Mr. Hanretty resigned as superintendent in January, and faces three felony counts that include misappropriation of public funds stemming from his employment in the Woodside School District.
The school board on May 9 voted unanimously to send pink slips to the 13 aides, whose combined hours are the equivalent of almost seven full-time positions.
Interim Superintendent Carol Piraino, who recommended the action, and school board President Scott Parker did not return numerous phone calls seeking comment.
The board's action doesn't necessarily mean the layoffs will occur, but the district is required by law to send pink slips to employees by May if it does in fact lay them off at the end of the school year. School districts across the state have sent pink slips to employees by the legal deadline to allow for the option of layoffs as they face tough challenges figuring out ways to balance their budgets.
In the Portola Valley district's case, a projected budget deficit the school board had been working to address for the 2012-13 school year unexpectedly grew by at least $418,000 when auditors late last month found evidence of possible misappropriation of funds from the time Mr. Hanretty served as superintendent.
The auditors, a financial adviser from the San Mateo County Office of Education, and district interim financial officer Mark Bonnett continue to work on sorting through the district's finances, including the effects of Mr. Hanretty's underestimation of employee-benefit costs in the current budget.
The board will hear updates by the investigators at its Wednesday, May 16, meeting, which begins at 4 p.m. with a closed session and continues at 5 p.m. in open session. The meeting will be in the district office annex building at 4575 Alpine Road in Portola Valley.