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TheMonongahelaSouthNo.1DangerousHighwallReclamationProject,CityofMonongahela,PennsylvaniaTypicalPennsylvaniaDangerous

HighwallReclamationProjectTheMonongahelaSouthNo.1DangerousHighwallReclamationProjectwasveryuniqueprojectandeverythingbuta

TypicalReclamationProjectSiteoftheWhiskeyRebellionProjectLocationPittsburghMonongahelaSouthNo.1ProjectSiteBackgroundThesiteislocated~15milessouthofPittsburghThesitewassurfaceminedfrom1945to1947A1,000ft.longhighwall(averaging40ft.high)andbenchwereleftTheDioceseofPittsburghacquiredthepropertyin1950ConstructionofSt.Anthony’sChurchwascompletedonthebenchatthesitein1952Theparochialschooladjacenttothechurchwascompletedin1954SiteConditionsSt.Anthony’sChurchSt.Anthony’sParochialSchoolSt.Anthony’sParishHouseTheProblemSignatEndofChurchStreetaboveHighwallHighwall–WestEndofSiteHighwall–MiddleofSiteHighwall–EastEndofSiteHighPotentialforContinuedRockFalls–SchoolClosedDesignSummaryDesigncompletedbyGAIConsultants,Inc.ofPittsburgh,PAAwardedatwo-phasedesigncontractinJune2002Phase1–AlternativesanalysisCompletedinOctober2002Cost:$24,860Phase2–FinaldesignofpreferredalternativeCompletedinMarch2003Cost:$68,423SelectedAlternativeExcavationoftheunstablehighwalltoreducetheslopeoftheeasternendofsiteConstructionofasoldierpileandlaggingretainingwalltostabilizethewesternendofthehighwallDuetotheproximityofhomesandChurchStreetabovethehighwallandtheschoolandParishhousebelow,cuttingthehighwallbackinthisareawasnotfeasibleDesignChallengesSafety(forboththecontractor’semployeesandthegeneralpublic)Long-termstabilityofthereclaimedsiteConstructionandmaintenancecostsAccommodatingthelong-rangeplansoftheParishMaintainingnormaloperationofthechurchduringconstructionDesignChallengesDisposalofexcessfillmaterialIncidentalcoalextractionSealingabandonedmineopeningslocatedatthebaseofthehighwallManagementofbothstormrunoffandminedrainageConsiderationofpotentialminesubsidenceissues/problemsDesignChallengesConstructabilityoftherecommendedreclamationmethodWorkinginanurbanenvironmentImpactsonnearbyresidentialpropertiesPermittingandotherrequiredapprovalsContractingSummaryAdvertisedforbidsinApril2003OriginalbidopeninginMay2003AllbidsrejectedConsultantEngineer’sEstimate:$923,000Lowbid:$1,450,000Projectre-bidJuly2003LowbidacceptedAlexE.ParisContracting,Atlasburg,PABidprice:$1,249,826ProjectConstructionSiteAccessAccessfromStateRoute481–ParkAvenueAccessBetweenHighwallandBuildings12feetStagingArea/ParkingLotErosionandSedimentationControlsSlopeReduction–EasternEndofProjectSiteInitiationofExcavationforHighwallSlopeReduction––EastEndofProjectSiteBenchonCutSlopeExcessSpoilDisposalCityofMonongahelaDisposalSiteIncidentalCoalExtractionPittsburghCoalSeam(Avg.SeamThickness6-8feet)CoalSeamCoveringWireMeshReinforcementFiber-ReinforcedGroutApplicationFinishedCoalSeamCovering–LookingWestAMD/StormwaterCollectionSystemUpgradeofStormSewerSystemalongParkAvenue,SR481NewStormSewerSystemforSt.Anthony’sParkingAreaandChurchStreetRunoffConveyanceChannelonCutSlopeBenchInstallationofMineDrainageConveyancePipelineInstallationofMineDrainageConveyancePipelineSealingofMineEntriesMineOpeningatBaseofFinishedCutSlopeMineEntriesCleanedOutPerforatedMineDrainPipeInstalledinEachEntryMineEntryBackStowedwithStoneBlockWallSealConstructionFinishedMineSealConstructionMineGroutingforSubsidenceControlGroutInjectionBoreholesGroutInjectionBoreholeRockFaceSupportSystemDrillingAnchorHolesMaterialsBoltPlatesAllThreadRodsCenterStabilizersRockNettingBoltsMaterialsEpoxyResinResinCartridgesRockNettingandSteelCableCableEyeBoltsInstallingRockNettingBoltsFinishedRockNettingCovering––LookingEastSoldierPileandLaggingRetainingWallClearingofSlopeAboveHighwallRemovalofAbandonedUtilityLinesDrillRigforDrillingofSoldierandAnchorPileHolesTemporaryBoreholeCasingAnchorPileBeamsAnchorPileRebarConcretepouredaroundAnchorPileInstallationofSoldierPileBeamsConcretePouraroundSoldierPilesWingWallatWestEndofRetainingWallWalerSupportBracketsInstallationofWalerSupportsConcreteLaggingPanelsInstallationofConcreteLaggingPanelsUnloadingofWalersWalerInstallationWalersInstalledWallTiebackAnchorRodsTorqueWrenchforInstallionofTieBackRodsTorqueGaugeInstalledTieBackAnchorRodsStackerforPlacementofWallBackfillCompletedStoneBackfillBehindWallSlopeFailureandCollapseofMineOpeningConstructionProblems:SoilSlipAboveRetainingWallSoilSlipAboveRetainingWallDamagetoCutSlopeBenchasaResultofMineOpeningCollapseMicropileInstallationRemovalofSlideMaterialDrillingforMicropileInstallationGroutMixingKettlesGroutingofMicropiles(SoilNails)GroutingOperationCompletedSoilAmendmentsAppliedtoRe-gradedSlopeMulchBlanketInstalledtoSlopeRockNettingAnchoredtoMicropilesCompletedSlopeStabilizationWorkCompletedSlopeStabilizationWorkStabilizationofFracturedHighwallPlacementofR-8Rip-RaptoStabilizeCollapsedMineOpeningGroutedR-8Rip-RapRepairAreaGroutedR-8Rip-RapRepairAreaRestorationofCutSlopeBenchDropZoneandJerseyBarriersFinishedDropZoneBarrierFinishedDropZoneBarrierSecurityFencingSecurityFencing–EastEndofSiteSecurityFencing–TopofFinishedCutSlopeSecurityFencingandBarrieratEndofChurchStreetPostConstructionFinishedCutSlopeandBench–EastEndofProjectSiteFinishedCutSlopeandRockFaceSupportSystem-WestEndofProjectSiteFinishedCutSlope,RockFaceSupportSystem,CoalSeamCoveringandRetainingWallViewofFinishedProjectfromabovetheRetainingWallFinishe