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  <xs:element id="mtz_EffectiveIncomeTaxRateReconciliationGoodwillAndIntangibleAssets" abstract="false" name="EffectiveIncomeTaxRateReconciliationGoodwillAndIntangibleAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
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  <xs:element id="mtz_IBEWLocal1249PensionPlanMember" abstract="true" name="IBEWLocal1249PensionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="mtz_DebtInstrumentOwnershipPercentage" abstract="false" name="DebtInstrumentOwnershipPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
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  <xs:element id="mtz_SanDiegoCountyConstructionLaborersPensionTrustFundMember" abstract="true" name="SanDiegoCountyConstructionLaborersPensionTrustFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="mtz_NumberOfYearsOfDiscountedCashFlowsMember" abstract="true" name="NumberOfYearsOfDiscountedCashFlowsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="mtz_HeavyGeneralLaborersLocalUnions472And172OfNewJerseyPensionFundMember" abstract="true" name="HeavyGeneralLaborersLocalUnions472And172OfNewJerseyPensionFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="mtz_LaborersDistrictCouncilofWPAPensionFundMember" abstract="true" name="LaborersDistrictCouncilofWPAPensionFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
