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www.osha.govUndergroundConstruction(Tunneling)OSHA3115-06R2003ThisinformationalbookletprovidesageneraloverviewofaparticulartopicrelatedtoOSHAstandards.ItdoesnotalterordeterminecomplianceresponsibilitiesinOSHAstandardsortheOccupationalSafetyandHealthActof1970.Becauseinterpreta-tionsandenforcementpolicymaychangeovertime,youshouldconsultcurrentOSHAadministrativeinterpretationsanddecisionsbytheOccupationalSafetyandHealthReviewCommissionandtheCourtsforadditionalguidanceonOSHAcompliancerequirements.Thispublicationisinthepublicdomainandmaybereproduced,fullyorpartially,withoutpermission.Sourcecreditisrequestedbutnotrequired.Thisinformationisavailabletosensoryimpairedindividualsuponrequest.Voicephone:(202)693-1999;teletypewriter(TTY)number:(877)889-5627.�UndergroundConstruction(Tunneling)U.S.DepartmentofLaborElaineL.Chao,SecretaryOccupationalSafetyandHealthAdministrationJohnL.Henshaw,AssistantSecretaryOSHA3115-06R2003ContentsIntroduction…4ConstructionoperationscoveredbytheOSHAstandard...4EmployersandemployeescoveredbytheOSHAstandard...5RequirementsoftheOSHAstandard...6Theneedfora“competentperson”...6Trainingrequirements...6Notificationandcommunicationrequirements...7Sitecontrolprocedures...8Check-in/check-outprocedures...8Controlofaccessandegress...9Groundsupportofportalandsubsidenceareas...9Groundsupportofundergroundareas...9Groundsupportofshafts...10Firepreventionandcontrol...10Ventilationrequirements...12Illuminationrequirements...13Specialairmonitoringrequirements...13Testforoxygenfirst...14Testingformethaneandotherflammablegases...14Hydrogensulfidelevels...15Specialconditionsfordrillingandblastingunderground...152Specialrequirementsforusingcranesandhoistsunderground...16Potentialhazardsthatrequirespecialprecautions...18Gassyorpotentiallygassyoperations...18Emergencyprocedures...21Recordkeepingrequirements...22OSHAassistance...22Safetyandhealthmanagementsystemguidelines...22Stateprograms...23OSHAconsultationservices...23TheOSHAVoluntaryProtectionProgram(VPP)...24StrategicPartnershipPrograms...25TheOSHAAllianceProgram...25OSHAtrainingandeducation...26Informationavailableelectronically...26OSHApublications...27ContactingOSHA...27OSHARegionalOffices...283�IntroductionTheconstructionofundergroundtunnels,shafts,chambers,andpassagewaysareessentialyetdangerousactivities.Workingunderreducedlightconditions,difficultorlimitedaccessandegress,withthepotentialforexposuretoaircontaminantsandthehazardsoffireandexplosion,undergroundconstructionworkersfacemanydangers.Tohelpemployersprotectthesafetyandhealthofunder-groundconstructionworkers,theOccupationalSafetyandHealthAdministration(OSHA)haspreparedanumberofguidancedocuments,includingtheundergroundconstructionregulations,foundinPart1926,section800ofTitle29oftheCodeofFederalRegulations(29CFR1926.800).OSHAregulationsrelatingtoundergroundconstructionwereoriginallyadoptedin1971andrevisedovertheyearstoaddnewprotectivemeasuresandenhanceworkersafety.ThispublicationsummarizesOSHA’sregulationsrelatedtoundergroundconstruc-tion.Assuch,itshouldbeusedasaguidebutnotasasubstituteforthecompletetextof29CFR1926.800.ConstructionoperationscoveredbytheOSHAstandardTheOSHAundergroundconstructionregulation(29CFR1926.800)appliestotheconstructionofundergroundtunnels,shafts,chambers,andpassageways.Italsoappliestocut-and-coverexcavationsconnectedtoongoingundergr...