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  <xsd:element name="AmortizationOfDebtPremium" id="cwst_AmortizationOfDebtPremium" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AmortizationOfDebtDiscount" id="cwst_AmortizationOfDebtDiscount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInPrepaidDeferredExpenseInventoryAndOtherAssets" id="cwst_IncreaseDecreaseInPrepaidDeferredExpenseInventoryAndOtherAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsToAcquirePropertyPlantAndEquipmentAcquisition" id="cwst_PaymentsToAcquirePropertyPlantAndEquipmentAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsToAcquirePropertyPlantAndEquipmentGrowth" id="cwst_PaymentsToAcquirePropertyPlantAndEquipmentGrowth" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsToAcquirePropertyPlantAndEquipmentMaintainence" id="cwst_PaymentsToAcquirePropertyPlantAndEquipmentMaintainence" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsToAcquireGasRights" id="cwst_PaymentsToAcquireGasRights" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromMinorityShareholdersOther" id="cwst_ProceedsFromMinorityShareholdersOther" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CashPaidReceivedDuringPeriodAbstract" id="cwst_CashPaidReceivedDuringPeriodAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NotesReceivableExchangedInAcquisition" id="cwst_NotesReceivableExchangedInAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" id="cwst_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AbandonedDevelopmentProjectExpenseAbstract" id="cwst_AbandonedDevelopmentProjectExpenseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AbandonedDevelopmentProjectExpenseTextBlock" id="cwst_AbandonedDevelopmentProjectExpenseTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubsidiaryGuarantorsDisclosureAbstract" id="cwst_SubsidiaryGuarantorsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubsidiaryGuarantorsDisclosureTextBlock" id="cwst_SubsidiaryGuarantorsDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReclassificationDisclosureAbstract" id="cwst_ReclassificationDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReclassificationTextBlock" id="cwst_ReclassificationTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ComprehensiveIncomeAndDerivativeInstrumentsAndHedgingActivitiesNoteTextBlock" id="cwst_ComprehensiveIncomeAndDerivativeInstrumentsAndHedgingActivitiesNoteTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NotesPayableLiabilitiesAssumedAndHoldbacksToSellers" id="cwst_NotesPayableLiabilitiesAssumedAndHoldbacksToSellers" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="MinorityInterestIncreaseFromContribution" id="cwst_MinorityInterestIncreaseFromContribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsForLandfillOperatingLease" id="cwst_PaymentsForLandfillOperatingLease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
</xsd:schema>





