Rules for Library Media Programs are part of the Public School Evaluation, Recognition, and Supervision rules— http://www.isbe.net/rules/archive/pdfs/oneark.pdf --and those rules start on pdf page numbered 87.
Along with the rules is a Probe Document to be used for the 2014-2015 school year. That can be found on the Public School Recognition Division page in Word format.
The section on library media programs begins on page 28.
Along with the Probe Document there is a School Evaluation Form Reference Guide for 2014-2015 school year with the section on school library media programs beginning on pdf page 70. Also, on pdf page 88 is a statement in regards to the requirement for high school library media programs.