WITHIN 30 DAYS AFTER THE EFFECTIVE DATE OF THIS ORDER, HIGH PLAINS SHALL RENDER THE TWO COMPRESSOR ENGINES AT THE NIOBRARA COMPRESSOR STATION PERMANENTLY INOPERABLE BY REMOVING THE IGNITIONS FROM THE TWO ENGINES AND DISCONNECT- ING THE ENGINES FROM THE NATURAL GAS FUEL SUPPLY. WITHIN 20 DAYS OF THE EFFECTIVE DATTE OF THIS ORDER, COLORADO INTERSTATE GAS SHALL MODIFY ITS PENDING SYNTHETIC MINOR PERMIT APPLICATION TO INCLUDE THE PROPER INSTALLATION AND OPERATION OF AN AFTER-COOLER ON THE NIOBRARA COMPRESSOR ENGINE AS A PERMIT CONDITION. CIG SHALL ENTER INTO A CONTRACT TO PURCHASE THE AFTER-COOLERS AND FORWARD A COPY OF THE CONTRACT TO EPA.