The Kenner City Council will hold a special meeting Thursday evening to reconsider a four-year auditing contract it awarded last month.

The issue arose after it became evident that not all council members used the same methodology when they scored the five firms that submitted proposals before they voted on June 18.

Councilwoman Maria DeFrancesch said she and Councilmen Leonard Cline, Keith Conley and Dominick Impastato called for the meeting after Cline, a new councilman, realized he had erroneously given a zero score in the “cost” category to the four applicants who did not submit the lowest bid.

Cost was supposed to be weighted at 40 points out of 100 in assigning scores, while qualifications made up the other 60 points.

DeFrancesch said Cline’s zero scores would affect the point tally that, when averaged, made up the scores that council members used to guide their vote.

DeFrancesch said all of the firms were qualified and a retally might not even result in a new selection. But she said the selection process needs to be done correctly for the choice to be credible.

She said a second scoring tally and revote require a special meeting because the new contract takes effect Monday and the council’s next regular meeting is July 9.

The contract was awarded last month to Duplantier, Hrappman, Hogan & Maher for $360,000.

The auditing contract, known as a professional services agreement, is the only one the City Council scores and decides on its own. All other contracts are selected by the administration and approved by the council.

The special meeting will start at 5 p.m. in the City Council chambers at 1801 Williams Blvd.

Follow Chad Calder on Twitter, @Chad_Calder.