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        <ExplanationTxt>THE TRUST ESTABLISHED UNDER THE PLAN TO HOLD THE PLAN'S ASSETS RECEIVED AN EXEMPTION LETTER FROM THE INTERNAL REVENUE SERVICE (IRS) DATED OCTOBER 5, 1976, STATING THAT THE TRUST IS TAX-EXEMPT UNDER THE PROVISIONS OF SECTION 501(C)(9) OF THE INTERNAL REVENUE CODE (IRC) BUT HAS SINCE BEEN AMENDED. THERE HAVE BEEN NO FEDERAL OR STATE INCOME TAXES RECORDED IN 2020 AND 2019 FOR UNRELATED BUSINESS TAXABLE INCOME. IN ADDITION, THE PLAN AND THE TRUST ARE REQUIRED TO OPERATE IN CONFORMITY WITH THE IRC TO MAINTAIN THE TAX-EXEMPT STATUS OF THE TRUST. THE PLAN ADMINISTRATOR BELIEVES THAT THE PLAN IS BEING OPERATED IN COMPLIANCE WITH THE APPLICABLE REQUIREMENTS OF THE IRC AND, THEREFORE, BELIEVES THAT THE RELATED TRUST IS TAX-EXEMPT. ACCOUNTING PRINCIPLES GENERALLY ACCEPTED IN THE UNITED STATES OF AMERICA REQUIRE PLAN MANAGEMENT TO EVALUATE TAX POSITIONS TAKEN BY THE PLAN AND RECOGNIZE A TAX LIABILITY (OR ASSET) IF THE PLAN HAS TAKEN AN UNCERTAIN POSITION THAT MORE LIKELY THAN NOT WOULD NOT BE SUSTAINED UPON EXAMINATION BY THE IRS. THE PLAN ADMINISTRATOR HAS ANALYZED THE TAX POSITIONS TAKEN BY THE PLAN AND HAS CONCLUDED THAT AS OF DECEMBER 31, 2020, THERE ARE NO UNCERTAIN POSITIONS TAKEN OR EXPECTED TO BE TAKEN THAT WOULD REQUIRE RECOGNITION OF THE LIABILITY (OR ASSET) OR DISCLOSURE IN THE FINANCIAL STATEMENTS. THE PLAN IS SUBJECT TO ROUTINE AUDITS BY TAXING JURISDICTIONS, AND THE PLAN COULD BE SUBJECT TO INCOME TAX IF CERTAIN ISSUES WERE FOUND BY THE IRS THAT COULD RESULT IN THE DISQUALIFICATION OF THE PLAN'S TAX-EXEMPT STATUS; HOWEVER, THERE ARE CURRENTLY NO AUDITS FOR ANY TAX PERIODS IN PROGRESS.</ExplanationTxt>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
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        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>WELDIN CONSTRUCTION INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HOUSTON CONTRACTING CO</BusinessNameLine1Txt>
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        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>NORTHERN REF SERV INC</BusinessNameLine1Txt>
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        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>JACKS PLUMBING &amp; HEATING</BusinessNameLine1Txt>
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        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HONEYWELL INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>TIMBERLINE PLUMBING &amp; HEATING</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>LONG BUILDING TECHNOLOGIES INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>INTERNATIONAL MECHANICAL</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>MANTECH MECHANICAL INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>TRANE</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>H &amp; L SERVICES INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>TCI CONSTRUCTION COMPANY INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>WESTWARD SEAFOODS</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>BEHRENDS MECHANICAL</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>INSIDE PASSAGE MECHANICAL</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>PENINSULA PLUMBING</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>CENTRAL PLUMBING &amp; HEATING</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>MECHANICAL BUILDERS INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HARRI PLUMBING &amp; HEATING</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>MANTECH MECHANICAL</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>SUPERIOR PLUMBING &amp; HEATING</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>SHEET METAL INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>REFRIGERATION UNLIMITED INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>PINNACLE MECHANICAL INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>KETCHIKAN MECHANICAL INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>NORCOAST MECHANICAL</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>BERING INDUSTRIAL CONTRACTORS</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>ALASKA MECHANICAL INC</BusinessNameLine1Txt>
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        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>ARCTIC REFRIGERATION &amp; AIR CON</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>WOLF CREEK FEDERAL SERVICES</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>COOL AIR MECHANICAL INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>MECHANICAL CONSTRUCTION &amp; CONS</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>SCHMOLCK MECHANICAL</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>CONTRIBUTING EMPLOYER</PrimaryActivitiesTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>1</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>
