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  <xsd:element name="LossContingencyInsurancePolicyDeductibleForEachLineOfCoverage" id="myrg_LossContingencyInsurancePolicyDeductibleForEachLineOfCoverage" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="LossContingencyInsurancePolicyDeductibleIfClaimAggregateReachedPerLineOfCoverage" id="myrg_LossContingencyInsurancePolicyDeductibleIfClaimAggregateReachedPerLineOfCoverage" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="LossContingencyHealthInsuranceDeductibleForQualifiedIndividuals" id="myrg_LossContingencyHealthInsuranceDeductibleForQualifiedIndividuals" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="PurchaseCommitmentsAbstract" id="myrg_PurchaseCommitmentsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeesMember" id="myrg_EmployeesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermIncentivePlan2007Member" id="myrg_LongTermIncentivePlan2007Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans" id="myrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TransmissionAndDistributionMember" id="myrg_TransmissionAndDistributionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommercialAndIndustrialMember" id="myrg_CommercialAndIndustrialMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfMultiemployerPlansWithdrawalThatCouldResultInAssessmentOfAdditionalContributionLiabilitiesRelatedToUnderfundingOfPlansMinimum" id="myrg_NumberOfMultiemployerPlansWithdrawalThatCouldResultInAssessmentOfAdditionalContributionLiabilitiesRelatedToUnderfundingOfPlansMinimum" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PotentialAdverseOutcomeNumberOfLitigationClaimsMinimum" id="myrg_PotentialAdverseOutcomeNumberOfLitigationClaimsMinimum" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SignificantPurchaseCommitmentScheduledPeriodOfTimeForCashOutlay" id="myrg_SignificantPurchaseCommitmentScheduledPeriodOfTimeForCashOutlay" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InsurancePolicyTextBlock" id="myrg_InsurancePolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumWarrantyPeriod" id="myrg_MaximumWarrantyPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccountsReceivableMaximumCollectionPeriodOfMajorityOfCustomerBalances" id="myrg_AccountsReceivableMaximumCollectionPeriodOfMajorityOfCustomerBalances" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MinimumTermOfSomeLargerContracts" id="myrg_MinimumTermOfSomeLargerContracts" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumPeriodForSettlementOfMajorityOfBalancesUnderConstructionContract" id="myrg_MaximumPeriodForSettlementOfMajorityOfBalancesUnderConstructionContract" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassificationOfConstructionContractAbstract" id="myrg_ClassificationOfConstructionContractAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BuildingBuildingImprovementsAndLandImprovementsMember" id="myrg_BuildingBuildingImprovementsAndLandImprovementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConstructionEquipmentMember" id="myrg_ConstructionEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InsurancePoliciesTable" id="myrg_InsurancePoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InsurancePoliciesLineItems" id="myrg_InsurancePoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InsurancePoliciesDeductiblePerClaimForEachLineOfCoverage" id="myrg_InsurancePoliciesDeductiblePerClaimForEachLineOfCoverage" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="InsurancePoliciesDeductibleIfClaimAggregateReachesPerLineOfCoverage" id="myrg_InsurancePoliciesDeductibleIfClaimAggregateReachesPerLineOfCoverage" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="HealthInsuranceDeductibleForQualifiedIndividuals" id="myrg_HealthInsuranceDeductibleForQualifiedIndividuals" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="OneLargestCustomerMember" id="myrg_OneLargestCustomerMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TwoLargestCustomerMember" id="myrg_TwoLargestCustomerMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TenLargestCustomerMember" id="myrg_TenLargestCustomerMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DominionResourcesIncMember" id="myrg_DominionResourcesIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NationalGridMember" id="myrg_NationalGridMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfCustomersIndividuallyExceeding10PercentConsolidatedAccountsReceivable" id="myrg_NumberOfCustomersIndividuallyExceeding10PercentConsolidatedAccountsReceivable" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfRollForwardActivityOfAllowanceForDoubtfulAccountsTableTextBlock" id="myrg_ScheduleOfRollForwardActivityOfAllowanceForDoubtfulAccountsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IntangibleAssetsGrossIncludingGoodwill" id="myrg_IntangibleAssetsGrossIncludingGoodwill" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DefinedContributionPlansDomain" id="myrg_DefinedContributionPlansDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProfitSharingAndThriftEmployeeBenefitPlanMember" id="myrg_ProfitSharingAndThriftEmployeeBenefitPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeeBenefitPlanMember" id="myrg_EmployeeBenefitPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DefinedContributionPlansLineItems" id="myrg_DefinedContributionPlansLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NationalElectricalAnnuityPlanMember" id="myrg_NationalElectricalAnnuityPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EighthDistrictElectricalPensionFundAnnuityPlanMember" id="myrg_EighthDistrictElectricalPensionFundAnnuityPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NationalElectricalBenefitFundMember" id="myrg_NationalElectricalBenefitFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EighthDistrictElectricalPensionFundMember" id="myrg_EighthDistrictElectricalPensionFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IBEWLocal1249PensionPlanMember" id="myrg_IBEWLocal1249PensionPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfLocalsCoveredUnderMultiemployerDefinedPlans" id="myrg_NumberOfLocalsCoveredUnderMultiemployerDefinedPlans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MultiemployerPlansRedZoneFundedStatusPercentage" id="myrg_MultiemployerPlansRedZoneFundedStatusPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MultiemployerPlansYellowZoneFundedStatusPercentage" id="myrg_MultiemployerPlansYellowZoneFundedStatusPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MultiemployerPlansGreenZoneFundedStatusPercentage" id="myrg_MultiemployerPlansGreenZoneFundedStatusPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MinimumExtendedPeriodOfContractingCycleForLongTermContracts" id="myrg_MinimumExtendedPeriodOfContractingCycleForLongTermContracts" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MinimumExtendedPeriodForCollectionOfRetainageOnCertainLongTermContracts" id="myrg_MinimumExtendedPeriodForCollectionOfRetainageOnCertainLongTermContracts" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfCustomersIndividuallyExceeding10PercentOfConsolidatedContractRevenue" id="myrg_NumberOfCustomersIndividuallyExceeding10PercentOfConsolidatedContractRevenue" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfRetainageRecordedAndCollected" id="myrg_PercentageOfRetainageRecordedAndCollected" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateLeaseTerm" id="myrg_RealEstateLeaseTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCovenantLeveragedDebtRatio" id="myrg_DebtInstrumentCovenantLeveragedDebtRatio" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCovenantInterestCoverageRatio" id="myrg_DebtInstrumentCovenantInterestCoverageRatio" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VolatilityPeriodOverWhichCommonStockPubliclyTraded" id="myrg_VolatilityPeriodOverWhichCommonStockPubliclyTraded" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfSegmentReportingInformationRelatedToAllocationOfDepreciationAndAmortizationBySegmentTextBlock" id="myrg_ScheduleOfSegmentReportingInformationRelatedToAllocationOfDepreciationAndAmortizationBySegmentTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccruedPayrollAndIncentiveCompensationCurrent" id="myrg_AccruedPayrollAndIncentiveCompensationCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="AccruedUnionDuesAndBenefits" id="myrg_AccruedUnionDuesAndBenefits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="OutstandingPerformanceBonds" id="myrg_OutstandingPerformanceBonds" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="EstimatedCostToCompleteBondedProjects" id="myrg_EstimatedCostToCompleteBondedProjects" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="MultiemployerPlansMinimumContributionAsPercentOfWages" id="myrg_MultiemployerPlansMinimumContributionAsPercentOfWages" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="CostEstimateRevisionGrossMarginIncreasePercentage" id="myrg_CostEstimateRevisionGrossMarginIncreasePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LEMyersCoMember" id="myrg_LEMyersCoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VehicularTrafficAccidentCaseMember" id="myrg_VehicularTrafficAccidentCaseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyPunitiveDamagesAwardedValue" id="myrg_LossContingencyPunitiveDamagesAwardedValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyMaximumMultipleOfCompensatoryDamagesForEstimatedPunitiveDamagesThatCanBeSought" id="myrg_LossContingencyMaximumMultipleOfCompensatoryDamagesForEstimatedPunitiveDamagesThatCanBeSought" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
</xsd:schema>





