The Environmental Infrastructure Sustainability Fund is created. The fund shall be administered by the department. Revenue from the following sources shall be credited to the fund: (1) Application fees collected under section 81-1519 ; (2) reimbursements for actual costs necessary to complete environmental infrastructure sustainability evaluations as authorized under section 81-1517 ; (3) supplemental environmental projects resulting from enforcement settlements; and (4) gifts, grants, reimbursements, or appropriations from any source intended to be used for purposes of section 81-1517. The fund shall be used by the department to offset costs related to the completion of environmental infrastructure sustainability evaluations as authorized by section 81-1517. Any money in the fund available for investment shall be invested by the state investment officer pursuant to the Nebraska Capital Expansion Act and the Nebraska State Funds Investment Act.