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        <FundraisingAmt>11639</FundraisingAmt>
      </OtherEmployeeBenefitsGrp>
      <PayrollTaxesGrp>
        <TotalAmt>97683</TotalAmt>
        <ProgramServicesAmt>66610</ProgramServicesAmt>
        <ManagementAndGeneralAmt>22868</ManagementAndGeneralAmt>
        <FundraisingAmt>8205</FundraisingAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>81175</TotalAmt>
        <ProgramServicesAmt>55354</ProgramServicesAmt>
        <ManagementAndGeneralAmt>19005</ManagementAndGeneralAmt>
        <FundraisingAmt>6816</FundraisingAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>25340</TotalAmt>
        <ProgramServicesAmt>19408</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5932</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <OfficeExpensesGrp>
        <TotalAmt>20936</TotalAmt>
        <ProgramServicesAmt>16372</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3943</ManagementAndGeneralAmt>
        <FundraisingAmt>621</FundraisingAmt>
      </OfficeExpensesGrp>
      <OccupancyGrp>
        <TotalAmt>62395</TotalAmt>
        <ProgramServicesAmt>42548</ProgramServicesAmt>
        <ManagementAndGeneralAmt>14608</ManagementAndGeneralAmt>
        <FundraisingAmt>5239</FundraisingAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>53644</TotalAmt>
        <ProgramServicesAmt>44624</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4408</ManagementAndGeneralAmt>
        <FundraisingAmt>4612</FundraisingAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>24845</TotalAmt>
        <ProgramServicesAmt>24214</ProgramServicesAmt>
        <ManagementAndGeneralAmt>290</ManagementAndGeneralAmt>
        <FundraisingAmt>341</FundraisingAmt>
      </ConferencesMeetingsGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>6673</TotalAmt>
        <ProgramServicesAmt>4682</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1431</ManagementAndGeneralAmt>
        <FundraisingAmt>560</FundraisingAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>37557</TotalAmt>
        <ProgramServicesAmt>26653</ProgramServicesAmt>
        <ManagementAndGeneralAmt>8462</ManagementAndGeneralAmt>
        <FundraisingAmt>2442</FundraisingAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>CONSULTANTS</Desc>
        <TotalAmt>1097836</TotalAmt>
        <ProgramServicesAmt>1061472</ProgramServicesAmt>
        <ManagementAndGeneralAmt>33564</ManagementAndGeneralAmt>
        <FundraisingAmt>2800</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>PRINTING &amp; REPRODUCTION</Desc>
        <TotalAmt>108478</TotalAmt>
        <ProgramServicesAmt>62488</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5608</ManagementAndGeneralAmt>
        <FundraisingAmt>40382</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>POSTAGE &amp; SHIPPING</Desc>
        <TotalAmt>24557</TotalAmt>
        <ProgramServicesAmt>4876</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5749</ManagementAndGeneralAmt>
        <FundraisingAmt>13932</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>TELEPHONE &amp; INTERNET</Desc>
        <TotalAmt>21618</TotalAmt>
        <ProgramServicesAmt>15176</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4981</ManagementAndGeneralAmt>
        <FundraisingAmt>1461</FundraisingAmt>
      </OtherExpensesGrp>
      <AllOtherExpensesGrp>
        <TotalAmt>71775</TotalAmt>
        <ProgramServicesAmt>30558</ProgramServicesAmt>
        <ManagementAndGeneralAmt>24145</ManagementAndGeneralAmt>
        <FundraisingAmt>17072</FundraisingAmt>
      </AllOtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>2931825</TotalAmt>
        <ProgramServicesAmt>2291495</ProgramServicesAmt>
        <ManagementAndGeneralAmt>435311</ManagementAndGeneralAmt>
        <FundraisingAmt>205019</FundraisingAmt>
      </TotalFunctionalExpensesGrp>
      <CashNonInterestBearingGrp>
        <BOYAmt>644471</BOYAmt>
        <EOYAmt>325774</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
        <BOYAmt>1154927</BOYAmt>
        <EOYAmt>932366</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <PledgesAndGrantsReceivableGrp>
        <BOYAmt>326763</BOYAmt>
        <EOYAmt>83095</EOYAmt>
      </PledgesAndGrantsReceivableGrp>
      <InventoriesForSaleOrUseGrp>
        <BOYAmt>5853</BOYAmt>
        <EOYAmt>6391</EOYAmt>
      </InventoriesForSaleOrUseGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>38719</BOYAmt>
        <EOYAmt>46882</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>54383</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>44717</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>11833</BOYAmt>
        <EOYAmt>9666</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <TotalAssetsGrp>
        <BOYAmt>2182566</BOYAmt>
        <EOYAmt>1404174</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>161330</BOYAmt>
        <EOYAmt>253603</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <DeferredRevenueGrp>
        <BOYAmt>9770</BOYAmt>
        <EOYAmt>8482</EOYAmt>
      </DeferredRevenueGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>171100</BOYAmt>
        <EOYAmt>262085</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsSFAS117Ind>X</OrganizationFollowsSFAS117Ind>
      <UnrestrictedNetAssetsGrp>
        <BOYAmt>863002</BOYAmt>
        <EOYAmt>764403</EOYAmt>
      </UnrestrictedNetAssetsGrp>
      <TemporarilyRstrNetAssetsGrp>
        <BOYAmt>1148464</BOYAmt>
        <EOYAmt>377686</EOYAmt>
      </TemporarilyRstrNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>2011466</BOYAmt>
        <EOYAmt>1142089</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>2182566</BOYAmt>
        <EOYAmt>1404174</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>-869377</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>1953569</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1967526</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2070752</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>3577848</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1909450</CurrentTaxYearAmt>
        <TotalAmt>11479145</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>1953569</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1967526</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2070752</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>3577848</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1909450</CurrentTaxYearAmt>
        <TotalAmt>11479145</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>5735470</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>5743675</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>2292</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1730</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2867</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1267</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2900</CurrentTaxYearAmt>
        <TotalAmt>11056</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <OtherIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>33302</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>26008</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4695</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>22593</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>80184</CurrentTaxYearAmt>
        <TotalAmt>166782</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>11656983</TotalSupportAmt>
      <PublicSupportCY170Pct>0.49270</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.42830</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleC documentId="RetDoc1039600001">
      <TotalDirectLobbyingGrp>
        <FilingOrganizationsTotalAmt>89</FilingOrganizationsTotalAmt>
      </TotalDirectLobbyingGrp>
      <TotalLobbyingExpendGrp>
        <FilingOrganizationsTotalAmt>89</FilingOrganizationsTotalAmt>
      </TotalLobbyingExpendGrp>
      <OtherExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>2291406</FilingOrganizationsTotalAmt>
      </OtherExemptPurposeExpendGrp>
      <TotalExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>2291495</FilingOrganizationsTotalAmt>
      </TotalExemptPurposeExpendGrp>
      <LobbyingNontaxableAmountGrp>
        <FilingOrganizationsTotalAmt>264575</FilingOrganizationsTotalAmt>
      </LobbyingNontaxableAmountGrp>
      <GrassrootsNontaxableGrp>
        <FilingOrganizationsTotalAmt>66144</FilingOrganizationsTotalAmt>
      </GrassrootsNontaxableGrp>
      <TotLbbyngGrassrootMnsNonTxGrp>
        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
      </TotLbbyngGrassrootMnsNonTxGrp>
      <TotLbbyExpendMnsLbbyngNonTxGrp>
        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
      </TotLbbyExpendMnsLbbyngNonTxGrp>
      <AvgLobbyingNontaxableAmountGrp>
        <CurrentYearMinus3Amt>239094</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>243687</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>248590</CurrentYearMinus1Amt>
        <CurrentYearAmt>264575</CurrentYearAmt>
        <TotalAmt>995946</TotalAmt>
      </AvgLobbyingNontaxableAmountGrp>
      <LobbyingCeilingAmt>1493919</LobbyingCeilingAmt>
      <AvgTotalLobbyingExpendGrp>
        <CurrentYearMinus3Amt>2304</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>86</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>29</CurrentYearMinus1Amt>
        <CurrentYearAmt>89</CurrentYearAmt>
        <TotalAmt>2508</TotalAmt>
      </AvgTotalLobbyingExpendGrp>
      <AvgGrassrootsNontaxableGrp>
        <CurrentYearMinus3Amt>59774</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>60922</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>62148</CurrentYearMinus1Amt>
        <CurrentYearAmt>66144</CurrentYearAmt>
        <TotalAmt>248988</TotalAmt>
      </AvgGrassrootsNontaxableGrp>
      <GrassrootsCeilingAmt>373482</GrassrootsCeilingAmt>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>54383</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>44717</DepreciationAmt>
        <BookValueAmt>9666</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>9666</TotalBookValueLandBuildingsAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>2102092</TotalRevEtcAuditedFinclStmtAmt>
      <DonatedServicesAndUseFcltsAmt>34641</DonatedServicesAndUseFcltsAmt>
      <OtherRevenueAmt>5003</OtherRevenueAmt>
      <RevenueNotReportedAmt>39644</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>2062448</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>2062448</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>2971469</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>34641</DonatedServicesUseFcltsAmt>
      <OtherExpensesIncludedAmt>5003</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>39644</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>2931825</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>2931825</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INTERNAL REVENUE SERVICE ("IRS") HAS CLASSIFIED THE ORGANIZATION AS EXEMPT FROM FEDERAL INCOME TAXES UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE AND APPLICABLE STATE LAW. IT HAS BEEN CLASSIFIED AS AN ORGANIZATION THAT IS NOT A PRIVATE FOUNDATION UNDER SECTION 509(A)(2) OF THE INTERNAL REVENUE CODE AND QUALIFIES FOR DEDUCTIBLE CONTRIBUTIONS AS PROVIDED IN SECTION 170(B)(1)(A). INCOME GENERATED BY ACTIVITIES THAT WOULD BE CONSIDERED UNRELATED TO THE ORGANIZATION'S MISSION WOULD BE SUBJECT TO TAX, WHICH, IF INCURRED, WOULD BE RECOGNIZED AS A CURRENT EXPENSE. NO SUCH TAX HAS BEEN RECOGNIZED AS OF DECEMBER 31, 2016 AND 2015. THE ORGANIZATION ACCOUNTS FOR UNCERTAINTY IN INCOME TAXES RECOGNIZED IN THE FINANCIAL STATEMENTS USING A RECOGNITION THRESHOLD OF MORE LIKELY THAN NOT AS TO WHETHER THE UNCERTAINTY WILL BE SUSTAINED UPON EXAMINATION BY THE APPROPRIATE TAXING AUTHORITY. MEASUREMENT OF THE TAX UNCERTAINTY OCCURS IF THE RECOGNITION THRESHOLD HAS BEEN MET. MANAGEMENT DETERMINED THERE WERE NO TAX UNCERTAINTIES THAT MET THE RECOGNITION THRESHOLD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>COGS</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>MERCHANDISE</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF DIRECTORS OF THE ORGANIZATION REVIEWS THE FORM 990 AND PROVIDES COMMENTS TO ITS INDEPENDENT CPA FIRM BEFORE FILING THE RETURN.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION REQUIRES BOARD MEMBERS TO SIGN A CONFLICT OF INTEREST POLICY ANNUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY, THE BOARD OF DIRECTORS DETERMINES THE EXECUTIVE DIRECTOR'S (THE DELAWARE RIVERKEEPER) COMPENSATION BY REVIEWING EXECUTIVE DIRECTOR SALARIES OF SIMILAR TYPE AND SIZE ORGANIZATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>