The public entity or any national bank, state bank, trust company, or savings and loan association located in this state and designated by mutual agreement of the public entity and the contractor to serve as custodian for the acceptable securities pursuant to section 24-91-106 shall collect all interest and income when due on the acceptable securities so deposited and shall pay them, when and as collected, to the contractor who deposited the acceptable securities. If the deposit is in the form of coupon bonds, the escrow agent shall deliver each coupon, as it matures, to the contractor. Any expense incurred for this service shall not be charged to the public entity.
C.R.S. § 24-91-107