THIS AGREEMENT IS FOR RECOVERY OF PAST RESPONSE COSTS. WITHIN 30 DAYS OF THIS AGREEMENT, THE SETTLING PARTIES EXCEPT FOR THE COLORADO SCHOOL OF MINES, THE STATE OF COLORADO, AND THE COLORADO SCHOOL OF MINES RESEARCH INSTITUTE, SHALL PAY TO THE EPA HAZARDOUS SUBSTANCE SUPERFUND $480,993.48 IN REIMBURSEMENT OF EPA'S PAST RESPONSE COSTS, PLUS AN ADDITIONAL SUM FOR INTEREST. AS SOON AS REASONABLY PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS AGREEMENT, THE US ON BEHALF OF THE SETTLING FEDERAL AGENCIES, SHALL PAY TO THE EPA HAZARDOUS SUBSTANCES SUPERFUND $390,006.52 IN REIMBURSEMENT OF EPA'S PAST RESPONSE COSTS.