southern trails receives final approval ferc approves questar pipeline ferc given final approval questar 155 million pipeline project transport natural gas southern california four corners area borders new mexico arizona utah colorado ruling came commission satisfied questar southern trails pipeline project would harm environment project consist 693 miles crude oil pipeline bought questar 1998 arco pipeline converted natural gas several new compressors built pipeline would divided east zone west zone east zone begin san juan basin new mexico end california border carry 88 mmcf per day west zone within california capacity 120 mmcf per day