Section 22. Supervision of contracts

The corporation shall provide for
  field supervision over improvement, maintenance or repair  work  on  the
  canal  system  that is done under contract. The corporation shall assign
  such engineers, inspectors and other engineering  employees  as  may  be
  necessary  for  control  over  the execution of the work embraced in the
  contract. Such corporation shall cause the preparation and  approval  of
  the  estimates  of  the work accomplished, materials delivered, or other
  items embodied in the contract and the  certificate  of  the  amount  of
  payment  which  may  be  due  under  the  terms of the contract or legal
  modifications of the same. Upon  the  completion  of  any  contract  the
  corporation shall cause the preparation and approval of a certificate of
  acceptance, stating that the work has been well and faithfully performed
  in  accordance  with  the  terms  and conditions of the contract and all
  legal modifications thereof.