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  <xs:element id="hsc_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExercisedinPeriodWeightedAverageExercisePrice" abstract="false" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExercisedinPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="hsc_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositionsNet" abstract="false" name="UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositionsNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="hsc_WasteProcessingAndReuseSolutionsMember" abstract="true" name="WasteProcessingAndReuseSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hsc_Differencesoninternationalearningsandremittances" abstract="false" name="Differencesoninternationalearningsandremittances" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
