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      <NumberIndividualsGT100K>10</NumberIndividualsGT100K>
      <FormersListed>0</FormersListed>
      <TotalCompGT150K>1</TotalCompGT150K>
      <CompensationFromOtherSources>0</CompensationFromOtherSources>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>COAKLEY &amp; WILLIAMS CONSTRUCTION INC</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressUS>
            <AddressLine1>16 S SUMMIT AVE SUITE 300</AddressLine1>
            <City>GAITHERSBURG</City>
            <State>MD</State>
            <ZIPCode>20877</ZIPCode>
          </AddressUS>
        </AddressOfContractor>
        <DescriptionOfServices>general cont.</DescriptionOfServices>
        <Compensation>3547658</Compensation>
      </ContractorCompensation>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>Fieldturf USA Inc</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressForeign>
            <AddressLine1>8088 MONTVIEW ROAD</AddressLine1>
            <City>MONTREAL TMR</City>
            <ProvinceOrState>QUEBEC</ProvinceOrState>
            <Country>CA</Country>
          </AddressForeign>
        </AddressOfContractor>
        <DescriptionOfServices>General cont.</DescriptionOfServices>
        <Compensation>574652</Compensation>
      </ContractorCompensation>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>SAGE DINING SERVICES INC</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressUS>
            <AddressLine1>222 BOSLEY AVE SUITE B7</AddressLine1>
            <City>TOWSON</City>
            <State>MD</State>
            <ZIPCode>21204</ZIPCode>
          </AddressUS>
        </AddressOfContractor>
        <DescriptionOfServices>Food service</DescriptionOfServices>
        <Compensation>550754</Compensation>
      </ContractorCompensation>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>SODEXHO INC &amp; AFFILIATES</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressUS>
            <AddressLine1>PO BOX 905374</AddressLine1>
            <City>CHARLOTTE</City>
            <State>NC</State>
            <ZIPCode>28290</ZIPCode>
          </AddressUS>
        </AddressOfContractor>
        <DescriptionOfServices>Janitorial</DescriptionOfServices>
        <Compensation>315425</Compensation>
      </ContractorCompensation>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>COX GRAAE &amp; SPACK ARCHITECTS</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressUS>
            <AddressLine1>2909 M STREET NW</AddressLine1>
            <City>WASHINGTON</City>
            <State>DC</State>
            <ZIPCode>20007</ZIPCode>
          </AddressUS>
        </AddressOfContractor>
        <DescriptionOfServices>ARCHITECTS</DescriptionOfServices>
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      </ContractorCompensation>
      <NumberOfContractorsGT100K>9</NumberOfContractorsGT100K>
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      <ProgramServiceRevenue>
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      <ProgramServiceRevenue>
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      <ProgramServiceRevenue>
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        <RelatedOrExemptFunctionIncome>63671</RelatedOrExemptFunctionIncome>
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      <ProgramServiceRevenue>
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      <GainOrLoss>
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        <TotalRevenueColumn>-27727</TotalRevenueColumn>
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        <ExclusionAmount>204403</ExclusionAmount>
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        <TotalRevenueColumn>97001</TotalRevenueColumn>
        <ExclusionAmount>97001</ExclusionAmount>
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      <OtherRevenueMisc>
        <Description>OTHER INCOME</Description>
        <BusinessCode>900099</BusinessCode>
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      <TotalOtherRevenue>243008</TotalOtherRevenue>
      <TotalRevenue>
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      <GrantsToDomesticIndividuals>
        <Total>2936053</Total>
        <ProgramServices>2936053</ProgramServices>
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      <CompCurrentOfficersDirectors>
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      <OtherEmployeeBenefits>
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      <FeesForServicesAccounting>
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      </FeesForServicesAccounting>
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      <Advertising>
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        <ProgramServices>11824</ProgramServices>
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      <OfficeExpenses>
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        <ManagementAndGeneral>63415</ManagementAndGeneral>
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      </InformationTechnology>
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        <ProgramServices>1196427</ProgramServices>
        <ManagementAndGeneral>265645</ManagementAndGeneral>
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      <Travel>
        <Total>135617</Total>
        <ProgramServices>127602</ProgramServices>
        <Fundraising>8015</Fundraising>
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      <ConferencesMeetings>
        <Total>85585</Total>
        <ProgramServices>62502</ProgramServices>
        <ManagementAndGeneral>18961</ManagementAndGeneral>
        <Fundraising>4122</Fundraising>
      </ConferencesMeetings>
      <Interest>
        <Total>2513814</Total>
        <ProgramServices>1809946</ProgramServices>
        <ManagementAndGeneral>578179</ManagementAndGeneral>
        <Fundraising>125689</Fundraising>
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        <Total>2839491</Total>
        <ProgramServices>2044433</ProgramServices>
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      <Insurance>
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        <ProgramServices>212093</ProgramServices>
        <ManagementAndGeneral>47312</ManagementAndGeneral>
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      <OtherExpenses>
        <Description>SUMMER PROGRAMS</Description>
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        <ProgramServices>1299198</ProgramServices>
      </OtherExpenses>
      <OtherExpenses>
        <Description>FOOD &amp; entertainment</Description>
        <Total>646520</Total>
        <ProgramServices>465494</ProgramServices>
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        <Fundraising>32326</Fundraising>
      </OtherExpenses>
      <OtherExpenses>
        <Description>BAD DEBTS</Description>
        <Total>348551</Total>
        <ManagementAndGeneral>348551</ManagementAndGeneral>
      </OtherExpenses>
      <OtherExpenses>
        <Description>AERO PROGRAM EXPENSES</Description>
        <Total>244379</Total>
        <ProgramServices>244379</ProgramServices>
      </OtherExpenses>
      <OtherExpenses>
        <Description>other expenses</Description>
        <Total>193329</Total>
        <ProgramServices>227515</ProgramServices>
        <ManagementAndGeneral>-28896</ManagementAndGeneral>
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      </OtherExpenses>
      <AllOtherExpenses>
        <Total>804944</Total>
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      <TotalFunctionalExpenses>
        <Total>35117502</Total>
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        <Fundraising>1577889</Fundraising>
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      <CashNonInterestBearing>
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        <EOY>500</EOY>
      </CashNonInterestBearing>
      <SavingsAndTempCashInvestments>
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      </SavingsAndTempCashInvestments>
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      <LandBuildingsEquipmentBasisNet>
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      </LandBuildingsEquipmentBasisNet>
      <InvestmentsPubTradedSecurities>
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        <EOY>13682494</EOY>
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      <TotalAssets>
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      <AccountsPayableAccruedExpenses>
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      <TaxExemptBondLiabilities>
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        <EOY>34002842</EOY>
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      <MortNotesPyblSecuredInvestProp>
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      </MortNotesPyblSecuredInvestProp>
      <OtherLiabilities>
        <BOY>2091166</BOY>
        <EOY>2939721</EOY>
      </OtherLiabilities>
      <TotalLiabilities>
        <BOY>54501424</BOY>
        <EOY>48546321</EOY>
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      <FollowSFAS117>X</FollowSFAS117>
      <UnrestrictedNetAssets>
        <BOY>56480448</BOY>
        <EOY>59983264</EOY>
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      <TemporarilyRestrictedNetAssets>
        <BOY>4414691</BOY>
        <EOY>2683131</EOY>
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      <PermanentlyRestrictedNetAssets>
        <BOY>2005772</BOY>
        <EOY>2125208</EOY>
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      <TotalNetAssetsFundBalances>
        <BOY>62900911</BOY>
        <EOY>64791603</EOY>
      </TotalNetAssetsFundBalances>
      <TotalLiabNetAssetsFundBalances>
        <BOY>117402335</BOY>
        <EOY>113337924</EOY>
      </TotalLiabNetAssetsFundBalances>
      <MethodOfAccountingAccrual>X</MethodOfAccountingAccrual>
      <AccountantCompileOrReview>0</AccountantCompileOrReview>
      <FSAudited>1</FSAudited>
      <AuditCommittee>1</AuditCommittee>
      <FinancialStatementSeparate>X</FinancialStatementSeparate>
      <FederalGrantAuditRequired>0</FederalGrantAuditRequired>
    </IRS990>
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        <ContributorNameBusiness>
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        </ContributorNameBusiness>
        <ContributorAddressUS>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorAddressUS>
        <AggregateContributions>RESTRICTED</AggregateContributions>
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        <Contributions>142596</Contributions>
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      <EndowmentsHeldByRelatedOrgs>0</EndowmentsHeldByRelatedOrgs>
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        <BookValue>1293183</BookValue>
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      <OtherSecurities>
        <Description>LIMITED PARTNERSHIPS</Description>
        <BookValue>558085</BookValue>
        <MethodOfValuation>C</MethodOfValuation>
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      <OtherSecurities>
        <Description>MULTI Strategy EQUITY fund</Description>
        <BookValue>13214918</BookValue>
        <MethodOfValuation>F</MethodOfValuation>
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        <Description>INTEREST RATE SWAP agreement</Description>
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      <Form990ScheduleDPartXIV>
        <Identifier>Part V, Line 4:</Identifier>
        <ReturnReference>Description of Intended Use of Endowment Funds:</ReturnReference>
        <Explanation>Endowment funds are used to provide financial aid, purchase library books, frame student artwork, fund community service, faculty salaries and enrichment, science programs, theater and music, pay for financing of new buildings.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>Part X:</Identifier>
        <ReturnReference>Description of Uncertain Tax Positions Under FIN 48:</ReturnReference>
        <Explanation>The School adopted the accounting standard on accounting for uncertainty in income taxes (FASB ASC Topic 740-10), which addresses the determination of whether tax benefits claimed or expected to be claimed on a tax return should be recorded in the financial statements. Under this guidance, the School may recognize the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. The guidance on accounting for uncertainty in income taxes also addresses de-recognition, classification, interest and penalties on income taxes, and accounting in interim periods. Management evaluated the School's tax positions and concluded that the School had taken no uncertain tax positions that require adjustment to the financial statements to comply with the provisions of this guidance. The School files income tax returns in the U.S. federal jurisdiction. With few exceptions, the School is no longer subject to income tax examinations by the U.S. federal, state or local tax authorities for years before 2007.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>Part XII, Line 4b - Other Adjustments:</Identifier>
        <Explanation>FINANCIAL AID: 2917378. Cost of goods sold- bookstore: -276964.</Explanation>
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      <Form990ScheduleDPartXIV>
        <Identifier>Part XIII, Line 2d - Other Adjustments:</Identifier>
        <Explanation>Cost of goods sold- bookstore: 276964.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>Part XIII, Line 4b - Other Adjustments:</Identifier>
        <Explanation>FINANCIAL AID: 2917378.</Explanation>
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      <PolicyStatementInBrochuresEtc>1</PolicyStatementInBrochuresEtc>
      <PolicyPublViaBroadcastMedia>1</PolicyPublViaBroadcastMedia>
      <PubViaBroadcastMediaExpln>AN ANNOUCEMENT IS PRINTED IN THE WASHINGTON POST NEWSPAPER.</PubViaBroadcastMediaExpln>
      <MaintRacialCompositionRecords>1</MaintRacialCompositionRecords>
      <MaintScholarshipsRecords>1</MaintScholarshipsRecords>
      <MaintCopiesOfBrochuresEtc>1</MaintCopiesOfBrochuresEtc>
      <MaintCopiesOfAllSolicitations>1</MaintCopiesOfAllSolicitations>
      <DiscriminateRaceStudentsRights>0</DiscriminateRaceStudentsRights>
      <DiscriminateRaceAdmissPolicies>0</DiscriminateRaceAdmissPolicies>
      <DiscriminateRaceEmplmnFaculty>0</DiscriminateRaceEmplmnFaculty>
      <DiscriminateRaceScholarships>0</DiscriminateRaceScholarships>
      <DiscriminateRaceEducPolicies>0</DiscriminateRaceEducPolicies>
      <DiscriminateRaceUseOfFclts>0</DiscriminateRaceUseOfFclts>
      <DiscriminateRaceAthleticProg>0</DiscriminateRaceAthleticProg>
      <DiscriminateRaceOtherActy>0</DiscriminateRaceOtherActy>
      <GovernmentFinancialAidReceived>0</GovernmentFinancialAidReceived>
      <GovernmentFinancialAidRevoked>0</GovernmentFinancialAidRevoked>
      <ComplianceWithRevProc7550>1</ComplianceWithRevProc7550>
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      <EventsInformation>
        <NameOfEvent1>Fall Frolic Carnival</NameOfEvent1>
        <GrossReceiptsEvent1>85037</GrossReceiptsEvent1>
        <CharitableContributionsEvent1>8400</CharitableContributionsEvent1>
        <GrossRevenueEvent1>76637</GrossRevenueEvent1>
        <OtherDirectExpensesEvent1>39410</OtherDirectExpensesEvent1>
        <NameOfEvent2>Spring Auction</NameOfEvent2>
        <GrossReceiptsEvent2>328616</GrossReceiptsEvent2>
        <CharitableContributionsEvent2>102030</CharitableContributionsEvent2>
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      <Form990ScheduleIPartIII>
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        <ReturnReference>Part I, Line 2:</ReturnReference>
        <Explanation>Schedule I, Part I, Line 2: THE POTOMAC SCHOOL UTILIZES THE SERVICES OF THE NATIONAL ASSOCIATION OF INDEPENDENT SCHOOLS TO HELP EVALUATE EACH STUDENT'S NEEDS FOR FINANCIAL ASSISTANCE. EACH APPLICANT COMPLETES A standardized FORM "SCHOOL AND STUDENT SERVICE FOR FINANCIAL AID." THE INFORMATION CONTAINED IN THIS IS PROCESSED IN PRINCETON, NEW JERSEY. AN EVALUATION IS PRODUCED WHICH INCLUDES RECOMMENDATIONS AS TO THE LEVEL OF FINANCIAL ASSISTANCE REQUIRED. THE SCHOOL USES THESE REPORTS AS A GUIDE TO DETERMINE WHICH STUDENTS REQUIRE FINANCIAL ASSISTANCE AND AN ESTIMATE OF THAT NEED.</Explanation>
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          <BusinessNameLine1>Shelia O'Marah</BusinessNameLine1>
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        <NameBusiness>
          <BusinessNameLine1>Donna Lewis</BusinessNameLine1>
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        <BaseCompensationFilingOrg>117877</BaseCompensationFilingOrg>
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        <BonusFilingOrg>0</BonusFilingOrg>
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        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartIII>
        <ReturnReference>Part I, Line 1a</ReturnReference>
        <Explanation>THE SCHOOL COMPENSATES THE HEADMASTER AND VARIOUS DEPARTMENT HEADS. THE SCHOOL PROVIDES THE HEADMASTER AND VARIOUS DEPARTMENT HEADS WITH HOUSING. THE RENTAL VALUE REFLECTS THE FAIR MARKET VALUE FOR COMPARABLE HOUSES IN THE AREA. THE TRANSACTIONS WERE APPROVED BY THE BOARD OF TRUSTEES WITH ADEQUATE DOCUMENTATION.</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <ReturnReference>Part I, Line 4a</ReturnReference>
        <Explanation>Brendan Sheerin, severance payment, $60,066 geoffrey jones, supplemental nonqualified retirement plan, $54,661</Explanation>
      </Form990ScheduleJPartIII>
    </IRS990ScheduleJ>
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      <Form990ScheduleKPartI>
        <IssuerName>
          <BusinessNameLine1>Fairfax County Economic Development Authority</BusinessNameLine1>
        </IssuerName>
        <IssuerEIN>540787833</IssuerEIN>
        <DateIssued>2004-07-12</DateIssued>
        <IssuePrice>16430000</IssuePrice>
        <DescriptionOfPurpose>Redemption of Prior Bonds and School Construction</DescriptionOfPurpose>
        <Defeased>0</Defeased>
        <OnBehalfOfIssuer>0</OnBehalfOfIssuer>
      </Form990ScheduleKPartI>
      <Form990ScheduleKPartI>
        <IssuerName>
          <BusinessNameLine1>Fairfax County Economic Development Authority</BusinessNameLine1>
        </IssuerName>
        <IssuerEIN>540787833</IssuerEIN>
        <DateIssued>2005-08-04</DateIssued>
        <IssuePrice>20570000</IssuePrice>
        <DescriptionOfPurpose>Construction of new upper school building</DescriptionOfPurpose>
        <Defeased>0</Defeased>
        <OnBehalfOfIssuer>0</OnBehalfOfIssuer>
      </Form990ScheduleKPartI>
      <Form990ScheduleKPartII>
        <TotalProceeds>16430000</TotalProceeds>
        <CapitalExpenditures>5645549</CapitalExpenditures>
        <YearOfSubstCompletion>2004</YearOfSubstCompletion>
        <CurrentRefunding>1</CurrentRefunding>
        <AdvanceRefunding>0</AdvanceRefunding>
        <FinalAllocationMade>0</FinalAllocationMade>
        <AdequateBooksAndRecdsMaintaind>1</AdequateBooksAndRecdsMaintaind>
      </Form990ScheduleKPartII>
      <Form990ScheduleKPartII>
        <TotalProceeds>20570000</TotalProceeds>
        <CapitalExpenditures>20570000</CapitalExpenditures>
        <YearOfSubstCompletion>2006</YearOfSubstCompletion>
        <CurrentRefunding>0</CurrentRefunding>
        <AdvanceRefunding>0</AdvanceRefunding>
        <FinalAllocationMade>0</FinalAllocationMade>
        <AdequateBooksAndRecdsMaintaind>1</AdequateBooksAndRecdsMaintaind>
      </Form990ScheduleKPartII>
      <Form990ScheduleKPartIII>
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        <AnyLeaseArrangements>0</AnyLeaseArrangements>
        <MngmentCntrctBondFinancdPrprty>0</MngmentCntrctBondFinancdPrprty>
        <AnyResearchAgreements>0</AnyResearchAgreements>
        <BondCounselRoutinelyEngaged>1</BondCounselRoutinelyEngaged>
        <PrcntgePrvtBusinessUseByOthers>0.00000</PrcntgePrvtBusinessUseByOthers>
        <PercentageOfPrvtBusinessReUBI>0.00000</PercentageOfPrvtBusinessReUBI>
        <TotalPrivateBusinessUse>0.00000</TotalPrivateBusinessUse>
        <PostIssuanceComplianceProcdrs>1</PostIssuanceComplianceProcdrs>
      </Form990ScheduleKPartIII>
      <Form990ScheduleKPartIII>
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        <AnyResearchAgreements>0</AnyResearchAgreements>
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        <VariableRateIssue>0</VariableRateIssue>
        <HedgeIdentifiedInBooksAndRecds>0</HedgeIdentifiedInBooksAndRecds>
        <GrossProceedsInvestedInGIC>0</GrossProceedsInvestedInGIC>
        <GrossProceedsInvested>0</GrossProceedsInvested>
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      <Form990ScheduleKPartIV>
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        <VariableRateIssue>1</VariableRateIssue>
        <HedgeIdentifiedInBooksAndRecds>1</HedgeIdentifiedInBooksAndRecds>
        <NameOfHedgeProvider>
          <BusinessNameLine1>PNC BANK</BusinessNameLine1>
        </NameOfHedgeProvider>
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    <IRS990ScheduleM documentId="RetDoc1042900001">
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        <NonCashCheckbox>X</NonCashCheckbox>
        <NumberOfContributions>8</NumberOfContributions>
        <NoncashContribsRptdF990>505583</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>confirmation from broker</MethodOfDeterminingRevenues>
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        <Identifier>Third Party Use:</Identifier>
        <ReturnReference>Part I, Line 32b:</ReturnReference>
        <Explanation>the organization sells marketable securities through a broker.</Explanation>
      </Form990ScheduleMPartII>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section A, line 2</Identifier>
        <Explanation>JEAN CASE, TRUSTEE AND TOM ECKERT, TRUSTEE - BUSINESS RELATIONSHIP</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section B, line 11</Identifier>
        <Explanation>The 990 is reviewed and approved by the Audit Committee. After that iT goes to the full Board for review and approval.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section B, line 12c</Identifier>
        <Explanation>FOR KEY EMPLOYEES: Where a potential conflict of interest exists, it shall be the responsibility of the person involved or any other person with knowledge to notify the HEAD OF SCHOOL of the circumstances resulting in the potential conflict so that IT CAN BE COMMUNICATED TO the Board of Trustees WHO can, IN COUNSEL WITH THE HEAD OF SCHOOL, THEN provide such guidance and take such action as THEY shall deem appropriate. This statement shall be signed annually by all KEY EMPLOYEES. FOR BOARD OF TRUSTEES: Where a potential conflict of interest exists, it shall be the responsibility of the person involved or any other person with knowledge to notify the Chair and Vice Chair of the Board of Trustees as well as the Chair of the Governance Committee of the circumstances resulting in the potential conflict so that the Board of Trustees can provide such guidance and take such action as it shall deem appropriate. This statement shall be signed annually by all Trustees.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section B, line 15</Identifier>
        <Explanation>The Compensation Committee reviews and discusses the total compensation packages of the Head of School and school administrators. Salary information only for similar positions from comparable schools are used to establish a reasonable compensation. The Committee has the authority to approve the compensation package of the Head of School and school administrators on an annual basis.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section C, line 19</Identifier>
        <Explanation>A public inspection file is maintained onsite that includes the 990, governing documents, conflict of interest policy, and financial statements.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>