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    <ReturnTs>2024-03-22T06:48:27-04:00</ReturnTs>
    <TaxPeriodEndDt>2023-12-31</TaxPeriodEndDt>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2023-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>237046788</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>CONTRA COSTA REGIONAL MEDICAL CENTER AUXILIARY</BusinessNameLine1Txt>
      </BusinessName>
      <InCareOfNm>% Bill Cunningham</InCareOfNm>
      <BusinessNameControlTxt>CONT</BusinessNameControlTxt>
      <ForeignPhoneNum>9253705441</ForeignPhoneNum>
      <USAddress>
        <AddressLine1Txt>2500 ALHAMBRA AVE</AddressLine1Txt>
        <CityNm>MARTINEZ</CityNm>
        <StateAbbreviationCd>CA</StateAbbreviationCd>
        <ZIPCd>945533156</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Linda Waxman</PersonNm>
      <PersonTitleTxt>President</PersonTitleTxt>
      <SignatureDt>2024-03-22</SignatureDt>
    </BusinessOfficerGrp>
    <TaxYr>2023</TaxYr>
    <BuildTS>2023-04-26 12:10:37Z</BuildTS>
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      <GrossReceiptsAmt>31331</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <ContributionsGiftsGrantsEtcAmt>3888</ContributionsGiftsGrantsEtcAmt>
      <ProgramServiceRevenueAmt>0</ProgramServiceRevenueAmt>
      <MembershipDuesAmt>0</MembershipDuesAmt>
      <InvestmentIncomeAmt>13</InvestmentIncomeAmt>
      <SaleOfAssetsGrossAmt>0</SaleOfAssetsGrossAmt>
      <CostOrOtherBasisExpenseSaleAmt>0</CostOrOtherBasisExpenseSaleAmt>
      <GainOrLossFromSaleOfAssetsAmt>0</GainOrLossFromSaleOfAssetsAmt>
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      <SpecialEventsNetIncomeLossAmt>0</SpecialEventsNetIncomeLossAmt>
      <GrossSalesOfInventoryAmt>27430</GrossSalesOfInventoryAmt>
      <CostOfGoodsSoldAmt>15342</CostOfGoodsSoldAmt>
      <GrossProfitLossSlsOfInvntryAmt>12088</GrossProfitLossSlsOfInvntryAmt>
      <OtherRevenueTotalAmt>0</OtherRevenueTotalAmt>
      <TotalRevenueAmt>15989</TotalRevenueAmt>
      <GrantsAndSimilarAmountsPaidAmt>7011</GrantsAndSimilarAmountsPaidAmt>
      <BenefitsPaidToOrForMembersAmt>1498</BenefitsPaidToOrForMembersAmt>
      <SalariesOtherCompEmplBnftAmt>0</SalariesOtherCompEmplBnftAmt>
      <FeesAndOtherPymtToIndCntrctAmt>4260</FeesAndOtherPymtToIndCntrctAmt>
      <OccupancyRentUtltsAndMaintAmt>0</OccupancyRentUtltsAndMaintAmt>
      <PrintingPublicationsPostageAmt>0</PrintingPublicationsPostageAmt>
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      <TotalExpensesAmt>15146</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>843</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>131867</NetAssetsOrFundBalancesBOYAmt>
      <OtherChangesInNetAssetsAmt>342</OtherChangesInNetAssetsAmt>
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      <InfoInScheduleOPartIIInd>X</InfoInScheduleOPartIIInd>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>86378</BOYAmt>
        <EOYAmt>78868</EOYAmt>
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      <LandAndBuildingsGrp>
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        <EOYAmt>0</EOYAmt>
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      <OtherAssetsTotalDetail>
        <BOYAmt>46055</BOYAmt>
        <EOYAmt>54748</EOYAmt>
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      <Form990TotalAssetsGrp>
        <BOYAmt>132433</BOYAmt>
        <EOYAmt>133616</EOYAmt>
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      <SumOfTotalLiabilitiesGrp>
        <BOYAmt>566</BOYAmt>
        <EOYAmt>564</EOYAmt>
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        <BOYAmt>131867</BOYAmt>
        <EOYAmt>133052</EOYAmt>
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      <PrimaryExemptPurposeTxt>THE CONTRA COSTA REGIONAL MEDICAL CENTER AUXILIARY'S PURPOSE IS TO PROVIDE SERVICE AND FUNDS FOR SPECIAL PROJECTS WITHIN THE COUNTY HOSPITAL SYSTEM THAT OTHERWISE ARE NOT FUNDED. WITH THE PRIMARY EMPHASIS ON INFANTS AND THE MOST UNDERSERVED IN OUR COMMUNITY.</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>Layette</DescriptionProgramSrvcAccomTxt>
        <GrantsAndAllocationsAmt>0</GrantsAndAllocationsAmt>
        <ProgramServiceExpensesAmt>4396</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>Fish Tank 1800 and Holiday Decor 212</DescriptionProgramSrvcAccomTxt>
        <GrantsAndAllocationsAmt>0</GrantsAndAllocationsAmt>
        <ProgramServiceExpensesAmt>2012</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>Pastoral Care 132 Cancer Program 471</DescriptionProgramSrvcAccomTxt>
        <GrantsAndAllocationsAmt>0</GrantsAndAllocationsAmt>
        <ProgramServiceExpensesAmt>603</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <TotalProgramServiceExpensesAmt>7011</TotalProgramServiceExpensesAmt>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentName="CompensationExplanation">Linda Waxman</PersonNm>
        <TitleTxt>President</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>5</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentName="CompensationExplanation">Eileen Devlin</PersonNm>
        <TitleTxt>Secretary</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentName="CompensationExplanation">Skip Weinstock</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>4</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentName="CompensationExplanation">Betty Holt</PersonNm>
        <TitleTxt>Assistant Treasurer</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentName="CompensationExplanation">Linda Waxman</PersonNm>
        <TitleTxt>Gift Shop Manager</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>35</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentName="CompensationExplanation">Susan Tunison</PersonNm>
        <TitleTxt>Historian</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentName="CompensationExplanation">Florence Berghius</PersonNm>
        <TitleTxt>Parliamentarian</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentName="CompensationExplanation">Pat Harris</PersonNm>
        <TitleTxt>Sunshine</TitleTxt>
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        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
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      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentName="CompensationExplanation">Ed Quinnan</PersonNm>
        <TitleTxt>Member at Large</TitleTxt>
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        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
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      <DirectIndirectPltclExpendAmt>0</DirectIndirectPltclExpendAmt>
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      <EngagedInExcessBenefitTransInd referenceDocumentName="IRS990ScheduleL">false</EngagedInExcessBenefitTransInd>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <BooksInCareOfDetail>
        <PersonNm>Susan L Linnell</PersonNm>
        <USAddress>
          <AddressLine1Txt>7517 S Quinn Ct</AddressLine1Txt>
          <CityNm>Gilbert</CityNm>
          <StateAbbreviationCd>AZ</StateAbbreviationCd>
          <ZIPCd>852980058</ZIPCd>
        </USAddress>
        <PhoneNum>5105013755</PhoneNum>
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      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <DonorAdvisedFndsInd>false</DonorAdvisedFndsInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <TanningServicesProvidedInd>false</TanningServicesProvidedInd>
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      <PartVIHghstPdCntrctProfSrvcTxt>NONE</PartVIHghstPdCntrctProfSrvcTxt>
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      <HospitalInd>X</HospitalInd>
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    <IRS990ScheduleO documentId="IRS990ScheduleO1" documentName="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, line 8</FormAndLineReferenceDesc>
        <ExplanationTxt>| Other Revenues:, Amount:| Other Revenue, $0|</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, line 10</FormAndLineReferenceDesc>
        <ExplanationTxt>| Grants And Similar Amounts Paid:, Amount:| Layette: Provides layettes for new babies born at CCRMC. The vast majority of this population is in the lowest income bracket and these layettes provide a great benefit to the families., $4396| Fish Tank: The fish tank is for the intensive care unit. The fish tank provides emotional therapy to patients and families at CCRMC., $1800| Pastoral Care: Pastoral Care offers support to families and patients at CCRMC., $132| Holiday Decor: Holiday Decor provides comfort to patients and families at CCRMC., $212| Cancer: The Cancer Program provides support to patients and families at CCRMC., $471|</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>| Other Expenses:, Amount:| Equipment rental and maintenance, $91| Equipment, $565| Merchant Fees, $959| Office Supplies, $762|</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, line 20</FormAndLineReferenceDesc>
        <ExplanationTxt>| Explanation:, Amount:| Adjustment to physical inventory., $342|</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II, line 24</FormAndLineReferenceDesc>
        <ExplanationTxt>| Explanation:, BOYAmount:, EOYAmount:| OTHER ASSETS. GIFT SHOP INVENTORY., $46055, $54748|</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II, line 26</FormAndLineReferenceDesc>
        <ExplanationTxt>| Explanation:, BOYAmount:, EOYAmount:| LIABILITIES. SALES TAX PAYABLE, $566, $564|</ExplanationTxt>
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