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  <xs:element id="fstr_NumberOfPotentiallyResponsiblePartiesIncludedInAgreement" abstract="false" name="NumberOfPotentiallyResponsiblePartiesIncludedInAgreement" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fstr_NumberOfPostRetirementBenefitPlan" abstract="false" name="NumberOfPostRetirementBenefitPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fstr_OtherPrecastConcreteProductsMember" abstract="true" name="OtherPrecastConcreteProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fstr_DefinedContributionPlanNumber" abstract="false" name="DefinedContributionPlanNumber" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fstr_LineOfCreditFacilityMaximumIncreaseInCommitments" abstract="false" name="LineOfCreditFacilityMaximumIncreaseInCommitments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_NumberOfRetirementPlans" abstract="false" name="NumberOfRetirementPlans" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="fstr_PNCBankNACitizensBankNAWellsFargoBankNationalAssociationBankOfAmericaNAAndBMOHarrisBankNationalAssociationMember" abstract="true" name="PNCBankNACitizensBankNAWellsFargoBankNationalAssociationBankOfAmericaNAAndBMOHarrisBankNationalAssociationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fstr_CorporateExpenseAndOtherUnallocatedCharges" abstract="false" name="CorporateExpenseAndOtherUnallocatedCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_AcquisitionConsiderationThreshold" abstract="false" name="AcquisitionConsiderationThreshold" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_Swap2Member" abstract="true" name="Swap2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fstr_LitigationSettlementAmountAwardedToOtherPartyCurrent" abstract="false" name="LitigationSettlementAmountAwardedToOtherPartyCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_LongtermPurchaseCommitmentAnnualCommitmentAmount" abstract="false" name="LongtermPurchaseCommitmentAnnualCommitmentAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredReceiptPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredReceiptPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
</xs:schema>
