The Nebraska Environmental Trust Fund is created. The fund shall be maintained in the state accounting system as a cash fund. Except as otherwise provided in this section, the fund shall be used to carry out the purposes of the Nebraska Environmental Trust Act, including the payment of administrative costs. Money in the fund shall include proceeds credited pursuant to section 9-812 and proceeds designated by the board pursuant to section 81-15,173. 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.