THIS CASE INVOLVES CLEANUP, BY TIME CRITICAL REMOVAL ACTION, OF PCB, PAH, AND CHROMIUM CONTAMINATION AT THE WELDA COMPRESSOR STATION. THE WELDA COMPRESSOR STATION, LOCATED NEAR WELDA, KS, IS PART OF A MAIN-LINE NATURAL GAS TRANSMISSION SYSTEM OWNED AND OPERATED BY WILLIAMS NATURAL GAS CO. COMPRESSED AIR IS USED TO START THE NATURAL GAS COMPRESSORS USED TO MOVE THE NATURAL GAS THROUGH THE TRANSMISSION LINES. LUBRICANTS CONTAINING PCBS CONTAMINATED CONDENSATES WHICH FORM IN THE AIR COMPRESSOR SYSTEM. PCBS WERE RELEASED TO THE ENVIRONMENT ALONG WITH THESE CONDENSATES. THE WELDA STATION WAS ONE OF SEVERAL COMPRESSOR STATIONS FOR WHICH WILLIAMS PREVIOUSLY CONDUCTED SITE INVESTIGATIONS PURSUANT TO AN ADMINISTRATIVE CONSENT ORDER. WE ANTICIPATE NEGOTIATING A FOLLOW-UP CONSENT ORDER CALLING FOR WILLIAMS TO CONDUCT THE REMOVAL ACTION DETERMINED TO BE NECESSARY AS A RESULT OF THE INFORMATION OBTAINED IN THIS SITE INVESTIGATION.