Ill. Admin. Code tit. 35, § 845.990
b) The issuing institution must be an entity that has the authority to issue letters of credit and:
c) Forms
e) Conditions on Which the Agency Must Draw on the Letter of Credit
2) The Agency must draw on the letter of credit if the owner or operator:
F) Fails to, within 90 days after receipt by both the owner or operator and the Agency of a notice from the surety that the bond will not be renewed for another term:
f) Amount
g) Term
3) The Agency must return the letter of credit to the issuing institution for termination when either of the following occurs:
h) Cure of Default and Refunds