15 to 20 feet offset from the trunk edges of the trees being retained, or 2. Place the electrical in very shallow trenches (e.g. 4 inches cover, etc.) or over -grade, in heavy duty steel conduits that are vandal resistant and damage resistant to the greatest extent possible. Both of the above solutions tend to violate engineering specifications, and would need to be specially approved by Town Staff as measures designed specifically to preserve roots of the survey trees which are extremely valuable both in terms of their aesthetic importance to the community and in terms of their actual appraised values (see the CTA's valuations above in table 1.0(a)). d. VETERANS MEMORIAL LANDSCAPE WALL FOOTINGS AND OTHER FOOTINGS: All of the proposed foundation footings for landscape elements such as walls are shown conceptually in the current proposed plan set of sheets as deep T-footings or "spread footings". The notes in the plans, however, do mention that footings can be specified as "pier footings" to avoid cutting through tree roots. Although itis correct to assume that pier footings in themselves do allow for lateral woody roots to be preserved during the construction process, it is also very common for architectural and engineering specifications to show what is called a "grade beam" or "structural beam" spanning between the structural piers, to create shear strength for the wall. Unfortunately for trees, these so-called "grade beams" are typically specified in the plans as requiring burial of at least 18 to 24 inches depth when associated with a residence foundation, and roughly 12 to 18 inches depth of cut for applications such as garages or walls where less structural value is required to be built into the system. Given this over -build mentality that is the norm in modern engineering and architectural standards, it is very difficult for arborists to get shallow cut type specifications (or "no dig" specifications) approved by Town and City Staff. 7of33 Site Address: 110 E. Main Street (Veterans' Memorial) Loa Gatos, CA Version: 10l18/2017 Reglstersd Member, American Society of Consulting Arborists and Member of the International Sodety of Arborictittre e Walter Levlson 2017 All lights Reserved 10) Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified 1 ISA Certified Arborist MC-3172 The CTA suggests that for the VM site, we use the following tree -friendly standards: 1. Piers only, for all walls and other items requiring foundation footings, instead of spread footings or T-footings. 2. Minimize pier diameters (e.g. use 8 to 12 inch diameter piers, instead of 18 to 24 inch diameter piers, pending engineer signoff of these diameters) to avoid causing unnecessary root loss or root damage during pier drilling. 3. Relocate piers as needed if tree roots greater than 2 inches diameter are encountered during pier drilling. 4. Maximum grade beam cut depth of roughly 4 to 6 inches below existing grade as the standard for this project for all proposed new wall areas that span between the piers, in order to avoid severe root loss and tree decline/death that may occur as a result of the VM excavation work. A CA cell (415) 203-09901 drtree@sbcglobal.net 5. Keep walkway base section base excavation to a maximum of 4 to 6 inches total cut depth below existing grades for all areas within 20 feet of trees, and use Tensar BX-1100 biaxial or triaxial geogrid (as recommended above in `walkways' ) as an underlayment to thin out the base section to the greatest extent possible. 6. Walkway edgings will need to be minimized to conform to the above specs, such as a maximum of 4 to 6 inches total cut depth for new edging installations along new walkways. e. IRRIGATION TEMPORARY VS. SOIL MOISTURE DEFICIT: The CTA is concerned that the existing irrigation system providing soil moisture for the turf lawn will be completely shut down during the VM project work period. All of the trees within roughly 100 feet or so of the project could be negatively affected by this shutdown, and could even decline rapidly and die as a result of soil moisture deficit (SMD) due to lack of regular irrigation. Trees that are provided with supplemental irrigation over the course of many decades become very dependent on this soil moisture, and tend to grow shallow root systems that are able to take advantage of this shallow spray type irrigation. If for any reason the irrigation is reduced or stopped for even one or two weeks, the tree(s) can suffer severely, exhibiting twig, branch, and foliar decline which can lead to premature death of the tree. In the case of our site, the redwood specimens are extremely valuable both in terms of their incalculable aesthetic contribution to the landscape, and their monetary value which has been established above by the CTA in table 1.0(a). The value of the coast redwoods in this tree study alone exceeds $160,000. In order to avoid an SMD situation during construction of the VM, we will need to have various methods of applying water to the site in high volume during the work, such as but not limited to garden hoses on existing hose bibs to remain active, soaker hoses, water trucks, tow -behind water tank/spray apparatus, or simply a patched pipe system and garden hose affixed to that patched pipe and hose bib. 8 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Version: 10/18/2017 Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture ® Walter Unison 2017 All Rights Reserved Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 4. SECURITY BONDING: cell (415) 203-0990 r drtree@sbcglobal.net The new 2015 iteration of the Town tree ordinance section 29.10.1000 (c)3 includes wordage that requires that all trees being retained on a development site need to be appraised for dollar value at the applicant's expense prior to building or grading permits being issued by the Town. Part 'f of this same tree ordinance section states that the Town may condition a security bond prior to issuance of a permit, in the sum of $5,000 per each tree being preserved, or $25,000, whichever is less. It would be reasonable, based on the actual appraised values of trees being retained at this site, for the Town to condition the project approval upon posting of a security bond in the amount of $25,000, which is far less than the total appraised value of the survey trees being retained in close proximity to proposed site work as currently proposed on sheets dated September, 2017. However, given that the trees are Town -owned specimens, the bond may need to be posted by the contractor working on this project (Flanders Bay Co.). 2.0 Assignment & Background Walter Levison, Contract Town Arborist (CTA) was directed to tag and assess all Protected -Size (4 inch diameter and greater) trees in relatively close proximity to the proposed Veterans Memorial project on Town property. Tree #21 was included due to the fact that a shut -down of irrigation to the turf lawn could have a severe negative effect on the tree's health, even though this specimen is located 80 feet from the nearest proposed root zone impacts. Ten (10) trees #21 through #30 were included in the CTA's initial study. The trees were tagged with numeric tags affixed to the mainstem of each tree at roughly eye -level. These tag numbers are noted on the CTA's tree map markup attached to the end of this written report. The CTA summarized the tree situation from a long-term site manager's perspective, both in table form and, in written form above, in section 1.0. Specific recommendations for tree maintenance and protection are outlined below in section 4.0. Digital images of the trees archived by the CTA are included below in this report for reference of existing pre -project conditions. The tree data table with detailed tree information based on the CTA's field assessment on 10/9/2017 makes up section 11.0 of this report. The CTA used a forester's D-tape to determine trunk diameter at 4.5 feet above grade, or at a narrow point below a mainstem fork if the fork occurs at 4.5 feet above grade. The D-tape converts actual trunk circumference into diameter in inches and tenths of inches. Tree heights were measured using a digital Nikon forestry pro 550 hypsometer. Tree canopy spread was visually estimated. The attached tree map mark-up prepared by the CTA was created using the applicant's grading and drainage plan sheet, marked up with various highlight coloration' as discussed in section 12.0. 1 Adobe Pro was used to mark up the tree map. In order to "lock" the mark-ups, the CTA printed a PDF of the marked -up PDF sheet, which resulted on some loss of color intensity. 9of33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Version: 10/18/2017 Registered Member, American Society of Consulting A►badsts and Member of the Irrsemalicnal Society of Arboriculture 03 Walter Levison 2017 All Rights Reserved OPWalter Levison CONSULTING ARBORIST Ai` ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net 3.0 Town of Los Gatos — What Trees are Protected? Per the most recent (2015) iteration of the Town of Los Gatos tree ordinance (Town Code Chapter 29 — Zoning Regulations, Article 1), the following regulations apply to all trees within the Town's jurisdiction (wordage adjusted): 1. All trees with at least a single mainstem measuring four (4) inches diameter or greater at 4.5 feet above grade are considered "Protected Trees" when removal relates to any development review. 2. 12 inch diameter (18 inch multistem total) trees on developed residential property not currently subject to development review. 3. 8 inch diameter (8 inch multistem total) blue oak (Quercus douglasii), black oak (Quercus kellogii), California buckeye (Aesculus californica), and Pacific madrone (Arbutus menziesii) on developed residential Tots not currently subject to development review. 4. 8 inch diameter (8 inch multistem total) trees on developed residential property not currently subject to development review, on lots in the designated Hillside Area per the official Town map. 5. All trees with a single mainstem or sum of multiple mainstems totaling 48 inches diameter or greater at 4.5 feet above grade are considered "Large Protected Trees" (LPT). 6. All oak species (Quercus spp.), California buckeye (Aesculus californica), and Pacific madrone (Arbutus menziesi►) with one or more mainstems totaling 24 inches diameter or more at 4.5 feet above grade are considered "Large Protected Trees" (LPT). 7. Section 29.10.0965. Prohibitions: A permit is required to prune, trim, cut off, or perform any work, on a single occasion or cumulatively, over a three- year period, affecting 25% or more of any Protected Tree (including below ground root system). 8. Section 29.10.0965. Prohibitions: A permit is required to prune, trim, or cut any branch or root greater than four (4) inches in diameter of a Large Protected Tree. 9. Section 29.10.0965. Prohibitions: A permit is required to conduct severe pruning on any protected tree. Severe pruning is defined in section 29.10.0955 as "topping or removal of foliage or significant scaffold limbs or large diameter branches so as to cause permanent damage and/or disfigurement of a tree, and/or which does not meet specific pruning goals and objectives as set forth in the current version of the International Society of Arboriculture Best Management Practices -Tree Pruning and ANSI A300-Part 1 Tree, Shrub, and Other Woody Plant Management -Standard Practices, (Pruning)." 10. Exceptions: Severe Pruning Exception in Town Code section 29.10.1010(3) " except for pollarding of fruitless mulberry (Morus alba) or other species approved by the Town Arborist....". Protected Tree Exceptions: a. Edible fruit or nut bearing trees less than 18 inches diameter (multistem total or single stem) 10 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the international Society of Arboriculture @Walter Levison 2017 All Rights Reserved Version: 10/18/2017 1)) Walter Levison CONSULTING ARBORIST aikt. ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net b. Acacia melanoxylon (blackwood acacia) less than 24 inches (multistem total or single stem) c. Liriodendron tulipifera (tulip tree) less than 24 inches (multistem total or single stem) d. Ailanthus altissima (tree of heaven) less than 24 inches (multistem total or single stem) e. Eucalyptus globulus (Tasmanian blue gum) less than 24 inches (multistem total or single stem) f. Eucalyptus camaldulensis (River red gum) less than 24 inches (multistem total or single stem) g. Other eucalyptus species (E. spp.) not noted above, less than 24 inches (multistem total or single stem) (REMOVAL O.K. ONLY AT HILLSIDE AREA LOCATIONS PER OFFICIAL TOWN MAP): www.losuatosca.uov/documentcenter/view/176 h. All palm species (except Phoenix canariensis) less than 24 inches (multistem total or single stem) Ligustrum lucidum (glossy privet) less than 24 inches (multistem total or single stem) Note that per the exception in part 'a' above, fruiting olive trees with stems totaling less than 18 Inches are considered non -protected. 4.0 Recommendations 1. Project Arborist ("PA"): Initial Signoff It is suggested that a third party ASCA registered consulting arborist or ISA Certified Arborist with good experience with tree protection during construction be retained by the applicant, to provide pre -project verification that tree protection and maintenance measures outlined in this section of the arborist report are adhered to. Periodic (e.g. monthly) inspections and summary reporting, if required as a project condition of approval, are suggested in order to verify contractor compliance with tree protection throughout the site plan project. This person will be referred to as the project arborist ("PA"). The PA should monitor soil moisture within the root protection zones of trees being retained, using a Lincoln soil moisture probe/meter or equivalent. If required, inspection reports shall be sent to Mr. Sean Mullin, Associate Planner, at smullinaloscatosca.sQo Sample wordage for a condition of approval regarding monitoring of tree protection and tree condition: "The required protective fencing shall remain in place until final landscaping and inspection of the project. Project arborist approval must be obtained and documented in a monthly site activity report sent to the Town. A mandatory Monthly Tree Activity Report shall be sent at least once monthly to the Town planner associated with this project (smullin(calosoatosca.aov) beginning with the initial tree protection verification approval letter" The PA should work with the project team to directly monitor a portion of the following items such as, but not limited to: a. Walkway base and walkway edging excavation and trenching within 20 feet of trees. b. Wall foundation pier drilling and grade beam excavation (if any) within 20 feet of trees. c. Landscape irrigation pipe trenching (if any) within 20 feet of trees. d. Landscape plant pit digging within 20 feet of trees. e. Electrical conduit trenching within 20 feet of trees. f. Temporary irrigation (heavy) 2x/week, 50 gallons per tree per irrigation day (i.e. 400 gallons per tree per month), throughout the entire fenced off "root protection zone" (RPZ) chain link panel -protected areas. 11 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture ® Walter Levlson 2017 All Rights Reserved Version: 10/18/2017 10 Walter Levison CONSULTING ARBORIST A` ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net 2. Project Team Pre-Proiect Actions or Clarifications Requested: i. Trees To Consider for Removal: It is suggested that the Town consider removal of tree #26. Removal of the tree would be much more difficult once the site plan project commences or once the newly built memorial facility is completed. See also recommendation #7 regarding redwood #24. ii. Electrical Conduit Realignment: It is suggested that electrical conduit alignments be adjusted to at least 15 or 20 linear feet offset from the trunks of trees #23, 24, 25, 26, 27, and #28. Alternatively, if the conduit sections need to be cut along areas within 20 feet of a tree, either shallow -dig the conduit using a special specification such as "4 inches of cover", or use an over -grade floating "no dig" specification involving heavy duty type conduit material that is both highly crush -resistant and vandal -resistant. iii. Walkway Base and Walkway Edqing Cut Depths: Keep new walkway base excavation cut depths to a maximum of 4 to 6 inches below existing grade elevations. Use Tensar BX-1100 biaxial geogrid or a triaxial geogrid to allow the base section thickness to be reduced by as much as 50%, thereby allowing for shallower excavation cut depths than would otherwise be possible. Optionl: Use a "crowned" system as shown at right as applicable, to allow for shallower total cut depths. The crowned system requires a tapered edging to comply with ADA requirements, as shown at right. Keep all new walkway edging treatments (edge constraints, etc.) to a &4LKFILL AS NEEDED NMI NAME Set 'WWI& D TJI OF MEE NMI 4' AC PRESSURE NEM rem DOUGLAS ARAM ROOTZONES OF SENSIME TREES 19ONNE EJuST V SOIL 12 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the Intemational Society of Arboriculture @Walter Lev son 2017 All Rights Reserved Version: 10/18/2017 Waiter Lemon CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified 1 ISA Certified Arborist #WC-3172 I` cell (415) 203-09901 drtree(sbcglobal.net maximum cut depth of 4 inches below original grade. If possible, use an edging that requires only 4 inches of cut depth, matching the depth of the walkway base section excavation cut depth and the edging cut depth as shown in the image above right. At right is a sample specification copyrighted by Jim Lauderbaugh, Landscape Architect showing how geogrid is installed over grade as a crucial component of a "no dig" system whereby there is zero excavation for base rock. In this scenario, the base rock is tamped down over the geogrid itself, and the entire sandwich of materials is laid over existing soil grade, thereby allowing for 100% tree root. preservation beneath the geogrid layer. iv. Wall Footino Types and Depth of Grade Beam Cut: Use small diameter piers as the main structural component of the proposed new walls. Pier diameter should be as small as possible. Pier spacing should be as wide as possible. Use hand -digging method for pier holes that are within 15 feet of a tree being retained. If roots measuring 2-inches diameter or greater are encountered during pier hole drilling or digging, then relocate the hole(s) to avoid destroying those roots. EXISTING HERITAGE l;ii1KTREE EDGE RESTRAINT"RYERSON" ]!4" X 5" STEEL EDGE &STAKES EX. CONC. COURTYARD & W4ALKTO BE Rr: OVED ROOTCOLLAR ROOTS PERMFARLP INTERLDCKING (AVERS (MANUFACTURER, SIZE AND PATTERN T.B.D.) QC PLANTING AREA GRA Np MIN. 3" LAYER OF BAP AASHTO NO.B (3/8") CRUSHED STONE BASE INF)LL PAVER JOINTS WITH SAME N0.B CRUSHED STONE MI FI FILTER FABRIC UNDISTURBED NATURAL GRAN DBL LAYER OF 4"-6" WASHED RIYERSTONE (MARNtAIN 6" CLEARANCE FROM TREE TRUNK) 3" LATER OF CLASS II • PERMEABLE AGGREGATE BASE HAND -TAMPED 110 MAX. 75968O% TENSAR Bx 1100 BIAXIAL GEOGitiD OVER EX. ROOT & SOIL SURFACE, BLI IYPICALSECT1ON 1-1/2u= 3.'-0" Grade beams, if needed, should be placed over -grade as floating "no dig" systems which are non-structural or less structural in function than would be a recessed grade beam below grade. Maximum cut for grade beams within 20 feet of trees being retained should be 4 to 6 inches of total cut below existing soil grade elevations. The sample image at right shows a small diameter pier -type wall next to a 200 year old coast live'oak specimen, with a block •type wall installation spanning between the piers that is set just 2 to 3 inches below grade to avoid damaging the root system of oak. The blocks were used in -lieu of a true "grade beam' system. v. Existinci Wall Demolition: 13 of 33 Site Address: 110 E. Mein Street (Veterans' Memorial) Los Gatos, CA Version: 10/18/2017 Registered Member, American Society of Consulting Arbarlsts and Member of the International Society of Arboriculture 0 Walter Levison 2017 All Rights Reserved Walter Levison AKA CONSULTING ARBORIST•--..�.T. ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net For existing walls to be demolished within 20 feet of a tree being retained, an arborist monitor is suggested to be present during removal of the wall foundation footings. There is a high likelihood that large diameter woody tree roots could be comingled with or otherwise entangled with the wall footings, and larger more important roots may need to be carefully pruned out using a Sawzall (see image at right) prior to the wall footing(s) being pulled out of the ground with an excavator bucket. If possible, pull footings vertically out of the ground in an upward motion to avoid lateral ripping of roots. vi. Statue, Bench. and Other Footings Within 20 Feet of Trees: All footings for all items such as benches and statues should be minimized in terms of depth to avoid unnecessary damage or destruction of tree root systems within 20 feet of trees. Use L-footings where possible, if a choice can be made between T-footings and L-footings. L-footings should be oriented such that the horizontal portion of the "L" is facing away from a tree, to avoid unnecessary excavation toward the tree. Use vertical pier -type footings where possible in order to minimize root loss during excavation within 20 feet of trees. vii. Landscape Irrigation / Permanent: All proposed irrigation within 20 feet of a tree shall be kept over -grade as a no -dig system. Use flexible tubing rated UV -resistant to allow the tubing to be placed on the soil surface. Pin down tubing using U-shaped steel landscape pins. Cover the surface irrigation tubing with mulch to hide it as necessary. The image at right shows '/" diameter professional grade Netafim flex tubing pinned down over a no -dig irrigation setup on a local area Walter Levison project in 2016 which allowed for 100% of the coast redwood tree roots to be preserved. Note the floating degraded granite pathway which is raised up in elevation, and involved no use of any baserock base section. viii. Landscape irrigation / Temporary During Construction: Determine if some irrigation water pipe systems are to remain active and running during the project work period. Tap into these systems by either patching in a temporary solid metal pipe system over -grade, to allow for temporary irrigation to occur during work, or simply run long garden hose pipes from the active hose bib that reach the RPZ fenced areas around site trees, so that twice weekly (2x/week) heavy irrigation can occur starting just prior to project commencement. The images at right show various options for temporary heavy irrigation of site trees during construction. 14 af 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture © Walter Levison 2017 All Rights Reserved Version: 10/1512017 Waiter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified I ISA Certified Arborist #WC-3172 ®` iw 1Ms mR nrtn. ar cell (415) 203-0990 I drtree@sbcglobal.net Supplemental water application should somewhat approximate 50 gallons per tree per irrigation day, twice a week, which would equate to about 400 gallons per tree per month (rough approximation of water needs for coast redwoods of very large size). 2 Recap: Do not allow the trees to go without heavy irrigation for more than 3 or 4 days at a time. Attempt to patch the existing turf lawn irrigation system into an alternative water source pipe, and maintain as active and running during construction for turf areas surrounding some of the study tree specimens. ix. Security Bond: It is suggested that Town Staff condition this' project on receiving security bond monetary funds from Flanders Bay Company in the amount of $25,000, as a hedge against potential decline or death of one or more of the survey trees to remain in close proximity to the proposed site plan project. Staff may choose to reduce this fee to a lesser amount. Actual total appraised value of the trees being retained in close proximity to work proposed at this site far exceeds $25,000. See table 1.0(a) for actual appraised values of the study trees. 3. Trunk Buffer Wrap Type III Protection: Prior to demolition commencement, install a trunk buffer around the lowermost 8 to 10 feet of :the mainstems of air survey trees being retained within roughly 80 linear feet of all proposed work (i.e. trees #21 through #30). Wrap approximately 10 to 15 wraps of orange plastic snow fencing around the trunk between grade and 8 feet above grade to create a padding at least 1 to 2 inches thickness. Stand 2x4 wood boards upright, side by side, around the entire circumference of the trunk. Affix using duct tape (do not use wires or ropes). See spec image at right. 4. Chain Link Fencing Type I and/or Type 11 Root Protection Zone (RPZ): Prior to commencing site demolition, erect chain link fencing panels set on moveable concrete block footings. Wire the fence panels to iron layout stakes pounded 24 inches into the ground at the ends of each fence panel to keep the fence route stabilized and in its correct position. Do not wire the fence panels to the trunks of the trees. 2 This standard is based on a watering regime suggested by Barrie D. Coate and Associates, Saratoga, CA for mature redwoods, which is calculated as 20 gallons per tree per month for each tingle inch of trunk diameter measured at breast height. This works out to 400 gallons per month for a 20-inch diameter coast redwood specimen. 15 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Version: 10/18/2017 Registered Member, American Society of Consulting Arbodsts and Member of the International Society of Arboriculture © Walter Levison 2017 All lights Reserved 0)) Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist#401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net Pre -construction fence: Per the red dashed lines on the tree map mark-up in the CIA's arborist report (routes may be subject to change, depending on the finalized alignments of work items). This fencing must be erected prior to any heavy machinery traffic or construction material arrival on site. The protective fencing must not be temporarily moved during construction. No materials, tools, excavated soil, liquids, substances, etc. are to be placed or dumped, even temporarily, inside the root protection zone or "RPZ". No storage, staging, work, or other activities will be allowed inside the RPZ except with PA monitoring. Note however that some RPZ fencing areas may need to be removed or moved to allow for final landscape plant and irrigation system installation to occur. 5. Signage: The RPZ fencing shall have one sign affixed with UV -stabilized zip ties to the chain link at eye level for every 20 linear feet of fencing, minimum 8"X11" size each, plastic laminated, with wordage that includes the Town Code section that refers to tree fence protection requirements (wordage can be adjusted): TREE PROTECTION ZONE FENCE ZONA DE PROTECCION PARA ARBOLES -NO ENTRE SIN PERMISO- -LLAME EL ARBOLISTA- REMOVAL OF THIS FENCE IS SUBJECT TO PENALTY ACCORDING TO LOS GATOS TOWN CODE 29.10.1025 PROJECT ARBORIST: TELEFONO CELL: EMAIL: 16 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Sodety of Consulting Arborists and Member of the International Society of Arboriculture © Walter Levison 2017 All Rights Reserved Version: 10/18/2017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 6. Water Spray: Aik\ cell (415) 203-0990 / drtree@sbcglobal.net Spray off foliage of all trees within 20 feet of construction activity using a very high power garden hose or a pressure washer system set on low pressure to wash both the upper and lower surfaces of foliage. This helps keep the gas portals (stomata) unclogged for better gas exchange which is crucial for normal tree function. Spray should be applied approximately once -monthly, or when ambient airborne dust concentration is unusually high. 7 Prunina and Other Long Term Maintenance: Specific pruning and other maintenance prescriptions (Rx) for trees, if they are retained in the landscape: • Retain a climbing arborist to aerial -inspect the fork at 85-feet above grade where it appears that the apical mainstem split out, resulting in growth of 55 foot tall epicormics shoots arising from the o?d split area. The tree's upper canopy area now consists solely of these enlarged stems. One or more of the epicormic shoots (stems) may need to be removed (or possibly the entire tree), based on the aerial inspection findings. • Monitor tree #26 for continued decline from Boiryospheria fungus infection. 5.0 Tree Protection and Maintenance Directions per Town Code The following is excerpted directly from the 2015 iteration of the Town of Los Gatos tree ordinance sections which provide specific tree protection directions and limitations on root pruning and above -ground pruning: Sec. 29.10.1000. New property development. (a) A tree survey shall be conducted prior to submittal of any development application proposing the removal of or impact to one or more protected trees. The development application shall include a Tree Survey Plan and Tree Preservation Report based on this survey. The tree survey inventory numbers shall correspond to a numbered metal tag placed on each tree on site during the tree survey. The tree survey plan shall be prepared bya certified or consulting arborist, and shall include the following information: (1) Location of all existing trees on the property as described in section 29.10.0995; 17 of 33 Site Address: 110 E. Main Sheet (Veterans' Memorial) Los Gatos, CA Version: 10/1612017 Registered Member, American Sodety of Consulting Arbadists and Member of the Ireasrnalional Society of Arboriculture 0 Walter Le%ison 2017 All Rights Reserved Walter Levison CONSULTING ARBORIST jeA\ ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree©sbcglobal.net (2) Identify all trees that could potentially be affected by the project (directly or indirectly- immediately or in long term), such as upslope grading or compaction outside of the dripline; (3) Notation of all trees classified as protected trees; (4) In addition, for trees four (4) inches in diameter or larger, the plan shall specify the precise location of the trunk and crown spread, and the species, size (diameter, height, crown spread) and condition of the tree. (b) The tree survey plan shall be reviewed by the Town's consulting arborist who shall, after making a field visit to the property, indicate in writing or as shown on approved plans, which trees are recommended for preservation (based on a retention rating of high/moderate/low) using, as a minimum, the Standards of Review set forth in section 29.10.0990. This plan shall be made part of the staff report to the Town reviewing body upon its consideration of the application for new property development; (c) When development impacts are within the dripline of or will affect any protected tree, the applicant shall provide a tree preservation report prepared by a certified or consulting arborist. The report, based on the findings of the tree survey plan and other relevant information, shall be used to determine the health and structure of existing trees, the effects of the proposed development and vegetation removal upon the trees, recommendations for specific precautions necessary for their preservation during all phases of development (demolition, grading, during construction, landscaping); and shall also indicate which trees are proposed for removal. The tree preservation report shall stipulate a required tree protection zone (TPZ) for trees to be retained, including street trees, protected trees and trees whose canopies are hanging over the project site from adjacent properties. The TPZ shall be fenced as specified in section 29.10.1005: (1) The final approved tree preservation report shall be included in the building permit set of development plans and printed on a sheet titled: Tree Preservation Instructions (Sheet T-1). Sheet T-1 shall be referenced on all relevant sheets (civil, demolition, utility, landscape, irrigation) where tree impacts from improvements may be shown to occur; (2) The Town reviewing body through its site and design plan review shall endeavor to protect all trees recommended for preservation by the Town's consulting arborist. The Town reviewing body may determine if any of the trees recommended for preservation should be removed, if based upon the evidence submitted the reviewing body determines that due to special site grading or other unusual characteristics associated with the property, the preservation of the tree(s) would significantly preclude feasible development of the property as described in section 29.10.0990; Approval of final site or landscape plans by the appropriate Town reviewing body shall comply with the following requirements and conditions of approval: a. The applicant shall, within ninety (90) days of final approval or prior to issuance of a grading or building permit, whichever occurs first, secure an appraisal of the condition and value of all trees included in the tree report affected by the development that are required to remain within the development using the Tree Value Standard methodology as set forth in this Chapter. The appraisal of each tree shall recognize the location of the tree in the proposed development. The appraisal shall be performed in accordance with the current edition of the Guide for Plant Appraisal published by the Council of Tree and Landscape Appraisers (CTLA) and the Species and Group Classification Guide published by the Western Chapter of the International Society of Arboriculture. The appraisal shall be performed at the applicant's expense, and the appraisal shall be subject to the Director's approval. b. The site or landscape plans shall indicate which trees are to be removed. However, the plans do not constitute approval to remove a tree until a separate permit is granted. The property owner or applicant shall obtain a protected tree removal permit, as outlined in section 29.10.0980, for each tree to be removed to satisfy the purpose of this division. (3) 18 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture ® Walter Levison 2017 All Rights Reserved Version: 10/18/2017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree(tsbcglobal.net (d) Prior to acceptance of proposed development or subdivision improvements, the developer shall submit to the Director a final tree preservation report prepared by a certified or consulting arborist. This report shall consider all trees that were to remain within the development. The report shall note the trees' health in relation to the initially reported condition of the trees and shall note any changes in the trees' numbers or physical conditions. The applicant will then be responsible for the loss of any tree not previously approved for removal. For protected trees, which were removed, the developer shall pay a penalty in the amount of the appraised value of such tree in addition to replacement requirements contained in section 29.10.0985 of this Code. The applicant shall remain responsible for the health and survival of all trees within the development for a period of five (5) years following acceptance of the public improvements of the development or certificate of occupancy. (e) Prior to issuance of any demolition, grading or bui:ding permit, the applicant or contractor shall submit to the Building Department a written statement and photographs verifying that the required tree protection fence is installed around street trees and protected trees in accordance with the tree preservation report. (f) If required by the Director and conditioned as part of a discretionary approval, a security guarantee shall be provided to the Town. Prior to the issuance of any permit allowing construction to begin, the applicant shall post cash, bond or other security satisfactory to the Director, in the penal sum of five thousand dollars ($5,000.00) for each tree required to be preserved, or twenty-five thousand dollars ($25,000.00); whichever is Tess. The cash, bond or other security shall be retained for a period of one (1) year following acceptance of the public improvements for the development and shall be forfeited in an amount equal to five thousand dollars ($5,000.00) per tree as a civil penalty In the event that a tree or trees required to be preserved are removed, destroyed or severely damaged. (g) An applicant with a proposed development which requires underground utilities shall avoid the installation of said utilities within the dripline of existing trees whenever possible. In the event that this is unavoidable, all trenching shall be done using directional boring, air -spade excavation or by hand, taking extreme caution to avoid damage to the root structure. Work within the dripline of existing trees shall be supervised at all times by a certified or consulting arborist. (h) It shall be a violation of this division for any property owner or agent of the owner to fail to comply with any development approval condition concerning preservation, protection, and maintenance of any protected tree. (Ord. No. 2114, §§ I, II, 8-4-03) Sec. 29.10.1005. Protection of trees during construction. (a) Protective tree fencing shall specify the following: (1) Size and materials. Six (6) foot high chain link fencing, mounted on two-inch diameter galvanized iron posts, shall be driven into the ground to a depth of at least two (2) feet at no more than 10-foot spacing. For paving area that will not be demolished and when stipulated in a tree preservation plan, posts may be supported by a concrete base. (2) Area type to be fenced. Type I: Enclosure with chain Zink fencing of either the entire dripline area or at the tree protection zone (TPZ), when specified by a certified or consulting arborist. Type II: Enclosure for street trees located in a planter strip: chain link fence around the entire planter strip to the outer branches. Type III: Protection for a tree located in a small planter cutout only (such as downtown): orange plastic fencing shall be wrapped around the trunk from the ground to the first branch with 2-inch wooden boards bound securely on the outside. Caution shall be used to avoid damaging any bark or branches. Duration of Type I, II, III fencing. Fencing shall be erected before demolition, grading or construction permits are issued and remain in place until the work is completed. Contractor shall first obtain the approval of the project arborist on record prior to removing a tree protection (3) 19 of 33 Site Address: 110 E Man Street (Veterans' Memorial) Los Gatos, CA Vereioi: 10118/2017 Registered Member. American Society of Consulting Arbodsts and Member of the International Society of Arboriculture © Welter Levison 2017 Al Rights Reserved Walter Levison AgA CONSULTING ARBORIST =,,1:2=A- ASCA Registered Consulting Arborist #401 1 ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net fence. (4) Warning sign. Each tree fence shall have prominently displayed an 8.5 x 11-inch sign stating: 'Warning —Tree Protection Zone -this fence shall not be removed and is subject to penalty according to Town Code 29.10.1025". (b) All persons, shall comply with the following precautions: (1) Prior to the commencement of construction, install the fence at the dripline, or tree protection zone (TPZ) when specified in an approved arborist report, around any tree and/or vegetation to be retained which could be affected by the construction and prohibit any storage of construction materials or other materials, equipment cleaning, or parking of vehicles within the TPZ. The dripline shall not be altered in any way so as to increase the encroachment of the construction. (2) Prohibit all construction activities within the TPZ, including but not limited to: excavation, grading, drainage and leveling within the dripline of the tree unless approved by the Director. (3) Prohibit disposal or depositing of oil, gasoline, chemicals or other harmful materials within the dripline of or in drainage channels, swales or areas that may lead to the dripline of a protected tree. (4) Prohibit the attachment of wires, signs or ropes to any protected tree. (5) Design utility services and irrigation lines to be located outside of the dripline when feasible. (6) Retain the services of a certified or consulting arborist who shall serve as the project arborist for periodic monitoring of the project site and the health of those trees to be preserved. The project arborist shall be present whenever activities occur which may pose a potential threat to the health of the trees to be preserved and shall document all site visits. The Director and project arborist shall be notified of any damage that occurs to a protected tree during construction so that proper treatment may be administered. (Ord. No. 2114, §§ I, II, 8-4-03) Sec. 29.10.1010. Pruning and maintenance. All pruning shall be in accordance with the current version of the International Society of Arboriculture Best Management Practices —Tree Pruning and ANSI A300-Part 1 Tree, Shrub and Other Woody Plant Management —Standard Practices, (Pruning) and any special conditions as determined by the Director. For developments, which require a tree preservation report, a certified or consulting arborist shall be in reasonable charge of all activities involving protected trees, including pruning, cabling and any other work if specified. (1) Any public utility installing or maintaining any overhead wires or underground pipes or conduits in the vicinity of a protected tree shall obtain permission from the Director before performing any work, including pruning, which may cause injury to a protected tree. (e.g. cable TV/fiber optic trenching, gas, water, sewer trench, etc.). (2) Pruning for clearance of utility lines and energized conductors shall be performed in compliance with the current version of the American National Standards Institute (ANSI) A300 (Part 1)- Pruning, Section 5.9 Utility Pruning. Using spikes or gaffs when pruning, except where no other alternative is available, is prohibited. No person shall prune, trim, cut off, or perform any work, on a single occasion or cumulatively, over a three-year period, affecting twenty-five percent or more of the crown of any protected tree without first obtaining a permit pursuant to this division except for pollarding of fruitless (7) (3) 20 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture 0 Walter Levison 2017 All Rights Reserved Version: 10118/2017 11)) Walter Levison CONSULTING ARBORIST Mil.1•1011.14 or ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree(gsbcglobal.net mulberry trees (Morus alba) or other species approved by the Town Arborist. Applications for a pruning permit shall include photographs indicating where pruning is proposed. (4) No person shall remove any Heritage tree or large protected tree branch or root through pruning or other method greater than four (4) inches in diameter (12.5" in circumference) without first obtaining a permit pursuant to this division. (Ord. No. 2114, §§ I, II, 8-4-03) 6.0 Tree Replacement Standards - Los Gatos Town Code (Excerpted from Town Code 29.10.0985 and 29.10.0987) (1) Two (2) or more replacement trees, of a species and size designated by the Director, shall be planted on the subject private property. Table 3-1 The Tree Canopy —Replacement Standard shall be used as a basis for this requirement. The person requesting the permit shall pay the cost of purchasing and planting the replacement trees. (2) If a tree or trees cannot be reasonably planted on the subject property, an in -lieu payment in an amount set forth by the Town Council by resolution shall be paid to the Town Tree Replacement Fund to: a. Add or replace trees on public property in the vicinity of the subject property; or b. Add or replace trees or landscaping on other Town property; or c. Support the Town's urban forestry management program. (Ord. No. 2114, §§ I, II, 8-4-03) Table 3-1 - Tree Canopy - Replacement Standard Canopy Size of Removed Tree 1 (Staff is using 24" box size as the Replacement Standard for SFR Projects as of 2016) 2'4 Single Family Residential I Replacement 10 feet or less Two 24 inch box trees 1 Two 15 gallon trees More than 10 feet to 25 feet Three 24 inch box trees Three 15 gallon trees More than 25 feet to 40 feet Four 24 inch box trees; or Two 36 inch box trees Four 15 gallon trees J 21. of 33 Site Address: 110 E. Mein Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Sodety of Consulting Arborista and Member of the International Sodety of Arboriculture ® Walter Levison 2017 All lights Reserved Version: 10/1812017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 1 ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 IstA\1/4 cell (415) 203-0990/ drtree(gsbcglobai.net More than 40 feet to 55 feet Six 24 inch box trees; or Three 36 inch box trees Not Available Greater than 55 feet Ten 24 inch box trees; or Five 36 inch box trees Not Available Notes 1To measure an asymmetrical canopy of a tree, the widest measurement shall be used to determine canopy size. 20ften, it is not possible to replace a single large, older tree with an equivalent tree(s). In this case, the tree may be replaced with a combination of both the Tree Canopy Replacement Standard and in -lieu payment in an amount set forth by Town Council resolution paid to the Town Tree Replacement Fund. 3Single Family Residential Replacement Option is available for developed single family residential lots under 10,000 square feet that are not subject to the Town's Hillside Development Standards and Guidelines. All 15-gallon trees must be planted on -site. Any in -lieu fees for single family residential shall be based on 24" box tree rates as adopted by Town Council. 4Replacement Trees shall be approved by the Town Arborist and shall be of a species suited to the available planting location, proximity to structures, overhead clearances, soil type, compatibility with surrounding canopy and other relevant factors. Replacement with native species shall be strongly encouraged. Replacement requirements in the Hillsides shall comply with the Hillside Development Standards and Guidelines Appendix A and Section 29.10.0987 Special Provisions --Hillsides. Sec. 29.10.0987. Special Provisions —Hillsides The Town of Los Gatos recognizes its hillsides as an important natural resource and sensitive habitat which is also a key component of the Town's identity, character and charm. In order to maintain and encourage restoration of the hillside environment to its natural state, the Town has established the following special provisions for tree removal and replacement in the hillsides: (1) All protected trees located 30 or more feet from the primary residence that are removed shall be replaced with native trees listed in Appendix A Recommended Native Trees for Hillside Areas of the Town of Los Gatos Hillside Development Standards and Guidelines (HDS&G). (2) All protected trees located within 30 feet of the primary residence that are removed shall be replaced as follows: (a) If the removed tree is a native tree listed in Appendix A of the HDS&G, it shall only be replaced with a native tree listed in Appendix A of the HDS&G. (b) If the removed tree is not listed in Appendix A, it may be replaced with a tree listed in Appendix A, or replaced with another species of 22 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture e Walter Levison 2017 All Rights Reserved Version: 10/18/2017 10Walter Levison CONSULTING ARBORIST Atst ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 ; drtree(cllsbcglobal.net tree as approved by the Director. (c) Replacement trees listed in Appendix A may be planted anywhere on the property. (d) Replacement trees not listed in Appendix A may only be planted within 30 feet of the primary residence. (3) Replacement requirements shall comply with the requirements in Table 3-1 Tree Canopy Replacement Standard of this Code. (4) Property owners should be encouraged to retain dead or declining trees where they do not pose a safety or fire hazard, in order to foster wildlife habitat and the natural renewal of the hillside environment. 7.0 Author's Qualifications • Continued education through The American Society of Consulting Arborists, The International Society of Arboriculture (Western Chapter), and various governmental and non -governmental entities. • Contract Town Arborist, Town of Los Gatos, California Community Development Department / Planning Division 2015-present • Tree Risk Assessment Qualified (ISA TRAQ Course Graduate, Palo Alto, California) ▪ Millbrae Community Preservation Commission (Tree Board) 2001-2006 • ASCA Registered Consulting Arborist #401 • ASCA Arboriculture Consulting Academy graduate, class of 2000 • Associate Consulting Arborist Barrie D. Coate and Associates 4/99-8/99 • Contract City Arborist, City of Belmont, California Planning and Community Development Department 5199-present • ISA Certified Arborist #WC-3172 • Peace Corps Soil and Water Conservation Extension Agent Chiangmai Province, Thailand 1991-1993 23 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Lon Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture 0 Walter Levison 2017 All lights Reserved Version: 10/18/2017 lOpWalter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 1 ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 A AKA cell (415) 203-0990 / drtree@sbcglobal.net • B.A. Environmental Studies/Soil and Water Resources UC Santa Cruz, Santa Cruz, California 1990 UCSC Chancellor's Award, 1990 (My full curriculum vitae is available upon request) 8.0 Assumptions and Limiting Conditions Any legal description provided to the consultant/appraiser is assumed to be correct. Any titles and ownership to any property are assumed to be good and marketable. No responsibility is assumed for matters legal in character. Any and all property is appraised and evaluated as through free and clean, under responsible ownership and competent management. It is assumed that any property is not in violation of any applicable codes, ordinance, statutes, or other government regulations. Care has been taken to obtain all information from reliable sources. All data has been verified insofar as possible; however, the consultant/appraiser can neither guarantee nor be responsible for the accuracy of information provided by others. The consultant/appraiser shall not be required to give testimony or to attend court by reason of this report unless subsequent contractual arrangements are made, including payment of an additional fee for such services as described in the fee schedule and contract of engagement. Unless required by law otherwise, the possession of this report or a copy thereof does not imply right of publication or use for any other purpose by any other than the person to whom it is addressed, without the prior expressed written or verbal consent of the consultant/appraiser. Unless required by law otherwise, neither all nor any part of the contents of this report, nor copy thereof, shall be conveyed by anyone, including the client, to the public through advertising, public relations, news, sales, or other media, without the prior expressed conclusions, identity of the consultant/appraiser, or any reference to any professional society or institute or to any initiated designation conferred upon the consultant/appraiser as stated in his qualifications. This report and any values expressed herein represent the opinion of the consultant/appraiser, and the consultant's/appraiser's fee is in no way contingent upon the reporting of a specified value, a stipulated result, the occurrence of a subsequent event, nor upon any finding to be reported. Sketches, drawings, and photographs in this report, being intended for visual aids, are not necessarily to scale and should not be construed as engineering or architectural reports or surveys unless expressed otherwise. The reproduction of any information generated by engineers, architects, or other consultants on any sketches, drawings, or photographs is for the express purpose of coordination and ease of reference only. Inclusion of said information on any drawings or other documents does not constitute a representation by Walter Levison to the sufficiency or accuracy of said information. Unless expressed otherwise: a. information contained in this report covers only those items that were examined and reflects the conditions of those items at the time of inspection; and b. the inspection is limited to visual examination of accessible items without dissection, excavation, probing, or coring. There is no warranty or guarantee, expressed or implied, that problems or deficiencies of the plants or property in question may not arise in the future. Loss or alteration of any part of this report invalidates the entire report. Arborist Disclosure Statement 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 to seek additional advice. 24 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture ® Walter Levison 2017 All Rights Reserved Version: 10118/2017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 AtA .moo . cell (415) 203-0990 I drtree@sbcglobal.net Arborists cannot detect every condition that could possibly lead to the structural failure of a tree. Tree are living organisms that fail in ways we do not fully understand. Conditions are often hidden within trees and below ground. Arborist cannot guarantee that a tree will be healthy or safe under all circumstances, or for a specified period of time. Likewise, remedial t-eatments, like any 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, and other Issues. Arborists cannot take such considerations into account unless complete and accurate information is disclosed to the arborlst. An arborist should then be expected to reasonably rely upon the completeness and accuracy of the information provided. 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 the trees. 9.0 Certification I hereby certify that all the statements of ct in this report are true, complete, and correct to the best of my knowledge and belief, and are made in good faith. Signature of Consultant 10.0 Digital Images WLCA archived images of the survey trees on 10/9/2017: 25 of 33 Site Address: 110 E. Main Skeet (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arbodsts and Member of the I.iLernational Society of Arboriculture 0 Walter Levison 2017 All Rights Reserved Ve-sion: 10/1 B/2017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arbotist #WC-3172 ia1/4 cell (415) 203-09901 drtreer©sbcglobal.net 11.0 Tree Data Table NOTE 1: Fruit and nut trees measuring less than 18" diameter (total of all mainstems) both on the site and excluded from this study as "exemption trees" per the Town tree ordinance. NOTE 2: Tree preservation suitability ratings (TPS) are determined independently from and irrespective of work. on adjacent neighbor properties were current proposed site construction Tree Tag Number & Species Common Name Trunkl Diameter Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Height & Canopy Spread (Ft.) Health & Structural Rating • (100% Each) Overall CondRatlinion tGenus g (0 to 100%)1 a IIc g Illy I Lopsided Canopy (note direction) Trunk Lean (note direction ) 2 cc Root Flares Buried in Fill Soil Pests and Disease Presence, and Other Notes SUGGESTED ROOT PROTECTION FENCE RADIUS rc� MAINTENANCE AND PROTECTION CODES 21 Sequoia sempervireas Coast redwood 57.6 - 57.6 125135 80175 78% Good X Mod to Good These redwoods are likely experiencing soil moisture deficit (aka "drought stress"). Irrigation application will need to remain active during the proposed site plan work period. Per CTA tree map markup. W, TB, RPZ Heavy irrigate 2)clweek 50 to 100 gallons per watering day. No expected impacts from proposed work. 22 Sequoia sempervlrens Coast redwood 28.7 — — 28.7 95118 80165 70% Good X Mod to Good Does not appear to be affected by proposed work. Per CTA tree map markup. (All same as tree #21) 23 Sequoia sempervlreas Coast redwood 43.5 — — 43.5 120130 85185 85% Good X Mod to Good Does not appear to be affected by proposed work, except possibly the electrical conduit trench near the proposed pathway. Per CTA tree map markup. TB, RPZ, W, and adjust conduit locations andlor reduce conduit depth of cover. 26 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture © Walter Levison 2017 All Rights Reserved Version: 10H 812017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 ®A cell (415) 203-09901 drtree@sboglobal.net sbcglobal.net Tree Tag Number Genus & Common Name Trunkl Diameter 1 j Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Height & Canopy en Spread (Ft.) o a 4tong e GI 0 Overall Condition lot, II Lopsided Canopy (note direction) • Trunk Lean (note direction ) o = in a e_ esSpecies m z SUGGESTED 3'�° ROOT 2 PROTECTION a a D FENCE RADIUS 7e•s V. o_ 3 m ° MAINTENANCE TENANCEmVe aMo4m?o AND'2 $V A3 �3a e c0wa PROTECTIONa=m3 e 1 n g � " CODES Sequoia sempervirens Coast redwoodGood 75160 63% Fair X Mod to Potentially very significant impacts to root system from trenching and excavation related to the proposed electrical conduit work, walkway base prep, and landscape Irrigation pipe trenching (not specified), and landscape plant pit digging. 25 Sequoia sempervlrens Coast redwood 43.9 — -- 43.9 110130 70170 70% Good X Mod to Good Potential very significant Impacts related to trenching and excavation for proposed electrical, walkway base sections, irrigation piping, and landscape plant pit digging. Per CTA tree map markup. TB, RPZ, W, and adjust all proposed work noted at left to minimize root system disturbance. 27 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arboists and Member of the International Society of Arboriculture SS Walter Levison 2017 All Rights Reserved Version: 10118/2017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified I ISA Certified Arborist #WC-3172 A� cell (415) 203-09901 drtree©sbcglobal.net Tree Tag Number Genus & Species Common Name Trunkl Diameter Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Haight & Canopy Spread (Ft.) Health & Structural Rating (100% Each) Overall Rating (0 to 100%) r= a 1 x 0c Lopsided Canopy (note direction) Trunk Lean (note direction ) 2Condition rg rs " 5 Root Flares Buried in Fill Soil Pests and Disease Presence, and Other Notes SUGGESTED I ROOT PROTECTION FENCE RADIUS tr. MAINTENANCE AND PROTECTION CODES 26 Sequofadendrvn t�+9ameum Giant sequoia 57.7 - - 57.7 135130 45145 45% Poor ? 7 Poor South Tree affected by Botrysphaeria fungus Infection, which will cause a continued decline for many years (no cure). Tree may have 5 to 10 years of life left as a useful landscapeelectrical element. Twig dieback andfoliar decline noted throughout canopy. Suggest removal of tree at this time. Tree will be negatively affected by proposed electrical conduit trenching as currently proposed. Per CTA tree map markup. Iff retain tree, then TB, RPZ, W, and adjust location of proposed conduit to at least 15 or 20 feet offset from trunk edge (or set electrical over -grade In heavy duty steel conduit tubing). 28 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consultlng Arborists and Member of the International Society of Arboriculture ® Walter Levison 2017 All Rights Reserved Version: 10118/2017 i))) Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified 1 ISA Certified Arborist #WC-3172 cell (415) 203-09901 drtree@sbcglobaInet Tree Tag Number Genus & Species Common Name Trunkl Diameter Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Height & Canopy Spread (Ft.) Health & Structural Rating (100% Each) Overall Condition RaOng (0 to 100%) = T. " Lopsided Canopy (note direction) Trunk Lean (note direction ) Root Flares Buried in Fill Sod Pests and Disease Presence, and Other Notes SUGGESTED ROOT PROTECTION FENCE RADIUS re• � MAINTENANCE AND PROTECTION CODES Sequoia serrrpervlrens Coast redwood 21.2 — — 21.2 90116 70170 70%Gd Goo X Mod to Good Current proposed electrical conduit trench route may destroy 40 to 50% of the tree's root system. Per CTA tree map markup. TB, RPZ, W, and relocate proposed conduit to at (east 15 or 20 feet offset from trunk (or place over - grade in heavy duty steel tubing). TB, RPZ, and relocate proposed electrical conduit trench further west than currently proposed. 28 Quercus agrifolla Coast live oak 18.4 — — 18.4 50f30 8S/70 77% Good X Mod to Good South South Normal buttress root flares (good). Tree lean and severe lopsidedness to the south. No Impacts expected from proposed work, except possibly from electrical conduit trenching. Per CTA t tree rap markup. 29 Sequoia sempervfrees Coast redwood 65.2 — — 65.2 140145 75f65 68% Fair Mod to Good Twig density moderate in louver elevation areas, and poor to mod In upper elevation areas. Tree Is sensitive to any changes In soil moisture. Per CTA markup. TB, RPZ, and maintain heavy Irrigation of the entire root zone throughout the turf and open sell areas to be fenced off. Do not excavate deeper than the existing walkway bassrock bottom elevation. 29 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arbodsts and Member of the International Society of ArbaricWture ® Walter Levison 2017 All lights Reserved Version: 10118/2017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-09901 drtreetksbeglobal.net Tree Tag Number I Genus & Species Common Name Trunkl Diameter Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Height & Canopy Spread (Ft.) Health & Structural Rating (100% Each) Overall Condition Rating (0 to 100%) 1 h True ri ry llj+l RaiiIng%alga Lopsided Canopy (note direction) Trunk Lean (note direction ) Girdling Roots Root Flares Buried in Fill Soil Pests and Disease Presence, and Other Notes SUGGESTED ROOT PROTECTION FENCE RADIUS 1c� t MAINTENANCE AND PROTECTION CODES 30 Sequoia sempervlrens Coast redwood 25.1 — — 25.1 95130 75165 70% Good X Mod to Good An existing concrete walkway is located Just a few linear feet north of the trunk edge, which means proposed new work will have minimal additional negative effect on the root system. Per CTA tree map markup. TB, RPZ, W, and keep all new walkway base excavation cut depths to no deeper than the bottom of the existing walkway base rock layer, 30of33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture i Walter Levison 2017 All Rights Reserved Version: 1o11812017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #4011 ISA Tree Risk Assessment Qualified 1 ISA Certified Arborist #WC-3172 AgA\A. cell (415) 203-09901 ddree@sbcglobal.net Tree Preservation Suitability (TPS) Ratings Based Solely on Each Tree's Merits: (Not Associated With Proposed Site Plan Construction -Related Work) TPS Rating Definition VG Exceptional current season's live twig density and twig extension ("TDE"). Tree provides multiple benefits to the property and users of site (e.g. shade, wildlife, patriarch tree, key landscape element or specimen in front yard, etc.). Trees with a minimum overall condition rating of 85% out of 100% points possible as determined by the City Arborist. Tree structure vertically -oriented with little or no lopsidedness or other architectural defects. Species with long life expectancy, andlor good resistance to most pests and diseases. Tree in a position that Is correct for its sunlshadeldrainage needs. Tree not damaged by Incorrect pruning. Redesign of applicant's proposed site work is warranted at any cost to preserve the root system and the above -ground portion of the tree. Good TDE, with a 70% or better overall condition rating as determined by the City Arborist. Tree may be lopsided or leaning, but provides good benefit(s) to the property and users of the property (e.g. shade, wildlife, sight -line screening, etc.). Species with long life expectancy andlor good resistance to most pests and diseases. Tree located in a position that is correct In terms of Its sunlshadeldrainage needs. Tree may or may not have been correctly pruned In the past. Applicant's project team should seriously consider site plan redesign to work around the tree's root system and above -ground canopy. M Moderate Moderate TDE. Tree may be significantly damaged by past pruning. Tree may exhibit pest and disease issues that are not curable through current known treatments. Tree may exhibit non -correctable structural issues. Species may be relatively short-lived or have a limited remaining useful life expectancy. Placement of tree may be incorrect in terms of high voltage power line conflicts, slow drainage, sun/shade requirements, etc. Consider allowing the applicant to remove the tree to achieve proposed site work goals. P Poor Tree has potentially serious structural andlor health issues that are not correctable through current known treatments (e.g. a very large diameter girdling root, a serious bark inclusion at a large diameter mainstem fork that is prone to catastrophic splitout, etc.). Tree may be growing vertically up into high voltage electric wires. Tree may be a species that is undesirable in terms of its low relative wood strength, short lifespan (e.g. a colonizing species such as white alder), etc. Tree may be at the end of its expected lifespan, and Is in a spiral of decline. Tree root system may be in conflict with existing buildings, Infrastructure, etc. Staff is encouraged to allow applicant to remove tree to achieve site plan work goals (though the tree may still be useful as a property boundary wildlife tree for raptors, songbirds, raccoons, foxes, etc.). VP V - Roughly 0% to 20% overall condition rating. Tree in active declining stage with no possibility of recovery in terms of health (vigor) or structure. Tree may have a visible high risk of tree part failure and impact with life andlor property. Tree has little remaining useful lifespan. Removal of tree is encouraged as needed to achieve site plan work goals. Tree may still have some use as a sight -line screen andlor wildlife element If retained near the property boundary or far from residential structures and roadways. 31 of 33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture ® Wafter Levison 2017 Al Rights Reserved Version: 10/18/2017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 ,AxA\ cell (415) 203-0990 / dltree@sboglobal.net Tree Maintenance and Protection Codes Used in Data Table: RPZ: Root protection zone fence, chain link, with 2" diameter iron posts driven 24" into the ground, 6 to 8 feet on center max. spacing. Alternative material: chain link fence panels set over concrete block -type footings, with the fence panels wired to steel pins pounded 24 inches into the ground at both ends of each panel. RB: Root buffer consisting of wood chip mulch lain over existing soil as a 12 inch thick layer, overlain with 1 inch or greater plywood strapped together with metal plates. This root buffer or soil buffer should be placed over the entire width of the construction corridor between tree trunks and construction. RP: Root pruning. Prune woody roots measuring greater than or equal to 1 inch diameter by carefully back -digging into the soil around each root using small hand tools until an area is reached where the root is undamaged. Cleanly cut through the root at right angle to the root growth direction, using professional grade pruning equipment and/or a Sawzall with wood pruning blade. Backfill around the cut root immediately (same day), and thoroughly irrigate the area to saturate the uppermost 24 inches of the soil profile. BDRP: Back -dig root pruning: Hand -dig around the broken root, digging horizontally into the open soil root zone until a clean, unbroken, unshattered section of the root is visible. Proceed as per 'root pruning'. RCX: Root crown excavation. Retain an experienced ISA-Certified arborist to perform careful hand -digging using small trowels or other dull digging tools to uncover currently -buried buttress root flares. Digging shall occur between trunk edge and at least two (2) feet horizontal from trunk edge. The final soil elevation will be at a level such that the tree's buttress roots visibly flare out from the vertical trunk. TB: Trunk buffer consists of 20-40 wraps of orange plastic snow fencing to create a 2 inch thick buffer over the lowest 8 feet of tree trunk (usually takes at least an entire roll of orange fencing per each tree). Lay 2X4 wood boards vertically, side by side, around the entire circumference of the trunk. Secure buffer using duct tape (not wires). F: Fertilization with slow -release Greenbelt 22-14-14 tree formula, as a soil injection application using a fertilizer injection gun. This brand and formulation is commonly used by reputable tree care companies in the Bay Area. Apply at label rate and injection hole spacing. M: 4-inch thick layer of chipper truck type natural wood chips (example source: Lyngso Garden Supply, self pick-up). Do not use bark chips or shredded redwood bark. W: Irrigate using various methods to be determined through discussion with General Contractor. Irrigation frequency and duration to be determined through discussion and/or per directions in this report. Native oak species typically require lxlmonth irrigation, while other tree species tend to prefer 2x/month or 4x/month moderate to heavy irrigation during construction. P: Pruning per specifications noted elsewhere. All pruning must be performed only under direct site supervision of an ISA Certified Arborist, or performed directly by an ISA Certified Arborist, and shall conform to all current ANSI A300 standards. MON: A Project Arborist must be present to monitor specific work as noted for each tree. 32 of 33 Site Address: 110 E. Mein Street (Veterans' Memorial) Los Gatos, CA Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture ® Walter Levison 2017 All Rights Reserved Version: 1011812017 Walter Levison CONSULTING ARBORIST ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 ? drtree@sbcglobal.net 12.0 Attached: Tree Location & Protection Fence Map Mark-up The CTA marked up the applicant's tree protection and removal sheet version "August 2017" by Westfall Engineers, INc. of Saratoga, CA. The CTA added four (4) different items to the sheet for reference purposes: a. The red=dahed Ig indicate the CIA's suggested chain link root protection fence alignment (initial rough), based on available open soil root zone areas that are protectable (assuming the scope of site plan work will occur as currently proposed). b. (Clouding in black lines indicates an important note regarding use of heavy irrigation for all of the redwood specimens during the project construction period. c. The mager'ta zone indicates an existing sidewalk that was not noted on the sheet. Added for reference purposes. d. The yellow zone indicates the current proposed electrical lighting conduit trench routes per sheet El "electrical and lighting site plan" 33of33 Site Address: 110 E. Main Street (Veterans' Memorial) Los Gatos, CA Version: 10/18/2017 Registered Member, American Society of Consulting Arborists and Member of the .ntemational Society of Arboriculture ® Walter Levison 2017 All Rights Reserved This Page Intentionally Left Blank