**Exhibit
      31.2**





**Certification**





I,
      Arthur
      M. Evans, certify that:





1.  I
      have
      reviewed this annual report on Form 10-Q/A of Tri-Valley
      Corporation;





2.  Based
      on
      my knowledge, this report does not contain any untrue statement of a material
      fact or omit to state a material fact necessary to make the statements made,
      in
      light of the circumstances under which such statements were made, not misleading
      with respect to the period covered by this report;





3.  Based
      on
      my knowledge, the financial statements and other financial information included
      in this report fairly present, in all material respects, the financial
      condition, results of operations and cash flows of registrant as of, and for,
      the periods presented in this report;





4.  The
      registrant’s other certifying officer and I are responsible for establishing and
      maintaining disclosure controls and procedures (as defined in the Exchange
      Act
      Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting
      (as
      defined in Exchange Act Rules 13a-15(f) and 15d-15(f) for registrant and
      have:





a.  designed
      such disclosure controls and procedures, or caused such disclosure controls
      and
      procedures to be designed under our supervision, to ensure that material
      information relating to registrant including its consolidated subsidiaries,
      is
      made known to us by others within those entities, particularly during the period
      in which this report is being prepared;





b.  designed
      such internal control over financial reporting, or caused such internal control
      over financial reporting to be designed under our supervision, to provide
      reasonable assurance regarding the reliability of financial reporting and the
      preparation of financial statements for external purposes in accordance with
      generally accepted accounting principles;





c.  evaluated
      the effectiveness of registrant’s disclosure controls and procedures and
      presented in this report our conclusions about the effectiveness of the
      disclosure controls and procedures, as of the end of the period covered by
      this
      report based on such evaluation; and





d.  disclosed
      in this report any change in registrant’s internal control over financial
      reporting that occurred during the small business issuer’s most recent fiscal
      quarter (registrant’s fourth fiscal quarter in the case of an annual report)
      that has materially affected, or is reasonably likely to materially affect,
      registrant’s internal control over financial reporting; and





5.  The
      registrant’s other certifying officer and I have disclosed, based on our most
      recent evaluation of internal control over financial reporting, to our auditors
      and the audit committee of registrant’s board of directors:





a.  all
      significant deficiencies in the design or operation of internal control over
      financial reporting which are reasonably likely to adversely affect registrant’s
      ability to record, process, summarize and report financial information;
      and





b.  any
      fraud, whether or not material, that involves management or other employees
      who
      have a significant role in registrant’s internal control over financial
      reporting.








Date:
                August 29, 2007
            By:
            */s/Arthur
                M. Evans*Arthur
                M. Evans, Chief Financial Officer