
    (No. 6492
    Mobil Oil Corporation, Claimant, vs. State of Illinois, Department of Conservation, Respondent.
    
      Opinion filed May 9, 1972.
    
    Mobil Oil Corporation, Claimant, pro se.
    William J. Scott, Attorney General; William E. Webber, Assistant Attorney General, for Respondent.
   Perlin, C.J.  