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Home My WebLink AboutSS4 - Marine Ave Tree Maintenance - PowerPointIan U1 I_, roster August 13, 2019 Item No. SS4 City Council Study Session August 13, 2019 on Marine Avenue Tree Trimming & Maintenance Overview Public Works Department Municipal Operation Division Some Background Leading to this Discussion In 2015, some members of the Balboa Island Community and their Association's including the Balboa Island Improvement Association, Little Island Association and Marine Avenue Merchants Association began discussions with regard to the potential rehabilitation of Marine Avenue Former City Councilmember Ed Selich requested, and City Council approved $250,000 in funding within the FY 16-17 Capital Improvement Program budget for Development of Concepts Plans, and possibly eventual design The Island Community then set up a Marine Avenue Committee that included a wide Cross Section of folks City staff attended meetings as well as arranged for needed Design Consulting Services to assist the Committee with development of Concepts Plans to be reviewed and discussed with the Island Community Some Background Leading to this Discussion City Staff advised the committee early on that many of the trees were in declining health, and/or would have stability, root damage and accelerated health decline if all the existing supporting concrete was removed Objective was to develop an Island -Wide Consensus on a Preferred Marine Ave Conceptual Design that would then be presented to the City Council for review and approval The Marine Avenue Committee held several meetings (open to the public) to discuss and develop Concept Plans. The Committee held two Open Houses (May, 9 2018 & June 9, 2019) at the Island Fire Station to solicit Community Options and Comments on Draft Concepts During these Open Houses, discussions regarding the Disposition of the Current Street Trees began to arise Some Background Leading to this Discussion Around January 2019, an independent mailer was distributed to Residents requesting that they review and vote on revitalizing Marine Avenue in a "Quaint Historical" or a "Classic Contemporary" style. With this survey and results arose an organization known as the "Balboa Island Preservation Association" or BIPA which advocated that any redevelopment of Marine Ave should maintain the Quaint Historical look & feel, and that the existing Eucalyptus trees needed to be maintained in place Around March 2019, the Committee and City staff were advised that an independent Arborist Review and Report of the Marine Avenue Street Trees had been prepared by the Balboa Island Preservation Association This was followed by further criticism by the BIPA and Mr. Applegate of the City's Annual Marine Avenue Tree Inspection/Trimmed conducted by the City's Contractor Great Scott on March 11th and 12th Some Background Leading to this Discussion As of this date, no further direction has taken place with regard to further development of a revitalization project concept plan for Marine Avenue Some of the Confusion folks are having is that: There is a potential Project being discussed that could effect the existing trees. That Conversation has not been completed nor finalized And there is the on-going Maintenance of the Existing Trees that will require the removal and replacement of some trees Contrary to some statements - the City is not intentionally overly maintaining or removing the existing Eucalyptus Trees on Marine Ave to make way for, or to support the potential project For more General Overall Information on the City's Tree Management & Maintenance Program — Please view the February 12, 2019 City Council Meeting — Item SS3 — "Overview of City Trees" Background on Marine Ave Trees Eucalyptus trees first appear in 1920's on the 200 Block of Marine Avenue Eucalyptus species appears to be mainly "Flooded Gum" (Eucalyptus rudis) Today, there are 42 Trees on Marine Avenue composed of five types of Eucalyptus and Corymbia species. predominate species "Lemon -Scented Gum" is the Background on Marine Ave Trees The Eucalyptus on Marine Ave. were adopted as Special Neighborhood trees in City Council Policy on November 28, 1988 The Trees appear to have been topped prior to the City's adoption of International Society of Arboriculture (ISA) standards, up through the early 1980's Prior to 1993, City crews did not have capacity to trim over 55 -feet In 1994, first tree maintenance contractor, West Coast Arborists, attempted corrective and structural pruning Council Policy G-1 The City Classifies Public Trees in one of Three Categories: Special Trees (Landmark, Dedicated or Neighborhood Trees) Problem Trees All Other Trees It is the City's policy to retain City trees categorized as Special Trees (Neighborhood Trees) that by their unusual size, number, species, or location lend o special character to o residential, commercial, or business area Special Trees shall be retained, unless there are overriding problems, such as death, disease, or the creation of a hazardous situation, which require their removal Council Policy G-1 Prior to consideration for any removal of a Special Tree, Staff shall prepare a report identifying and implementing specific treatment to retain the tree. If specific treatment is unsuccessful or impractical in retaining a tree, then a full staff report shall be made to the Parks Beaches and Recreation [PB&R] Commission. Specific Past and on-going Treatments Minor root pruning and shaving to accommodate hardscape repairs. Deferred hardscape maintenance Ramping with asphalt patches. Repeated grinding of lifting sidewalks Removal and resetting of hardscape (curb, sidewalks pavements) Annual inspection and trimming Reviews by Consulting Arborists Treatments of diseases and insects (Lerp Psyllid and Tortoise Beetle) Supplemental irrigation and nutrition via water truck Site Conditions Very Crowded Pedestrian Sidewalks and Street Parking underneath Trees on Marine Ave (busy business, tourist area) Small Tree Wells, surrounded by concrete in various states (restricts air/water/nutrients to roots) No Supplemental Irrigation Shallow Available Root Growth Area due to High Salt Water Table Years of Tree Root Crowns covered by Decomposed Granite, then more recently Artificial Turf (installed by BIIA). Canopies in Close Proximity to Buildings / Roofs and Signage Maintenance History For the past 25 years, the City has Inspected and Trimmed all Marine Ave Trees Annually This occurs over multiple days in the early morning, so as to minimize disruption to businesses - last service on 3/11/19- 3/12/19) Over the past 25 years, the City has Removed and Replaced approximately 30% (20-25) of the Eucalyptus Trees. In May 2017, based on Risk Assessments Review, PB&R approved the removal of two Special Eucalyptus Trees (at 318 and 326 Marine) The City Responds annually to Large Limb Breakages, typically during Storm Events and Santa Ana Winds. Prior Replacements were composed of Lemon -Scented Gums & Water Gums Eucalyptus Trees, and more recently African Tulip & Gingko trees. Considering the location, older trees are reaching the end of their typical lifespan (50-60 years) Dctober Za Eucalyptus in Similar Condition in other - `aw Cities Laguna Beach Broadway Street High Pedestrian, Parking and Vehicle Traffic Similar Conservative 4q Trimming i* % -%W A%K- %011 It I iimilar Condition in Cities Laguna Beach Broadway Street High Pedestrian, Parking and Vehicle Traffic Similar Conservative Trimming other Eucalyptus in Similar Condition in other Cities Mission Viejo Alicia Parkway Narrow Median High Volume Travel Lanes Similar Conservative Trimming Consulting Arborist Reports Arborgate Consulting Report Author -Greg Applegate, Consulting Arborist Requested and funded by Jodi Bole & Balboa Island Preservation Association Report designated as a "Tree Protection" Report Summary Comments on current and future tree maintenance Concerned with Lions -Tailing, structural pruning, and other pruning concerns Concerned about artificial turf and buried root crowns Recommendations on protection of trees during construction and repairs Suggests no root pruning 3 to 5 times the diameter of the tree Included Tree health and condition matrix Recommendations include Three Eucalyptus Tree Removals Recommends a Hazard Analysis by a Tree Risk Professional versed in Risk Analysis Walt Warriner Consulting Report Author -Walt Warriner, Consulting Arborist Contracted by the City of Newport Beach Conducted a Tree Risk Assessment and Provided Recommendations Risk Assessment Procedure: Timeframe applied Site factors assessed — "Tree stability is separate from Tree Health" Crown considerations: live crown ratio, crown symmetry, and branching issues (lions -tailing) Root conditions and trunk issues Potential Targets Risk Categorization Walt Warriner Consulting Report Continued Likelihood of Failure of a Specific Tree Part is compared with Likelihood of the Specific Tree Part Impacting an Object of Concern The result of the above analysis is then compared to the Consequences of Failure Most Consequences for Marine Avenue were Rated at Severe The Overall Risk Rating was deemed High for 27 trees and Moderate for 10 trees The Consultant Recommends Removal of all 27 trees with a high risk rating and Reassessment in one year of trees with moderate risk C Sample ISA Tree Risk Assessment Form Basic Tree Risk Assessment Form Ff]dre55i iIPP IOCd Or. 11 �ctitrl ye r� Trrr n[,' Im SheEi q- Tra-r.r��r. cr..-`?P 5 CcwxFt"i�fLi4i5i S•L�� .. :owr:Lrnad dig. -Sia-L%r Ass[;sor±s: .. v�w� Tnnln n: -d nrce frame Tareat Acv+ccrnaM nrulmno ` r $z FF -1 p ;:€ 1aj C•J �..•, P 4+ {3t Ll Hlstoryoffallures_ 1r'i0' Ic�:.V'��Pa�rPrM1'Fla[L11�cu SiLecha7'4a Nom_❑Gr3Ea Lla',ILr]Si:Gcicarirg❑CMf�Oso lhy:ir9�p• H"nrc:.tz g3's(-::rihc S: c;C_. �'T_,j' So4uandldw'6 limil[Mr. in,lnmf3firur..2d❑ 5FAImC Cxn-a..ed Q'j 4F'rnrN anrr,ims� % auL ire �1 vrp,aYling wlnd dirr.� .`�'x�Cornmon weadaef 5(1 org,•And5 _1 .tinrwO Inzr. rain L] CesviLe <r •t Imo- {K-R<•�ti _ i'„u,� W7 H9.Ith arid$pedes Profile vigor l:ra•❑ h.c nut Hlhip Foliage Nab{ua "I..0Nnq�'[de r�f7 rlx:ra.dm, Chlan]tl[..-t W.,.Hc'Z, Festsfalotic .4�: py]• f!!'7 JIV�L4 f�j—�Tti�f �p AfG��mF^ Spuciusf ilurcpfarde @'�,[I es l'T'u I1fC HGM!YYl.so-r nr• �'•'S r-r'�'' `.s'F"'f/ L09 FBLN Y5 Wind rapo>ure Pro[e::e]7 tarda alit tLi,d Tn,nrli,g 4lnr't'P-✓.1 S i� {va uDym E1�, S-11 LJ M2,i-rn❑ z1,e Lrawnd-ily SPd SE❑ RCIm2E'JVDCr6cCJ nlc�for branches frxC Yorrnn n'e'• Nnrx/MisrcmrfMoesL Re a ecmd chE MMM trete[- Tree Defects and Conditions Alfacdmw Shv kclil-d pf � w.F�ni'k- Y- 1-1 .. 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D.. blfiroi LJPr_i y,�fyjr�y'f'.'4duancea a35055mane n 9 dea:11u C}tirTppeif ..xanr yy,,.� _ Inaoendon iimihrtiore LRiJhnr rv•iisinl11-y IA-n:I-Ltr-tco.3r L,llfie ]-auiL• iJ-uy-'N R—•� - nn-,r,drrx.n Mvr.a lr:Irr�m•r.�r.ai£, ra- ... �i.i.d,I 1"[. !Sm l xr] City Arborist Review & Recommendations Continue Annual Inspections and Pruning with Emphasis in Crown Restoration (where possible). Concur that 27 trees are in the High -Risk Category due to Risk of Whole Tree or Large Limb Failure. Based on a Triage System, and as an Urban Forestry Management Principle: Remove 10 High -Risk Eucalyptus Trees this year (2019/20). The Trees Identified have Significant Defects in the Canopy, the Root System & Trunk. Possibly Remove up to 17 (or more) High -Risk Eucalyptus Trees in the Following Two / Three Years, per Re -Assessment. These Trees Primarily have Significant Defects in the Canopy Only, which would relate to a Large Limb Failure (still severe) vs. a Whole Tree Failure (more severe) per the above trees. Summary of Recommendations Based on Re -Assessment Arborgate WaltWarriner City Arborist Report Report Review Maintenance Yes Yes Yes Review Risk Assessment No Yes Partial Included Eucalyptus Year I = 10 Removals 3 27+ Recommended SubsequentYears = 17+ Based on Re -Assessment +� Y " -"Q ONYX AYES noO �.J �' Nr.• N N N `N N or n I N� moi`"- N _sp, m• . � • Gyym� � M M- M � � "? , �� N N .. n W., TREE ACTION PLAN ■ � gyp' F LOW to MODERATE RISK r I .-- M Fd'^ N� 4 p .� :rte. 0•� - �8 N N N � �. y RISK/MONITORINGHIGH t 1 ti.rAMETHYSTiAVE� ' yHIGH RISK/PROPO �` 4•F M m Xi VACANT _ . ._aarl gnu • !, o- ` : t — i-rj _1:1_!1 �Si I-AI%M M&j d>�IJ--- 49L 'be ry'7 N r3 '0 334' O N AK LEI"�L DR"'. BoSDABALONE C V054 �, �� ' �' (.� [+} �f M d V �� O ' m � M�b N d � N W cp• � O � tO N rD G R A N D C A N A L _ GRAND.C' N ar _AN'AL• 1co rN M �-� Vc*Y I c1T @� $MARINE 4NE• ` ■ s a . Ai ", - ,:.� Z� V .. LUJ a +� Y " -"Q ONYX AYES noO �.J �' Nr.• N N N `N N or n I N� moi`"- N _sp, m• . � • Gyym� � M M- M � � "? , �� N N .. n W., TREE ACTION PLAN ■ � gyp' F LOW to MODERATE RISK r I .-- M Fd'^ N� 4 p .� :rte. 0•� - �8 N N N � �. y RISK/MONITORINGHIGH t 1 ti.rAMETHYSTiAVE� ' yHIGH RISK/PROPO �` 4•F M m Xi VACANT _ . ._aarl gnu • !, o- ` : t — i-rj _1:1_!1 �Si I-AI%M M&j d>�IJ--- r3 '0 334' O N N +� Y " -"Q ONYX AYES noO �.J �' Nr.• N N N `N N or n I N� moi`"- N _sp, m• . � • Gyym� � M M- M � � "? , �� N N .. n W., TREE ACTION PLAN ■ � gyp' F LOW to MODERATE RISK r I .-- M Fd'^ N� 4 p .� :rte. 0•� - �8 N N N � �. y RISK/MONITORINGHIGH t 1 ti.rAMETHYSTiAVE� ' yHIGH RISK/PROPO �` 4•F M m Xi VACANT _ . ._aarl gnu • !, o- ` : t — i-rj _1:1_!1 �Si I-AI%M M&j d>�IJ--- Overview of Tree Evaluation (10 High -Risk Trees) Common Terms and Meaning Asymmetrical - having parts or aspects that are not equal or equivalent; unequal in some respect Co -Dominant Limbs - two or more branches with the same diameter and height that have grown from the same point of origin Dieback - a condition in which a tree begins to die from the tip of its leaves or roots inward, owing to disease or an unfavorable environment Contact Growth - when tree roots or trunks grow over or around an object it has come in contact with Heartwood Decay - caused by a fungus that deteriorates the inner wood of a tree (naturally occurring tree process) Deadwood - Dead branches on a tree Live Crown Ratio - ratio of crown height to total tree height, (percentage of a tree's total height that has foliage); indicator of tree vigor Root Plate - part of the root system (excluding the small, outermost roots) needed to keep a tree "windfirm". 210 Marine Ave. Asymmetrical Co -Dominant Limbs Dieback Contact Growth Suspected Heartwood Decay - %ILY IS I r� A „i 4 16 it A f :f x 1� SPOU VAMI Lq 312 Marine Ave. Asymmetrical Poor Overall Health Significant Leaning Trunk Suspected Heartwood Decay Root Pruning for Sidewalk Work 11, ?'uR, 319 Marine Ave. Asymmetrical 15% Live Crown Ratio Significant Leaning Trunk Root Pruned / Decayed Heaving Sidewalk ' illll IIIIIItlIII111111N111111111111 TOr 315 Marine Ave. Dead Tree High -Risk, Necessitates Imminent Removal Staff has scheduled removal for this Fall PB&R notified at August meeting w `X 4t i MIA, E 4V dE 'oil Arm I A- Current Vacant Tree Sites Total of 5 Vacant Tree Well locations currently 207 Marine Ave Y� 302 Marine Ave 301 Marine Ave Proposed Path Forward Regarding Marine Avenue Tree Maintenance Remove Current Dead Tree at 315 Marine just after Labor Day. The Parks, Beaches and Recreation Commission was advised and confirmed this action at their August Meeting Provide Report and Recommend Removal of the other 9 High Risk Trees discussed above to the Parks, Beaches and Recreation Commission in September. Upon their Concurrence, Schedule and Remove these trees Make any Necessary Hardscape Repairs Around existing Tree Wells where trees were removed such as uplifted and/or broken sidewalk or curb Replant all 15 Tree Wells with 24" Box Eucalyptus (5 currently vacant and 10 from removals) Arrange for on-going Watering of new Trees by Water Truck or Merchant Volunteer Continue with Annual Inspection and Trimming of All Marine Ave Trees Examples of 24" Box Eucalyptus Ll I 1 4 „ Eucalyptus trees are Rapid Growers with approximately 60 percent of their growth established within the first 10 years /off �,ro \ Comments/Questions Your Public Works Department Protecting and Providing Quality Public Improvements and Services