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MADC5isatwophaseconstructionprojectwhichbeganpreconstructioninearlyJuly2007.Itisa

uniquephasingplansincetheentirebuildingcoreandshellwillactuallybebuiltwithonlytheinterior

portionofthebuildingbeingphased.

Theprojectspreconstructionanddesignphaseslastedforeightmonths.Theweatheratthistimeis

muchmorefavorableforconstructionsincethewintermonthsfinishjustasthesiteworkwasscheduled

tobegin.ConstructionmobilizationwasinitiatedinearlyFebruary2008,whichisaslightoverlapofthe

preconstruction/designphase,followedimmediatelybysiteworkandfoundations.

PrecasterectionbeganinearlyMay2008,justasthefoundationworkwasfinishing,andlasted

approximately4months,makingitthelongestconstructiondurationfortheproject.Theprecastwas

sequencedusingtwocrewsthatwerespacedaboutaweekapart.Crew1placedprecastmembers

betweencolumnlinesAD,whileCrew2placedmembersbetweenDG.PleaseseeAppendixBfora

completedetailoftheerectionplan.

Unlikemosttypicalbuildingschedules,theinteriorworkbeginspriortobeingwatertight.Thisismainly

duetothefactthattheprojectisonsuchatightschedule.Iftheprojecthadtowaituntilthebuilding

waswatertight,thentheprojectdurationwouldbeextendedatleast4months.Instead,theinstallation

ofMEPoverhead,fireprotection,interiorpartitions,MEPequipment,accessfloors,anddoorsand

hardwarecanoccuroncethereisenoughslabongradepoured.Overall,theinteriorworkisdiligently

completedasaparadeoftradeswithineachroomprogressingfromwesttoeast.

PleaseseeAppendixBforthesummaryGanttchartforMADC5.

ConstructionforMADC5beganinearlyFebruary2008.TheprojectisscheduledtofinishinearlyMarch

2009,justover13monthsofconstruction.Beingthatthebuildingisapproximately360,000SF,a

detailedconstructionscheduleisvitaltosuccessfullycompletingsuchalargescaleprojectinashort

amountoftime.Appropriatephasingandsequencingwasutilizedthroughouttheprojecttofacilitate

theprocess.

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April 7,2009

Theoveralldurationissomewhatdeviousduetothewaytheprojectwasphased.Thirteenmonthsto

completealargeprojectisquiteimpressive,however,thebuildingwillnotbefullybuiltoutduringthat

period.InteriorworkforMADC5isphased,whiletheentirebuildingshell,foundations,MEP

underground,andslabongradewillbeconstructedasoneentity.Phase1andPhase2evenlysplitthe

buildingwiththeofficeportionconsideredPhase1construction.Eachphasehasfourteencomputer

rooms,eightUPSrooms,eightenginegeneratorrooms,onemediumvoltageroom,andonechiller

plant.Phase2constructionwillbehelduntilreleasedbytheowner.

Figure4depictstheoverallfloorplan,firstlevelontopandthemezzaninelevelonthebottom,for

MADC5.ThelightbluesectiononthewestsideofthebuildingisconsideredPhase1.Phase2isthe

areashownasthedarkbluesectionontheeast.

PleaseseeAppendixBforthedetailedGanttchartforMADC5.

Figure4Overallplanshowingthetwophases.

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Thenatureofthebuildingisdirectlyresponsibleforthewaythattheprojectwassequenced.Firstand

foremost,thereare21subcontractorswithapproximately500workersonsite,whichcausessevere

congestionanddelaysifleftunorganized.Toremedythis,theconstructionmanagerhasdevelopeda

specificsequencewhereworkprogressesasaparadeoftrades,beginningonthewestandadvancingto

theeast.Assoonasatradehasfinishedworkinagivenarea,thenexttradefollowsimmediatelyin

ordertomeetthetightschedule.Sitework,foundations,undergroundMEP,andprecasterection

initiatetheparade.Approximatelytwoweeksafterprecaststarts,slabongradeworkbeginsforthe

computerrooms,UPSrooms,andenginegeneratorroomsandfollowsinthesamedirection.Likewise,

oncetheconcretehascuredenoughandtheconcretecontractorshaveadvanced,interiorworkonthe

aforementionedroomsensues.Unlikemostcaseswhereabuildingiscompletelyenclosedpriorto

interiorwork,interiorconstructionbeginsassoonastheimmediatelysurroundingareaiswatertight.

Forexample,finishesareinstalledinthefirstcomputerroomonthewestsidewhiletheentireeastside

ofthebuildingisexposedtotheelements.Thissequencingplancontinuesforthedurationofthe

project.

Thefollowingthreetables,Table4,Table5,andTable6,illustratethetypicalroomsequencesfor

computerrooms,UPSrooms,andenginegeneratorrooms:

Table4ComputerRoomSequence

Duration

Activity

SealConcreteFloors 2d

MEPOverhead/PullWire 10d

FireProtection 5d

BelowFloorChilledWaterPipe 15d

PaintPrecastTees 5dInteriorPartitions 5d

MEPRoughInPartitions 5d

PrimePaint 5d

LightingBuss/Fixtures/FireAlarmDevices 10d

InstallEPOKiosk 5d

SetDBoards/Terminate 5d

InsulateChilledWaterPiping 5d

Pipe/InsulateCRAH's 5d

UnderfloorFireAlarm 5d

SetCRAHStands/CRAHUnits 10d

IncipientDetection 10d

FinishPaint 5dGroundingGrid 5d

AccessFlooring 5d

Doors/Hardware 5d

Base 2d

Superclean 4d

FinalClean 5d

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Table5UPSRoomSequence

Duration

Activity

SealConcreteFloors 1d

PullCable 10d

MEPOverhead 15d

InteriorPartitions 10dPaintPrecastTees 2d

"SetSwitchgear(M's,C's)" 5d

FireProtection 5d

MEPRoughInPartitions 5d

PrimePaint 1d

SetCRAHUnit/Terminate/Pipe 10d

InstallOverheadBuss 5d

TerminateSwitchgear 5d

SetPillerUnit 5d

Lighting 15d

Doors/Hardware 5d

SetIP 5d

TerminatePiller/IPUnits 10d

FinishPaint 3d

Base 2d

FinalClean 5d

Table6EngineGeneratorRoomSequence

Duration

Activity

InstallLouvers/Attenuation/Dampers/PlenumsNorthWall 15d

MEPOverhead 5d

PourConcreteFuelCurbs 2d

FireProtection 3d

InteriorPartitions 5dSet/PipeDayTanksEG1Aand1B 15d

MEPRoughInPartitions 5d

EpoxyMembraneinFuelContainmentCurbs 2d

PaintPrecastTees 2d

PrimePaint 2d

Lighting 15d

InstallExhaustSupportsandMufflers/SCR's 15d

SetEG1Aand1B 5d

FinalMufflerConnections 2d

InstallLouvers/Attenuation/Dampers/PlenumsSouthWall 10d

PullCable/TerminateEG1Aand1B 20d

InstallPlenumFromRadiatortoLouvers 2dFinishPaint 3d

EpoxyGeneratorRMFloors 5d

InstallUnitHeaters 5d

Doors/Hardware 3d

CompletePneumatics 3d

Base 1d

FinalClean 5d

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Table7ProjectCostBreakdown

Cost Cost/SF

OverallCostsActualBuildingConstructionCost $148,720,000 $414

TotalProjectCost $170,916,000 $475

BuildingSystemsCosts

BuildingConcrete $8,957,000 $25

StructuralPrecast $1,696,000 $5

AccessFloor $2,110,000 $6

FireProtection $1,308,000 $4

Mechanical $33,232,000 $93

Electrical $47,087,000 $131

Security $1,150,000 $4

MechanicalControls $3,100,000 $9MechanicalEquipment $4,406,000 $13

ElectricalEquipment $26,798,000 $75

TotalBuildingArea: 360,000SF

TotalBuildingPerimeter: 3,646LF

StoryHeight: 236FT

RSMeansValue: $137.50/SF

StoryHeightAdjustment: Negligible

PerimeterAdjustment: Negligible

TimeAdjustment: CurrenttimeNoadjustmentneeded.

LocationFactor: 0.92(Fairfax,VAisclosestlocationtoAshburn)

FinalRSMeansValue: $126.50/SF

ProjectTotalCost: $45,540,000

AsshownaboveinTable7,theRSMeansSquareFootEstimateisnotevenclosetotheactualcostof

thebuilding.MADC5isanextremelylargedatacenterthatcannotbeaccountedforusingRSMeans,

whichonlysizesupto40,000SFand800LFwhereasMADC5is360,000SFand3,646LF.Anyadjustments

tothestoryheightandperimeterwouldhaveanegligibleeffectonthesquarefootvaluesincethevaluesdecreaseasthesizeofthebuildingincreasesandthedifferencesbetweenthevaluesisso

extreme.Inaddition,thebuildingestimatedoesnotaccountforthe$33millionofMEPcontrolsand

equipmentinvolvedwiththedatacenter.PleaseseeAppendixCforthedetailedRSMeansSquareFoot

analysis.

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TotalProjectCost: $19,579,868 $55/SF

TotalBuildingCost: $18,179,868 $51/SF

Unfortunately,theD4CostEstimatesoftwaredoesnothaveadatabaseforanythingsimilartoadata

center.Thisismorelikelyattributedtothefactthatdatacentersaremoreofanewdesignin

comparisontothetypicalcommercialbuildingsfeaturedinthesoftware.Therefore,theD4Cost

softwareisinappropriatetouseforestimating.Toillustratethis,anestimatehasbeendevelopedbased

offanindustrialbuilding,SiemensWestinghouseFuelCellFacility,withsizedat190,000SF.Asshown

above,thetotalprojectcostisapproximately$150millionshortofthetrueestimate.Pleasesee

AppendixCforthedetailedD4CostParametricanalysis.

MADC5hadacombinationofconstructionrequirements,insuranceandpermits,generalconditions,

andlaborfallingwithinthegeneralconditionsthatgeneratesanestimateamountof$7,025,338,as

showninTable8below.Incomparisontotheoverallprojectcost,thisnumberisapproximately4.1%oftheoverallbudget.Thevaluemaybeslightlylowthentheaveragepercentandcouldbeattributedto

thefactthattheconstructioncontingencywasnotincludedaswellasdifferingstaffingcosts.

Table8GeneralConditionsSummary

PleaseseeAppendixCforadetailedbreakdownoftheGeneralConditionsestimate.

Thefollowingassumptionsweremadethroughouttheestimateprocess:

x CostDataprovidedbyRSMeans2008andHolderConstructionCompany.Thenumbersfrom

HolderwereprovidedasestimatesbasedontheirhistoricaldataandRSMeans.Thesevalues

werederivedbymyselfandprojectteammembers.

x RSMeans2008wasutilizedtoderiveindividualstaffingsalariesforthejob.

x WherestaffsalarieswerenotavailableinRSMeans,alogical10%increasewasusedforeach

respectivelevel.

x ValuesprovidedfromHolderwerelumpsumamounts,notaunitcost.Thus,thetotalcostwas

dividedbytheprojectdurationtoderiveacost/unitvalue.Thisvaluewillbebeneficialfora

futureanalysis.

x ConstructionDurations:13monthsor58weeks

o Nonworkingdaysandholidaysarenotaccountedfor,ratherbasedoffofthestandard

calendar

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x Staffingdurationsarebasedoffofstartdatesonthejob.(InformationreceivedfromHolder)

x Allstaffisassumedtobeonthejobthroughcompletionsincetheprojectteamisunsureof

statusofPhase2.

Alltakeoffcalculationsforthestructuralestimatewereperformedbyhandbasedoffoftheconstructiondocumentsandprecastshopdrawings.Aspreviouslymentioned,thedatacenterportion

ofthebuildingissymmetrical;therefore,thetakeoffneededtoonlybepreparedforhalfofthebuilding

andsimplymultipliedbyafactoroftwotoaccountfortheotherhalf.Acompletetakeoffhadtobe

doneforbothfloorsoftheofficebuildingsincethisportionwasnotsymmetrical.

Thefollowingassumptionsweremadethroughoutthetakeoff:

x Allconcreteispumped.

x Formworkwasaddedasanallowancevalueprovidedbythecontractor(whousesRSmeansand

historicaldata)duetosporadicusethroughouttheproject.

x OpenShoplabor

x Fairfax,VAwasusedasthelocationfactor(0.92).ItwastheclosestcitytoAshburn;however,

thecostmaybehigherduetoaslightlyhighercostoflivinginFairfax.Thecalculationsinclude

thisfactorwithintheunitcosts.

x Overheadandprofitareomittedfromthecostestimate

x RSMeans2008Onlineandaverageunitcostestimatesfromtheprecastsubcontractor(The

ShockeyPrecastGroup)wereutilizedforthecostcalculations.

PleaseseeTable9belowforasummaryofthestructuralsystems.Acompletedetailedestimatecanbe

foundinAppendixC.

Table9StructuralSystemsSummaryEstimate

StructuralSystemsSummaryEstimate

Division Description TotalCost

02465 Caissons $161,716

03210 Rebar $436,486

03220 WeldedWireFabric $260,850

03310 NormalWeightConcrete $2,051,131

03310 FormworkAllowance $270,000

03310 ConcretePlacement $403,763

03310 CIPPiers $267,630

03310 CIPSpreadFooting $344,501

03310 CIPContinuousFooting $126,055

03310 CIPSlabonGrade $1,821,380

03310 CIPToppingSlab $1,242,534

03310 CIPStairs $3,063

03410 PrecastConcrete $9,219,840

TOTAL $16,608,949

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TheestimatetotalforMADC5is$16,608,949.IncomparisontotheTechnicalAssignment1assignment,

thisnumberismuchlowerwithapercentdifferenceof25.12%.However,thevaluesutilizedforTech.1

werebasedoffofpreliminaryvaluesfortheproject.Amorerecentestimateinvolvingthescheduleof

valuesforthestructuralsystemsprovidesamuchstrongerestimatetocompare.PleaseseeTable10

belowforthecomparison.

Table10StructuralSystemsCostComparison

System Tech1 Tech2 System SOV Tech2

PrecastConcrete $11,695,484 $9,219,840 PrecastConcrete $9,706,654 $9,219,840

CIPConcrete $8,956,928 $7,227,393 CIPConcrete $7,204,000 $7,227,393

Caissons $728,079 $161,716 Caissons $493,044 $161,716

Total $21,380,491 $16,608,949 Total $17,403,698 $16,608,949

%Difference 25.12% %Difference 4.67%

DifferencesbetweentheTech.1,thescheduleofvalues,andTech.2valuescanbeattributedtoseveral

items.Closeoutcosts,changeorders,mobilization/demobilization,andshippingarenotaccountedforwithintheprecastconcretevalue.Initially,thelargediscrepancybetweentheCIPconcreteestimatesis

duetoinclusionofcloseout,changeorders,contingency,contractorsfee,constructionrequirements,

andexcavationcosts.Asforthecaissonestimate,entitiessuchasmobilization/demobilization,bonds,

layout,extrareinforcement,andcloseoutareresponsibleforthecostgap.Overall,differingunitprices

betweenRSMeansandcontractor/subcontractorvaluesallinfluencethe4.67%differential.Fora

bettercomparisonofthematerialsandlabor,theabovementionedentitieshaveallbeenremovedfrom

oftheoriginalestimate.