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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>We compared to Top Program executives at major nonprofits and to TopExecutives among similarly situated environmental and researchorganizations. The market pricing blends both functions (Top Executiveand Top Program), and we adjusted the Top Executive data down by afactor of 15% to reflect the shared responsibilities between the Founders.The two roles are sufficiently distinct that we used the Top Program matchwithout a discount.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15b</FormAndLineReferenceDesc>
        <ExplanationTxt>An outside human resources consultancy conducted an executive compensation study. They completed a compensation analysis with comparisons based on a market analysis of comparable roles at similarly situated environmental and research organization. These findings were presented to the Board. The findings stated that total remuneration for these positions within a reasonable range of the market 75th percentile is comparable to that paid by like organizations for like services under like circumstances and is therefore reasonable for purposes of IRS Intermediate Sanctions regulations. Based on these findings and the market comps, the Board set salaries for the top management and key employees. Spark's current Executive Director, Erika Reinhardt, elected to forego compensation and offer her services on a volunteer basis. Board Directors and Officers do not receive compensation for their service on the Board. One Board Director, David Mann shows a salary because of his work as a Spark employee, not his role as Board Director. Erika Reinhardt, David Koweek and Cooper Rinzler, the other Board Directors, don't show a salary because there isn't compensation for serving on the Board.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Governing Documents are available upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>