The proceeds from the sale of any bonds issued under authority of the County Pollution Control Revenue Bond Act shall be applied only for the purpose for which the bonds were issued; provided, that any accrued interest and premiums received in any such sale shall be applied to the payment of the principal of or the interest on the bonds sold; and provided further, that if for any reason any portion of such proceeds shall not be needed for the purpose for which the bonds were issued, then such balance of said proceeds shall be applied to the payment of the principal of or the redemption premium, if any, and interest on said bonds, and provided further, that any portion of the proceeds from the sale of said bonds, including refunding bonds, or any accrued interest and premium received in any such sale, may, in the event the money currently will not be needed or cannot be effectively used to the advantage of the county for the purposes herein provided, be invested, in accordance with the procedures and subject to any restrictions established by the resolution and other proceedings under which the bonds are issued, in any securities without limitation except as expressly provided to the contrary in Section 8 [4-60-8 NMSA 1978] of the County Pollution Control Revenue Bond Act, if such investment will not interfere with the use of such funds for the primary purposes as herein provided. The cost of acquiring any project or projects shall be deemed to include the following:
NMS § 4-60-9