健康樹木可持續(xù)發(fā)展性IntroductionAboutTCOTAboutmeAboutHealthyTreesAboutyouInfrastructureRenovationsfor23rdStreetMedianCrystalCity,VASessionOverviewWheredoHealthTreesbegin?GettingtotheRootoftheProblemDesignforSustainabilityNewTechniquesforSuccessinHealthyTreesQ&A“Ifsomedaywearetoknoweverythingthereistoknowabouttheabovegroundportionofthetree,wewillstillonlyknow…”

Dr.AlexShigoUSForestService“…h(huán)alfthestory!”HealthyTreesstartwithHealthyRoots-“MythBusters”Dotreeroots

reallyextendonly

tothedrip-lines?Whatabouttaproots,mirrorimages,&formulas…?“FirstAnnualNationalCapitolRootAppreciationDay”RockSpringPark,Bethesda,MD-November199215”HoneyLocust:rootradius=34feetAnotherrootmythdebunkedMythBusters4thAnnualNationalCapitolRootAppreciationDayManassasParkHighSchoolManassas,VA

Whydidweneednewmethods?

Howdowefindthem?

AndwhatdidtheCEOnotaskfor…?BaltimoreLifeHomeOffice,OwingsMills,MD1992and2008HealthyTreesinconstructioncomefromteamworkandbeginattheDesignTable

WhodoyouinvitetoyourTable?SustainableDesignvsDesignAfterthoughtsSupersonicAir-ToolsGeo-compositesforHealthyRootHealthySoilBiologyUSSenateParkPerimeterSecurityConceptualDesign/BuildTeamHowdoweusetreesasDesignElements?Oraretheymere“Afterthoughts”?Ifthetreesareadesignelement,notanafter-thought,thenyouhaveSustainableinyourDesign.5yearslater…“AreweSustainableyet?”“Wherearetheroots?”

Mach2SupersonicAir-tool(SSAT)forRootInvestigationQuestionfortheprofessors:“HowfastisMACH2?”RootInvestigationforSenateParkPerimeterSecurityDesignDocumentfindingsandpreparerecommendationsfordesignmodification.NorthernRedOak“Kwanza”FloweringCherryProposedUSCapitolSecurityBollards

Assessimpactanddeterminealternatedesign&constructionproceduresRootInvestigativeStudyReport

Objectives:DeterminegrowthcharacteristicsofrepresentativetreespeciesinLoudounCounty,VAbymeansofinvestigativedigginginrepresentativespecies,soilsandhydrologicalregime.TheresultsofthisStudyareusedtodeterminestrategiesindesignandconstructionaswellasprescribeappropriateprotectionmeasures&stressreductiontherapies.

BeginningSupersonicAirtool(SSAT)Investigationwithinproposedroadwayselectingrepresentativetreespecies:

WhiteOak,RedOak,Hickory,Ash.

Noterootsareverynearsurface.ThisisnotcharacteristicofwhiteoaksinMontgomeryCountyMDPiedmontinloamyclaymicarichsoils.Deeperrestrictivelayersareassumedtobethereason.Refertosoilsboringreportsforverification.TechnicalFindings23”WHITEOAK(whitepaintforphoto)TOTALROOTLENGTH(est.)=50’DIAM.ATDIST.FROMTRUNK3”@10’1”@20’.5-.75”@30’.25-.5”@40’ENDATEST50’ConceptDesignforProposedCorporateFinancialCenterNationalRuralUtilities,DullesTownCenter,VASeverallocationsatthePennsylvaniaStateCapitolSouthParkwereidentifiedwithtreeswhicharehavingpotentialdesignelementsinstalledorrenovatedwithintheirCriticalRootZones(CRZs)withpotentialformajorimpacts.Thesedesignelementsarestormdrainpipeandinfiltrationbeds,concretesteps,electricsitelightconduits,retainingwalls,waterlines,andwalkdemolitionandreconstruction.

RenovationstoPennsylvaniaStateCapitolSouthParkLandscapeConstructionSuperintendentdocumentingsignificantrootdepthandlocationfordesignofgradebeam.RenovationsofprivateresidenceinPhiladelphia,PAUtilizeSSATforloweringgradewithinCRZsfornewsidewalkRootInvestigationduringdemolitiontodetermineneedforspecialdesignmodificationsforretaining38”Quercusphellos.IndependenceAvenueStreetscapeRenovationatthe

USCapitolHouseOfficeBuildingaka“LongworthOak”5yearslater….WorkinginsidethecriticalrootzonewithSSATInserting$3,000lightpolebasebetween2matureQuercusphellosatthehistoricHomewoodHouseJohnsHopkinsUniversityHomewoodCampusBaltimore,MDLandscapeRenovationsDesign/BuildSprinklerandlowvoltageelectricalcableinstallation“Butweareonlydigginglessthanafootdeep!”Architects:Crossout“Shallbehandexcavated”inyourMasterSpec!RootPruningwithSSAT/HandToolsforroots>1.5”diameterorwithininner?ofCRZradius.MethodofRootPruningtobedetermined….PerimeterSecurityforLafayettePark,PennsylvaniaAve&15thStreet,Wash.DC“SmithsonianLevel”RootPruning

attheHauptGarden,WashingtonDC

UtilizingtheSuperSonicShopVac(SSSV)Problem:SustainingHealthyTreesonaCampusorCommercialSitewithpoorsoilsorpedestriancompactionovertime.Nativehealthytopsoils=80%compaction;Urbansiteseasily90%-98%.Howcanyou“decompact”soilswithoutrootdamage?SSATtotherescue!RadialMulchingwithSSATto“De-compact”SoilsBackfillwith50%OrganicCompostExcellenttimeforCompost Teas/HumatesStandBack!ShadyGroveAdventistHospitalRenovations,Gaithersburg,MDSubsurfacebasal

decaycanbeverified

aswellas“Girdlingroot”

investigationcanbe

doneatsametimeSustainingtreesingradefillsinsitedesign48”DBHHickory

WheretoputPhaseIto

PhaseIIconnectingdrive?T.RowePriceFinancialCenterOwingsMills,MD1995GradefillsproposedwithintheCRZrequirespecialdesignmodificationandspecialconstructionprocedures“Rootfriendly”pavementsectionemployingthelatestingroundengagingtechnologiesSustainingTreesingradefillsinsitedesignButdoesitwork?10yearslater…“AreweSustainableyet?”RootAerationSystemsfrom1983-1993BaltimoreLifeInsuranceHomeOffice,OwingsMillsCorporatePark,MD199315yearslater…AndwhatquestiondidtheCEOnotask…?LatestRootAerationMat(RAM)from1996-2008SpecialtyTriplePlyGeocompositeFlexible,easeofinstallation,lessexpensiveCAUTION:ExperiencedGeotechnicalSpecialistprescribedforeachsoils&loadingpotential.Specification,layout,installation,onlyunderdirectionofCertifiedArborist/Foresterexperiencedinrootengagingtechnologies.RootAerationSystemDesignGuidelineforPreservingTreesinConstructionGradeFillsThishandoutwasdesignedtoassistsitedesignprofessionalsoragencyreviewingstaffwithbasicunderstandingofobjectives,limitations,andparameterstoconsiderintreepreservationdealingwithissuesofproposedgradefills.ThepurposeoftheRootAerationMat(RAM)istwo-fold:first,toprovidenecessaryair/gasexchangebetweentheatmosphereandthecriticalrootzonethatwillbecoveredbyaproposedgradefillsituation;andsecond,tospreadthisloadingandprovideastablebaseinconjunctionwithotherengineeredmaterialstosupporttheproposedstructuralornonstructuralfills.Rootsoftreesforthemostpartrequireporoussoilsof80%compactionasfoundinforestsoils.Evenfillsofafewinchesovertheexistinggradeofrootscanbringaboutsuffocationandtoxicbuildupinashorttime.RootAerationSystemshavebeenemployedsuccessfullyformanyyearsinawidevarietyofconstructionscenarios,includingretainingwalls,parkinglots,statehighways,andtoeofslopeconditions.Eachsiteandapplicationvariesthusmaterialsanddesignwillvary.TheCareofTrees,Inc.Forestersfamiliarwithtreerootstructureandfunctioninginrelationtospecies,soils,andmoistureregimeimpactedbyconstructionsituationswillreviewthedesignscenarioandsite,prescribespecifications,layoutandsuperviseinstallation.Ourlatestmethodsandmaterialsarebeyondthosefoundinstateorlocalmanuals.Caution:Onlylicensedprofessionalswithmuchexperienceinrootsysteminvestigationsandimpactfromdesignandconstructionimpactsshouldattempttospecifyandprescriberootengagingtechnologies.Tomeetstructuralconcernsanexperiencedgeotechnicalprofessionalshouldbeengagedinproductandmaterialsselectionsunderproposedpavingorcurbs.

Thefollowingarestepbystepguidelinesthatapplytoawidevarietyofsituations:1.TheProjectForesterorISACertifiedArboristwilldeterminethehealthandconditionoftreesinconsideration.

Willthetreewithstandaddedconstructionstress?Aretheyworthyofconsiderationforspecialpreservationmeasures?Whatispastmaintenancehistoryorpriorimpactsfromsitedevelopment?2.Baseduponaccuratetreesurveylocationincludinggradesatbaseoftree,determinetheappropriateCriticalRootZoneforthetree(s.

Investigativediggingmaybeneededsincerootsvaryinwidthanddepthwithspecies,soiltype,moisturelevel,andurbaninfrastructureinvolved.(RefertoCRZHandoutsheets)3.ProjectForesterwillreviewgradingandutilityplanswiththeappropriatedesignteam.

HowandwherewillcutandfillimpacttheCRZ?HowwillproposedutilitiesimpactCRZ?Arethereoptionsforutilityplacement?

4.DeterminehowmanysquarefeetofRootAerationMatareneeded?5.Nosoilshouldevercontactthatpartofthetreenormallyaboveground.

Howissoiltobekeptfromthetrunkorrootflare?Ifaretainingwallisneededwhatdesignandmaterialwillfitthetreerootsystembasedupontheinvestigativedig?6.Theprojectforesterwilldesigntheappropriateventingsystemtofitthesiteandobjectives.

HowwilltheRAMbeventedtoatmosphericconditionsfortheair/gasexchangetothesoilsurface?Willaretainingwall,curb,ortoeofslopebeused?7.Forinstallationunderstructuralfillsthereviewofageotechnicalprofessionalisrequired.Wewillnotinstallstructuralsystemsunlessageotechnicalhasreviewedandapproved.Ifnoneareavailablethatarefamiliarwiththissystemwecanprovidegeotechnicalanalysisandanswerdesignloadingquestions.

8.Forstructuralfillstypically24”isminimumneededbetweenexistinggradeandproposedfinishgradeofpavement.

Geogridsandotherstabilizationmethodscanbeprescribedwhenlessthan24”isavailable.9.Resolveadditionalpertinentdesign/constructionissues:10.Whatwillbetheappropriatesequenceofeventstofacilitateconstructionbutnotcompromiseprotectionofthetreerootsystem? b.Willtheest.impacttothetreesrequirerelatedtreeprotectionitemssuchasrootpruningandsilt/treeprotectionfence?Howwillthosebesequenced? c.Willadditionalarboriculturespecificationsbeprescribedfortheimpactedtrees?Thesemayincludemulching;fertilization/soilconditioners;;crownpruning;cabling/lightningprotection;andIPMneeds. d.Howwillselectiveremovalofsaplings,brush,andvineswithintheprotectedCRZbeprescribed?11.AllworkwithintheCRZshallbelaidoutbytheprojectforesterorarboristandreviewedbythelandscapearchitect/civilandsitesuperintendent.InstallationshouldalwaysbebyISACertifiedArboristwithexperienceinthistypeofwork.Budgetnumberfortherootaerationmatsystemsisusuallybetween$2.00-3.00/squarefootinstalleddependingupondegreeofdifficultyandeconomiesofscale.Forasite/treeassessmentandplanreviewcontactoneofourlocaloffices.Foranin-officeeducationalpowerpointpresentationregardingtheseandotherstateofthearetreepreservationplanning,design,orconstructionmeasures,callthebelowoffice. TheCareofTrees,Inc.,theleaderin“rootengagingtechnologies”.SustainingRoots-DesignGuidelineforPreservingTreesinConstructionGradeFillsThepurposeoftheRootAerationMat(RAM)istwo-fold:1)Provideatmosphericgasexchange,2)Stabilizeandspreadtheload.RootsoftreesforthemostpartrequireporoussoilsNosoilshouldevercontactthatpart

ofthetreenormallyabovegroundTheprojectforesterwilldesigntheappropriate

ventingsystemtofitthesiteandobjectivesForinstallationunderstructuralfillsthereview

ofageotechnicalprofessionalisrequiredForstructuralfillstypically24”isminimumneededbetween

existinggradeandproposedfinishgradeofpavementResolveadditionalpertinentdesign/constructionissuesAllworkwithintheCRZshallbelaidoutbytheprojectforester

orarboristandreviewedbythelandscapearchitect/civiland

sitesuperintendentHowdowesustainrootsadjacenttobuildingexcavationsbutstillallowroomtobuild?

HealthyRootsattheedge-AsolutiontotheinterfaceofSuperSiltFenceLOD/TPFthatavoidscuttingrootsforSSFHowdowebuildamasonrystructure

between2prizedmaturetrees?IncorporateRootProtectionMatting(RPM)intothedesignandconstructionPrivateresidenceonHillmeadRd,Bethesda,MD.RootProtectionMatSpecificationsRootProtectionMatwithinCRZs(asdesignatedonTPAK):ObjectiveofRPMistoallowdesignatedconstructionactivitieswithinthetreesprotectedcriticalrootzonewithminimalcompactionorruttingtosurfacesoilsandrootsystem.MethodsandproceduresfordemolitionofRPMisjustascriticalastheproperinstallation.RPMspecificationsarealwaysafunctionofparentsoilmake-upandprojectedloading(staticVSdynamiccompaction)andfrequency/numberoftrips.Soilmake-upcanvarywithseasons(wetvsdry).Experiencedgeotechnicalrepresentativeshouldbeconsultedonceexactloadingpotentialisknown.Exactlocation/layoutofRPMtobeapprovedbyprojectforester.Storm&SanitarySewerExcavationwithsteeltrackedexcavator:-2layersRPMoverwoodchipswithAlturnamatWaterlineorconduitexcavationusingrubbertrackedmini-excavatorwithpsi4.2orlesswithoperatorandload):-2"mulch+TriplanerGeonet(doublesided)forequipmentoperationandsoilsstockpilewithinCRZofprotectedtrees.TemporaryMobileHome/ConstructionTrailerwithnovehicleparking--sameasabove.UseRubbertrackedskidsteerforinstallation.AllaccesswithinCRZsonRPM.Staging/StockpileAreaforheavyequipment/truckswithinCRZs--AmerdrainSoilDrainageMat+TriplanarGeonet+Bi-axilGeogrid+12"Crushedstonewithsiltfence(installedon-grade)perimeter.AboveStaging/StockpileoutsideCRZsuseonlyGeonetwithcrushedstone.AddGeogridifconcretetrucksorconstructionforkliftsareusedrepeatedly.RecommendinstallationonlybycontractarboristexperiencedinRootProtectionMattingf