(a) Federal and non-Federal funds; administrative costs In the case of any designated processing site for which an agreement is executed with any State for remedial action at such site, the Secretary shall pay 90 per centum of the actual cost of such remedial action, including the actual costs of acquiring such site (and any interest therein) or any disposition site (and any interest therein) pursuant to section 7913 of this title , and the State shall pay the remainder of such costs from non-Federal funds. The Secretary shall not pay the administrative costs incurred by any State to develop, prepare, and carry out any cooperative agreement executed with such State under this subchapter, except the proportionate share of the administrative costs associated with the acquisition of lands and interests therein acquired by the State pursuant to this subchapter. (b) Indian land processing sites In the case of any designated processing site located on Indian lands, the Secretary shall pay the entire cost of such remedial action. ( Pub. L. 95–604, title I, § 107 , Nov. 8, 1978 , 92 Stat. 3029 .)