THIS ORDER REQUIRES THE RESPONDENTS TO CONDUCT REMOVEAL ACT- IONS TO ABATE AN IMMINENT AND SUBSTANTIAL ENDANGERMENT TO THE PUBLIC HEALTH, WELFARE OR THE ENVIRONMENT THAT MAY BE PRESENTE BY THE ACTUAL OR THREATENED RELEASE OF HAZARDOUS SUBSTANCES AT OR FROM THE SITE. RESPONDENTS SHALL PAY ALL PAST RESPONSE COSTS AND OVERSIGHT COSTS OF THE UNITED STATES RELATED TO THE SITE THAT ARE NOT INCONSISTENT WITH THE NCP. AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS ORDER, U.S. EPA WILL SEND RESPONDENTS A BILL FOR PAST RESPONSE COSTS ARE ALL COSTS, INCLUDING, BUT NOT LIMITED TO DIRECT AND INDIRECT COST SUMMARY. PAST RESPONSE COSTS ARE ALL COSTS, INCLUDING, BUT NOT LIMITED TO, DIRECT AND INDI- RECT COSTS AND INTEREST, THAT THE UNITED STATES, ITS EMPLOY- EES, AGENTS, CONTRACTORS, CONSULTANTS, AND OTHER AUTHORIZED REPRESENTATIVES INCURRED AND PAID WITH REGARD TO THE SITE PRIOR TO THE DATE THROUGH WHICH THE ITEMIZED COST SUMMARY RUNS. IN THE EVENT THAT ANY PAYMENT IS NOT MADE WITHIN THE DEADLINES, RESPONDENTS SHALL PAY INTEREST ON THE UNPAID BALANCE.