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  <xsd:element name="DebtInstrumentVariableRateBaseEurodollarRateMember" id="acm_DebtInstrumentVariableRateBaseEurodollarRateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DebtInstrumentVariableRateBaseFederalFundsRateMember" id="acm_DebtInstrumentVariableRateBaseFederalFundsRateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DebtInstrumentVariableRateBaseLIBORMember" id="acm_DebtInstrumentVariableRateBaseLIBORMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear" id="acm_DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element name="DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalFirstFullFiscalYear" id="acm_DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalFirstFullFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element name="DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalSecondFullFiscalYear" id="acm_DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalSecondFullFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element name="DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalThirdFullFiscalYear" id="acm_DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalThirdFullFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element name="DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalFourthFullFiscalYear" id="acm_DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalFourthFullFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element name="DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterFourthFullFiscalYear" id="acm_DebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterFourthFullFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element name="DebtInstrumentBasisSpreadOnVariableRateLowEndOfRange" id="acm_DebtInstrumentBasisSpreadOnVariableRateLowEndOfRange" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DebtInstrumentBasisSpreadOnVariableRateHighEndOfRange" id="acm_DebtInstrumentBasisSpreadOnVariableRateHighEndOfRange" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="FederalIncomeTaxRateForeignEarningsRepatriatedUnderAmericanJobsCreationAct" id="acm_FederalIncomeTaxRateForeignEarningsRepatriatedUnderAmericanJobsCreationAct" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="DebtInstrumentTerm" id="acm_DebtInstrumentTerm" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DebtInstrumentNumberOfSubsidiaryBorrowers" id="acm_DebtInstrumentNumberOfSubsidiaryBorrowers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DebtInstrumentNumberOfSubsidiaryGuarantors" id="acm_DebtInstrumentNumberOfSubsidiaryGuarantors" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DebtInstrumentNumberOfSubsidiaryGuaranteesMinimum" id="acm_DebtInstrumentNumberOfSubsidiaryGuaranteesMinimum" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="LineOfCreditFacilityUnusedCapacityCommitmentFeePercentageLowEndOfRange" id="acm_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentageLowEndOfRange" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="LineOfCreditFacilityUnusedCapacityCommitmentFeePercentageHighEndOfRange" id="acm_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentageHighEndOfRange" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DebtInstrumentAdditionalBorrowingAmount" id="acm_DebtInstrumentAdditionalBorrowingAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod" id="acm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="IncomeTaxCreditsAndAdjustmentsFromExtensionOfElapsedResearchAndExperimentationCredits" id="acm_IncomeTaxCreditsAndAdjustmentsFromExtensionOfElapsedResearchAndExperimentationCredits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element name="LineOfCreditFacilityInterestRateDuringPeriodNetOfInterestRateSwap" id="acm_LineOfCreditFacilityInterestRateDuringPeriodNetOfInterestRateSwap" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="OtherDebtMember" id="acm_OtherDebtMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="AssetsHeldInTrustCurrentNet" id="acm_AssetsHeldInTrustCurrentNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element name="BusinessDisruptionNetExpense" id="acm_BusinessDisruptionNetExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element name="ProjectLiabilities" id="acm_ProjectLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element name="DebtInstrumentCovenantActualConsolidatedLeverageRatio" id="acm_DebtInstrumentCovenantActualConsolidatedLeverageRatio" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DebtInstrumentCovenantMaximumConsolidatedLeverageRatio" id="acm_DebtInstrumentCovenantMaximumConsolidatedLeverageRatio" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DebtInstrumentCovenantMinimumNetWorthThresholdBaseAmount" id="acm_DebtInstrumentCovenantMinimumNetWorthThresholdBaseAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element name="DebtInstrumentCovenantMinimumNetWorthThresholdPercentageOfConsolidatedNetIncomeForEachFiscalQuarterCommencingWithSpecifiedPeriod" id="acm_DebtInstrumentCovenantMinimumNetWorthThresholdPercentageOfConsolidatedNetIncomeForEachFiscalQuarterCommencingWithSpecifiedPeriod" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="DebtInstrumentCovenantMinimumNetWorthThreshold" id="acm_DebtInstrumentCovenantMinimumNetWorthThreshold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element name="ExpectedPeriodForAppealProcessConclusionMaximum" id="acm_ExpectedPeriodForAppealProcessConclusionMaximum" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="DebtInstrumentCouponRateStatedPercentage" id="acm_DebtInstrumentCouponRateStatedPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="DebtInstrumentEffectiveInterestRatePercentage" id="acm_DebtInstrumentEffectiveInterestRatePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant"/>
</xsd:schema>
</XBRL>
