415 ILCS 5/22.27: Alternative Daily Cover for Sanitary Landfills.

(a) If the Agency determines that any or all chemical foams provides a cover material that is as good as, or better than, the traditional soil cover commonly used in this State, the Agency shall certify that material as meeting the requirements of this Section. If the Agency determines that any alternative materials other than chemical foams adequately satisfies daily cover requirements at sanitary landfills, it shall permit use of such materials at such facilities.

(b) In complying with the daily cover requirements imposed on sanitary landfills by Board regulation, the operator of a sanitary landfill may use any foam that has been certified by the Agency under this Section in place of a soil cover.