Section 322. Alternative procurement procedures

In accordance with section
  three  hundred seventeen, a contract may be awarded according to another
  procurement procedure established by  rule  of  the  procurement  policy
  board,  under  circumstances,  defined by rule of the procurement policy
  board, in which the use  of such procedures is in the best  interest  of
  the  city.  An  agency  determination  to  utilize  such  an alternative
  procurement procedure for a particular procurement or for  a  particular
  type  of  procurement  shall  require  the written approval of the mayor
  prior to seeking bids or proposals.   The  agency  contract  file  shall
  contain  the  determination  to use an alternative procurement procedure
  which shall state (1) which circumstances defined by the board to be  in
  the  best  interest  of the city apply to the procurement, including the
  basis upon which the agency  made  such  determination,  and  (2)  which
  procedure, as defined by the board pursuant to this section, was used in
  awarding the contract.