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      <RevenueSubtotalAmt>4665471</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>4665471</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>2332959</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>5510</DonatedServicesUseFcltsAmt>
      <OtherExpensesIncludedAmt>7235</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>12745</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>2320214</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>2320214</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt II, Line 5</FormAndLineReferenceDesc>
        <ExplanationTxt>CEs are monitored by Mainspring's conservation easement monitoring staff at least annually with a report to Mainspring's files and the landowner. The handling of violations, monitoring and enforcement are covered in Mainspring's Stewardship Policy Manual.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt II, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Conservation easements purchased are expensed at cost. Conservation easements received by donation are not recorded in the organization's books.(See Schedule O for further information.)</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt II, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>A corrective modification was made on one of the conservation easements held by Mainspring Conservation Trust.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt V, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INTENDED USES OF THE ORGANIZATION'S ENDOWMENT FUNDS ARE TO GENERATE INCOME FOR CONSERVATION EASEMENT STEWARDSHIP, LAND ACQUISITION AND OTHER CONSERVATION PURPOSES CONSISTENT WITH THE PURPOSE AND TERMS OF EACH ENDOWMENT FUND.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt X, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>Mainspring is exempt from federal income taxes under 501(c)(3) of the Internal Revenue Code. Under the Code, income from certain activities not related to the organization's tax-exempt purpose may be subject to taxation as unrelated business income. The organization had less than $1,000 of income from unrelated business activities in the 2017 fiscal year and was, therefore, not required to file Federal Form 990-T (Exempt Organization Business Income Tax Return). The organization believes that it has appropriate support for all tax positions taken, and as such, does not have any uncertain tax positions that are material to the financial statements.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt XI, Line 2d</FormAndLineReferenceDesc>
        <ExplanationTxt>Loss on Sale of Land $5,500, Fundraising Expenses $940, Raffle Expenses $795</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt XII, Line 2d</FormAndLineReferenceDesc>
        <ExplanationTxt>Loss on Sale of Land $5,500, Fundraising Expenses $940, Raffle Expenses $795</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleM documentId="00000005">
      <CarsAndOtherVehiclesGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>13900</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Appraisal</MethodOfDeterminingRevenuesTxt>
      </CarsAndOtherVehiclesGrp>
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>10</ContributionCnt>
        <NoncashContributionsRptF990Amt>149849</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Fair Market Value</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <QualifiedContribOtherGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>1</ContributionCnt>
        <MethodOfDeterminingRevenuesTxt>See Part II</MethodOfDeterminingRevenuesTxt>
      </QualifiedContribOtherGrp>
      <RealEstateOtherGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>7</ContributionCnt>
        <NoncashContributionsRptF990Amt>1431562</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Appraisal</MethodOfDeterminingRevenuesTxt>
      </RealEstateOtherGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Office Supplies</Desc>
        <ContributionCnt>2</ContributionCnt>
        <NoncashContributionsRptF990Amt>275</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Fair Market Value</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Land Conservation</Desc>
        <ContributionCnt>3</ContributionCnt>
        <NoncashContributionsRptF990Amt>10768</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Fair Market Value</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <Form8283ReceivedCnt>3</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>false</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt I Line 30b</FormAndLineReferenceDesc>
        <ExplanationTxt>Mainspring does not carry conservation easements as assets on the organization's books. Accordingly, donated conservation easements are not recognized in revenue.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other</FormAndLineReferenceDesc>
        <ExplanationTxt>Line 17 Real estate - Other - Land donations are reported on this line.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="00000006" softwareId="17005306">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>Per the Bylaws, the Executive Committee may exercise the powers of the Board between Board meetings, except as may be limited by the North Carolina Nonprofit Corporation Act, or may make recommendations to the Board with respect to any matters that come before it. All actions taken by the Executive Committee shall be reported to the Board of Directors at the meeting following such action.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The 990 is initially reviewed by the Finance Manager and the Executive Director. It is then provided to the Finance Committee for review and approval. Finally, the 990 is sent to the Board of Directors prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>A conflict of interest statement is handed out to the Board of Directors in attendance at the first board meeting of the new year and are asked to complete it and hand it in at that time. The statement is mailed to any Board of Director who misses that meeting. To ensure all the completed forms are returned within one month, a designated staff member follows up with anyone who has not submitted the signed form. Staff is given a Conflict of Interest statement to complete each January, or if new to the organization at their time of hire. The Finance Manager reviews the statements. In addition, the Executive Director monitors the statements for any possible conflicts of interest.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>In the annual budgeting process, the Board approves a budget line for aggregate salary expense. Thereafter, the Executive Director gives consideration to comparable salary information for land trust nonprofit organizations with similar budgets, as available, and local job markets. The Executive Committee sets the Executive Director salary after a performance review and a check of comparable salary information for related land trust nonprofit organizations with similar budgets.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 18</FormAndLineReferenceDesc>
        <ExplanationTxt>Forms 1023 and 990 are available upon request. The Form 990 is also available on the organization's website.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Governing documents, Conflict of Interest policy and audited financial statements are available upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other</FormAndLineReferenceDesc>
        <ExplanationTxt>Net investment gains on Endowment held with the Community Foundation of Western NC amounted to $117,660.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt XII, Line 2c</FormAndLineReferenceDesc>
        <ExplanationTxt>The Audit Committee directly reviews the audit.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other</FormAndLineReferenceDesc>
        <ExplanationTxt>Sch D, Ln 3&amp;5 - Since U.S. GAAP does not provide specific guidance on the accounting treatment for conservation easements, land trust organizations in the U.S. use several different methods to account for the easements they hold. Mainspring has adopted one such method which is widely used by other land trusts. Under this method, conservation easements are not recognized as assets. Accordingly, easements received by donation are not recorded in income and easements purchased by the organization are recorded as expenses. Management believes that this method results in financial statements that most accurately reflect the organization's financial activities.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Program Event Expense 6074. 3591. 2453. 30.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Dues/Subscriptions 4951. 2350. 2281. 320.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Miscellaneous 12051. 10116. 1308. 627.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Field Equipment 459. 459. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Project Management 32150. 32150. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Property Tax-Lands 7562. 7562. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Staff Development 5508. 1918. 2121. 1469.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Land Disbursement Expense 4048. 4048. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>