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U"lity Op"miza"on: Lessons from the Sea7le Seawall Presented by Sco7 Goss, SG3 Strategies

Lorelei Williams, Director, SDOT Capital Projects and Roadway Structures

PROJECTOVERVIEW

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PARTICULARCHALLENGES

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APPLICABLELESSONS

•  Independence

•  PreparaAon

•  Flexibility

INTRODUCTION

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PROJECT LOCATION

WATERFRONT SEATTLE’S FOUNDATION

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PURPOSE AND NEED

VALUE AND ROLE OF UTILITY COORDINATION

Coordina"on is not design

•  IssueanAcipaAon

•  InterdisciplinarycoordinaAon

•  Problemsolving

•  Non-designaspects

•  Makingsenseofapparentchaos

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•  InthelastslideyousawabitoftheexisAnguAliAesunderPier57.

•  DemoliAonconsistedofremovingthesidewalk,seawallandeverythingdowntotherelievingpla[ormforawidthofabout35feet,by3300feetlong.

Demoli"on

Protect-in-place13.8kVelectricalductbankswithexposedconduits

Working Around Live U"li"es

PARTICULAR CHALLENGES

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•  NotdesignedforuAliAes

•  LimiAngfactorforhanginguAlityservices

•  IntegralunistrutforuAliAes

Light Penetra"ng Sidewalks

•  Contractordecidedtoremovethecontainmentwallinthisarea(notthewholesite)

•  AllworkwasthendrivenbyAdes

Tidal Influence

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•  Newlidsonliveelectricalvaults

•  Falsework

•  Exactgradecontrol–norisers

•  Jetgroutheave

When Adjustment Is Not An Op"on

•  Schedule

•  UAlitycrewavailability

•  UAlityinspectors,hotwatches,metercrews

•  Specialtygasmainworkers

•  CableandfiberopAcsplicers

Don’t Underes"mate The Influence Of U"li"es

LESSONS LEARNED

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Sequencing U"li"es

•  Newelectricalductbankswereamajorschedulefactor

•  CoordinaAonwithsewer,water,telecomandgas

Improving access

•  SPUaddedvaultstoallservices

•  Nomoredirect-buryfirevalves

•  Replaced1934lead-jointironpipewithpowder-coatedducAleiron

•  AddedcathodicprotecAon

•  Higher,sonotingroundwater

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PrivateuAliAesdon’talwaysknowwheretolocatetheirfaciliAes.

•  ProvidedplanandprofileforPSEgas

•  DefinedconduitrouAngforalltelecoms

•  ControlledforfuturecondiAons

Expect To Do It All

•  Itendsupeverywhere

•  Hydraulicforceslid,heaveandcrush

•  Groutfillsallvoids,includingpipesandvaults

•  Don’texpectjetgrouAngtoprotectuAliAes

Jet Grou"ng

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Hidden Obstruc"ons •  Concreteductbankoverpours

•  WAC19.122.020(23)"Reasonableaccuracy"meanslocaAonwithin24inchesoftheoutsidedimensionsofbothsidesofanundergroundfacility

•  AbandoneduAliAes–idenAfythem,orexpectchangedcondiAonsclaims–dotheresearchinadvance

•  3700’longby40’wideby14’deep,rightnexttotheviaduct

•  TradiAonalpumpingwasexpectedtocausedrawdowneffectandviaductseglement

•  Soilfreezingforwatercutoff

•  TakesAmetofreeze

•  IceexpandsoverAme

•  Frozenelectricalductbanksandwaterservices

•  TakesAmetothaw

Soil Freezing Instead of Dewatering

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Soil Freezing Instead of Dewatering

Live U"lity Maps

•  Immediaterecordofdailychangestoreflectnewandremoveditems

•  Contractor’sdailydigpermitrequiredreviewofdailymapandcopiesintheequipment

•  Createsalivingdocumentandimprovessafety

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•  12”HPmainreplacement

•  WeldingsteelinadeeptrenchtakesAme

•  Polyethyleneismuchfaster

•  Gasworkednightssothejobran24-hourdays

•  Majorsafetyconcern

Gas Reloca"on

Telecom Reloca"on

•  GelngtheiragenAon

•  Schedulingspecialtycrews–copperandfiber

•  Don’tforgetsplicingAme–2400pairstakesawhile

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Coordina"on is Not Design…Except When It Is

UAlitycoordinaAonworksbestwhenindependentofcoredesignfuncAon,buttherecouldbemore“designservicesduringconstrucAon”thanexpected.

•  “Pleaseredesignthe(sewer,water,gas,storm,telecom,etc.)forwork(today/tomorrow/nextweek)”

•  Beflexibleandbereadytomakechangesimmediately,asin“westoppedwork,nowwhat?”

•  Structuralsupportdesignnotfollowedinthefield

•  Nosupervision

•  Followtheloadpath

•  Severecracking

•  Scheduleimpactof300’ofunplannedductbankreplacement

Suppor"ng Electrical Duct Banks

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Support Ma7ers!

Suppor"ng Electrical Duct Banks

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U"lity Coordina"on •  MeeAngs,meeAngs,meeAngs

•  Mapsandroll-plots

•  Lesson:Learnhoweverythingworksandhowitisbuilt

The closer you look, the more complex it is.

•  Planahead

•  Knowwhat’snext

•  Don’tcutcornerstomaketodayeasier

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Benefits from Dedicated U"lity Coordina"on

•  GetaheadofprojectcomplexiAes

•  ImproveconstrucAonsafetyandefficiency

•  Happierend-users(begercustomerservice)

•  INDEPENDENCE:UAlitycoordinaAonworksbestwhenindependentofcoredesignfuncAon,buttherecouldbemore“designservicesduringconstrucAon”thanexpected

•  PREPARATION:DotheuAlityresearchhomeworkbutbepreparedtomakechangesinthefield

•  FLEXIBILITY:UAlityprotecAonandrelocaAonmaybeabiggerpartofyourprojectthaniniAallyprojected

Conclusions

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•  Inherentlystablebutonlyuptoacertainpoint

•  VehicleloadsaccountedforbutaddedloadsfromuAliAeswerenegoAatedwiththeuAlityprovidersandtherearecontrolsonnewuAlityaddiAons

Precast Zees

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Light Penetra"ng Sidewalks

Wall Face Panels