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        <RelatedOrExemptFuncIncomeAmt>234720</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>MEMBERSHIP INCOME</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>22800</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>257520</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>15</TotalRevenueColumnAmt>
        <ExclusionAmt>15</ExclusionAmt>
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        <ExclusionAmt>15</ExclusionAmt>
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      <GrantsToDomesticOrgsGrp>
        <TotalAmt>115929</TotalAmt>
        <ProgramServicesAmt>115929</ProgramServicesAmt>
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        <ProgramServicesAmt>163202</ProgramServicesAmt>
        <ManagementAndGeneralAmt>10417</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>238797</ManagementAndGeneralAmt>
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      <OtherEmployeeBenefitsGrp>
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        <ProgramServicesAmt>401815</ProgramServicesAmt>
        <ManagementAndGeneralAmt>570124</ManagementAndGeneralAmt>
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      <PayrollTaxesGrp>
        <TotalAmt>81408</TotalAmt>
        <ProgramServicesAmt>81408</ProgramServicesAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>354</TotalAmt>
        <ManagementAndGeneralAmt>354</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>11728</TotalAmt>
        <ManagementAndGeneralAmt>11728</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>145180</TotalAmt>
        <ProgramServicesAmt>139503</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5677</ManagementAndGeneralAmt>
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      <OfficeExpensesGrp>
        <TotalAmt>75138</TotalAmt>
        <ProgramServicesAmt>49161</ProgramServicesAmt>
        <ManagementAndGeneralAmt>25977</ManagementAndGeneralAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>106428</TotalAmt>
        <ProgramServicesAmt>101312</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5116</ManagementAndGeneralAmt>
      </InformationTechnologyGrp>
      <OccupancyGrp>
        <TotalAmt>213867</TotalAmt>
        <ManagementAndGeneralAmt>213867</ManagementAndGeneralAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>458581</TotalAmt>
        <ProgramServicesAmt>454881</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3700</ManagementAndGeneralAmt>
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      <ConferencesMeetingsGrp>
        <TotalAmt>136097</TotalAmt>
        <ProgramServicesAmt>136097</ProgramServicesAmt>
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      <DepreciationDepletionGrp>
        <TotalAmt>6706</TotalAmt>
        <ManagementAndGeneralAmt>6706</ManagementAndGeneralAmt>
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      <InsuranceGrp>
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        <ProgramServicesAmt>2008</ProgramServicesAmt>
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        <ProgramServicesAmt>2551745</ProgramServicesAmt>
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        <EOYAmt>60486</EOYAmt>
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        <EOYAmt>325136</EOYAmt>
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        <EOYAmt>332577</EOYAmt>
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        <EOYAmt>1387810</EOYAmt>
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        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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        <CurrentTaxYearMinus1YearAmt>3349575</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>3536301</CurrentTaxYearAmt>
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      <TotalCalendarYear170Grp>
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        <CurrentTaxYearMinus1YearAmt>3349575</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>3536301</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus3YearsAmt>20</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>6023</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>7450</CurrentTaxYearMinus1YearAmt>
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      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
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    <IRS990ScheduleB documentId="RetDoc1234500001">
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        <ContributorBusinessName>
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        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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        <BookValueAmt>6261</BookValueAmt>
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      <TotalBookValueLandBuildingsAmt>19030</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED COMPENSATION OBLIGATION</Desc>
        <Amt>325136</Amt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>GRANT PAYABLE</Desc>
        <Amt>188737</Amt>
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      <TotalLiabilityAmt>513873</TotalLiabilityAmt>
      <TotalRevEtcAuditedFinclStmtAmt>3696088</TotalRevEtcAuditedFinclStmtAmt>
      <RevenueNotReportedAmt>0</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>3696088</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>3696088</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>3644208</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>3644208</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>3644208</TotalExpensesPerForm990Amt>
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    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>0</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>FRANKLIN W OLIN COLLEGE OF ENGINEERING INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1000 OLIN WAY</AddressLine1Txt>
          <CityNm>NEEDHAM</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02492</ZIPCd>
        </USAddress>
        <RecipientEIN>061519057</RecipientEIN>
        <IRCSectionDesc>501C3</IRCSectionDesc>
        <PurposeOfGrantTxt>RESEARCH SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>TUFTS UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>20 PROFESSORS ROW</AddressLine1Txt>
          <CityNm>MEDFORD</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02155</ZIPCd>
        </USAddress>
        <RecipientEIN>042103634</RecipientEIN>
        <IRCSectionDesc>501C3</IRCSectionDesc>
        <CashGrantAmt>21541</CashGrantAmt>
        <PurposeOfGrantTxt>RESEARCH SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>UNIVERSITY OF ALABAMA</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>807 UNIVERSITY BLVD</AddressLine1Txt>
          <CityNm>TUSCALOOSA</CityNm>
          <StateAbbreviationCd>AL</StateAbbreviationCd>
          <ZIPCd>35487</ZIPCd>
        </USAddress>
        <RecipientEIN>636001138</RecipientEIN>
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        <CashGrantAmt>27160</CashGrantAmt>
        <PurposeOfGrantTxt>RESEARCH SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>104 AIRPORT DRIVE SUITE 2200</AddressLine1Txt>
          <CityNm>CHAPEL HILL</CityNm>
          <StateAbbreviationCd>NC</StateAbbreviationCd>
          <ZIPCd>27599</ZIPCd>
        </USAddress>
        <RecipientEIN>566001393</RecipientEIN>
        <IRCSectionDesc>501C3</IRCSectionDesc>
        <CashGrantAmt>14122</CashGrantAmt>
        <PurposeOfGrantTxt>RESEARCH SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>BRIGHAM YOUNG UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>B-307 ASB PO BOX 21128</AddressLine1Txt>
          <CityNm>PROVO</CityNm>
          <StateAbbreviationCd>UT</StateAbbreviationCd>
          <ZIPCd>84602</ZIPCd>
        </USAddress>
        <RecipientEIN>870217280</RecipientEIN>
        <IRCSectionDesc>501C3</IRCSectionDesc>
        <CashGrantAmt>42535</CashGrantAmt>
        <PurposeOfGrantTxt>RESEARCH SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>UNIVERSITY OF PENNSYLVANIA</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>3160 CHESNUT STREET SUITE 500</AddressLine1Txt>
          <CityNm>PHILADELPHIA</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19104</ZIPCd>
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        <RecipientEIN>231352685</RecipientEIN>
        <IRCSectionDesc>501C3</IRCSectionDesc>
        <CashGrantAmt>10570</CashGrantAmt>
        <PurposeOfGrantTxt>RESEARCH SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>OREGON STATE UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1500 SW JEFFERSON WAY</AddressLine1Txt>
          <CityNm>CORVALLIS</CityNm>
          <StateAbbreviationCd>OR</StateAbbreviationCd>
          <ZIPCd>97331</ZIPCd>
        </USAddress>
        <RecipientEIN>963022772</RecipientEIN>
        <IRCSectionDesc>501C3</IRCSectionDesc>
        <PurposeOfGrantTxt>RESEARCH SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART 1, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>POTENTIAL GRANT RECIPIENTS ARE REFERRED TO CUAHSI BY THE FEDERAL GOVERNMENT (NATIONAL SCIENCE FOUNDATION), OR IN RESPONSE TO PUBLIC SOLICITATIONS, OR MAY BE RECEIVED UNSOLICITED. SCIENTIFIC ELIGIBILITY IS DETERMINED BY AN INDEPENDENT PANEL OF SCIENTISTS. FINANCIAL/ADMINISTRATIVE ELIGIBILITY IS DETERMINED BY CUAHSI STAFF VIA REVIEW OF FINANCIAL REPORTS, PROPOSED BUDGETS, INQUIRIES AND SITE VISITS AS APPROPRIATE. "DURING THE AWARD PROCEDURES INCLUDE AN ESTALISHED PROTOCOL REQUIRING GENERAL LEDGE DETAIL AND BUDGET TO ACTUAL REPORTS TO ACCOMPANY ALL REIMBURSEMENT REQUESTS, WITH ADDITIONAL DOCUMENTATION OR SITE VISITS AS DEEMED APPROPRIATE, AS WELL AS PERIODIC PERFORMANCE REPORTS AND ANNUAL AUDIT REPORTS, INCLUDING TIMELY AND APPROPRIATE RESPONSES TO ALL AUDIT FINDINGS.</ExplanationTxt>
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    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
      <WrittenEmploymentContractInd>X</WrittenEmploymentContractInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
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        <PersonNm>JERAD D BALES</PersonNm>
        <TitleTxt>PRESIDENT, EXECUTIVE DIREC</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>174807</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>AN EXECUTIVE COMPENSATION COMMITTEE COMPRISED OF OFFICER AND DIRECTORS REVIEWS AND DETERMINES THE EXECUTIVE DIRECTOR'S PERFORMANCE AND SALARY ON AN ANNUAL BASIS. COMPARABLE DATA IS REVIEWED THROUGH SCIENTIFIC ORGANIZATIONS SIMILAR TO CUAHSI AD GENERAL SALARY SURVEYS. IF NEEDED, AN INDEPENDENT SOURCE IS RETAINED FOR FURTHER COMPARISONS.</ExplanationTxt>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>CORPORATION MEMBERS CONSIST OF TWO DIFFERENT CLASSES OF MEMBERSHIP. MEMBER UNIVERSITIES, ARE UNIVERSITIES CHARTERED IN THE UNITED STATES WITH GRADUATE DEGREE PROGRAMS IN HYDROLOGIC SCIENCES, AND A COMMMITMENT TO RESEARCH IN THAT FIELD. EACH MEMBER UNIVERSITY MAY ELECT UP TO 3 REPRESENTATIVES TO PARTICIPATE IN THE GOVERNANCE OF THE CORPORATION AND MAY SERVE ON THE BOARD OF DIRECTORS. AFFILIATE MEMBERS ARE RESEARCH INSTITUTIONS, OTHER NOT-FOR-PROFIT ORGANIZATIONS AND BUSINESSES IN THE UNTIED STATES THAT ARE ENGAGED IN HYDROLOGIC SCIENCE AND CLOSELY RELATED FIELDS. EACH AFFILIATE MEMBER WILL ELECT A REPRESENTATIVE TO PARTICIPATE IN THE GOVERNANCE OF THE CORPORATION OTHER THAN SERVING ON THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH MEMBER WILL VOTE ON A NOMINATED MEMBER UNIVERSITY REPRESENTATIVE TO SERVE ON THE BOARD OF DIRECTORS FOR A THREE YEAR TERM. EVERY YEAR AT THE MEMBERSHIP MEETING, THREE DIRECTORS WILL BE VOTED INTO THE BOARD OF DIRECTORS. AS A MEMBER OF THE BOARD, THAT REPRESENTATIVE WILL HAVE FULL POWER IN THE MANAGEMENT OF THE CORPORATION'S AFFAIRS, ALONG WITH THE OTHER BOARD MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE 990 IS PREPARED BY THE AUDITORS, WITH THE ASSISTANCE OF THE CONTROLLER. THE DRAFT 990 IS THEN REVIEWED BY THE CONTROLLER AND AN EXTRENAL CPA FOR ACCURACY AND COMPLETION. ONCE APPROVAL OF THE DRAFT IS GIVEN TO THE AUDITORS, A FINAL DRAFT IS RELEASED TO BE REVIEWED AND SIGNED BY THE EXECUTIVE DIRECTOR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL DIRECTORS ARE GIVEN THE CONFLICT OF INTEREST POLICY UPON ACCEPTING THE POSITION OF THE GOVERNING BODY. ALL TRANSACTIONS ENTERED INTO BY CUAHSI ARE REVIEWED FOR POSSIBLE CONFLICTS OF INTEREST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>AN EXECUTIVE COMPENSATION COMMITTEE COMPRISED OF OFFICERS AND DIRECTORS REVIEWS AND DETERMINES THE EXECUTIVE DIRECTOR'S PERFORMANCE AND SALARY ON AN ANNUAL BASIS. COMPARABLE DATA IS REVIEWED THROUGH SCIENTIFIC ORGANIZATIONS SIMILAR TO CUAHSI AND GENERAL SALARY SURVEYS. IF NEEDED, AN INDEPENDENT SOURCE IS RETAINED FOR FURTHER COMPARISONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS ARE AVAILABLE AND ARE POSTED ON THE ORGANIZATIONS WEBSITE. CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS ARE AVAILABLE UPON REQUEST AND CAN BE SENT VIA HARD COPY MAIL OR EMAIL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AUDIT IS IN PROCESS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>