GROVE CITY — The Midwestern Intermediate Unit IV board accepted the resignation Wednesday night of its executive director, who the board says had unauthorized credit card charges.

The board has ordered a forensic audit of credit card charges made by Cecelia H. Yauger, said Joe Boltz, the Karns City School District representative to the MIU IV, and a member of the board. Yauger had been placed on administrative leave with pay March 27.

“Whatever figure I give you is going to be wrong,” Boltz said this morning, declining to share the estimated amount of money involved that the board was told Wednesday from its solicitor, Timothy McNickle, in an executive session.

The executive session followed the MIU IV’s annual meeting, which includes the election of 13 board members from 27 school districts in Butler, Lawrence and Mercer counties for three-year terms.

Angelo Pezzuolo of New Castle was appointed as interim executive director during the search for a new one, Boltz said. Pezzuolo was the executive director of the agency from 1992 to 2007, when Yauger was hired.

MIU IV is based in Grove City, where Yauger lives.

At its March 20 meeting, the board hired attorney Paul Lalley of Campbell Durrant Beatty Palombo & Miller of Pittsburgh to represent it in case it needed to judge the evidence against Yauger, Boltz said. Now that she has resigned, no hearing will be held.

McNickel, who has been investigating Yauger’s credit card use, will contact legal authorities in Mercer County, Boltz said.

“This is an ongoing investigation,” Boltz said.

McNickel is leading the MIU IV’s investigation, according to Boltz.

The MIU IV had no statement this morning. It is one of 29 regional agencies under the state Department of Education to provide programming and services to school districts.

In Butler County, Butler, Karns City, Mars, Moniteau, Seneca Valley, Slippery Rock and South Butler school districts and the Butler Area Vocational-Technical School are covered by the MIU IV.

School districts contribute to and approve only the MIU IV’s general operating budget. In 2012-13, their contribution was $649,135, or 17 percent of the $3.9 million general operating budget. Fees, grants, interest income and savings made up the balance.

In addition, the MIU IV has 59 other budgets that total more than $100 million for local, regional and statewide programs and services, some of which are state and federally funded.