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<!-- Copyright (c) 2005-2013 R.R. Donnelley & Sons Company All Rights Reserved. -->
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  <element name="IntercompanyBorrowings" id="cwst_IntercompanyBorrowings" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntercompanyReceivable" id="cwst_IntercompanyReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestCoverageMinimumRatio" id="cwst_InterestCoverageMinimumRatio" type="xbrli:pureItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentInSubsidiaries" id="cwst_InvestmentInSubsidiaries" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaineEnergyFacilityMember" id="cwst_MaineEnergyFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaintenanceMember" id="cwst_MaintenanceMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumDebtToEbitdaRatio" id="cwst_MaximumDebtToEbitdaRatio" type="xbrli:pureItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumSeniorFundedDebtToAdjustedEbitdaRatio" id="cwst_MaximumSeniorFundedDebtToAdjustedEbitdaRatio" type="xbrli:pureItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MinorityInterestIncreaseFromContributions" id="cwst_MinorityInterestIncreaseFromContributions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MotorsLiquidationTrustMember" id="cwst_MotorsLiquidationTrustMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NotesDue2019Member" id="cwst_NotesDue2019Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumeratorAbstract" id="cwst_NumeratorAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OrganicsMember" id="cwst_OrganicsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherRegionMember" id="cwst_OtherRegionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsForCapitalExpenditureOnDivestitureOfBusiness" id="cwst_PaymentsForCapitalExpenditureOnDivestitureOfBusiness" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsForLandfillOperatingLease" id="cwst_PaymentsForLandfillOperatingLease" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsToAcquireBusinessesGrossNetOfCashAcquired" id="cwst_PaymentsToAcquireBusinessesGrossNetOfCashAcquired" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOrAdditionalPercentageOfEstimatedRemediationCosts" id="cwst_PercentageOrAdditionalPercentageOfEstimatedRemediationCosts" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PerformanceShareUnitsMember" id="cwst_PerformanceShareUnitsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PerformanceStockUnitMember" id="cwst_PerformanceStockUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PeriodOverWhichConsiderationForSaleOfDisposalGroupAssetsToBeReceived" id="cwst_PeriodOverWhichConsiderationForSaleOfDisposalGroupAssetsToBeReceived" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PotsdamEnvironmentalLiabilityMember" id="cwst_PotsdamEnvironmentalLiabilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PowerGenerationMember" id="cwst_PowerGenerationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProceedsPercentageFromSaleOfEquityMethodInvestments" id="cwst_ProceedsPercentageFromSaleOfEquityMethodInvestments" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProcessingMember" id="cwst_ProcessingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProformaDebtInstrumentLineItems" id="cwst_ProformaDebtInstrumentLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RecyclingMember" id="cwst_RecyclingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestrictedStockAndRestrictedStockUnitMember" id="cwst_RestrictedStockAndRestrictedStockUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestrictedStockRestrictedStockUnitsAndPerformanceStockUnitsMember" id="cwst_RestrictedStockRestrictedStockUnitsAndPerformanceStockUnitsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfCondensedComprehensiveIncomeLossTableTextBlock" id="cwst_ScheduleOfCondensedComprehensiveIncomeLossTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfInvestmentsInUnconsolidatedSubsidiariesTableTextBlock" id="cwst_ScheduleOfInvestmentsInUnconsolidatedSubsidiariesTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfRestrictedStockRestrictedStockUnitAndPerformanceStockUnitActivityLineItems" id="cwst_ScheduleOfRestrictedStockRestrictedStockUnitAndPerformanceStockUnitActivityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfRestrictedStockRestrictedStockUnitAndPerformanceStockUnitActivityTable" id="cwst_ScheduleOfRestrictedStockRestrictedStockUnitAndPerformanceStockUnitActivityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScrapYardAndSolidWasteTransferStation" id="cwst_ScrapYardAndSolidWasteTransferStation" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SecondLienNotesMember" id="cwst_SecondLienNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorSecuredRevolvingCreditFacilityMember" id="cwst_SeniorSecuredRevolvingCreditFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SolidWasteOperationsMember" id="cwst_SolidWasteOperationsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SouthbridgeLandfillMember" id="cwst_SouthbridgeLandfillMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockholdersEquityExcludingPortionAttributableToSubsidiariesNoncontrollingInterestAbstract" id="cwst_StockholdersEquityExcludingPortionAttributableToSubsidiariesNoncontrollingInterestAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockOptionsPerformanceStockUnitsRestrictedStockUnitsAndRestrictedStockMember" id="cwst_StockOptionsPerformanceStockUnitsRestrictedStockUnitsAndRestrictedStockMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TenderPremiumAndTenderFeesMember" id="cwst_TenderPremiumAndTenderFeesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TompkinsCountyRecyclingLlcMember" id="cwst_TompkinsCountyRecyclingLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandSixStockIncentivePlanMember" id="cwst_TwoThousandSixStockIncentivePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UndiscountedCostsPreferredRemedies" id="cwst_UndiscountedCostsPreferredRemedies" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WasteStreamIncMember" id="cwst_WasteStreamIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageNumberOfCommonSharesOutstandingAbstract" id="cwst_WeightedAverageNumberOfCommonSharesOutstandingAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WesternMember" id="cwst_WesternMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WesternRegionMember" id="cwst_WesternRegionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WriteOffDebtDiscount" id="cwst_WriteOffDebtDiscount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WriteOffDeferredFinancingCostsMember" id="cwst_WriteOffDeferredFinancingCostsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WriteOffUnamortizedOriginalIssueDiscountMember" id="cwst_WriteOffUnamortizedOriginalIssueDiscountMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>





